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p{margin:0;font-size:14px;color:var(--text-medium)}.answer-section{display:flex;flex-direction:column;gap:16px}.answer-card,.calculation-card{background:var(--bg-card);border-radius:var(--radius-md);padding:18px;border:1px solid rgba(255,255,255,.5);box-shadow:var(--shadow-xs)}.answer-card h4,.calculation-card h4{font-size:14px;color:var(--text-dark);margin:0 0 12px}.answer-card textarea,.calculation-card textarea{width:100%;padding:12px;border:1px solid var(--border-light);border-radius:var(--radius-sm);font-size:14px;font-family:inherit;resize:vertical;transition:all .15s}.answer-card textarea:focus,.calculation-card textarea:focus{border-color:var(--primary);outline:none}.answer-card textarea:disabled,.calculation-card textarea:disabled{background:var(--bg-warm);cursor:not-allowed}.submit-answer-btn{padding:12px 28px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-full);font-size:15px;font-weight:600;cursor:pointer;transition:all 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8px}.key-points{padding:12px 14px;background:#0071e30d;border-radius:var(--radius-sm);font-size:13px}.key-points strong{color:var(--primary);margin-right:8px}.analysis-locked{position:relative}.blur-content{filter:blur(6px);-webkit-user-select:none;user-select:none;padding:16px;font-size:14px;line-height:1.8}.unlock-prompt{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;background:#fff;padding:20px 28px;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.unlock-prompt p{margin:0 0 14px;font-size:13px;color:var(--text-medium)}.unlock-prompt .unlock-btn{padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-full);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.unlock-prompt .unlock-btn:hover{background:var(--primary-dark)}.question-sidebar{width:300px;display:flex;flex-direction:column;gap:16px;flex-shrink:0}.tool-card{background:#fff;border-radius:var(--radius-md);padding:18px;border:1px solid var(--border-light)}.tool-card h4{font-size:14px;margin:0 0 12px;color:var(--text-dark)}.lab-entry{text-align:center;background:#0071e30a;border-color:#0071e31f}.lab-entry .tool-icon{font-size:36px;margin-bottom:8px}.lab-entry p{font-size:13px;color:var(--text-medium);margin:0 0 16px}.open-lab-btn{width:100%;padding:10px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:13px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.formula-card .formula-list{display:flex;flex-direction:column;gap:10px}.formula-item{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:var(--bg-warm);border-radius:8px}.formula-item .formula{font-family:JetBrains 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30px}.qv-main{flex:1;display:flex;flex-direction:column;gap:20px}.qv-question-card{padding:24px;background:var(--bg-card);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);animation:fadeInUp .4s var(--ease-out)}.card-label{margin-bottom:12px;color:var(--text-light);font-weight:600}.question-text{margin:0 0 16px;font-size:1.05rem;line-height:1.7;color:var(--text-dark)}.task-box{padding:16px;background:#0071e30a;border-radius:10px;border-left:4px solid #3b82f6}.task-box strong{color:var(--primary)}.task-box p{margin:8px 0 0;color:var(--primary)}.hint-box{margin-top:12px;padding:12px 16px;background:#0071e30f;border-radius:8px;font-size:.9rem}.hint-box strong{color:var(--text-medium)}.hint-box span{color:var(--text-light)}.qv-answer-section{padding:24px;background:var(--bg-card);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.answer-input-group{margin-bottom:16px}.answer-input-group label{display:block;margin-bottom:8px;color:var(--text-medium);font-weight:600}.answer-input-group textarea{width:100%;padding:12px;border:1px solid var(--border-light);border-radius:10px;font-size:.95rem;resize:vertical}.answer-input-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px #0071e31f}.submit-btn{width:100%;padding:12px;background:var(--primary);border:none;border-radius:var(--radius-sm);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.submit-btn:hover{background:var(--primary-dark)}.submitted-tag{text-align:center;padding:12px;background:#34c75914;border-radius:var(--radius-sm);color:var(--success);font-weight:600}.qv-analysis{padding:24px;background:var(--bg-card);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.analysis-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.analysis-header h4{margin:0;color:var(--text-dark)}.vip-lock{padding:4px 10px;background:#0071e30f;border-radius:12px;color:var(--text-medium);font-size:.8rem}.correct-answer{padding:14px;background:#34c75914;border-radius:var(--radius-sm);margin-bottom:14px}.correct-answer strong{color:var(--success)}.answer-text{margin-left:8px;color:var(--success);font-weight:600}.analysis-steps{margin-bottom:16px}.analysis-steps ol{margin:8px 0 0 20px;color:var(--text-medium);line-height:1.8}.key-points-box{padding:12px 16px;background:var(--bg-inset);border-radius:8px}.key-points-box strong{color:var(--text-medium)}.key-points-box span{color:var(--text-light)}.analysis-locked{text-align:center;padding:30px}.blur-text{margin-bottom:16px;color:#d1d5db;filter:blur(4px);-webkit-user-select:none;user-select:none}.unlock-btn{padding:10px 24px;background:var(--primary);border:none;border-radius:var(--radius-full);color:#fff;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.unlock-btn:hover{background:var(--primary-dark)}.qv-sidebar{width:300px;display:flex;flex-direction:column;gap:16px}.tool-card{padding:20px;background:var(--bg-card);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);transition:all var(--dur-normal) var(--ease-out)}.tool-card:hover{box-shadow:var(--shadow-soft)}.tool-card h4{margin:0 0 12px;color:var(--text-dark)}.lab-card{text-align:center;background:#0071e308;border:1px solid rgba(0,113,227,.1)}.tool-icon{font-size:2.5rem;margin-bottom:8px}.lab-card p{margin:0 0 16px;color:var(--text-light)}.open-lab-btn{width:100%;padding:10px;background:var(--primary);border:none;border-radius:var(--radius-sm);color:#fff;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.open-lab-btn:hover{background:var(--primary-dark)}.formula-list{display:flex;flex-direction:column;gap:10px}.formula-row{display:flex;justify-content:space-between;align-items:center;padding:8px;background:var(--bg-warm);border-radius:8px}.formula-row code{font-family:JetBrains Mono,monospace;color:var(--primary);font-size:.85rem}.formula-row span{color:var(--text-light);font-size:.8rem}.tips-card ul{margin:0;padding-left:20px;color:var(--text-light);line-height:1.8}.tips-card li{margin-bottom:4px}@media (max-width: 1024px){.sections-grid{grid-template-columns:1fr}.features-row{grid-template-columns:repeat(2,1fr)}.qv-body{flex-direction:column}.qv-sidebar{width:100%;flex-direction:row;flex-wrap:wrap}.qv-sidebar .tool-card{flex:1;min-width:200px}}.auth-page{padding:20px;min-height:calc(100vh - 64px);display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,var(--bg-warm) 0%,#e8e7ee 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#fecaca;border-radius:8px;color:var(--danger);font-size:13px;margin-bottom:16px}.auth-form{display:flex;flex-direction:column;gap:16px}.auth-form label{font-size:14px;color:var(--text-medium);display:flex;flex-direction:column;gap:6px}.auth-form input{padding:11px 14px;border:1px solid var(--border-light);border-radius:var(--radius-sm);font-size:14px;transition:all .15s}.auth-form input:focus{border-color:var(--primary);outline:none}.auth-submit{padding:12px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-full);font-size:15px;font-weight:600;cursor:pointer;margin-top:8px;transition:all var(--dur-fast)}.auth-submit:hover{background:var(--primary-dark)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-footer{display:flex;justify-content:space-between;margin-top:24px;padding-top:20px;border-top:1px solid var(--border-soft)}.auth-back,.auth-logout{padding:10px 16px;border:1px solid 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