/* AI 实验室：只用 shared-nav.css 里的颜色与字体变量，深色模式自动生效。 */
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--cr-nav-height,64px) + 16px)}
body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.7 var(--font-sans)}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--accent-text)}
[hidden]{display:none!important}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.skip{position:fixed;top:-100px;left:16px;background:var(--accent);color:var(--accent-ink);padding:10px 14px;z-index:100}
.skip:focus{top:8px}
main{max-width:1360px;margin:0 auto;padding:0 40px}
.eyebrow{font-size:10.5px;letter-spacing:2px;font-weight:700;color:var(--muted);margin:0 0 12px}
.muted{color:var(--muted)}.small{font-size:12px}
code,.mono{font-family:var(--font-mono);font-size:12.5px}
code{background:var(--surface-2);padding:1px 5px;border-radius:3px}

.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:40px;padding:8px 16px;border:1px solid var(--line-strong);border-radius:4px;background:var(--surface);color:var(--ink);text-decoration:none;cursor:pointer;font-size:13px;font-weight:500;transition:background .15s,border-color .15s}
.button:hover{background:var(--surface-2)}
.button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.button.primary:hover{background:var(--accent-hover)}
.button.ghost{background:transparent}
.button.small{min-height:32px;padding:5px 12px;font-size:12.5px}
.button:disabled{opacity:.5;cursor:default}
.button.file{position:relative}
.text-button{border:0;background:none;color:var(--accent-text);cursor:pointer;font-size:12.5px;padding:6px 4px;font-weight:600;white-space:nowrap}
.text-button:hover{text-decoration:underline;text-underline-offset:3px}

/* hero */
.lab-hero{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center;padding:64px 0 44px}
.lab-hero h1{font-size:clamp(30px,3.4vw,48px);line-height:1.32;letter-spacing:-1.2px;font-weight:600;margin:0 0 20px}
.lab-hero h1 em{font-style:normal;font-family:var(--font-serif);font-weight:500;color:var(--accent-2)}
.lead{font-size:15px;line-height:1.95;color:var(--muted);margin:0 0 24px;max-width:64ch}
.actions{display:flex;flex-wrap:wrap;gap:10px}
.fine{font-size:12px;color:var(--faint);margin:18px 0 0;max-width:60ch}
.loop{margin:0;padding:22px;border:1px solid var(--line);background:var(--surface);border-radius:6px;position:relative}
.loop-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:34px 30px;position:relative}
.loop-node{position:relative;border:1px solid var(--line-strong);border-radius:6px;background:var(--paper);padding:12px 13px 13px;cursor:pointer;transition:border-color .15s,transform .15s}
.loop-node:hover{border-color:var(--accent-2);transform:translateY(-1px)}
.loop-node.cloud{background:var(--surface-2)}
.loop-node.judge{border:2px solid var(--accent-2);box-shadow:0 0 0 4px var(--accent-soft)}
.loop-node span{font:600 11px var(--font-mono);color:var(--faint)}
.loop-node b{display:block;font-size:14px;margin:2px 0 4px}
.loop-node small{display:block;font-size:11.5px;line-height:1.6;color:var(--muted)}
/* arrows: top row runs right, bottom row runs left, right column runs down, left column runs up */
.loop-node:nth-child(1)::after,.loop-node:nth-child(2)::after{content:"→";position:absolute;right:-22px;top:50%;transform:translateY(-50%);color:var(--faint)}
.loop-node:nth-child(5)::after,.loop-node:nth-child(6)::after{content:"←";position:absolute;left:-22px;top:50%;transform:translateY(-50%);color:var(--faint)}
.loop-node:nth-child(3)::before{content:"↓";position:absolute;bottom:-27px;left:50%;color:var(--faint)}
.loop-node:nth-child(4)::before{content:"↑";position:absolute;top:-27px;left:50%;color:var(--faint)}
.loop figcaption{margin-top:16px;font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.loop figcaption i{width:12px;height:12px;border-radius:2px;background:var(--surface-2);border:1px solid var(--line-strong)}
.facts{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0}
.facts div{padding:0 24px;border-right:1px solid var(--line);display:flex;flex-direction:column}
.facts div:first-child{padding-left:0}.facts div:last-child{border:0}
.facts strong{font:400 30px/1.25 var(--font-num)}
.facts span{font-size:11.5px;color:var(--muted);margin-top:4px}

/* workbench */
.bench{padding:48px 0 24px}
.bench-head{display:flex;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:18px}
.bench-head h2{margin:0;font-size:26px;letter-spacing:-.5px;font-weight:600}
.bench-head .eyebrow{margin-bottom:4px}
.bench-status{display:flex;gap:6px;flex-wrap:wrap;flex:1;font-size:12px}
.pill{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid var(--line);border-radius:99px;background:var(--surface);color:var(--muted);white-space:nowrap}
.pill b{color:var(--ink);font-weight:600}
.pill i{width:7px;height:7px;border-radius:50%;background:var(--faint)}
.pill[data-ok=true] i{background:var(--ok)}
.pill[data-ok=false] i{background:var(--warn)}
.bench-actions{display:flex;gap:6px;flex-wrap:wrap}
.demo-banner{margin:0 0 16px;padding:11px 14px;border:1px solid color-mix(in srgb,var(--gold) 55%,transparent);background:var(--gold-soft);border-radius:4px;font-size:13px;color:var(--ink-2)}
.demo-banner em{font-style:normal;font-weight:700;color:var(--danger)}
.steps{display:flex;gap:0;border-bottom:1px solid var(--line-strong);margin-bottom:22px;overflow-x:auto;scrollbar-width:thin}
.steps button{border:0;background:none;padding:12px 16px 11px;cursor:pointer;color:var(--muted);font-weight:600;font-size:13.5px;white-space:nowrap;border-bottom:3px solid transparent;margin-bottom:-1px}
.steps button span{font-family:var(--font-num);margin-right:6px;color:var(--faint)}
.steps button:hover{color:var(--ink)}
.steps button[aria-selected=true]{color:var(--ink);border-bottom-color:var(--accent-2)}
.steps button[aria-selected=true] span{color:var(--accent-2)}
.tab{animation:fade .18s ease}
@keyframes fade{from{opacity:.4}to{opacity:1}}
.split{display:grid;grid-template-columns:1.15fr 1fr;gap:18px;margin-bottom:22px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:20px 22px}
.card h3{margin:0 0 6px;font-size:16px}
.card h4{margin:18px 0 8px;font-size:13px;color:var(--muted)}
.card>p.muted{margin:0 0 14px;font-size:13px}
.form-row{display:flex;gap:12px;align-items:flex-end;margin:12px 0}
.form-row.wrap{flex-wrap:wrap}
.form-row label,.block{display:grid;gap:5px;font-size:12px;color:var(--muted)}
.form-row label.check{display:flex;align-items:center;gap:6px;min-height:40px}
.block{margin:10px 0}
input[type=number],select,textarea,input[type=text]{background:var(--paper);border:1px solid var(--line-strong);border-radius:4px;padding:8px 10px;min-height:38px;color:var(--ink);font-size:13.5px}
input[type=number]{width:110px}
textarea{width:100%;resize:vertical;line-height:1.6}
.checks{border:0;padding:0;margin:0;display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:13px}
.checks legend{font-size:12px;color:var(--muted);margin-bottom:5px;padding:0}
.checks label{display:flex;gap:5px;align-items:center;color:var(--ink)}
.btn-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;align-items:center}
.ai-line{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12.5px;padding:9px 12px;border:1px dashed var(--line-strong);border-radius:4px;background:var(--paper)}
.ai-line b{color:var(--ink)}
.stream{margin-top:14px;font-size:13px}
.stream:empty{display:none}
.stream details{border-left:2px solid var(--line-strong);padding-left:10px;margin-bottom:10px;color:var(--muted);font-size:12px}
.stream details div{white-space:pre-wrap;max-height:200px;overflow:auto}
.stream .live{white-space:pre-wrap;font-family:var(--font-mono);font-size:12px;max-height:220px;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:10px}
.stream .err{color:var(--danger)}
.stream .ok{color:var(--ok);font-weight:600}
.prompt{white-space:pre-wrap;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:16px;font:12px/1.65 var(--font-mono);max-height:420px;overflow:auto;color:var(--ink-2)}
.round-list{display:grid;gap:6px;font-size:12.5px;max-height:260px;overflow:auto}
.round-list div{display:flex;gap:10px;align-items:baseline;border-bottom:1px solid var(--line);padding:6px 0}
.round-list b{font-family:var(--font-num);font-size:15px;min-width:34px}
.round-list span{color:var(--muted)}
.round-list small{margin-left:auto;color:var(--faint);white-space:nowrap}
.seg{display:inline-flex;border:1px solid var(--line-strong);border-radius:4px;overflow:hidden}
.seg button{border:0;background:var(--surface);padding:6px 12px;font-size:12.5px;cursor:pointer;color:var(--muted);border-right:1px solid var(--line)}
.seg button:last-child{border-right:0}
.seg button[aria-pressed=true]{background:var(--accent-soft);color:var(--ink);font-weight:600}
.table-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:6px 0 10px}
.table-head h3{margin:0;font-size:16px;margin-right:auto}
.table-head .spacer{flex:1}
.table-head label.inline{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:6px}
.table-head label.inline input{width:76px;min-height:30px;padding:4px 8px}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:6px;background:var(--surface);margin-bottom:24px}
.grid{width:100%;border-collapse:collapse;font-size:12.5px}
.grid th,.grid td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.grid thead th{position:sticky;top:0;background:var(--surface-2);font-size:11.5px;color:var(--muted);font-weight:600;white-space:nowrap}
.grid tbody tr:last-child>*{border-bottom:0}
.grid tbody tr:hover{background:color-mix(in srgb,var(--surface-2) 55%,transparent)}
.grid td.num{font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap;font-family:var(--font-mono);font-size:12px}
.grid td.smi{font-family:var(--font-mono);font-size:11.5px;max-width:260px;overflow-wrap:anywhere}
.grid td.mol{width:96px;padding:2px 6px}
.grid td.mol svg{display:block;width:92px;height:64px}
.grid.static{font-size:13px}
.grid.static tbody th{white-space:nowrap;font-weight:600}
.grid.compact th,.grid.compact td{padding:6px 9px}
.tag{display:inline-block;font-size:11px;padding:1px 7px;border-radius:3px;background:var(--surface-2);color:var(--muted);white-space:nowrap;margin:1px 2px 1px 0}
.tag.ok{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}
.tag.warn{background:color-mix(in srgb,var(--warn) 15%,transparent);color:var(--warn)}
.tag.bad{background:color-mix(in srgb,var(--danger) 13%,transparent);color:var(--danger)}
.tag.gold{background:var(--gold-soft);color:var(--gold)}
.tag.demo{border:1px dashed var(--gold);background:transparent;color:var(--gold)}
.reasons{margin:0;padding-left:16px;color:var(--muted);font-size:12px}
.reasons li{margin:1px 0}
.settings{margin-bottom:18px}
.settings h3{font-size:14px}
.rules{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:0;margin:0 0 18px;list-style:none;counter-reset:r}
.rules li{counter-increment:r;border:1px solid var(--line);border-radius:6px;background:var(--surface);padding:12px 14px 12px 44px;position:relative;font-size:12.5px;color:var(--muted)}
.rules li::before{content:counter(r);position:absolute;left:14px;top:11px;font:400 20px/1 var(--font-num);color:var(--accent-2)}
.rules b{display:block;color:var(--ink);font-size:13px}
.code-box{border:1px solid var(--line);border-radius:6px;overflow:hidden;margin-top:12px}
.code-bar{display:flex;align-items:center;gap:10px;padding:6px 10px;background:var(--surface-2);font-size:12px;color:var(--muted)}
.code-bar span{margin-right:auto}
.code-box pre{margin:0;padding:12px 14px;max-height:360px;overflow:auto;background:var(--paper)}
.code-box code{background:none;padding:0;font-size:11.8px;line-height:1.6;white-space:pre}
.drop{display:grid;place-items:center;gap:2px;border:1.5px dashed var(--line-strong);border-radius:6px;padding:18px;margin-bottom:10px;cursor:pointer;background:var(--paper);text-align:center}
.drop b{font-size:13px}.drop span{font-size:12px;color:var(--muted)}
.drop.over{border-color:var(--accent-2);background:var(--accent-soft)}
.cols{font-size:12.5px;color:var(--muted);margin-top:12px}
.cols summary{cursor:pointer;color:var(--ink-2)}
.cols ul{padding-left:18px;margin:8px 0 0}
.msg{font-size:12.5px;min-height:18px;margin:10px 0 0}
.msg.ok{color:var(--ok)}.msg.err{color:var(--danger)}

/* chart */
.chart-card{margin-bottom:18px}
.chart-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.chart-head h3{margin:0;margin-right:auto}
.round-ctl{display:flex;align-items:center;gap:12px;font-size:12.5px;color:var(--muted)}
.round-ctl label{display:flex;align-items:center;gap:8px}
.round-ctl input[type=range]{width:180px;accent-color:var(--accent-2)}
.chart svg{display:block;width:100%;height:auto;max-height:520px;font-family:var(--font-sans)}
.chart .axis{stroke:var(--line-strong)}
.chart .gridline{stroke:var(--line);stroke-dasharray:2 4}
.chart .tick{fill:var(--muted);font-size:11px}
.chart .label{fill:var(--ink-2);font-size:12px;font-weight:600}
.chart .front{fill:none;stroke:var(--gold);stroke-width:2}
.chart .front-old{fill:none;stroke:var(--line-strong);stroke-width:1.4;stroke-dasharray:4 4}
.chart .pt{cursor:pointer;transition:opacity .2s}
.chart .pt:hover .dot{stroke-width:2.6}
.chart .err-box,.legend .err-box{fill:color-mix(in srgb,var(--gold) 9%,transparent);stroke:color-mix(in srgb,var(--gold) 35%,transparent);stroke-width:1}
.chart .better{fill:var(--faint);font-size:11px}
.chart .empty{fill:var(--muted);font-size:13px}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:12px;color:var(--muted);margin-top:8px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend svg{display:block}
.hv{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
.hv h4{margin:0 0 6px;font-size:12.5px;color:var(--muted);font-weight:600}
.hv svg{display:block;width:100%;height:auto;max-height:120px}
.budget{width:100%;border-collapse:collapse;font-size:12.5px}
.budget th,.budget td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:right}
.budget th:first-child,.budget td:first-child{text-align:left}
.budget input{width:72px;min-height:30px;padding:3px 6px;text-align:right}
.budget tfoot td{font-weight:700;border-bottom:0}
.picks{display:grid;gap:8px;margin-top:6px}
.pick{border:1px solid var(--line);border-radius:6px;padding:10px 12px;display:grid;grid-template-columns:auto 1fr auto;gap:4px 12px;align-items:center;background:var(--paper)}
.pick .rank{font:400 20px var(--font-num);color:var(--accent-2)}
.pick .smi{font-family:var(--font-mono);font-size:12px;overflow-wrap:anywhere}
.pick .reasons{grid-column:2/-1}
.pick .cost{font-size:12px;color:var(--muted);white-space:nowrap}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-bottom:30px}
.mcard{border:1px solid var(--line);border-radius:6px;background:var(--surface);display:flex;flex-direction:column;overflow:hidden}
.mcard.sel{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-soft)}
.mcard .art{background:var(--paper);border-bottom:1px solid var(--line);display:grid;place-items:center;height:150px;position:relative}
.mcard .art svg{width:100%;height:150px}
.mcard .badges{display:flex;gap:4px;flex-wrap:wrap}
.mcard .body{padding:12px 14px 14px;display:grid;gap:8px}
.mcard h4{margin:0;font-size:14px}
.mcard .smi{font-family:var(--font-mono);font-size:11.5px;color:var(--muted);overflow-wrap:anywhere}
.mcard .why{font-size:12.5px;margin:0;color:var(--ink-2)}
.mcard table{width:100%;border-collapse:collapse;font-size:12px}
.mcard td,.mcard th{padding:3px 4px;border-bottom:1px solid var(--line);text-align:right;font-variant-numeric:tabular-nums}
.mcard th{color:var(--muted);font-weight:500}
.mcard td:first-child,.mcard th:first-child{text-align:left}
.mcard .foot{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px}
.mcard .foot .text-button{padding:2px 0}
.empty-note{padding:30px;text-align:center;color:var(--muted);border:1px dashed var(--line-strong);border-radius:6px;grid-column:1/-1;background:var(--surface)}

/* method */
.method{padding:40px 0 20px;border-top:1px solid var(--line)}
.method h2{font-size:26px;margin:0 0 10px;letter-spacing:-.5px}
.method h3{font-size:15px;margin:0 0 8px}
.method-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin:6px 0 26px}
.method-grid p,.method-grid li{font-size:13.5px;line-height:1.85;color:var(--ink-2)}
.method-grid ul{padding-left:18px;margin:0}
.sources ul{padding-left:18px;font-size:13px;line-height:1.9;color:var(--ink-2)}
.lab-foot{display:flex;gap:30px;justify-content:space-between;padding:20px 0 40px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.lab-foot strong{color:var(--ink);font-size:14px;white-space:nowrap}
.lab-foot p{margin:0;max-width:640px}
.tip{position:fixed;z-index:90;pointer-events:none;background:var(--surface);border:1px solid var(--line-strong);border-radius:6px;padding:8px 10px;font-size:12px;line-height:1.55;box-shadow:var(--shadow);max-width:300px}
.tip .smi{font-family:var(--font-mono);font-size:11px;color:var(--muted);overflow-wrap:anywhere}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,12px);background:var(--accent);color:var(--accent-ink);padding:10px 18px;border-radius:4px;font-size:13px;opacity:0;pointer-events:none;transition:.2s;z-index:95;max-width:90vw}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media(max-width:1100px){main{padding:0 24px}.lab-hero{grid-template-columns:1fr;gap:30px;padding-top:40px}.split{grid-template-columns:1fr}.rules{grid-template-columns:1fr 1fr}.method-grid{grid-template-columns:1fr}}
@media(max-width:720px){
  main{padding:0 16px}
  .facts{grid-template-columns:1fr 1fr;gap:16px}.facts div{border:0;padding:0}
  .loop{padding:14px}.loop-grid{grid-template-columns:1fr;gap:10px}
  .loop-node::after,.loop-node::before{display:none}
  .loop-node:nth-child(4){order:6}.loop-node:nth-child(5){order:5}.loop-node:nth-child(6){order:4}
  .rules{grid-template-columns:1fr}
  .bench-head{align-items:flex-start}
  .card{padding:16px}
  .form-row{flex-wrap:wrap}
  .lab-foot{flex-direction:column;gap:8px}
  .round-ctl input[type=range]{width:120px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
@media print{.cr-header,.bench-actions,.steps,.actions,.tip,.toast{display:none!important}.tab{display:block!important}}
/* RDKit 结构图：黑色键与标签跟随正文颜色，深色模式下仍然清楚。 */
.molsvg path[style*="stroke:#000000"]{stroke:var(--ink)!important}
.molsvg path[style*="fill:#000000"],.molsvg text[style*="fill:#000000"]{fill:var(--ink)!important}
.molsvg rect[style*="fill:#FFFFFF"],.molsvg rect[style*="fill:#ffffff"]{fill:transparent!important}