:root{color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,sans-serif;background:#0a1117;color:#e9f0f2;--border:#29343e;--muted:#a5b5be;--lime:#c4ef91;--panel:#121d26}*{box-sizing:border-box}body{margin:0}header{max-width:1400px;margin:auto;padding:23px 40px;display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--border)}a{color:var(--lime)}.brand{display:flex;align-items:center;gap:9px;color:inherit;text-decoration:none;font-size:20px}.brand>span{color:var(--lime)}#connection{font-size:13px;color:var(--muted)}main{max-width:1360px;margin:auto;padding:38px 40px}.intro{display:grid;grid-template-columns:1.5fr 1fr;gap:60px;align-items:center;margin-bottom:30px}.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:700;color:var(--lime)}h1{font-size:clamp(33px,4.7vw,57px);line-height:1.05;margin:12px 0 19px;letter-spacing:-.045em}h1 span{color:var(--lime)}.lead{color:var(--muted);font-size:16px;max-width:620px;line-height:1.65}.identity{border-left:2px solid var(--lime);padding:16px 25px}.identity p{line-height:1.65}small{color:var(--muted);line-height:1.6;font-size:12px}.pill{font-size:10px;letter-spacing:.08em;border:1px solid #42574b;border-radius:20px;padding:6px 9px;color:var(--lime);display:inline-block}.workspace{display:grid;grid-template-columns:.95fr 1.05fr;gap:20px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:24px;min-width:0}.section-title{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:16px}h2{font-size:14px;margin:0}h3{font-size:17px}p{line-height:1.55}button,.file-button{font:600 12px/1.35 inherit;color:inherit;background:#25333e;border:1px solid #47545c;border-radius:9px;padding:11px 13px;cursor:pointer;display:inline-block;text-decoration:none}button:hover,.file-button:hover{border-color:var(--lime)}button:disabled{opacity:.4;cursor:not-allowed}.primary{background:var(--lime);color:#172815;border:0}.quiet{background:transparent;color:var(--muted);border:0;padding:7px}textarea,input{font:15px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;background:#091219;color:#e9f0f2;border:1px solid #3c4b58;border-radius:9px;width:100%;max-width:100%;padding:12px;min-width:0}textarea{resize:vertical}input:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:2px solid var(--lime);outline-offset:3px}label{display:block;color:var(--muted);font-size:12px;margin:8px 0}#messages{height:250px;overflow:auto;scroll-behavior:smooth;padding-right:8px}.bubble{background:#1d303b;border-radius:10px;padding:12px 14px;margin:9px 0;font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere}.bubble.user{margin-left:50px;background:#283928}.bubble strong{display:block;color:var(--lime);font-size:10px;letter-spacing:.08em;margin-bottom:5px}.send{display:flex;gap:8px;align-items:stretch}.send input{flex:1;min-width:0}.send button{flex-shrink:0}.help-actions,.board-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.audit{padding:13px;margin-top:15px;background:#1b2c32;border-left:3px solid var(--lime);font-size:13px;line-height:1.6;white-space:pre-line}#witness{background:#322c20;color:#f4d996;padding:14px;border-radius:9px;margin-top:10px;font:14px/1.6 ui-monospace,monospace}#card{margin-top:20px;border-top:1px solid var(--border);padding-top:10px}.equation{font:23px/1.4 ui-monospace,monospace;color:var(--lime)}#cardHelp{font-size:12px;color:var(--muted)}.progress{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:20px;align-items:center;margin-top:20px}.progress p,.handoff p{color:var(--muted);font-size:13px;margin:10px 0 0}.metric strong{display:block;font-size:34px;color:var(--lime);font-variant-numeric:tabular-nums}.metric span{font-size:11px;color:var(--muted)}.handoff{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin-top:20px}.handoff-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center}input[type=file]{width:1px;height:1px;position:absolute;opacity:0;padding:0}#load:focus+.file-button{outline:2px solid var(--lime)}details{margin-top:20px;font-size:13px;color:var(--muted)}summary{cursor:pointer;color:#e9f0f2}pre{font-size:11px;white-space:pre-wrap;overflow-wrap:anywhere;max-height:220px;overflow:auto}#error{margin-top:16px;padding:15px;border:1px solid #cf806b;background:#352323;border-radius:10px}footer{font-size:11px;color:var(--muted);line-height:1.6;margin:25px 5px}#phase{white-space:nowrap}.empty{color:var(--muted)}[hidden]{display:none!important}@media(max-width:780px){header{padding:18px;flex-wrap:wrap}main{padding:24px 16px}.intro,.workspace,.handoff{grid-template-columns:1fr;gap:20px}.intro{margin-bottom:22px}.identity{padding:10px 15px}.panel{padding:18px}.progress{grid-template-columns:repeat(3,1fr);gap:12px}.progress>div:first-child{grid-column:1/-1}.send{flex-wrap:wrap}.send input{flex-basis:65%}h1{font-size:42px}.section-title{flex-wrap:wrap}.brand{font-size:18px}}

/* Guided repair: the same exact engine, less workboard friction. */
.repair-desk{margin:18px 0 24px}.next-move{padding:18px;border-left:3px solid #b9f38b;background:#141f22;border-radius:8px}.next-move h3{font-size:21px;margin:6px 0}.next-move p{max-width:60ch;line-height:1.5}.repair-desk label{display:block;margin:12px 0 6px}.repair-desk select,.repair-desk input{max-width:100%;width:100%;box-sizing:border-box;background:#0c1319;color:#eff8f0;border:1px solid #43535a;border-radius:8px;font:inherit;padding:12px}.repair-desk button{max-width:100%;white-space:normal;line-height:1.4;margin:12px 0}.repair-desk small{display:block;line-height:1.5}.repair-desk ol{padding-left:32px}.repair-desk li{font-family:ui-monospace,monospace;overflow-wrap:anywhere;padding:8px;border-bottom:1px solid #26373b}.repair-desk .first-error{background:#422e18;border-left:3px solid #ffd08a}.repair-desk .original{color:#a8bbc4}.repair-desk [hidden]{display:none}

/* The shared note shows actual questions, not unexplained answer rows. */
.study-preview{margin-top:20px}.study-preview pre{font-size:13px;line-height:1.6;max-height:none;white-space:pre-wrap;overflow-wrap:anywhere}.study-preview:focus{outline:2px solid var(--lime);outline-offset:4px}

.demo-player{width:100%;border-radius:20px}