:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --accent: #e879b8;
  --warn: #f0b429;
  --border: #2a2e37;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 1.1rem; }
.nav nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-size: 0.95rem;
}
.nav nav a.on, .nav nav a:hover { color: var(--accent); }
main { max-width: 720px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }
.hero h1 { font-size: 1.75rem; margin: 0 0 0.75rem; }
.hero .meta { color: var(--muted); font-size: 0.9rem; }
.cards { display: grid; gap: 1rem; margin: 2rem 0; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
.cards article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
}
.cards h2 { margin: 0 0 0.75rem; font-size: 1.05rem; color: var(--accent); }
.cards ul { margin: 0; padding-left: 1.1rem; color: var(--muted); }
.note, .fine { color: var(--muted); font-size: 0.9rem; }
.warn {
  color: var(--warn);
  background: rgba(240, 180, 41, 0.08);
  border: 1px solid rgba(240, 180, 41, 0.25);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
}
a { color: var(--accent); }
footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; margin-top: 1.75rem; }
h3 { font-size: 1rem; margin-top: 1.25rem; }
ul { color: var(--muted); }