:root{--bg:#f6f7f8;--card:#fff;--text:#14181f;--muted:#5d6673;--line:#e3e6ea;--brand:#0f766e;--brand-ink:#fff;--up:#c2410c;--down:#047857;--soft:#ecf6f5;--warn:#fff7e6;--warn-line:#f2d39b}
@media (prefers-color-scheme:dark){:root{--bg:#0e1114;--card:#161b20;--text:#e7eaee;--muted:#9aa3ae;--line:#272e36;--brand:#2dd4bf;--brand-ink:#04211e;--up:#fb923c;--down:#34d399;--soft:#13272a;--warn:#2a2213;--warn-line:#5c4a22}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.top{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;gap:6px 20px;flex-wrap:wrap;min-height:56px;padding-top:8px;padding-bottom:8px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:18px;color:var(--text)}
.brand:hover{text-decoration:none}
.mark{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--brand);color:var(--brand-ink);font-size:16px}
nav{display:flex;flex-wrap:wrap;gap:2px 16px;flex:1}
nav a{color:var(--muted);font-size:15px}
nav a[aria-current]{color:var(--text);font-weight:600}
.lang{border:1px solid var(--line);border-radius:6px;padding:2px 10px;font-size:14px;color:var(--text)}
h1{font-size:28px;line-height:1.3;margin:28px 0 10px}
h2{font-size:20px;margin:36px 0 12px}
.lead{color:var(--muted);font-size:17px;margin:0 0 16px}
.lead b,.answer b{color:var(--text)}
.answer{font-size:20px;margin:8px 0}
.notice{background:var(--warn);border:1px solid var(--warn-line);border-radius:8px;padding:10px 14px;margin:16px 0 0}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0 8px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.card span{display:block;color:var(--muted);font-size:14px}
.card b{display:block;font-size:26px;line-height:1.3;font-variant-numeric:tabular-nums}
.card small{color:var(--muted);font-size:12px}
.card.hero{border-color:var(--brand);background:var(--soft)}
.up{color:var(--up)}.down{color:var(--down)}
.stamp{color:var(--muted);font-size:13px;margin:4px 0 0}
.table-wrap{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;white-space:nowrap;font-variant-numeric:tabular-nums}
th,td{padding:10px 14px;text-align:right;border-bottom:1px solid var(--line)}
th:first-child{text-align:left}
thead th{font-size:13px;color:var(--muted);font-weight:500}
tbody tr:last-child>*{border-bottom:0}
tbody th{font-weight:600}
tbody th small{color:var(--muted);font-weight:400}
.hint{color:var(--muted);font-size:13px;margin:8px 0 0}
.chart{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-bottom:8px}
.seg button{border:0;background:none;color:var(--muted);padding:4px 12px;font:inherit;font-size:14px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--brand);color:var(--brand-ink)}
.plot{min-height:220px;position:relative}
.plot svg{display:block;width:100%;height:240px}
.plot .empty{color:var(--muted);font-size:14px;padding:80px 0;text-align:center}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin-top:4px}
.legend i{display:inline-block;width:14px;height:3px;border-radius:2px;vertical-align:middle;margin-right:6px}
.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0}
.chips li{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:3px 12px;font-size:14px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 16px;margin-bottom:8px}
.faq summary{cursor:pointer;font-weight:600}
.faq p{margin:8px 0 0;color:var(--muted)}
.links{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px;list-style:none;padding:0;margin:0}
.links a{display:flex;justify-content:space-between;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 14px;color:var(--text)}
.links span{color:var(--muted);font-variant-numeric:tabular-nums}
.calc{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;margin:16px 0}
.calc.wide{grid-template-columns:repeat(4,1fr)}
.calc label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:var(--muted)}
.calc input,.calc select{font:inherit;font-size:16px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--text);min-width:0}
.calc .out{grid-column:1/-1;font-size:22px;font-weight:700;font-variant-numeric:tabular-nums}
.cta{background:var(--card);border:1px solid var(--brand);border-radius:12px;padding:16px;margin:24px 0}
.cta p{margin:0 0 12px}
.btn{display:inline-block;background:var(--brand);color:var(--brand-ink);border-radius:8px;padding:8px 18px;font-weight:600;margin:0 8px 4px 0}
.btn:hover{text-decoration:none;opacity:.9}
.more{font-weight:600}
.foot{color:var(--muted);font-size:13px;padding-top:32px;padding-bottom:40px;border-top:1px solid var(--line);margin-top:48px}
@media (max-width:720px){
  h1{font-size:23px}
  .cards{grid-template-columns:repeat(2,1fr)}
  .card b{font-size:21px}
  .calc,.calc.wide{grid-template-columns:1fr}
  nav{order:3;flex-basis:100%;gap:2px 14px}
  .bar{gap:4px 12px}
  th,td{padding:8px 10px}
}
.dim{opacity:.55}
sup{color:var(--muted)}