:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;color:#17212b;background:#eef3f2;--brand:#007c7a;--ink:#17212b;--muted:#64727c;--line:#d8e1df;--good:#dff5e4;--bad:#fde4e1}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 8% 0,#d9efec,transparent 28%),#eef3f2}header{display:flex;justify-content:space-between;align-items:center;padding:24px 4vw;background:#0e2028;color:white}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-size:clamp(1.5rem,3vw,2.2rem)}small{font-weight:800;letter-spacing:.08em;color:#80d7d0}.stats{display:flex;gap:10px;flex-wrap:wrap}.stats span{background:#17343d;padding:9px 13px;border-radius:999px;font-weight:700}main{display:grid;grid-template-columns:270px 1fr;gap:18px;padding:22px 4vw}.panel,.card,.session{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 30px #17343d12}.panel{padding:20px;height:max-content;position:sticky;top:18px}.panel label{display:block;margin:18px 0;font-weight:700}.panel input[type=number]{display:block;width:100%;margin-top:7px;padding:11px;border:1px solid var(--line);border-radius:9px}.check{display:flex!important;gap:9px;align-items:center}.check input{accent-color:var(--brand)}button{border:0;border-radius:10px;background:var(--brand);color:white;padding:12px 16px;font-weight:800;cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}.panel button{width:100%;margin-top:9px}.secondary,.ghost{background:#e5f0ee;color:#17423f}.ghost{width:auto}.summary{margin-top:18px;padding:13px;border-radius:10px;background:#f2f7f6;line-height:1.5}.workspace{min-width:0}.session{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;margin-bottom:16px}.session h2{margin:3px 0 0}.card{min-height:360px;padding:28px}.card.empty{display:grid;place-content:center;text-align:center;color:var(--muted)}.qnum{font-size:.8rem;font-weight:900;color:var(--brand);letter-spacing:.08em}.question{font-size:1.25rem;line-height:1.45;margin:10px 0 24px}.option{display:flex;width:100%;text-align:left;gap:13px;background:#fff;color:var(--ink);border:1px solid var(--line);margin:10px 0;padding:15px}.option b{display:grid;place-items:center;min-width:28px;height:28px;border-radius:50%;background:#e7f3f1;text-transform:uppercase}.option.selected{border-color:var(--brand);box-shadow:0 0 0 2px #007c7a22}.option.correct{background:var(--good);border-color:#55a869}.option.wrong{background:var(--bad);border-color:#d66a5d}.explanation{margin-top:22px;padding:16px;background:#f4f7fb;border-left:4px solid var(--brand);line-height:1.55}nav{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin:14px 0}.grid{display:flex;flex-wrap:wrap;gap:7px}.grid button{width:38px;height:38px;padding:0;background:white;color:var(--ink);border:1px solid var(--line)}.grid button.current{background:var(--brand);color:white}.grid button.done{border-color:#55a869}@media(max-width:760px){header{align-items:flex-start;gap:14px;flex-direction:column}main{grid-template-columns:1fr}.panel{position:static}nav{grid-template-columns:1fr}.card{padding:20px}}