/* Mobile Interface Heritage Archive — Styles */

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

:root {
  --bg: #faf9f6;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #555566;
  --accent: #e94560;
  --accent-dark: #c23152;
  --border: #e2e0db;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 10px;
  --radius-sm: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --max-width: 1100px;
  --transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12121a;
    --surface: #1e1e2a;
    --text: #e8e8ec;
    --text-secondary: #a0a0b0;
    --border: #2e2e3a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  }
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}

.logo-icon {
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  gap: 20px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Hero */
.hero-section {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 48px 20px 40px;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--text);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 24px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Timeline Section */
.timeline-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filter-btn {
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Timeline Controls */
.timeline-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.timeline-nav-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-nav-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.timeline-scrubber {
  flex: 1;
  min-width: 200px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.scrubber-track {
  position: relative;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin-bottom: 8px;
}

.scrubber-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.1s ease;
}

.scrubber-handle {
  position: absolute;
  top: 50%;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border: 3px solid var(--surface);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: var(--shadow-md);
  cursor: grab;
  transition: left 0.1s ease;
}

.scrubber-handle:active {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.15);
}

.scrubber-years {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.current-year-display {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
  min-width: 70px;
  text-align: center;
}

/* Features Grid */
.timeline-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.feature-card .card-maker {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-card .card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card .card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.feature-card .card-year {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 10px;
  font-style: italic;
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Timeline Actions */
.timeline-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Feature Detail Panel */
.feature-detail {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  z-index: 200;
}

.feature-detail[hidden] {
  display: none;
}

.detail-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
}

.detail-close:hover {
  color: var(--accent);
}

.feature-detail h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.detail-manufacturer {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  font-weight: 600;
}

.detail-year {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.detail-description {
  font-size: 0.95rem;
  margin-bottom: 10px;
  line-height: 1.6;
}

.detail-impact {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

/* Overlay */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 199;
}

/* Supporting Content */
.supporting-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px;
}

.supporting-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.support-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.support-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.support-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Scenario Section */
.scenario-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.scenario-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.scenario-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.scenario-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.scenario-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Troubleshooting */
.troubleshooting-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.troubleshooting-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.troubleshoot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.troubleshoot-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.troubleshoot-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.troubleshoot-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 28px 20px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.footer-version {
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* Share Toast */
.share-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 0.85rem;
  z-index: 300;
  box-shadow: var(--shadow-md);
  transition: opacity 0.3s ease;
}

.share-toast[hidden] {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-stats {
    gap: 20px;
  }

  .stat-number {
    font-size: 1.2rem;
  }

  .timeline-controls {
    gap: 8px;
  }

  .current-year-display {
    font-size: 1.4rem;
    min-width: 50px;
  }

  .timeline-features {
    grid-template-columns: 1fr;
  }

  .support-grid,
  .scenario-list,
  .troubleshoot-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    gap: 6px;
  }

  .filter-btn {
    padding: 6px 12px;
    font-size: 0.78rem;
  }

  .feature-detail {
    padding: 24px 20px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 12px;
  }

  .logo-text {
    font-size: 0.9rem;
  }

  .hero-section {
    padding: 32px 12px 28px;
  }

  .timeline-section {
    padding: 28px 12px;
  }

  .supporting-content,
  .scenario-section,
  .troubleshooting-section {
    padding-left: 12px;
    padding-right: 12px;
  }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}