:root {
  /* Colors */
  --primary-color: #0066cc;
  --primary-color-hover: #0052a3;
  --secondary-color: #333333;
  --background-color: #f0f4fb;
  --surface-color: #ffffff;
  --border-color: #e2e8f3;
  --text-primary: #1a1f36;
  --text-secondary: #5b6474;
  --error-color: #dc3545;
  --success-color: #28a745;

  /* Layout */
  --shell-width: min(100% - 32px, 960px);
  --card-radius: 18px;
  --card-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);

  /* Typography */
  --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

body {
  margin: 0;
  font-family: var(--font-primary);
  background: linear-gradient(180deg, rgba(240, 244, 251, 1) 0%, rgba(236, 241, 249, 1) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

button {
  font-family: inherit;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: #fff;
  border-radius: 999px;
  z-index: 1000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  backdrop-filter: blur(12px);
  padding: 24px 0;
}

.site-nav {
  width: var(--shell-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0;
}

.site-links {
  display: flex;
  gap: 1.25rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.site-links a {
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-links a:hover,
.site-links a:focus-visible {
  color: var(--primary-color);
  border-color: rgba(0, 102, 204, 0.35);
}

.app-main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 24px 0 80px;
}

.app-shell {
  width: var(--shell-width);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 28px;
  text-align: center;
  align-items: center;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.hero-subtitle {
  margin: 8px 0 0;
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
}

.search-card {
  width: 100%;
  background: var(--surface-color);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: stretch;
}

.search-field {
  position: relative;
  display: flex;
  align-items: center;
  border: 1px solid transparent;
  border-radius: 999px;
  background: rgba(241, 245, 255, 0.6);
  padding: 6px 6px 6px 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-field:focus-within {
  border-color: rgba(0, 102, 204, 0.4);
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.15);
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1.1rem;
  color: var(--text-primary);
  padding: 10px 0;
}

.search-input::placeholder {
  color: rgba(26, 31, 54, 0.45);
}

.search-input:focus {
  outline: none;
}

.clear-button {
  appearance: none;
  border: none;
  background: #fff;
  color: var(--text-secondary);
  font-size: 1.4rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.clear-button:hover,
.clear-button:focus-visible {
  background: var(--primary-color);
  color: #fff;
  transform: scale(1.05);
}

.search-help {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.search-meta {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}

.filter-selects {
  display: flex;
  gap: 12px;
}

.filter-select {
  min-width: 170px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: rgba(241, 245, 255, 0.55);
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.filter-select:focus-visible {
  outline: none;
  border-color: rgba(0, 102, 204, 0.5);
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.15);
}

.scope-group {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  margin: 0;
  border-radius: 14px;
  border: 1px solid rgba(226, 232, 243, 0.9);
  background: rgba(241, 245, 255, 0.55);
}

.scope-group legend {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-right: 8px;
}

.scope-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 8px;
  border-radius: 12px;
  transition: background 0.2s ease, color 0.2s ease;
}

.scope-option:hover,
.scope-option:focus-within {
  background: rgba(0, 102, 204, 0.08);
  color: var(--primary-color);
}

.scope-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--primary-color);
}

.results-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.results-container {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.loading-state,
.empty-state,
.no-results,
.error-state {
  background: var(--surface-color);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: 48px 32px;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state h2,
.no-results h2,
.error-state h2 {
  margin: 0 0 12px;
  font-size: 1.4rem;
  color: var(--text-primary);
}

.suggested-searches {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.suggestion-pill {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  background: rgba(0, 102, 204, 0.08);
  color: var(--primary-color);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.suggestion-pill:hover,
.suggestion-pill:focus-visible {
  background: rgba(0, 102, 204, 0.18);
  transform: translateY(-1px);
}

.result-card {
  background: var(--surface-color);
  border-radius: 20px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.result-card:hover,
.result-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 24px 45px rgba(15, 23, 42, 0.12);
}

.result-link {
  display: grid;
  gap: 20px;
  padding: 20px 24px;
  grid-template-columns: minmax(140px, 220px) 1fr;
  align-items: center;
  color: inherit;
}

.result-card.no-thumbnail .result-link {
  grid-template-columns: 1fr;
}

.result-thumbnail {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #eef2f8;
}

.result-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-duration {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(17, 25, 40, 0.7);
  color: #fff;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
}

.result-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
}

.result-timestamp {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: var(--text-secondary);
}

.timestamp-badge {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 102, 204, 0.1);
  color: var(--primary-color);
  font-weight: 500;
  font-size: 0.9rem;
}

.timestamp-description {
  margin: 0;
  font-size: 0.95rem;
}

.result-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.result-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.result-tags .tag {
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 102, 204, 0.08);
  color: var(--primary-color);
  font-size: 0.85rem;
  font-weight: 500;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
}

.pagination-button {
  border: none;
  background: var(--surface-color);
  color: var(--primary-color);
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.pagination-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.pagination-button:not(:disabled):hover,
.pagination-button:not(:disabled):focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 32px rgba(15, 23, 42, 0.12);
  background: rgba(0, 102, 204, 0.08);
}

#pageIndicator {
  font-weight: 500;
  color: var(--text-secondary);
}

.site-footer {
  padding: 48px 0 64px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.site-footer .container {
  width: var(--shell-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.site-footer a {
  color: inherit;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--primary-color);
  border-color: rgba(0, 102, 204, 0.4);
}

.spinner {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  border: 4px solid rgba(0, 102, 204, 0.15);
  border-top-color: var(--primary-color);
  animation: spin 1s linear infinite;
}

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

mark {
  background: rgba(0, 102, 204, 0.2);
  color: inherit;
  padding: 0 0.1em;
  border-radius: 4px;
}

@media (max-width: 960px) {
  .site-header {
    padding: 16px 0;
  }

  .site-nav {
    flex-direction: column;
    gap: 12px;
  }

  .site-links {
    gap: 1rem;
  }

  .app-main {
    padding: 16px 0 56px;
  }

  .search-card {
    padding: 22px;
  }

  .result-link {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .filter-row {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-selects {
    width: 100%;
    flex-direction: column;
  }

  .filter-select {
    width: 100%;
  }

  .scope-group {
    flex-wrap: wrap;
    justify-content: center;
  }

  .search-meta {
    flex-direction: column;
    gap: 4px;
  }

  .search-card {
    gap: 16px;
  }

  .results-container {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .app-main {
    padding-bottom: 48px;
  }

  .search-card {
    padding: 18px;
  }

  .site-footer {
    padding: 36px 0 48px;
  }
}