/* Converter Box Styles */
    .converter-box {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        padding: 40px;
        border-radius: 12px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
        margin: 30px 0;
    }

    .converter-title {
        color: #ffffff;
        font-size: 28px;
        font-weight: 700;
        margin-bottom: 30px;
        text-align: center;
    }

    /* Form Styles */
    .form-group {
        margin-bottom: 20px;
    }

    .form-group label {
        display: block;
        color: #ffffff;
        font-weight: 600;
        margin-bottom: 8px;
        font-size: 14px;
    }

    .form-control {
        width: 100%;
        padding: 12px 16px;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 8px;
        font-size: 15px;
        background: rgba(255, 255, 255, 0.95);
        transition: all 0.3s ease;
        box-sizing: border-box;
    }

    .form-control:focus {
        outline: none;
        border-color: #ffffff;
        background: #ffffff;
        box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
    }

    .form-control-file {
        width: 100%;
        padding: 12px 16px;
        border: 2px dashed rgba(255, 255, 255, 0.5);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.95);
        color: #333;
        cursor: pointer;
        transition: all 0.3s ease;
        box-sizing: border-box;
    }

    .form-control-file:hover {
        border-color: #ffffff;
        background: #ffffff;
    }

    .form-control-textarea {
        width: 100%;
        padding: 12px 16px;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 8px;
        font-size: 14px;
        background: rgba(255, 255, 255, 0.95);
        font-family: 'Courier New', monospace;
        resize: vertical;
        transition: all 0.3s ease;
        box-sizing: border-box;
    }

    .form-control-textarea:focus {
        outline: none;
        border-color: #ffffff;
        background: #ffffff;
        box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
    }

    /* Tab Styles */
    .input-tabs {
        display: flex;
        gap: 10px;
        margin-bottom: 20px;
    }

    .tab-btn {
        flex: 1;
        padding: 12px 20px;
        background: rgba(255, 255, 255, 0.2);
        color: #ffffff;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 8px;
        cursor: pointer;
        font-weight: 600;
        transition: all 0.3s ease;
    }

    .tab-btn:hover {
        background: rgba(255, 255, 255, 0.3);
    }

    .tab-btn.active {
        background: #ffffff;
        color: #667eea;
        border-color: #ffffff;
    }

    .tab-content {
        display: none;
    }

    .tab-content.active {
        display: block;
    }

    /* Button Styles */
    .btn-convert {
        width: 100%;
        padding: 14px 24px;
        background: #ffffff;
        color: #667eea;
        border: none;
        border-radius: 8px;
        font-size: 16px;
        font-weight: 700;
        cursor: pointer;
        transition: all 0.3s ease;
        margin-top: 10px;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }

    .btn-convert:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    }

    .btn-convert:disabled {
        background: #cbd5e0;
        color: #718096;
        cursor: not-allowed;
        transform: none;
    }

    /* Progress Bar */
    .progress-container {
        display: none;
        margin-top: 25px;
    }

    .progress-bar-custom {
        width: 100%;
        height: 35px;
        background: rgba(255, 255, 255, 0.3);
        border-radius: 20px;
        overflow: hidden;
        position: relative;
        box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    .progress-fill {
        height: 100%;
        background: linear-gradient(90deg, #48bb78, #38a169);
        width: 0%;
        transition: width 0.4s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-weight: bold;
        font-size: 14px;
        border-radius: 20px;
    }

    /* Status Message */
    .status-message {
        margin-top: 20px;
        padding: 14px 18px;
        border-radius: 8px;
        display: none;
        font-weight: 500;
        text-align: center;
    }

    .status-success {
        background: rgba(72, 187, 120, 0.2);
        color: #ffffff;
        border: 2px solid rgba(72, 187, 120, 0.5);
    }

    .status-error {
        background: rgba(245, 101, 101, 0.2);
        color: #ffffff;
        border: 2px solid rgba(245, 101, 101, 0.5);
    }

    /* Preview Section */
    .preview-section {
        display: none;
        background: #ffffff;
        padding: 30px;
        border-radius: 12px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
        margin-top: 30px;
    }

    .preview-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 20px;
        padding-bottom: 15px;
        border-bottom: 2px solid #e2e8f0;
    }

    .preview-header h3 {
        margin: 0;
        color: #2d3748;
        font-size: 22px;
        font-weight: 700;
    }

    .btn-preview-toggle {
        padding: 8px 20px;
        background: #667eea;
        color: #ffffff;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-weight: 600;
        transition: all 0.3s ease;
    }

    .btn-preview-toggle:hover {
        background: #5568d3;
    }

    /* Table Preview */
    .preview-table-container {
        display: block;
        margin-bottom: 20px;
    }

    .table-wrapper {
        overflow-x: auto;
        border-radius: 8px;
        border: 1px solid #e2e8f0;
    }

    .preview-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 14px;
    }

    .preview-table thead {
        background: #f7fafc;
    }

    .preview-table th {
        padding: 12px 15px;
        text-align: left;
        font-weight: 700;
        color: #2d3748;
        border-bottom: 2px solid #e2e8f0;
        white-space: nowrap;
    }

    .preview-table td {
        padding: 10px 15px;
        border-bottom: 1px solid #e2e8f0;
        color: #4a5568;
    }

    .preview-table tbody tr:hover {
        background: #f7fafc;
    }

    .preview-table tbody tr:last-child td {
        border-bottom: none;
    }

    /* Raw Preview */
    .preview-raw-container {
        display: none;
        background: #1a202c;
        border-radius: 8px;
        padding: 20px;
        margin-bottom: 20px;
        overflow-x: auto;
    }

    .preview-raw-container pre {
        margin: 0;
        color: #e2e8f0;
        font-family: 'Courier New', monospace;
        font-size: 13px;
        line-height: 1.6;
        white-space: pre-wrap;
        word-wrap: break-word;
    }

    /* Download Button in Preview */
    .download-container-preview {
        margin-top: 20px;
    }

    .btn-download {
        width: 100%;
        padding: 14px 24px;
        background: #48bb78;
        color: #ffffff;
        border: none;
        border-radius: 8px;
        font-size: 16px;
        font-weight: 700;
        cursor: pointer;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
    }

    .btn-download:hover {
        background: #38a169;
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    }

    .btn-download svg {
        width: 20px;
        height: 20px;
    }

    /* Features Section */
    .section-heading {
        font-size: 24px;
        font-weight: 700;
        color: #2d3748;
        margin-bottom: 25px;
    }

    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 25px;
        margin-top: 30px;
    }

    .feature-item {
        background: #f7fafc;
        padding: 25px;
        border-radius: 10px;
        text-align: center;
        transition: all 0.3s ease;
        border: 2px solid transparent;
    }

    .feature-item:hover {
        transform: translateY(-5px);
        border-color: #667eea;
        box-shadow: 0 8px 20px rgba(102, 126, 234, 0.15);
    }

    .feature-icon {
        font-size: 48px;
        margin-bottom: 15px;
    }

    .feature-item h3 {
        font-size: 18px;
        font-weight: 700;
        color: #2d3748;
        margin-bottom: 10px;
    }

    .feature-item p {
        font-size: 14px;
        color: #718096;
        margin: 0;
        line-height: 1.6;
    }

    /* Responsive */
    @media (max-width: 768px) {
        .converter-box {
            padding: 25px 20px;
        }
        
        .converter-title {
            font-size: 24px;
        }
        
        .preview-header {
            flex-direction: column;
            align-items: flex-start;
            gap: 15px;
        }
        
        .feature-grid {
            grid-template-columns: 1fr;
        }
    }