:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f7f9;--surface:#fff;--surface-2:#eef2f6;--ink:#17202a;--muted:#667085;--line:#d7dee8;--accent:#1463ff;--accent-2:#0f8b6f;--danger:#c43d3d;--success-bg:#e7f6ef;--danger-bg:#fae9e9;--shadow:0 12px 34px #141e2d17}*{box-sizing:border-box}body{background:var(--bg);min-height:100vh;color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,select{font:inherit}button{cursor:pointer}a{color:var(--accent)}.app-shell{grid-template-rows:auto 1fr auto;grid-template-columns:minmax(0,1fr) 320px;gap:18px;min-height:100vh;padding:18px;display:grid}.topbar,.credit{grid-column:1/-1}.topbar{background:var(--surface);border:1px solid var(--line);min-height:72px;box-shadow:var(--shadow);border-radius:8px;justify-content:space-between;align-items:center;padding:14px 18px;display:flex}.brand{align-items:center;gap:14px;min-width:0;display:flex}.brand h1{margin:0;font-size:21px;line-height:1.2}.brand p{color:var(--muted);margin:4px 0 0;font-size:13px}.brand-large h1{font-size:24px}.brand-mark{background:#17202a;border-radius:8px;flex:none;grid-template-columns:repeat(3,8px);align-items:end;gap:4px;width:44px;height:44px;padding:9px;display:grid}.brand-mark span{border-radius:2px 2px 0 0;width:8px;display:block}.brand-mark span:first-child{background:#ffb020;height:15px}.brand-mark span:nth-child(2){background:#32b188;height:24px}.brand-mark span:nth-child(3){background:#77a6ff;height:19px}.account-box{color:var(--muted);align-items:center;gap:10px;font-size:13px;display:flex}.account-box img{border-radius:999px;width:32px;height:32px}.workspace{grid-template-columns:minmax(0,1fr) 290px;gap:18px;min-width:0;display:grid}.sidebar{flex-direction:column;gap:14px;display:flex}.panel,.quiz-card,.review-panel,.signin-card{background:var(--surface);border:1px solid 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span{color:#08745d;background:#edf7f4;border-radius:999px;padding:4px 8px;font-size:12px}.quiz-card h2{margin:18px 0 8px;font-size:18px;line-height:1.35}.question-text{color:#27313d;white-space:pre-line;margin:0 0 18px;font-size:17px;line-height:1.7}.choices{gap:10px;display:grid}.choice{border:1px solid var(--line);background:var(--surface);width:100%;color:var(--ink);text-align:left;border-radius:8px;grid-template-columns:32px minmax(0,1fr);align-items:start;gap:12px;padding:14px;line-height:1.5;display:grid}.choice[aria-pressed=true]{border-color:var(--accent);background:#eef4ff}.choice.correct{background:var(--success-bg);border-color:#6fc69f}.choice.wrong{background:var(--danger-bg);border-color:#ef9b9b}.choice-control{background:var(--surface-2);width:26px;height:26px;color:var(--muted);border-radius:999px;place-items:center;font-size:12px;font-weight:800;display:inline-grid}.choice[aria-pressed=true] 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