.drop-zone { border: 2px dashed var(--border-color); border-radius: 8px; padding: 25px 20px; text-align: center; cursor: pointer; transition: border-color 0.2s; background: #f9fafb; margin-bottom: 20px; }
            .drop-zone:hover { border-color: var(--primary); background: #fdfdff; }
            .drop-zone p { font-size: 0.9rem; color: #4b5563; }

            .workspace { display: none; flex-direction: column; gap: 16px; }
            
            #waveform-wrapper { position: relative; background: #f8fafc; border-radius: 8px; padding: 10px; border: 1px solid #e2e8f0; margin-bottom: 5px; overflow: hidden; }
            #waveform { width: 100%; }

            .options-card { background: #f8fafc; padding: 16px; border-radius: 8px; border: 1px solid #e2e8f0; display: flex; flex-direction: column; gap: 14px; }
            .option-group { display: flex; flex-direction: column; gap: 6px; }
            .option-group label { font-size: 0.9rem; font-weight: 600; color: #374151; display: flex; justify-content: space-between; }
            .option-group input[type="range"] { width: 100%; accent-color: var(--primary); cursor: pointer; }
            
            .checkbox-row { display: flex; gap: 20px; align-items: center; }
            .checkbox-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; font-weight: 500; color: #374151; font-size: 0.9rem; }

            .controls { display: flex; gap: 10px; }
            .btn { flex: 1; padding: 12px; border: none; border-radius: 8px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: background-color 0.2s; text-align: center; display: flex; align-items: center; justify-content: center; gap: 6px; }
            .btn-primary { background-color: var(--primary); color: white; }
            .btn-primary:hover { background-color: var(--primary-hover); }
            .btn-secondary { background-color: #e5e7eb; color: #374151; }
            .btn-secondary:hover { background-color: #d1d5db; }

            .loading { text-align: center; color: #6b7280; font-size: 0.9rem; margin: 20px 0; font-style: italic; display: none; }