* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    padding-top: 40px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-family: 'Press Start 2P', cursive;
    font-size: 2rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    letter-spacing: 2px;
}

header p {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.6rem;
    opacity: 0.9;
    letter-spacing: 1px;
}

.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    background: rgba(255, 255, 255, 0.95);
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.upload-area:hover {
    border-color: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

.upload-area.dragover {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.upload-icon {
    width: 60px;
    height: 60px;
    color: #667eea;
    margin-bottom: 10px;
}

.upload-content p {
    font-size: 1.2rem;
    color: #555;
    margin: 0;
}

.upload-hint {
    font-size: 0.9rem !important;
    color: #888 !important;
}

.editor-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.controls-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 15px;
}

.palette-section {
    margin-bottom: 20px;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 0;
}

.toggle-label {
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .3s;
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: #667eea;
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.quantization-controls {
    transition: all 0.3s ease;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-group label {
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #e0e0e0;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.slider-value {
    min-width: 40px;
    text-align: center;
    font-weight: 600;
    color: #667eea;
    background: #f8f9fa;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.select-control {
    padding: 8px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    background: white;
    font-size: 0.9rem;
    color: #555;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.select-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.select-control:hover {
    border-color: #764ba2;
}

.button-group {
    display: flex;
    gap: 15px;
    align-items: end;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: #f8f9fa;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* Toggle Original Button - Always filled with enhanced hover */
#toggleOriginalBtn {
    background: #667eea;
    color: white;
    border: 2px solid #667eea;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    padding: 6px 12px;
    font-size: 0.75rem;
}

#toggleOriginalBtn:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
    border-color: #5a6fd8;
}

/* New Image Button - Smaller size */
#newImageBtn {
    padding: 6px 12px;
    font-size: 0.75rem;
}

.editor-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    align-items: start;
}

.images-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.images-header {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.images-container {
    display: flex;
    gap: 20px;
    transition: all 0.3s ease;
}

.images-container.single-image {
    justify-content: center;
}

.images-container.single-image #pixelCanvasWrapper {
    flex: 1.5;
    max-width: 80%;
}

.canvas-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
    flex: 1;
}

#originalCanvasWrapper {
    transition: all 0.3s ease;
    opacity: 1;
    transform: scale(1);
    width: 100%;
    height: auto;
}

#originalCanvasWrapper.hidden {
    opacity: 0;
    transform: scale(0.8);
    pointer-events: none;
    flex: 0;
    width: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

#pixelCanvasWrapper {
    transition: all 0.3s ease;
}

#pixelCanvasWrapper.expanded {
    transform: scale(1.05);
}

.controls-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.canvas-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.canvas-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.canvas {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    background: #f8f9fa;
    border: 2px solid #e9ecef;
}

.canvas-label {
    font-weight: 400;
    color: #555;
    font-size: 1.1rem;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .editor-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .images-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .controls-panel {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .canvas-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: 40px 15px;
    }
    
    .upload-icon {
        width: 50px;
        height: 50px;
    }
    
    .upload-content p {
        font-size: 1rem;
    }
    
    .editor-section {
        padding: 20px;
    }
}

/* Loading animation */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}