/* Layout: case-file. Sticky header (brand, tabs, language); one reading column for guides; two-pane builder (form | A4 sheet). Violet = official stamp ink. */
:root{
  --paper:#F3F5F8; --surface:#FFFFFF; --sheet:#FFFFFF; --ink:#172031; --muted:#5B6578; --line:#D8DDE6;
  --stamp:#5A3EA5; --stamp-soft:#ECE6FA; --on-stamp:#FFFFFF; --ok:#1E7A4C; --ok-soft:#E3F3EA; --warn:#9A5800; --warn-soft:#FBF0DD;
  --bad:#B02A20; --bad-soft:#FBE7E5; --fill:#FFEFA0; --fill-ink:#3B3000; --shadow:0 1px 2px rgba(23,32,49,.06),0 6px 24px rgba(23,32,49,.06);
  --cjk:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC";
  --f-display:"PT Serif", Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --f-body:"Golos Text", system-ui, -apple-system, "Segoe UI", Roboto, Arial, var(--cjk), sans-serif;
  --f-mono:"JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --r:10px;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --paper:#0F131B; --surface:#161C27; --sheet:#1B2230; --ink:#E6E9F0; --muted:#9BA4B5; --line:#2A3242;
  --stamp:#AE98F4; --stamp-soft:#2A2342; --on-stamp:#141024; --ok:#62C793; --ok-soft:#14291E; --warn:#E6A84E; --warn-soft:#2E2210;
  --bad:#F28B82; --bad-soft:#331816; --fill:#5C4E10; --fill-ink:#FFF4C2; --shadow:0 1px 2px rgba(0,0,0,.4); color-scheme:dark; } }
:root[data-theme="dark"]{
  --paper:#0F131B; --surface:#161C27; --sheet:#1B2230; --ink:#E6E9F0; --muted:#9BA4B5; --line:#2A3242;
  --stamp:#AE98F4; --stamp-soft:#2A2342; --on-stamp:#141024; --ok:#62C793; --ok-soft:#14291E; --warn:#E6A84E; --warn-soft:#2E2210;
  --bad:#F28B82; --bad-soft:#331816; --fill:#5C4E10; --fill-ink:#FFF4C2; --shadow:0 1px 2px rgba(0,0,0,.4); color-scheme:dark; }

*{box-sizing:border-box}
[hidden]{display:none!important}
html:lang(zh) body{letter-spacing:.01em}
body{background:var(--paper);color:var(--ink);font:16px/1.6 var(--f-body);margin:0;overflow-wrap:break-word}
.panel a,.prose a,td a,.small a{overflow-wrap:anywhere}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--surface)}
a{color:var(--stamp)} a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--stamp);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;line-height:1.22;margin:0}
h1{font-size:clamp(1.8rem,4.2vw,2.8rem)} h2{font-size:1.55rem} h3{font-size:1.16rem}
p{margin:0}
code,.ref{font-family:var(--f-mono);font-size:.86em}
.ref{background:var(--stamp-soft);color:var(--stamp);padding:.05em .4em;border-radius:4px;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.col{max-width:74ch}
.doc{display:grid;grid-template-columns:minmax(0,1fr) 250px;column-gap:40px;align-items:start}
.toc{position:sticky;top:110px;display:grid;gap:14px;font-size:.9rem;border-left:1px solid var(--line);padding-left:18px;max-height:calc(100vh - 130px);overflow:auto}
.toc ol{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.toc ol a{display:block;padding:4px 8px;margin-left:-8px;border-radius:6px;color:var(--muted);text-decoration:none;line-height:1.35}
.toc ol a:hover{color:var(--ink);background:var(--paper)}
.toc ol a[aria-current="true"]{color:var(--stamp);background:var(--stamp-soft);font-weight:600}
.toc .eyebrow{margin:0}
.toc ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.prose h2[id]{scroll-margin-top:120px}
@media (max-width:960px){ .doc{grid-template-columns:minmax(0,1fr)} .toc{display:none} }
.prose{display:grid;gap:12px}
.prose h2{margin-top:10px} .prose h3{margin-top:6px}
.prose ul,.prose ol{margin:0;padding-left:1.2em;display:grid;gap:6px}
.muted{color:var(--muted)}
.small{font-size:.88rem}
.lead{font-size:1.1rem}

header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--surface);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;column-gap:14px;row-gap:4px;padding-block:8px;flex-wrap:wrap}
.top .brand{order:1}
.top .hdr-r{order:2}
.top nav.tabs{order:3;flex:1 1 100%;margin-left:-10px}
.brand{font-family:var(--f-display);font-weight:700;font-size:1.06rem;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px}
.brand .seal{width:28px;height:28px;border:2px solid var(--stamp);border-radius:50%;display:grid;place-items:center;color:var(--stamp);font:700 10px/1 var(--f-mono)}
nav.tabs{display:flex;gap:2px;flex-wrap:wrap;flex:1 1 auto}
nav.tabs a{padding:6px 10px;border-radius:999px;text-decoration:none;color:var(--muted);font-weight:500;font-size:.94rem}
nav.tabs a[aria-current="page"]{background:var(--stamp-soft);color:var(--stamp)}
nav.tabs a:hover{color:var(--ink)}
.langs{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:2px}
.langs button{font:600 .8rem/1 var(--f-mono);letter-spacing:.04em;border:0;background:transparent;color:var(--muted);padding:6px 9px;border-radius:999px;cursor:pointer}
.langs button[aria-pressed="true"]{background:var(--stamp);color:var(--on-stamp)}
.hdr-r{display:flex;align-items:center;gap:8px;margin-left:auto}
.tg{display:inline-flex;align-items:center;gap:6px;color:var(--stamp);border:1px solid var(--line);border-radius:999px;padding:4px 11px 4px 8px;text-decoration:none;font-weight:600;font-size:.88rem}
.tg:hover{background:var(--stamp-soft)}
.tgcta{margin-top:14px}
.tgcta a{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:600}
.tgcta a span{text-decoration:underline;text-underline-offset:3px}
@media (max-width:520px){ .tg span{display:none} .tg{padding:6px} }
main{padding-block:28px 64px}
section.view{display:grid;gap:26px}
section.view>*,.grid2>*,.grid3>*,.builder>*,.calc>*,.panel>*,.prose>*,.form>*{min-width:0}
ul.clean li{overflow-wrap:anywhere}

.hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:start}
.hero .lead{margin-top:14px;max-width:62ch}
.stamp{transform:rotate(-8deg);border:3px double var(--stamp);color:var(--stamp);border-radius:10px;padding:10px 16px;text-align:center;font-family:var(--f-mono);letter-spacing:.06em;opacity:.9;margin-top:8px}
.stamp b{display:block;font-size:1.3rem}
.stamp span{font-size:.7rem;text-transform:uppercase;display:block}
.facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.fact{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px;display:grid;gap:4px;align-content:start}
.fact b{font-family:var(--f-display);font-size:1.45rem;font-variant-numeric:tabular-nums}
.fact span{color:var(--muted);font-size:.9rem}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:grid;gap:12px;min-width:0;align-content:start}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.cityblock{display:grid;gap:10px}
.bfilters{display:flex;flex-wrap:wrap;gap:12px 16px;align-items:end}
.citypick{position:relative;flex:1 1 300px;max-width:440px;display:grid;gap:4px}
.citypick>label{font-size:.9rem;font-weight:600}
.bname{flex:1 1 220px;max-width:320px}
.cp-field{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:0 6px 0 10px;color:var(--stamp)}
.cp-field:focus-within{border-color:var(--stamp);box-shadow:0 0 0 3px var(--stamp-soft)}
.cp-field input{border:0;outline:0;background:transparent;padding:10px 0;flex:1;font-size:1rem}
.cp-x{all:unset;cursor:pointer;color:var(--muted);font-size:1.3rem;line-height:1;padding:4px 8px;border-radius:6px}
.cp-x:hover{color:var(--ink);background:var(--paper)}
#city-list{position:absolute;z-index:6;left:0;right:0;top:100%;margin:4px 0 0;padding:4px;list-style:none;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 28px rgba(16,20,40,.16);max-height:340px;overflow:auto}
#city-list li.cp-h{display:block;cursor:default;padding:8px 10px 4px;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
#city-list li{display:flex;justify-content:space-between;gap:12px;padding:8px 10px;border-radius:6px;cursor:pointer}
#city-list li[aria-selected="true"],#city-list li[data-i]:hover{background:var(--stamp-soft)}
.cp-chips{display:flex;flex-wrap:wrap;gap:6px}
.cp-chips button{font:inherit;font-size:.86rem;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:4px 11px;cursor:pointer}
.cp-chips button:hover{border-color:var(--stamp)}
.cp-chips button span{color:var(--muted);margin-left:6px;font-size:.78rem}
.cp-chips button[aria-pressed="true"]{background:var(--stamp);border-color:var(--stamp);color:var(--on-stamp)}
.cp-chips button[aria-pressed="true"] span{color:inherit;opacity:.85}
.cp-chips .cp-all{border-style:dashed;color:var(--muted)}
.incity{margin-top:4px}
tr.dim td{opacity:.55}
.cityres{display:grid;gap:12px}
.brgroups{display:grid;gap:8px}
.brgroup{border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.brgroup>summary{padding:12px 16px;cursor:pointer;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.brgroup>summary a{margin-left:auto}
.brlist{list-style:none;margin:0;padding:0 16px 6px}
.brlist.flat{padding:0}
.brlist li{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr) auto;gap:6px 16px;padding:10px 0;border-top:1px solid var(--line);align-items:start}
.brlist.flat li:first-child{border-top:0}
.nowrap{white-space:nowrap}
.bb-city{max-width:360px}
@media (max-width:640px){ .brlist li{grid-template-columns:minmax(0,1fr)} .brgroup>summary a{margin-left:0} }
.stack{display:grid;gap:14px;align-content:start;min-width:0}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.linkbtn{all:unset;cursor:pointer;color:var(--stamp);text-decoration:underline;text-underline-offset:3px}
.linkbtn:focus-visible{outline:2px solid var(--stamp);outline-offset:2px}
.who{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:grid;gap:8px;align-content:start}
.who.active{border-color:var(--stamp);box-shadow:0 0 0 1px var(--stamp) inset;background:var(--stamp-soft)}
.who-pick{all:unset;cursor:pointer;display:grid;gap:8px;text-align:left;border-radius:6px}
.who-pick:focus-visible{outline:2px solid var(--stamp);outline-offset:4px}
.who .tag{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--stamp)}
.eyebrow{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.chip{display:inline-flex;align-items:center;gap:6px;padding:2px 9px;border-radius:999px;font-size:.8rem;font-weight:600;white-space:nowrap}
.chip.ok{background:var(--ok-soft);color:var(--ok)} .chip.warn{background:var(--warn-soft);color:var(--warn)} .chip.bad{background:var(--bad-soft);color:var(--bad)} .chip.n{background:var(--paper);color:var(--muted);border:1px solid var(--line)}
.note{border-left:3px solid var(--warn);background:var(--warn-soft);padding:12px 14px;border-radius:0 8px 8px 0}
.note.bad{border-color:var(--bad);background:var(--bad-soft)}
.note.ok{border-color:var(--ok);background:var(--ok-soft)}
ul.clean{margin:0;padding-left:1.1em;display:grid;gap:6px}

ol.steps{list-style:none;margin:0;padding:0;display:grid}
ol.steps>li{display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px;padding-bottom:18px;position:relative}
ol.steps>li::before{content:counter(list-item);font:700 1rem/1 var(--f-mono);width:34px;height:34px;border-radius:50%;border:2px solid var(--stamp);color:var(--stamp);display:grid;place-items:center;background:var(--surface);z-index:1}
ol.steps>li:not(:last-child)::after{content:"";position:absolute;left:16px;top:34px;bottom:0;width:2px;background:var(--line)}
ol.steps>li>div{display:grid;gap:6px}
.term{font-family:var(--f-mono);font-size:.84rem;color:var(--muted)}

.calc{display:grid;grid-template-columns:minmax(0,280px) minmax(0,1fr);gap:18px}
label{display:grid;gap:4px;font-size:.9rem;font-weight:500}
label.inline{display:flex;gap:8px;align-items:center;font-weight:500}
input,select,textarea{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:8px 10px;width:100%;min-width:0}
input[type=checkbox]{width:auto}
table{border-collapse:collapse;width:100%}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.tablewrap table tr:last-child td{border-bottom:0}
tr.rowlink{cursor:pointer} tr.rowlink:hover td{background:var(--stamp-soft)}

.kv{display:grid;grid-template-columns:minmax(0,190px) minmax(0,1fr);gap:6px 16px;margin:0}
.kv dt{color:var(--muted);font-size:.9rem} .kv dd{margin:0;min-width:0;overflow-wrap:anywhere}
.addr{font-family:var(--f-mono);font-size:.9rem;background:var(--paper);border:1px dashed var(--line);border-radius:8px;padding:10px 12px;white-space:pre-line;overflow-wrap:anywhere}
.copyrow{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
button.btn{font:inherit;font-weight:600;border-radius:8px;padding:8px 14px;border:1px solid var(--stamp);background:var(--stamp);color:var(--on-stamp);cursor:pointer}
button.btn.ghost{background:transparent;color:var(--stamp)}
button.btn:hover{filter:brightness(1.08)}
a.btn{display:inline-block;text-decoration:none;font-weight:600;border-radius:8px;padding:8px 14px;border:1px solid var(--stamp);color:var(--stamp)}

.builder{display:grid;grid-template-columns:minmax(0,330px) minmax(0,1fr);gap:20px;align-items:start}
.form{display:grid;gap:10px}
.form fieldset{border:1px solid var(--line);border-radius:var(--r);padding:12px;display:grid;gap:10px;margin:0;min-width:0}
.form legend{font-weight:600;padding:0 4px}
.sheet{background:var(--sheet);border:1px solid var(--line);border-radius:4px;box-shadow:var(--shadow);padding:clamp(18px,4vw,48px);font:15px/1.5 "Times New Roman",Times,serif;color:var(--ink);min-width:0;overflow-wrap:anywhere}
.sheet p{margin:0 0 6px}
.sheet .rcp{margin-left:45%;font-weight:700;margin-bottom:0}
.sheet .snd{margin:0}
.sheet .subj{font-weight:700;margin:14px 0 10px}
.sheet .h{font-weight:700;margin-top:10px}
.sheet .li{padding-left:1.4em;text-indent:-1em}
.sheet .box{border:1px solid var(--muted);padding:8px 10px;margin-top:14px;font-size:13px;white-space:pre-line}
.sheet mark{background:var(--fill);color:var(--fill-ink);padding:0 2px;border-radius:2px}
.sheet .filled{border-bottom:1px dotted var(--stamp)}
.sticky{position:sticky;top:80px}
.explain{background:var(--stamp-soft);border-radius:var(--r);padding:12px 14px}

details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 16px}
details+details{margin-top:8px}
summary{cursor:pointer;font-weight:600}
details[open] summary{margin-bottom:8px}
blockquote{margin:0;border-left:3px solid var(--stamp);padding:4px 0 4px 12px;font-family:var(--f-display);font-style:italic}
#comments{border-top:1px solid var(--line);padding-top:20px}
footer{border-top:1px solid var(--line);padding-block:24px;color:var(--muted);font-size:.88rem}

@media (max-width:880px){
  .builder,.calc,.hero{grid-template-columns:minmax(0,1fr)}
  .sticky{position:static}
  .facts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid3,.grid2{grid-template-columns:minmax(0,1fr)}
  .kv{grid-template-columns:minmax(0,1fr)} .kv dt{margin-top:6px}
  .stamp{justify-self:start}
}
@media (max-width:420px){ .facts{grid-template-columns:minmax(0,1fr)} }
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}