.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, #764ba2);color:white;padding:6px 18px;border-radius:40px;font-size:0.75rem;font-weight:500}.tool-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg, #1e293b, #667eea);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px}.tool-header p{color:var(--gray-500)}.dual-upload{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:32px}.upload-card{background:white;border-radius:24px;overflow:hidden;border:1px solid var(--gray-200);transition:all 0.3s}.upload-card:hover{box-shadow:0 12px 25px rgba(0,0,0,0.08)}.upload-card-header{display:flex;align-items:center;gap:12px;padding:16px 20px;background:linear-gradient(135deg, #f8fafc, #fff);border-bottom:1px solid var(--gray-200)}.upload-card-header i{font-size:1.2rem;color:#667eea}.upload-card-header span{font-weight:600;color:var(--gray-700)}.upload-status{margin-left:auto;font-size:0.7rem;padding:4px 12px;border-radius:30px;background:var(--gray-100);color:var(--gray-500)}.upload-status.selected{background:#d1fae5;color:#065f46}.upload-area{border:2px dashed var(--gray-300);border-radius:20px;margin:20px;padding:40px 20px;text-align:center;cursor:pointer;transition:all 0.3s;background:var(--gray-50)}.upload-area:hover{border-color:#667eea;background:white}.upload-area i{font-size:48px;color:var(--gray-400);margin-bottom:16px}.upload-hint{font-size:0.7rem;color:var(--gray-400);margin-top:8px}.upload-btn{margin-top:16px}.video-preview{margin:16px 20px 20px}.preview-video{width:100%;max-height:180px;border-radius:16px;background:#1a1a2e}.remove-video{background:transparent;border:1px solid var(--gray-200);padding:6px 16px;border-radius:30px;margin-top:12px;cursor:pointer;font-size:0.75rem;transition:all 0.2s;width:100%}.remove-video:hover{background:#fee2e2;border-color:#ef4444;color:#ef4444}.layout-section{background:var(--gray-50);border-radius:20px;padding:20px;margin-bottom:24px}.layout-section h4{margin-bottom:16px;font-size:0.9rem;color:var(--gray-700);display:flex;align-items:center;gap:8px}.layout-buttons{display:flex;gap:16px;flex-wrap:wrap}.layout-btn{background:white;border:1px solid var(--gray-200);padding:10px 24px;border-radius:50px;cursor:pointer;transition:all 0.3s;display:flex;align-items:center;gap:8px;font-weight:500}.layout-btn i{font-size:1rem}.layout-btn.active{background:linear-gradient(135deg, #667eea, #764ba2);border-color:transparent;color:white}.preview-section{margin-top:8px;border-top:1px solid var(--gray-200);padding-top:24px}.preview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:16px}.preview-actions{display:flex;gap:12px;flex-wrap:wrap}.merge-preview{background:#1a1a2e;border-radius:24px;min-height:320px;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}.preview-placeholder{text-align:center;color:var(--gray-500)}.preview-placeholder i{font-size:48px;margin-bottom:16px;opacity:0.5}.preview-placeholder span{font-size:0.7rem;display:block;margin-top:8px;color:var(--gray-500)}.merge-canvas{width:100%;max-height:500px;background:#000;display:block}.btn-outline{background:transparent;border:1px solid var(--gray-300);padding:10px 20px;border-radius:40px;cursor:pointer;transition:all 0.3s;display:inline-flex;align-items:center;gap:8px}.btn-outline:hover{background:var(--gray-100);border-color:#ef4444;color:#ef4444}.info-footer{margin-top:32px;background:var(--gray-50);border-radius:24px;padding:24px}.info-footer-header{display:flex;align-items:center;gap:8px;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:32px;height:32px;background:linear-gradient(135deg, #667eea, #764ba2);color:white;border-radius:50%;display:flex;align-items:center;justify-content:center;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)}.loading-spinner{display:inline-block;width:40px;height:40px;border:3px solid rgba(102,126,234,0.3);border-top-color:#667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width:900px){.dual-upload{grid-template-columns:1fr}.info-footer-steps{grid-template-columns:repeat(2, 1fr)}.layout-buttons{justify-content:center}.preview-header{flex-direction:column;align-items:flex-start}}@media (max-width:600px){.info-footer-steps{grid-template-columns:1fr}}