/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #1a1a1a;
    color: #e0e0e0;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #ffffff;
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    color: #b0b0b0;
    font-size: 1rem;
}

/* Controls Section */
.controls {
    background-color: #252525;
    border: 1px solid #3a3a3a;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.control-group {
    margin-bottom: 15px;
}

.control-group:last-child {
    margin-bottom: 0;
}

/* Labels */
label {
    display: block;
    color: #e0e0e0;
    font-size: 0.95rem;
    margin-bottom: 8px;
    font-weight: 500;
}

/* File Upload */
.file-upload-label {
    display: inline-block;
    cursor: pointer;
}

.upload-text {
    display: inline-block;
    background-color: #3a3a3a;
    color: #e0e0e0;
    padding: 10px 20px;
    border-radius: 6px;
    border: 2px solid #4a4a4a;
    transition: all 0.2s ease;
    font-weight: 500;
}

.upload-text:hover {
    background-color: #4a4a4a;
    border-color: #5a5a5a;
}

input[type="file"] {
    display: none;
}

/* Slider */
input[type="range"] {
    width: 100%;
    height: 6px;
    background: #3a3a3a;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: #5a9fd4;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #6bb0e5;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: #5a9fd4;
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: background 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    background: #6bb0e5;
}

input[type="range"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

input[type="range"]:disabled::-webkit-slider-thumb {
    cursor: not-allowed;
    background: #4a4a4a;
}

input[type="range"]:disabled::-moz-range-thumb {
    cursor: not-allowed;
    background: #4a4a4a;
}

#paletteValue {
    color: #5a9fd4;
    font-weight: 600;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    background-color: #3a3a3a;
    color: #e0e0e0;
    border: 2px solid #4a4a4a;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover:not(:disabled) {
    background-color: #4a4a4a;
    border-color: #5a5a5a;
}

button:active:not(:disabled) {
    background-color: #2a2a2a;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Icon Buttons */
.icon-btn {
    padding: 10px;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.icon-btn svg {
    width: 24px;
    height: 24px;
}

.automaton-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

#playPauseBtn:not(:disabled) {
    background-color: #4caf50;
    border-color: #4caf50;
    color: #ffffff;
}

#playPauseBtn:hover:not(:disabled) {
    background-color: #5cbf60;
    border-color: #5cbf60;
}

#stepBtn:not(:disabled) {
    background-color: #5a9fd4;
    border-color: #5a9fd4;
    color: #ffffff;
}

#stepBtn:hover:not(:disabled) {
    background-color: #6bb0e5;
    border-color: #6bb0e5;
}

#resetBtn:not(:disabled) {
    background-color: #f44336;
    border-color: #f44336;
    color: #ffffff;
}

#resetBtn:hover:not(:disabled) {
    background-color: #e57373;
    border-color: #e57373;
}

/* Dither Buttons */
#ditherOrderedBtn:not(:disabled),
#ditherNearestBtn:not(:disabled) {
    background-color: #5a9fd4;
    border-color: #5a9fd4;
    color: #ffffff;
}

#ditherOrderedBtn:hover:not(:disabled),
#ditherNearestBtn:hover:not(:disabled) {
    background-color: #6bb0e5;
    border-color: #6bb0e5;
}

/* Canvas Container */
.canvas-container {
    background-color: #252525;
    border: 1px solid #3a3a3a;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    position: relative;
}

#mainCanvas {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

.canvas-placeholder {
    position: absolute;
    color: #6a6a6a;
    font-size: 1.1rem;
    pointer-events: none;
}

.canvas-container:has(canvas[width]) .canvas-placeholder {
    display: none;
}

/* Error and Warning Messages */
.error-message,
.warning-message {
    border-radius: 6px;
    padding: 15px 20px;
    margin-bottom: 20px;
    font-weight: 500;
    display: none;
}

.error-message {
    background-color: #d32f2f;
    color: #ffffff;
    border: 2px solid #b71c1c;
}

.warning-message {
    background-color: #f57c00;
    color: #ffffff;
    border: 2px solid #e65100;
}

.error-message:not(:empty),
.warning-message:not(:empty) {
    display: block;
}

/* Accessibility - Ensure sufficient contrast */
@media (prefers-contrast: high) {
    body {
        background-color: #000000;
        color: #ffffff;
    }
    
    .controls,
    .canvas-container {
        background-color: #1a1a1a;
        border-color: #ffffff;
    }
    
    button,
    .upload-text {
        border-width: 3px;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .controls {
        padding: 15px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .button-group.automaton-controls {
        flex-direction: row;
        justify-content: center;
    }
    
    button {
        width: 100%;
    }
    
    .icon-btn {
        width: 44px;
    }
}