.fu-tool-io {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
        }

        @media (min-width: 768px) {
            .fu-tool-io {
                grid-template-columns: 1fr 1fr;
            }
        }
        .fu-input-section, .fu-output-section {
            width: 100%;
        }

        .fu-input-section h2, .fu-output-section h2 {
            font-size: 1.2rem;
            margin-bottom: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .fu-action-buttons {
            display: flex;
            gap: 10px;
        }
        .fu-btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: 10px 20px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .fu-btn:hover {
            background-color: #d35400;
            transform: translateY(-2px);
        }

        .fu-btn.secondary {
            background-color: transparent;
            border: 1px solid var(--border-color);
            color: var(--light-text);
        }

        .fu-btn.secondary:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
        }
        .fu-input-section, .fu-output-section {
            width: 100%;
        }

        .fu-input-section h2, .fu-output-section h2 {
            font-size: 1.2rem;
            margin-bottom: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .fu-action-buttons {
            display: flex;
            gap: 10px;
        }
        .fu-output-result {
            min-height: 200px;
            padding: 15px;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            background-color: var(--light-bg);
            white-space: pre-wrap;
            overflow-x: auto;
            font-family: monospace;
            font-size: 0.95rem;
            line-height: 1.5;
        }
        textarea {
            width: 100%;
            height: 200px;
            padding: 15px;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            resize: vertical;
            font-family: inherit;
            font-size: 0.95rem;
            line-height: 1.5;
            outline: none;
            transition: var(--transition);
        }

        textarea:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }