:root{
  --bg:#F7F7F5; --surface:#FFFFFF; --surface-2:#FBFBF9;
  --ink:#181A1B; --muted:#5E6366; --faint:#8A8F92;
  --line:#E3E3DE; --line-strong:#D2D2CB;
  --brand:#173B57; --brand-ink:#0E2739; --accent:#2F7D5A; --warn:#8A5A1E;
  --radius:10px;
  --mono:"Inter",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --maxw:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
h1,h2,h3{margin:0;line-height:1.15;letter-spacing:-0.02em;font-weight:600}
p{margin:0}
a{color:inherit}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* ── nav ── */
header{position:sticky;top:0;z-index:50;background:rgba(247,247,245,.88);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:16px;height:60px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:.02em;font-size:15px}
.logo .mark{width:22px;height:22px;flex:none}
.nav .sp{flex:1}
.langbtn{
  border:1px solid var(--line-strong);background:transparent;color:var(--muted);
  font:inherit;font-size:13px;padding:6px 11px;border-radius:7px;cursor:pointer;
}
.langbtn:hover{color:var(--ink);border-color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--brand);color:#fff;border:1px solid var(--brand);
  font:inherit;font-weight:500;font-size:14px;padding:9px 16px;border-radius:8px;
  text-decoration:none;cursor:pointer;white-space:nowrap;
}
.btn:hover{background:var(--brand-ink);border-color:var(--brand-ink)}
.btn.lg{font-size:16px;padding:13px 24px;border-radius:9px}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn.ghost:hover{background:#fff;border-color:var(--ink)}

/* ── sections ── */
section{padding:84px 0;border-bottom:1px solid var(--line)}
section.hero{padding:64px 0 76px;border-bottom:1px solid var(--line)}
.eyebrow{font-size:12px;letter-spacing:.10em;text-transform:uppercase;color:var(--faint);font-weight:600;margin-bottom:14px}
h1{font-size:clamp(34px,5.2vw,54px)}
h2{font-size:clamp(25px,3.2vw,34px)}
.lede{font-size:clamp(16px,1.6vw,18.5px);color:var(--muted);max-width:56ch;margin-top:18px}
.sub{color:var(--muted);margin-top:12px;max-width:62ch}
.fine{font-size:13px;color:var(--faint);margin-top:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:28px}

.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:48px;align-items:center}
@media(max-width:940px){.hero-grid{grid-template-columns:1fr;gap:36px}}

/* ── demo panel ── */
.panel{
  background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);
  box-shadow:0 1px 2px rgba(24,26,27,.04),0 12px 32px -18px rgba(24,26,27,.28);
  overflow:hidden;
}
.panel-bar{
  display:flex;align-items:center;gap:8px;height:34px;padding:0 12px;
  background:var(--surface-2);border-bottom:1px solid var(--line);
  font-size:11.5px;color:var(--faint);letter-spacing:.04em;text-transform:uppercase;font-weight:600;
}
.dot{width:8px;height:8px;border-radius:50%;background:var(--line-strong)}
.panel-body{padding:16px}
.demo{display:grid;grid-template-columns:172px minmax(0,1fr);gap:14px}
@media(max-width:560px){.demo{grid-template-columns:1fr}}

.field{margin-bottom:9px}
.field label{display:block;font-size:11px;color:var(--faint);text-transform:uppercase;letter-spacing:.06em;font-weight:600;margin-bottom:3px}
.field .val{
  border:1px solid var(--line-strong);border-radius:6px;padding:6px 9px;font-size:14px;
  background:var(--surface-2);min-height:31px;display:flex;align-items:center;
}
.field .val.active{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(23,59,87,.09)}
.caret{display:inline-block;width:1px;height:15px;background:var(--brand);margin-left:1px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

.genbtn{
  width:100%;margin-top:4px;background:var(--brand);color:#fff;border:0;border-radius:7px;
  font:inherit;font-size:13px;font-weight:500;padding:9px;cursor:default;transition:transform .12s;
}
.genbtn.press{transform:scale(.97);background:var(--brand-ink)}
.status{font-size:12px;color:var(--faint);margin-top:8px;min-height:17px}
.ms{
  display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;
  color:var(--accent);background:#E7F1EB;border-radius:99px;padding:2px 8px;
  opacity:0;transition:opacity .3s;letter-spacing:.02em;
}
.ms.in{opacity:1}

.options{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.opt{
  border:1px solid var(--line);border-radius:7px;padding:8px;background:var(--surface-2);
  opacity:0;transform:translateY(5px);transition:opacity .35s,transform .35s,border-color .2s,background .2s;
}
.opt.in{opacity:1;transform:none}
.opt.sel{border-color:var(--brand);background:#fff;box-shadow:0 0 0 2px rgba(23,59,87,.10)}
.opt .name{font-size:10.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);font-weight:600;margin-bottom:6px}
.opt.sel .name{color:var(--brand)}
.run{display:flex;gap:2px;height:30px;align-items:flex-end}
.cab{background:#DFE4E7;border:1px solid #C3CCD2;border-radius:2px;height:100%}
.opt.sel .cab{background:#D3DEE6;border-color:#A9BECC}
.cab.tall{background:#CBD5DA}
.opt .meta{font-size:10.5px;color:var(--faint);margin-top:6px}

.bom{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}
.bomline{
  display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);
  padding:2.5px 0;opacity:0;transform:translateY(3px);transition:opacity .28s,transform .28s;
}
.bomline.in{opacity:1;transform:none}
.bomline span:last-child{color:var(--ink)}
.quote{
  display:flex;justify-content:space-between;align-items:baseline;
  margin-top:10px;padding-top:10px;border-top:1px solid var(--line-strong);
}
.quote .lbl{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);font-weight:600}
.quote .amt{font-size:26px;font-weight:600;letter-spacing:-.02em}
.delta{font-size:12px;color:var(--accent);font-weight:500;opacity:0;transition:opacity .3s}
.delta.in{opacity:1}
.caption{font-size:12px;color:var(--faint);margin-top:10px;text-align:center}


/* ── 算一笔账 ── */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-top:26px}
.tab{
  border:1px solid var(--line-strong);background:transparent;color:var(--muted);
  font:inherit;font-size:14px;font-weight:500;padding:9px 16px;border-radius:8px;cursor:pointer;
}
.tab:hover{border-color:var(--ink);color:var(--ink)}
.tab.on{background:var(--brand);border-color:var(--brand);color:#fff}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px;margin-top:22px;align-items:start}
@media(max-width:820px){.calc{grid-template-columns:1fr}}
.pane{display:none}
.pane.on{display:block}
.inputs{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.inp{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:9px 0;border-bottom:1px solid var(--line)}
.inp:last-child{border-bottom:0}
.inp label{font-size:14px;color:var(--muted);flex:1}
.inp input{
  width:92px;flex:none;text-align:right;font:inherit;font-size:15px;font-weight:600;
  font-variant-numeric:tabular-nums;color:var(--ink);
  border:1px solid var(--line-strong);border-radius:6px;padding:6px 9px;background:var(--surface-2);
}
.inp input:focus{outline:0;border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(23,59,87,.09)}
.out{background:var(--brand);color:#fff;border-radius:var(--radius);padding:22px}
.out .big{font-size:38px;font-weight:600;letter-spacing:-.03em;font-variant-numeric:tabular-nums;line-height:1.1}
.out .biglbl{font-size:12px;text-transform:uppercase;letter-spacing:.07em;opacity:.72;font-weight:600;margin-bottom:6px}
.out .rows{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.18)}
.out .r{display:flex;justify-content:space-between;gap:12px;font-size:14px;padding:5px 0;opacity:.9}
.out .r b{font-weight:600;font-variant-numeric:tabular-nums}
.out .note{font-size:12px;opacity:.65;margin-top:16px;line-height:1.5}

/* ── generic blocks ── */
.cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px;align-items:start}
@media(max-width:860px){.cols{grid-template-columns:1fr;gap:28px}}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:38px}
@media(max-width:760px){.cards{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{font-size:17px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}

.doc{background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);padding:18px 20px;font-size:13.5px}
.doc .row{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-bottom:1px dashed var(--line)}
.doc .row:last-child{border-bottom:0}
.doc .row.head{border-bottom:1px solid var(--line-strong);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);padding-bottom:8px}
.tag{font-size:10.5px;font-weight:600;padding:2px 7px;border-radius:99px;letter-spacing:.03em;white-space:nowrap}
.tag.inc{background:#E7F1EB;color:var(--accent)}
.tag.exc{background:#F1EEE8;color:var(--warn)}
.tag.oth{background:#ECEEF0;color:var(--muted)}

.flow{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;margin-top:34px}
.step{
  flex:1 1 150px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;position:relative;
}
.step .n{font-size:11px;font-weight:700;color:var(--brand);letter-spacing:.06em}
.step h3{font-size:15px;margin:6px 0 5px}
.step p{font-size:13px;color:var(--muted)}

.lists{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin-top:34px}
@media(max-width:760px){.lists{grid-template-columns:1fr}}
.lists ul{list-style:none;margin:14px 0 0;padding:0}
.lists li{padding:7px 0;border-bottom:1px solid var(--line);font-size:14.5px;display:flex;gap:10px;align-items:flex-start}
.lists li:last-child{border-bottom:0}
.ic{flex:none;width:16px;text-align:center;font-weight:700;line-height:1.5}
.have .ic{color:var(--accent)}
.later{opacity:.8}
.later .ic{color:var(--faint)}
.list-title{font-size:12px;text-transform:uppercase;letter-spacing:.08em;font-weight:700;color:var(--faint)}

.cta{text-align:center;border-bottom:0}
.cta h2{max-width:20ch;margin:0 auto}
.cta .lede{margin-left:auto;margin-right:auto}
.cta .cta-row{justify-content:center}

footer{padding:34px 0 48px;color:var(--faint);font-size:13px}
.legal{font-size:11.5px;line-height:1.55;color:#9AA0A3;max-width:78ch;margin-bottom:18px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.foot{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.foot .sp{flex:1}

[data-lang="zh"] body,body.zh{font-family:"Noto Sans SC","Inter",-apple-system,sans-serif}
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}

/* 从 index.html 的内联 style 属性搬过来（2026-09-20，为了让 CSP 能去掉 'unsafe-inline'） */
.demo-title{margin-left:6px}
.ms-slot{min-height:20px;margin-bottom:6px}


/* ── 三段主轴：快 → 省 → 成交 ── */
.ladder-sec{padding:56px 0;background:var(--surface);border-bottom:1px solid var(--line)}
.ladder{display:flex;gap:18px;align-items:stretch}
@media(max-width:860px){.ladder{flex-direction:column;gap:14px}}
.rung{flex:1 1 0;min-width:0}
.rung .rn{
  font-size:11px;font-weight:700;letter-spacing:.10em;color:var(--brand);
  margin-bottom:9px;font-variant-numeric:tabular-nums;
}
.rung h3{font-size:19px;margin-bottom:7px;letter-spacing:-.015em}
.rung p{font-size:14.5px;color:var(--muted)}
.rarrow{
  flex:none;align-self:center;color:var(--line-strong);font-size:20px;line-height:1;
  padding:0 2px;user-select:none;
}
@media(max-width:860px){.rarrow{display:none}}
.ladder-kick{
  margin-top:30px;padding-top:20px;border-top:1px solid var(--line);
  font-size:15px;color:var(--ink);max-width:70ch;
}