:root{
  color-scheme:light;
  --ink:#1d3557;
  --paper:#f1faee;
  --secondary:#457b9d;
  --cyan:#a8dadc;
  --accent:#e63946;
  --blue:var(--ink);
  --muted:rgba(29,53,87,.78);
  --line:rgba(29,53,87,.18);
  --strong-line:rgba(29,53,87,.42);
  --surface:rgba(255,255,255,.68);
  --tint:rgba(168,218,220,.20);
  --display:Canela,"Iowan Old Style",Baskerville,"Songti SC",Georgia,serif;
}
*{box-sizing:border-box}
html{scroll-padding-top:16px}
body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:var(--ink);text-decoration:none;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration:underline}
button,input,select{font:inherit}
button,select{cursor:pointer}
:is(button,a,input,select,summary):focus-visible{outline:2px solid var(--secondary);outline-offset:3px}
button:disabled{opacity:.45;cursor:default}
header{border-bottom:1px solid var(--strong-line);background:var(--paper)}
nav,main,footer{max-width:1240px;margin:auto;padding:18px 28px}
nav{display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{font:20px/1.35 var(--display);color:var(--ink)}
.languages{display:flex;gap:3px;padding:3px;border:1px solid var(--line);border-radius:4px}
.languages :is(button,a){display:inline-flex;align-items:center;justify-content:center;min-height:34px;border:0;padding:5px 12px;border-radius:2px;background:transparent;color:var(--muted);font-size:13px;text-decoration:none}
.languages :is(button,a)[aria-pressed=true],.languages a[aria-current=page]{background:var(--ink);color:var(--paper)}
.hero{padding:24px 0 18px}
.eyebrow{display:flex;align-items:center;gap:9px;font:11px/1.4 ui-monospace,monospace;letter-spacing:.12em;color:var(--muted)}
.eyebrow:before{content:"";display:inline-block;width:16px;height:2px;background:var(--accent)}
h1{font:42px/1.08 var(--display);font-weight:500;margin:12px 0;letter-spacing:-.025em}
html[lang=zh-CN] h1{font-family:var(--display);font-size:36px;font-weight:600;letter-spacing:.015em}
.intro{max-width:940px;margin:10px 0;font-size:15px;line-height:1.65;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);margin:20px 0 14px;border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}
.stats>div{padding:11px 16px;border-right:1px solid var(--line)}
.stats>div:first-child{padding-left:0}
.stats>div:last-child{border-right:0}
.stats strong{display:block;font:31px/1.25 var(--display);font-variant-numeric:lining-nums tabular-nums;letter-spacing:-.025em}
.stats span{font-size:13px;color:var(--muted)}
.note{max-width:980px;font-size:13px;line-height:1.6;color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.library-links{display:flex;gap:8px 20px;align-items:center;flex-wrap:wrap;font-size:13px;margin:12px 0 0}
.library-links a{display:inline-flex;align-items:center;min-height:32px}
.scope-note{font-size:13px;color:var(--muted);margin:0}
.source-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0 30px}
.source-card{border:1px solid var(--line);border-radius:4px;background:var(--surface);padding:16px 18px}
.source-card h3{font-size:16px;margin:0 0 5px}
.source-card p{margin:5px 0;color:var(--muted);font-size:13px}
.source-card .links{display:flex;flex-wrap:wrap;gap:12px;font-size:13px;margin-top:10px}
.chip{display:inline-block;font:12px/1.5 ui-monospace,monospace;background:var(--tint);color:var(--ink);border:1px solid rgba(69,123,157,.16);border-radius:3px;padding:2px 6px}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:end;padding:14px 0;border-top:1px solid var(--strong-line)}
input,select,.outline{border:1px solid var(--strong-line);border-radius:4px;background:var(--surface);color:var(--ink);padding:9px 12px}
input::placeholder{color:var(--muted);opacity:1}
.toolbar input{flex:1;min-width:220px}
.toolbar select{max-width:240px}
.toolbar :is(input,select,button){min-height:44px;font-size:14px}
.counts{display:flex;justify-content:space-between;align-items:center;gap:6px 16px;margin:10px 0 16px;color:var(--muted);font-size:13px}
.results-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:14px 0}
.results-actions .counts{flex-wrap:wrap;margin:0}
.result-tools{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:8px 12px;min-width:0}
.result-tools .downloads,.result-tools .record-export-status{margin:0}
.result-tools .downloads button{min-height:42px;padding:8px 14px;font-size:13px}
.active-scope{display:flex;align-items:center;justify-content:space-between;gap:10px 14px;flex-wrap:wrap;background:var(--tint);border:1px solid var(--line);border-left:3px solid var(--secondary);border-radius:3px;padding:10px 14px;color:var(--ink);font-size:13px;margin:8px 0}
.active-scope[hidden]{display:none}
.active-scope a{font-weight:600;white-space:nowrap}
.task-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:start}
.task-card{background:var(--surface);border:1px solid var(--line);border-top-color:var(--strong-line);border-radius:4px;padding:17px;min-width:0}
.task-meta{display:flex;gap:5px 7px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.task-card h3{font:13px/1.6 ui-monospace,monospace;font-weight:500;color:var(--muted);margin:12px 0 7px;overflow-wrap:anywhere}
.instruction{font-size:15px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 16px}
.task-links{display:flex;align-items:center;flex-wrap:wrap;gap:6px 14px;font-size:13px}
.task-links a{display:inline-flex;align-items:center;min-height:32px;text-decoration:underline;text-decoration-color:rgba(69,123,157,.35)}
.task-links a:hover{text-decoration-color:var(--ink)}
.task-links button{min-height:36px;padding:5px 10px;font-size:13px}
.task-card details{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}
summary{cursor:pointer;color:var(--muted);font-size:13px;line-height:1.6}
summary::marker{color:var(--secondary)}
.task-card details>summary{min-height:28px}
pre{font:12px/1.6 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;max-height:360px;overflow:auto;padding:14px;background:var(--tint);border-radius:3px}
.status{color:var(--muted);font-size:13px;margin-top:8px;line-height:1.6}
.pager{display:flex;align-items:center;justify-content:center;gap:14px;padding:24px 0;font-size:13px;flex-wrap:wrap}
.pager button{min-height:42px}
.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:60px 10px}
footer{color:var(--muted);font-size:12px;border-top:1px solid var(--strong-line)}
.downloads{display:flex;gap:8px 18px;align-items:center;flex-wrap:wrap;margin-top:12px}
.downloads button{background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:4px;padding:9px 16px}
.downloads button:hover:not(:disabled),.source-primary:hover{border-color:var(--secondary);box-shadow:inset 0 0 0 1px var(--secondary);color:var(--paper);text-decoration:none}
.audit{margin:20px 0}
.audit p{font-size:13px;color:var(--muted)}
.library-context{display:grid;grid-template-columns:1fr 1fr;align-items:start;gap:12px;margin:8px 0 24px}
.library-context>details{min-width:0;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:4px}
.library-context>details:has(table){grid-column:1/-1}
.source-directory>summary,.collection-notes>summary,.source-methodology>summary{padding:12px 16px;min-height:46px;font-size:14px;color:var(--ink);font-weight:550}
.source-directory[open]>summary,.collection-notes[open]>summary,.source-methodology[open]>summary{border-bottom:1px solid var(--line)}
.table-scroll{width:100%;max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;border-radius:3px}
.table-scroll:focus-visible{outline:2px solid var(--secondary);outline-offset:3px}
.source-table,.method-table,.source-facts-table table{width:100%;border-collapse:collapse;text-align:left;font-size:13px;background:var(--surface)}
.source-table{min-width:680px}
.source-table :is(th,td),.method-table :is(th,td),.source-facts-table :is(th,td){padding:11px 14px;vertical-align:top;border-bottom:1px solid var(--line)}
.source-table thead th,.source-facts-table th{font-size:12px;font-weight:600;color:var(--ink);background:var(--tint);white-space:nowrap}
.source-table td{line-height:1.65}
.source-table tbody th[scope=row]{font-size:13px;font-weight:550;min-width:155px;background:inherit;color:var(--ink)}
.source-table td:last-child{min-width:195px}
.source-table tr:last-child :is(th,td),.method-table tr:last-child :is(th,td),.source-facts-table tr:last-child td{border-bottom:0}
.source-table tbody tr:hover{background:var(--tint)}
.source-table tbody tr:hover th[scope=row]{box-shadow:inset 2px 0 var(--secondary)}
.source-table a{display:inline-block;min-height:30px;padding:3px 0}
.source-table strong{font-variant-numeric:tabular-nums}
.table-secondary{display:block;color:var(--muted);font-size:12px;line-height:1.6;font-weight:400}
.method-table th{font-weight:550;width:180px;color:var(--ink)}
.method-table td{line-height:1.7;color:var(--muted);overflow-wrap:anywhere}
.collection-notes>p{padding:0 16px;margin:12px 0;font-size:13px}

/* Source pages keep all evidence in readable, script-free disclosures. */
.languages a{text-decoration:none}
.source-breadcrumb{font-size:13px;color:var(--muted);margin:7px 0 12px}
.source-hero{padding:8px 0 18px}
.source-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.source-heading h1{margin:10px 0}
.source-jump{font-size:13px;min-height:36px;display:inline-flex;align-items:center}
.source-facts-table{border:1px solid var(--line);margin:12px 0}
.source-facts-table table{table-layout:fixed}
.source-facts-table :is(th,td){overflow-wrap:anywhere;white-space:normal;padding:9px 12px}
.source-facts-table td code{font-size:12px}
.source-evidence-status{font-size:13px;color:var(--muted);margin:10px 0}
.source-evidence-status b{color:var(--ink);margin-right:8px;font-weight:550}
.source-hero .downloads{font-size:13px}
.source-hero .downloads a{display:inline-flex;align-items:center;min-height:38px}
.source-primary{display:inline-block;border:1px solid var(--ink);border-radius:4px;padding:8px 14px;background:var(--ink);color:var(--paper)}
.source-methodology{border:1px solid var(--line);border-radius:4px;background:var(--surface);margin:0 0 20px}
.source-methodology>.source-facts,.source-methodology>.source-pin,.source-methodology>.note{margin-left:16px;margin-right:16px}
.source-facts{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.source-facts h2{font-size:16px;font-weight:550;margin:16px 0 8px}
.source-facts p{font-size:14px;line-height:1.7;margin:8px 0}
.source-pin{font-size:13px;line-height:1.7;overflow-wrap:anywhere}
.source-level-section{margin:24px 0}
.source-level-section h2,.source-categories h2,.source-task-index h2{font-size:19px;font-weight:550;margin:0 0 10px;letter-spacing:-.01em}
.source-levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}
.source-level-card{--accent-line:var(--ink);display:flex;flex-direction:column;gap:10px;padding:14px 16px;border:1px solid var(--line);border-top:2px solid var(--accent-line);border-radius:3px;background:var(--surface);text-decoration:none;color:var(--ink)}
.source-level-card:nth-child(2){--accent-line:var(--secondary)}
.source-level-card:nth-child(3){--accent-line:var(--cyan)}
.source-level-card>span:first-child{font-size:14px;font-weight:550}
.source-level-card strong{font:31px/1.1 var(--display);font-variant-numeric:lining-nums tabular-nums}
.source-level-card p{margin:0;font-size:13px;line-height:1.65;color:var(--muted)}
.source-level-card span:last-child{font-size:13px;color:var(--ink)}
.source-level-card:focus-visible{outline:2px solid var(--secondary);outline-offset:3px}
.source-categories{margin:22px 0}
.source-category-list{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}
.source-category-list .chip b{font-variant-numeric:tabular-nums;margin-left:3px}
.source-task-index{margin-top:24px;scroll-margin-top:18px}
.source-task-index>.note{max-width:80ch}
.section-count{display:inline-block;font:13px ui-monospace,monospace;font-variant-numeric:tabular-nums;color:var(--muted);margin-left:7px}
.source-task{border:1px solid var(--line);background:var(--surface);border-radius:3px;margin:6px 0}
.source-task>summary{display:grid;grid-template-columns:14px minmax(160px,.7fr) minmax(0,2fr);gap:10px;padding:12px 14px;align-items:baseline;color:var(--ink);font-size:14px;line-height:1.65;list-style:none}
.source-task>summary::-webkit-details-marker{display:none}
.source-task>summary:before{content:'+';color:var(--secondary);font-size:18px}
.source-task[open]>summary:before{content:'−'}
.source-task>summary>span{min-width:0;overflow-wrap:anywhere}
.source-task-id{font:12px/1.65 ui-monospace,monospace;overflow-wrap:anywhere;color:var(--muted)}
.source-task-body{padding:16px 20px;border-top:1px solid var(--line)}
.source-task-body>.instruction{max-width:100ch}
.source-task-body .task-links{gap:6px 20px}
.source-task[open]{border-color:var(--strong-line)}
.source-task:target{border-color:var(--ink);scroll-margin-top:20px}
.reading-nav{justify-content:flex-start;padding:24px 0 0;flex-wrap:wrap;font-size:13px}
.phase-details{margin:16px 0}
.phase-details>summary{color:var(--ink);font-size:13px;font-weight:600}
.phase-goals h3{margin:0 0 8px;font-size:16px}
.phase-list{list-style:none;padding:0;margin:12px 0}
.phase-list li{border-left:2px solid var(--secondary);padding:12px 15px;margin:0 0 10px;background:var(--tint);border-radius:0 3px 3px 0;overflow-wrap:anywhere}
.phase-list li:first-child{border-left-color:var(--ink)}
.phase-heading{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px}
.phase-list .instruction{margin:10px 0 0}
.source-review{margin:16px 0;padding:14px 16px;background:rgba(230,57,70,.035);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:0 3px 3px 0;font-size:14px}
.source-review :is(h2,h3){font-size:16px;margin:0 0 8px}
.source-review p{margin:8px 0;line-height:1.7}
.source-review>summary{font-size:14px;color:var(--ink);font-weight:600;min-height:28px}
.source-review li{overflow-wrap:anywhere;font-size:13px;margin:5px 0}
.review-label{font-weight:600;color:var(--ink);border-left:2px solid var(--accent);padding-left:8px}
.evaluation-materials{margin:16px 0;padding:12px 15px;border-left:2px solid var(--cyan);background:var(--tint);border-radius:0 3px 3px 0}
.evaluation-materials :is(h3,h4){font-size:15px;margin:0 0 8px}
.evaluation-materials>summary{font-size:13px;font-weight:550;color:var(--ink)}
.evaluation-materials .note{margin:8px 0}
.evaluation-materials details{margin:8px 0}
.evaluation-materials pre{max-height:300px;background:var(--surface)}
.evaluation-materials pre:focus{outline:2px solid var(--secondary)}
.task-card .evaluation-materials{border-top:0;padding:10px 13px;border-left:2px solid var(--cyan)}
.task-card .long-instruction{border:0;padding:0;margin:0 0 16px}
.long-instruction>summary{list-style:none;color:var(--ink);font-size:15px;line-height:1.6}
.long-instruction>summary::-webkit-details-marker{display:none}
.instruction-preview{display:block;white-space:pre-wrap;overflow-wrap:anywhere}
.expand-label{display:block;color:var(--ink);font-size:13px;margin:8px 0}
.long-instruction[open] .instruction-preview{display:none}
.long-instruction[open] .expand-label{margin-top:0}
.long-instruction .when-open,.long-instruction[open] .when-closed{display:none}
.long-instruction[open] .when-open{display:inline}
.load-message{font-size:13px;color:var(--ink);padding:12px 14px;background:rgba(230,57,70,.035);border-left:3px solid var(--accent);border-radius:0 3px 3px 0}
.record-export-status{font-size:13px;color:var(--muted);overflow-wrap:anywhere}
.record-export-status:empty{display:none}
.task-card [aria-busy=true]>summary{color:var(--ink)}

@media(min-width:761px){
  .source-table :is(th,td){padding-top:7px;padding-bottom:7px;vertical-align:middle}
  .source-table tbody td:is(:nth-child(2),:last-child) .table-secondary{display:inline-block;vertical-align:baseline;margin-left:10px}
  .source-table tbody td:last-child{white-space:nowrap}
}
@media(max-width:760px){
  nav,main,footer{padding-left:18px;padding-right:18px}
  nav{align-items:flex-start}
  .brand{font-size:17px}
  .languages :is(button,a){padding:4px 8px;min-height:36px;font-size:13px}
  .hero{padding-top:18px}
  h1{font-size:35px}
  html[lang=zh-CN] h1{font-size:31px}
  .stats{grid-template-columns:1fr 1fr}
  .stats>div{padding:10px 12px 10px 0;border-right:0}
  .stats strong{font-size:29px}
  .source-grid{grid-template-columns:1fr 1fr}
  .source-card{padding:13px}
  .toolbar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch}
  .toolbar>input{grid-column:1/-1;width:100%;min-width:0}
  .toolbar>select{width:100%;min-width:0;max-width:none}
  .toolbar>select:last-child:nth-of-type(odd){grid-column:1/-1}
  .toolbar :is(input,select,button){font-size:16px;min-height:44px}
  .counts{align-items:flex-start}
  .results-actions{align-items:flex-start}
  .result-tools{justify-content:flex-start}
  .task-list{grid-template-columns:1fr}
  .task-card{padding:16px}
  .library-context{grid-template-columns:1fr}
  .source-heading{gap:0 12px}
  .source-facts{grid-template-columns:1fr;gap:8px}
  .source-facts-table :is(th,td){padding:8px}
  .source-task>summary{grid-template-columns:14px minmax(0,1fr);gap:5px 9px}
  .source-task>summary>span:last-child{grid-column:2}
  .source-task-body{padding:14px}
  .source-primary{font-size:13px}
  .source-hero h1{font-size:32px}
  .method-table th{width:110px}
  .method-table :is(th,td){padding:10px 12px}
}
@media(max-width:600px){
  .source-levels{grid-template-columns:1fr}
  .source-level-card{display:grid;grid-template-columns:1fr auto;align-items:center}
  .source-level-card span:last-child{grid-column:1/-1}
}
@media(max-width:420px){
  nav{flex-wrap:wrap}
  .languages{margin-left:auto}
  .source-grid{grid-template-columns:1fr}
  .source-facts-table table{min-width:420px}
  .source-hero .downloads{gap:6px 14px}
  .source-level-card{padding:13px 14px}
  .source-task>summary{padding:11px 12px}
}
@media(prefers-reduced-motion:no-preference){
  .source-task,.task-card{transition:border-color .15s ease,background .15s ease}
  .source-task:hover,.task-card:hover{border-color:var(--strong-line)}
}