:root {
  color-scheme: light dark;
  --brand: #d9060a;
  --brand-ink: #ffffff;
  --fg: #1b1b1d;
  --muted: #5f6062;
  --bg: #ffffff;
  --soft: #f6f6f7;
  --line: #dddde0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #e5383b;
    --fg: #e9e9ec;
    --muted: #a9aaae;
    --bg: #121214;
    --soft: #1c1c1f;
    --line: #3a3a3e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}
a { color: var(--brand); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* Header */
.top { border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; font-weight: 600; font-size: 1.05rem; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.top nav { display: flex; gap: 4px 16px; flex-wrap: wrap; font-size: .92rem; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--brand); }

/* Hero */
.hero { padding: 64px 0 48px; text-align: center; }
.hero img.mark { width: 88px; height: 88px; border-radius: 20px; }
.hero h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.25; margin: 20px 0 8px; }
.hero p.lead { color: var(--muted); font-size: 1.08rem; margin: 0 auto 32px; max-width: 34em; }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 28px; border-radius: 12px;
  font-size: 1rem; font-weight: 600; text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-disabled { background: var(--soft); color: var(--muted); border-color: var(--line); cursor: not-allowed; }
.btn svg { width: 20px; height: 20px; fill: currentColor; }
.meta { color: var(--muted); font-size: .88rem; margin-top: 14px; }
.meta code { font-size: .8rem; overflow-wrap: anywhere; }

/* Sections */
section.block { padding: 40px 0; border-top: 1px solid var(--line); }
section.block h2 { font-size: 1.35rem; margin: 0 0 20px; text-align: center; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.card { background: var(--soft); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
ol.steps { max-width: 40em; margin: 0 auto; padding-left: 1.4em; }
ol.steps li { margin: 6px 0; }
table.versions { width: 100%; border-collapse: collapse; font-size: .93rem; }
table.versions th, table.versions td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; vertical-align: top; }
table.versions td.hash { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .78rem; color: var(--muted); overflow-wrap: anywhere; }
.table-scroll { overflow-x: auto; }

/* Prose pages */
main.prose { max-width: 760px; margin: 0 auto; padding: 32px 16px 48px; }
main.prose h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 16px; }
main.prose h2 { font-size: 1.15rem; margin: 28px 0 8px; }
main.prose p, main.prose li { overflow-wrap: anywhere; }
.lead-muted { color: var(--muted); margin: -8px 0 20px; }
.note { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; color: var(--muted); font-size: .92rem; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: .88rem; }
footer .links { display: flex; gap: 6px 18px; flex-wrap: wrap; margin-bottom: 10px; }
footer a { color: var(--muted); }
footer .beian { margin-top: 6px; }