:root {
  --bg: #fbfaf6;
  --fg: #1f2328;
  --muted: #57606a;
  --accent: #2858a6;
  --card-bg: #ffffff;
  --card-border: #d0d7de;
  --card-hover: #2858a6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #8b949e;
    --accent: #4493f8;
    --card-bg: #161b22;
    --card-border: #30363d;
    --card-hover: #4493f8;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 4rem 1.5rem 2rem;
}

header {
  margin-bottom: 3rem;
  text-align: center;
}

header h1 {
  font-size: 2.75rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.5rem 1.5rem 1.25rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--card-hover);
  transform: translateY(-2px);
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  color: var(--accent);
}

.card .lead {
  margin: 0 0 0.5rem;
  font-weight: 500;
}

.card .meta {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.card .cta {
  display: inline-block;
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--card-border);
  padding-top: 1.5rem;
}

footer a {
  color: var(--muted);
  text-decoration: underline;
}

footer a:hover {
  color: var(--accent);
}

footer .build-info {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;
}

footer .build-info code {
  font-family: inherit;
  background: var(--card-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--card-border);
}