:root{--paper:#fff;--ink:#101b2a;--accent:#2454e6;--muted:#596578;--rule:#d6dbe2;--soft:#f3f5f8;--body:Arial,Helvetica,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:18px;line-height:1.5}
a{color:inherit}
a:hover{color:var(--accent)}
button{font:inherit;cursor:pointer}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
html[lang=en] [data-l=zh],html[lang=zh-CN] [data-l=en]{display:none}
.wrap{width:min(1120px,calc(100% - 48px));margin-inline:auto}
.site-header{display:flex;align-items:center;gap:28px;padding-block:24px;border-bottom:1px solid var(--rule)}
.wordmark{font-weight:750;letter-spacing:-.04em;margin-right:auto;text-decoration:none}
nav{display:flex;flex-wrap:wrap;gap:18px;font-size:16px}
nav a{text-decoration:none}
.languages{display:flex;gap:6px;align-items:center}
.languages button{border:0;background:transparent;color:var(--ink);padding:4px 0}
.languages [aria-pressed=true]{color:var(--accent)}
main{padding-block:36px 64px}
h1{font-size:clamp(36px,5vw,56px);line-height:1.12;letter-spacing:-.04em;margin:0 0 16px}
h2{font-size:clamp(26px,3vw,34px);letter-spacing:-.03em;margin:36px 0 12px}
p{margin:0 0 14px}
.lede{font-size:20px;max-width:760px}
.meta{color:var(--muted);font-size:15px}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:20px}
.card{display:block;border:1px solid var(--rule);padding:20px;text-decoration:none;background:var(--soft)}
.card strong{display:block;margin-bottom:8px}
.note{border-top:1px solid var(--rule);padding-top:16px;color:var(--muted);font-size:16px}
.chart-scroll{overflow-x:auto;border:1px solid var(--rule);background:var(--paper);margin:12px 0}
.chart-scroll svg{display:block;min-width:720px}
.legend{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:14px;margin:8px 0 16px}
.swatch{display:inline-block;width:12px;height:12px;border:2px solid var(--accent);margin-right:6px;vertical-align:-1px}
.swatch.solid{background:var(--accent)}
.swatch.hollow{background:transparent}
.swatch.gray{background:var(--soft);border-color:var(--rule)}
.gray-strip,.conflicts{background:var(--soft);padding:12px 14px;margin:8px 0 16px}
.gray-strip h3,.conflicts h3{margin:0 0 8px;font-size:16px}
.gray-strip ul,.conflicts ul{margin:0;padding-left:18px}
table{width:100%;border-collapse:collapse;font-size:14px;margin:8px 0 28px}
th,td{border-top:1px solid var(--rule);text-align:left;vertical-align:top;padding:8px 6px}
th{color:var(--muted);font-weight:600}
.table-scroll{overflow-x:auto}
.anchor{scroll-margin-top:16px}
.subnav{display:flex;flex-wrap:wrap;gap:12px;font-size:15px;margin:8px 0 20px}
.subnav a{text-decoration:none}
footer{border-top:1px solid var(--rule);padding:20px 0 32px;color:var(--muted);font-size:14px}
@media(max-width:700px){
  .wrap{width:calc(100% - 32px)}
  .site-header{flex-wrap:wrap;gap:12px}
  .cards{grid-template-columns:1fr}
  h1{font-size:34px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}