:root {
  --bg: #f7f7f8;
  --bg-card: #ffffff;
  --bg-muted: #eceef1;
  --text: #1c1d21;
  --text-muted: #6b6f76;
  --accent: #4f46e5;
  --accent-contrast: #ffffff;
  --border: #e3e4e8;
  --shadow: 0 1px 2px rgba(20, 20, 30, 0.06), 0 4px 12px rgba(20, 20, 30, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --bg-card: #1e1f23;
    --bg-muted: #26272c;
    --text: #ecedee;
    --text-muted: #9a9ea6;
    --accent: #8385ff;
    --accent-contrast: #101014;
    --border: #2c2d33;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.site-header {
  padding: 2.5rem 1.5rem 1rem;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.tag-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  padding: 0 1.5rem 1.5rem;
}

.tag-filter {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

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

.tag-filter.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  padding: 0 1.5rem 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(20, 20, 30, 0.08), 0 12px 24px rgba(20, 20, 30, 0.08);
}

.card-thumb {
  position: relative;
  height: 160px;
  overflow: hidden;
  background: var(--bg-muted);
  border-bottom: 1px solid var(--border);
}

.card-thumb iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 400%;
  height: 400%;
  border: 0;
  transform: scale(0.25);
  transform-origin: 0 0;
  pointer-events: none;
  background: #fff;
}

.card-body {
  padding: 0.9rem 1rem 1rem;
}

.card-body h2 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--bg-muted);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
}

.card-desc {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-meta {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .site-header {
    padding: 1.75rem 1rem 0.75rem;
  }
  .grid {
    grid-template-columns: 1fr;
    padding: 0 1rem 2rem;
  }
}