:root {
  --fg: #e6edf3;
  --muted: #9198a1;
  --bg: #0d1117;
  --bg-elev: #161b22;
  --accent: #58a6ff;
  --border: #30363d;
  --tag-bg: #1f2630;
  --radius: 10px;
  --maxw: 64rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --fg: #1f2328;
    --muted: #57606a;
    --bg: #ffffff;
    --bg-elev: #f6f8fa;
    --accent: #0969da;
    --border: #d0d7de;
    --tag-bg: #eaeef2;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
}
.site-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: 0 0 0.25rem;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.site-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  max-width: 48rem;
}

/* Sections */
.section {
  padding: 2rem 0 0.5rem;
  scroll-margin-top: 1rem;
}
.section-head { margin-bottom: 1.25rem; }
.section-title {
  font-size: clamp(1.15rem, 2.5vw, 1.5rem);
  margin: 0 0 0.35rem;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.section-desc {
  margin: 0 0 0.4rem;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 48rem;
}
.section-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.section-link:hover { text-decoration: underline; }

/* Cards grid */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem 1.15rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent); }
.card:focus-within { border-color: var(--accent); }

.card-name {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.card-desc {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.92rem;
  flex: 1 1 auto;
}

/* Tags */
.tags {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.tags li {
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--muted);
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.12rem 0.55rem;
  white-space: nowrap;
}

/* Card link */
.card-link {
  align-self: flex-start;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.card-link:hover { text-decoration: underline; }

/* Footer */
.site-footer {
  margin-top: 2.5rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--border);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.5rem;
}
.footer-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.footer-links a:hover { text-decoration: underline; }
.footer-meta {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-meta a { color: var(--muted); text-decoration: underline; }

/* Focus visibility */
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Responsive tightening on small screens */
@media (max-width: 30rem) {
  .cards {
    grid-template-columns: 1fr;
  }
  .site-header { padding: 1.75rem 0 1rem; }
  .section { padding: 1.5rem 0 0.25rem; }
}