:root {
  --bg: #0d1117;
  --bg-alt: #161b22;
  --fg: #c9d1d9;
  --muted: #8b949e;
  --accent: #58a6ff;
  --border: #30363d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
header {
  border-bottom: 1px solid var(--border);
  padding: 1.2rem 0;
  background: var(--bg-alt);
}
nav {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav .brand { font-weight: 600; color: var(--fg); text-decoration: none; }
nav .links a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}
nav .links a:hover { color: var(--accent); }
main { max-width: 780px; margin: 0 auto; padding: 3rem 1.5rem; }
h1 { font-size: 1.9rem; margin-bottom: 0.3rem; }
h2 { font-size: 1.3rem; margin-top: 2.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; }
p.lead { color: var(--muted); font-size: 1.05rem; }
.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0;
}
.card h3 { margin: 0 0 0.4rem 0; font-size: 1.05rem; }
.card .meta { color: var(--muted); font-size: 0.85rem; margin-bottom: 0.5rem; }
.tag {
  display: inline-block;
  background: #1f6feb22;
  color: var(--accent);
  border: 1px solid #1f6feb55;
  border-radius: 4px;
  padding: 0.1rem 0.5rem;
  font-size: 0.78rem;
  margin-right: 0.4rem;
}
code {
  background: #1f242c;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}
footer {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}
a { color: var(--accent); }