body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

#original-image, #sketch-canvas {
    object-fit: contain;
}

input[type="range"] {
    -webkit-appearance: none;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: #3b82f6;
    border-radius: 50%;
    cursor: pointer;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}