*{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100vh;background:#f5f7fa;color:#1f2937;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer}.app{max-width:720px;margin:0 auto;padding:16px 16px 80px}.app h1{font-size:22px;margin:4px 0 16px}.app h2{font-size:18px;margin:12px 0}.card{background:#fff;border-radius:12px;padding:16px;box-shadow:0 1px 2px #0000000f;margin-bottom:12px}.btn{display:block;width:100%;padding:14px 16px;border-radius:10px;border:none;background:#1d4ed8;color:#fff;font-size:16px;font-weight:600;margin-bottom:10px;text-align:center}.btn.secondary{background:#475569}.btn.muted{background:#e5e7eb;color:#1f2937}.btn.warn{background:#b45309}.btn.danger{background:#b91c1c}.btn.success{background:#15803d}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.small{padding:10px 12px;font-size:14px;display:inline-block;width:auto;margin-right:8px}.btn.action{display:flex;align-items:center;text-align:left;gap:12px;padding:14px 16px}.btn.action .step{flex:0 0 32px;height:32px;border-radius:50%;background:#ffffff38;color:#fff;font-weight:700;font-size:16px;display:flex;align-items:center;justify-content:center}.btn.action .content{display:flex;flex-direction:column;flex:1;min-width:0}.btn.action .title{font-size:16px;font-weight:600}.btn.action .subtitle{font-size:12px;font-weight:400;opacity:.85;margin-top:2px;line-height:1.3}.btn.action:disabled .step{background:#0000001f}.link-btn{background:transparent;border:none;color:#475569;font-size:13px;font-weight:500;padding:6px 4px;text-decoration:underline;cursor:pointer}.link-btn:hover{color:#1d4ed8}.link-sep{color:#cbd5e1;align-self:center}.option{display:block;width:100%;text-align:left;padding:14px 16px;border-radius:10px;border:2px solid #e5e7eb;background:#fff;font-size:15px;color:#1f2937;margin-bottom:8px;line-height:1.4}.option:hover{border-color:#93c5fd}.option.correct{border-color:#16a34a;background:#dcfce7}.option.wrong{border-color:#dc2626;background:#fee2e2}.option.disabled{cursor:default}.option .letter{font-weight:700;margin-right:8px}.feedback{padding:12px;border-radius:8px;margin:12px 0}.feedback.correct{background:#dcfce7;color:#166534}.feedback.wrong{background:#fee2e2;color:#991b1b}.muted-text{color:#6b7280;font-size:14px}.progress-bar{background:#e5e7eb;border-radius:999px;height:8px;overflow:hidden;margin:8px 0 12px}.progress-bar>div{background:#1d4ed8;height:100%}.row{display:flex;gap:8px;flex-wrap:wrap}.row .btn{flex:1}.tag{display:inline-block;font-size:11px;font-weight:600;padding:2px 8px;border-radius:999px;background:#e0f2fe;color:#075985;margin-right:6px;text-transform:uppercase;letter-spacing:.3px}.tag.warn{background:#fef3c7;color:#92400e}.tag.p1{background:#dcfce7;color:#166534}.tag.p2{background:#e0f2fe;color:#075985}.tag.p3{background:#f1f5f9;color:#475569}.block-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid #f1f5f9;gap:12px}.block-row:last-child{border-bottom:none}.block-row .name{font-size:14px;flex:1}.block-row .stats{font-size:13px;color:#6b7280;white-space:nowrap}.exam-grade{text-align:center;padding:24px}.exam-grade .grade{font-size:56px;font-weight:800}.exam-grade .pass{color:#15803d}.exam-grade .fail{color:#b91c1c}.review-list{padding-left:0;list-style:none}.review-item{padding:12px;border-radius:8px;background:#f8fafc;margin-bottom:8px;font-size:14px}.review-item.correct{border-left:4px solid #16a34a}.review-item.wrong{border-left:4px solid #dc2626}