:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --border: #e2e2ea;
  --text: #111827;
  --muted: #6b7280;
  --accent: #111827;
  --accent-soft: #e5e7eb;
  --badge-bg: #f1f5f9;
  --badge-text: #0f172a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: padding 0.15s ease, box-shadow 0.15s ease;
  padding: 16px 0;
}
.site-header.scrolled {
  padding: 8px 0;
  box-shadow: 0 10px 30px rgba(15,23,42,0.08);
}
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo {
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 1.1rem;
}
.logo span { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}
.nav-links a {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--muted);
}
.nav-links a.active {
  background: var(--accent);
  color: #fff;
}
.nav-links a:hover:not(.active) {
  background: var(--accent-soft);
  color: var(--text);
}

main {
  padding: 20px 0 32px;
}

.breadcrumbs {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.breadcrumbs a { color: var(--muted); }

.page-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}
.page-title h1 {
  font-size: 1.3rem;
  margin: 0;
}
.page-title span {
  font-size: 0.8rem;
  color: var(--muted);
}
.page-intro {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 14px;
}

.filters-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 14px 0 12px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
}
.filters-left {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.filters-right {
  display: flex;
  gap: 8px;
  align-items: center;
}
.chip {
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.8rem;
  background: #ffffff;
  color: var(--badge-text);
  cursor: pointer;
  border: 1px solid var(--border);
  white-space: nowrap;
}
.chip.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}
.select {
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  background: #ffffff;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 12px;
}
.video-card {
  border-radius: 14px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(15,23,42,0.10);
  border-color: #d1d5db;
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #020617;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(0,0,0,0.75);
  color: #ffffff;
}
.video-body {
  padding: 9px 11px 11px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.video-title {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.3;
}
.video-title a {
  color: #1d4ed8;
  text-decoration: none;
}
.video-title a:hover {
  text-decoration: underline;
}
.video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--muted);
  gap: 6px;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.72rem;
}
.video-desc {
  font-size: 0.78rem;
  color: var(--muted);
}

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 20px 0 24px;
  font-size: 0.84rem;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 10px;
}
.pagination-links {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}
.pagination-links a {
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.8rem;
}
.pagination-links a.current {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}
.pagination-links a:hover:not(.current) {
  border-color: var(--border);
  background: var(--bg-alt);
}

.page-content {
  max-width: 720px;
  font-size: 0.94rem;
  color: var(--text);
}
.page-content h2 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 20px 0 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  font-size: 0.85rem;
}
.footer-title {
  font-weight: 600;
  font-size: 0.82rem;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.footer-links a {
  display: block;
  padding: 2px 0;
  color: var(--text);
}
.footer-links a span {
  color: var(--muted);
  font-size: 0.78rem;
  margin-left: 4px;
}
.footer-bottom {
  margin-top: 14px;
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.footer-bottom a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.video-layout {
  display: grid;
  grid-template-columns: 2.2fr 1.4fr;
  gap: 24px;
  margin-top: 16px;
}
.video-embed {
  aspect-ratio: 16 / 9;
  background: #020617;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.video-embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
}
.video-info h1 {
  font-size: 1.3rem;
  margin: 0 0 6px;
}
.video-meta-main {
  font-size: 0.82rem;
  color: var(--muted);
}
.video-copy p {
  font-size: 0.9rem;
  color: var(--text);
}
.video-sidebar h2 {
  font-size: 0.95rem;
  margin: 0 0 8px;
}
.sidebar-list a {
  display: block;
  padding: 4px 0;
  font-size: 0.85rem;
  color: #1d4ed8;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0 14px;
}
.pill {
  font-size: 0.75rem;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
}

@media (max-width: 960px) {
  .video-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .video-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 520px) {
  .video-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}