:root { color-scheme: dark; --bg: #05080d; --panel: #0b1018; --text: #e8ecf1; --muted: #a1acbd; --gold: #d6b881; --line: #283241; }
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: system-ui, "Microsoft JhengHei", sans-serif; font-size: 16px; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--gold); outline-offset: 4px; }
.skip { position: absolute; left: 20px; top: -90px; background: var(--gold); color: var(--bg); padding: 10px 16px; z-index: 1; }
.skip:focus { top: 10px; }
.site-header, main, footer { width: min(960px, calc(100% - 48px)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 88px; border-bottom: 1px solid var(--line); }
.site-header a { padding-block: 12px; font-size: 14px; }
.brand { font-weight: 650; letter-spacing: .14em; }
.brand span { color: var(--gold); font-size: 11px; margin-left: 10px; }
.hero { padding: 58px 0 38px; max-width: 630px; }
.eyebrow { margin: 0 0 12px; color: var(--gold); font-size: 12px; letter-spacing: .14em; }
h1 { margin: 0; font-size: clamp(34px, 7vw, 52px); line-height: 1.25; font-weight: 550; letter-spacing: .03em; }
.lead { color: var(--muted); margin: 22px 0; }
.start { display: inline-flex; gap: 32px; align-items: center; min-height: 48px; color: var(--gold); border-bottom: 1px solid var(--gold); }
.topics { display: flex; flex-wrap: wrap; gap: 4px 20px; padding: 12px 0; border-block: 1px solid var(--line); }
.topics a { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); font-size: 14px; }
.topics a:hover, .site-header a:hover, footer a:hover { color: var(--gold); }
section { padding-top: 38px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
h2 { margin: 0; font-size: 20px; font-weight: 550; }
.section-head>span { white-space: nowrap; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.page-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); list-style: none; padding: 0; margin: 0; gap: 1px 24px; }
.page-list li { min-width: 0; border-bottom: 1px solid var(--line); }
.page-list a { display: flex; align-items: baseline; gap: 18px; min-height: 62px; padding: 16px 10px 16px 0; }
.page-list a::after { content: '↗'; color: var(--muted); margin-left: auto; padding-left: 6px; }
.page-list a:hover { background: var(--panel); color: var(--gold); }
.page-list a:visited { color: #bea6cf; }
.number { flex: 0 0 24px; color: var(--gold); font-size: 13px; font-variant-numeric: tabular-nums; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 54px; padding: 24px 0 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
footer a { display: inline-block; min-height: 44px; padding-block: 10px; }
@media (max-width: 600px) {
  .site-header, main, footer { width: calc(100% - 40px); }
  .site-header { min-height: 76px; gap: 10px; }
  .site-header a { font-size: 12px; }
  .brand span { margin-left: 5px; font-size: 10px; }
  .hero { padding-top: 40px; }
  .page-list { grid-template-columns: minmax(0, 1fr); }
  .section-head { gap: 10px; }
  h2 { font-size: 18px; }
  .page-list a { gap: 14px; }
}