/* 轻量样式：无外部字体、无 JS，利于 Core Web Vitals 与移动端加载 */
:root {
  --fg: #1c1f23;
  --muted: #5d6673;
  --bg: #ffffff;
  --line: #e6e9ee;
  --accent: #1f6feb;
  --card: #fbfcfe;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 8px 18px 48px; }

.site-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; max-width: 760px; margin: 0 auto; padding: 14px 18px;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; text-decoration: none; color: var(--fg); }
.langs a { margin-left: 10px; font-size: 14px; color: var(--muted); text-decoration: none; }
.langs a.on { color: var(--accent); font-weight: 600; }

h1 { font-size: 28px; line-height: 1.3; margin: 22px 0 10px; }
h2 { font-size: 21px; margin: 30px 0 10px; }
h3 { font-size: 17px; margin: 22px 0 8px; }

a { color: var(--accent); }
p, li { overflow-wrap: break-word; }

.meta, .muted { color: var(--muted); font-size: 14px; }
.lead { font-size: 18px; color: var(--muted); }

.crumbs { font-size: 13px; color: var(--muted); margin-top: 14px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs span { margin: 0 6px; }

figure { margin: 18px 0; }
figure img { width: 100%; height: auto; border-radius: 8px; display: block; }
.img-side { float: right; width: 42%; margin: 6px 0 14px 18px; }
@media (max-width: 620px) { .img-side { float: none; width: 100%; margin: 14px 0; } }

.content table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 15px; }
.content th, .content td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.content th { background: var(--card); }
.content blockquote {
  margin: 18px 0; padding: 10px 14px; border-left: 3px solid var(--line);
  color: var(--muted); background: var(--card);
}
.content ul { padding-left: 20px; }

.cta { margin: 26px 0; }
.cta a {
  display: inline-block; padding: 11px 18px; border-radius: 8px;
  background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
}

.cards { list-style: none; padding: 0; display: grid; gap: 14px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; background: var(--card); }
.card h2, .card h3 { margin: 0 0 6px; font-size: 17px; }
.card a { text-decoration: none; }
.card p { margin: 4px 0 0; font-size: 14px; }

.related { margin-top: 36px; border-top: 1px solid var(--line); padding-top: 14px; }
.related ul { padding-left: 20px; }

.site-footer {
  max-width: 760px; margin: 0 auto; padding: 20px 18px 40px;
  border-top: 1px solid var(--line); color: var(--muted); font-size: 13px;
}

.pagination { display: flex; gap: 10px; list-style: none; padding: 18px 0 0; }