.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; }
			
			/* Container principal da onda com posicionamento relativo para as máscaras */
			#waveform-wrapper { position: relative; background: #f8fafc; border-radius: 8px; padding: 10px; border: 1px solid #e2e8f0; margin-bottom: 10px; overflow: hidden; }
			#waveform { width: 100%; }

			/* Máscaras laterais translúcidas (esurecem o que está fora do corte) */
			.waveform-mask {
				position: absolute;
				top: 0;
				bottom: 0;
				background: rgba(0, 0, 0, 0.7); /* Ajuste a opacidade se quiser mais claro ou mais escuro */
				pointer-events: none; /* Permite clicar/arrastar a região por cima da máscara */
				z-index: 10;
				transition: width 0.05s linear;
			}
			#maskLeft { left: 0; width: 0%; }
			#maskRight { right: 0; width: 0%; }

			.time-info { display: flex; justify-content: space-between; font-size: 0.85rem; color: #4b5563; font-weight: 600; background: #f1f5f9; padding: 10px 14px; border-radius: 8px; }

			.options-row { display: flex; gap: 15px; background: #f8fafc; padding: 12px 14px; border-radius: 8px; border: 1px solid #e2e8f0; font-size: 0.9rem; align-items: center; justify-content: space-between; }
			.options-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; font-weight: 500; color: #374151; }

			.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; }