:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #667085;
  --line: #dfe5ee;
  --brand: #1457d9;
  --accent: #0f9f8f;
  --soft: #f5f8fc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #f7f9fc;
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  letter-spacing: 0;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { width: min(980px, calc(100% - 32px)); margin: 0 auto; padding: 34px 0 64px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.brand { color: var(--brand); font-size: 15px; font-weight: 850; }
.back { color: #475467; font-size: 13px; font-weight: 700; }
.paper { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 18px 54px rgba(15, 23, 42, .08); }
.hero { padding: 34px 42px 28px; border-bottom: 1px solid var(--line); background: var(--soft); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 12px; font-weight: 850; text-transform: uppercase; }
h1 { margin: 0; font-size: 32px; line-height: 1.25; letter-spacing: 0; }
.meta { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.content { padding: 30px 42px 48px; }
.notice { margin: 0 0 26px; padding: 14px 16px; border-left: 3px solid var(--accent); background: #f2fbf9; color: #35524e; font-size: 13px; line-height: 1.75; }
h2 { margin: 32px 0 12px; font-size: 19px; line-height: 1.4; }
h2:first-of-type { margin-top: 0; }
h3 { margin: 22px 0 8px; font-size: 15px; }
p, li { color: #3f4b5f; font-size: 14px; line-height: 1.85; }
p { margin: 8px 0; }
ul, ol { margin: 8px 0; padding-left: 22px; }
li + li { margin-top: 5px; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { width: 100%; min-width: 600px; border-collapse: collapse; font-size: 13px; }
th, td { padding: 12px 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.65; }
th { background: var(--soft); color: #344054; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 26px; padding: 0; list-style: none; }
.toc a { display: inline-flex; min-height: 32px; align-items: center; padding: 0 10px; border: 1px solid var(--line); border-radius: 6px; color: #475467; background: #fff; font-size: 12px; font-weight: 700; }
.footer { padding: 18px 42px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.7; }
@media (max-width: 680px) {
  .shell { width: min(100% - 20px, 980px); padding-top: 18px; }
  .hero, .content { padding-left: 20px; padding-right: 20px; }
  .hero { padding-top: 26px; }
  h1 { font-size: 26px; }
  .footer { padding-left: 20px; padding-right: 20px; }
}