:root {
  --bg: #f7f8fc;
  --panel: #ffffff;
  --ink: #20242f;
  --ink-2: #5c6270;
  --line: #e5e7f0;
  --accent: #4f46e5;
  --accent-2: #06b6d4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141a;
    --panel: #1b1e26;
    --ink: #e8eaf2;
    --ink-2: #9aa0b4;
    --line: #2a2e3c;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.85;
}
.topbar {
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0;
}
.brand { font-weight: 800; font-size: 18px; color: var(--ink); text-decoration: none; }
.brand .sub { font-size: 12px; font-weight: 500; color: var(--ink-2); margin-left: 6px; }
.article { max-width: 760px; margin: 0 auto; padding: 28px 20px 40px; }
.breadcrumb { font-size: 13px; color: var(--ink-2); margin-bottom: 6px; }
.breadcrumb a { color: var(--ink-2); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
h1 { font-size: 27px; line-height: 1.4; margin: 8px 0 4px; }
.page-desc { color: var(--ink-2); font-size: 15px; margin-top: 0; }
h2 { font-size: 20px; margin-top: 34px; border-left: 4px solid var(--accent); padding-left: 10px; }
h3 { font-size: 16px; margin-top: 22px; }
a { color: var(--accent); }
table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
th { background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
code { background: color-mix(in srgb, var(--accent) 8%, transparent); border-radius: 4px; padding: 1px 5px; font-size: 0.9em; }
ul, ol { padding-left: 24px; }
.cta {
  margin: 30px 0; padding: 18px 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, var(--panel)), color-mix(in srgb, var(--accent-2) 10%, var(--panel)));
  border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.cta b { font-size: 16px; }
.cta .btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; text-decoration: none; font-weight: 600;
  padding: 10px 20px; border-radius: 10px; white-space: nowrap;
}
.faq { margin-top: 30px; }
.faq h2 { border-left-color: var(--accent-2); }
.related { margin-top: 34px; border-top: 1px solid var(--line); padding-top: 16px; }
.related ul { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px 16px; }
.related a { text-decoration: none; font-size: 14px; }
.all-guides { margin-top: 40px; border-top: 1px solid var(--line); padding-top: 16px; }
.all-guides .groups { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.all-guides .groups a { font-size: 13px; color: var(--ink-2); text-decoration: none; }
.all-guides .groups a:hover { color: var(--accent); }
.footer { max-width: 760px; margin: 0 auto; padding: 0 20px 40px; color: var(--ink-2); font-size: 13px; }