/* Surveillance video understanding demo. System fonts, local assets only. */
:root{
  --bg:#f5f6f8; --panel:#ffffff; --ink:#1a1e24; --muted:#5b6470; --line:#d9dde3; --line2:#eceef2;
  --accent:#0b5aa6; --accent-soft:#e3eefa;
  --ref:#1f7a3d; --ref-soft:#dff2e5;         /* reference / ground truth */
  --pred:#0b5aa6; --pred-soft:#dbe9f8;       /* model prediction */
  --paper:#6b3fa0; --paper-soft:#eee6f7;     /* paper-reported */
  --pend:#8a5a00; --pend-soft:#fdf0d3;       /* pending / not run */
  --bad:#a4262c; --bad-soft:#fbe4e5;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 var(--sans)}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #f0a000;outline-offset:2px}
h1{font-size:26px;line-height:1.25;margin:0 0 8px}
h2{font-size:19px;margin:32px 0 10px;padding-top:4px}
h3{font-size:15.5px;margin:18px 0 6px}
p{margin:0 0 10px}
code,pre,.mono{font-family:var(--mono);font-size:12.5px}
pre{background:#f3f4f6;border:1px solid var(--line2);border-radius:6px;padding:10px 12px;overflow:auto;white-space:pre-wrap;word-break:break-word;margin:0 0 10px;max-height:420px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:50}

.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-in{max-width:1360px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.brand{font-weight:650;font-size:14.5px;padding:12px 0;white-space:nowrap}
.nav{display:flex;gap:2px;flex-wrap:wrap}
.nav a{display:block;padding:12px 12px;text-decoration:none;color:var(--ink);border-bottom:3px solid transparent;font-size:14.5px}
.nav a:hover{background:var(--line2)}
.nav a[aria-current="page"]{border-bottom-color:var(--accent);color:var(--accent);font-weight:600}
.prov{background:#fbfbfc;border-bottom:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.prov-in{max-width:1360px;margin:0 auto;padding:6px 20px;display:flex;gap:6px 18px;flex-wrap:wrap}
.prov b{color:var(--ink);font-weight:600}
main{max-width:1360px;margin:0 auto;padding:22px 20px 60px}
footer{max-width:1360px;margin:0 auto;padding:16px 20px 40px;color:var(--muted);font-size:12.5px;border-top:1px solid var(--line)}
.lede{font-size:16.5px;color:#2b3138;max-width:980px}
.note{color:var(--muted);font-size:13px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:16px}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.callout{border-left:4px solid var(--accent);background:var(--accent-soft);padding:10px 14px;border-radius:0 6px 6px 0;margin:12px 0}
.callout.warn{border-color:var(--pend);background:var(--pend-soft)}
.callout.paper{border-color:var(--paper);background:var(--paper-soft)}

.tag{display:inline-block;font-size:12px;line-height:1;padding:4px 7px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink);white-space:nowrap;vertical-align:baseline}
.tag.ref{background:var(--ref-soft);border-color:#b5dcc0;color:#14522a}
.tag.pred{background:var(--pred-soft);border-color:#b3cfee;color:#0a447d}
.tag.paper{background:var(--paper-soft);border-color:#d3c1ea;color:#4b2a77}
.tag.pend{background:var(--pend-soft);border-color:#ecd59a;color:#6b4500}
.tag.bad{background:var(--bad-soft);border-color:#efbcbf;color:#7d1c21}
.tag.ok{background:var(--ref-soft);border-color:#b5dcc0;color:#14522a}
.tag.norm{background:#eef0f3}
.tag.manual{background:#fff3e6;border-color:#f0cfa4;color:#7a4300}
.banner{display:flex;gap:10px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:6px;padding:9px 12px;margin:10px 0 16px;font-size:13.5px}

table{border-collapse:collapse;width:100%;font-size:13.5px;background:#fff}
th,td{border:1px solid var(--line);padding:6px 9px;text-align:left;vertical-align:top}
th{background:#f0f2f5;font-weight:600}
td.n,th.n{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
caption{caption-side:top;text-align:left;font-weight:600;padding:0 0 6px}
.tablewrap{overflow-x:auto;border-radius:6px;margin:0 0 12px}
.dash{color:var(--muted)}
.bar{display:block;height:6px;background:var(--line2);border-radius:3px;margin-top:3px;min-width:60px}
.bar>i{display:block;height:6px;border-radius:3px;background:var(--pred)}

button,select,input[type=search],input[type=text]{font:inherit;color:inherit}
.btn{border:1px solid #b9c0ca;background:#fff;border-radius:6px;padding:6px 12px;cursor:pointer}
.btn:hover{background:var(--line2)}
.btn[aria-pressed="true"],.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn:disabled{opacity:.5;cursor:not-allowed}
.seg{display:inline-flex;border:1px solid #b9c0ca;border-radius:6px;overflow:hidden;background:#fff}
.seg .btn{border:0;border-radius:0;border-right:1px solid #b9c0ca}.seg .btn:last-child{border-right:0}
select,input[type=search]{border:1px solid #b9c0ca;border-radius:6px;padding:6px 8px;background:#fff;max-width:100%}
label.f{display:flex;flex-direction:column;gap:3px;font-size:12.5px;color:var(--muted)}
.filters{display:flex;gap:10px 14px;flex-wrap:wrap;align-items:flex-end;margin:0 0 14px}
.check{display:inline-flex;gap:6px;align-items:center;font-size:14px}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;flex-direction:column}
.card button.thumb{border:0;padding:0;background:#111;cursor:pointer;display:block;width:100%;aspect-ratio:4/3;position:relative}
.card img{width:100%;height:100%;object-fit:contain;display:block;background:#111}
.card .dur{position:absolute;right:6px;bottom:6px;background:rgba(0,0,0,.75);color:#fff;font-size:12px;padding:1px 6px;border-radius:4px}
.card .meta{padding:9px 10px;display:flex;flex-direction:column;gap:6px;font-size:13px}
.card .id{font-family:var(--mono);font-size:12.5px}
.card .links{display:flex;gap:10px;font-size:13px}
.card.sel{outline:3px solid var(--accent)}
.chips{display:flex;gap:4px;flex-wrap:wrap}

.detail{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:16px;margin-bottom:22px}
video{width:100%;max-height:520px;background:#000;border-radius:6px;display:block}
.kv{display:grid;grid-template-columns:max-content 1fr;gap:3px 12px;font-size:13.5px;margin:0}
.kv dt{color:var(--muted)}.kv dd{margin:0;word-break:break-word}

.tl{margin:10px 0 4px}
.tl-row{display:grid;grid-template-columns:150px 1fr;gap:8px;align-items:center;margin:4px 0}
.tl-label{font-size:12.5px;color:var(--muted);line-height:1.2}
.tl-track{position:relative;height:24px;background:#eceff3;border-radius:4px;border:1px solid var(--line)}
.tl-span{position:absolute;top:2px;bottom:2px;min-width:4px;border-radius:3px;border:1px solid;cursor:pointer;padding:0;font-size:11px;overflow:hidden;white-space:nowrap;text-align:left;text-indent:4px;line-height:18px}
.tl-span.ref{background:var(--ref-soft);border-color:var(--ref);color:#14522a}
.tl-span.pred{background:var(--pred-soft);border-color:var(--pred);color:#0a447d;background-image:repeating-linear-gradient(135deg,transparent 0 6px,rgba(11,90,166,.13) 6px 8px)}
.tl-span.win{background:#fff3e6;border-color:#c77700;color:#7a4300}
.tl-span.bad{background:var(--bad-soft);border-color:var(--bad);color:#7d1c21}
.tl-head{position:absolute;top:-3px;bottom:-3px;width:2px;background:#d11;pointer-events:none}
.tl-mark{position:absolute;top:-4px;bottom:-4px;width:0;border-left:2px dashed #c77700;pointer-events:none}
.tl-axis{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-left:158px}

.sheet{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:4px}
.sheet button{border:1px solid var(--line);background:#111;padding:0;cursor:pointer;border-radius:3px;overflow:hidden;position:relative}
.sheet img{width:100%;display:block;aspect-ratio:4/3;object-fit:contain}
.sheet span{position:absolute;left:0;bottom:0;background:rgba(0,0,0,.72);color:#fff;font-size:10.5px;padding:0 3px}

.cols3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.col h3{margin-top:0}
.withheld{background:repeating-linear-gradient(135deg,#f3f4f6 0 8px,#e9ebef 8px 16px);border:1px dashed #9aa3af;border-radius:6px;padding:8px 10px;font-size:13px}
.list{max-height:520px;overflow:auto;border:1px solid var(--line);border-radius:6px;background:#fff}
.list button{display:block;width:100%;text-align:left;border:0;border-bottom:1px solid var(--line2);background:#fff;padding:7px 10px;cursor:pointer;font-size:13px}
.list button[aria-current="true"]{background:var(--accent-soft);font-weight:600}
.split{display:grid;grid-template-columns:280px minmax(0,1fr);gap:16px}

.diagram{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px;overflow-x:auto}
.diagram svg{display:block;min-width:760px;width:100%;height:auto}
.stages{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0;padding:0;list-style:none}
.stages li{flex:1 1 130px;border:1px solid var(--line);border-radius:6px;padding:7px 9px;background:#fff;font-size:13px;color:var(--muted)}
.stages li b{display:block;color:var(--ink);font-size:13.5px}
.stages li.on{border-color:var(--accent);background:var(--accent-soft);color:var(--ink)}
.stages li.done{border-color:#b5dcc0;background:#f3faf5}
.locked{border:1px dashed #9aa3af;border-radius:6px;padding:14px;color:var(--muted);background:#fafbfc}
.result{border:1px solid var(--pred);border-radius:6px;padding:12px;background:#f7fbff}
.hidden{display:none !important}
details{background:#fff;border:1px solid var(--line);border-radius:6px;padding:8px 12px;margin:8px 0}
summary{cursor:pointer;font-weight:600}

@media (max-width:900px){
  .g2,.g3,.cols3,.detail,.split{grid-template-columns:minmax(0,1fr)}
  .sheet{grid-template-columns:repeat(4,minmax(0,1fr))}
  .tl-row{grid-template-columns:minmax(0,1fr)}.tl-axis{margin-left:0}
  main{padding:16px 12px 50px}.topbar-in,.prov-in{padding-left:12px;padding-right:12px}
  .nav a{padding:8px 9px}.topbar{position:static}.brand{padding:10px 0 0}
  h1{font-size:22px}
}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}

/* ---- charts ---- */
.chartcard{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px;overflow-x:auto}
.chartcard h3{margin:0 0 2px;font-size:15px}
.chartcard .sub{color:var(--muted);font-size:12.5px;margin:0 0 8px}
svg.chart{display:block;flex:none;max-width:none}
svg.chart .mark{cursor:default}
svg.chart g.mark:hover path,svg.chart g.mark:hover rect[rx],svg.chart rect.mark:hover,svg.chart g.mark:focus path,svg.chart rect.mark:focus{filter:brightness(1.13)}
svg.chart a rect.mark{cursor:pointer}
svg.chart a:focus rect.mark,svg.chart rect.mark:hover{stroke:#1a1e24;stroke-width:1.5}
svg.chart [tabindex]:focus{outline:none}
svg.chart g[tabindex]:focus-visible rect[fill="transparent"]{stroke:#f0a000;stroke-width:2}
.legend{display:flex;gap:6px 16px;flex-wrap:wrap;font-size:12.5px;color:var(--ink);margin:0 0 8px}
.legend .lg{display:inline-flex;align-items:center;gap:6px}
.legend .sw{display:inline-block;width:12px;height:12px;border-radius:3px}
.legend .sw.hatch{background:repeating-linear-gradient(45deg,#898781 0 1.5px,#eceef1 1.5px 4px) !important}
.legend .ramp{display:inline-block;width:90px;height:10px;border-radius:3px;background:linear-gradient(90deg,#cde2fb,#3987e5,#0d366b)}
.legend .ramp.paper{background:linear-gradient(90deg,#fbe3d6,#eb6834,#7d3009)}
#tip{position:fixed;z-index:60;pointer-events:none;background:#1a1e24;color:#fff;border-radius:6px;padding:6px 9px;font-size:12px;line-height:1.35;max-width:280px;box-shadow:0 4px 14px rgba(0,0,0,.25)}
#tip b{display:block;font-size:13.5px}
#tip span{color:#c9ccd2}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:14px 0 6px}
.tile{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 14px}
.tile .v{font-size:30px;font-weight:650;line-height:1.1}
.tile .l{font-size:12.5px;color:var(--muted);margin-top:4px}
.icons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.icard{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px;text-align:center}
.icard svg{width:100%;max-width:230px;height:auto;display:block;margin:0 auto 6px}
.icard b{display:block;font-size:14.5px}.icard span{font-size:12.5px;color:var(--muted)}
details.more>summary{font-weight:500;color:var(--accent)}
.chips-row{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0}
@media (max-width:900px){.icons{grid-template-columns:minmax(0,1fr)}}

@media (max-width:900px){main .grid[style]{grid-template-columns:minmax(0,1fr) !important}}
.chips-row .tag{white-space:normal;word-break:break-word}.callout{min-width:0;overflow-wrap:anywhere}