*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#4f46e5;--primary-hover:#4338ca;--primary-light:#eef2ff;--success:#16a34a;--success-light:#dcfce7;--danger:#dc2626;--danger-light:#fee2e2;--warning:#f59e0b;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--radius:12px;--shadow:0 1px 3px #0000001a, 0 1px 2px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--safe-top:env(safe-area-inset-top);--safe-bottom:env(safe-area-inset-bottom);--safe-left:env(safe-area-inset-left);--safe-right:env(safe-area-inset-right);color:var(--gray-800);background:var(--gray-50);-webkit-tap-highlight-color:transparent;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans SC,sans-serif;font-size:16px;line-height:1.6}body{overscroll-behavior:none;min-height:100svh}#root{max-width:900px;margin:0 auto}@media (width<=600px){:root{--radius:8px}#root{padding:0}}.app-root{height:100vh;padding-top:var(--safe-top);padding-bottom:var(--safe-bottom);padding-left:var(--safe-left);padding-right:var(--safe-right);flex-direction:column;display:flex}.app-body{-webkit-overflow-scrolling:touch;flex:1;overflow-y:auto}.subject-header{background:var(--gray-200);border-bottom:1px solid var(--gray-200);-webkit-overflow-scrolling:touch;z-index:20;scrollbar-width:none;flex-shrink:0;gap:1px;display:flex;position:sticky;top:0;overflow:auto hidden}.subject-header::-webkit-scrollbar{display:none}.subject-card{cursor:pointer;text-align:center;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;background:#fff;border:none;flex-direction:column;flex:none;justify-content:center;align-items:center;gap:2px;min-width:80px;max-width:140px;padding:10px;transition:all .15s;display:flex}.subject-card:active{transform:scale(.96)}.subject-card:hover{background:var(--primary-light)}.subject-card.active{background:var(--primary)}.subject-card.active .subject-name{color:#fff}.subject-card.active .subject-count{color:#ffffffbf}.subject-name{color:var(--gray-800);white-space:nowrap;text-overflow:ellipsis;max-width:100%;font-size:12px;font-weight:600;line-height:1.3;overflow:hidden}.subject-count{color:var(--gray-400);white-space:nowrap;font-size:10px}.empty-state{min-height:40vh;color:var(--gray-400);justify-content:center;align-items:center;font-size:1.1rem;display:flex}.quiz-content{max-width:800px;margin:0 auto;padding:12px 16px 24px}.type-section{margin-bottom:24px}.type-header{z-index:5;border-bottom:2px solid var(--gray-200);cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;background:#fff;align-items:center;gap:10px;margin-bottom:12px;padding:10px 0;display:flex;position:sticky;top:0}.collapse-arrow{color:var(--gray-400);flex-shrink:0;font-size:10px;transition:transform .2s}.collapse-arrow.expanded{transform:rotate(90deg)}.type-header-label{border-radius:6px;padding:3px 10px;font-size:13px;font-weight:700}.type-header-count{color:var(--gray-500);font-size:13px;font-weight:500}.question-card{border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;margin-bottom:12px;padding:20px}.question-header{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:12px;display:flex}.q-type-badge{border-radius:4px;padding:2px 10px;font-size:12px;font-weight:600;line-height:1.4}.q-number{color:var(--gray-500);font-size:13px}.q-warning{color:var(--warning);background:#fffbeb;border-radius:4px;padding:2px 8px;font-size:11px}.question-text{color:var(--gray-800);white-space:pre-wrap;word-break:break-word;margin-bottom:16px;font-size:1rem;line-height:1.7}.options-list{flex-direction:column;gap:8px;display:flex}.option-item{border:2px solid var(--gray-200);cursor:pointer;text-align:left;color:var(--gray-700);background:#fff;border-radius:10px;align-items:flex-start;gap:10px;width:100%;min-height:48px;padding:14px;font-size:.95rem;transition:all .15s;display:flex}.option-item:hover:not(:disabled),.option-item.selected{border-color:var(--primary);background:var(--primary-light)}.option-item.correct{border-color:var(--success);background:var(--success-light)}.option-item.wrong{border-color:var(--danger);background:var(--danger-light)}.option-item:disabled{cursor:default;opacity:.9}.option-radio{flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;margin-top:2px;display:flex}.radio{border:2px solid var(--gray-300);border-radius:50%;justify-content:center;align-items:center;width:22px;height:22px;transition:all .15s;display:flex}.radio.checked{border-color:var(--primary);background:var(--primary);box-shadow:inset 0 0 0 4px #fff}.checkbox{border:2px solid var(--gray-300);color:#fff;border-radius:4px;justify-content:center;align-items:center;width:22px;height:22px;font-size:13px;font-weight:700;transition:all .15s;display:flex}.checkbox.checked{border-color:var(--primary);background:var(--primary)}.option-letter{color:var(--gray-500);flex-shrink:0;min-width:18px;margin-top:2px;font-weight:600}.option-text{word-break:break-word;flex:1;line-height:1.6}.mark{flex-shrink:0;margin-top:2px;font-size:16px;font-weight:700}.correct-mark{color:var(--success)}.wrong-mark{color:var(--danger)}.single-option{border-color:var(--success);cursor:default;background:#f0fdf4}.feedback{border-radius:8px;margin-top:12px;padding:10px 14px;font-size:13px;line-height:1.5}.feedback.correct{background:var(--success-light);color:#15803d}.feedback.wrong{background:var(--danger-light);color:#b91c1c}.feedback.hint{color:#166534;background:#f0fdf4;border:1px dashed #86efac}.progress-summary{align-items:center;gap:12px;margin-bottom:8px;padding:10px 0;display:flex}.progress-bar{background:var(--gray-200);border-radius:3px;flex:1;height:6px;overflow:hidden}.progress-fill{background:var(--primary);border-radius:3px;height:100%;transition:width .3s}.progress-text{color:var(--gray-500);white-space:nowrap;flex-shrink:0;font-size:13px}.progress-correct{color:var(--success);font-weight:500}.answer-status{white-space:nowrap;border-radius:4px;margin-left:auto;padding:2px 10px;font-size:12px;font-weight:600}.answer-status.correct{background:var(--success-light);color:var(--success)}.answer-status.wrong{background:var(--danger-light);color:var(--danger)}.btn{border:2px solid var(--gray-200);cursor:pointer;color:var(--gray-600);white-space:nowrap;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;background:#fff;border-radius:8px;padding:10px 20px;font-size:14px;font-weight:500;transition:all .15s}.btn:active:not(:disabled){transform:scale(.96)}.btn:hover:not(:disabled){border-color:var(--gray-300);background:var(--gray-50)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-ghost{border-color:#0000}.btn-ghost:hover{background:var(--gray-100)}.btn-primary{border-color:var(--primary);background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover);border-color:var(--primary-hover)}.btn-large{padding:12px 28px;font-size:15px}.loading-screen{min-height:60svh;color:var(--gray-500);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner{border:4px solid var(--gray-200);border-top-color:var(--primary);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=480px){.subject-card{min-width:72px;max-width:120px;padding:10px 8px}.subject-name{font-size:11px}.subject-count{font-size:10px}.quiz-content{padding:10px 12px 20px}.progress-summary{flex-direction:column;gap:6px;padding:8px 0}.progress-text{font-size:12px}.question-card{border-radius:calc(var(--radius) - 2px);padding:16px}.question-text{font-size:.95rem;line-height:1.6}.option-item{border-radius:8px;min-height:44px;padding:12px;font-size:.9rem}.type-header{margin-bottom:10px;padding:8px 0}.type-section{margin-bottom:20px}.type-header-label{padding:3px 8px;font-size:12px}}@media (width<=360px){.subject-card{min-width:64px;max-width:100px;padding:8px 6px}.question-card{padding:14px}.option-item{gap:8px;padding:10px}}@media (width>=601px){.subject-header{border-bottom:1px solid var(--gray-200);background:#fff;flex-wrap:wrap;justify-content:center;gap:8px;padding:10px 16px;overflow:visible}.subject-card{border:1px solid var(--gray-200);border-radius:8px;gap:4px;min-width:100px;max-width:180px;padding:12px 16px}.subject-card:hover,.subject-card.active{border-color:var(--primary)}}