:root{--navy:#13243b;--ink:#172941;--muted:#647185;--paper:#f6f5f0;--line:#dfe3e7;--orange:#ed613f;--green:#186953;--soft:#eaf3ee;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{border:1px solid transparent;border-radius:8px;background:var(--navy);color:#fff;padding:12px 18px;font-weight:650;cursor:pointer;line-height:1.3}button:hover{filter:brightness(1.15)}button:disabled{opacity:.45;cursor:default}button.secondary{background:#fff;color:var(--ink);border-color:var(--line)}button.quiet{background:transparent;color:var(--muted);padding:9px 12px}button.accent{background:var(--orange);color:#fff}input,select,textarea{border:1px solid #b4bec9;border-radius:7px;padding:11px;background:white;color:var(--ink)}:focus-visible{outline:3px solid #d65b25;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(30px,4vw,52px);font-weight:680;letter-spacing:-1.6px;line-height:1.12}h2{font-size:24px;letter-spacing:-.5px}h3{font-size:17px}p{line-height:1.7}.muted{color:var(--muted)}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.8px;text-transform:uppercase}.topbar{display:flex;align-items:center;gap:32px;padding:20px 5%;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:12px;font-weight:750;letter-spacing:1.7px}.brandmark{background:var(--navy);color:#fff;padding:12px 8px;border-radius:8px;font-size:18px;letter-spacing:-1px}.brand small{display:block;font-size:9px;color:var(--muted);margin-top:5px;letter-spacing:1.4px}nav{display:flex;gap:26px;margin-left:auto}nav a{text-decoration:none;font-size:13px;font-weight:600}.save-state{font-size:11px;color:var(--muted);border-left:1px solid var(--line);padding-left:22px}#main{max-width:1320px;margin:auto;padding:40px 5% 70px}.hero{display:grid;grid-template-columns:1.45fr 1fr;gap:40px;background:var(--navy);color:white;padding:40px;border-radius:16px;position:relative;overflow:hidden}.hero .eyebrow{color:#f59f7c}.hero h1{max-width:600px;margin:17px 0}.hero p{color:#c2cede;font-size:15px;max-width:550px}.hero .actions{margin-top:24px}.hero-visual{display:flex;flex-direction:column;justify-content:center;gap:14px;min-width:0}.chain{display:flex;align-items:center;justify-content:center;gap:10px}.node{border:1px solid #8a9ab0;border-radius:8px;width:60px;height:62px;display:grid;place-items:center;font:24px ui-monospace,monospace;background:#203651}.node.mark{border-color:var(--orange);background:#613e3b}.arrow{color:#f2946e;font-size:23px}.chain-label{font:11px ui-monospace,monospace;color:#b0c1d4;text-align:center}.visual-note{margin:18px auto 0;max-width:310px;border-top:1px solid #40526a;padding-top:16px;font-size:13px;line-height:1.6;color:#c5d0df}.visual-note b{color:white}.stats{display:grid;grid-template-columns:repeat(4,1fr);margin:24px 0 36px;border:1px solid var(--line);border-radius:10px;background:#fff}.stat{padding:20px 24px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat b{display:block;font-size:27px;letter-spacing:-1px}.stat span{font-size:11px;color:var(--muted)}.section-title{display:flex;justify-content:space-between;align-items:center;gap:14px;margin:30px 0 18px}.section-title h2{margin:0}.section-title p{margin:0;font-size:13px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:white;border:1px solid var(--line);border-radius:10px;padding:24px;display:flex;flex-direction:column;gap:8px}.card p{font-size:13px;color:var(--muted);margin-bottom:12px}.card h3{margin-bottom:2px}.card .topic-number{color:var(--orange);font:12px ui-monospace,monospace}.card .actions{margin-top:auto}.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.actions .spacer{flex:1}.pill{display:inline-flex;align-items:center;gap:6px;padding:6px 9px;border-radius:5px;background:#eef1f5;color:#506074;font-size:11px;font-weight:650}.configure{padding:26px;background:#eceeea;border:1px solid #d7ddd7;border-radius:10px;margin-top:24px}.config-fields{display:flex;align-items:end;gap:14px;flex-wrap:wrap}label.field{display:flex;flex-direction:column;gap:7px;font-size:12px;color:var(--muted)}.config-fields label:first-child{flex:1}.config-fields input{width:95px}.note{border-left:3px solid var(--orange);padding:12px 17px;background:#fff6ed;font-size:13px;line-height:1.65;margin:20px 0}.session-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:24px}.session-head h1{font-size:25px;letter-spacing:-.5px;margin:4px 0 0}.session-head .timer{font:22px ui-monospace,monospace;white-space:nowrap}.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:25px;align-items:start}.sidebar{padding:22px;background:white;border:1px solid var(--line);border-radius:10px;position:sticky;top:20px}.sidebar h2{font-size:14px}.sidebar p{font-size:12px}.numbers{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-top:18px;max-height:440px;overflow:auto}.numbers button{padding:8px 0;background:#f2f4f6;color:var(--ink);font-size:12px;border:1px solid transparent;border-radius:5px}.numbers button.current{border:2px solid var(--navy)}.numbers button.draft{background:#e0e9f6}.numbers button.correct{background:#d9eee3;color:var(--green)}.numbers button.wrong{background:#fde5de;color:#9e3424}.numbers button.reviewed{background:#eae1f6;color:#6a4080}.numbers button.flagged:after{content:'•';color:var(--orange)}progress{width:100%;accent-color:var(--green);height:6px}.workspace{background:#fff;border:1px solid var(--line);border-radius:12px;padding:32px;min-width:0}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:22px}.workspace h2{font-size:27px;line-height:1.25;margin-bottom:20px}.prompt{white-space:pre-wrap;line-height:1.8;font-size:15px}.code-prompt,pre{font:13px/1.75 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#f1f4f7;border-radius:8px;padding:18px;overflow:auto;color:#233f5a}.options{display:grid;gap:10px;margin-top:24px}fieldset{border:0;padding:0;margin:0;min-width:0}.option{display:flex;align-items:center;gap:13px;padding:16px;border:1px solid #d8dee6;border-radius:8px;cursor:pointer;font-size:14px;line-height:1.5}.option:has(input:checked){border-color:#365986;background:#edf3fc}.option.right{border-color:#388260;background:#edf7f1}.option.wrong{border-color:#c3715b;background:#fff2ed}.option input{width:17px;height:17px;accent-color:var(--navy);flex:none}.option .letter{font:12px ui-monospace,monospace;color:var(--muted)}textarea{width:100%;resize:vertical;min-height:210px;line-height:1.65;margin-top:8px}.editor{font:13px/1.75 ui-monospace,monospace;min-height:300px;tab-size:2;background:#f7f9fb}.answer-label{display:block;margin-top:24px;font-weight:600;font-size:13px}.numeric{display:block;width:190px;max-width:100%;margin-top:8px}.question-footer{margin-top:27px;padding-top:22px;border-top:1px solid var(--line)}.feedback{background:#edf7f2;border:1px solid #c5e3d5;border-radius:8px;padding:20px;margin-top:23px}.feedback.incorrect{background:#fff3eb;border-color:#f4d8c4}.feedback.neutral{background:#f3f0f8;border-color:#dcd2e7}.feedback h3{margin-bottom:10px}.feedback p{font-size:14px;white-space:pre-wrap}.feedback p:last-child{margin-bottom:0}.hint{padding:13px;background:#fff8de;border-radius:7px;font-size:13px;line-height:1.6;margin-top:16px}.error{color:#a43824;font-size:13px;margin-top:10px}.source-link{display:inline-block;font-size:12px;color:var(--muted);margin-top:20px}.rubric{display:grid;gap:10px;margin-top:20px}.rubric label{font-size:13px;display:flex;align-items:start;gap:9px;line-height:1.5}.rubric input{accent-color:#725094;margin-top:3px}.rubric b{margin-left:auto;white-space:nowrap}.rubric-score{font-size:18px;font-weight:750;margin-top:15px}.content{max-width:900px;margin:auto}.content h1{font-size:39px}.content h2{margin:36px 0 16px}.content li{line-height:1.8;margin:7px 0}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px;background:white}td,th{text-align:left;padding:13px;border-bottom:1px solid var(--line);line-height:1.6}th{background:#e9edf2;font-size:12px}.content details{padding:17px;background:white;border:1px solid var(--line);border-radius:8px;margin:12px 0}.content summary{cursor:pointer;font-weight:650}.content details p{font-size:14px;margin-top:15px}.source-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.source-grid .card a{font-size:13px}.result-row{display:flex;gap:14px;align-items:center;width:100%;text-align:left;background:white;color:var(--ink);border:1px solid var(--line);margin-top:9px}.result-row span:last-child{margin-left:auto;min-width:85px;text-align:right;font-size:11px}.result-row small{font-size:10px;color:var(--muted);display:block;margin-top:5px}.result-row .index{font:12px ui-monospace,monospace;color:var(--muted)}.skip{position:absolute;left:10px;top:-60px;background:white;padding:10px;z-index:5}.skip:focus{top:10px}dialog{border:1px solid var(--line);border-radius:13px;max-width:450px;padding:30px;color:var(--ink)}dialog::backdrop{background:#13243b80}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden}#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);padding:12px 18px;background:var(--navy);color:white;border-radius:8px;font-size:13px;z-index:5}#toast:empty{display:none}.footer-note{font-size:12px;color:var(--muted);line-height:1.8;margin-top:35px}@media(max-width:1000px){.save-state{display:none}.layout{grid-template-columns:170px 1fr}.sidebar{padding:15px}.numbers{grid-template-columns:repeat(4,1fr)}.hero{gap:15px;padding:30px}.cards{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){.topbar{padding:14px 5%;gap:10px;flex-wrap:wrap}.brand{font-size:10px}.brandmark{font-size:16px;padding:10px 7px}nav{gap:15px;font-size:11px}nav a{font-size:11px}#main{padding-top:24px}.hero{grid-template-columns:1fr;padding:25px}.hero h1{font-size:36px}.hero-visual{display:none}.stats{grid-template-columns:1fr 1fr;margin-bottom:26px}.stat:nth-child(2){border-right:0}.stat:nth-child(-n+2){border-bottom:1px solid var(--line)}.stat{padding:16px}.cards,.source-grid{grid-template-columns:1fr}.section-title{align-items:start;flex-direction:column}.layout{grid-template-columns:1fr}.sidebar{position:static}.sidebar .numbers{grid-template-columns:repeat(8,1fr);max-height:130px}.sidebar h2,.sidebar p{display:none}.workspace{padding:21px}.workspace h2{font-size:23px}.question-meta{margin-bottom:16px}.session-head h1{font-size:22px}.session-head{flex-wrap:wrap}.session-head .timer{font-size:18px}.content h1{font-size:32px}.config-fields{align-items:stretch}.config-fields label:first-child{flex-basis:100%}.configure{padding:20px}.prompt{font-size:14px}.question-footer .actions button{padding:11px 13px}.result-row{padding:13px 10px;font-size:12px}.result-row span:last-child{min-width:60px}.question-meta .pill{max-width:65%}.footer-note{margin-top:24px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}.card{animation:appear .3s ease both}@keyframes appear{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}}