:root {
  --bg: #f5f8fb;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --border: #dbe4ea;
  --border-strong: #c7d4dd;
  --text: #17212b;
  --text-muted: #64748b;
  --primary: #075985;
  --primary-hover: #0369a1;
  --accent: #0f766e;
  --danger: #b91c1c;
  --warning: #a16207;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans TC",
    "Microsoft JhengHei",
    sans-serif;
  background:
    radial-gradient(circle at top, rgba(14, 165, 233, 0.08), transparent 34rem),
    var(--bg);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand-emoji {
  font-size: 22px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--text-muted);
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--primary);
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 54px 22px 72px;
}

.hero {
  text-align: center;
  margin-bottom: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.hero-stats {
  margin: 18px 0 0;
  color: var(--text-muted);
  font-size: 16px;
}

.search-panel {
  margin: 0 auto 16px;
}

.search-form {
  display: flex;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow);
}

.search-form input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  padding: 16px 18px;
  font-size: 17px;
  color: var(--text);
  background: transparent;
}

.search-form input::placeholder {
  color: #9aa7b5;
}

.search-form button {
  border: 0;
  border-radius: 13px;
  padding: 0 28px;
  background: var(--primary);
  color: white;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition:
    background 0.15s ease,
    transform 0.15s ease;
}

.search-form button:hover {
  background: var(--primary-hover);
}

.search-form button:active {
  transform: translateY(1px);
}

.search-form button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.message {
  min-height: 24px;
  margin: 12px 4px 0;
  color: var(--text-muted);
  font-size: 14px;
}

.message.error {
  color: var(--danger);
}

.message.warning {
  color: var(--warning);
}

.message.empty {
  color: var(--text-muted);
}

.disclaimer {
  margin: 18px 0 24px;
  padding: 14px 16px;
  border: 1px solid #cfe1ea;
  background: #eef7fb;
  color: #355365;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.7;
}

.summary {
  margin: 28px 0 16px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}

.results {
  display: grid;
  gap: 18px;
}

.video-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  overflow: hidden;
}

.video-main {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  padding: 18px;
}

.thumbnail-link {
  display: block;
  border-radius: 14px;
  overflow: hidden;
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.thumbnail {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.video-info {
  min-width: 0;
}

.video-title {
  margin: 0 0 12px;
  font-size: 20px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.video-title a:hover {
  color: var(--primary);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--text-muted);
  font-size: 14px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.youtube-link {
  color: var(--primary);
  font-weight: 700;
}

.youtube-link:hover {
  text-decoration: underline;
}

.matches {
  border-top: 1px solid var(--border);
  background: #fbfdff;
  padding: 8px 18px 18px;
}

.match-list {
  display: grid;
  gap: 8px;
}

.match-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 14px;
  align-items: start;
  padding: 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text);
  background: transparent;
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.match-row:hover {
  background: white;
  border-color: var(--border-strong);
}

.time-badge {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 78px;
  padding: 5px 8px;
  border-radius: 999px;
  background: #e0f2fe;
  color: #075985;
  font-size: 13px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.match-text {
  line-height: 1.75;
  color: #243241;
}

.toggle-button {
  margin-top: 12px;
  border: 1px solid var(--border-strong);
  background: white;
  color: var(--primary);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  cursor: pointer;
}

.toggle-button:hover {
  border-color: var(--primary);
}

.empty-state {
  padding: 28px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-muted);
  text-align: center;
}

.footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 22px 40px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 720px) {
  .navbar {
    padding: 14px 16px;
  }

  .nav-links {
    gap: 14px;
  }

  .page {
    padding: 40px 16px 56px;
  }

  .search-form {
    flex-direction: column;
  }

  .search-form button {
    height: 52px;
  }

  .video-main {
    grid-template-columns: 1fr;
  }

  .match-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .time-badge {
    justify-content: flex-start;
  }
}

.videos-hero {
  margin-bottom: 26px;
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}

.catalog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  overflow: hidden;
  display: flex;
  flex-direction: row;
}

.catalog-thumbnail-link {
  display: block;
  flex: 0 0 196px;
  background: var(--surface-soft);
  border-right: 1px solid var(--border);
}

.catalog-thumbnail {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.catalog-body {
  min-width: 0;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.catalog-title {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.01em;
}

.catalog-title a:hover {
  color: var(--primary);
}

.catalog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 0;
}

.catalog-footer-row {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  justify-content: space-between;
}

.catalog-footer-row .catalog-meta {
  margin-bottom: 0;
}

.catalog-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.catalog-link {
  margin-top: 0;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  padding: 8px 14px;
  background: #e0f2fe;
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
}

.catalog-link:hover {
  background: #bae6fd;
}

.transcript-page-link {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: fit-content;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 8px 14px;
  background: white;
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
}

.transcript-page-link:hover {
  border-color: var(--primary);
}

.transcript-page {
  max-width: 1080px;
}

.transcript-header-panel {
  margin-bottom: 14px;
}

.transcript-header-panel h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.transcript-meta-row {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.transcript-actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.transcript-document {
  margin-top: 12px;
  padding: 12px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.transcript-block {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid #eef3f7;
}

.transcript-block:last-child {
  border-bottom: 0;
}

.transcript-time {
  padding-top: 2px;
  color: var(--primary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  white-space: nowrap;
}

.transcript-time:hover {
  text-decoration: underline;
}

.transcript-block-text {
  min-width: 0;
  margin: 0;
  color: #243241;
  font-size: 16px;
  line-height: 1.65;
}

@media (max-width: 760px) {
  .catalog-card {
    flex-direction: column;
  }

  .catalog-thumbnail-link {
    flex-basis: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .transcript-block {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

.video-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.video-title-row .video-title {
  margin: 0;
  min-width: 0;
}

.transcript-source-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.source-original {
  background: #e8f5e9;
  color: #1b5e20;
}

.source-ai {
  background: #fff3e0;
  color: #e65100;
}

.catalog-title-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  flex-wrap: wrap;
}

.catalog-title-row .catalog-title {
  margin: 0;
  min-width: 0;
}