:root{--bg:#f4f6fa;--ink:#152b43;--muted:#6a7b8d;--line:#dde4ed;--accent:#2260ca;--soft:#eaf1ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;font-size:14px;line-height:1.65}header{min-height:78px;background:#fff;border-bottom:1px solid var(--line);padding:18px max(28px,calc((100vw - 1190px)/2));display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:27px;font-weight:800;letter-spacing:2px}.brand span{display:block;font-size:11px;color:var(--muted);font-weight:500;letter-spacing:1px}#version{font-size:12px;color:var(--muted)}#identity{display:flex;align-items:center;gap:9px}main{max-width:1190px;margin:34px auto;padding:0 18px}h1{font-size:32px;line-height:1.25;margin:12px 0}h2{font-size:19px;margin:0 0 14px}h3{font-size:15px;margin:12px 0}.eyebrow{color:var(--accent);font-size:11px;letter-spacing:2px;font-weight:750}.muted{color:var(--muted);margin:8px 0 20px}.card{padding:26px;background:white;border:1px solid var(--line);border-radius:13px;margin-bottom:22px}.login{max-width:475px;margin:60px auto}.grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.grid .card{margin-bottom:0}.heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:20px}.links{display:flex;gap:10px}.statusbar{display:flex;align-items:center;gap:10px;padding:13px 18px;background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:23px}.badge{margin-left:auto;background:var(--soft);color:#355b91;border-radius:5px;padding:3px 9px;font-size:12px}.dot{width:9px;height:9px;border-radius:50%;background:#b18435;flex:none}.dot.ready{background:#259479}label{display:block;font-weight:600;margin:15px 0}input:not([type=checkbox]),select,textarea{width:100%;font:inherit;border:1px solid #cbd6e4;border-radius:6px;padding:11px 12px;background:#fff;color:var(--ink);margin-top:7px}input:focus,textarea:focus,select:focus{outline:2px solid #abc7f4;outline-offset:1px}button,.button{display:inline-block;cursor:pointer;border:0;border-radius:6px;background:var(--accent);color:white;padding:11px 16px;font:inherit;font-weight:650;text-decoration:none}button:disabled{opacity:.5;cursor:wait}.minor,.secondary{background:#eff3f8;color:#385069;border:1px solid var(--line);padding:8px 12px}.minor{font-size:12px}.dropzone{background:#f8faff;border:1px dashed #bacbe3;border-radius:9px;padding:19px 15px;text-align:center}.dropzone input{background:white;font-weight:400}.dropzone span{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:8px}.note{font-size:12px;color:var(--muted);margin:18px 0 0}.warning{font-size:12px;color:#805a20;background:#fff6e5;padding:12px;border-radius:6px}.border-top{border-top:1px solid var(--line);padding-top:14px}.task{display:flex;gap:10px;align-items:center;border-bottom:1px solid #edf1f6;padding:6px 0}.task code{font-size:11px;background:var(--soft);padding:1px 5px}.task span:last-child{margin-left:auto;color:var(--muted)}.history{margin-top:22px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px}.row h2{margin:0}.check{font-size:12px;font-weight:400;margin:0}.tablewrap{overflow-x:auto}table{border-collapse:collapse;width:100%;margin-top:20px;text-align:left}th{font-size:12px;color:#7e8c9e;font-weight:600;background:#f7f9fc}th,td{padding:12px 11px;border-bottom:1px solid var(--line);vertical-align:top}td small{color:var(--muted);display:block}td strong{font-size:20px}td.actions{min-width:145px}td button{margin:2px}.good{color:#198063}.bad{color:#b14436}.pending{color:#b6802b}.hidden{display:none!important}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.6 Consolas,monospace;background:#f5f7fb;border:1px solid var(--line);border-radius:6px;padding:13px;max-height:380px;overflow:auto}details{border:1px solid var(--line);border-radius:6px;margin-top:12px;padding:12px}summary{cursor:pointer;font-weight:600}.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px}.compare h4{margin-bottom:4px}.compare pre{margin-top:0}.users{max-height:330px;overflow:auto}.userrow{display:flex;align-items:center;gap:7px;padding:8px 0;border-bottom:1px solid var(--line);font-size:12px}.userrow span{flex:1}.toast{position:fixed;z-index:10;top:12px;left:50%;transform:translateX(-50%);background:#193958;color:white;padding:13px 20px;border-radius:8px;max-width:90%;box-shadow:0 3px 15px #0002}footer{text-align:center;color:var(--muted);font-size:11px;padding:20px}#reportLink{margin:5px 0 10px}#newAccounts{background:#fff8e8}@media(max-width:800px){.grid,.compare{grid-template-columns:1fr}.heading{align-items:flex-start;flex-direction:column}header{padding:15px}.brand span{max-width:140px}#version{display:none}h1{font-size:27px}.card{padding:20px}.row{flex-wrap:wrap}.links{flex-wrap:wrap}.login{margin:30px auto}main{padding:0 12px}}
/* 0.4.0 learning review, offline-only UI. */
.filters{display:flex;gap:12px;align-items:end;flex-wrap:wrap;padding:12px 0}.filters label{margin:0;flex:1;min-width:130px;font-size:12px}.filters label.check{min-width:170px;flex:0 0 auto;margin-bottom:10px}.filters input,.filters select{padding:7px;font-size:12px}.pager{margin-top:12px}.pager .muted{margin:0}.learningCell{font-size:12px;min-width:170px}.sourceView{white-space:pre;overflow:auto;max-height:480px}.hash{word-break:break-all}.evidenceBox{background:#f4f7fc;padding:16px;border:1px solid var(--line);border-radius:8px}.reviewEvent{padding:10px 14px;border-left:3px solid #bccde5;margin:10px 0;background:#f7f9fc}.reviewEvent small{display:block;color:var(--muted)}.reviewEvent p{white-space:pre-wrap}#learningPanel,#historyPanel,#sourcePanel{margin:20px 0 26px;border-bottom:1px solid var(--line);padding-bottom:22px}#saveReview,#saveExplanation{margin-top:10px}.diffControls{display:grid;grid-template-columns:1fr 2fr;gap:16px}.diffView{white-space:pre;overflow:auto;background:#fff;max-height:500px}.diffView span{display:block;margin:0;white-space:pre;min-height:1em;line-height:1.6}.diffAdd{background:#e9f6ed;color:#175b37}.diffDel{background:#fdeced;color:#8a2933}.diffHunk{background:#eff3fa;color:#465779}.diffHeader{color:#58677b}.task button{margin-left:auto;white-space:nowrap}.task span:last-of-type{margin-left:auto;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:14px;width:min(850px,94vw);max-height:92vh;overflow:auto;color:var(--ink);padding:25px}dialog::backdrop{background:#10223888}.dialogButtons{justify-content:start;margin-top:18px}#taskStatement{max-height:40vh}#promptText{font-family:Consolas,monospace;font-size:12px;line-height:1.6}#traceSettings{margin:18px 0}#traceSettings button{margin-top:15px}#sourcesLink{margin:5px 0 10px 8px}#detailCard>h3{margin-top:25px}#learningPanel textarea{background:#fff}#historyPanel pre:empty{display:none}@media(max-width:800px){.diffControls{grid-template-columns:1fr}.filters{gap:8px}.task{flex-wrap:wrap}.filters label{min-width:100px}#sourcesLink{margin-left:0}}

/* Session controls are intentionally distinct from global account actions. */
#identity{flex-wrap:wrap;gap:8px;justify-content:flex-end}#identity a.minor{font-size:12px;padding:6px 8px}#logoutAll{color:#8d3340}#userName{font-weight:600}header{flex-wrap:wrap;gap:12px}

/* 0.4.2: private beginner reference answers, no external assets. */
.answerPanel{margin:22px 0;padding:20px;border:1px solid #c9d8ed;border-radius:12px;background:#f8fbff}
.answerPanel h3{margin-top:0}.answerPanel>p{line-height:1.7}
.answerItem{background:#fff;margin-top:14px;padding:14px;border:1px solid #dce5f1;border-radius:9px}
.answerItem summary{font-weight:650;cursor:pointer;line-height:1.6}
.answerItem li{margin:6px 0;line-height:1.7}.answerToolbar{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.answerCompare{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}
.answerColumn{min-width:0}.answerCode{margin:0;max-height:640px;overflow:auto;white-space:pre;tab-size:4;line-height:1.7;font-size:13px;background:#f3f6fa;border:1px solid #e0e6f0;color:#16263d}
.answerCode code{font-family:Consolas,'Courier New',monospace;background:transparent;color:inherit;padding:0}
.answerExplanation{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}
#answerSettings{margin:16px 0;padding:16px;border:1px solid #dce5f1;border-radius:9px}
#answerSettings summary{font-weight:650;cursor:pointer}
@media(max-width:850px){.answerCompare{grid-template-columns:1fr}.answerPanel{padding:12px}.answerCode{max-height:520px}}

/* 0.4.3 result policy and deterministic learning feedback. */
.scoringPolicy small{display:block;color:var(--muted);margin-top:10px;overflow-wrap:anywhere}
.errorInsights{margin-top:22px}.errorInsights>details{margin:0;border:0;padding:0}
.errorInsights>details>summary{font-size:19px}.errorKpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:14px 0}
.errorKpis>div{border:1px solid var(--line);border-radius:9px;background:#f8fbff;padding:14px}
.errorKpis span,.errorKpis strong{display:block}.errorKpis span{font-size:12px;color:var(--muted)}.errorKpis strong{font-size:27px;margin-top:6px}
.errorInsights td strong{font-size:14px}.errorInsights td:first-child{min-width:260px}.errorInsights td:last-child{min-width:145px}
.errorInsights td button{display:block;margin-bottom:5px}.errorInsights td small{max-width:420px}
.submissionErrors{margin:22px 0;border-top:1px solid var(--line);padding-top:14px}
.errorTip{padding:10px 14px;margin-top:10px;background:#f7f9fd;border-left:3px solid #dfab50}
.errorTip small{display:block;color:var(--muted);font-size:11px}.errorTip p{margin:6px 0}.errorTask{background:#fff}
.rubricNote{font-size:13px;line-height:1.9;background:#f0f4fa;padding:10px;border-radius:6px}
.whitespaceView pre{white-space:pre-wrap}.whitespaceView summary{font-size:12px;font-weight:500}
@media(max-width:680px){.errorKpis{grid-template-columns:repeat(2,minmax(0,1fr))}.errorInsights td:first-child{min-width:220px}}

/* 0.4.4: execution evidence precedes reference code and learning panels. */
.runOutputs{margin:20px 0 26px;padding:18px;border:2px solid #bed3f2;border-radius:10px;background:#fafdff}
#runOutputsTitle{font-size:18px;margin:0 0 8px}.runOutputs>.note{margin:4px 0 14px}
.outputToolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:10px 0}
.outputToolbar .check{margin-right:auto}.outputCounts{margin:6px 0 14px}
.outputTask{padding:14px;background:#fff;margin-top:15px}.outputTask>summary{font-size:15px}
.outputCase{background:#fff;padding:14px}.caseHeading{line-height:1.7}.caseHeading .caseBadge{display:inline-block;margin-left:12px}
.caseBadge{font-size:12px;border:1px solid currentColor;padding:0 6px;border-radius:4px}
.caseInput h4{margin:12px 0 5px}.caseInput pre{margin:0 0 12px;max-height:160px}
.caseControls{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;margin:10px 0}.caseControls .muted{margin:0;font-size:11px}
.outputCompare{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}
.outputColumn{min-width:0}.outputColumn h4{font-size:13px;margin:4px 0 6px}
.outputText{white-space:pre;overflow:auto;overflow-wrap:normal;tab-size:4;min-height:54px;max-height:420px;margin:0;font-size:13px;line-height:1.7}
.outputText.emptyOutput{color:#66778a;white-space:pre-wrap}.outputCompare .outputColumn:last-child .outputText{background:#f5f8ff}
.outputCase .rubricNote{margin-top:14px}.outputCase .rubricNote>strong{display:block;margin-bottom:4px}
.outputTask>.compileLog{max-height:400px}.outputCase .note{margin-top:12px}
@media(max-width:800px){.runOutputs{padding:12px}.outputCompare{grid-template-columns:1fr}.outputTask,.outputCase{padding:10px}.caseHeading .caseBadge{margin-left:0;margin-top:5px;display:table}.outputToolbar{gap:8px}}

/* Offline exams: ordinary forms stay available without online editor assets. */
.examCenter{margin-bottom:24px;border-top:4px solid #193f74}.examCenter h2{margin:6px 0}.examCard{padding:18px 0;border-top:1px solid #d9e2ee}.examCard h3{margin:0}.examTimeline,.examTimeInputs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:16px 0}.examTimeline>div{background:#f2f6fb;padding:12px;border-radius:8px}.examTimeline small,.examTimeline strong{display:block}.examTimeline strong{font-size:14px;margin-top:6px}.examInstructions{white-space:pre-wrap}.examUpload{max-width:700px;background:#f8fafe;padding:16px;border:1px solid #ccd7e8;border-radius:10px;margin-top:16px}.examReceipt{padding:16px;background:#f0f9f4;border:1px solid #b6d8c3;border-radius:10px;margin-top:16px}.receiptFields p{margin:6px 0;overflow-wrap:anywhere;font-size:13px}.examPaperReplace{font-size:12px;max-width:300px}.examErrorSummary{margin:16px 0}.examTimeInputs input{width:100%}#examTeacherDetail{border-top:2px solid #cdd9ea;margin-top:20px;padding-top:20px}#examTeacherDetail td{white-space:pre-line}#examTeacherDetail td .button,#examTeacherDetail td button{display:inline-block;margin:3px;font-size:12px}#examCreate{max-width:960px}#examAdmin{margin-top:20px}
@media(max-width:760px){.examTimeline,.examTimeInputs{grid-template-columns:1fr}.examTimeline{gap:5px}.examTimeline>div{padding:9px}.examCenter .row{flex-wrap:wrap}.examUpload{padding:12px}.examCenter{padding:16px}.examCard .button{margin-bottom:4px}}