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h1{font-size:28px;color:var(--text-dark);margin-bottom:6px;letter-spacing:-.02em;font-weight:700}.vip-hub-header p{color:var(--text-light);font-size:14px}.back-btn{background:#0000000a;border:none;padding:7px 16px;border-radius:var(--radius-full);cursor:pointer;font-size:13px;font-weight:500;color:var(--text-medium);margin-bottom:16px;transition:all var(--dur-fast) var(--ease-out)}.back-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translate(-2px)}.vip-promo-banner{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-lg);padding:18px 24px;margin-bottom:24px;box-shadow:var(--shadow-card)}.promo-content{display:flex;align-items:center;gap:16px}.promo-icon{font-size:32px}.promo-text h3{font-size:16px;color:var(--text-dark);margin-bottom:3px;font-weight:600}.promo-text p{font-size:13px;color:var(--text-light)}.promo-text strong{font-size:18px;color:var(--primary)}.promo-btn{margin-left:auto;background:var(--primary);color:#fff;border:none;padding:10px 22px;border-radius:var(--radius-full);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.exam-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin-bottom:32px}.exam-hub-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:22px;border:1px solid rgba(255,255,255,.5);position:relative;transition:all var(--dur-normal) var(--ease-out);cursor:pointer;box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);animation:fadeInUp .4s var(--ease-out) both}.exam-hub-card:nth-child(2){animation-delay:.05s}.exam-hub-card:nth-child(3){animation-delay:.1s}.exam-hub-card:nth-child(4){animation-delay:.15s}.exam-hub-card:hover:not(.locked){transform:translateY(-3px) scale(1.01);box-shadow:var(--shadow-card-hover);border-color:#fffc;background:var(--bg-card-hover)}.exam-hub-card.locked{opacity:.6;cursor:not-allowed}.lock-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#ffffffd9;border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;z-index:10;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.lock-icon{font-size:28px}.exam-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.exam-number{background:var(--primary);color:#fff;padding:3px 8px;border-radius:6px;font-size:11px;font-weight:600}.points-badge{background:#0071e314;color:var(--primary);padding:3px 8px;border-radius:6px;font-size:11px;font-weight:600}.exam-title{font-size:16px;font-weight:600;color:var(--text-dark);margin-bottom:8px}.exam-difficulty{font-size:12px;color:var(--text-light);margin-bottom:6px}.stars{color:var(--accent)}.exam-desc{font-size:13px;color:var(--text-medium);line-height:1.6;margin-bottom:10px}.exam-task{background:#0071e30d;padding:10px 12px;border-radius:var(--radius-sm);font-size:12px;margin-bottom:14px}.task-label{font-weight:600;color:var(--primary)}.start-exam-btn{width:100%;padding:10px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.start-exam-btn:hover{background:var(--primary-dark)}.vip-features{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.5);border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-card)}.vip-features h2{text-align:center;font-size:20px;margin-bottom:20px;color:var(--text-dark);font-weight:600}.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.feature-item{text-align:center;padding:18px 12px;background:var(--bg-warm);border-radius:var(--radius-md);transition:transform var(--dur-fast)}.feature-item:hover{transform:translateY(-2px)}.feature-icon{font-size:28px;display:block;margin-bottom:10px}.feature-item h4{font-size:13px;color:var(--text-dark);margin-bottom:4px;font-weight:600}.feature-item p{font-size:11px;color:var(--text-light)}.circuit-builder-container{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg-warm)}.builder-header{display:flex;align-items:center;gap:16px;padding:14px 20px;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light)}.builder-header .exam-info{display:flex;align-items:center;gap:10px}.builder-header h2{font-size:16px;color:var(--text-dark);font-weight:600}.question-panel{background:#0071e30a;padding:16px 20px;border-bottom:1px solid var(--border-light)}.question-content h3{font-size:14px;color:var(--primary);margin-bottom:8px;font-weight:600}.question-content p{font-size:13px;color:var(--text-medium);line-height:1.6}.task-highlight{background:#fff;padding:10px 14px;border-radius:var(--radius-sm);margin-top:10px;font-size:13px;border-left:3px solid var(--primary)}.builder-main{flex:1;display:flex;overflow:hidden}.components-panel{width:200px;background:#fff9;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-right:1px solid rgba(0,0,0,.04);padding:14px;display:flex;flex-direction:column}.components-panel h3{font-size:13px;color:var(--text-dark);margin-bottom:10px;font-weight:600}.components-list{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.component-item{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg-inset);border-radius:var(--radius-sm);cursor:grab;border:1px solid transparent;transition:all .15s}.component-item:hover{border-color:var(--primary);background:#0071e30f}.component-item:active{cursor:grabbing}.comp-icon{font-size:20px}.comp-name{font-size:13px;color:var(--text-medium)}.tools-section{margin-top:auto}.tools-section h4{font-size:12px;color:var(--text-light);margin-bottom:10px}.tool-btn{width:100%;padding:9px;margin-bottom:6px;background:var(--bg-inset);border:none;border-radius:var(--radius-sm);font-size:13px;cursor:pointer;transition:all .15s;color:var(--text-medium)}.tool-btn:hover{background:#0071e314;color:var(--primary)}.tool-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.tool-btn.danger:hover{background:var(--danger);color:#fff;border-color:var(--danger)}.tool-btn.warning:hover{background:var(--warning);color:#fff;border-color:var(--warning)}.tool-btn:disabled{opacity:.4;cursor:not-allowed}.circuit-board{flex:1;position:relative;background:#ffffffd9;margin:12px;border-radius:var(--radius-md);border:1px solid rgba(0,0,0,.04);overflow:hidden;box-shadow:inset 0 1px 3px #00000005}.circuit-board.wire-mode{cursor:crosshair;border-color:var(--primary);box-shadow:var(--shadow-glow)}.board-grid{position:absolute;top:0;left:0;pointer-events:none}.board-placeholder{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:var(--text-light)}.board-placeholder p{margin:4px 0;font-size:14px}.placed-component{position:absolute;background:#fff;border:1.5px solid var(--border-light);border-radius:var(--radius-sm);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:move;transition:all .15s}.placed-component:hover{border-color:var(--primary);box-shadow:var(--shadow-soft)}.placed-component.selected{border-color:var(--primary);box-shadow:0 0 0 4px #0071e326}.placed-component .comp-icon{font-size:18px}.placed-component .comp-label{font-size:10px;color:var(--text-light);white-space:nowrap}.connection-point{position:absolute;width:8px;height:8px;background:#ef4444;border-radius:50%;opacity:0;transition:opacity .2s}.placed-component:hover .connection-point{opacity:1}.connection-point.left{left:-4px;top:50%;transform:translateY(-50%)}.connection-point.right{right:-4px;top:50%;transform:translateY(-50%)}.pulse-dot{animation:pulse 1s infinite}.action-panel{width:220px;background:#fff9;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-left:1px solid rgba(0,0,0,.04);padding:14px;display:flex;flex-direction:column}.action-panel h3{font-size:13px;color:var(--text-dark);margin-bottom:10px;font-weight:600}.circuit-stats{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:14px}.stat-item{background:var(--bg-inset);padding:10px;border-radius:var(--radius-sm);text-align:center}.stat-item span{font-size:10px;color:var(--text-muted);display:block;margin-bottom:3px}.stat-item strong{font-size:18px;color:var(--primary);font-weight:600}.placed-list{flex:1;overflow-y:auto}.placed-list h4{font-size:12px;color:var(--text-light);margin-bottom:8px}.placed-list ul{list-style:none;font-size:13px}.placed-list li{padding:6px 0;border-bottom:1px solid var(--border-soft)}.empty-hint{font-size:12px;color:var(--text-light)}.submit-section{margin-top:auto;padding-top:16px;border-top:1px solid var(--border-soft)}.submit-btn{width:100%;padding:12px;background:var(--success);color:#fff;border:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.submit-btn:hover{filter:brightness(1.08)}.submit-hint{text-align:center;font-size:11px;color:var(--text-light);margin-top:8px}@keyframes msgFadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--wood-light);border-radius:3px;transition:background .2s}::-webkit-scrollbar-thumb:hover{background:var(--wood-medium)}@media (max-width: 1200px){.features-grid{grid-template-columns:repeat(2,1fr)}.sidebar{width:280px}}@media (max-width: 768px){.features-grid,.exam-grid{grid-template-columns:1fr}}.tab-switcher-wrapper{display:flex;justify-content:center;margin-bottom:20px}.tab-switcher{display:flex;background:var(--bg-inset);border-radius:var(--radius-sm);padding:3px;border:none}.tab-switcher.large{padding:3px}.tab-btn{padding:8px 20px;border:none;background:transparent;border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;color:var(--text-muted);transition:all .18s;display:flex;align-items:center;gap:6px}.tab-btn:hover{color:var(--text-dark)}.tab-btn.active{background:#fff;color:var(--text-dark);box-shadow:var(--shadow-xs);font-weight:600}.vip-badge-small{background:var(--primary);color:#fff;padding:1px 5px;border-radius:4px;font-size:10px;font-weight:600}.vip-hub-container.full-height{display:flex;flex-direction:column;height:calc(100vh - 56px)}.vip-hub-header.compact{display:flex;align-items:center;gap:20px;padding:10px 20px;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light)}.lab-wrapper{flex:1;overflow:hidden}.feature-item.highlight{background:#0071e30f;border:1px solid rgba(0,113,227,.15)}.question-view-container{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg-warm)}.question-header{display:flex;align-items:center;gap:16px;padding:12px 20px;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light)}.question-meta{display:flex;align-items:center;gap:12px}.question-title{font-size:18px;font-weight:600;color:var(--text-dark)}.question-points{background:#0071e314;color:var(--primary);padding:3px 10px;border-radius:6px;font-size:12px;font-weight:600}.question-body{flex:1;display:flex;gap:24px;padding:24px;overflow:hidden}.question-main{flex:1;display:flex;flex-direction:column;gap:20px;overflow-y:auto}.question-content-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:22px;border:1px solid rgba(255,255,255,.5);box-shadow:var(--shadow-card)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.card-tag{font-size:14px;font-weight:600;color:var(--primary)}.difficulty{color:var(--accent);font-size:13px}.question-text{font-size:15px;line-height:1.8;color:var(--text-dark);margin-bottom:16px}.question-task-box{background:#0071e30a;border-left:3px solid var(--primary);padding:14px 16px;border-radius:0 var(--radius-sm) var(--radius-sm) 0}.question-task-box strong{color:var(--primary);display:block;margin-bottom:8px}.question-task-box 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 var(--dur-fast)}.submit-answer-btn:hover{background:var(--primary-dark)}.submitted-badge{padding:14px;background:#34c75914;border:1px solid rgba(52,199,89,.2);border-radius:var(--radius-md);text-align:center;font-size:14px;font-weight:600;color:var(--success)}.analysis-section{background:var(--bg-card);border-radius:var(--radius-lg);padding:20px;border:1px solid rgba(255,255,255,.5);box-shadow:var(--shadow-card)}.analysis-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.analysis-header h4{font-size:16px;margin:0;color:var(--text-dark)}.vip-lock{background:var(--primary);color:#fff;padding:3px 8px;border-radius:4px;font-size:11px;font-weight:600}.analysis-content{display:flex;flex-direction:column;gap:16px}.correct-answer{padding:16px;background:#22c55e1a;border-radius:10px;font-size:15px}.correct-answer strong{color:var(--success);margin-right:8px}.analysis-text{font-size:14px;line-height:1.8;color:var(--text-medium)}.analysis-text p{margin:0 0 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 Mono,monospace;font-size:13px;color:var(--primary);font-weight:600}.formula-item .desc{font-size:11px;color:var(--text-light)}.tips-card ul{margin:0;padding-left:20px}.tips-card li{font-size:13px;color:var(--text-medium);line-height:2}.vip-hub-main{flex:1;display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;background:var(--bg-warm);max-width:1200px;width:100%;margin:0 auto;padding:20px 28px 48px}.vip-benefits-slim{display:flex;align-items:center;justify-content:center;gap:6px;margin:20px auto 0;padding:10px 20px;max-width:560px;border-radius:20px;background:linear-gradient(135deg,#5856d614,#0071e314);border:1px solid rgba(88,86,214,.25);color:#5856d6;font-size:13px;font-weight:600}.vip-hero{display:flex;align-items:center;gap:24px;padding:20px 24px;background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-xl);box-shadow:var(--shadow-card)}.vip-hero .back-btn{padding:8px 16px;background:#0000000d;border:none;border-radius:var(--radius-full);color:var(--text-medium);cursor:pointer;font-size:13px;white-space:nowrap;transition:background var(--dur-fast) var(--ease-out)}.vip-hero .back-btn:hover{background:#0000001a}.vip-hero-title{display:flex;align-items:center;gap:14px;flex:1;min-width:0}.vip-hero-icon{display:flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,#0071e3,#4da3ff);color:#fff;flex-shrink:0;box-shadow:0 6px 16px #0071e347}.vip-hero-title h1{margin:0;font-size:1.4rem;font-weight:700;color:var(--text-dark);letter-spacing:-.02em;line-height:1.2}.vip-hero-title p{margin:2px 0 0;font-size:.85rem;color:var(--text-light)}.vip-status-badge{display:flex;align-items:center;gap:8px;padding:8px 16px;background:#34c7591a;border:1px solid rgba(52,199,89,.28);border-radius:var(--radius-full);color:#1d8a44;font-size:13px;font-weight:600;white-space:nowrap}.vip-status-badge em{font-style:normal;color:var(--text-light);font-weight:500}.vip-hero-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}.vip-progress-chip{display:flex;align-items:baseline;gap:6px;padding:8px 14px;background:#0071e314;border:1px solid rgba(0,113,227,.25);border-radius:var(--radius-full);white-space:nowrap}.vip-progress-chip .chip-label{font-size:12px;color:var(--text-light)}.vip-progress-chip strong{font-size:16px;color:var(--primary);font-weight:700}.vip-progress-chip .chip-sub{font-size:12px;color:var(--text-light)}.vip-status-badge.expiring{background:#ff9f0a1f;border-color:#ff9f0a73;color:#b45309}.vip-status-badge.locked{background:#94a3b81f;border-color:#94a3b859;color:#64748b}.vip-status-badge.expired{background:#ef44441f;border-color:#ef444473;color:#b91c1c}.vip-promo{display:flex;align-items:center;justify-content:space-between;margin:0 0 16px;padding:16px 22px;background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-radius:var(--radius-lg);border:1px solid rgba(255,255,255,.5);box-shadow:var(--shadow-card);transition:all var(--dur-normal) var(--ease-out)}.vip-promo:hover{box-shadow:var(--shadow-soft)}.promo-left{display:flex;align-items:center;gap:14px}.promo-tag{padding:4px 10px;background:var(--primary);border-radius:var(--radius-full);color:#fff;font-weight:600;font-size:12px}.promo-left h3{margin:0;color:var(--text-dark);font-size:15px;font-weight:600}.promo-left p{margin:0;color:var(--text-light);font-size:13px}.promo-left strong{font-size:16px;color:var(--primary);font-weight:700}.promo-btn{padding:9px 22px;background:var(--primary);border:none;border-radius:var(--radius-full);color:#fff;font-size:13px;font-weight:600;cursor:pointer;transition:all var(--dur-fast)}.promo-btn:hover{background:var(--primary-dark)}.sections-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.section-card{position:relative;display:flex;align-items:center;gap:16px;padding:20px 22px;border-radius:var(--radius-xl);cursor:pointer;transition:all var(--dur-normal) var(--ease-out);overflow:hidden;background:var(--bg-card);border:1px solid var(--border-light);box-shadow:var(--shadow-card);animation:fadeInUp .4s var(--ease-out) both}.section-card:nth-child(1){animation-delay:0s}.section-card:nth-child(2){animation-delay:.05s}.section-card:nth-child(3){animation-delay:.1s}.section-card:nth-child(4){animation-delay:.15s}.section-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover);border-color:#0071e34d}.section-card:active{transform:translateY(0) scale(.99)}.section-card-icon{display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:16px;flex-shrink:0;overflow:hidden;border:1px solid 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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 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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 var(--border-soft);background:#ffffffb3;border-radius:8px;font-size:13px;cursor:pointer;transition:all var(--dur-fast) var(--ease-out)}.auth-back:hover,.auth-logout:hover{background:#fffffff2}.auth-logout{color:var(--danger);border-color:var(--danger)}.auth-vip-panel{padding:16px 0}.auth-vip-unlogin{text-align:center;padding:32px 0}.auth-vip-unlogin p{margin-bottom:16px;color:var(--text-light)}.auth-vip-unlogin button{padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:8px;cursor:pointer}.vip-status{padding:16px;background:var(--bg-warm);border-radius:12px;margin-bottom:20px}.vip-status p{margin:6px 0;font-size:14px}.vip-active{color:var(--success);font-weight:600}.vip-inactive{color:var(--text-light)}.vip-plans{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.vip-plan-card{position:relative;padding:18px 12px;background:var(--bg-card);border:1px solid 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12px;font-size:11px;color:#86868b;font-weight:450}@keyframes systemHintIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.floating-contact-root{position:fixed;right:24px;bottom:24px;z-index:9000;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}.floating-contact-btn{position:relative;width:56px;height:56px;border-radius:50%;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,#0071e3,#5856d6 60%,#ff9f0a 140%);box-shadow:0 10px 30px #0071e359,0 2px 8px #5856d640,inset 0 1px #ffffff40;backdrop-filter:saturate(140%) blur(20px);-webkit-backdrop-filter:saturate(140%) blur(20px);transition:transform .26s cubic-bezier(.22,1,.36,1),box-shadow .26s ease;animation:fcBreath 4s ease-in-out infinite}.floating-contact-btn:hover{transform:translateY(-2px) scale(1.04);box-shadow:0 14px 40px #0071e373,0 4px 12px #5856d64d,inset 0 1px #ffffff4d}.floating-contact-btn:active{transform:translateY(0) scale(.98)}.floating-contact-btn.is-open{animation:none;background:linear-gradient(135deg,#3a3a3c,#1c1c1e);box-shadow:0 8px 24px #0000004d}.floating-contact-btn-icon{display:inline-flex;align-items:center;justify-content:center}.floating-contact-tooltip{position:absolute;right:calc(100% + 10px);top:50%;transform:translateY(-50%) translate(6px);padding:6px 12px;font-size:12px;font-weight:500;color:#1d1d1f;background:#ffffffeb;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid rgba(0,0,0,.06);border-radius:10px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .22s ease,transform .22s ease;box-shadow:0 4px 14px #00000014}.floating-contact-btn:hover .floating-contact-tooltip{opacity:1;transform:translateY(-50%) translate(0)}.floating-contact-btn.is-open .floating-contact-tooltip{opacity:0}@keyframes fcBreath{0%,to{box-shadow:0 10px 30px #0071e359,0 2px 8px #5856d640,inset 0 1px #ffffff40}50%{box-shadow:0 14px 38px #0071e37a,0 2px 10px #5856d652,inset 0 1px #ffffff4d}}.floating-contact-popup{position:absolute;right:0;bottom:72px;width:300px;padding:20px 20px 16px;border-radius:24px;background:#ffffffd1;backdrop-filter:blur(24px) saturate(160%);-webkit-backdrop-filter:blur(24px) saturate(160%);border:1px solid rgba(255,255,255,.6);box-shadow:0 20px 60px #0000002e,0 8px 20px #00000014,inset 0 1px #fffc;transform-origin:bottom right;animation:fcPopIn .3s cubic-bezier(.22,1,.36,1)}@keyframes fcPopIn{0%{opacity:0;transform:scale(.92) translateY(8px)}to{opacity:1;transform:scale(1) translateY(0)}}.floating-contact-close{position:absolute;top:10px;right:10px;width:24px;height:24px;border-radius:50%;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#86868b;background:#0000000a;transition:background .18s ease,color .18s ease}.floating-contact-close:hover{background:#00000014;color:#1d1d1f}.floating-contact-header{text-align:center;margin-bottom:14px}.floating-contact-title{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:#1d1d1f;background:linear-gradient(135deg,#0071e3,#5856d6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.floating-contact-title .icon{color:#5856d6;-webkit-text-fill-color:currentColor}.floating-contact-subtitle{margin-top:4px;font-size:12px;color:#86868b;font-weight:450}.floating-contact-qr{width:100%;border-radius:16px;overflow:hidden;background:#fff;border:1px solid rgba(0,0,0,.05);box-shadow:0 4px 12px #0000000f;display:flex;align-items:center;justify-content:center;padding:6px}.floating-contact-qr img{width:100%;height:auto;max-height:360px;object-fit:contain;display:block}.floating-contact-tags{list-style:none;margin:14px 0 10px;padding:0;display:flex;flex-direction:column;gap:6px}.floating-contact-tags li{display:flex;align-items:center;gap:8px;font-size:12px;color:#3a3a3c;font-weight:450}.fc-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}.fc-dot-blue{background:#0071e3}.fc-dot-violet{background:#5856d6}.fc-dot-amber{background:#ff9f0a}.floating-contact-footer{display:flex;align-items:center;justify-content:center;gap:6px;padding-top:10px;border-top:1px solid rgba(0,0,0,.06);font-size:11px;color:#86868b;font-weight:450}.floating-contact-footer .icon{color:#86868b}@media (max-width: 768px){.floating-contact-root{right:16px;bottom:16px}.floating-contact-btn{width:48px;height:48px}.floating-contact-btn-icon .icon{width:20px;height:20px}.floating-contact-tooltip{display:none}.floating-contact-popup{width:min(280px,calc(100vw - 32px));right:0;bottom:60px;padding:16px 16px 14px;border-radius:20px}}.lab-hint-stack{position:absolute;top:12px;right:16px;z-index:900;display:flex;flex-direction:column;align-items:stretch;width:min(400px,calc(100% - 32px));max-height:calc(100% - 100px);overflow-y:auto;pointer-events:none;-webkit-mask-image:linear-gradient(to bottom,black 88%,transparent 100%);mask-image:linear-gradient(to bottom,black 88%,transparent 100%)}.lab-hint-stack .system-hint-card{margin:4px 0;box-shadow:0 4px 24px #0f172a2e;pointer-events:auto}@media (max-width: 768px){.lab-hint-stack{top:8px;right:8px;width:calc(100% - 16px);max-height:45%}}