.audio-merger-container{display:flex;flex-direction:column;gap:1.5rem}.file-list{display:flex;flex-direction:column;gap:.5rem;padding:1rem;background:var(--bg-secondary, #f8f9fa);border-radius:12px;min-height:150px}.file-list-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}.file-list-header h4{margin:0;font-size:1rem;color:var(--text-primary, #212529)}.file-item{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;background:#fff;border:1px solid var(--border-color, #dee2e6);border-radius:8px;transition:all .2s ease}.file-item:hover{border-color:var(--primary-color, #007bff)}.file-item.dragging{opacity:.5;border-color:var(--primary-color, #007bff)}.drag-handle{cursor:grab;color:var(--text-secondary, #6c757d);font-size:1.25rem}.drag-handle:active{cursor:grabbing}.file-info{flex:1;display:flex;flex-direction:column;gap:.125rem;min-width:0}.file-name{font-weight:500;color:var(--text-primary, #212529);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-duration{font-size:.75rem;color:var(--text-secondary, #6c757d)}.play-btn,.remove-btn{background:none;border:none;cursor:pointer;padding:.25rem;font-size:1.25rem;color:var(--text-secondary, #6c757d);transition:color .2s ease}.play-btn:hover{color:var(--primary-color, #007bff)}.remove-btn:hover{color:#dc3545}.empty-list{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;color:var(--text-secondary, #6c757d);text-align:center}.empty-list .icon{font-size:2rem;margin-bottom:.5rem}.controls-section{display:flex;gap:1.5rem;align-items:center;justify-content:center;flex-wrap:wrap;padding:1rem;background:var(--bg-secondary, #f8f9fa);border-radius:8px}.control-group{display:flex;flex-direction:column;gap:.25rem;align-items:center}.control-group label{font-size:.75rem;color:var(--text-secondary, #6c757d)}.control-group select{padding:.5rem .75rem;border:1px solid var(--border-color, #dee2e6);border-radius:6px;font-size:.875rem}.action-bar{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}.total-duration{text-align:center;font-size:.875rem;color:var(--text-secondary, #6c757d)}.processing-overlay{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem;gap:1rem;color:var(--text-primary, #212529)}.spinner{width:48px;height:48px;border:4px solid var(--border-color, #dee2e6);border-top-color:var(--primary-color, #007bff);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.progress-bar{width:100%;max-width:300px;height:8px;background:var(--border-color, #dee2e6);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:var(--primary-color, #007bff);transition:width .3s ease}.result-section{display:flex;flex-direction:column;gap:1rem;padding:1.5rem;background:var(--bg-secondary, #f8f9fa);border-radius:12px;align-items:center}.result-audio{width:100%;max-width:500px}.result-actions{display:flex;gap:.75rem}.error-message{padding:1rem;background:var(--color-error-subtle);border:1px solid var(--color-error);border-radius:8px;color:var(--color-error)}.privacy-note{text-align:center;padding:1rem;color:var(--text-secondary, #6c757d);font-size:.875rem}