*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4a90d9;--primary-dark: #357abd;--success-color: #52c41a;--error-color: #ff4d4f;--warning-color: #faad14;--bg-color: #f5f7fa;--card-bg: #ffffff;--text-primary: #1f2937;--text-secondary: #6b7280;--border-color: #e5e7eb;--shadow: 0 2px 8px rgba(0, 0, 0, .08);--shadow-hover: 0 4px 16px rgba(0, 0, 0, .12)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background-color:var(--bg-color);color:var(--text-primary);line-height:1.6}#app{min-height:100vh}.header{background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff;padding:2rem 1rem;text-align:center;box-shadow:var(--shadow)}.header h1{font-size:1.75rem;font-weight:600;margin-bottom:.5rem}.header p{opacity:.9;font-size:.95rem}.container{max-width:1200px;margin:0 auto;padding:2rem 1rem}.back-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:#fff;border:1px solid var(--border-color);border-radius:8px;color:var(--text-primary);cursor:pointer;font-size:.9rem;transition:all .2s;margin-bottom:1.5rem}.back-btn:hover{background:var(--bg-color);border-color:var(--primary-color);color:var(--primary-color)}.quiz-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}.quiz-card{background:var(--card-bg);border-radius:12px;padding:1.5rem;box-shadow:var(--shadow);cursor:pointer;transition:all .3s ease;border:2px solid transparent}.quiz-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--primary-color)}.quiz-card h3{font-size:1.1rem;color:var(--text-primary);margin-bottom:.75rem;line-height:1.5}.quiz-meta{display:flex;flex-wrap:wrap;gap:.5rem}.quiz-tag{display:inline-block;padding:.25rem .75rem;background:var(--bg-color);border-radius:20px;font-size:.8rem;color:var(--text-secondary)}.quiz-tag.fill{background:#e6f7ff;color:#1890ff}.quiz-tag.choice{background:#f6ffed;color:#52c41a}.quiz-tag.judge{background:#fff7e6;color:#fa8c16}.quiz-detail{background:var(--card-bg);border-radius:12px;padding:2rem;box-shadow:var(--shadow)}.quiz-detail h2{font-size:1.5rem;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:2px solid var(--border-color)}.section{margin-bottom:2.5rem}.section-title{font-size:1.2rem;color:var(--primary-color);margin-bottom:1.5rem;padding:.75rem 1rem;background:var(--bg-color);border-radius:8px;border-left:4px solid var(--primary-color)}.question{margin-bottom:1.5rem;padding:1.25rem;background:#fafafa;border-radius:8px;border:1px solid var(--border-color)}.question-number{display:inline-block;width:28px;height:28px;line-height:28px;text-align:center;background:var(--primary-color);color:#fff;border-radius:50%;font-size:.85rem;font-weight:600;margin-right:.75rem}.question-text{font-size:1rem;color:var(--text-primary);margin-bottom:1rem;line-height:1.7}.fill-blank{display:inline-block;min-width:100px;padding:.4rem .75rem;background:#fff;border:2px dashed var(--border-color);border-radius:6px;cursor:pointer;transition:all .2s;color:var(--text-secondary);font-size:.9rem;text-align:center}.fill-blank:hover{border-color:var(--primary-color);background:#f0f7ff}.fill-blank.revealed{border-style:solid;border-color:var(--success-color);background:#f6ffed;color:var(--success-color);font-weight:500}.options{display:flex;flex-direction:column;gap:.75rem}.option{display:flex;align-items:flex-start;gap:.75rem;padding:.875rem 1rem;background:#fff;border:2px solid var(--border-color);border-radius:8px;cursor:pointer;transition:all .2s}.option:hover{border-color:var(--primary-color);background:#f0f7ff}.option-key{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--bg-color);border-radius:6px;font-weight:600;color:var(--text-secondary);flex-shrink:0}.option-text{flex:1;font-size:.95rem}.option.correct{border-color:var(--success-color);background:#f6ffed}.option.correct .option-key{background:var(--success-color);color:#fff}.option.wrong{border-color:var(--error-color);background:#fff2f0}.option.wrong .option-key{background:var(--error-color);color:#fff}.option.selected{border-color:var(--primary-color);background:#e6f7ff}.judge-buttons{display:flex;gap:1rem}.judge-btn{padding:.625rem 2rem;border:2px solid var(--border-color);background:#fff;border-radius:8px;cursor:pointer;font-size:1rem;transition:all .2s;font-weight:500}.judge-btn:hover{border-color:var(--primary-color);background:#f0f7ff}.judge-btn.correct{border-color:var(--success-color);background:#f6ffed;color:var(--success-color)}.judge-btn.wrong{border-color:var(--error-color);background:#fff2f0;color:var(--error-color)}.judge-btn.selected-correct{border-color:var(--success-color);background:var(--success-color);color:#fff}.judge-btn.selected-wrong{border-color:var(--error-color);background:var(--error-color);color:#fff}.result-indicator{display:inline-flex;align-items:center;gap:.5rem;margin-left:1rem;font-size:.9rem;font-weight:500}.result-indicator.correct{color:var(--success-color)}.result-indicator.wrong{color:var(--error-color)}.empty-state{text-align:center;padding:4rem 2rem;color:var(--text-secondary)}.empty-state h3{font-size:1.25rem;margin-bottom:.5rem;color:var(--text-primary)}.loading{text-align:center;padding:4rem;color:var(--text-secondary)}.spinner{display:inline-block;width:40px;height:40px;border:3px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:1rem}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.header h1{font-size:1.4rem}.quiz-grid{grid-template-columns:1fr}.quiz-detail,.question{padding:1rem}}