:root {
  --bg: #f8fafc;
  --card: #fff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0ea5e9;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem 1.5rem;
}

article h2 {
  font-size: 1.1rem;
  margin: 1.75rem 0 0.75rem;
}

article h2:first-child {
  margin-top: 0;
}

article p,
article li {
  font-size: 0.95rem;
  color: #334155;
}

article ul {
  padding-left: 1.25rem;
}

footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.85rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}