:root{color:#172033;--color-text:#172033;--color-muted:#64748b;--color-panel:#fff;--color-border:#d9deea;--color-soft-border:#cfd6e6;--color-soft-bg:#f4f6fb;--color-selected-bg:#eef2ff;--color-selected-border:#334155;--color-correct-border:#1f883d;--color-correct-bg:#dafbe1;--color-correct-text:#116329;--color-incorrect-border:#cf222e;--color-incorrect-bg:#ffebe9;--color-incorrect-text:#a40e26;--focus-ring:0 0 0 3px #3341553d;background:#f7f8fb;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}button{font:inherit}button:focus-visible{box-shadow:var(--focus-ring);outline:none}.app-shell{max-width:880px;margin:0 auto;padding:32px 20px}.app-header{margin-bottom:24px}.app-header h1{margin:0 0 8px;font-size:2rem}.app-header p{color:#4b5565;margin:0}.panel{background:var(--color-panel);border:1px solid var(--color-border);border-radius:16px;padding:24px;box-shadow:0 10px 30px #0f172a0f}.meta-row{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.badge{border:1px solid var(--color-soft-border);color:#32415f;background:var(--color-soft-bg);border-radius:999px;padding:4px 10px;font-size:.85rem;display:inline-flex}.question-text{white-space:pre-wrap;font-size:1.1rem;line-height:1.7}.options{gap:12px;margin:20px 0;display:grid}.option-button{text-align:left;border:1px solid var(--color-soft-border);width:100%;color:var(--color-text);cursor:pointer;background:#fff;border-radius:12px;align-items:center;gap:.5rem;padding:14px 16px;display:flex}.option-button:not(:disabled):hover{background:var(--color-soft-bg)}.option-button:disabled{cursor:default;opacity:1}.option-button.selected{border-color:var(--color-selected-border);background:var(--color-selected-bg)}.option-button.correct{border-color:var(--color-correct-border);background:var(--color-correct-bg)}.option-button.incorrect{border-color:var(--color-incorrect-border);background:var(--color-incorrect-bg)}.option-button.correct,.option-button.incorrect{font-weight:600}.option-status{white-space:nowrap;margin-left:auto;font-weight:700}.option-button.correct .option-status{color:var(--color-correct-text)}.option-button.incorrect .option-status{color:var(--color-incorrect-text)}.feedback{border:1px solid var(--color-border);background:#f8fafc;border-radius:12px;margin-top:16px;padding:16px}.feedback h3{margin-top:0}.feedback--correct{border-color:var(--color-correct-border);background:var(--color-correct-bg);color:var(--color-correct-text)}.feedback--incorrect{border-color:var(--color-incorrect-border);background:var(--color-incorrect-bg);color:var(--color-incorrect-text)}.feedback--correct .muted,.feedback--incorrect .muted{color:currentColor;opacity:.78}.actions{gap:12px;margin-top:20px;display:flex}.primary-button{color:#fff;cursor:pointer;background:#172033;border:0;border-radius:12px;padding:12px 16px}.primary-button:disabled{cursor:not-allowed;opacity:.55}.secondary-button{border:1px solid var(--color-soft-border);color:#172033;cursor:pointer;background:#fff;border-radius:12px;padding:12px 16px}.secondary-button:disabled{cursor:not-allowed;opacity:.55}.muted{color:var(--color-muted)}.error{color:#991b1b}@media (width<=640px){.app-shell{padding:24px 14px}.panel{padding:18px}.option-button{align-items:flex-start}.option-status{margin-left:0}}