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:root{--bg:#f7f3ea;--panel:#fff;--text:#1a1a1a;--muted:#5c5c5c;--border:#00000014;--shadow:0 10px 30px #00000014;--brand:#2a6fdb;--good:#137333;--bad:#b3261e;--radius:16px}html{height:100%}html,body{max-width:100vw;overflow-x:hidden}body{min-height:100%;color:var(--text);background:radial-gradient(900px 500px at 20% 0%, #fff7d6 0%, transparent 55%), radial-gradient(900px 500px at 80% 0%, #e9f0ff 0%, transparent 55%), var(--bg);font-family:var(--font-geist-sans), system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;flex-direction:column;display:flex}*{box-sizing:border-box;margin:0;padding:0}a{color:inherit;text-decoration:none}.container{width:min(1100px,100% - 32px);margin:0 auto}.topbar{z-index:10;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);background:#f7f3eab3;position:sticky;top:0}.topbarInner{justify-content:space-between;align-items:center;padding:14px 0;display:flex}.brand{align-items:center;gap:10px;display:flex}.brandMark{background:var(--panel);border:1px solid var(--border);border-radius:10px;justify-content:center;align-items:center;width:34px;height:34px;display:inline-flex;box-shadow:0 6px 18px #00000014}.brandText{letter-spacing:.2px;font-weight:800}.nav{align-items:center;gap:16px;display:flex}.navLink{color:var(--muted);font-weight:600}.navLink:hover{color:var(--text)}.layout{grid-template-columns:1fr 280px;gap:20px;padding:22px 0 40px;display:grid}.main{min-width:0}.sidebar{position:relative}.spacer{height:16px}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.cardHeader{border-bottom:1px solid var(--border);padding:18px 18px 12px}.cardBody{padding:18px}.h1{font-size:22px;line-height:1.25}.question{color:var(--text);font-size:16px;line-height:1.6}.choices{gap:10px;margin-top:16px;display:grid}.choice{border:1px solid var(--border);cursor:pointer;background:#00000003;border-radius:14px;align-items:flex-start;gap:10px;padding:12px;display:flex}.choice:hover{border-color:#00000029}.choice input{margin-top:2px}.choiceChecked{border-color:#2a6fdb59;outline:2px solid #2a6fdb40}.choiceCorrect{background:#1373330f;border-color:#13733359}.choiceWrong{background:#b3261e0f;border-color:#b3261e59}.actions{gap:10px;margin-top:10px;display:flex}.btn{background:var(--brand);color:#fff;cursor:pointer;border:0;border-radius:12px;padding:10px 14px;font-weight:700}.btn:disabled{opacity:.5;cursor:not-allowed}.btnSecondary{border:1px solid var(--border);color:var(--text);cursor:pointer;background:0 0;border-radius:12px;padding:10px 14px;font-weight:700}.input{border:1px solid var(--border);color:var(--text);background:#fff;border-radius:12px;outline:none;padding:10px 12px;font-size:15px}.input:focus{border-color:#2a6fdb73;box-shadow:0 0 0 4px #2a6fdb1f}.result{border:1px solid var(--border);border-radius:14px;margin-top:16px;overflow:hidden}.resultTitle{padding:12px 14px;font-weight:800}.resultBody{border-top:1px solid var(--border);padding:12px 14px 14px}.resultGood .resultTitle{color:var(--good)}.resultBad .resultTitle{color:var(--bad)}.explainTitle{margin-bottom:6px;font-weight:800}.explain{color:var(--muted);line-height:1.6}.adBox{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.adBoxTitle{text-transform:uppercase;letter-spacing:.12em;color:var(--muted);border-bottom:1px solid var(--border);padding:12px 14px 8px;font-size:12px}.adBoxBody{color:var(--muted);padding:14px;font-size:14px;line-height:1.4}.footer{border-top:1px solid var(--border);background:#ffffff73}.footerInner{color:var(--muted);justify-content:space-between;padding:18px 0;font-size:14px;display:flex}.footerLinks{gap:12px;display:flex}@media (max-width:900px){.layout{grid-template-columns:1fr}.sidebar{order:2}}