:root{--ink:#142d48;--muted:#53677d;--blue:#2456cc;--teal:#087d79;--purple:#7351b3;--line:#dbe4ec;--paper:#fff;--bg:#f3f6fa;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-size:16px;line-height:1.6}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--ink);padding:.6rem .9rem;border-radius:10px;font-weight:600}button:hover{border-color:var(--blue);background:#f0f5ff}button:disabled{cursor:wait;opacity:.55}a{color:var(--blue);text-underline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.3rem,5vw,4.5rem);line-height:1.09;letter-spacing:-.045em}h2{font-size:1.7rem;line-height:1.25;letter-spacing:-.025em}h3{font-size:1.12rem;line-height:1.4}p{margin-bottom:1rem}small,.muted{color:var(--muted)}:focus-visible{outline:3px solid 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minmax(0,1fr) 250px;gap:20px;align-items:start}.workspace .panel{padding:20px}.workspace h1{font-size:1.5rem;letter-spacing:-.025em}.workspace h2{font-size:1.12rem}.workspace p{font-size:.94rem}.concept{width:100%;text-align:left;display:block;margin:10px 0;font-size:13px}.concept small{display:block;font-weight:400}.concept.active{background:#eaf2ff;border-color:var(--blue)}.chat{max-height:510px;overflow:auto;scroll-behavior:auto;padding:4px 4px 18px}.message{padding:17px 20px;margin:14px 0;border:1px solid var(--line);background:#fff;border-radius:14px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:.96rem}.message.learner{background:#edf3fc;margin-left:32px;border-color:#d2dff3}.message .who{display:block;font-size:10px;font-weight:800;letter-spacing:1.5px;color:var(--teal);margin-bottom:8px}.message.learner .who{color:var(--blue)}.composer{border-top:1px solid var(--line);padding-top:14px}.composer 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0;color:#7d2923}.check-choice{display:block;text-align:left;width:100%;margin:8px 0;font-weight:500}.check-choice.selected{background:#e8efff;border-color:var(--blue)}.visual{background:#f1f6fb;padding:20px;border-radius:12px;text-align:center;margin:14px 0}.visual .nodes{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.visual .nodes span{background:white;border:1px solid #bbcddd;padding:8px 12px;border-radius:9px;font-size:13px}.visual small{display:block;margin-top:12px}.progress{height:7px;background:#e3eaf2;border-radius:8px;overflow:hidden;margin:12px 0}.progress i{display:block;height:100%;background:var(--teal);transition:width .4s}.guide{max-width:850px;margin:auto}.guide details{border:1px solid var(--line);background:white;border-radius:12px;padding:18px;margin:12px 0}.guide summary{cursor:pointer;font-weight:700}.guide details p{margin:14px 0 0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:24px 0}.stats strong{display:block;font-size:2rem}.history{margin:12px 0}.toggle{display:flex;gap:10px;align-items:center}.toggle input{width:auto}.empty{padding:36px;text-align:center;background:#edf2f7;border-radius:15px}.print-only{display:none}footer{padding:26px 4%;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;gap:20px}footer span{margin-left:auto}[hidden]{display:none!important}@media(max-width:1100px){.workspace{grid-template-columns:190px minmax(0,1fr)}.right-panel{grid-column:1/-1}.right-panel .insights{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.hero{gap:25px}}@media(max-width:760px){.topbar{flex-wrap:wrap;padding:18px 5%}nav{gap:2px}nav button,nav a{font-size:12px;padding:8px}main{padding:24px 5% 40px}.hero{grid-template-columns:1fr;padding-top:0;gap:12px}.hero-visual{padding:20px;transform:none}.hero h1{font-size:2.8rem}.grid{grid-template-columns:1fr 1fr}.split{grid-template-columns:1fr}.workspace{display:block}.tabs{display:flex;gap:6px;margin:12px 0}.tabs button{flex:1;font-size:12px}.workspace [data-panel]{display:none}.workspace [data-panel].visible{display:block}.right-panel .insights{display:block}.inline-form{flex-wrap:wrap}.inline-form>div{flex-basis:100%}.stats{grid-template-columns:1fr 1fr}.panel{padding:19px}.chat{max-height:460px}.section-head{align-items:start;flex-direction:column;gap:8px}.topic-card{padding:16px}.message.learner{margin-left:15px}}@media(max-width:390px){.grid{grid-template-columns:1fr}h1{font-size:2.3rem}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media print{body{background:white}.topbar,footer,#main,.notice{display:none!important}.print-only{display:block;white-space:pre-wrap;color:black;font:12pt/1.5 Georgia,serif;overflow-wrap:anywhere}}