@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300..900;1,14..32,300..900&family=JetBrains+Mono:ital,wght@0,400..700;1,400..700&family=Plus+Jakarta+Sans:ital,wght@0,400..800;1,400..800&display=swap');

:root {
  color-scheme: light;
  
  /* Primary & Brand Palette (Aligned with mobile app) */
  --primary: #1e40af;        /* Deep Royal Blue */
  --primary-light: #3b82f6;  /* Electric / Sky Blue */
  --primary-dark: #1e3a8a;   /* Deep Navy */
  --primary-subtle: #eff6ff; /* Pale Blue Tint */
  --primary-glow: rgba(30, 64, 175, 0.18);
  
  --secondary: #0ea5e9;      /* Sky Blue */
  --secondary-light: #38bdf8;
  --secondary-subtle: #f0f9ff;
  
  --accent: #ff7316;         /* Saffron Energy Orange */
  --accent-light: #fb923c;
  --accent-subtle: #fff7ed;
  
  --success: #10b981;
  --success-subtle: #ecfdf5;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  /* Neutrals & Surfaces */
  --ink-950: #090d16;
  --ink-900: #0f172a;
  --ink-800: #1e293b;
  --ink-700: #334155;
  --ink-600: #475569;
  --ink-500: #64748b;
  --ink-400: #94a3b8;
  --ink-300: #cbd5e1;
  --ink-200: #e2e8f0;
  --ink-100: #f1f5f9;
  --ink-50:  #f8fafc;
  --white:   #ffffff;
  
  /* Borders & Shadows */
  --border-light: rgba(226, 232, 240, 0.85);
  --border-hover: rgba(59, 130, 246, 0.35);
  --border-dark:  rgba(255, 255, 255, 0.1);
  
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 40px -8px rgba(15, 23, 42, 0.12);
  --shadow-xl: 0 24px 60px -12px rgba(15, 23, 42, 0.16);
  --shadow-glow: 0 10px 30px rgba(30, 64, 175, 0.22);
  
  /* Radii - Modern & Refined */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  
  /* Typography */
  --sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: 'JetBrains Mono', SFMono-Regular, Consolas, monospace;
  
  /* Layout */
  --shell-max: 1240px;
  --nav-height: 72px;
}

/* ==========================================================================
   CSS Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-800);
  background-color: var(--ink-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
}

body {
  overflow-x: hidden;
  background-color: var(--ink-50);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

/* ==========================================================================
   Typography & Utilities
   ========================================================================== */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.t-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.18);
  margin-bottom: 16px;
}

.t-tag--accent {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: rgba(255, 115, 22, 0.2);
}

.t-tag--dark {
  background: rgba(255, 255, 255, 0.08);
  color: #93c5fd;
  border-color: rgba(255, 255, 255, 0.15);
}

.t-h1 {
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--ink-950);
}

.t-h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--ink-950);
}

.t-h3 {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--ink-950);
}

.t-lead {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.65;
  color: var(--ink-600);
}

/* ==========================================================================
   Modern Buttons (Refined, Non-Pill, Tactile)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  white-space: nowrap;
}

.btn svg {
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn:hover svg {
  transform: translateX(3px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 14px rgba(30, 64, 175, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2563eb 0%, var(--primary) 100%);
  box-shadow: 0 8px 24px rgba(30, 64, 175, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.3);
}

.btn-secondary {
  background: var(--white);
  color: var(--ink-800);
  border-color: var(--ink-200);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: var(--ink-50);
  color: var(--primary);
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-600);
  border-color: transparent;
}

.btn-ghost:hover {
  background: rgba(15, 23, 42, 0.04);
  color: var(--ink-950);
}

.btn-lg {
  padding: 14px 24px;
  font-size: 15.5px;
  border-radius: var(--radius-md);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Header / Sticky Navigation Bar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  transition: all 0.25s ease;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-sm);
}

.site-header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 19px;
  font-weight: 800;
  color: var(--ink-950);
  letter-spacing: -0.02em;
}

.brand-link img {
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xs);
}

.brand-link span span {
  color: var(--primary);
}

.brand-badge {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink-600);
  transition: color 0.15s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.burger-btn {
  display: none;
  background: none;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-sm);
  padding: 8px;
  color: var(--ink-700);
  cursor: pointer;
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  background: var(--white);
  box-shadow: var(--shadow-xl);
  z-index: 200;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-drawer.open {
  right: 0;
}

.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 190;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer .nav-link {
  font-size: 17px;
  padding: 10px 0;
  border-bottom: 1px solid var(--ink-100);
}

.drawer-close-btn {
  align-self: flex-end;
  background: none;
  border: none;
  color: var(--ink-500);
  cursor: pointer;
  padding: 4px;
  margin-bottom: 12px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  padding: 72px 0 64px;
  overflow: hidden;
}

.hero-glow-bg {
  position: absolute;
  top: -140px;
  left: 50%;
  transform: translateX(-50%);
  width: 1050px;
  height: 520px;
  background: radial-gradient(50% 50% at 50% 50%, rgba(59, 130, 246, 0.16) 0%, rgba(14, 165, 233, 0.06) 50%, rgba(248, 250, 252, 0) 100%);
  z-index: 0;
  pointer-events: none;
  animation: ambientGlow 12s ease-in-out infinite alternate;
}

@keyframes ambientGlow {
  0% { transform: translateX(-50%) scale(0.96); opacity: 0.75; }
  50% { transform: translateX(-48%) scale(1.04); opacity: 1; }
  100% { transform: translateX(-52%) scale(0.98); opacity: 0.85; }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 14px;
  background: var(--white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  border-radius: var(--radius-md);
  color: var(--ink-700);
  margin-bottom: 24px;
}

.hero-tag__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(1.1rem, 1.4vw, 1.25rem);
  line-height: 1.6;
  color: var(--ink-600);
  max-width: 780px;
  margin: 0 auto 36px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

/* ==========================================================================
   Interactive Product Simulator (Centerpiece)
   ========================================================================== */
.simulator-wrap {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  max-width: 1120px;
}

.sim-window {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(30, 64, 175, 0.05);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sim-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: #f8fafc;
  border-bottom: 1px solid var(--ink-200);
  gap: 16px;
}

.sim-dots {
  display: flex;
  gap: 6px;
}

.sim-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.sim-dot--red { background: #ef4444; }
.sim-dot--yellow { background: #f59e0b; }
.sim-dot--green { background: #10b981; }

.sim-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.sim-tab {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-600);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.sim-tab:hover {
  background: var(--ink-100);
  color: var(--ink-950);
}

.sim-tab.active {
  background: var(--white);
  color: var(--primary);
  border-color: var(--ink-200);
  box-shadow: var(--shadow-xs);
}

.sim-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-500);
  white-space: nowrap;
}

.sim-status-ping {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  animation: pulsePing 2s infinite;
}

@keyframes pulsePing {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Simulator Body Split View */
.sim-body {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  min-height: 480px;
}

.sim-left {
  padding: 24px;
  border-right: 1px solid var(--ink-200);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #ffffff;
}

.sim-chat-thread {
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  max-height: 380px;
  padding-right: 8px;
}

.sim-msg {
  display: flex;
  gap: 12px;
  animation: fadeIn 0.3s ease;
}

.sim-msg__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.sim-msg__avatar--ai {
  background: var(--primary);
  color: #ffffff;
}

.sim-msg__avatar--user {
  background: #f1f5f9;
  color: var(--ink-700);
}

.sim-msg__bubble {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.55;
  max-width: 90%;
}

.sim-msg--ai .sim-msg__bubble {
  background: #f8fafc;
  border: 1px solid var(--ink-200);
  color: var(--ink-800);
}

.sim-msg--user .sim-msg__bubble {
  background: var(--primary-subtle);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--primary-dark);
}

.sim-voice-bar {
  margin-top: 18px;
  padding: 12px 16px;
  background: #f8fafc;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sim-waveform {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 20px;
}

.wave-bar {
  width: 3px;
  background: var(--primary);
  border-radius: 2px;
  animation: wavePulse 1.2s ease-in-out infinite alternate;
}

.wave-bar:nth-child(1) { height: 8px; animation-delay: 0.1s; }
.wave-bar:nth-child(2) { height: 16px; animation-delay: 0.3s; }
.wave-bar:nth-child(3) { height: 12px; animation-delay: 0.2s; }
.wave-bar:nth-child(4) { height: 20px; animation-delay: 0.5s; }
.wave-bar:nth-child(5) { height: 10px; animation-delay: 0.4s; }
.wave-bar:nth-child(6) { height: 18px; animation-delay: 0.2s; }
.wave-bar:nth-child(7) { height: 6px; animation-delay: 0.6s; }

@keyframes wavePulse {
  0% { transform: scaleY(0.4); }
  100% { transform: scaleY(1); }
}

/* Simulator Right Side (Live Canvas & Telemetry) */
.sim-right {
  padding: 24px;
  background: #090d16;
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sim-canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.sim-canvas-title {
  font-family: var(--mono);
  font-size: 11.5px;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sim-canvas-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}

.sim-telemetry {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11.5px;
  color: #94a3b8;
}

/* ==========================================================================
   Section: Stats Bar / Impact Counters
   ========================================================================== */
.stats-bar {
  padding: 48px 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  background: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: clamp(2.2rem, 3.2vw, 3rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-600);
}

/* ==========================================================================
   Section: Education 4.0 Paradigm Shift
   ========================================================================== */
.shift-section {
  padding: 96px 0;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.shift-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.shift-card {
  padding: 36px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.shift-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.shift-card--modern {
  background: linear-gradient(145deg, #0f172a 0%, #1e3a8a 100%);
  color: #ffffff;
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(30, 64, 175, 0.2);
}

.shift-card--modern h3 {
  color: #ffffff;
}

.shift-card--modern p {
  color: #cbd5e1;
}

.shift-list {
  list-style: none;
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.shift-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.5;
}

.shift-list--legacy li svg {
  color: #ef4444;
  flex-shrink: 0;
  margin-top: 2px;
}

.shift-list--modern li svg {
  color: #34d399;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   Section: The 9 AI Pedagogical Personas
   ========================================================================== */
.modes-section {
  padding: 96px 0;
  background: #f8fafc;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.mode-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mode-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.mode-card:hover::before {
  opacity: 1;
}

.mode-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.mode-card__num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-400);
}

.mode-card__pedagogy {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

.mode-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 8px;
}

.mode-card p {
  font-size: 14px;
  color: var(--ink-600);
  line-height: 1.55;
}

.mode-card__footer {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--ink-100);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-500);
}

.mode-card__footer svg {
  color: var(--primary);
}

/* ==========================================================================
   Section: Closed-Loop Remediation Engine (Dark Slate)
   ========================================================================== */
.remediation-section {
  padding: 96px 0;
  background: #090d16;
  color: #ffffff;
}

.remediation-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.remediation-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.rem-step {
  display: flex;
  gap: 20px;
  padding: 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  cursor: pointer;
  position: relative;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.rem-step:hover, .rem-step.active {
  background: rgba(30, 64, 175, 0.18);
  border-color: rgba(59, 130, 246, 0.5);
  transform: translateX(6px);
  box-shadow: 0 4px 20px rgba(30, 64, 175, 0.2);
}

.rem-step__num {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--mono);
  flex-shrink: 0;
}

.rem-step__content h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.rem-step__content p {
  font-size: 14px;
  color: #94a3b8;
  line-height: 1.5;
}

.telemetry-card {
  background: #0f172a;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.telemetry-log {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: #cbd5e1;
}

/* ==========================================================================
   Section: Multimodal Tools & Vernacular
   ========================================================================== */
.tools-section {
  padding: 96px 0;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.tool-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-preview {
  min-height: 140px;
  border-radius: var(--radius-md);
  background: #0f172a;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.tool-card h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 14px;
  color: var(--ink-600);
  line-height: 1.55;
}

/* ==========================================================================
   Section: Stakeholders & Schools
   ========================================================================== */
.stakeholders-section {
  padding: 96px 0;
  background: #f8fafc;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.stakeholder-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.stakeholder-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.stakeholder-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.stakeholder-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.stakeholder-card:hover::before {
  opacity: 1;
}

.stakeholder-card--featured {
  background: linear-gradient(145deg, #1e3a8a 0%, #0f172a 100%);
  color: #ffffff;
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(30, 64, 175, 0.2);
}

.stakeholder-card--featured h3 {
  color: #ffffff;
}

.stakeholder-card--featured p {
  color: #cbd5e1;
}

.stakeholder-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.badge-student { background: var(--primary-subtle); color: var(--primary); }
.badge-teacher { background: rgba(59, 130, 246, 0.25); color: #93c5fd; }
.badge-school  { background: var(--accent-subtle); color: var(--accent); }

/* ==========================================================================
   Section: Demo Video Cinema Showcase
   ========================================================================== */
.demo-section {
  padding: 96px 0;
  background: #090d16;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.demo-section::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 450px;
  background: radial-gradient(circle, rgba(30, 64, 175, 0.22) 0%, rgba(14, 165, 233, 0.06) 50%, transparent 70%);
  pointer-events: none;
}

.demo-cinema {
  max-width: 960px;
  margin: 0 auto;
}

.demo-video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #0f172a;
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.7), 0 0 40px rgba(30, 64, 175, 0.2);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.demo-video-wrapper:hover {
  border-color: rgba(59, 130, 246, 0.45);
  box-shadow: 0 28px 70px -12px rgba(0, 0, 0, 0.8), 0 0 50px rgba(30, 64, 175, 0.3);
}

.demo-video-frame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.demo-chapters-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 32px;
}

.demo-chapter-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-lg);
  transition: all 0.25s ease;
}

.demo-chapter-item:hover {
  background: rgba(30, 64, 175, 0.15);
  border-color: rgba(59, 130, 246, 0.35);
  transform: translateY(-2px);
}

.chapter-badge {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-light);
  background: rgba(59, 130, 246, 0.15);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.demo-chapter-item strong {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.demo-chapter-item p {
  font-size: 12px;
  color: #94a3b8;
  line-height: 1.45;
  margin: 0;
}

@media (max-width: 1024px) {
  .demo-chapters-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .demo-chapters-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Section: Testimonials
   ========================================================================== */
.testimonials-section {
  padding: 96px 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.test-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.test-card p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-700);
  margin-bottom: 20px;
}

.test-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.test-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-subtle);
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
}

.test-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink-950);
}

.test-role {
  font-size: 12.5px;
  color: var(--ink-500);
}

/* ==========================================================================
   Section: Contact Form
   ========================================================================== */
.contact-section {
  padding: 96px 0;
  background: #f8fafc;
  border-top: 1px solid var(--border-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: flex-start;
}

.contact-form-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-800);
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 14.5px;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  background: #f8fafc;
  color: var(--ink-950);
  transition: all 0.2s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.12);
}

.form-textarea {
  min-height: 110px;
  resize: vertical;
}

.contact-info-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact-item svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: #090d16;
  color: #94a3b8;
  padding: 72px 0 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  margin-top: 12px;
  color: #64748b;
  max-width: 320px;
}

.footer h5 {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--mono);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 14px;
  color: #94a3b8;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-socials {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-social-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #cbd5e1;
  transition: all 0.2s ease;
}

.footer-social-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: #64748b;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

.footer-legal-links a:hover {
  color: #ffffff;
}

/* ==========================================================================
   Subtle Scroll Reveal & Animations
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll To Top Button */
.scroll-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--white);
  border: 1px solid var(--ink-200);
  box-shadow: var(--shadow-md);
  color: var(--ink-700);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: all 0.25s ease;
  z-index: 90;
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .modes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stakeholder-grid, .tools-grid, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .sim-body {
    grid-template-columns: 1fr;
  }
  .sim-left {
    border-right: none;
    border-bottom: 1px solid var(--ink-200);
  }
  .remediation-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }
  .nav-links, .nav-actions .btn {
    display: none;
  }
  .burger-btn {
    display: block;
  }
  .hero {
    padding: 48px 0;
  }
  .hero-sub {
    font-size: 1rem;
  }
  .shift-grid, .modes-grid, .stakeholder-grid, .tools-grid, .testimonials-grid, .stats-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}