:root{
  --brand:#0559FF; --brand-d:#0442C8;
  --ink:#0B1324; --muted:#4A5568; --paper:#FFFFFF; --surface:#F4F6FB;
  --free:#0F766E; --paid:#B45309; --line:#D9DEE8;
  --r:16px; --rb:24px; --rs:4px;
  --w:1160px;
}
@media (prefers-color-scheme:dark){
  :root{--brand:#7AA2FF; --brand-d:#A8C2FF; --ink:#E8EDF7; --muted:#A8B3C7;
        --paper:#0C111B; --surface:#141C2B; --free:#5EEAD4; --paid:#FBBF24; --line:#263349;}
}
@font-face{font-family:Spectral;src:url(/assets/font/spectral.woff2?v=33faca8b5795) format('woff2');
  font-weight:600;font-style:normal;font-display:swap;}
@font-face{font-family:'Inter Tight';src:url(/assets/font/intertight.woff2?v=77fefe8ca19b) format('woff2');
  font-weight:400 600;font-style:normal;font-display:swap;}
@font-face{font-family:'JetBrains Mono';src:url(/assets/font/jetbrains.woff2?v=cb182feeed4d) format('woff2');
  font-weight:500;font-style:normal;font-display:swap;}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font:400 17px/1.62 'Inter Tight',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-synthesis-weight:none;}
main img,main svg{max-width:100%}
h1,h2,h3{font-family:Spectral,Georgia,serif;font-weight:600;line-height:1.18;margin:0 0 .5em;
  letter-spacing:-.01em;}
h1{font-size:clamp(30px,4.4vw,46px)}
h2{font-size:clamp(23px,2.7vw,31px)}
h3{font-size:19px;font-family:'Inter Tight',sans-serif;font-weight:600;letter-spacing:0}
p{margin:0 0 1em;max-width:68ch}
a{color:var(--brand-d)}
@media (prefers-color-scheme:dark){a{color:var(--brand)}}
b,strong{font-weight:600}
.sb-wrap{width:min(100% - 40px,var(--w));margin-inline:auto}
.sb-skip{position:absolute;width:1px;height:1px;overflow:hidden;
  clip-path:inset(50%);white-space:nowrap}
.sb-skip:focus{position:fixed;left:12px;top:12px;width:auto;height:auto;clip-path:none;
  z-index:50;background:var(--paper);display:inline-flex;align-items:center;min-height:44px;
  padding:0 16px;border:2px solid var(--brand);border-radius:var(--rs)}

/* 页眉 ---------------------------------------------------------------- */
.sb-head{border-bottom:1px solid var(--line);background:var(--paper);position:relative;z-index:10}
.sb-head__in{display:flex;align-items:center;gap:20px;min-height:68px}
.sb-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;
  padding:6px 0;flex:0 0 auto;min-height:44px}
.sb-brand__m{flex:0 0 auto;background:#fff;border-radius:7px;padding:5px 8px;
  line-height:0;border:1px solid var(--line)}
.sb-brand__m img{display:block;width:112px;height:22px}
.sb-brand__t{display:flex;flex-direction:column;line-height:1.14}
.sb-brand__t b{font-family:Spectral,serif;font-size:17px;font-weight:600;
  letter-spacing:.01em}
.sb-brand__t i{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:.02em}
.sb-nav{margin-left:auto;display:flex;flex-wrap:nowrap;gap:2px}
.sb-nav a{display:flex;align-items:center;justify-content:center;min-height:44px;
  min-width:44px;padding:0 10px;font-size:15px;text-decoration:none;color:var(--ink);
  border-radius:var(--rs);white-space:nowrap}
.sb-nav a:hover{background:var(--surface);color:var(--brand-d)}
.sb-nav a[aria-current]{box-shadow:inset 0 -2px 0 var(--brand);color:var(--brand-d)}
.sb-burger{display:none;margin-left:auto;min-height:44px;min-width:76px;padding:0 14px;
  border:1px solid var(--line);border-radius:var(--rb);background:var(--paper);
  color:var(--ink);font:inherit;font-size:15px}

/* hero ---------------------------------------------------------------- */
.sb-hero{padding:56px 0 36px;background:
  radial-gradient(1100px 320px at 12% -10%,rgba(5,89,255,.12),transparent 70%),var(--surface);
  border-bottom:1px solid var(--line)}
.sb-hero h1{max-width:19ch}
.sb-hero .sb-lede{font-size:19px;color:var(--muted);max-width:60ch;margin-bottom:26px}
.sb-find{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;max-width:790px}
.sb-find label{flex:1 0 100%;font-size:13px;color:var(--muted);letter-spacing:.04em;
  text-transform:uppercase}
.sb-find input{flex:1 1 320px;min-height:56px;padding:0 18px;font:inherit;font-size:17px;
  color:var(--ink);background:var(--paper);border:1.5px solid var(--line);
  border-radius:var(--rb)}
.sb-find input:focus-visible{outline:3px solid var(--brand);outline-offset:1px;
  border-color:var(--brand)}
.sb-find button{min-height:56px;padding:0 30px;border:0;border-radius:var(--rb);
  background:var(--brand);color:#fff;font:inherit;font-weight:600;font-size:17px;cursor:pointer}
.sb-find button:hover{background:var(--brand-d)}
@media (prefers-color-scheme:dark){.sb-find button{color:#07122B}}
.sb-sub{display:flex;flex-wrap:wrap;gap:4px 22px;margin-top:20px}
.sb-sub a{font-size:15px;color:var(--muted);text-underline-offset:3px;
  display:inline-flex;align-items:center;min-height:44px;min-width:44px}
.sb-sub a:hover{color:var(--brand-d)}

/* 区块 ---------------------------------------------------------------- */
.sb-sec{padding:52px 0;border-bottom:1px solid var(--line)}
.sb-sec:last-child{border-bottom:0}
.sb-eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-d);
  margin:0 0 6px;font-weight:600}
.sb-lede{font-size:18px;color:var(--muted)}
.sb-split{display:grid;grid-template-columns:1fr minmax(260px,620px);gap:36px;
  align-items:stretch}
.sb-split--figl{grid-template-columns:minmax(260px,620px) 1fr}
.sb-split--figl .sb-col{order:2}
.sb-col>*:last-child{margin-bottom:0}
.sb-fig{margin:0;display:flex;flex-direction:column}
.sb-fig img{display:block;width:100%;height:auto;border:1px solid var(--line);
  border-radius:var(--r);background:#fff}
.sb-split .sb-fig img{flex:1 1 auto;object-fit:contain;object-position:top center;
  background:#fff}
/* 官方界面截图不能裁：cover 会把左半边切掉，读者看到的是半张图（实测）。
   contain + 顶对齐既保住硬门 4 的等高，又保住画面完整。 */
.sb-fig figcaption{font-size:13.5px;color:var(--muted);margin-top:10px;max-width:72ch}
.sb-fig--band{margin-top:22px}
.sb-fig--band img{width:100%}
.sb-dot{padding:0 6px;opacity:.5}
.sb-srcnote{font-size:13.5px;color:var(--muted)}

/* signature 1：阶段轨 --------------------------------------------------- */
.sb-rail{list-style:none;margin:26px 0 0;padding:0 0 0 38px;position:relative}
.sb-rail::before{content:"";position:absolute;left:12px;top:6px;bottom:6px;width:1px;
  background:var(--line)}
.sb-rail__i{position:relative;padding:0 0 30px}
.sb-rail__i:last-child{padding-bottom:0}
.sb-rail__n{position:absolute;left:-38px;top:1px;width:25px;height:25px;border-radius:5px;
  background:var(--brand);color:#fff;font:500 13px/25px 'JetBrains Mono',monospace;
  text-align:center}
@media (prefers-color-scheme:dark){.sb-rail__n{color:#07122B}}
.sb-rail__s{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
  margin:0 0 2px}
.sb-rail__i h3{margin:0 0 .35em}
.sb-rail__i p{margin:0 0 .5em}

/* signature 2：行式价目表 ------------------------------------------------ */
.sb-ledger{list-style:none;margin:22px 0 0;padding:0;border-top:1px solid var(--line)}
.sb-ledger__r{display:grid;grid-template-columns:1fr auto;gap:2px 20px;padding:13px 0;
  border-bottom:1px solid var(--line)}
.sb-ledger__l{font-weight:600}
.sb-ledger__p{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:14.5px;
  white-space:nowrap;text-align:right;color:var(--paid)}
.sb-ledger__p i{font-style:normal;display:block;font-size:11.5px;color:var(--muted);
  letter-spacing:.02em}
.sb-ledger__r--free .sb-ledger__p{color:var(--free)}
.sb-ledger__n{grid-column:1/-1;font-size:14.5px;color:var(--muted);max-width:74ch}
.sb-ledger__f{font-size:13.5px;color:var(--muted);margin-top:12px}

/* 分类墙 -------------------------------------------------------------- */
.sb-sec--wall{background:var(--surface)}
.sb-wall{list-style:none;margin:26px 0 0;padding:0;display:grid;gap:14px;
  grid-template-columns:repeat(4,1fr)}
.sb-tile a{display:flex;flex-direction:column;height:100%;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;text-decoration:none;
  color:inherit;position:relative}
.sb-tile a:hover{border-color:var(--brand);box-shadow:0 6px 22px rgba(5,89,255,.10)}
.sb-tile img{display:block;width:100%;height:auto;aspect-ratio:1;object-fit:cover}
.sb-tile__b{position:absolute;top:9px;left:9px;font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;background:var(--paper);color:var(--muted);
  border:1px solid var(--line);border-radius:var(--rs);padding:3px 7px}
.sb-tile__t{font-weight:600;padding:12px 14px 2px}
.sb-tile__n{font-size:13.5px;color:var(--muted);padding:0 14px 14px}

/* 表格 ---------------------------------------------------------------- */
.sb-tw{overflow-x:auto;margin:22px 0 0}
.sb-t{width:100%;border-collapse:collapse;font-size:15.5px}
.sb-t th,.sb-t td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);
  vertical-align:top}
.sb-t th{font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
  font-weight:600;white-space:nowrap}
.sb-t td b{font-family:'JetBrains Mono',monospace;font-weight:500;font-size:14.5px}

/* 小件 ---------------------------------------------------------------- */
.sb-call{border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:var(--rs);
  padding:18px 20px;margin:24px 0;background:var(--surface)}
.sb-call h3{margin:0 0 .4em}
.sb-call p:last-child{margin-bottom:0}
.sb-call--warn{border-left-color:var(--paid)}
.sb-q{border-bottom:1px solid var(--line);padding:4px 0}
.sb-q summary{cursor:pointer;font-weight:600;padding:14px 0;min-height:44px;
  display:flex;align-items:center}
.sb-q summary::marker{color:var(--brand)}
.sb-q p{margin:0 0 14px}
.sb-cta{margin:26px 0 0;font-size:15.5px;color:var(--muted)}
.sb-cta__a{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;
  margin-left:4px;border:1.5px solid var(--brand);border-radius:var(--rb);
  color:var(--brand-d);text-decoration:none;font-weight:600}
.sb-cta__a:hover{background:var(--brand);color:#fff}
@media (prefers-color-scheme:dark){.sb-cta__a:hover{color:#07122B}}

/* 工具 ---------------------------------------------------------------- */
.sb-tool{border:1px solid var(--line);border-radius:var(--r);padding:22px;margin-top:24px;
  background:var(--surface)}
.sb-tool__g{display:grid;gap:16px;grid-template-columns:repeat(2,minmax(0,1fr))}
.sb-tool label{display:block;font-size:13px;letter-spacing:.04em;text-transform:uppercase;
  color:var(--muted);margin-bottom:6px}
.sb-tool select,.sb-tool input[type=number]{width:100%;min-height:46px;padding:0 12px;
  font:inherit;color:var(--ink);background:var(--paper);border:1.5px solid var(--line);
  border-radius:var(--rs)}
.sb-tool fieldset{border:0;padding:0;margin:18px 0 0;grid-column:1/-1}
.sb-tool legend{padding:0;font-size:13px;letter-spacing:.04em;text-transform:uppercase;
  color:var(--muted)}
.sb-opts{display:grid;gap:8px 18px;grid-template-columns:repeat(2,minmax(0,1fr));margin-top:10px}
.sb-opts label{display:flex;gap:9px;align-items:center;text-transform:none;letter-spacing:0;
  font-size:15.5px;color:var(--ink);min-height:44px;margin:0}
.sb-opts input{width:19px;height:19px;accent-color:var(--brand);flex:0 0 auto}
.sb-out{margin-top:20px;border-top:1px solid var(--line);padding-top:16px}
.sb-out__r{display:flex;justify-content:space-between;gap:16px;padding:7px 0;font-size:15.5px}
.sb-out__r b{font-family:'JetBrains Mono',monospace;font-weight:500}
.sb-out__t{border-top:1px solid var(--line);margin-top:8px;padding-top:12px;font-weight:600}
.sb-out__t b{font-size:21px;color:var(--brand-d)}
.sb-out__w{font-size:14px;color:var(--muted);margin-top:12px}

/* 页脚 ---------------------------------------------------------------- */
.sb-foot{background:var(--surface);border-top:1px solid var(--line);padding:40px 0 56px;
  margin-top:0}
.sb-foot__n{display:flex;flex-wrap:wrap;gap:2px 18px;margin-bottom:18px}
.sb-foot__n a{font-size:15px;color:var(--ink);text-decoration:none;
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px}
.sb-foot__n a:hover{color:var(--brand-d);text-decoration:underline}
.sb-foot__d{font-size:14.5px;color:var(--muted);max-width:86ch}
.sb-foot__c{font-size:13.5px;color:var(--muted)}

/* 自适应 -------------------------------------------------------------- */
@media (max-width:1080px){
  .sb-wall{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:1100px){
  .sb-burger{display:inline-flex;align-items:center;justify-content:center}
  .sb-nav{display:none;margin:0;width:100%;flex-direction:column;gap:0;
    border-top:1px solid var(--line);padding:6px 0}
  .sb-nav.is-open{display:flex}
  .sb-nav a{justify-content:flex-start}
  .sb-head__in{flex-wrap:wrap}
}
@media (max-width:900px){
  .sb-split,.sb-split--figl{grid-template-columns:1fr}
  .sb-split--figl .sb-col{order:0}
  .sb-tool__g,.sb-opts{grid-template-columns:1fr}
}
@media (max-width:780px){
  .sb-brand__t i{display:none}
  .sb-brand__m img{width:92px;height:18px}
}
@media (max-width:620px){
  body{font-size:16px}
  .sb-wall{grid-template-columns:repeat(2,1fr)}
  .sb-sec{padding:38px 0}
  .sb-hero{padding:38px 0 30px}
  .sb-ledger__r{grid-template-columns:1fr}
  .sb-ledger__p{text-align:left}
  .sb-t,.sb-t thead,.sb-t tbody,.sb-t tr,.sb-t td{display:block}
  .sb-t thead{display:none}
  .sb-t tr{border:1px solid var(--line);border-radius:var(--r);margin-bottom:12px;padding:6px 4px}
  .sb-t td{border:0;padding:7px 12px}
  .sb-t td::before{content:attr(data-label);display:block;font-size:11.5px;
    letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important}
}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px}