@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#1e40af;--primary-light:#3b82f6;--primary-dark:#1e3a8a;--accent:#0ea5e9;--success:#10b981;--success-light:#d1fae5;--error:#ef4444;--error-light:#fee2e2;--warning:#f59e0b;--bg:#f0f4ff;--surface:#fff;--surface2:#f8fafc;--border:#e2e8f0;--text:#0f172a;--text-muted:#64748b;--text-light:#94a3b8;--radius:16px;--radius-sm:10px;--shadow:0 4px 24px #1e40af1a;--shadow-lg:0 8px 40px #1e40af29}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:Inter,system-ui,sans-serif;line-height:1.6}#root{flex-direction:column;min-height:100vh;display:flex}.center-wrap{justify-content:center;align-items:center;min-height:100vh;padding:24px 16px;display:flex}.quiz-layout{width:100%;max-width:720px;margin:0 auto;padding:32px 16px 48px}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);border:1px solid var(--border)}.start-card{text-align:center;width:100%;max-width:520px;padding:48px 40px}.start-icon{filter:drop-shadow(0 4px 8px #1e40af33);margin-bottom:20px;font-size:64px}.start-title{color:var(--primary-dark);margin-bottom:12px;font-size:28px;font-weight:800;line-height:1.2}.start-subtitle{color:var(--text-muted);margin-bottom:32px;font-size:15px;line-height:1.7}.start-meta{flex-wrap:wrap;justify-content:center;gap:24px;margin-bottom:36px;display:flex}.meta-item{color:var(--text-muted);background:var(--bg);border:1px solid var(--border);border-radius:50px;align-items:center;gap:6px;padding:8px 16px;font-size:14px;display:flex}.meta-icon{font-size:16px}.btn-primary{background:linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;width:100%;padding:14px 28px;font-family:inherit;font-size:15px;font-weight:600;transition:all .2s;display:inline-flex;box-shadow:0 4px 14px #1e40af4d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #1e40af66}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--surface);color:var(--primary);border:2px solid var(--primary-light);border-radius:var(--radius-sm);cursor:pointer;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-family:inherit;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.btn-secondary:hover{background:#eff6ff}.progress-wrap{margin-bottom:20px}.progress-labels{color:var(--text-muted);justify-content:space-between;margin-bottom:8px;font-size:13px;font-weight:600;display:flex}.progress-track{background:var(--border);border-radius:50px;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);border-radius:50px;height:100%;transition:width .4s}.question-card{padding:36px 40px}.question-badge{color:var(--primary);letter-spacing:.05em;text-transform:uppercase;background:#eff6ff;border-radius:50px;margin-bottom:16px;padding:4px 12px;font-size:12px;font-weight:700;display:inline-block}.question-text{color:var(--text);margin-bottom:28px;font-size:19px;font-weight:700;line-height:1.5}.options-list{flex-direction:column;gap:12px;margin-bottom:24px;display:flex}.option{text-align:left;background:var(--surface2);border:2px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text);cursor:pointer;align-items:flex-start;gap:14px;padding:14px 18px;font-family:inherit;font-size:15px;transition:all .18s;display:flex}.option:hover:not(:disabled){border-color:var(--primary-light);background:#eff6ff;transform:translate(3px)}.option-letter{background:var(--border);width:28px;height:28px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:700;transition:all .18s;display:flex}.option-text{flex:1;line-height:1.5}.option-icon{flex-shrink:0;font-size:18px;font-weight:700}.option-selected{border-color:var(--primary-light);background:#eff6ff}.option-selected .option-letter{background:var(--primary);color:#fff}.option-correct{border-color:var(--success);background:var(--success-light)}.option-correct .option-letter{background:var(--success);color:#fff}.option-wrong{border-color:var(--error);background:var(--error-light)}.option-wrong .option-letter{background:var(--error);color:#fff}.option-disabled{opacity:.5;cursor:not-allowed}.feedback-box{border-radius:var(--radius-sm);gap:14px;margin-bottom:24px;padding:16px 20px;font-size:14px;line-height:1.6;animation:.3s slideDown;display:flex}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.feedback-correct{background:var(--success-light);color:#065f46;border:1px solid #6ee7b7}.feedback-wrong{background:var(--error-light);color:#7f1d1d;border:1px solid #fca5a5}.feedback-icon{flex-shrink:0;margin-top:2px;font-size:20px}.feedback-box strong{margin-bottom:4px;font-size:15px;display:block}.nav-buttons{align-items:center;gap:12px;display:flex}.nav-buttons .btn-primary{width:auto;min-width:200px}.result-card{text-align:center;width:100%;max-width:600px;padding:48px 40px}.result-emoji{filter:drop-shadow(0 4px 12px #1e40af33);margin-bottom:16px;font-size:72px}.result-title{color:var(--primary-dark);margin-bottom:28px;font-size:26px;font-weight:800}.score-circle-wrap{flex-direction:column;align-items:center;margin-bottom:20px;display:flex}.score-circle{background:conic-gradient(var(--score-color) 0%, #e2e8f0 0%);width:120px;height:120px;box-shadow:0 0 0 8px white, 0 0 0 10px var(--border);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;margin-bottom:12px;display:flex}.score-number{color:var(--text);font-size:38px;font-weight:800;line-height:1}.score-total{color:var(--text-muted);font-size:14px;font-weight:600}.score-pct{font-size:32px;font-weight:800}.level-badge{border-radius:50px;margin-bottom:28px;padding:8px 24px;font-size:15px;font-weight:700;display:inline-block}.result-stats{justify-content:center;gap:20px;margin-bottom:32px;display:flex}.stat-item{border-radius:var(--radius-sm);border:2px solid #0000;flex:1;max-width:160px;padding:20px 16px}.stat-correct{background:var(--success-light);border-color:#6ee7b7}.stat-wrong{background:var(--error-light);border-color:#fca5a5}.stat-num{margin-bottom:6px;font-size:36px;font-weight:800;line-height:1;display:block}.stat-correct .stat-num{color:var(--success)}.stat-wrong .stat-num{color:var(--error)}.stat-label{color:var(--text-muted);font-size:13px;font-weight:600}.result-actions{flex-direction:column;gap:12px;display:flex}.result-actions .btn-primary,.result-actions .btn-secondary{width:100%}.review-section{text-align:left;border-top:2px solid var(--border);margin-top:36px;padding-top:28px}.review-title{color:var(--primary-dark);margin-bottom:20px;font-size:18px;font-weight:700}.review-item{border-radius:var(--radius-sm);border:1px solid #0000;margin-bottom:12px;padding:16px 18px}.review-correct{background:#f0fdf4;border-color:#bbf7d0}.review-wrong{background:#fff7ed;border-color:#fed7aa}.review-header{align-items:flex-start;gap:10px;margin-bottom:10px;display:flex}.review-icon{flex-shrink:0;margin-top:2px;font-size:16px}.review-qnum{color:var(--text-muted);background:var(--border);border-radius:4px;flex-shrink:0;margin-top:2px;padding:2px 8px;font-size:12px;font-weight:700}.review-qtext{color:var(--text);font-size:14px;font-weight:600;line-height:1.4}.review-answers{flex-direction:column;gap:6px;margin:8px 0 10px 26px;font-size:13px;display:flex}.review-user,.review-good{flex-direction:column;gap:2px;display:flex}.review-user>span:first-child,.review-good>span:first-child{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:600}.wrong-answer{color:var(--error);font-weight:600}.correct-answer{color:var(--success);font-weight:600}.review-expl{color:var(--text-muted);margin-left:26px;font-size:13px;font-style:italic;line-height:1.6}@media (width<=600px){.question-card{padding:24px 20px}.start-card,.result-card{padding:32px 24px}.question-text{font-size:16px}.option{padding:12px 14px;font-size:14px}.start-meta{gap:10px}.nav-buttons{flex-direction:column-reverse}.nav-buttons .btn-primary,.nav-buttons .btn-secondary{width:100%}.result-stats{gap:12px}}