:root {
  --bg: #f5f4f2;
  --text: #1b1917;
  --muted: #6b6560;
  --line: #e5e1db;
  --primary: #c97422;
  --blue: #3d6f9a;
  --soft: #fff6eb;
  --side: 280px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text); background: var(--bg); line-height: 1.65; }
a { color: var(--blue); text-decoration: none; }
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--side);
  background: #fff; border-right: 1px solid var(--line); overflow: auto; padding: 20px 16px 32px;
}
.kicker { color: var(--primary); font-weight: 800; font-size: 0.78rem; letter-spacing: .06em; }
.sidebar h1 { font-size: 1.15rem; margin: 6px 0; }
.sidebar p { color: var(--muted); font-size: 0.88rem; margin: 0 0 12px; }
.sidebar nav a { display: block; padding: 7px 8px; border-radius: 8px; color: var(--text); }
.sidebar nav a:hover, .sidebar nav a.active { background: var(--soft); color: var(--primary); }
.main { margin-left: var(--side); padding: 28px 40px 80px; max-width: 1080px; }
.top { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 18px; }
.menu-btn { display: none; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 6px 10px; }
article { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 28px; margin-bottom: 18px; }
h2 { margin-top: 0; }
h3 { margin-bottom: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { border-bottom: 1px solid var(--line); text-align: left; padding: 8px 6px; vertical-align: top; }
th { color: var(--blue); }
figure { margin: 14px 0; }
img { width: 100%; border: 1px solid var(--line); border-radius: 10px; }
figcaption { color: var(--muted); font-size: 0.85rem; margin-top: 6px; }
blockquote { margin: 0 0 12px; padding: 12px 14px; background: #eef3f8; border-radius: 10px; }
ul { padding-left: 1.2rem; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 20; }
  .sidebar.open { transform: none; }
  .main { margin-left: 0; padding: 16px; }
  .menu-btn { display: inline-block; }
  .grid { grid-template-columns: 1fr; }
}