/* ==========================================================================
   AI Robotics Plus — Master Stylesheet
   Premium AI-Powered Robotics Learning Platform (KG3 – Grade 12)
   Version: 1.0.0
   ========================================================================== */

/* ==========================================================================
   TABLE OF CONTENTS
   --------------------------------------------------------------------------
   1.  CSS Custom Properties (Design Tokens)
   2.  Global Reset & Base Styles
   3.  Typography
   4.  Circuit Board Pattern Background
   5.  Navigation Bar (Glassmorphism)
   6.  Hero Section (Animated Gradient)
   7.  Glowing Button Effects
   8.  Pricing Cards
   9.  Login / Enrollment Forms
   10. Student Dashboard
   11. Progress Bars (Linear & Circular)
   12. Course Player
   13. Robot Simulator Canvas
   14. Build Lab Interface
   15. Code Editor Area
   16. Mission Cards
   17. Quiz / Checkpoint UI
   18. Skill Tree Visualization
   19. Modal Dialogs (AI Tutor)
   20. ET+ Robot Avatar
   21. Badge & Certificate Display
   22. Toast Notifications
   23. Loading States & Skeleton Screens
   24. Sidebar Navigation
   25. Data Tables (Sensor Readings)
   26. Parent / Teacher View
   27. Utility Classes
   28. Responsive Breakpoints
   ========================================================================== */


/* ==========================================================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ========================================================================== */

:root {
  /* ---- Core Palette ---- */
  --color-space-black:    #050A14;
  --color-electric-blue:  #00E5FF;
  --color-neon-green:     #00FF88;
  --color-white:          #FFFFFF;
  --color-metallic-grey:  #B0BEC5;
  --color-dark-panel:     #0A1628;
  --color-card-bg:        #111B2E;

  /* ---- Extended Palette ---- */
  --color-blue-dim:       rgba(0, 229, 255, 0.15);
  --color-blue-glow:      rgba(0, 229, 255, 0.35);
  --color-green-dim:      rgba(0, 255, 136, 0.15);
  --color-green-glow:     rgba(0, 255, 136, 0.35);
  --color-danger:         #FF4060;
  --color-warning:        #FFAA00;
  --color-success:        #00FF88;
  --color-info:           #00E5FF;

  /* ---- Text ---- */
  --text-primary:         #FFFFFF;
  --text-secondary:       #B0BEC5;
  --text-muted:           #637789;
  --text-inverse:         #050A14;

  /* ---- Typography ---- */
  --font-primary:         'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont,
                          'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono:            'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono',
                          Consolas, 'Liberation Mono', Menlo, monospace;

  /* ---- Font Sizes (fluid clamp scale) ---- */
  --text-xs:    clamp(0.6875rem, 0.65rem + 0.15vw, 0.75rem);    /* 11–12px */
  --text-sm:    clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);       /* 12–14px */
  --text-base:  clamp(0.875rem, 0.825rem + 0.25vw, 1rem);       /* 14–16px */
  --text-lg:    clamp(1rem, 0.925rem + 0.35vw, 1.125rem);        /* 16–18px */
  --text-xl:    clamp(1.125rem, 1rem + 0.5vw, 1.25rem);          /* 18–20px */
  --text-2xl:   clamp(1.25rem, 1.1rem + 0.65vw, 1.5rem);        /* 20–24px */
  --text-3xl:   clamp(1.5rem, 1.25rem + 1vw, 1.875rem);         /* 24–30px */
  --text-4xl:   clamp(1.875rem, 1.5rem + 1.5vw, 2.25rem);       /* 30–36px */
  --text-5xl:   clamp(2.25rem, 1.75rem + 2vw, 3rem);            /* 36–48px */
  --text-hero:  clamp(2.5rem, 1.8rem + 3vw, 4rem);              /* 40–64px */

  /* ---- Spacing ---- */
  --space-1:   0.25rem;   /* 4px */
  --space-2:   0.5rem;    /* 8px */
  --space-3:   0.75rem;   /* 12px */
  --space-4:   1rem;      /* 16px */
  --space-5:   1.25rem;   /* 20px */
  --space-6:   1.5rem;    /* 24px */
  --space-8:   2rem;      /* 32px */
  --space-10:  2.5rem;    /* 40px */
  --space-12:  3rem;      /* 48px */
  --space-16:  4rem;      /* 64px */
  --space-20:  5rem;      /* 80px */

  /* ---- Border Radius ---- */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* ---- Shadows ---- */
  --shadow-sm:    0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md:    0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg:    0 8px 30px rgba(0, 0, 0, 0.6);
  --shadow-glow-blue:  0 0 20px rgba(0, 229, 255, 0.25), 0 0 60px rgba(0, 229, 255, 0.1);
  --shadow-glow-green: 0 0 20px rgba(0, 255, 136, 0.25), 0 0 60px rgba(0, 255, 136, 0.1);

  /* ---- Transitions ---- */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ---- Z-Index Scale ---- */
  --z-base:      1;
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-overlay:   300;
  --z-modal:     400;
  --z-toast:     500;
  --z-tooltip:   600;

  /* ---- Layout ---- */
  --sidebar-width:           280px;
  --sidebar-collapsed-width: 64px;
  --navbar-height:           64px;
  --content-max-width:       1280px;
}


/* ==========================================================================
   2. GLOBAL RESET & BASE STYLES
   ========================================================================== */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 100%;                  /* 16px base */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  height: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--color-space-black);
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: var(--color-electric-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-neon-green);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-electric-blue);
  outline-offset: 2px;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Selection styling */
::selection {
  background: var(--color-blue-glow);
  color: var(--color-white);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-dark-panel);
}

::-webkit-scrollbar-thumb {
  background: var(--color-metallic-grey);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-electric-blue);
}


/* ==========================================================================
   3. TYPOGRAPHY
   ========================================================================== */

.text-xs    { font-size: var(--text-xs); }
.text-sm    { font-size: var(--text-sm); }
.text-base  { font-size: var(--text-base); }
.text-lg    { font-size: var(--text-lg); }
.text-xl    { font-size: var(--text-xl); }
.text-2xl   { font-size: var(--text-2xl); }
.text-3xl   { font-size: var(--text-3xl); }
.text-4xl   { font-size: var(--text-4xl); }
.text-5xl   { font-size: var(--text-5xl); }

.font-mono  { font-family: var(--font-mono); }

.text-gradient {
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.heading-glow {
  text-shadow: 0 0 30px var(--color-blue-glow);
}


/* ==========================================================================
   4. CIRCUIT BOARD PATTERN BACKGROUND (CSS-Only)
   ========================================================================== */

.circuit-bg {
  position: relative;
  background-color: var(--color-space-black);
}

.circuit-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.08;
  background-image:
    /* Horizontal traces */
    linear-gradient(
      0deg,
      transparent 49.5%,
      var(--color-electric-blue) 49.5%,
      var(--color-electric-blue) 50.5%,
      transparent 50.5%
    ),
    /* Vertical traces */
    linear-gradient(
      90deg,
      transparent 49.5%,
      var(--color-electric-blue) 49.5%,
      var(--color-electric-blue) 50.5%,
      transparent 50.5%
    ),
    /* Nodes / solder points */
    radial-gradient(
      circle 3px at 50% 50%,
      var(--color-neon-green) 50%,
      transparent 50%
    ),
    /* Diagonal traces */
    linear-gradient(
      45deg,
      transparent 49%,
      var(--color-electric-blue) 49%,
      var(--color-electric-blue) 51%,
      transparent 51%
    );
  background-size:
    80px 80px,
    80px 80px,
    80px 80px,
    40px 40px;
}

/* Lighter grid overlay for specific panels */
.grid-overlay {
  position: relative;
}

.grid-overlay::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}


/* ==========================================================================
   5. NAVIGATION BAR (Glassmorphism)
   ========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  z-index: var(--z-sticky);

  /* Glassmorphism */
  background: rgba(5, 10, 20, 0.72);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-white);
}

.navbar__logo-accent {
  color: var(--color-electric-blue);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.navbar__link {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-electric-blue);
  transition: width var(--transition-base);
}

.navbar__link:hover,
.navbar__link--active {
  color: var(--color-white);
}

.navbar__link:hover::after,
.navbar__link--active::after {
  width: 100%;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile hamburger */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--space-2);
}

.navbar__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Open state */
.navbar__toggle--open .navbar__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle--open .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle--open .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu panel */
.navbar__mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(5, 10, 20, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-8) var(--space-6);
  flex-direction: column;
  gap: var(--space-4);
  z-index: var(--z-overlay);
}

.navbar__mobile-menu--open {
  display: flex;
}


/* ==========================================================================
   6. HERO SECTION (Animated Gradient)
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-20) var(--space-6);
  overflow: hidden;
  text-align: center;
}

/* Animated gradient background */
.hero::before {
  content: '';
  position: absolute;
  inset: -50%;
  z-index: 0;
  background: linear-gradient(
    125deg,
    var(--color-space-black) 0%,
    #081020 20%,
    #0A1830 35%,
    #051828 50%,
    #0A1628 65%,
    #081020 80%,
    var(--color-space-black) 100%
  );
  background-size: 400% 400%;
  animation: hero-gradient 16s ease infinite;
}

@keyframes hero-gradient {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Particle-like radial glows */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 40%, rgba(0, 229, 255, 0.08), transparent),
    radial-gradient(ellipse 500px 300px at 80% 60%, rgba(0, 255, 136, 0.06), transparent),
    radial-gradient(ellipse 300px 300px at 50% 20%, rgba(0, 229, 255, 0.05), transparent);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: var(--z-base);
  max-width: 800px;
}

.hero__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-neon-green);
  padding: var(--space-1) var(--space-4);
  border: 1px solid rgba(0, 255, 136, 0.3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 800;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.hero__cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Floating decorative elements */
.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: orb-float 8s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero__orb--blue {
  width: 400px;
  height: 400px;
  background: rgba(0, 229, 255, 0.12);
  top: 10%;
  left: -5%;
}

.hero__orb--green {
  width: 300px;
  height: 300px;
  background: rgba(0, 255, 136, 0.08);
  bottom: 15%;
  right: -5%;
  animation-delay: -4s;
}

@keyframes orb-float {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -30px) scale(1.1); }
}


/* ==========================================================================
   7. GLOWING BUTTON EFFECTS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition:
    background var(--transition-fast),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: scale(0.97);
}

/* Primary — Electric Blue */
.btn--primary {
  background: var(--color-electric-blue);
  color: var(--color-space-black);
  font-weight: 700;
}

.btn--primary:hover {
  background: #33D4FF;
  box-shadow: var(--shadow-glow-blue);
  color: var(--color-space-black);
}

/* Secondary — Neon Green */
.btn--secondary {
  background: var(--color-neon-green);
  color: var(--color-space-black);
  font-weight: 700;
}

.btn--secondary:hover {
  background: #33FFAA;
  box-shadow: var(--shadow-glow-green);
  color: var(--color-space-black);
}

/* Outline — Blue Border */
.btn--outline {
  background: transparent;
  color: var(--color-electric-blue);
  border: 2px solid var(--color-electric-blue);
}

.btn--outline:hover {
  background: var(--color-blue-dim);
  box-shadow: var(--shadow-glow-blue);
  color: var(--color-electric-blue);
}

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-white);
}

/* Danger */
.btn--danger {
  background: var(--color-danger);
  color: var(--color-white);
}

.btn--danger:hover {
  box-shadow: 0 0 20px rgba(255, 64, 96, 0.3);
}

/* Size variants */
.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* Icon-only */
.btn--icon {
  padding: var(--space-3);
  border-radius: var(--radius-md);
}

/* Disabled */
.btn:disabled,
.btn--disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}


/* ==========================================================================
   8. PRICING CARDS
   ========================================================================== */

.pricing {
  padding: var(--space-20) var(--space-6);
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.pricing-card:hover {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--shadow-glow-blue);
  transform: translateY(-4px);
}

/* Featured / highlighted card */
.pricing-card--featured {
  border-color: var(--color-electric-blue);
  background: linear-gradient(
    180deg,
    rgba(0, 229, 255, 0.06) 0%,
    var(--color-card-bg) 40%
  );
}

.pricing-card--featured:hover {
  box-shadow:
    0 0 30px rgba(0, 229, 255, 0.2),
    0 0 80px rgba(0, 229, 255, 0.08);
}

.pricing-card__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card__tier {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.pricing-card__price {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.pricing-card__price-period {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-card__desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  flex: 1;
}

.pricing-card__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.pricing-card__feature-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--color-neon-green);
}

.pricing-card__feature--disabled {
  color: var(--text-muted);
  text-decoration: line-through;
}


/* ==========================================================================
   9. LOGIN / ENROLLMENT FORMS
   ========================================================================== */

.auth-form {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  padding: var(--space-10);
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-xl);
}

.auth-form__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-2);
}

.auth-form__subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--space-8);
}

/* Form field group */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

/* Neon-bordered inputs */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(176, 190, 197, 0.2);
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-size: var(--text-base);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input:hover {
  border-color: rgba(0, 229, 255, 0.3);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 3px var(--color-blue-dim), 0 0 12px rgba(0, 229, 255, 0.15);
  background: rgba(0, 229, 255, 0.03);
}

/* Error state */
.form-input--error {
  border-color: var(--color-danger);
}

.form-input--error:focus {
  box-shadow: 0 0 0 3px rgba(255, 64, 96, 0.15);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
}

/* Success state */
.form-input--success {
  border-color: var(--color-neon-green);
}

/* Select dropdown */
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23B0BEC5' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-10);
}

/* Checkbox / Toggle */
.form-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--color-electric-blue);
  cursor: pointer;
}

/* Social login divider */
.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
}


/* ==========================================================================
   10. STUDENT DASHBOARD
   ========================================================================== */

.dashboard {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  padding-top: var(--navbar-height);
}

.dashboard__main {
  padding: var(--space-8);
  overflow-y: auto;
}

/* Stats row */
.dashboard__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.stat-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-card__icon--blue  { background: var(--color-blue-dim); color: var(--color-electric-blue); }
.stat-card__icon--green { background: var(--color-green-dim); color: var(--color-neon-green); }

.stat-card__value {
  font-size: var(--text-2xl);
  font-weight: 700;
}

.stat-card__label {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* Course progress grid */
.dashboard__courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.progress-card {
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.progress-card:hover {
  border-color: rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
}

.progress-card__thumb {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background: var(--color-dark-panel);
}

.progress-card__body {
  padding: var(--space-4);
}

.progress-card__title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.progress-card__meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

/* Skill meters */
.skill-meter {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.skill-meter__label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  min-width: 80px;
}

.skill-meter__bar {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-meter__fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-neon-green));
  transition: width var(--transition-slow);
}

.skill-meter__value {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-electric-blue);
  min-width: 36px;
  text-align: right;
}


/* ==========================================================================
   11. PROGRESS BARS (Linear & Circular)
   ========================================================================== */

/* ---- Linear ---- */
.progress-linear {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-linear__fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-neon-green));
  transition: width 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

.progress-linear--sm { height: 4px; }
.progress-linear--lg { height: 12px; }

/* Animated shimmer */
.progress-linear--animated .progress-linear__fill {
  position: relative;
  overflow: hidden;
}

.progress-linear--animated .progress-linear__fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ---- Circular ---- */
.progress-circle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.progress-circle svg {
  transform: rotate(-90deg);
}

.progress-circle__track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.06);
}

.progress-circle__fill {
  fill: none;
  stroke: var(--color-electric-blue);
  stroke-linecap: round;
  transition: stroke-dashoffset 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

.progress-circle__label {
  position: absolute;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-white);
}


/* ==========================================================================
   12. COURSE PLAYER
   ========================================================================== */

.player {
  display: grid;
  grid-template-columns: 320px 1fr 360px;
  height: calc(100vh - var(--navbar-height));
  margin-top: var(--navbar-height);
}

/* ---- Sidebar Lesson Tree ---- */
.player__sidebar {
  background: var(--color-dark-panel);
  border-right: 1px solid rgba(0, 229, 255, 0.08);
  overflow-y: auto;
  padding: var(--space-4) 0;
}

.player__module {
  margin-bottom: var(--space-2);
}

.player__module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.player__module-header:hover {
  color: var(--color-white);
}

.player__lesson {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-8);
  font-size: var(--text-sm);
  color: var(--text-muted);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.player__lesson:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
}

.player__lesson--active {
  background: rgba(0, 229, 255, 0.06);
  color: var(--color-white);
  border-left-color: var(--color-electric-blue);
}

.player__lesson--completed {
  color: var(--color-neon-green);
}

.player__lesson-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.player__lesson-duration {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ---- Main Content Area ---- */
.player__content {
  background: var(--color-space-black);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.player__video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.player__video-wrapper video,
.player__video-wrapper iframe {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.player__text-content {
  padding: var(--space-8);
  max-width: 800px;
}

/* ---- Floating AI Panel ---- */
.player__ai-panel {
  background: var(--color-dark-panel);
  border-left: 1px solid rgba(0, 229, 255, 0.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.player__ai-header {
  padding: var(--space-4);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.player__ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.player__ai-input {
  padding: var(--space-4);
  border-top: 1px solid rgba(0, 229, 255, 0.08);
  display: flex;
  gap: var(--space-2);
}

.player__ai-input .form-input {
  flex: 1;
}


/* ==========================================================================
   13. ROBOT SIMULATOR CANVAS
   ========================================================================== */

.simulator {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 500px;
  background: var(--color-space-black);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Technical grid overlay */
.simulator::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Coordinate axis indicators */
.simulator::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.3), transparent);
  z-index: 1;
}

.simulator__canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.simulator__controls {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  gap: var(--space-2);
  padding: var(--space-2);
  background: rgba(10, 22, 40, 0.9);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.simulator__status {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 2;
  padding: var(--space-2) var(--space-4);
  background: rgba(10, 22, 40, 0.9);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-neon-green);
}


/* ==========================================================================
   14. BUILD LAB INTERFACE
   ========================================================================== */

.build-lab {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: calc(100vh - var(--navbar-height));
  margin-top: var(--navbar-height);
  background: var(--color-space-black);
}

/* Component palette sidebar */
.build-lab__palette {
  background: var(--color-dark-panel);
  border-right: 1px solid rgba(0, 229, 255, 0.08);
  overflow-y: auto;
  padding: var(--space-4);
}

.build-lab__palette-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.build-lab__component {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: grab;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.build-lab__component:hover {
  border-color: var(--color-electric-blue);
  background: rgba(0, 229, 255, 0.04);
}

.build-lab__component:active {
  cursor: grabbing;
}

.build-lab__component-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-blue-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.build-lab__component-name {
  font-size: var(--text-sm);
  font-weight: 500;
}

.build-lab__component-desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Workspace */
.build-lab__workspace {
  position: relative;
  overflow: auto;
}

.build-lab__workspace-grid {
  width: 100%;
  height: 100%;
  min-width: 1200px;
  min-height: 800px;
  background-image:
    radial-gradient(circle 1px, rgba(0, 229, 255, 0.08) 1px, transparent 1px);
  background-size: 20px 20px;
}


/* ==========================================================================
   15. CODE EDITOR AREA (Dark Theme)
   ========================================================================== */

.code-editor {
  display: flex;
  flex-direction: column;
  background: #1E1E1E;                /* VS Code dark bg */
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-mono);
}

.code-editor__tabs {
  display: flex;
  background: #252526;                /* VS Code tab bar */
  border-bottom: 1px solid #1E1E1E;
  overflow-x: auto;
}

.code-editor__tab {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  color: #969696;
  border-right: 1px solid #1E1E1E;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.code-editor__tab:hover {
  background: #2D2D2D;
}

.code-editor__tab--active {
  background: #1E1E1E;
  color: var(--color-white);
  border-bottom: 2px solid var(--color-electric-blue);
}

.code-editor__body {
  display: flex;
  flex: 1;
  min-height: 300px;
}

/* Line numbers gutter */
.code-editor__gutter {
  padding: var(--space-4) var(--space-3);
  text-align: right;
  color: #5A5A5A;
  font-size: var(--text-xs);
  line-height: 1.6;
  user-select: none;
  background: #1E1E1E;
  border-right: 1px solid #2D2D2D;
  min-width: 48px;
}

.code-editor__content {
  flex: 1;
  padding: var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: #D4D4D4;                    /* VS Code foreground */
  overflow: auto;
  white-space: pre;
  tab-size: 4;
}

/* Syntax highlight tokens */
.code-editor__content .token-keyword  { color: #569CD6; }
.code-editor__content .token-string   { color: #CE9178; }
.code-editor__content .token-number   { color: #B5CEA8; }
.code-editor__content .token-comment  { color: #6A9955; font-style: italic; }
.code-editor__content .token-function { color: #DCDCAA; }
.code-editor__content .token-type     { color: #4EC9B0; }
.code-editor__content .token-variable { color: #9CDCFE; }
.code-editor__content .token-operator { color: #D4D4D4; }

/* Toolbar */
.code-editor__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: #252526;
  border-top: 1px solid #1E1E1E;
}

/* Output / console pane */
.code-editor__output {
  background: #1A1A1A;
  border-top: 1px solid #2D2D2D;
  padding: var(--space-4);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: #CCCCCC;
  max-height: 200px;
  overflow-y: auto;
}

.code-editor__output-success { color: var(--color-neon-green); }
.code-editor__output-error   { color: var(--color-danger); }
.code-editor__output-warn    { color: var(--color-warning); }


/* ==========================================================================
   16. MISSION CARDS
   ========================================================================== */

.mission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.mission-card {
  position: relative;
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.mission-card:hover {
  border-color: rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
}

.mission-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.mission-card__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Difficulty badges */
.difficulty-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
}

.difficulty-badge--beginner {
  background: rgba(0, 255, 136, 0.12);
  color: var(--color-neon-green);
  border: 1px solid rgba(0, 255, 136, 0.25);
}

.difficulty-badge--intermediate {
  background: rgba(0, 229, 255, 0.12);
  color: var(--color-electric-blue);
  border: 1px solid rgba(0, 229, 255, 0.25);
}

.difficulty-badge--advanced {
  background: rgba(255, 170, 0, 0.12);
  color: var(--color-warning);
  border: 1px solid rgba(255, 170, 0, 0.25);
}

.difficulty-badge--expert {
  background: rgba(255, 64, 96, 0.12);
  color: var(--color-danger);
  border: 1px solid rgba(255, 64, 96, 0.25);
}

.mission-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.mission-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.mission-card__progress {
  margin-bottom: var(--space-3);
}

.mission-card__progress-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.mission-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.mission-card__xp {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-neon-green);
}

/* Locked state */
.mission-card--locked {
  opacity: 0.5;
  pointer-events: none;
}

.mission-card--locked::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(5, 10, 20, 0.6);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}


/* ==========================================================================
   17. QUIZ / CHECKPOINT UI
   ========================================================================== */

.quiz {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-8);
}

.quiz__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.quiz__progress-info {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.quiz__timer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-electric-blue);
}

.quiz__timer--warning {
  color: var(--color-warning);
  animation: pulse-color 1s ease-in-out infinite;
}

@keyframes pulse-color {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

.quiz__question {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-6);
  line-height: 1.4;
}

/* Answer cards */
.quiz__answers {
  display: grid;
  gap: var(--space-3);
}

.answer-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-card-bg);
  border: 2px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    box-shadow var(--transition-fast);
}

.answer-card:hover {
  border-color: rgba(0, 229, 255, 0.25);
  background: rgba(0, 229, 255, 0.04);
}

.answer-card--selected {
  border-color: var(--color-electric-blue);
  background: var(--color-blue-dim);
  box-shadow: 0 0 0 1px var(--color-electric-blue);
}

.answer-card--correct {
  border-color: var(--color-neon-green);
  background: var(--color-green-dim);
}

.answer-card--incorrect {
  border-color: var(--color-danger);
  background: rgba(255, 64, 96, 0.08);
}

.answer-card__letter {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
  flex-shrink: 0;
}

.answer-card--selected .answer-card__letter {
  background: var(--color-electric-blue);
  color: var(--color-space-black);
}

.answer-card--correct .answer-card__letter {
  background: var(--color-neon-green);
  color: var(--color-space-black);
}

.answer-card--incorrect .answer-card__letter {
  background: var(--color-danger);
  color: var(--color-white);
}

.answer-card__text {
  font-size: var(--text-base);
}

/* Quiz navigation */
.quiz__nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-8);
}

/* Results */
.quiz__result {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.quiz__result-score {
  font-size: var(--text-5xl);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.quiz__result-label {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}


/* ==========================================================================
   18. SKILL TREE VISUALIZATION
   ========================================================================== */

.skill-tree {
  position: relative;
  padding: var(--space-8);
  overflow: auto;
  min-height: 500px;
}

/* Connecting lines rendered via pseudo-elements or SVG; these are the nodes */
.skill-node {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.skill-node__circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-card-bg);
  border: 3px solid rgba(0, 229, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.skill-node__circle:hover {
  transform: scale(1.1);
}

.skill-node--unlocked .skill-node__circle {
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.2);
}

.skill-node--completed .skill-node__circle {
  border-color: var(--color-neon-green);
  background: var(--color-green-dim);
  box-shadow: var(--shadow-glow-green);
}

.skill-node--locked .skill-node__circle {
  border-color: rgba(255, 255, 255, 0.06);
  opacity: 0.4;
  cursor: not-allowed;
}

.skill-node__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  max-width: 80px;
}

.skill-node--completed .skill-node__label {
  color: var(--color-neon-green);
}

/* Connection lines via SVG overlay */
.skill-tree__connections {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.skill-tree__line {
  stroke: rgba(0, 229, 255, 0.15);
  stroke-width: 2;
  fill: none;
}

.skill-tree__line--active {
  stroke: var(--color-electric-blue);
  filter: drop-shadow(0 0 4px rgba(0, 229, 255, 0.3));
}

.skill-tree__line--completed {
  stroke: var(--color-neon-green);
  filter: drop-shadow(0 0 4px rgba(0, 255, 136, 0.3));
}


/* ==========================================================================
   19. MODAL DIALOGS (AI Tutor Responses)
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: rgba(5, 10, 20, 0.8);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay--open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: 85vh;
  background: var(--color-dark-panel);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), var(--shadow-glow-blue);
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-spring);
  overflow: hidden;
}

.modal-overlay--open .modal {
  transform: scale(1) translateY(0);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
}

.modal__title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.modal__close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.modal__close:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-white);
}

.modal__body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid rgba(0, 229, 255, 0.08);
}

/* AI tutor specific modal content */
.ai-response {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-secondary);
}

.ai-response code {
  background: rgba(0, 229, 255, 0.08);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--color-electric-blue);
}

.ai-response pre {
  background: #1E1E1E;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-4) 0;
}

.ai-response pre code {
  background: none;
  padding: 0;
  color: #D4D4D4;
}


/* ==========================================================================
   20. ET+ ROBOT AVATAR
   ========================================================================== */

.robot-avatar {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.robot-avatar__container {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.robot-avatar__container--sm { width: 40px; height: 40px; }
.robot-avatar__container--lg { width: 96px; height: 96px; }
.robot-avatar__container--xl { width: 128px; height: 128px; }

.robot-avatar__image {
  width: 80%;
  height: 80%;
  object-fit: contain;
}

/* Glow ring */
.robot-avatar__glow {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(0, 229, 255, 0.3);
  animation: avatar-glow-pulse 3s ease-in-out infinite;
}

@keyframes avatar-glow-pulse {
  0%, 100% { border-color: rgba(0, 229, 255, 0.3); box-shadow: 0 0 8px rgba(0, 229, 255, 0.1); }
  50%      { border-color: rgba(0, 229, 255, 0.6); box-shadow: 0 0 20px rgba(0, 229, 255, 0.2); }
}

/* ---- Idle Bobbing ---- */
.robot-avatar--idle .robot-avatar__container {
  animation: robot-idle-bob 3s ease-in-out infinite;
}

@keyframes robot-idle-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

/* ---- Speaking Pulse ---- */
.robot-avatar--speaking .robot-avatar__container {
  animation: robot-speak-pulse 0.6s ease-in-out infinite;
}

@keyframes robot-speak-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}

.robot-avatar--speaking .robot-avatar__glow {
  animation: robot-speak-glow 0.6s ease-in-out infinite;
}

@keyframes robot-speak-glow {
  0%, 100% { box-shadow: 0 0 8px rgba(0, 229, 255, 0.2); }
  50%      { box-shadow: 0 0 24px rgba(0, 229, 255, 0.4); }
}

/* ---- Celebration Bounce ---- */
.robot-avatar--celebrating .robot-avatar__container {
  animation: robot-celebrate 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes robot-celebrate {
  0%   { transform: translateY(0) scale(1) rotate(0deg); }
  25%  { transform: translateY(-20px) scale(1.1) rotate(-5deg); }
  50%  { transform: translateY(-8px) scale(1.05) rotate(3deg); }
  75%  { transform: translateY(-14px) scale(1.08) rotate(-2deg); }
  100% { transform: translateY(0) scale(1) rotate(0deg); }
}

/* ---- Thinking ---- */
.robot-avatar--thinking .robot-avatar__container {
  animation: robot-thinking 2s linear infinite;
}

@keyframes robot-thinking {
  0%   { transform: rotate(0deg); }
  10%  { transform: rotate(5deg); }
  20%  { transform: rotate(-5deg); }
  30%  { transform: rotate(3deg); }
  40%  { transform: rotate(-3deg); }
  50%, 100% { transform: rotate(0deg); }
}

/* Status indicator dot */
.robot-avatar__status {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--color-dark-panel);
}

.robot-avatar__status--online  { background: var(--color-neon-green); }
.robot-avatar__status--busy    { background: var(--color-warning); }
.robot-avatar__status--offline { background: var(--text-muted); }


/* ==========================================================================
   21. BADGE & CERTIFICATE DISPLAY
   ========================================================================== */

.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-4);
}

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.06);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.badge-item:hover {
  border-color: rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
}

.badge-item__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-blue-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.badge-item--earned .badge-item__icon {
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  box-shadow: var(--shadow-glow-blue);
}

.badge-item--locked .badge-item__icon {
  opacity: 0.3;
  filter: grayscale(1);
}

.badge-item__name {
  font-size: var(--text-xs);
  font-weight: 600;
}

.badge-item__date {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Certificate card */
.certificate-card {
  position: relative;
  background: var(--color-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-5);
  align-items: center;
  transition: border-color var(--transition-base);
}

.certificate-card:hover {
  border-color: rgba(0, 229, 255, 0.2);
}

.certificate-card__preview {
  width: 120px;
  height: 85px;
  background: linear-gradient(135deg, #0A1628, #111B2E);
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.certificate-card__details {
  flex: 1;
}

.certificate-card__title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.certificate-card__meta {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.certificate-card__actions {
  display: flex;
  gap: var(--space-2);
}


/* ==========================================================================
   22. TOAST NOTIFICATIONS
   ========================================================================== */

.toast-container {
  position: fixed;
  top: calc(var(--navbar-height) + var(--space-4));
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 400px;
  width: 100%;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-dark-panel);
  border: 1px solid rgba(0, 229, 255, 0.12);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  animation: toast-enter 400ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.toast--exiting {
  animation: toast-exit 300ms ease forwards;
}

@keyframes toast-enter {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toast-exit {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(100%) scale(0.9);
  }
}

.toast__icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast--success { border-left: 3px solid var(--color-neon-green); }
.toast--success .toast__icon { color: var(--color-neon-green); }

.toast--error { border-left: 3px solid var(--color-danger); }
.toast--error .toast__icon { color: var(--color-danger); }

.toast--warning { border-left: 3px solid var(--color-warning); }
.toast--warning .toast__icon { color: var(--color-warning); }

.toast--info { border-left: 3px solid var(--color-electric-blue); }
.toast--info .toast__icon { color: var(--color-electric-blue); }

.toast__content {
  flex: 1;
}

.toast__title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 2px;
}

.toast__message {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.toast__close {
  width: 24px;
  height: 24px;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.toast__close:hover {
  color: var(--color-white);
}

/* Auto-dismiss progress bar */
.toast__progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--color-electric-blue);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  animation: toast-progress 5s linear forwards;
}

@keyframes toast-progress {
  from { width: 100%; }
  to   { width: 0%; }
}


/* ==========================================================================
   23. LOADING STATES & SKELETON SCREENS
   ========================================================================== */

/* Spinner */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(0, 229, 255, 0.15);
  border-top-color: var(--color-electric-blue);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}

.spinner--sm { width: 18px; height: 18px; border-width: 2px; }
.spinner--lg { width: 48px; height: 48px; border-width: 4px; }

@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

/* Full-page loader */
.loader-fullscreen {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: var(--color-space-black);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.loader-fullscreen__text {
  font-size: var(--text-sm);
  color: var(--text-muted);
  animation: pulse-color 2s ease-in-out infinite;
}

/* Skeleton */
.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04) 25%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.04) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton--text       { height: 16px; width: 100%; margin-bottom: var(--space-2); }
.skeleton--text-sm    { height: 12px; width: 60%; }
.skeleton--heading    { height: 28px; width: 70%; margin-bottom: var(--space-4); }
.skeleton--avatar     { width: 48px; height: 48px; border-radius: 50%; }
.skeleton--thumbnail  { width: 100%; height: 160px; border-radius: var(--radius-lg); }
.skeleton--button     { width: 120px; height: 40px; border-radius: var(--radius-md); }
.skeleton--card {
  width: 100%;
  height: 280px;
  border-radius: var(--radius-lg);
}

/* Skeleton card composite */
.skeleton-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border: 1px solid rgba(0, 229, 255, 0.04);
}


/* ==========================================================================
   24. SIDEBAR NAVIGATION (Collapsible)
   ========================================================================== */

.sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-dark-panel);
  border-right: 1px solid rgba(0, 229, 255, 0.08);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: width var(--transition-base);
  overflow: hidden;
}

.sidebar--collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar__header {
  padding: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0, 229, 255, 0.06);
}

.sidebar__toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar__toggle:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-white);
}

.sidebar__nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) 0;
}

/* Section grouping */
.sidebar__section {
  margin-bottom: var(--space-2);
}

.sidebar__section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--space-3) var(--space-4);
}

.sidebar--collapsed .sidebar__section-title {
  display: none;
}

/* Nav items */
.sidebar__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  border-left: 3px solid transparent;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.sidebar__item:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-white);
}

.sidebar__item--active {
  background: rgba(0, 229, 255, 0.06);
  color: var(--color-white);
  border-left-color: var(--color-electric-blue);
}

.sidebar__item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar--collapsed .sidebar__item-label {
  display: none;
}

/* Collapsible subsection */
.sidebar__submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.sidebar__submenu--open {
  max-height: 500px;
}

.sidebar__subitem {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-10);
  font-size: var(--text-xs);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.sidebar__subitem:hover {
  color: var(--color-electric-blue);
}

.sidebar__subitem--active {
  color: var(--color-electric-blue);
}

/* Badge for notification counts */
.sidebar__badge {
  margin-left: auto;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: var(--radius-full);
  background: var(--color-electric-blue);
  color: var(--color-space-black);
  font-size: 10px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Footer */
.sidebar__footer {
  padding: var(--space-4);
  border-top: 1px solid rgba(0, 229, 255, 0.06);
}


/* ==========================================================================
   25. DATA TABLES (Sensor Readings)
   ========================================================================== */

.data-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid rgba(0, 229, 255, 0.08);
  border-radius: var(--radius-lg);
  background: var(--color-card-bg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table thead {
  background: var(--color-dark-panel);
}

.data-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
  white-space: nowrap;
}

.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: rgba(0, 229, 255, 0.03);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* Monospace values for sensor readings */
.data-table__mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-electric-blue);
}

/* Status indicators */
.data-table__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
}

.data-table__status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.data-table__status--online::before  { background: var(--color-neon-green); }
.data-table__status--warning::before { background: var(--color-warning); }
.data-table__status--error::before   { background: var(--color-danger); }
.data-table__status--offline::before { background: var(--text-muted); }

/* Sortable header */
.data-table__sortable {
  cursor: pointer;
  user-select: none;
}

.data-table__sortable:hover {
  color: var(--color-electric-blue);
}

/* Pagination */
.data-table__pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-muted);
  border-top: 1px solid rgba(0, 229, 255, 0.08);
}

.data-table__page-btns {
  display: flex;
  gap: var(--space-1);
}

.data-table__page-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.data-table__page-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-white);
}

.data-table__page-btn--active {
  background: var(--color-electric-blue);
  color: var(--color-space-black);
}


/* ==========================================================================
   26. PARENT / TEACHER VIEW (Muted Color Scheme)
   ========================================================================== */

.parent-view {
  --pv-bg:        #F4F6F8;
  --pv-surface:   #FFFFFF;
  --pv-border:    #DDE3EA;
  --pv-text:      #2D3748;
  --pv-text-sec:  #718096;
  --pv-text-mut:  #A0AEC0;
  --pv-accent:    #3182CE;  /* Softer blue for parent/teacher context */
  --pv-success:   #38A169;
  --pv-warning:   #DD6B20;
  --pv-danger:    #E53E3E;

  background: var(--pv-bg);
  color: var(--pv-text);
  min-height: 100vh;
}

.parent-view .navbar {
  background: var(--pv-surface);
  border-bottom: 1px solid var(--pv-border);
  backdrop-filter: none;
}

.parent-view .navbar__link {
  color: var(--pv-text-sec);
}

.parent-view .navbar__link:hover,
.parent-view .navbar__link--active {
  color: var(--pv-accent);
}

.parent-view .sidebar {
  background: var(--pv-surface);
  border-right: 1px solid var(--pv-border);
}

.parent-view .sidebar__item {
  color: var(--pv-text-sec);
}

.parent-view .sidebar__item--active {
  background: rgba(49, 130, 206, 0.08);
  color: var(--pv-accent);
  border-left-color: var(--pv-accent);
}

.parent-view .stat-card {
  background: var(--pv-surface);
  border-color: var(--pv-border);
}

.parent-view .stat-card__value { color: var(--pv-text); }
.parent-view .stat-card__label { color: var(--pv-text-sec); }

.parent-view .progress-card {
  background: var(--pv-surface);
  border-color: var(--pv-border);
}

.parent-view .data-table-wrapper {
  background: var(--pv-surface);
  border-color: var(--pv-border);
}

.parent-view .data-table thead {
  background: var(--pv-bg);
}

.parent-view .data-table th {
  color: var(--pv-text-sec);
  border-bottom-color: var(--pv-border);
}

.parent-view .data-table td {
  color: var(--pv-text);
  border-bottom-color: var(--pv-border);
}

.parent-view .data-table tbody tr:hover {
  background: rgba(49, 130, 206, 0.04);
}

.parent-view .btn--primary {
  background: var(--pv-accent);
  color: #FFFFFF;
}

.parent-view .btn--primary:hover {
  background: #2C5282;
  box-shadow: 0 2px 8px rgba(49, 130, 206, 0.25);
}

/* Grade indicator chips */
.parent-view .grade-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
}

.parent-view .grade-chip--a { background: #C6F6D5; color: #22543D; }
.parent-view .grade-chip--b { background: #BEE3F8; color: #2A4365; }
.parent-view .grade-chip--c { background: #FEFCBF; color: #744210; }
.parent-view .grade-chip--d { background: #FEEBC8; color: #7B341E; }
.parent-view .grade-chip--f { background: #FED7D7; color: #742A2A; }


/* ==========================================================================
   27. UTILITY CLASSES
   ========================================================================== */

/* Display */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.flex-wrap     { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1  { gap: var(--space-1); }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

.grid    { display: grid; }

/* Spacing */
.m-auto  { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-4    { margin-top: var(--space-4); }
.mt-8    { margin-top: var(--space-8); }
.mb-4    { margin-bottom: var(--space-4); }
.mb-8    { margin-bottom: var(--space-8); }
.p-4     { padding: var(--space-4); }
.p-6     { padding: var(--space-6); }
.p-8     { padding: var(--space-8); }
.px-4    { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6    { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-4    { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8    { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-16   { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.py-20   { padding-top: var(--space-20); padding-bottom: var(--space-20); }

/* Text */
.text-center    { text-align: center; }
.text-left      { text-align: left; }
.text-right     { text-align: right; }
.font-bold      { font-weight: 700; }
.font-semibold  { font-weight: 600; }
.font-medium    { font-weight: 500; }
.uppercase      { text-transform: uppercase; }
.tracking-wide  { letter-spacing: 0.05em; }

/* Colors */
.text-white        { color: var(--color-white); }
.text-muted        { color: var(--text-muted); }
.text-secondary    { color: var(--text-secondary); }
.text-blue         { color: var(--color-electric-blue); }
.text-green        { color: var(--color-neon-green); }
.text-danger       { color: var(--color-danger); }
.text-warning      { color: var(--color-warning); }

/* Width constraints */
.max-w-sm   { max-width: 24rem; }
.max-w-md   { max-width: 28rem; }
.max-w-lg   { max-width: 32rem; }
.max-w-xl   { max-width: 36rem; }
.max-w-2xl  { max-width: 42rem; }
.max-w-4xl  { max-width: 56rem; }
.max-w-full { max-width: 100%; }
.w-full     { width: 100%; }

/* Misc */
.rounded-md    { border-radius: var(--radius-md); }
.rounded-lg    { border-radius: var(--radius-lg); }
.rounded-xl    { border-radius: var(--radius-xl); }
.rounded-full  { border-radius: var(--radius-full); }
.overflow-hidden { overflow: hidden; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}


/* ==========================================================================
   28. RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* ---------- 1440px (Large Desktop) ---------- */
@media (max-width: 1440px) {
  :root {
    --content-max-width: 1200px;
  }

  .player {
    grid-template-columns: 280px 1fr 320px;
  }
}

/* ---------- 1024px (Tablet Landscape / Small Desktop) ---------- */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 240px;
  }

  /* Collapse AI panel in player */
  .player {
    grid-template-columns: 260px 1fr;
  }

  .player__ai-panel {
    position: fixed;
    top: var(--navbar-height);
    right: 0;
    bottom: 0;
    width: 340px;
    z-index: var(--z-overlay);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .player__ai-panel--open {
    transform: translateX(0);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.5);
  }

  /* Build lab adjustments */
  .build-lab {
    grid-template-columns: 220px 1fr;
  }

  .pricing__grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-6);
  }
}

/* ---------- 768px (Tablet Portrait) ---------- */
@media (max-width: 768px) {
  /* Navigation */
  .navbar__links {
    display: none;
  }

  .navbar__toggle {
    display: flex;
  }

  /* Dashboard goes single column */
  .dashboard {
    grid-template-columns: 1fr;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: var(--z-overlay);
  }

  .sidebar--mobile-open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
  }

  .dashboard__main {
    padding: var(--space-4);
  }

  .dashboard__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Player goes single column */
  .player {
    grid-template-columns: 1fr;
    height: auto;
  }

  .player__sidebar {
    border-right: none;
    border-bottom: 1px solid rgba(0, 229, 255, 0.08);
    max-height: 300px;
  }

  .player__ai-panel {
    width: 100%;
  }

  /* Build lab stacks */
  .build-lab {
    grid-template-columns: 1fr;
  }

  .build-lab__palette {
    border-right: none;
    border-bottom: 1px solid rgba(0, 229, 255, 0.08);
    max-height: 200px;
    overflow-x: auto;
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3);
    flex-wrap: nowrap;
  }

  .build-lab__palette-title {
    display: none;
  }

  .build-lab__component {
    flex-shrink: 0;
    margin-bottom: 0;
  }

  /* Mission grid: 2 columns */
  .mission-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }

  /* Quiz */
  .quiz {
    padding: var(--space-4);
  }

  /* Pricing cards stack */
  .pricing__grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }

  /* Badge grid */
  .badge-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  /* Certificate card stacks vertically */
  .certificate-card {
    flex-direction: column;
    text-align: center;
  }

  /* Toast fullwidth */
  .toast-container {
    left: var(--space-4);
    max-width: none;
  }

  /* Modal fullscreen on tablet */
  .modal {
    max-width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }

  .hero__title {
    font-size: var(--text-4xl);
  }

  .hero__cta-group {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- 480px (Mobile) ---------- */
@media (max-width: 480px) {
  :root {
    --navbar-height: 56px;
  }

  .navbar {
    padding: 0 var(--space-4);
  }

  .dashboard__stats {
    grid-template-columns: 1fr;
  }

  .dashboard__courses {
    grid-template-columns: 1fr;
  }

  .mission-grid {
    grid-template-columns: 1fr;
  }

  /* Stat card compact */
  .stat-card {
    padding: var(--space-4);
  }

  .stat-card__icon {
    width: 40px;
    height: 40px;
  }

  /* Skill tree scroll */
  .skill-tree {
    padding: var(--space-4);
  }

  .skill-node__circle {
    width: 44px;
    height: 44px;
    font-size: var(--text-base);
  }

  /* Answer cards stack */
  .answer-card {
    padding: var(--space-3) var(--space-4);
  }

  .answer-card__letter {
    width: 28px;
    height: 28px;
    font-size: var(--text-xs);
  }

  /* Code editor compact */
  .code-editor__gutter {
    min-width: 36px;
    padding: var(--space-3) var(--space-2);
  }

  .code-editor__content {
    padding: var(--space-3);
    font-size: var(--text-xs);
  }

  /* Auth form */
  .auth-form {
    padding: var(--space-6);
    border-radius: var(--radius-lg);
  }

  /* Badge grid */
  .badge-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
  }

  .badge-item {
    padding: var(--space-3);
  }

  .badge-item__icon {
    width: 44px;
    height: 44px;
  }

  /* Hero */
  .hero {
    padding: var(--space-16) var(--space-4);
    min-height: auto;
  }

  .hero__eyebrow {
    font-size: 0.625rem;
  }

  /* Simulator compact */
  .simulator {
    min-height: 300px;
  }

  .simulator__controls {
    bottom: var(--space-2);
    gap: var(--space-1);
    padding: var(--space-1);
  }

  /* Data table: horizontal scroll hint */
  .data-table-wrapper {
    position: relative;
  }

  .data-table-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 32px;
    background: linear-gradient(90deg, transparent, var(--color-card-bg));
    pointer-events: none;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  }

  /* Parent view compact */
  .parent-view .grade-chip {
    font-size: 0.625rem;
    min-width: 28px;
  }
}


/* ==========================================================================
   PRINT STYLES
   ========================================================================== */

@media print {
  body {
    background: #FFFFFF;
    color: #000000;
  }

  .navbar,
  .sidebar,
  .toast-container,
  .modal-overlay,
  .robot-avatar__glow,
  .hero::before,
  .hero::after,
  .circuit-bg::before,
  .grid-overlay::after {
    display: none !important;
  }

  .dashboard {
    grid-template-columns: 1fr;
  }

  .player {
    grid-template-columns: 1fr;
  }

  * {
    box-shadow: none !important;
    text-shadow: none !important;
    animation: none !important;
  }
}

/* =========================================================================
   KG3 Upgrade — world-class lesson sections
   Added for Unit 1 onwards. Uses existing cyan accent (#00E5FF) and the
   existing --course-primary / --course-bg / --course-surface tokens.
   ========================================================================= */

.lesson-intro-story {
  margin: 1.75rem 0;
  padding: 1.5rem 1.75rem;
  border-left: 4px solid var(--course-primary, #00E5FF);
  background: rgba(0, 229, 255, 0.06);
  border-radius: 0 14px 14px 0;
}

.lesson-intro-story h2 {
  margin: 0 0 0.5rem;
  color: var(--course-primary, #00E5FF);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.intro-story-quote {
  margin: 0;
  padding: 0;
  font-size: 1.1rem;
  line-height: 1.6;
  font-style: italic;
  color: var(--text-primary, #E8F4F8);
  border: none;
}

.lesson-core-concept {
  margin: 2rem 0;
}

.lesson-core-concept h2 {
  color: var(--course-primary, #00E5FF);
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.lesson-core-concept p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0.75rem 0;
  color: var(--text-primary, #E8F4F8);
}

.lesson-callouts {
  margin: 2rem 0;
}

.lesson-callouts h2 {
  color: var(--course-primary, #00E5FF);
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.callouts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.callout-box {
  padding: 1.1rem 1.25rem;
  border-radius: 12px;
  background: var(--course-surface, rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(0, 229, 255, 0.22);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
}

.callout-header {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.55rem;
}

.callout-icon {
  font-size: 1.35rem;
  line-height: 1;
}

.callout-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--course-primary, #00E5FF);
}

.callout-body p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--text-primary, #E8F4F8);
}

.callout-ai     { border-color: rgba(0, 229, 255, 0.45); }
.callout-real   { border-color: rgba(150, 211, 95, 0.45); }
.callout-domain { border-color: rgba(139, 92, 246, 0.45); }
.callout-mistake{ border-color: rgba(245, 158, 11, 0.55); }
.callout-code   { border-color: rgba(0, 229, 255, 0.55); background: rgba(0, 229, 255, 0.05); }

.icon-sequence,
.code-sample-sequence {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
}

.icon-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 0.55rem;
  border-radius: 8px;
  background: var(--course-primary, #00E5FF);
  color: #0A0A0B;
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: capitalize;
}

.icon-arrow {
  color: var(--course-primary, #00E5FF);
  font-weight: 700;
  font-size: 1.1rem;
}

.code-sample-caption,
.starter-caption {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: var(--text-secondary, #9EBAC2);
  font-style: italic;
}

/* Virtual Robot Lab mission section */
.lesson-mission {
  margin: 2rem 0;
  padding: 1.5rem;
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(0, 229, 255, 0.05), rgba(139, 92, 246, 0.05));
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.lesson-mission h2 {
  color: var(--course-primary, #00E5FF);
  margin-top: 0;
}

.mission-title-block .mission-title {
  margin: 0.25rem 0 0.75rem;
  font-size: 1.2rem;
  color: var(--text-primary, #E8F4F8);
}

.mission-brief p {
  font-size: 1rem;
  line-height: 1.65;
  margin: 0.5rem 0;
}

.lesson-mission h4 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
  color: var(--course-primary, #00E5FF);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.mission-steps-list {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

.mission-steps-list li {
  margin: 0.45rem 0;
  line-height: 1.5;
}

.observation-table,
.rubric-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 10px;
  overflow: hidden;
}

.observation-table th,
.observation-table td,
.rubric-table th,
.rubric-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid rgba(0, 229, 255, 0.18);
  font-size: 0.95rem;
  line-height: 1.45;
  vertical-align: top;
}

.observation-table th,
.rubric-table th {
  background: rgba(0, 229, 255, 0.12);
  color: var(--course-primary, #00E5FF);
  font-weight: 700;
  text-align: left;
}

.observation-table .hint-cell {
  color: var(--text-secondary, #9EBAC2);
  font-style: italic;
  background: rgba(0, 0, 0, 0.15);
}

.observation-table .editable-cell {
  background: rgba(255, 255, 255, 0.02);
  min-height: 2.25rem;
  cursor: text;
}

.observation-table .editable-cell:focus {
  outline: 2px solid var(--course-primary, #00E5FF);
  outline-offset: -2px;
  background: rgba(0, 229, 255, 0.08);
}

.analysis-qa,
.check-qa {
  margin: 0.5rem 0;
  padding: 0.55rem 0.85rem;
  border-left: 3px solid rgba(0, 229, 255, 0.45);
  border-radius: 0 8px 8px 0;
  background: rgba(0, 229, 255, 0.04);
}

.analysis-qa summary,
.check-qa summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary, #E8F4F8);
  list-style: none;
}

.analysis-qa summary::before,
.check-qa summary::before {
  content: '\25B8  ';
  color: var(--course-primary, #00E5FF);
  display: inline-block;
  width: 1.2rem;
  transition: transform 0.15s ease;
}

.analysis-qa[open] summary::before,
.check-qa[open] summary::before {
  transform: rotate(90deg);
}

.analysis-answer,
.check-answer {
  margin: 0.5rem 0 0;
  color: var(--text-secondary, #9EBAC2);
  line-height: 1.55;
}

.success-criteria-list,
.self-assessment-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
}

.success-criteria-list li,
.self-assessment-list li {
  margin: 0.35rem 0;
}

.criterion-label,
.self-assessment-list label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  cursor: pointer;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  transition: background 0.15s ease;
}

.criterion-label:hover,
.self-assessment-list label:hover {
  background: rgba(0, 229, 255, 0.06);
}

.common-errors-list dt {
  font-weight: 700;
  color: #F59E0B;
  margin-top: 0.65rem;
}

.common-errors-list dd {
  margin: 0.15rem 0 0.5rem 1rem;
  color: var(--text-secondary, #9EBAC2);
}

.lesson-design-challenge {
  margin: 2rem 0;
  padding: 1.5rem;
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(150, 211, 95, 0.05), rgba(0, 229, 255, 0.04));
  border: 1px solid rgba(150, 211, 95, 0.3);
}

.lesson-design-challenge h2 {
  color: #96D35F;
  margin-top: 0;
}

.lesson-design-challenge h4 {
  margin: 1.1rem 0 0.5rem;
  font-size: 1rem;
  color: #96D35F;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.rubric-table .criterion-name {
  font-weight: 700;
  background: rgba(150, 211, 95, 0.08);
  color: var(--text-primary, #E8F4F8);
}

.design-model-answer {
  margin-top: 1.1rem;
  padding: 0.85rem 1rem;
  border-left: 3px solid #96D35F;
  background: rgba(150, 211, 95, 0.04);
  border-radius: 0 10px 10px 0;
}

.design-model-answer summary {
  cursor: pointer;
  font-weight: 600;
  color: #96D35F;
}

.model-sentence {
  font-size: 1rem;
  font-style: italic;
  color: var(--text-primary, #E8F4F8);
}

.lesson-summary {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  background: rgba(0, 229, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.2);
}

.lesson-summary h2 {
  color: var(--course-primary, #00E5FF);
  margin-top: 0;
}

.summary-list {
  margin: 0.5rem 0;
  padding-left: 0;
  list-style: none;
}

.summary-list li {
  margin: 0.5rem 0;
  font-size: 1rem;
  line-height: 1.5;
}

.lesson-et-chips {
  margin: 2rem 0;
}

.lesson-et-chips h2 {
  color: var(--course-primary, #00E5FF);
  font-size: 1.2rem;
}

.et-chips-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.et-chip {
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: transparent;
  border: 1.5px solid var(--course-primary, #00E5FF);
  color: var(--course-primary, #00E5FF);
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.18s ease;
  font-family: inherit;
}

.et-chip:hover,
.et-chip:focus {
  background: var(--course-primary, #00E5FF);
  color: #0A0A0B;
  transform: translateY(-1px);
  outline: none;
}

/* Badge colouring for the new session types */
.badge-instruction    { background: #00E5FF; color: #0A0A0B; }
.badge-practice       { background: #96D35F; color: #0A0A0B; }
.badge-virtual_robot_lab { background: #8B5CF6; color: #FFFFFF; }
.badge-home_practice  { background: #F59E0B; color: #0A0A0B; }

/* =============================================================================
   2026-05-04 (Tier 5 Item 3) — CodeEditor + RunnableCodePanel scoped styles
   ============================================================================= */

/* When the CodeEditor class instantiates inline (simulator.html's
   #code-editor-container, course.html's mission panel), it builds its own
   children: .code-toolbar, .code-textarea-wrapper, .code-console, etc.
   Without these styles the layout flowed full-width with no containment.
   Tier 2 surfaced this; Tier 5 polishes it. */

#code-editor-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  background: #0A1220;
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: 8px;
  overflow: hidden;
}

#code-editor-container .code-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: rgba(0, 229, 255, 0.04);
  border-bottom: 1px solid rgba(0, 229, 255, 0.1);
  flex-shrink: 0;
}

#code-editor-container .code-mode-select,
#code-editor-container .code-template-select {
  padding: 0.375rem 0.625rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 6px;
  color: #fff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  cursor: pointer;
}

#code-editor-container .code-btn {
  padding: 0.375rem 0.875rem;
  border: none;
  border-radius: 6px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s, transform 0.1s;
}
#code-editor-container .code-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
#code-editor-container .code-btn:focus-visible { outline: 2px solid #00FF88; outline-offset: 2px; }
#code-editor-container .code-btn-run {
  background: linear-gradient(135deg, #00FF88, #00CC6A);
  color: #050A14;
}
#code-editor-container .code-btn-step {
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: #00E5FF;
}
#code-editor-container .code-btn-stop {
  background: rgba(255, 77, 106, 0.1);
  border: 1px solid rgba(255, 77, 106, 0.25);
  color: #FF4D6A;
}

/* The textarea / blocks workspace fills the remaining height. */
#code-editor-container .code-textarea-wrapper,
#code-editor-container .code-blocks-workspace {
  flex: 1 1 auto;
  min-height: 200px;
  position: relative;
  overflow: auto;
}

#code-editor-container .code-textarea {
  width: 100%;
  height: 100%;
  min-height: 200px;
  padding: 0.75rem 0.875rem;
  background: #0A0E27;
  color: #E0F7FA;
  border: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  tab-size: 4;
  outline: none;
  white-space: pre;
  overflow-wrap: normal;
}

#code-editor-container .code-textarea-highlight {
  position: absolute;
  inset: 0;
  padding: 0.75rem 0.875rem;
  pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
  overflow: hidden;
  color: transparent;
}

#code-editor-container .code-gutter {
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  padding: 0.75rem 0.25rem 0;
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.3);
  background: rgba(0, 0, 0, 0.2);
  pointer-events: none;
  user-select: none;
}

/* Console panel below the editor. */
#code-editor-container .code-console {
  flex-shrink: 0;
  max-height: 200px;
  overflow-y: auto;
  padding: 0.5rem 0.75rem;
  background: #050A14;
  color: #E0E7EE;
  border-top: 1px solid rgba(0, 229, 255, 0.1);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.5;
}
#code-editor-container .code-console-line {
  padding: 0.125rem 0;
  white-space: pre-wrap;
  word-break: break-word;
}
#code-editor-container .code-console-line.error { color: #FF4D6A; }
#code-editor-container .code-console-line.info  { color: #00E5FF; }

/* Robot API reference sidebar (collapsible). */
#code-editor-container .robot-api-reference {
  padding: 0.5rem 0.75rem;
  background: rgba(0, 229, 255, 0.04);
  border-top: 1px solid rgba(0, 229, 255, 0.08);
  font-size: 0.75rem;
  max-height: 240px;
  overflow-y: auto;
}
#code-editor-container .robot-api-reference h4 {
  color: #00E5FF;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin: 0.5rem 0 0.25rem;
}

/* Python keyword highlighting (lifted into shared scope). */
#code-editor-container .hl-keyword { color: #FF79C6; }
#code-editor-container .hl-builtin { color: #8BE9FD; }
#code-editor-container .hl-string  { color: #F1FA8C; }
#code-editor-container .hl-comment { color: #6272A4; font-style: italic; }
#code-editor-container .hl-number  { color: #BD93F9; }
#code-editor-container .hl-funcdef { color: #50FA7B; }
#code-editor-container .hl-robot-api { color: #00FF88; font-weight: 600; }

/* Lesson-embedded runnable Python panel (Tier 5 Item 1). */
.mission-runnable-code {
  margin-top: 1.25rem;
  padding: 1rem;
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 8px;
}
.mission-runnable-code h4 {
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  color: #00E5FF;
}
.mission-runnable-code .runnable-code-editor:focus {
  outline: none;
  border-color: #00E5FF;
  box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.15);
}
.mission-runnable-code .btn-run-code:hover {
  filter: brightness(1.1);
}
.mission-runnable-code .btn-run-code:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* =============================================================================
   PWA Tier 7 — mobile-native polish (2026-05-04)

   The 768px + 480px responsive blocks above cover the original SPA layout
   (catalogue / pricing / hero / sidebar slide). This section closes the
   remaining gaps surfaced once the manifest + service worker landed and the
   course was installable as a phone app:

   - Touch-target sizing (≥ 44 × 44 CSS px per WCAG 2.5.5 / Apple HIG).
   - Capstone form + portfolio grid: single column on phones.
   - Build Lab workspace: scrollable canvas instead of the ≥ 1024px split.
   - Course player + code editor: comfortable font + line-height on small
     screens, no horizontal scroll on prose.
   - Safe-area insets so the bottom of the page isn't hidden under the iOS
     home indicator when launched standalone.

   Everything is additive. No previously-set rule is overridden — these
   blocks only fire when the matching breakpoint hits.
   ============================================================================= */

/* Common to every robotics page when launched as a PWA: respect iOS home-bar
   inset so floating action buttons don't sit underneath it. */
@supports (padding: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }
  .fab,
  .et-plus-fab,
  .quick-actions-fab {
    bottom: max(1.5rem, calc(1.5rem + env(safe-area-inset-bottom)));
  }
}

@media (max-width: 768px) {
  /* --- Tap-target floor: every interactive control reaches 44 × 44 px ---- */
  button,
  .btn,
  .pf-tab,
  .pf-filter-btn,
  a.btn,
  a.button,
  input[type="button"],
  input[type="submit"] {
    min-height: 44px;
  }

  /* --- Capstone portal: form rows + actions stack on phones --- */
  .capstone-form-grid {
    grid-template-columns: 1fr !important;
    gap: 0.75rem;
  }
  .capstone-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .capstone-actions > * {
    width: 100%;
    text-align: center;
  }

  /* --- Portfolio viewer: my entries + showcase grids drop to one column --- */
  .pf-grid {
    grid-template-columns: 1fr;
  }
  .pf-tabs {
    -webkit-overflow-scrolling: touch;
  }

  /* --- Course player: prose + code don't bleed off-screen --- */
  .lesson-content,
  .mission-runnable-code {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .runnable-code-editor,
  pre,
  code {
    font-size: 0.78rem !important;
    line-height: 1.45;
    white-space: pre-wrap;
    word-break: break-word;
  }

  /* --- Build Lab: workspace scrolls, palette docks at top --- */
  .build-lab-workspace {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    min-height: 420px;
  }
  .build-lab__palette {
    /* Allow the palette to scroll horizontally without forcing the
       whole page to scroll. */
    -webkit-overflow-scrolling: touch;
  }

  /* --- Dashboard cards: shrink padding so titles don't truncate --- */
  .dashboard__card,
  .et-plus-greeting,
  .progress-overview {
    padding: 1rem;
  }

  /* --- AI tutor chat panel: take full width when open on mobile --- */
  .ai-tutor-panel {
    width: 100% !important;
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  /* Phone-portrait — drop further padding + reduce title size on hero
     blocks so the dashboard fits in one viewport. */
  .pf-hero,
  .capstone-hero {
    padding: 1rem;
  }
  .pf-hero h1,
  .capstone-hero h1 {
    font-size: clamp(1.25rem, 5vw, 1.6rem);
  }

  /* Service-worker tip: when offline, the course player still renders
     from cache. Show the offline-pill if we ever wire one in. */
  body.is-offline::before {
    content: "Offline — showing cached content";
    display: block;
    background: rgba(255, 200, 0, 0.12);
    color: #FFD166;
    text-align: center;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
  }
}

/* =============================================================================
   Section error boundary placeholder (Tier 8 Item 3).

   Rendered by `assets/js/error-boundary.js` when a renderer throws so a
   single section failure doesn't blank the whole page.
   ============================================================================= */
.arp-error-placeholder {
  padding: 1.5rem 1.25rem;
  border-radius: 12px;
  background: rgba(255, 200, 0, 0.06);
  border: 1px dashed rgba(255, 200, 0, 0.35);
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  font-family: 'Space Grotesk', system-ui, sans-serif;
}
.arp-error-placeholder__icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.arp-error-placeholder__title {
  font-weight: 600;
  font-size: 0.95rem;
  color: #FFD166;
  margin-bottom: 0.25rem;
}
.arp-error-placeholder__hint {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}
.arp-error-placeholder__hint a {
  color: #00E5FF;
  text-decoration: none;
  margin-left: 0.25rem;
}
.arp-error-placeholder__hint a:hover {
  text-decoration: underline;
}

/* =============================================================================
   Mission grader panel (Tier 8 Item 6 — assets/js/mission-grader.js).

   Rendered after the student clicks "Submit for grading" in a mission's
   inline Pyodide editor. Visual goals: a clear score chip, a checklist
   of per-test pass/fail, hints surfaced inline so the student knows
   what to try next, and stdout collapsed in a details element.
   ============================================================================= */
.mg-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 10px;
  font-family: 'Space Grotesk', system-ui, sans-serif;
}
.mg-panel__header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.mg-score {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  font-family: 'JetBrains Mono', monospace;
}
.mg-score__label {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.875rem;
  font-family: 'JetBrains Mono', monospace;
}
.mg-passed {
  margin-left: auto;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.8125rem;
}
.mg-test-list {
  list-style: none;
  padding: 0;
  margin: 0 0 0.75rem;
  display: grid;
  gap: 0.375rem;
}
.mg-test-row {
  display: grid;
  grid-template-columns: 1.25rem 1fr;
  align-items: start;
  gap: 0.5rem;
  padding: 0.5rem 0.625rem;
  border-radius: 6px;
  font-size: 0.8125rem;
}
.mg-test-row--pass { background: rgba(0, 255, 136, 0.06); color: rgba(255,255,255,0.85); }
.mg-test-row--fail { background: rgba(255, 107, 107, 0.06); color: rgba(255,255,255,0.85); }
.mg-test-icon { font-weight: 700; }
.mg-test-row--pass .mg-test-icon { color: #00FF88; }
.mg-test-row--fail .mg-test-icon { color: #FF6B6B; }
.mg-test-name { line-height: 1.45; }
.mg-test-hint {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: #FFD166;
}
.mg-test-error {
  display: block;
  margin-top: 0.25rem;
  padding: 0.25rem 0.5rem;
  background: rgba(255, 107, 107, 0.08);
  border-left: 2px solid #FF6B6B;
  color: #FFB4B4;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  line-height: 1.4;
}
.mg-error {
  margin-bottom: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 107, 107, 0.08);
  border-left: 3px solid #FF6B6B;
  border-radius: 6px;
  font-size: 0.8125rem;
  color: #FFB4B4;
}
.mg-stdout {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
}
.mg-stdout summary {
  cursor: pointer;
  user-select: none;
}
.mg-stdout pre {
  margin: 0.375rem 0 0;
  padding: 0.5rem 0.625rem;
  background: #0A1220;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.7);
  max-height: 180px;
  overflow: auto;
  white-space: pre-wrap;
}
.mg-meta {
  text-align: right;
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.4);
  font-family: 'JetBrains Mono', monospace;
  margin-top: 0.5rem;
}
.mg-submit-btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, #00E5FF, #009FCC);
  color: #050A14;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.8125rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  transition: filter 0.15s;
}
.mg-submit-btn:hover { filter: brightness(1.1); }
.mg-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* =============================================================================
   Lesson video walkthrough (Tier 8 Item 7).

   Rendered above the intro story when lesson.videoUrl is defined. The
   <video> tag uses the browser's native chrome — keeps the surface
   small and a11y-correct out of the box.
   ============================================================================= */
.lesson-video {
  margin: 1.5rem 0 2rem;
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.04), rgba(0, 255, 136, 0.04));
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 12px;
}
.lesson-video h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: #00E5FF;
}
.lesson-video__caption {
  margin: 0.625rem 0 0;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.55;
}

/* =============================================================================
   Per-lesson forum thread (Tier 8 Item 9 — assets/js/lesson-forum.js).
   ============================================================================= */
.lesson-forum {
  margin: 1.5rem 0;
}
.lf-toggle {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.875rem 1.25rem;
  background: rgba(0, 229, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 10px;
  color: #fff;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}
.lf-toggle:hover { background: rgba(0, 229, 255, 0.1); }
.lf-toggle__icon { font-size: 1.125rem; }
.lf-toggle__chevron {
  margin-left: auto;
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.5);
  transition: transform 0.15s;
}
.lf-panel {
  margin-top: 0.625rem;
  padding: 1rem;
  background: #0A1220;
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 10px;
}
.lf-panel__loading {
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  padding: 1rem;
  font-size: 0.875rem;
}
.lf-list { display: grid; gap: 0.5rem; margin-bottom: 1rem; }
.lf-empty {
  text-align: center;
  padding: 1rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.875rem;
}
.lf-topic {
  padding: 0.625rem 0.75rem;
  background: rgba(0, 229, 255, 0.04);
  border-radius: 8px;
  border-left: 2px solid rgba(0, 229, 255, 0.3);
}
.lf-topic__title {
  font-weight: 500;
  margin-bottom: 0.25rem;
  font-size: 0.9375rem;
}
.lf-topic__meta {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
  display: flex;
  gap: 0.375rem;
}
.lf-new {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  padding-top: 0.875rem;
  border-top: 1px solid rgba(0, 229, 255, 0.1);
}
.lf-new__title,
.lf-new__body {
  padding: 0.625rem 0.75rem;
  background: #050A14;
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-radius: 6px;
  color: #fff;
  font-family: inherit;
  font-size: 0.875rem;
}
.lf-new__title:focus,
.lf-new__body:focus {
  outline: none;
  border-color: #00E5FF;
  box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.15);
}
.lf-new__body { resize: vertical; min-height: 80px; }
.lf-new__submit {
  padding: 0.5rem 1.25rem;
  background: linear-gradient(135deg, #00FF88, #00CC6A);
  color: #050A14;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.8125rem;
  justify-self: start;
}
.lf-new__submit:disabled { opacity: 0.5; cursor: not-allowed; }
.lf-new__status {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
}

/* =============================================================================
   Live class card (Tier 8 Item 15).
   ============================================================================= */
.lesson-liveclass {
  margin: 1.25rem 0 1.75rem;
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(255, 200, 0, 0.06), rgba(0, 229, 255, 0.05));
  border: 1px solid rgba(255, 200, 0, 0.3);
  border-radius: 12px;
}
.lesson-liveclass h2 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: #FFD166;
}
.lc-platform { color: #00E5FF; font-weight: 500; }
.lc-meta {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.875rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  flex-wrap: wrap;
}
.lc-state {
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  letter-spacing: 1px;
}
.lc-state--future { background: rgba(0, 229, 255, 0.12); color: #00E5FF; }
.lc-state--live   { background: rgba(0, 255, 136, 0.18); color: #00FF88; animation: lc-pulse 1.5s infinite; }
.lc-state--past   { background: rgba(255, 255, 255, 0.06); color: rgba(255,255,255,0.5); }
@keyframes lc-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.lc-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.lc-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: filter 0.15s, transform 0.15s;
}
.lc-btn--join.lc-btn--active {
  background: linear-gradient(135deg, #00FF88, #00CC6A);
  color: #050A14;
}
.lc-btn--join.lc-btn--active:hover { filter: brightness(1.1); transform: translateY(-1px); }
.lc-btn--join.lc-btn--inactive {
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: #00E5FF;
}
.lc-btn--watch {
  background: linear-gradient(135deg, #00E5FF, #009FCC);
  color: #050A14;
}
.lc-btn--cal {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.7);
}
.lc-btn--cal:hover { background: rgba(255,255,255,0.05); color: #fff; }
.lc-title {
  margin: 0;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
  font-style: italic;
}

/* ==========================================================================
   41. PUBLIC LANDING PAGE — header, nav, hero, sections, footer
   --------------------------------------------------------------------------
   These rules paint the marketing site shared by index.html and
   _landing.html. The HTML uses BEM names (.nav__*, .hero__*, .feature-card,
   .band-card, .pricing*, .faq*, .testimonials*, .footer__*, etc.). All
   selectors are scoped — no element-level styles, no `*` resets, so the
   authenticated pages (dashboard.html, course.html, etc.) which have their
   own per-page inline `<style>` blocks are unaffected.
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 10, 20, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-blue-dim);
}
.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--color-white);
}
.nav__logo-icon { display: inline-flex; flex-shrink: 0; }
.nav__logo-text {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--color-white);
}
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: transparent;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
}
.nav__toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.72);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.15s;
  position: relative;
}
.nav__link:hover { color: var(--color-electric-blue); }
.nav__link::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--color-electric-blue);
  transform: scaleX(0);
  transition: transform 0.2s;
  transform-origin: center;
}
.nav__link:hover::after { transform: scaleX(1); }
.nav__cta-link {
  background: linear-gradient(135deg, var(--color-neon-green), #00CC6A);
  color: var(--color-space-black) !important;
  padding: 0.5rem 1.125rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 18px rgba(0, 255, 136, 0.28);
  transition: transform 0.15s, box-shadow 0.15s;
}
.nav__cta-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0, 255, 136, 0.4);
}
.nav__cta-link::after { display: none; }

@media (max-width: 768px) {
  .nav__toggle { display: inline-flex; }
  .nav__links {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--color-dark-panel);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1.5rem 1.25rem;
    border-bottom: 1px solid var(--color-blue-dim);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s, transform 0.18s;
  }
  .nav__links[data-open="true"] { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__link { padding: 0.75rem 0; }
}

/* ----- Generic section container + headings (used by every section) ----- */
.section__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}
.section__heading {
  text-align: center;
  margin: 0 0 0.75rem 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.02em;
}
.section__subheading {
  text-align: center;
  margin: 0 auto 3rem auto;
  max-width: 720px;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.65);
}

/* ----- Hero ----- */
.hero__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 1.5rem 6rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 3rem;
}
.hero__content { display: flex; flex-direction: column; gap: 1.25rem; }
.hero__heading {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: clamp(2.25rem, 4.5vw, 3.75rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
.hero__subtitle {
  margin: 0;
  max-width: 560px;
  font-size: 1.125rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.72);
}
.hero__actions {
  display: flex;
  gap: 0.875rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}
.hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.875rem 0;
  border-left: 2px solid var(--color-blue-dim);
  padding-left: 0.875rem;
}
.hero__stat-value {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.375rem;
  color: var(--color-white);
}
.hero__stat-label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
}
.hero__visual { display: flex; align-items: center; justify-content: center; }
.hero__svg, .hero__robot-graphic { max-width: 100%; height: auto; }

@media (max-width: 900px) {
  .hero__container { grid-template-columns: 1fr; padding: 3.5rem 1.5rem 4rem; }
  .hero__visual { order: -1; max-width: 360px; margin: 0 auto; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
}

/* ----- Buttons (extend existing .btn family) ----- */
.btn--full { width: 100%; justify-content: center; }
.btn--large {
  font-size: 1.0625rem;
  padding: 0.875rem 1.75rem;
  border-radius: 12px;
}

/* ----- Features section ----- */
.features { padding: 0; }
.features__grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}
.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-blue-glow);
  box-shadow: 0 12px 32px rgba(0, 229, 255, 0.12);
}
.feature-card__icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-blue-dim);
  border-radius: 10px;
  color: var(--color-electric-blue);
  font-size: 1.5rem;
}
.feature-card__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-white);
}
.feature-card__description {
  margin: 0;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.9375rem;
  line-height: 1.55;
}
@media (max-width: 980px) { .features__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .features__grid { grid-template-columns: 1fr; } }

/* ----- Curriculum / Bands ----- */
.curriculum { padding: 0; }
.curriculum__bands {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.band-card {
  position: relative;
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}
.band-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-neon-green));
}
.band-card:hover { transform: translateY(-3px); border-color: var(--color-blue-glow); }
.band-card--explorers::before { background: linear-gradient(90deg, #00C896, #00E0B5); }
.band-card--builders::before { background: linear-gradient(90deg, #1ABF7A, #00FF88); }
.band-card--engineers::before { background: linear-gradient(90deg, #00E5FF, #1A6AFF); }
.band-card--innovators::before { background: linear-gradient(90deg, #8B5CF6, #FF4DD8); }
.band-card__badge {
  display: inline-block;
  align-self: flex-start;
  background: var(--color-blue-dim);
  color: var(--color-electric-blue);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
}
.band-card__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
}
.band-card__grades {
  font-size: 0.8125rem;
  color: var(--color-electric-blue);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.band-card__ages { font-size: 0.8125rem; color: rgba(255, 255, 255, 0.5); }
.band-card__focus { font-size: 0.9375rem; color: rgba(255, 255, 255, 0.78); line-height: 1.5; }
.band-card__topics {
  margin: 0.5rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.68);
}
.band-card__topics li::before {
  content: '▸ ';
  color: var(--color-electric-blue);
  margin-right: 0.25rem;
}
@media (max-width: 1024px) { .curriculum__bands { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .curriculum__bands { grid-template-columns: 1fr; } }

/* ----- Pricing ----- */
.pricing { padding: 0; }
.pricing__card {
  max-width: 480px;
  margin: 0 auto 2rem;
  background: var(--color-card-bg);
  border: 2px solid var(--color-electric-blue);
  border-radius: 18px;
  padding: 2.25rem;
  text-align: center;
  position: relative;
  box-shadow: 0 8px 40px rgba(0, 229, 255, 0.15);
}
.pricing__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.375rem 1rem;
  border-radius: 999px;
}
.pricing__plan-name {
  margin: 0 0 0.5rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.125rem;
  color: var(--color-electric-blue);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.pricing__price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
  margin: 0.5rem 0 1rem;
}
.pricing__currency { font-size: 1.5rem; color: var(--color-white); font-weight: 600; }
.pricing__amount {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.02em;
}
.pricing__period { font-size: 0.9375rem; color: rgba(255, 255, 255, 0.55); }
.pricing__features {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  text-align: left;
}
.pricing__feature {
  display: flex;
  gap: 0.625rem;
  align-items: flex-start;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.4;
}
.pricing__check { color: var(--color-neon-green); font-weight: 700; flex-shrink: 0; }
.pricing__note { font-size: 0.8125rem; color: rgba(255, 255, 255, 0.55); margin-top: 1.25rem; }
.pricing__contact-link { color: var(--color-electric-blue); text-decoration: none; font-weight: 600; }
.pricing__contact-link:hover { text-decoration: underline; }

/* ----- How it works / Steps ----- */
.how-it-works { padding: 0; }
.steps {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
}
.step {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-align: center;
  align-items: center;
  position: relative;
}
.step__number {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  border-radius: 50%;
}
.step__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
}
.step__description {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.62);
}
.step__connector {
  display: none; /* purely decorative; not load-bearing */
}
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .steps { grid-template-columns: 1fr; } }

/* ----- Testimonials ----- */
.testimonials { padding: 0; }
.testimonials__grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.testimonial-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.testimonial-card__quote {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.85);
  font-style: italic;
  position: relative;
}
.testimonial-card__author {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  border-top: 1px solid var(--color-blue-dim);
  padding-top: 0.875rem;
}
.testimonial-card__name { font-weight: 600; color: var(--color-white); font-size: 0.9375rem; }
.testimonial-card__role { font-size: 0.8125rem; color: var(--color-electric-blue); }
@media (max-width: 980px) { .testimonials__grid { grid-template-columns: 1fr; max-width: 640px; } }

/* ----- FAQ ----- */
.faq { padding: 0; }
.faq__list {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.faq__item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.18s;
}
.faq__item:hover { border-color: var(--color-blue-glow); }
.faq__question {
  margin: 0;
  padding: 1.125rem 1.5rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-white);
  cursor: pointer;
  position: relative;
  list-style: none;
}
.faq__question::after {
  content: '+';
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-electric-blue);
  font-size: 1.25rem;
  font-weight: 400;
  transition: transform 0.2s;
}
.faq__item[open] .faq__question::after { content: '−'; }
.faq__answer {
  margin: 0;
  padding: 0 1.5rem 1.25rem;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ----- Final CTA ----- */
.final-cta {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(0, 255, 136, 0.08));
  border-top: 1px solid var(--color-blue-dim);
  border-bottom: 1px solid var(--color-blue-dim);
  padding: 4rem 1.5rem;
  text-align: center;
}
.final-cta__heading {
  margin: 0 auto 0.75rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--color-white);
  max-width: 720px;
}
.final-cta__text {
  margin: 0 auto 2rem;
  max-width: 580px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1.0625rem;
  line-height: 1.55;
}
.final-cta__actions {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ----- Footer ----- */
.site-footer {
  background: var(--color-dark-panel);
  border-top: 1px solid var(--color-blue-dim);
  padding: 4rem 0 0;
}
.footer__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-blue-dim);
}
.footer__brand { display: flex; flex-direction: column; gap: 0.875rem; max-width: 320px; }
.footer__logo { display: inline-flex; gap: 0.5rem; align-items: center; color: var(--color-white); font-weight: 700; font-size: 1.0625rem; text-decoration: none; }
.footer__tagline { margin: 0; color: rgba(255, 255, 255, 0.6); font-size: 0.875rem; line-height: 1.5; }
.footer__column { display: flex; flex-direction: column; gap: 0.625rem; }
.footer__column-title {
  margin: 0 0 0.25rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-electric-blue);
}
.footer__links {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer__links a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.15s;
}
.footer__links a:hover { color: var(--color-white); }
.footer__bottom {
  padding: 1.25rem 1.5rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.8125rem;
}
.footer__copyright { margin: 0; }
@media (max-width: 900px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 540px) {
  .footer__grid { grid-template-columns: 1fr; }
}

/* ----- Small accents (ET+ robot graphic, animations) ----- */
.et-robot { display: inline-flex; }
.et-robot__avatar { display: inline-flex; }
.antenna-light { fill: var(--color-neon-green); }
.robot-eye { fill: var(--color-electric-blue); }
.text-accent { color: var(--color-electric-blue); }
@keyframes arp-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes arp-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}
.animate-fade-in { animation: arp-fade-in 0.5s ease-out both; }
.animate-fade-in-delay { animation: arp-fade-in 0.5s ease-out 0.18s both; }
.animate-float { animation: arp-float 4s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  .animate-fade-in, .animate-fade-in-delay, .animate-float { animation: none; }
}

/* ==========================================================================
   42. DASHBOARD ARP LAYOUT — emitted by assets/js/dashboard.js
   --------------------------------------------------------------------------
   The student dashboard's data sections (welcome, stats, current unit,
   activity, weekly summary, badges, skill radar, parent report) are all
   rendered dynamically with .arp-* BEM classes. These rules paint them.
   ========================================================================== */

.arp-dashboard {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.arp-dashboard__grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 1.5rem;
}
.arp-dashboard__left,
.arp-dashboard__right {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
@media (max-width: 1100px) {
  .arp-dashboard__grid { grid-template-columns: 1fr; }
}

/* ----- Welcome banner ----- */
.arp-welcome {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(0, 255, 136, 0.06));
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
}
.arp-welcome__avatar {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50%;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}
.arp-welcome__text { display: flex; flex-direction: column; gap: 0.25rem; }
.arp-welcome__text h2,
.arp-welcome__text strong:first-child {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-welcome__text p { margin: 0; color: rgba(255, 255, 255, 0.72); font-size: 0.9375rem; }

/* ----- Stats row ----- */
.arp-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
@media (max-width: 800px) { .arp-stats-row { grid-template-columns: repeat(2, 1fr); } }
.arp-stat-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 12px;
  padding: 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  position: relative;
  transition: border-color 0.18s, transform 0.18s;
}
.arp-stat-card:hover { border-color: var(--color-blue-glow); transform: translateY(-1px); }
.arp-stat-card__icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-blue-dim);
  color: var(--color-electric-blue);
  border-radius: 9px;
}
.arp-stat-card__icon svg { width: 20px; height: 20px; }
.arp-stat-card__value {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-white);
  line-height: 1.1;
}
.arp-stat-card__label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.02em;
}

/* ----- Current Unit card ----- */
.arp-current-unit {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.arp-current-unit > h2,
.arp-current-unit > h3,
.arp-current-unit__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-white);
}
.arp-current-unit__card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.arp-current-unit__info { display: flex; flex-direction: column; gap: 0.375rem; }
.arp-current-unit__info strong {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-current-unit__info span { color: rgba(255, 255, 255, 0.65); font-size: 0.875rem; }
.arp-progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.arp-progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-neon-green));
  border-radius: 4px;
  transition: width 0.5s ease;
}
.arp-progress-bar__label {
  font-size: 0.8125rem;
  color: var(--color-electric-blue);
  font-weight: 600;
}

/* ----- Buttons (.arp-btn family) ----- */
.arp-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.625rem 1.125rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}
.arp-btn--primary {
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.25);
}
.arp-btn--primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0, 229, 255, 0.4); }
.arp-btn--outline {
  background: transparent;
  border-color: var(--color-electric-blue);
  color: var(--color-electric-blue);
}
.arp-btn--outline:hover { background: var(--color-blue-dim); }
.arp-btn--ghost { background: transparent; color: rgba(255, 255, 255, 0.72); }
.arp-btn--ghost:hover { background: rgba(255, 255, 255, 0.05); color: var(--color-white); }
.arp-btn--sm { padding: 0.4375rem 0.875rem; font-size: 0.8125rem; }

/* ----- Recent Activity ----- */
.arp-activity {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.arp-activity > h2,
.arp-activity > h3 {
  margin: 0 0 0.25rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-activity__empty {
  margin: 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.9375rem;
  font-style: italic;
}
.arp-activity__list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.arp-activity__item {
  display: grid;
  grid-template-columns: 12px 1fr auto auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px dashed rgba(0, 229, 255, 0.08);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
}
.arp-activity__item:last-child { border-bottom: 0; }
.arp-activity__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-neon-green);
  box-shadow: 0 0 8px var(--color-green-glow);
}
.arp-activity__lesson { color: var(--color-white); font-weight: 500; }
.arp-activity__score { color: var(--color-electric-blue); font-weight: 600; }
.arp-activity__time { color: rgba(255, 255, 255, 0.45); font-size: 0.8125rem; }

/* ----- Weekly Summary ----- */
.arp-weekly-summary {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.arp-weekly-summary > h2,
.arp-weekly-summary > h3 {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-weekly-summary__body {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9375rem;
  line-height: 1.55;
}
.arp-weekly-summary__placeholder { color: rgba(255, 255, 255, 0.5); font-style: italic; }

/* ----- Recommended Next ----- */
.arp-recommended {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.06), rgba(139, 92, 246, 0.06));
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.arp-recommended__card { display: flex; flex-direction: column; gap: 0.5rem; }

/* ----- Skill Radar ----- */
.arp-skill-radar {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.arp-skill-radar svg { width: 100%; max-width: 280px; height: auto; }

/* ----- Badges ----- */
.arp-badges {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.arp-badges > h2,
.arp-badges > h3 {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-badges__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 0.875rem;
}
.arp-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 0.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  text-align: center;
  transition: transform 0.18s, border-color 0.18s;
}
.arp-badge:hover { transform: translateY(-1px); }
.arp-badge--earned {
  border-color: var(--color-green-glow);
  background: rgba(0, 255, 136, 0.06);
}
.arp-badge--locked { opacity: 0.45; filter: grayscale(0.7); }
.arp-badge__icon {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-blue-dim);
  border-radius: 50%;
  color: var(--color-electric-blue);
  font-size: 1.5rem;
}
.arp-badge--earned .arp-badge__icon {
  background: var(--color-green-dim);
  color: var(--color-neon-green);
  box-shadow: 0 0 14px var(--color-green-glow);
}
.arp-badge__label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.78);
  font-weight: 500;
  line-height: 1.2;
}

/* ----- Star ratings ----- */
.arp-star {
  display: inline-block;
  color: rgba(255, 255, 255, 0.18);
  font-size: 0.875rem;
}
.arp-star--filled { color: var(--color-warning); }

/* ----- Parent report (when role=parent) ----- */
.arp-parent-report {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.arp-parent__header {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
}
.arp-parent__summary {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.5;
}
.arp-parent__skills {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.arp-parent__skill-row {
  display: grid;
  grid-template-columns: 140px 1fr 60px;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.875rem;
}
.arp-parent__skill-label { color: rgba(255, 255, 255, 0.78); }
.arp-parent__skill-value { color: var(--color-electric-blue); font-weight: 600; text-align: right; }
.arp-parent__grades {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.arp-parent__grade-chart { display: flex; flex-direction: column; gap: 0.375rem; }
.arp-parent__grade-bar {
  position: relative;
  height: 22px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 6px;
  overflow: hidden;
}
.arp-parent__grade-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-neon-green));
  transition: width 0.4s;
}
.arp-parent__grade-bar-label {
  position: absolute;
  left: 0.625rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  color: var(--color-white);
  font-weight: 600;
}
.arp-parent__grade-bar--active { box-shadow: 0 0 0 1px var(--color-electric-blue) inset; }
.arp-parent__canvas-section {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
}
.arp-parent__footer {
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.45);
  padding: 0.5rem 0 0.25rem;
}

/* ==========================================================================
   43. MISSIONS — HUD overlay + mission board cards + completion screens
   --------------------------------------------------------------------------
   .arp-hud is the in-mission floating HUD; .arp-mission-board is the dashboard
   mission grid. Both rendered by assets/js/missions.js.
   ========================================================================== */

.arp-hud {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: min(360px, calc(100vw - 2rem));
  background: rgba(10, 22, 40, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-blue-glow);
  border-radius: 14px;
  padding: 1rem 1.25rem;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.4);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
}
.arp-hud__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.arp-hud__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-hud__timer {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  color: var(--color-electric-blue);
}
.arp-hud__score {
  font-weight: 700;
  color: var(--color-neon-green);
}
.arp-hud__objectives {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.arp-hud__objective {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}
.arp-hud__objective:last-child { border-bottom: 0; }
.arp-hud__obj-text { flex: 1; }
.arp-hud__obj-pts { color: var(--color-warning); font-weight: 600; font-size: 0.8125rem; }
.arp-hud__actions { display: flex; gap: 0.5rem; }
.arp-hud__check,
.arp-hud__hint {
  flex: 1;
  padding: 0.5rem 0.875rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.8125rem;
  border-radius: 8px;
  cursor: pointer;
  border: 0;
}
.arp-hud__check {
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
}
.arp-hud__hint {
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.arp-hud__hint:hover { background: rgba(255, 255, 255, 0.08); }

/* ----- Mission Board (dashboard widget) ----- */
.arp-mission-board {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.arp-mission-board > h2,
.arp-mission-board > h3 {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-mission-board__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.875rem;
}
.arp-mission-board__empty {
  color: rgba(255, 255, 255, 0.55);
  font-style: italic;
  font-size: 0.9375rem;
}

/* ----- Mission Card ----- */
.arp-mission-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(0, 229, 255, 0.12);
  border-radius: 12px;
  padding: 1rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}
.arp-mission-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-blue-glow);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.12);
}
.arp-mission-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.arp-mission-card__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-mission-card__type {
  font-size: 0.6875rem;
  color: var(--color-electric-blue);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.arp-mission-card__stars { display: inline-flex; gap: 0.125rem; }
.arp-mission-card__difficulty {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: var(--color-blue-dim);
  color: var(--color-electric-blue);
}
.arp-mission-card__desc {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  line-height: 1.5;
}
.arp-mission-card__objectives {
  margin: 0;
  padding-left: 1.125rem;
  list-style-type: '▸ ';
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}
.arp-mission-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.25rem;
  padding-top: 0.5rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 0.8125rem;
}
.arp-mission-card__time { color: rgba(255, 255, 255, 0.55); }
.arp-mission-card__xp { color: var(--color-warning); font-weight: 600; }
.arp-mission-card__status {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.55);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.arp-mission-card__status--done { color: var(--color-neon-green); }

/* ----- Mission Complete screen ----- */
.arp-mission-complete,
.arp-mission-failed {
  background: var(--color-card-bg);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
  max-width: 480px;
  margin: 1rem auto;
}
.arp-mission-complete { border: 1px solid var(--color-green-glow); box-shadow: 0 12px 36px var(--color-green-dim); }
.arp-mission-failed { border: 1px solid rgba(255, 64, 96, 0.3); box-shadow: 0 12px 36px rgba(255, 64, 96, 0.1); }
.arp-mission-complete__header,
.arp-mission-failed__header { display: flex; flex-direction: column; align-items: center; gap: 0.375rem; }
.arp-mission-complete__badge {
  width: 88px;
  height: 88px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  border-radius: 50%;
  font-size: 2rem;
}
.arp-mission-complete__score,
.arp-mission-failed__score {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-white);
}
.arp-mission-complete__stars { display: inline-flex; gap: 0.25rem; font-size: 1.25rem; }
.arp-mission-complete__objectives {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
}
.arp-mission-complete__actions,
.arp-mission-failed__actions { display: flex; gap: 0.625rem; flex-wrap: wrap; justify-content: center; }
.arp-mission-failed__reason {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9375rem;
  line-height: 1.5;
}
.arp-badge-icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-green-dim);
  color: var(--color-neon-green);
  border-radius: 50%;
  font-size: 1rem;
}

/* ==========================================================================
   44. CAPSTONE — credential view + cohort showcase grid + venue chip
   --------------------------------------------------------------------------
   Emitted by assets/js/capstone.js. The credential card is the printable
   end-of-G12 deliverable; the showcase grid lists cohort submissions.
   ========================================================================== */

.cap-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.625rem 1.125rem;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.cap-btn--primary {
  background: linear-gradient(135deg, var(--color-electric-blue), var(--color-neon-green));
  color: var(--color-space-black);
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.25);
}
.cap-btn--primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0, 229, 255, 0.4); }
.cap-btn--secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.78);
}
.cap-btn--secondary:hover { background: rgba(255, 255, 255, 0.04); color: var(--color-white); }

.cap-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0 0 0.75rem;
  border-bottom: 1px solid var(--color-blue-dim);
  margin-bottom: 0.75rem;
}
.cap-card__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
}
.cap-card__badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-blue-dim);
  color: var(--color-electric-blue);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ----- Capstone credential (printable submission card) ----- */
.cap-credential__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem 0;
  border-bottom: 2px solid var(--color-blue-glow);
  margin-bottom: 1.25rem;
}
.cap-credential__eyebrow {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-electric-blue);
}
.cap-credential__title {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-white);
  line-height: 1.2;
}
.cap-credential__author {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
}
.cap-credential__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}
.cap-credential__section {
  margin: 1.25rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.cap-credential__section h3,
.cap-credential__section h4 {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-electric-blue);
}
.cap-credential__section p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* ----- Hero venue chip ----- */
.cap-hero__venue-chip {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: var(--color-green-dim);
  color: var(--color-neon-green);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ----- Cohort showcase grid (capstone-showcase.js fallback) ----- */
.cap-showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.cap-showcase-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-blue-dim);
  border-radius: 12px;
  padding: 1.125rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: pointer;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}
.cap-showcase-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-blue-glow);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.12);
}

/* Ensure print-friendly capstone credential renders cleanly to PDF */
@media print {
  .cap-credential__header { border-bottom-color: #000; }
  .cap-credential__title,
  .cap-credential__author,
  .cap-credential__meta,
  .cap-credential__section p { color: #000; }
  .cap-credential__eyebrow,
  .cap-credential__section h3,
  .cap-credential__section h4 { color: #555; }
  .cap-btn { display: none; }
}

/* ===========================================================================
 * §45 — 2026-05-09 — Lesson-embedded launchers + completion checklist + AI
 * tutor offline state + practice-lesson Pyodide panels.
 *
 * Added with the AI Robotics Plus final upgrade pass. Strictly additive —
 * no existing rules modified. All new chrome scopes are prefixed
 * `.discussion-`, `.build-lab-`, `.simulator-`, `.mission-completion-`,
 * `.code-comprehension`, `.code-rewrite`, `.btn-launch-`, `.btn-mark-complete`,
 * `.btn-discussion-`, `.check-`. Brand-coherent (cyan/lime accents on
 * deep navy, matching the existing course-player palette).
 * =========================================================================== */

/* ----- Build Lab + Simulator launcher cards (course.html lessons) ----- */
.build-lab-embed,
.simulator-embed {
  margin: 1rem 0;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.06), rgba(0, 255, 136, 0.04));
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 10px;
  text-align: center;
}
.build-lab-placeholder p,
.simulator-placeholder p {
  margin: 0.25rem 0;
  color: rgba(255, 255, 255, 0.85);
}
.build-lab-placeholder .build-icon,
.simulator-placeholder .sim-icon {
  font-size: 1.75rem;
  display: block;
  margin-bottom: 0.4rem;
}
.build-lab-desc,
.simulator-placeholder .sim-env {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
}
.btn-launch-build,
.btn-launch-sim,
.btn-launch-mission {
  margin-top: 0.65rem;
  padding: 0.55rem 1.15rem;
  background: linear-gradient(135deg, #00E5FF, #00FF88);
  color: #050A14;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: transform 0.12s, box-shadow 0.12s;
}
.btn-launch-build:hover,
.btn-launch-sim:hover,
.btn-launch-mission:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.35);
}

/* ----- Discussion activity (lesson-embedded ET+ tutor prompt) ----- */
.discussion-activity {
  margin: 1rem 0;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}
.discussion-activity .discussion-prompt {
  margin: 0 0 0.5rem;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  line-height: 1.55;
}
.discussion-activity .discussion-input {
  width: 100%;
  background: #0A0E27;
  color: #E0F7FA;
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
}
.discussion-activity .discussion-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.btn-discussion-submit,
.btn-discussion-portfolio {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-discussion-submit {
  background: linear-gradient(135deg, #00FF88, #00CC6A);
  color: #050A14;
}
.btn-discussion-portfolio {
  background: transparent;
  color: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-discussion-submit:hover { box-shadow: 0 4px 12px rgba(0, 255, 136, 0.35); }
.btn-discussion-portfolio:hover { border-color: rgba(0, 229, 255, 0.6); color: #fff; }
.btn-discussion-submit:disabled { opacity: 0.6; cursor: progress; }
.discussion-activity .discussion-ai-response {
  margin-top: 0.65rem;
  padding: 0.6rem 0.85rem;
  background: rgba(0, 229, 255, 0.08);
  border-left: 3px solid #00E5FF;
  border-radius: 4px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.55;
  display: none;
}
.discussion-activity .discussion-ai-response.visible { display: block; }
.discussion-activity .discussion-ai-response.discussion-hint {
  background: rgba(255, 209, 102, 0.10);
  border-left-color: #FFD166;
}
.discussion-activity .discussion-ai-response.discussion-offline {
  background: rgba(255, 100, 100, 0.08);
  border-left-color: #FF6B6B;
}
.discussion-portfolio-link {
  display: inline-block;
  margin-top: 0.4rem;
  color: #00FF88;
  text-decoration: none;
  font-weight: 600;
}
.discussion-portfolio-link:hover { text-decoration: underline; }

/* ----- Mission completion checklist (non-Python labs) ----- */
.mission-completion-checklist {
  margin: 1.5rem 0 0.5rem;
  padding: 1rem 1.25rem;
  background: rgba(0, 255, 136, 0.04);
  border: 1px solid rgba(0, 255, 136, 0.18);
  border-radius: 10px;
}
.mission-completion-checklist h4 {
  margin: 0 0 0.6rem;
  color: #00FF88;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}
.mission-completion-checklist .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.mission-completion-checklist .check-item {
  margin: 0.4rem 0;
}
.mission-completion-checklist .check-item label {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  line-height: 1.5;
  cursor: pointer;
}
.mission-completion-checklist .check-input {
  flex: 0 0 auto;
  margin-top: 0.2rem;
  accent-color: #00FF88;
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}
.mission-completion-checklist .check-item--done span {
  text-decoration: line-through;
  color: rgba(255, 255, 255, 0.4);
}
.mission-completion-checklist .check-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.65rem;
  flex-wrap: wrap;
}
.btn-mark-complete {
  padding: 0.5rem 1.1rem;
  background: rgba(0, 255, 136, 0.1);
  color: rgba(0, 255, 136, 0.6);
  border: 1px solid rgba(0, 255, 136, 0.3);
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: not-allowed;
  transition: background 0.18s, color 0.18s, transform 0.12s;
}
.btn-mark-complete:not(:disabled),
.btn-mark-complete--ready {
  background: linear-gradient(135deg, #00FF88, #00CC6A);
  color: #050A14;
  border-color: transparent;
  cursor: pointer;
}
.btn-mark-complete:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 255, 136, 0.35);
}
.mission-completion-checklist .check-status {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
}

/* ----- Practice-lesson Pyodide panels (code-comprehension + rewrite) ----- */
.code-comprehension,
.code-rewrite {
  margin: 0.85rem 0 0.5rem;
}
.code-comprehension-questions {
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  background: rgba(0, 229, 255, 0.05);
  border-left: 3px solid rgba(0, 229, 255, 0.5);
  border-radius: 4px;
}
.code-comprehension-questions h5 {
  margin: 0 0 0.5rem;
  color: #00E5FF;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}
.code-comprehension-questions .analysis-qa {
  margin: 0.35rem 0;
}
.rewrite-model-answer {
  margin-top: 0.85rem;
  padding: 0.6rem 0.85rem;
  background: rgba(255, 209, 102, 0.06);
  border-left: 3px solid rgba(255, 209, 102, 0.5);
  border-radius: 4px;
  font-size: 0.9rem;
}
.rewrite-model-answer summary {
  cursor: pointer;
  color: #FFD166;
  font-weight: 600;
}
.rewrite-model-answer p {
  margin-top: 0.5rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.55;
}

/* Mobile: collapse launcher cards to single-column */
@media (max-width: 600px) {
  .build-lab-embed,
  .simulator-embed {
    padding: 0.85rem 1rem;
  }
  .discussion-activity .discussion-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-discussion-submit,
  .btn-discussion-portfolio,
  .btn-mark-complete {
    width: 100%;
    text-align: center;
  }
}

/* prefers-reduced-motion: kill the lift transitions */
@media (prefers-reduced-motion: reduce) {
  .btn-launch-build,
  .btn-launch-sim,
  .btn-launch-mission,
  .btn-mark-complete:not(:disabled),
  .cap-showcase-card { transition: none; }
}

/* ===========================================================================
 * §46 — 2026-05-09b — Adaptive pacing chip (dashboard hint).
 * Ported from ai-steam-plus §pacing-chip. Fast / remediate / stay states
 * with brand-aligned green/orange/grey accents. Mounts via pacing-chip.js
 * which auto-injects below the welcome banner.
 * =========================================================================== */
.pacing-chip {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  padding: 0.85rem 1.1rem;
  margin: 1rem auto;
  max-width: 1200px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 4px solid #00FF88;
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.85);
}
.pacing-chip-fast       { border-left-color: #00FF88; }
.pacing-chip-remediate  { border-left-color: #FFA05C; }
.pacing-chip-stay       { border-left-color: #9AA6BD; }
.pacing-chip-icon {
  font-size: 1.4rem;
  line-height: 1.2;
  flex-shrink: 0;
}
.pacing-chip-body { flex: 1; min-width: 0; }
.pacing-chip-label {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin-bottom: 0.2rem;
  color: #FFFFFF;
}
.pacing-chip-reason {
  font-size: 0.85rem;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.6);
}
@media (prefers-contrast: more) {
  .pacing-chip-reason { color: #FFFFFF; }
}

/* ===========================================================================
 * §47 — 2026-05-09b — Streak + leaderboard widget (#4).
 * Mounts below the welcome banner / stats row on dashboard.html.
 * =========================================================================== */
.arp-streak-leaderboard {
  margin: 1.25rem auto;
  max-width: 1200px;
  padding: 0 1rem;
}
.arp-streak-leaderboard__row {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}
.arp-streak-card,
.arp-points-card {
  flex: 1;
  min-width: 200px;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.1rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}
.arp-streak-card { border-left: 3px solid #FF6B35; }
.arp-points-card { border-left: 3px solid #00E5FF; flex-direction: column; align-items: flex-start; gap: 0; }
.arp-streak-flame { font-size: 2rem; line-height: 1; }
.arp-streak-body { flex: 1; min-width: 0; }
.arp-streak-num,
.arp-points-num {
  font-size: 1.75rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1;
}
.arp-streak-label,
.arp-points-label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 4px;
}
.arp-streak-30 {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}
.arp-points-rank {
  margin-top: 6px;
  font-size: 0.85rem;
  color: #00FF88;
  font-weight: 600;
}
.arp-leaderboard {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
}
.arp-leaderboard-title {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  margin: 0 0 0.5rem;
}
.arp-leaderboard-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.arp-leaderboard-row {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
}
.arp-leaderboard-row:nth-child(odd) { background: rgba(255, 255, 255, 0.02); }
.arp-leaderboard-row--top { background: rgba(0, 255, 136, 0.06); }
.arp-leaderboard-rank {
  width: 24px;
  text-align: center;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
}
.arp-leaderboard-row--top .arp-leaderboard-rank { color: #00FF88; }
.arp-leaderboard-name {
  flex: 1;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.arp-leaderboard-pts {
  color: #00E5FF;
  font-weight: 600;
  font-size: 0.85rem;
}
.arp-leaderboard--empty p {
  margin: 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.88rem;
  text-align: center;
}

/* ===========================================================================
 * §48 — 2026-05-09b — Upcoming live classes card (#5).
 * =========================================================================== */
.arp-live-classes-card {
  margin: 1.25rem auto;
  max-width: 1200px;
  padding: 0.85rem 1.1rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}
.arp-live-classes-card--empty .arp-live-classes-empty {
  margin: 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.88rem;
}
.arp-live-classes-card__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 0 0 0.6rem;
}
.arp-live-classes-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.arp-live-class-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.6rem 0.7rem;
  margin-bottom: 0.4rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
}
.arp-live-class-platform { font-size: 1.4rem; flex-shrink: 0; }
.arp-live-class-body { flex: 1; min-width: 0; }
.arp-live-class-title {
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.arp-live-class-meta {
  display: flex;
  gap: 0.65rem;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 2px;
  flex-wrap: wrap;
}
.arp-live-class-rel {
  color: #00E5FF;
  font-weight: 600;
}
.arp-live-class-actions { display: flex; gap: 0.4rem; flex-shrink: 0; }
.arp-live-class-join,
.arp-live-class-cal {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
}
.arp-live-class-join {
  background: linear-gradient(135deg, #00E5FF, #00FF88);
  color: #050A14;
}
.arp-live-class-cal {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.75);
}
.arp-live-class-join:hover { box-shadow: 0 4px 12px rgba(0, 229, 255, 0.35); }
.arp-live-class-cal:hover { border-color: rgba(0, 229, 255, 0.6); color: #fff; }
@media (max-width: 540px) {
  .arp-live-class-row { flex-wrap: wrap; }
  .arp-live-class-actions { width: 100%; justify-content: flex-end; }
}

/* ===========================================================================
 * §49 — 2026-05-09b — Voice mode (#8) — TTS + STT toggle + buttons.
 * =========================================================================== */
.arp-voice-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 95;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.55);
  color: #FFFFFF;
  font-size: 1.05rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s, transform 0.12s;
}
.arp-voice-toggle:hover {
  background: rgba(0, 229, 255, 0.2);
  transform: scale(1.05);
}
.arp-voice-toggle[aria-pressed="true"] {
  background: rgba(0, 255, 136, 0.18);
  border-color: rgba(0, 255, 136, 0.6);
}
.arp-voice-tts-btn {
  margin-left: 0.5rem;
  padding: 0.2rem 0.4rem;
  background: transparent;
  color: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
  vertical-align: middle;
}
.arp-voice-tts-btn:hover { color: #00E5FF; border-color: rgba(0, 229, 255, 0.5); }
.arp-voice-tts-btn--speaking {
  background: rgba(0, 229, 255, 0.18);
  color: #00E5FF;
  border-color: #00E5FF;
}
.arp-voice-stt-btn {
  margin-top: 0.4rem;
  padding: 0.4rem 0.85rem;
  background: rgba(0, 229, 255, 0.12);
  color: #00E5FF;
  border: 1px solid rgba(0, 229, 255, 0.4);
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.arp-voice-stt-btn--listening {
  background: rgba(255, 107, 107, 0.18);
  color: #FF6B6B;
  border-color: #FF6B6B;
  animation: arp-voice-pulse 1.2s ease-in-out infinite;
}
@keyframes arp-voice-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.4); }
  50%      { box-shadow: 0 0 0 8px rgba(255, 107, 107, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .arp-voice-stt-btn--listening { animation: none; }
}
/* Hide voice toggle on tiny screens to avoid covering content */
@media (max-width: 380px) {
  .arp-voice-toggle { top: 8px; right: 8px; width: 32px; height: 32px; }
}

/* ===========================================================================
 * §50 — 2026-05-09b — Simulator 2D/3D toggle (#9).
 * =========================================================================== */
.sim-view-toggle {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  display: flex;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  overflow: hidden;
}
.sim-view-toggle__btn {
  background: transparent;
  color: rgba(255, 255, 255, 0.65);
  border: none;
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
}
.sim-view-toggle__btn:hover { color: #FFFFFF; }
.sim-view-toggle__btn--active {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.25), rgba(0, 255, 136, 0.25));
  color: #FFFFFF;
}
.sim-canvas-3d {
  width: 100%;
  height: 100%;
  min-height: 400px;
  background: #050A14;
}
.sim3d-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: rgba(255, 255, 255, 0.7);
  font-style: italic;
}
.sim3d-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: rgba(255, 255, 255, 0.65);
  text-align: center;
  padding: 2rem;
}

/* ===========================================================================
 * §51 — 2026-05-09c — #21 Lesson search command palette.
 * =========================================================================== */
.arp-search-btn {
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  margin: 0 auto 1rem;
  padding: 0.55rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 0.88rem;
  cursor: pointer;
}
.arp-search-btn kbd {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', monospace;
}
.arp-search-btn:hover { border-color: rgba(0, 229, 255, 0.4); color: #fff; }
.arp-search-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
}
.arp-search-backdrop[hidden] { display: none; }
.arp-search-modal {
  width: min(640px, calc(100vw - 32px));
  background: #0A0E27;
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 14px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}
#arp-search-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 1rem;
  padding: 1rem 1.25rem;
  outline: none;
}
.arp-search-results { max-height: 60vh; overflow-y: auto; }
.arp-search-empty {
  padding: 1rem 1.25rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.9rem;
}
.arp-search-list { list-style: none; margin: 0; padding: 0; }
.arp-search-item a {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.arp-search-item a:hover { background: rgba(0, 229, 255, 0.08); }
.arp-search-icon { font-size: 1.2rem; flex-shrink: 0; }
.arp-search-body { flex: 1; min-width: 0; }
.arp-search-title { color: #fff; font-weight: 600; font-size: 0.92rem; }
.arp-search-meta {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
  margin-top: 2px;
}
.arp-search-concept {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
  margin-top: 4px;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.arp-search-hint {
  padding: 0.5rem 1.25rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.arp-search-hint kbd {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
}

/* §52 — #23 End-of-lesson confidence poll */
.arp-confidence-host { margin: 1.25rem 0 0; }
.arp-confidence-poll {
  padding: 1rem 1.15rem;
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 10px;
}
.arp-confidence-q {
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.6rem;
  font-size: 0.92rem;
}
.arp-confidence-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.arp-confidence-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.5rem 0.65rem;
  min-width: 80px;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s;
}
.arp-confidence-btn:hover { transform: translateY(-1px); border-color: rgba(0, 229, 255, 0.5); }
.arp-confidence-btn--active {
  border-color: #00FF88;
  background: rgba(0, 255, 136, 0.12);
}
.arp-confidence-emoji { font-size: 1.6rem; line-height: 1; }
.arp-confidence-label { font-size: 0.72rem; color: rgba(255, 255, 255, 0.7); text-align: center; }
.arp-confidence-hint {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.55);
}
@media (prefers-reduced-motion: reduce) { .arp-confidence-btn { transition: none; } }

/* §53 — #26 Bookmarks + notes */
.arp-lesson-controls { margin: 1.5rem 0 1rem; }
.arp-lesson-controls__row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.65rem; }
.arp-bookmark-btn {
  display: inline-flex;
  gap: 0.4rem;
  align-items: center;
  padding: 0.45rem 0.95rem;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 0.86rem;
  cursor: pointer;
}
.arp-bookmark-btn--on {
  background: rgba(255, 209, 102, 0.15);
  color: #FFD166;
  border-color: rgba(255, 209, 102, 0.45);
}
.arp-notes-details {
  margin-top: 0.85rem;
  padding: 0.7rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}
.arp-notes-details summary {
  cursor: pointer;
  font-weight: 600;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.arp-notes-len {
  font-size: 0.74rem;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 400;
}
.arp-notes-textarea {
  width: 100%;
  margin-top: 0.6rem;
  min-height: 130px;
  background: #0A0E27;
  color: #E0F7FA;
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  resize: vertical;
}
.arp-notes-status {
  margin-top: 0.4rem;
  font-size: 0.74rem;
  color: rgba(255, 255, 255, 0.55);
}
.arp-bookmarks-card {
  margin: 1.25rem auto;
  max-width: 1200px;
  padding: 0.85rem 1.1rem;
  background: rgba(255, 209, 102, 0.06);
  border: 1px solid rgba(255, 209, 102, 0.18);
  border-radius: 10px;
}
.arp-bookmarks-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFD166;
  margin: 0 0 0.5rem;
}
.arp-bookmarks-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.arp-bookmark-link {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  text-decoration: none;
}
.arp-bookmark-link:hover { border-color: rgba(255, 209, 102, 0.5); color: #fff; }

/* §54 — #27 Skill-spine graph */
.arp-skillgraph-details {
  margin: 1rem auto;
  max-width: 1200px;
  padding: 0.85rem 1.1rem;
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 10px;
}
.arp-skillgraph-details summary {
  cursor: pointer;
  font-weight: 700;
  color: #00E5FF;
  font-size: 0.95rem;
}
.arp-skillgraph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 0.65rem 0;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.55);
}
.arp-skillgraph-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.arp-skillgraph-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.arp-skillgraph-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
}
.arp-skillgraph-cat {
  padding: 0.7rem 0.85rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
}
.arp-skillgraph-cat-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.4rem;
}
.arp-skillgraph-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.arp-skillgraph-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 0.74rem;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.02);
}
.arp-skillgraph-name { white-space: nowrap; }
.arp-skillgraph-empty { color: rgba(255, 255, 255, 0.55); font-size: 0.85rem; }

/* ============================================================
   AI Robotics Plus — Design-Challenge LLM grader (Batch 8 / Rec3)
   ============================================================ */
.arp-dc-panel {
  margin-top: 1.2rem;
  padding: 1.2rem;
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.04), rgba(0, 255, 136, 0.02));
  font-family: 'Inter', system-ui, sans-serif;
}
.arp-dc-header { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 0.4rem; }
.arp-dc-header h4 { margin: 0; font-size: 1rem; color: #E8F1FA; font-weight: 600; }
.arp-dc-badge {
  display: inline-block;
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #00E5FF, #00FF88);
  color: #050A14;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.arp-dc-hint { color: rgba(232, 241, 250, 0.78); font-size: 0.86rem; margin: 0.3rem 0 0.7rem; }
.arp-dc-reflection {
  width: 100%;
  padding: 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: #050A14;
  color: #E8F1FA;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.86rem;
  resize: vertical;
  min-height: 110px;
}
.arp-dc-reflection:focus { outline: 2px solid #00E5FF; outline-offset: 1px; }
.arp-dc-artefacts { margin-top: 0.6rem; }
.arp-dc-artefacts label { font-size: 0.82rem; color: rgba(232, 241, 250, 0.7); display: block; }
.arp-dc-artefact-url {
  width: 100%; margin-top: 0.3rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  background: #050A14; color: #E8F1FA;
  font-size: 0.84rem;
}
.arp-dc-actions { display: flex; align-items: center; gap: 0.8rem; margin-top: 0.8rem; }
.arp-dc-submit-btn {
  padding: 0.5rem 1.2rem;
  background: linear-gradient(135deg, #00E5FF, #00B274);
  color: #050A14;
  border: none;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.arp-dc-submit-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0, 229, 255, 0.4); }
.arp-dc-submit-btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; box-shadow: none; }
.arp-dc-status { font-size: 0.82rem; color: rgba(232, 241, 250, 0.78); }
.arp-dc-result { margin-top: 1rem; }
.arp-dc-score-row { display: flex; gap: 1rem; align-items: flex-start; margin-bottom: 0.8rem; }
.arp-dc-score-num {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #00FF88, #00E5FF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.arp-dc-score-denom { font-size: 1rem; color: rgba(232, 241, 250, 0.5); margin-left: 0.2rem; }
.arp-dc-summary { color: #E8F1FA; font-size: 0.9rem; line-height: 1.5; flex: 1; }
.arp-dc-crit-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.45rem; }
.arp-dc-crit {
  padding: 0.55rem 0.7rem;
  border-left: 3px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.02);
}
.arp-dc-crit--met { border-left-color: #00FF88; }
.arp-dc-crit--not-met { border-left-color: #FFC857; }
.arp-dc-crit-header { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; font-weight: 600; color: #E8F1FA; }
.arp-dc-crit-icon { width: 1.2rem; }
.arp-dc-crit--met .arp-dc-crit-icon { color: #00FF88; }
.arp-dc-crit--not-met .arp-dc-crit-icon { color: #FFC857; }
.arp-dc-crit-name { flex: 1; }
.arp-dc-crit-pts {
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: rgba(232, 241, 250, 0.85);
}
.arp-dc-crit-fb { margin: 0.3rem 0 0 0.5rem; font-size: 0.82rem; color: rgba(232, 241, 250, 0.72); }
.arp-dc-suggestions { margin-top: 0.9rem; padding: 0.6rem 0.8rem; background: rgba(0, 255, 136, 0.04); border-radius: 6px; }
.arp-dc-suggestions h5 { margin: 0 0 0.3rem; font-size: 0.78rem; color: #00FF88; text-transform: uppercase; letter-spacing: 0.1em; }
.arp-dc-suggestions ul { margin: 0; padding-left: 1.2rem; font-size: 0.84rem; color: rgba(232, 241, 250, 0.85); line-height: 1.5; }
.arp-dc-fallback { padding: 0.7rem; background: rgba(255, 138, 101, 0.06); border-left: 3px solid #FF8A65; border-radius: 4px; font-size: 0.85rem; color: rgba(232, 241, 250, 0.85); }
.arp-dc-fallback strong { color: #FF8A65; display: block; margin-bottom: 0.2rem; }
.arp-dc-err { padding: 0.5rem 0.7rem; background: rgba(239, 68, 68, 0.08); color: #FF8A65; border-radius: 4px; font-size: 0.82rem; }

/* =====================================================================
   §60 — EdTech Plus parent-brand corner logo
   Required by the mission-brief-playful-alpaca transformation:
   "EdTech Plus logo top-left every page header — hard rule across all
    grades, phases, and SKUs." 2026-05-15 Wave 5.
   ===================================================================== */

.etp-corner-logo {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: rgba(5, 10, 20, 0.88);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(150, 211, 95, 0.28);
  border-radius: 10px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}
.etp-corner-logo:hover,
.etp-corner-logo:focus-visible {
  border-color: rgba(150, 211, 95, 0.65);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(150, 211, 95, 0.18);
  outline: none;
}
.etp-corner-logo:focus-visible {
  outline: 2px solid #96D35F;
  outline-offset: 2px;
}
.etp-corner-logo svg {
  height: 22px;
  width: auto;
  display: block;
}
@media (max-width: 640px) {
  .etp-corner-logo {
    top: 8px;
    left: 8px;
    padding: 3px 8px;
  }
  .etp-corner-logo svg { height: 18px; }
}
@media print {
  .etp-corner-logo {
    position: static;
    background: transparent;
    border-color: rgba(0, 0, 0, 0.3);
  }
}
/* When a page has a left sidebar that includes its own course-level
   logo (dashboard.html sidebar__logo), nudge the corner logo right
   so the two don't overlap visually. */
.dashboard-layout .etp-corner-logo,
.lab-layout .etp-corner-logo,
.sim-layout .etp-corner-logo {
  left: 280px;
}
@media (max-width: 1024px) {
  .dashboard-layout .etp-corner-logo,
  .lab-layout .etp-corner-logo,
  .sim-layout .etp-corner-logo {
    left: 12px;
  }
}