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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 5px;
}

.container {
    max-width: 1920px;
    margin: 0 auto;
    background: white;
    border-radius: 5px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 8px;
}

header .subtitle {
    font-size: 0.95em;
    opacity: 0.9;
}

.main-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 0;
}

.toolbar {
    background: #f5f5f5;
    padding: 20px;
    border-right: 1px solid #e0e0e0;
    overflow-y: auto;
    max-height: 100vh;
}

.toolbar h3 {
    font-size: 1em;
    margin-top: 20px;
    margin-bottom: 12px;
    color: #333;
    font-weight: 600;
}

.toolbar h3:first-child {
    margin-top: 0;
}

.button-group {
    margin-bottom: 20px;
}

.btn {
    display: block;
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 8px;
    border: none;
    border-radius: 6px;
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.info-section {
    background: white;
    padding: 12px;
    border-radius: 6px;
    margin-top: 20px;
}

.info-section h3 {
    margin-top: 0;
    font-size: 0.9em;
}

.info-section p {
    font-size: 0.85em;
    color: #666;
    line-height: 1.5;
}

.canvas-area {
    display: flex;
    gap: 20px;
    padding: 30px;
    overflow-x: auto;
    overflow-y: auto;
    background: #fafafa;
    flex-wrap: nowrap;
    align-items: flex-start;
}

.editor-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.editor-section h3 {
    margin-bottom: 15px;
    color: #333;
}

canvas {
    border: 2px solid #ddd;
    background: white;
    cursor: crosshair;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

#mainCanvas {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

#importCanvas {
    opacity: 0.9;
}

.import-preview {
    flex: 1;
}

.import-preview.hidden {
    display: none;
}

.help-text {
    margin-top: 12px;
    font-size: 0.85em;
    color: #999;
    text-align: center;
    max-width: 300px;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    margin-bottom: 20px;
    color: #333;
}

.modal-content label {
    display: block;
    margin-bottom: 10px;
    color: #666;
    font-weight: 500;
}

.modal-content input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    margin-bottom: 20px;
}

.modal-buttons {
    display: flex;
    gap: 10px;
}

.modal-buttons .btn {
    flex: 1;
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 200px 1fr;
    }

    .canvas-area {
        flex-direction: column;
        padding: 15px;
    }

    header h1 {
        font-size: 1.8em;
    }
}

@media (max-width: 768px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .toolbar {
        border-right: none;
        border-bottom: 1px solid #e0e0e0;
    }

    header h1 {
        font-size: 1.5em;
    }

    canvas {
        max-width: 100%;
        height: auto;
    }
}

/* Drag and drop styling */
canvas.drag-over {
    background: #f0f8ff;
    border-color: #667eea;
}

/* Mode selection buttons */
.mode-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.mode-btn {
    padding: 20px;
    border: 2px solid #ddd;
    background: #f9f9f9;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.mode-btn:hover {
    border-color: #667eea;
    background: #f0f8ff;
}

.mode-btn strong {
    font-size: 1em;
    color: #333;
}

.mode-btn small {
    font-size: 0.75em;
    color: #999;
    text-align: center;
}

/* Canvas wrapper for scaling */
.canvas-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
}

.canvas-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Selected icon highlight */
canvas.icon-selected::after {
    content: '';
}

/* Settings Section */
.settings-section {
    background: white;
    padding: 0;
    border-radius: 6px;
    margin-top: 20px;
    border: 1px solid #e0e0e0;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid #e0e0e0;
}

.settings-header h3 {
    margin: 0;
    font-size: 0.9em;
}

.toggle-btn {
    background: none;
    border: none;
    font-size: 0.8em;
    cursor: pointer;
    color: #666;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-btn.collapsed {
    transform: rotate(-90deg);
}

.settings-content {
    padding: 12px;
    max-height: 500px;
    overflow-y: auto;
    transition: max-height 0.3s ease;
}

.settings-content.hidden {
    max-height: 0;
    overflow: hidden;
    padding: 0 12px;
}

.color-control {
    margin-bottom: 12px;
}

.color-control label {
    display: block;
    font-size: 0.85em;
    font-weight: 500;
    margin-bottom: 4px;
    color: #333;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hue-slider {
    flex: 1;
    height: 5px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.hue-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hue-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    border: none;
}

.hue-slider:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.slider-container span {
    font-size: 0.85em;
    color: #666;
    min-width: 35px;
    text-align: right;
}

/* Grid Settings controls */
.grid-setting-control {
    margin-bottom: 10px;
}

.grid-setting-control label {
    display: block;
    font-size: 0.85em;
    font-weight: 500;
    margin-bottom: 4px;
    color: #333;
}

.settings-select,
.settings-input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.85em;
    background: white;
    color: #333;
    outline: none;
    transition: border-color 0.2s;
}

.settings-select:focus,
.settings-input:focus {
    border-color: #667eea;
}

.settings-input:disabled {
    background: #f0f0f0;
    color: #999;
    cursor: not-allowed;
}

/* Pixel selection active indicator */
#pixelSelectInfo {
    transition: color 0.2s;
}

#pixelSelectCanvas {
    touch-action: none;
}