/* ===== Landing Page Styles ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a1a;
  --bg-card: #12122a;
  --bg-elevated: #1a1a3a;
  --text: #e8e8f0;
  --text-dim: #8892a8;
  --text-muted: #5a6478;
  --accent: #00AAFF;
  --accent-glow: rgba(0, 170, 255, 0.15);
  --pink: #E91E90;
  --purple: #9B59B6;
  --success: #2ECC71;
  --warning: #F39C12;
  --danger: #E74C3C;
  --radius: 16px;
  --radius-sm: 10px;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.gradient-text {
  background: linear-gradient(135deg, #00AAFF, #E91E90);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0088DD);
  color: white;
  box-shadow: 0 4px 20px rgba(0,170,255,0.3);
}
.btn-primary:hover {
  box-shadow: 0 6px 30px rgba(0,170,255,0.5);
  transform: translateY(-2px);
}
.btn-secondary {
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-2px);
}
.btn-large {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius);
}

/* ===== Navigation ===== */
.landing-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10,10,26,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #00AAFF, #E91E90);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-logo-img { width: 32px; height: 32px; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  background: linear-gradient(135deg, var(--accent), #0088DD) !important;
  color: white !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}
.nav-bmc {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFDD00 !important;
  color: #000 !important;
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-weight: 700 !important;
  font-size: 0.85rem !important;
  transition: all 0.2s;
}
.nav-bmc:hover {
  background: #ffce00 !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255,221,0,0.4);
}
.nav-cta:hover { box-shadow: 0 4px 16px rgba(0,170,255,0.4); }
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 8px;
}

/* ===== Hero ===== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 140px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(155,89,182,0.15);
  color: var(--purple);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 40px;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
}
.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Hero mock card */
.hero-visual { display: flex; justify-content: center; }
.mock-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 40px 32px;
  width: 100%;
  max-width: 400px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.mock-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--pink));
  border-radius: var(--radius) var(--radius) 0 0;
}
.mock-card-type {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 16px;
}
.mock-card-question {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 28px;
}
.mock-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mock-option {
  padding: 14px 18px;
  background: rgba(255,255,255,0.03);
  border: 2px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  text-align: left;
  transition: all 0.3s;
}
.mock-option.correct {
  border-color: var(--success);
  background: rgba(46,204,113,0.12);
  color: var(--success);
}

/* ===== Sections ===== */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 100px 0; }
.section-badge {
  display: inline-block;
  background: rgba(0,170,255,0.12);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}
section h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-subtitle {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 48px;
}

/* ===== Features Grid ===== */
.features { background: var(--bg); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.2s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
  border-color: rgba(0,170,255,0.15);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-icon.ai-icon { background: rgba(155,89,182,0.15); color: var(--purple); }
.feature-icon.srs-icon { background: rgba(233,30,144,0.15); color: var(--pink); }
.feature-icon.grade-icon { background: rgba(46,204,113,0.15); color: var(--success); }
.feature-icon.tutor-icon { background: rgba(155,89,182,0.15); color: var(--purple); }
.feature-icon.sync-icon { background: rgba(243,156,18,0.15); color: var(--warning); }
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== How It Works ===== */
.how-it-works { background: var(--bg-card); }
.steps {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 48px;
}
.step {
  flex: 1;
  text-align: center;
  padding: 32px 24px;
}
.step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--pink));
  color: white;
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.step h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.step p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}
.step-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ===== SRS Stages ===== */
.srs-section { background: var(--bg); }
.srs-stages {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-top: 48px;
}
.srs-stage-card {
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius);
  padding: 24px 12px;
  text-align: center;
  transition: all 0.2s;
}
.srs-stage-card:hover { transform: translateY(-4px); }
.stage-label {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.stage-interval {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.stage-new { border-color: rgba(46,204,113,0.3); }
.stage-new .stage-label { color: var(--success); }
.stage-hatchling { border-color: rgba(233,30,144,0.3); }
.stage-hatchling .stage-label { color: var(--pink); }
.stage-fledgling { border-color: rgba(136,45,158,0.3); }
.stage-fledgling .stage-label { color: #882D9E; }
.stage-hunter { border-color: rgba(41,77,219,0.3); }
.stage-hunter .stage-label { color: #294DDB; }
.stage-sage { border-color: rgba(0,147,221,0.3); }
.stage-sage .stage-label { color: #0093DD; }
.stage-elder { border-color: rgba(134,134,134,0.3); }
.stage-elder .stage-label { color: #868686; }

/* ===== Demo Video ===== */
.demo-section { background: var(--bg-card); }
.demo-video-wrap {
  margin-top: 48px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.08);
}
.demo-video {
  width: 100%;
  display: block;
  background: #000;
  max-height: 600px;
}

/* ===== Themed AI Tutor ===== */
.tutor-section { background: var(--bg); }
.tutor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.tutor-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.2s;
}
.tutor-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.tutor-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.tutor-emoji { font-size: 1.8rem; }
.tutor-card h3 { font-size: 1.1rem; font-weight: 700; }
.tutor-card p { color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; }

/* Extension highlights */
.extension-highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0;
}
.ext-highlight {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.ext-highlight-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.ext-highlight strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 2px;
}
.ext-highlight span {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
}
.extension-text p {
  margin-bottom: 12px;
}

/* ===== Languages (removed, kept for compat) ===== */
.lang-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 48px;
}
.lang-chip {
  padding: 10px 24px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
}
.lang-chip:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.lang-chip.highlight {
  background: var(--accent-glow);
  border-color: rgba(0,170,255,0.3);
  color: var(--accent);
  font-weight: 600;
}

/* ===== Extension Section ===== */
.extension-section { background: var(--bg); }
.extension-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.extension-text p {
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 28px;
}
.yt-mock {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.yt-mock-bar {
  height: 8px;
  background: linear-gradient(90deg, #FF0000 60%, rgba(255,255,255,0.1) 60%);
}
.yt-mock-content { padding: 24px; }
.yt-mock-player {
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-sm);
  height: 160px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.yt-mock-player::after {
  content: '';
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,0,0,0.8);
  clip-path: polygon(35% 20%, 80% 50%, 35% 80%);
}
.yt-mock-popup {
  background: var(--bg-elevated);
  border: 1px solid rgba(0,170,255,0.2);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}
.yt-popup-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.yt-popup-q {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, rgba(0,170,255,0.08), rgba(233,30,144,0.08));
  text-align: center;
}
.cta-section p {
  color: var(--text-dim);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 60px 0 0;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
}
.footer-brand { max-width: 300px; }
.footer-logo { width: 40px; height: 40px; vertical-align: middle; margin-right: 8px; }
.footer-name {
  font-size: 1.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #00AAFF, #E91E90);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 8px;
}
.footer-links {
  display: flex;
  gap: 60px;
}
.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 8px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding: 20px 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 120px; gap: 40px; }
  .hero h1 { font-size: 2.5rem; }
  .hero-visual { order: -1; }
  .mock-card { max-width: 360px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .srs-stages { grid-template-columns: repeat(3, 1fr); }
  .extension-content { grid-template-columns: 1fr; }
  .tutor-grid { grid-template-columns: 1fr; }
  .footer-container { flex-direction: column; }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,10,26,0.95);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-links.open { display: flex; }
  .mobile-menu-btn { display: block; }
  .hero h1 { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-actions { flex-direction: column; }
  .hero-stats { gap: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  section h2 { font-size: 1.8rem; }
  .srs-stages { grid-template-columns: repeat(2, 1fr); }
  .lang-grid { gap: 8px; }
  .lang-chip { padding: 8px 16px; font-size: 0.8rem; }
}