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

:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,.1);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);
  --transition: 200ms ease;
  --transition-slow: 350ms ease;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #ffffff;
  --bg-snippet-hover: #f1f5f9;
  --bg-highlight: #fef08a;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-focus: #667eea;
  --hero-bg: #f1f5f9;
  --header-bg: rgba(255,255,255,.72);
  --toolbar-bg: #ffffff;
}

[data-theme="dark"] {
  --bg: #0b1121;
  --bg-card: #111827;
  --bg-card-hover: #1e293b;
  --bg-input: #111827;
  --bg-snippet-hover: #1e293b;
  --bg-highlight: #854d0e;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #1e293b;
  --border-focus: #818cf8;
  --hero-bg: #0b1121;
  --header-bg: rgba(11,17,33,.78);
  --toolbar-bg: #111827;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
}

/* ─── Header ─────────────────────────────────── */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow), border var(--transition-slow);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -.3px;
}

.logo-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.theme-toggle:hover { border-color: var(--border-focus); box-shadow: var(--shadow-sm); }

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* ─── Hero ───────────────────────────────────── */

.hero {
  position: relative;
  overflow: hidden;
  padding: 80px 24px 100px;
  text-align: center;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
  margin-bottom: 16px;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 36px;
}

.search-form { width: 100%; }

.input-group {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 6px;
  transition: border var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-md);
}

.input-group:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, .15), var(--shadow-lg);
}

.input-icon {
  flex-shrink: 0;
  margin-left: 14px;
  color: var(--text-muted);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
  padding: 14px 12px;
  font-family: var(--font);
}

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

.input-hint {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: 8px;
  min-height: 1.2em;
}

/* ─── Buttons ────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  position: relative;
}

.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--gradient);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius);
  box-shadow: 0 4px 15px rgba(102, 126, 234, .35);
}

.btn-primary:hover { box-shadow: 0 6px 24px rgba(102, 126, 234, .5); transform: translateY(-1px); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
}

.btn-secondary:hover { border-color: var(--border-focus); background: var(--bg-card-hover); }

.btn-sm { padding: 8px 14px; font-size: .82rem; border-radius: var(--radius-sm); }

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
}

.btn.is-loading .btn-text { visibility: hidden; }
.btn.is-loading .btn-spinner {
  display: block;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
}

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

/* ─── Hero Background ────────────────────────── */

.hero-bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; }

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: .35;
  animation: orbFloat 20s ease-in-out infinite;
}

.orb-1 {
  width: 500px; height: 500px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  top: -200px; right: -150px;
}

.orb-2 {
  width: 350px; height: 350px;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  bottom: -150px; left: -100px;
  animation-delay: -7s;
}

.orb-3 {
  width: 250px; height: 250px;
  background: linear-gradient(135deg, #4facfe, #00f2fe);
  top: 40%; left: 50%;
  animation-delay: -14s;
  opacity: .2;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(.95); }
}

/* ─── Results ────────────────────────────────── */

.results {
  padding: 0 24px 80px;
  display: none;
}

.results.visible { display: block; }

.results-container {
  max-width: 900px;
  margin: 0 auto;
}

.results-container.hide-hero + .hero { display: none; }

/* ─── Error Card ─────────────────────────────── */

.error-card {
  text-align: center;
  padding: 60px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.error-card svg { color: #ef4444; margin-bottom: 16px; }
.error-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
.error-card p { color: var(--text-secondary); margin-bottom: 24px; }

/* ─── Loading ────────────────────────────────── */

.results-loading {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border);
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin: 0 auto 16px;
}

/* ─── Video Card ─────────────────────────────── */

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 16px;
  display: flex;
  box-shadow: var(--shadow-sm);
}

.video-thumb {
  position: relative;
  width: 200px;
  min-height: 112px;
  flex-shrink: 0;
  background: #0f172a;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.35);
  opacity: 0;
  transition: opacity var(--transition);
}

.video-thumb:hover .video-play-overlay { opacity: 1; }

.video-info {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}

.video-title {
  font-size: 1rem;
  font-weight: 700;
}

.video-meta { display: flex; gap: 8px; flex-wrap: wrap; }

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
  background: #ede9fe;
  color: #6d28d9;
}

[data-theme="dark"] .meta-badge { background: #312e81; color: #c7d2fe; }

.meta-badge-gen { background: #fef3c7; color: #92400e; }
[data-theme="dark"] .meta-badge-gen { background: #451a03; color: #fde68a; }

/* ─── Toolbar ────────────────────────────────── */

.toolbar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 72px;
  z-index: 50;
}

.toolbar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.toolbar-search {
  flex: 1;
  min-width: 180px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  transition: border var(--transition);
}

.toolbar-search:focus-within { border-color: var(--border-focus); }

.toolbar-search svg { color: var(--text-muted); flex-shrink: 0; }

.toolbar-search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: .85rem;
  font-family: var(--font);
  min-width: 0;
}

.search-count {
  font-size: .75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.search-clear {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 50%;
  transition: all var(--transition);
}

.search-clear:hover { background: var(--bg-card-hover); color: var(--text); }

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.select-sm {
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: .82rem;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
  transition: border var(--transition);
}

.select-sm:focus { border-color: var(--border-focus); }

/* ─── Dropdown ───────────────────────────────── */

.dropdown { position: relative; }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 160px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 60;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all var(--transition);
}

.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 10px 16px;
  border: none;
  background: none;
  color: var(--text);
  font-size: .85rem;
  font-family: var(--font);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
}

.dropdown-item:first-child { border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
.dropdown-item:last-child { border-radius: 0 0 var(--radius-sm) var(--radius-sm); }
.dropdown-item:hover { background: var(--bg-card-hover); }

.dropdown-chevron { transition: transform var(--transition); }
.dropdown.open .dropdown-chevron { transform: rotate(180deg); }

/* ─── Transcript Viewer ──────────────────────── */

.transcript-viewer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.transcript-empty {
  padding: 60px 24px;
  text-align: center;
  color: var(--text-muted);
}

.snippet {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
  scroll-margin-top: 140px;
}

.snippet:hover { background: var(--bg-snippet-hover); }
.snippet:last-child { border-bottom: none; }

.snippet-time {
  flex-shrink: 0;
  font-size: .78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: #667eea;
  min-width: 58px;
  text-decoration: none;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 4px;
  background: transparent;
  transition: background var(--transition);
}

.snippet-time:hover { background: rgba(102,126,234,.12); }

.snippet-text {
  font-size: .92rem;
  line-height: 1.55;
  color: var(--text);
}

.snippet-text mark {
  background: var(--bg-highlight);
  color: var(--text);
  border-radius: 2px;
  padding: 0 1px;
}

.snippet.dim { opacity: .35; transition: opacity var(--transition); }
.snippet.highlight-match { background: var(--bg-snippet-hover); }

/* ─── Features ───────────────────────────────── */

.features {
  padding: 80px 24px 100px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  transition: background var(--transition-slow);
}

.features-container { max-width: 1000px; margin: 0 auto; }

.section-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 48px;
  letter-spacing: -.5px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  background: var(--gradient);
  color: #fff;
}

.feature-card h3 { font-size: 1rem; margin-bottom: 8px; }
.feature-card p { font-size: .85rem; color: var(--text-secondary); line-height: 1.55; }

/* ─── Section Shared ─────────────────────────── */

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: -32px auto 48px;
  line-height: 1.55;
}

/* ─── How It Works ───────────────────────────── */

.how-it-works {
  padding: 80px 24px 80px;
  background: var(--bg);
  transition: background var(--transition-slow);
}

.how-container { max-width: 1000px; margin: 0 auto; }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.step-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.step-card p {
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ─── Use Cases ──────────────────────────────── */

.use-cases {
  padding: 80px 24px 100px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  transition: background var(--transition-slow);
}

.use-cases-container { max-width: 1000px; margin: 0 auto; }

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.use-case-item {
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  transition: border var(--transition), background var(--transition);
}

.use-case-item:hover { border-color: var(--border-focus); }

.use-case-item h3 {
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.use-case-item p {
  font-size: .85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ─── FAQ Section ────────────────────────────── */

.faq {
  padding: 80px 24px 100px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  transition: background var(--transition-slow);
}

.faq-container { max-width: 800px; margin: 0 auto; }

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border var(--transition);
}

.faq-item[open] { border-color: var(--border-focus); }

.faq-question {
  padding: 20px 24px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
  transition: color var(--transition);
}

.faq-question::-webkit-details-marker { display: none; }
.faq-question::marker { display: none; content: ""; }

.faq-question::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--text-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item[open] .faq-question::after {
  content: "\2212";
  transform: rotate(180deg);
}

.faq-question:hover { color: var(--border-focus); }

.faq-answer {
  padding: 0 24px 20px;
  font-size: .88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-answer p { margin: 0; }

/* ─── Footer Enhanced ────────────────────────── */

.footer { padding: 48px 24px 32px; }

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: .85rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.footer-tagline {
  font-size: .82rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 600px;
  line-height: 1.6;
}

.footer-copy {
  font-size: .78rem;
  color: var(--text-muted);
}

/* ─── Toast ──────────────────────────────────── */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: .85rem;
  font-weight: 500;
  animation: toastIn .3s ease;
  pointer-events: auto;
}

.toast.toast-out { animation: toastOut .25s ease forwards; }

@keyframes toastIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastOut { from { opacity: 1; transform: translateY(0); } to { opacity: 0; transform: translateY(12px); } }

/* ─── Responsive ─────────────────────────────── */

@media (max-width: 768px) {
  .hero { padding: 48px 16px 64px; }
  .hero-title { font-size: 1.8rem; }
  .input-group { flex-direction: column; }
  .search-input { width: 100%; }
  .btn-primary { width: 100%; justify-content: center; }
  .video-card { flex-direction: column; }
  .video-thumb { width: 100%; height: 180px; }
  .toolbar-row { flex-direction: column; align-items: stretch; }
  .toolbar-actions { flex-wrap: wrap; }
  .video-info { padding: 12px 16px; }
  .features { padding: 48px 16px 64px; }
  .features-grid { grid-template-columns: 1fr; }
  .how-it-works { padding: 48px 16px 64px; }
  .use-cases { padding: 48px 16px 64px; }
  .faq { padding: 48px 16px 64px; }
  .steps-grid { grid-template-columns: 1fr; }
  .use-cases-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.5rem; margin-bottom: 32px; }
  .section-subtitle { font-size: .95rem; margin: -20px auto 36px; }
  .footer { padding: 36px 16px 24px; }
  .footer-links { gap: 16px; }
}

@media (max-width: 480px) {
  .hero { padding: 32px 12px 48px; }
  .hero-title { font-size: 1.5rem; }
  .hero-subtitle { font-size: .95rem; }
  .snippet { flex-direction: column; gap: 2px; padding: 10px 14px; }
  .toolbar { padding: 10px 12px; top: 60px; }
  .step-card { padding: 24px 20px; }
  .faq-question { padding: 16px 18px; font-size: .88rem; }
  .faq-answer { padding: 0 18px 16px; }
  .section-title { font-size: 1.35rem; }
}