:root {
  --bg: #0d1117;
  --card: #161b22;
  --border: #30363d;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

header {
  border-bottom: 1px solid var(--border);
  background: rgba(13,17,23,0.9);
  position: sticky; top: 0; z-index: 10;
}
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { color: var(--fg); text-decoration: none; font-weight: 700; font-size: 1.2rem; }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
nav a:hover { color: var(--fg); }

.hero { padding: 60px 0 40px; }
.hero h1 { font-size: 2rem; margin: 0 0 16px; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 760px; }
.disclosure { font-size: 0.85rem; color: var(--muted); border-left: 3px solid var(--accent); padding-left: 12px; margin-top: 24px; }
.cta {
  display: inline-block; margin-top: 22px; background: var(--accent); color: #0d1117;
  text-decoration: none; font-weight: 600; padding: 12px 20px; border-radius: 8px;
}
.cta:hover { filter: brightness(1.1); }

.grid { padding: 20px 0 40px; }
.grid h2 { font-size: 1.4rem; margin: 0 0 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 18px; text-decoration: none; color: var(--fg);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 8px; font-size: 1.05rem; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

footer { border-top: 1px solid var(--border); padding: 24px 0; margin-top: 20px; }
footer p { color: var(--muted); font-size: 0.9rem; }
footer a { color: var(--muted); }

.content { max-width: 760px; padding: 40px 20px 60px; }
.content h1 { font-size: 1.6rem; }
.content h2 { font-size: 1.2rem; margin-top: 28px; }
.content a { color: var(--accent); }

@media (max-width: 640px) {
  nav a { margin-left: 12px; font-size: 0.85rem; }
  .hero h1 { font-size: 1.5rem; }
}