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

html, body {
    font-family: 'Courier New', Courier, monospace;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
    height: 100%;
}

body {
    padding: 16px;
    box-sizing: border-box;
}

h2 {
    margin: 0 0 16px 0;
    font-size: 18px;
    font-weight: 600;
}

h3 {
    margin: 0 0 8px 0;
    font-size: 14px;
    font-weight: 600;
}

.container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    overflow: hidden;
}

.main-layout {
    display: flex;
    gap: 16px;
    flex: 1;
    overflow: hidden;
}

.left-panel {
    width: 260px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    gap: 12px;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.app-logo {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.app-brand-copy {
    min-width: 0;
}

.app-title {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    color: #000000;
}

.app-description {
    font-size: 11px;
    color: #888;
    margin: 2px 0 0 0;
}

.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 300px;
    overflow: hidden;
}

.panel-section {
    background-color: white;
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.section-header h3 {
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-menu-container {
    position: relative;
    flex-shrink: 0;
}

.header-menu-button {
    width: 28px;
    height: 28px;
}

.toolbar {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 8px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: relative;
    z-index: 10;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background-color: #ddd;
    margin: 0 8px;
}

.toolbar-spacer {
    margin-left: auto;
}

.size-control {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.form-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.form-group label {
    font-size: 12px;
    font-weight: 500;
}

.form-group input[type="text"] {
    flex: 1;
    padding: 6px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 12px;
}

.size-control label {
    font-size: 12px;
    font-weight: 500;
}

.size-control button {
    width: 28px;
    height: 28px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    padding: 0;
}

.size-control button:hover {
    background-color: #f0f0f0;
}

.size-control button.active {
    background-color: #e8f1ff;
    border-color: #2196f3;
}

.size-control input {
    width: 56px;
    min-width: 56px;
    height: 28px;
    box-sizing: border-box;
    text-align: center;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 4px 6px;
    font-size: 12px;
    -moz-appearance: textfield;
}

.size-control input::-webkit-outer-spin-button,
.size-control input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.size-input-label {
    font-size: 12px;
    font-weight: 500;
    color: #555;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.canvas-container {
    flex: 1;
    background-color: #f0f0f0;
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.canvas-wrapper {
    position: absolute;
    display: block;
    background-color: white;
    border: 1px solid #ddd;
    overflow: hidden;
    top: 0;
    left: 0;
    will-change: transform;
}

#pixelCanvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: top left;
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    pointer-events: none;
}

.preview-area {
    position: absolute;
    top: 16px;
    left: 16px;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    width: auto;
}

.preview-content {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
    margin: 0 auto;
}

#previewCanvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.color-preview-tooltip {
    position: fixed;
    width: 20px;
    height: 20px;
    border: 1px solid #000;
    border-radius: 2px;
    pointer-events: none;
    z-index: 1001;
    display: none;
}

#dimensionPreview {
    position: fixed;
    display: none;
    pointer-events: none;
    z-index: 1001;
    padding: 6px 8px;
    border-radius: 4px;
    background-color: rgba(33, 150, 243, 0.95);
    color: white;
    font-size: 12px;
    line-height: 1;
    white-space: nowrap;
}

.zoom-controls {
    position: absolute;
    bottom: 16px;
    right: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-radius: 4px;
    padding: 4px;
}

.zoom-button {
    width: 32px;
    height: 32px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.zoom-button:hover {
    background-color: #f0f0f0;
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.action-button {
    width: 100%;
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    font-size: 14px;
    font-family: 'Courier New', Courier, monospace;
}

.action-button:hover {
    background-color: #f0f0f0;
}

.action-button.primary {
    background-color: #2196f3;
    color: white;
    border-color: #2196f3;
}

.action-button.primary:hover {
    background-color: #1976d2;
}

.split-button {
    display: flex;
    position: relative;
    width: 100%;
}

.split-button-main {
    flex: 1;
    border-radius: 4px 0 0 4px;
    border-right: none;
}

.split-button-toggle {
    width: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0 4px 4px 0;
    flex-shrink: 0;
}

.split-button-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 36px;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    z-index: 100;
    margin-top: 4px;
    overflow: hidden;
}

.split-button-menu.show {
    display: block;
}

.header-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 132px;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    z-index: 120;
    overflow: hidden;
}

.header-dropdown-menu.show {
    display: block;
}

.dropdown-item {
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    text-align: center;
    cursor: pointer;
    font-size: 14px;
    font-family: 'Courier New', Courier, monospace;
}

.dropdown-item:hover {
    background-color: #f0f0f0;
}

.dropdown-item-with-icon {
    display: flex;
    align-items: center;
    gap: 10px;
    text-align: left;
}

.dropdown-item-with-icon img {
    flex-shrink: 0;
}

.tool-button {
    width: 40px;
    height: 40px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-family: 'Courier New', Courier, monospace;
    padding: 6px;
}

.tool-button svg {
    width: 24px;
    height: 24px;
}

.tool-button:hover {
    background-color: #f0f0f0;
}

.tool-button.active {
    background-color: #e3f2fd;
    border-color: #2196f3;
}

.stroke-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.stroke-control input[type="range"] {
    flex: 1;
}

.stroke-control span {
    min-width: 36px;
    font-size: 12px;
    color: #555;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    font-size: 12px;
    color: #555;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    cursor: pointer;
}

.color-picker {
    display: flex;
    align-items: center;
    gap: 12px;
}

.color-preview {
    width: 40px;
    height: 40px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    flex-shrink: 0;
}

.color-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    max-width: calc(100% - 52px);
    font-size: 12px;
    font-family: 'Courier New', Courier, monospace;
}

.color-palette {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    margin-top: 12px;
}

.color-swatch {
    width: 24px;
    height: 24px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    background: none;
}

.color-swatch:hover {
    transform: scale(1.1);
}

.layers-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.add-layer-button {
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    border-radius: 4px;
    background-color: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s ease;
}

.add-layer-button:hover,
.icon-action-button:hover {
    background-color: #f0f0f0;
}

.add-layer-button svg,
.icon-action-button svg {
    width: 16px;
    height: 16px;
}

.icon-action-button {
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    border-radius: 4px;
    background-color: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s ease;
}

.layer-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.layer-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #f9f9f9;
    cursor: pointer;
}

.layer-item[draggable="true"] {
    cursor: grab;
}

.layer-item.dragging {
    opacity: 0.45;
    cursor: grabbing;
}

.layer-item.drop-above {
    border-top: 2px solid #2196f3;
}

.layer-item.drop-below {
    border-bottom: 2px solid #2196f3;
}

.layer-thumbnail {
    width: 24px;
    height: 24px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 2px;
    overflow: hidden;
}

.layer-thumbnail-canvas {
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.layer-item.active {
    background-color: #e3f2fd;
    border-color: #2196f3;
}

.layer-name {
    flex: 1;
    font-size: 12px;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.layer-name-input {
    flex: 1;
    min-width: 0;
    font-size: 12px;
    font-family: 'Courier New', Courier, monospace;
    border: 1px solid #2196f3;
    border-radius: 4px;
    padding: 2px 4px;
    background-color: white;
}

.layer-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.layer-visibility {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    cursor: pointer;
}

.layer-visibility.hidden {
    opacity: 0.5;
}

.layer-delete {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: #ff5252;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    background: none;
    border: none;
    padding: 0;
}

.layer-item:hover .layer-delete {
    opacity: 1;
    pointer-events: auto;
}

.layer-visibility:hover {
    background-color: #f0f0f0;
    border-radius: 4px;
}

.layer-delete:hover {
    background-color: #ffebee;
    border-radius: 4px;
}

.toast {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background-color: rgba(76, 175, 80, 0.9);
    color: white;
    padding: 12px 20px;
    border-radius: 4px;
    font-size: 14px;
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: white;
    padding: 24px;
    border-radius: 8px;
    width: 80%;
    max-width: 600px;
    max-height: 80%;
    overflow: auto;
}

.modal-content h3 {
    margin-top: 0;
}

.modal-content textarea {
    width: 100%;
    height: 300px;
    margin: 16px 0;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
    resize: vertical;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    align-items: center;
}

.modal-actions-right {
    display: flex;
    gap: 8px;
}

.modal-actions button {
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
    font-size: 14px;
}

.modal-actions button:hover {
    background-color: #f0f0f0;
}

.modal-actions button.primary {
    background-color: #2196f3;
    color: white;
    border-color: #2196f3;
}

.modal-actions button.primary:hover {
    background-color: #1976d2;
}

.about-modal-content {
    max-width: 640px;
}

.devlog-modal-content {
    max-width: 680px;
}

.simplify-colors-modal-content {
    width: 360px;
    max-width: 360px;
    min-height: 220px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.simplify-colors-actions {
    margin-top: auto;
    justify-content: flex-end;
}

.about-brand {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.about-brand-copy h3 {
    margin-bottom: 4px;
    font-size: 20px;
}

.about-subtitle {
    margin: 0;
    font-size: 12px;
    color: #777;
}

.about-description {
    font-size: 14px;
    line-height: 1.6;
    color: #444;
    margin-bottom: 20px;
}

.about-help-section + .about-help-section {
    margin-top: 20px;
}

.about-help-section h4 {
    margin: 0 0 10px;
    font-size: 14px;
    color: #222;
}

.about-help-section p {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: #555;
}

.about-help-list {
    margin: 0;
    padding-left: 18px;
    color: #444;
}

.about-help-list li {
    margin-bottom: 8px;
    font-size: 13px;
    line-height: 1.6;
}

.devlog-list {
    list-style: none;
    padding-left: 0;
}

.devlog-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.about-shortcuts {
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
    background-color: #fafafa;
}

.about-shortcut-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 12px;
    padding: 10px 12px;
    font-size: 13px;
    color: #444;
}

.about-shortcut-row + .about-shortcut-row {
    border-top: 1px solid #e5e7eb;
}

.about-shortcut-row span:first-child {
    font-family: monospace;
    color: #111;
}

#simplifyAutoControls {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

#simplifyAutoControls label {
    display: block;
    margin-bottom: 0;
    font-size: 12px;
    color: #555;
    white-space: nowrap;
}

#simplifyAutoControls input {
    width: 96px;
    padding: 6px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 12px;
}

.quick-recolor-panel {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid #eee;
}

.quick-recolor-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 6px;
}

.quick-recolor-panel h4 {
    margin: 0;
    font-size: 12px;
    color: #333;
}

.quick-recolor-swatch-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
    margin: 0;
}

.quick-recolor-swatch {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
}

.quick-recolor-swatch.selected {
    outline: 2px solid #2196f3;
    outline-offset: 1px;
}

.quick-recolor-toggle {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: #fff;
    color: #555;
    font-size: 11px;
    font-family: 'Courier New', Courier, monospace;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.quick-recolor-toggle:hover {
    background: #f5f5f5;
}

.quick-recolor-toggle-icon {
    display: block;
}

.quick-recolor-toggle-icon-up {
    transform: rotate(180deg);
}

.quick-recolor-native-picker {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.info-label {
    display: block;
    font-size: 12px;
    color: #555;
    margin-bottom: 4px;
}

@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    
    .left-panel {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .left-panel .panel-section {
        flex: 1;
        min-width: 200px;
    }

    .quick-recolor-swatch-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}