:root{--ink:#232735;--muted:#697080;--accent:#a32672;--accent-soft:#f6eaf1;--line:#e6e8ed;--surface:#fff;--canvas:#f7f8fa;--success:#23785c}
*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font:15px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}a{color:var(--accent)}button,.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 17px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);font-weight:650;font-size:14px;text-decoration:none;cursor:pointer;transition:background .16s,border-color .16s,box-shadow .16s}button:hover,.btn:hover{background:#f6f3f6;border-color:#cdb8c7}button.primary{background:var(--accent);border-color:var(--accent);color:white}button.primary:hover{background:#87205e}button:disabled{opacity:.55;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #b65390;outline-offset:3px}header{min-height:94px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 36px}.brand{display:flex;align-items:center;gap:24px;text-decoration:none;color:var(--ink)}.brand img{width:180px;height:62px;object-fit:contain}.brand>span{border-left:1px solid var(--line);padding-left:24px;font-size:18px;font-weight:750}.brand small{display:block;color:var(--muted);font-size:12px;font-weight:450}#identity{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:14px}#identity button{font-size:12px;min-height:34px;padding:7px 12px}.shell{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:calc(100vh - 94px);max-width:1680px;margin:auto}.shell>aside{border-right:1px solid var(--line);padding:30px 16px;background:white}nav{display:grid;gap:6px;position:sticky;top:24px}nav button{justify-content:flex-start;text-align:left;background:transparent;border:0;padding:13px 16px;color:#646a79;font-weight:600}nav 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#2922370b;transform:translateY(-2px)}.topic-symbol{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:#f0edf6;color:#716187;border-radius:11px;font-size:23px;margin-bottom:20px;font-weight:550}.topic-card:nth-child(3n+2) .topic-symbol{color:#9b6860;background:#faf0eb}.topic-card:nth-child(3n) .topic-symbol{color:#4b7d74;background:#eaf4f0}.topic-card h3{font-size:19px;letter-spacing:-.4px;min-height:25px}.topic-card p{font-size:13px;color:var(--muted);margin:0 0 20px}.topic-progress{width:100%;margin-top:auto;margin-bottom:20px}.topic-card button{width:100%}progress{display:block;width:100%;height:7px;border:0;border-radius:20px;overflow:hidden;background:#ececf1;accent-color:var(--accent);margin:10px 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p{color:var(--muted)}label{display:grid;gap:6px;font-size:12px;font-weight:650;color:#555d6b;margin:12px 0}input,select,textarea{width:100%;padding:11px 12px;border:1px solid #dce0e7;border-radius:8px;background:white;color:var(--ink);min-height:44px}textarea{min-height:110px;resize:vertical}input[type=checkbox]{width:18px;min-height:18px;accent-color:var(--accent)}.check{display:flex;align-items:center;gap:12px}.filters,.actions{display:flex;align-items:flex-end;flex-wrap:wrap;gap:10px;margin:18px 0}.filters label{flex:1;min-width:130px}.actions button{margin:0}blockquote{border-left:3px solid #ab96b7;background:#f6f3f9;padding:20px;margin:0 0 20px;white-space:pre-wrap}.row{border-top:1px solid var(--line);padding:16px 0}.row p{margin:10px 0}.row button{margin:4px}.error{color:#b42d43}.feedback{background:#eff8f3;border:1px solid #d8e9df;border-radius:10px;padding:18px;margin:16px 0}.bars{display:flex;align-items:flex-end;gap:18px;min-height:110px;overflow-x:auto;padding-top:10px}.bar{min-width:44px;text-align:center;flex:1}.bar i{display:block;background:#bd91ac;border-radius:5px 5px 0 0;margin:5px 0}.bar small{white-space:nowrap}summary{cursor:pointer;font-weight:650;color:#555466}details[open]>summary{margin-bottom:14px}dialog{width:min(820px,95vw);max-height:94vh;border:1px solid var(--line);border-radius:18px;padding:32px;color:var(--ink);background:#f9fafc;box-shadow:0 30px 90px #1d16282b}dialog::backdrop{background:#23263688;backdrop-filter:blur(3px)}#close{position:sticky;top:0;float:right;margin:-12px -12px 8px 10px;width:38px;height:38px;min-height:38px;padding:0;border-radius:50%;font-size:24px;z-index:3}dialog.study{width:min(1040px,96vw)}#inside>h2{margin-right:40px}.reading{display:block}.sourcepane:empty{display:none}.sourcepane{margin-bottom:18px}.answers form{margin-top:18px}.answers label{font-size:14px}.native-task{margin:20px 0;background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden}.task-caption{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 16px;background:#faf9fc;border-bottom:1px solid var(--line);color:var(--muted);font-size:12px}.task-caption label{display:flex;align-items:center;gap:10px;margin:0}.task-caption select{min-height:32px;padding:4px;font-size:12px}.task-scroll{overflow-x:auto;padding:14px}.task-paper{width:100%;min-width:100%;background:white}.task-vector{display:block;width:100%;height:auto;background:white}.full-context{border:0;border-top:1px solid var(--line);border-radius:0;margin:0;padding:14px;font-size:12px}.full-context img,.inline-key img{display:block;width:100%;height:auto;background:white;margin:10px 0}.full-context:not([open]) img,.inline-key:not([open]) img{display:none}#studyNav{position:sticky;top:0;z-index:2;border:1px solid var(--line);background:#fffefded;border-radius:10px;padding:12px;backdrop-filter:blur(8px)}#studyNav strong{margin-right:auto}#studyNav span{font-size:12px;color:var(--muted)}.series-options{display:grid;gap:12px;margin:24px 0}.series-options button{justify-content:flex-start;padding:18px}.completion{text-align:center;padding:25px 10px}.completion button{margin:8px}.completion-mark{display:inline-flex;align-items:center;justify-content:center;font-size:36px;width:80px;height:80px;background:#e7f4ed;color:var(--success);border-radius:50%;margin:0 0 24px}.report-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}.report-metrics>div{display:flex;flex-direction:column;padding:18px;background:white;border:1px solid var(--line);border-radius:10px}.report-metrics strong{font-size:29px;letter-spacing:-1px}.report-metrics span{color:var(--muted);font-size:12px}dialog:has(.report-metrics){width:min(1100px,96vw)}canvas{border:1px solid #cdd4dc;max-width:100%;background:white;touch-action:none}#notice:not(:empty),#dialogNotice:not(:empty){background:#303341;color:white;border-radius:10px;padding:14px 20px;font-size:14px;box-shadow:0 6px 25px #0002}#notice:not(:empty){position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:10;max-width:90vw}#dialogNotice:not(:empty){position:sticky;bottom:0;z-index:10}.empty-state{padding:32px;border:1px dashed #ccd0d8;border-radius:12px;color:var(--muted)}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(min-width:1450px){.topic-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:1100px){.shell{grid-template-columns:180px minmax(0,1fr)}main{padding:28px 24px}.shell>aside{padding:26px 8px}nav button{padding:12px 10px;font-size:13px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.brand img{width:155px}}
@media(max-width:740px){header{padding:12px 16px;min-height:80px}.brand{gap:10px}.brand img{width:120px;height:45px}.brand>span{font-size:14px;padding-left:12px}.brand small{display:none}#identity{gap:8px;font-size:11px}#identity button{font-size:11px;padding:6px 8px}.shell{display:block}.shell>aside{border-right:0;border-bottom:1px solid var(--line);padding:10px 12px}nav{display:flex;position:static;overflow-x:auto}nav button{white-space:nowrap;padding:9px 12px}nav button::before{display:none}main{padding:22px 16px}.hero{padding:24px;margin-bottom:22px}.hero h1{font-size:30px;letter-spacing:-1px}.hero p{font-size:14px}.section-heading{align-items:flex-start;flex-direction:column;gap:12px}.section-heading h2{font-size:22px}.topic-controls{grid-template-columns:1fr 1fr;padding:14px;gap:12px}.topic-controls label:last-child{grid-column:1/-1}.topic-grid{gap:12px}.topic-card{padding:18px}.topic-card h3{font-size:16px}.topic-card button{font-size:12px;padding:9px}.topic-symbol{margin-bottom:16px}.resume-card{align-items:flex-start;padding:16px}.resume-card h3{font-size:15px}.resume-card button{font-size:12px;white-space:nowrap}dialog{padding:22px 16px;max-height:96vh}.answers form{padding:14px}.task-caption{padding:8px;align-items:flex-start;flex-direction:column}.task-scroll{padding:5px}.report-metrics{grid-template-columns:repeat(2,1fr)}#studyNav{gap:8px;padding:10px}#studyNav button{font-size:12px;padding:8px}.panel{padding:18px}.bars{gap:8px}}
@media(max-width:390px){.topic-grid{grid-template-columns:1fr}.brand>span{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
/* V5: grouped tasks, persistent tests, account approval and individual timing */
.run-header{border-bottom:1px solid #dce4df;padding:0 0 1.2rem;margin-bottom:1rem}.run-header h2{margin:.4rem 0}.run-header #runClock{font-size:1.45rem;font-weight:750;font-variant-numeric:tabular-nums;color:#164d40}.run-header #runClock.overtime{color:#9a4a19}.run-header small{display:block;margin-top:.5rem;color:#52675d}.run-jumps{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.5rem}.run-jumps button{min-width:2.5rem;padding:.45rem}.run-jumps .on{background:#174d40;color:white}.run-reading{align-items:start}.run-reading .sourcepane{min-width:0}.run-reading .answers{min-width:0}.run-reading .answer-part{padding:1rem;border:1px solid #d7e1da;box-shadow:none}.answer-part textarea{min-height:5rem}.run-footer{display:flex;gap:.7rem;flex-wrap:wrap;border-top:1px solid #dce4df;padding-top:1rem;margin-top:1rem}.saved-drawing{display:block;max-width:100%;max-height:24rem;object-fit:contain;background:white;border:1px solid #dce4df}.result-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.result-comparison section{padding:1rem;background:#f5f7f3;border-radius:.8rem}.answer-text{white-space:pre-wrap;overflow-wrap:anywhere}.timing-student{display:grid;grid-template-columns:1fr 2fr 1fr;gap:1rem;align-items:center;border-top:1px solid #dce4df;padding:1rem 0}.role-tag{font-size:.75rem;background:#e8efe7;border-radius:20px;padding:.3rem .6rem}.topic-controls{flex-wrap:wrap}.run-reading canvas{touch-action:none;max-width:100%;background:white}.answer-part img{margin-top:1rem}#finishConfirm{border:2px solid #174d40}#modal .error:empty{display:none}
@media(min-width:1000px){.run-reading{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,1fr);gap:1.5rem}.run-reading .answers{max-height:75vh;overflow:auto}}@media(max-width:700px){.result-comparison{grid-template-columns:1fr}.timing-student{grid-template-columns:1fr}.run-reading{display:block}.run-header #runClock{font-size:1.2rem}.role-tag{display:none}.run-footer button{flex:1}}