:root {
  --bg: #0d1117;
  --bg-secondary: #161b22;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --link: #58a6ff;
  --border: #30363d;
  --accent: #1f6feb;
  --green: #3fb950;
  --max-width: 960px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navigation */
.nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* Main content */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

h1 { font-size: 2.2rem; margin-bottom: 1rem; color: var(--text); }
h2 { font-size: 1.6rem; margin: 2rem 0 1rem; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
h3 { font-size: 1.2rem; margin: 1.5rem 0 0.5rem; }

p { margin-bottom: 1rem; }

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}
.card h3 { margin-top: 0; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--bg-secondary); font-weight: 600; }

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 1.5rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: 2.8rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; color: var(--text-muted); max-width: 700px; margin: 0 auto 2rem; }
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  font-weight: 600;
  margin: 0.25rem;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

/* Breadcrumbs */
.breadcrumb {
  padding: 0.75rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 4rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
}
.footer-col h4 { margin-bottom: 0.75rem; font-size: 0.9rem; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { color: var(--text-muted); font-size: 0.85rem; }
.footer-bottom {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding: 1rem 1.5rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}
.badge-green { background: #1a4731; color: var(--green); }
.badge-blue { background: #0c2d6b; color: var(--link); }
.badge-yellow { background: #3d2e00; color: #d29922; }

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .nav-links { gap: 1rem; }
  .footer-inner { flex-direction: column; }
}