.unified-upload-area {
            max-width: 900px;
            margin: 2rem auto;
            padding: 0 1rem;
        }
        
        .upload-preview-card {
            padding: 2rem;
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.07);
            border: 2px dashed #e2e8f0;
            transition: all 0.3s ease;
            cursor: pointer;
            min-height: 300px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
        }
        
        .upload-preview-card.drag-over {
            border-color: #4299e1;
            background-color: #f0f9ff;
            border-style: solid;
        }
        
        .upload-preview-card.has-files {
            border-style: solid;
            border-color: #e2e8f0;
            justify-content: flex-start;
        }
        
        .upload-instructions {
            padding: 2rem;
        }
        
        .upload-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: #4299e1;
        }
        
        .trust-notice {
            text-align: center;
            margin-top: 1.5rem;
            padding: 1rem;
            background-color: #f0fdf4;
            border: 1px solid #bbf7d0;
            border-radius: 0.5rem;
            font-size: 0.95rem;
            color: #166534;
        }
        
        /* Content Section Styles */
        .content-section {
            margin: 3rem 0;
            padding: 2rem;
            background: #ffffff;
            border-radius: 12px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            border: 1px solid #e2e8f0;
        }
        
        .content-section h2 {
            color: #2d3748;
            margin-bottom: 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #e2e8f0;
            font-size: 1.5rem;
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .feature-item {
            padding: 1.5rem;
            background-color: #f8fafc;
            border-radius: 8px;
            border-left: 4px solid #4299e1;
        }
        
        .feature-item h4 {
            color: #2d3748;
            margin-bottom: 0.75rem;
            font-size: 1.1rem;
        }
        
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .comparison-table th,
        .comparison-table td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .comparison-table th {
            background-color: #f8fafc;
            font-weight: 600;
            color: #2d3748;
        }
        
        .comparison-table tr:hover {
            background-color: #f8fafc;
        }
        
        .faq-item {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .faq-item:last-child {
            border-bottom: none;
        }
        
        .faq-question {
            font-weight: 600;
            color: #2d3748;
            margin-bottom: 0.75rem;
            font-size: 1.1rem;
        }
        
        .related-tools {
            margin-top: 3rem;
            padding: 2rem;
            background: #f8fafc;
            border-radius: 12px;
        }
        
        .tool-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 1.5rem;
        }
        
        .tool-card {
            padding: 1rem;
            background: white;
            border-radius: 8px;
            text-decoration: none;
            color: #2d3748;
            border: 1px solid #e2e8f0;
            transition: all 0.2s;
            text-align: center;
        }
        
        .tool-card:hover {
            border-color: #4299e1;
            background-color: #f0f9ff;
            transform: translateY(-2px);
        }
        
        /* No-JS fallback */
        .no-js-message {
            padding: 1.5rem;
            background: #fff3cd;
            border: 1px solid #ffecb5;
            border-radius: 8px;
            color: #856404;
            text-align: center;
            margin-bottom: 1.5rem;
        }
        
        .professional-use-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: #dbeafe;
            color: #1e40af;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.modern-button {
    position: relative;
    overflow: hidden;
}

.modern-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.modern-button:hover::before {
    width: 300px;
    height: 300px;
}

.modern-button:not(:disabled):hover {
    transform: translateY(-2px);
}

.convert-btn:not(:disabled):hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 24px rgba(66, 153, 225, 0.5);
}

.download-btn:hover {
    transform: translateY(-2px);
}

#downloadBtn:hover {
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.5);
}

#downloadZipBtn:hover {
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
    background: linear-gradient(135deg, #7c3aed, #6d28d9);
}

#downloadIndividualBtn:hover {
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.5);
}

.modern-button:active {
    transform: translateY(0);
}

#imageGrid::-webkit-scrollbar {
    width: 8px;
}

#imageGrid::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

#imageGrid::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 4px;
}

#imageGrid::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

#clearBtn:hover, #addMoreBtn:hover {
    background: #edf2f7;
    border-color: #cbd5e0;
}