.tool-header{text-align:center;margin-bottom:40px}.header-badge{display:flex;justify-content:center;gap:12px;margin-bottom:24px;flex-wrap:wrap}.badge{background:linear-gradient(135deg, #667eea 0, #764ba2 100%);color:white;padding:6px 18px;border-radius:40px;font-size:0.75rem;font-weight:500;box-shadow:0 2px 8px rgba(0,0,0,0.1)}.tool-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg, #1e293b, #3b82f6);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px}.tool-header p{color:var(--gray-500);font-size:1rem}.steps-indicator{display:flex;justify-content:center;gap:40px;margin-bottom:32px;padding:0 20px;flex-wrap:wrap}.step{display:flex;align-items:center;gap:12px;opacity:0.5;transition:all 0.3s}.step.active{opacity:1}.step-number{width:36px;height:36px;background:var(--gray-200);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--gray-600)}.step.active .step-number{background:linear-gradient(135deg, var(--primary-color), var(--primary-dark));color:white;box-shadow:0 4px 12px rgba(59,130,246,0.3)}.step-label{font-size:0.85rem;font-weight:500;color:var(--gray-600)}.step.active .step-label{color:var(--primary-color)}.video-music-container{display:grid;grid-template-columns:360px 1fr;gap:24px}.upload-section{display:flex;flex-direction:column;gap:24px}.upload-card{background:white;border-radius:24px;padding:20px;border:1px solid var(--gray-200);transition:all 0.3s}.card-title{display:flex;align-items:center;gap:10px;font-weight:600;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--gray-200)}.card-title i{color:var(--primary-color);font-size:1.1rem}.upload-area{border:2px dashed var(--gray-300);border-radius:20px;padding:30px 20px;text-align:center;cursor:pointer;transition:all 0.3s}.upload-area:hover{border-color:var(--primary-color);background:var(--gray-50)}.upload-area i{font-size:48px;color:var(--gray-400);margin-bottom:12px}.upload-area p{margin-bottom:8px;font-size:0.9rem}.upload-hint{font-size:0.7rem;color:var(--gray-400);display:block;margin:8px 0}.upload-area.small{padding:20px}.upload-area.small i{font-size:32px}.file-info{margin-top:16px;padding:12px;background:var(--gray-50);border-radius:16px}.info-row{display:flex;align-items:center;gap:8px;font-size:0.8rem;padding:4px 0;color:var(--gray-600)}.info-row i{width:20px;color:var(--primary-color)}.music-tabs{display:flex;gap:12px;margin-bottom:16px}.music-tab{background:transparent;border:none;padding:6px 16px;border-radius:30px;cursor:pointer;font-size:0.8rem;transition:all 0.2s;color:var(--gray-600)}.music-tab.active{background:var(--primary-color);color:white}.music-panel{min-height:160px}.preset-list{display:grid;grid-template-columns:repeat(2, 1fr);gap:12px}.preset-item{background:var(--gray-50);border-radius:16px;padding:12px;display:flex;align-items:center;gap:10px;cursor:pointer;transition:all 0.2s}.preset-item:hover{background:var(--gray-100);transform:translateY(-2px)}.preset-item i{font-size:1.2rem;color:var(--primary-color)}.preset-item span{flex:1;font-size:0.8rem}.preview-preset{background:transparent;border:none;padding:4px 8px;border-radius:20px;cursor:pointer;color:var(--gray-500)}.preview-preset:hover{background:var(--gray-200);color:var(--primary-color)}.preview-section{display:flex;flex-direction:column;gap:24px}.preview-card,.settings-card,.export-card{background:white;border-radius:24px;padding:20px;border:1px solid var(--gray-200)}.video-preview-container{position:relative;border-radius:16px;overflow:hidden;background:#000}.preview-video{width:100%;max-height:300px;background:#000}.play-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.5);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:opacity 0.3s}.play-overlay i{font-size:48px;color:white;margin-bottom:8px}.play-overlay span{color:white;font-size:0.8rem}.play-overlay.hidden{opacity:0;pointer-events:none}.audio-waveform{margin-top:16px;background:var(--gray-100);border-radius:12px;padding:12px}#waveformCanvas{width:100%;height:60px}.setting-group{margin-bottom:20px}.setting-group label{display:flex;align-items:center;gap:8px;font-size:0.85rem;font-weight:500;margin-bottom:10px;color:var(--gray-700)}.slider-container{display:flex;align-items:center;gap:12px}.slider-container input{flex:1}.slider-container span{min-width:40px;font-size:0.8rem;color:var(--gray-600)}.checkbox-container{display:flex;align-items:center;gap:12px}.switch{position:relative;display:inline-block;width:50px;height:24px}.switch input{opacity:0;width:0;height:0}.slider.round{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:var(--gray-300);transition:0.3s;border-radius:24px}.slider.round:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background-color:white;transition:0.3s;border-radius:50%}input:checked+.slider.round{background-color:var(--primary-color)}input:checked+.slider.round:before{transform:translateX(26px)}.export-options{display:flex;flex-direction:column;gap:16px}.quality-select{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.quality-select label{font-size:0.85rem;color:var(--gray-600)}.quality-select select{flex:1;padding:8px 12px;border:1px solid var(--gray-300);border-radius:12px}.export-btn{width:100%;padding:14px;font-size:1rem}.progress-container{margin-top:16px}.progress-bar{background:var(--gray-200);border-radius:30px;height:8px;overflow:hidden}.progress-fill{width:0%;height:100%;background:linear-gradient(90deg, var(--primary-color), var(--primary-dark));transition:width 0.3s}.progress-text{text-align:center;font-size:0.75rem;color:var(--gray-500);margin-top:8px}.info-footer{margin-top:32px;background:var(--gray-50);border-radius:24px;padding:24px}.info-footer-header{display:flex;align-items:center;gap:10px;margin-bottom:20px;font-weight:600}.info-footer-steps{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px}.step-item{display:flex;gap:12px;align-items:flex-start}.step-number{width:28px;height:28px;background:var(--primary-color);color:white;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;flex-shrink:0}.step-content h4{font-size:0.85rem;margin-bottom:4px}.step-content p{font-size:0.7rem;color:var(--gray-500)}.info-note{margin-top:20px;padding:12px 16px;background:#fef3c7;border-radius:12px;font-size:0.75rem;color:#92400e;display:flex;align-items:center;gap:8px}.ad-section{margin:30px 0}.ad-banner{background:linear-gradient(135deg, #f5f5f5, #fff);border:1px solid var(--gray-200);border-radius:16px;padding:20px;text-align:center;position:relative}.ad-label{position:absolute;top:8px;right:12px;font-size:0.6rem;color:var(--gray-400)}@media (max-width:900px){.video-music-container{grid-template-columns:1fr}.steps-indicator{gap:20px}.info-footer-steps{grid-template-columns:repeat(2, 1fr)}}@media (max-width:480px){.info-footer-steps{grid-template-columns:1fr}.preset-list{grid-template-columns:1fr}.step{min-width:80px}}