:root{--ink:#183044;--muted:#5d6d7b;--blue:#214ee7;--teal:#167467;--line:#d9e2e9;--bg:#f1f5f8;--red:#a52b32}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}header{background:#142f40;color:white;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px max(20px,calc((100% - 1050px)/2));position:sticky;top:0;z-index:3}header a{color:white;text-decoration:none;font-weight:800;font-size:13px;letter-spacing:.1em;white-space:nowrap}header a span{display:block;font-size:12px;font-weight:400;letter-spacing:.02em;opacity:.75}header>div{display:flex;gap:16px;align-items:center}#save-status{font-size:12px}main{max-width:1000px;margin:28px auto;padding:0 20px;min-height:70vh}.card{background:white;border:1px solid var(--line);padding:30px;border-radius:18px;margin-bottom:18px;box-shadow:0 7px 24px #18304406}h1{font-size:30px;line-height:1.18;margin:12px 0 18px;letter-spacing:-.025em}h2{font-size:21px;line-height:1.3}h3{font-size:17px}p{margin:10px 0 16px}.eyebrow{text-transform:uppercase;font-size:11px;letter-spacing:.14em;font-weight:750;color:var(--teal)}.muted,small{color:var(--muted)}small{font-size:12px}button,.button{font:inherit;font-size:14px;font-weight:650;border-radius:9px;padding:12px 17px;border:1px solid transparent;background:var(--blue);color:white;cursor:pointer;display:inline-block;text-decoration:none}button:hover,.button:hover{filter:brightness(.95)}button:disabled{opacity:.48;cursor:not-allowed}.quiet{background:white;color:var(--ink);border-color:var(--line)}.text-button{background:none;color:var(--blue);border:0;padding:4px 7px}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #df9a2e;outline-offset:3px}input,textarea{font:inherit;border:1px solid #93a6b8;border-radius:8px;padding:12px;width:100%}input{max-width:430px}label{display:block;margin:12px 0 6px;font-weight:650}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.metric{background:#f4f7fa;border-radius:12px;padding:15px}.metric strong{display:block;font-size:26px;line-height:1.2}.metric span{font-size:12px;color:var(--muted)}.progress{height:7px;background:#e5ebef;border-radius:10px;overflow:hidden}.progress i{display:block;height:100%;background:var(--teal)}.row,.nav{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}.nav{margin-top:24px}.session{border-top:1px solid var(--line);padding:16px 0}.post{white-space:pre-wrap;overflow-wrap:anywhere;background:#f6f8fb;border-left:3px solid #93b6c1;border-radius:7px;padding:22px;margin:20px 0;font-size:16px}.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}.choice{background:white;border-color:var(--line);color:var(--ink);text-align:left;min-height:62px;padding:13px 16px;font-size:14px}.choice[aria-pressed=true]{border:2px solid var(--teal);background:#eaf6f2;padding:12px 15px}.question{margin:24px 0;padding:0 6px;border:2px solid transparent;border-radius:10px}.question.missing{border-color:var(--red);background:#fff8f8}.hint{border-left:3px solid #d3b36a;background:#fffaf0;padding:12px 16px;margin:12px 0;font-size:14px}.hint p{margin:6px 0}.feedback{padding:14px 16px;border-radius:8px;margin:10px 0;background:#eef3ff}.feedback.good{background:#eaf6f2}.feedback.bad{background:#fff2ed}.notice{padding:16px;border-radius:10px;background:#eef3f8}.danger{color:var(--red)}details{margin:15px 0}summary{cursor:pointer;font-weight:650}.reason-box{margin:12px 0}.discussion{border-left:3px solid #d3b36a;background:#fffaf0;padding:14px 16px;margin:12px 0;font-size:14px}.discussion p{margin:6px 0}.locked-reading{background:#eef5f2;border:1px solid #a8d0c2;border-radius:9px;padding:14px 16px}.locked-reading p{margin:5px 0 0;font-size:14px}dialog{border:1px solid var(--line);border-radius:16px;max-width:850px;width:calc(100% - 28px);max-height:90vh;padding:25px}dialog::backdrop{background:#102a3bbb}.dialog-top{display:flex;align-items:center;justify-content:space-between;position:sticky;top:-25px;background:white;padding:10px 0;z-index:1}.guide-option{margin:12px 0;padding:14px 16px;background:#f4f7fa;border-radius:8px}.guide-option strong{display:block;font-size:15px}.guide-option p{font-size:14px;margin:6px 0}.guide-list li{margin:12px 0}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#842c35;color:white;padding:14px 20px;border-radius:10px;z-index:10;display:none;max-width:90vw;box-shadow:0 7px 30px #0003}footer{max-width:1000px;margin:20px auto;padding:15px 20px;color:var(--muted);font-size:12px}.symbol{font-size:34px;display:block;text-align:center}.center{text-align:center}.check{display:flex;align-items:flex-start;gap:12px;font-weight:400}.check input{width:auto;margin-top:6px}.pill{font-size:12px;padding:4px 9px;border-radius:20px;background:#eaf6f2;color:var(--teal)}.clock{font-variant-numeric:tabular-nums}.storage-failed{border:3px solid var(--red)}@media(max-width:650px){main{padding:0 12px;margin-top:16px}.card{padding:20px}.choices{grid-template-columns:1fr}h1{font-size:25px}header{padding:12px}#save-status{max-width:110px;font-size:10px}.metric{padding:10px}.metric strong{font-size:22px}.post{padding:16px}.metrics{gap:7px}}
.reflection{margin-top:12px;padding:12px 15px;border-left:3px solid #6677ae;background:#f1f3fa;border-radius:5px;font-size:14px}
.example-table-wrap{overflow-x:auto;margin:16px 0 24px;border:1px solid var(--line);border-radius:10px}
.example-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:14px;line-height:1.45}
.example-table th,.example-table td{vertical-align:top;text-align:left;padding:14px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}
.example-table thead th{background:#edf3f7;font-weight:750}
.example-table tbody th{width:34%;font-weight:550;background:#fafcfd}
.example-table tbody tr:last-child th,.example-table tbody tr:last-child td{border-bottom:0}
.example-table td strong{display:block;color:#183044}
.example-table td p{margin:6px 0 0;color:var(--muted)}
.example-number{display:inline-block;margin-right:6px;font-weight:800;color:var(--teal)}
[hidden]{display:none!important}
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#timer-status{font-size:13px;white-space:nowrap;color:#e9f2f9}
#timer-status strong{display:block;color:white;font-size:15px;line-height:1.2}
.start-task{background:#c92f38;border-color:#9b2028;margin:14px 0 0 12px;font-weight:800}
.start-task:hover{background:#af2730}
.copy-reason{font-size:12px;padding:7px 10px;margin-top:8px}
@media(max-width:650px){header{align-items:flex-start}header>div{gap:8px;flex-wrap:wrap;justify-content:flex-end}#timer-status{order:0;text-align:right;font-size:11px}#timer-status strong{font-size:13px}#save-status{order:2}#guide-open{order:1;padding:8px 10px}}
.prior-label{font-size:17px;font-weight:750;line-height:1.35;margin:8px 0}
.review-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0}
.review-action{background:#fff;color:var(--ink);border-color:#aab9c5;text-align:left;min-height:52px}
.review-action[aria-pressed=true]{background:#eaf6f2;border:2px solid var(--teal);padding:11px 16px}
.response-summary{color:var(--teal);font-weight:650;margin:6px 0}
.response-prompt{font-weight:700;margin:18px 0 8px}
.required{font-size:12px;color:var(--red);margin-left:5px}
.disagreement-reason{max-width:100%}
.worked-examples{border-top:1px solid var(--line);padding-top:14px;margin-top:22px}
.worked-examples summary{font-size:16px}
.guide-option{padding:9px 12px;margin:7px 0}
.guide-option strong{font-size:14px}
.guide-option p{margin:3px 0;font-size:13px}
.guide-list li{margin:7px 0}
@media(max-width:650px){.review-actions{grid-template-columns:1fr}.review-action{min-height:48px}}