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

:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7c8ff0;
    --secondary-color: #764ba2;
    --bg-dark: #1a1a1a;
    --bg-panel: #2d2d2d;
    --bg-hover: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* 顶部工具栏 */
.toolbar {
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 60px;
}

.toolbar-section {
    display: flex;
    align-items: center;
    gap: 20px;
}

.center-section {
    flex: 1;
    justify-content: center;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.canvas-info {
    display: flex;
    gap: 15px;
    align-items: center;
}

.info-group {
    display: flex;
    align-items: center;
    gap: 5px;
}

.info-group label {
    color: var(--text-secondary);
    font-size: 12px;
}

.info-group input {
    width: 60px;
    padding: 4px 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 14px;
}

.info-group span {
    color: var(--text-primary);
    font-weight: 500;
}

.view-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.tool-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tool-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.tool-btn svg {
    fill: currentColor;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-dark);
    padding: 5px 10px;
    border-radius: 6px;
}

.zoom-btn {
    width: 24px;
    height: 24px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.zoom-btn:hover {
    background: var(--bg-hover);
}

#zoomSlider {
    width: 100px;
    appearance: none;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}

#zoomSlider::-webkit-slider-thumb {
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

#zoomValue {
    min-width: 45px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
}

.color-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-indicator label {
    color: var(--text-secondary);
    font-size: 12px;
}

.current-color {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: #000;
}

#colorCode {
    font-family: monospace;
    font-size: 12px;
    color: var(--text-secondary);
}

.btn-primary {
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary svg {
    fill: currentColor;
}

/* 主布局 */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* 左侧工具面板 */
.tools-panel {
    width: 240px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 20px;
}

.tool-group {
    margin-bottom: 25px;
}

.tool-group h3 {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 12px;
    font-weight: 600;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.tool {
    width: 40px;
    height: 40px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.tool:hover {
    background: var(--bg-hover);
    border-color: var(--primary-color);
}

.tool.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.tool svg {
    width: 20px;
    height: 20px;
    fill: var(--text-secondary);
}

.tool.active svg {
    fill: white;
}

.brush-settings label {
    display: block;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-secondary);
}

.brush-settings input[type="range"] {
    width: 100%;
    margin-top: 5px;
}

.layers-list {
    background: var(--bg-dark);
    border-radius: 6px;
    padding: 10px;
}

.layer {
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    gap: 8px;
}

.layer:hover {
    background: var(--bg-hover);
}

.layer.active {
    background: var(--bg-hover);
    border: 1px solid var(--primary-color);
}

.layer-visibility {
    cursor: pointer;
}

.layer-name {
    flex: 1;
}

.layer-opacity {
    color: var(--text-secondary);
    font-size: 11px;
}

.add-layer-btn {
    width: 100%;
    margin-top: 8px;
    padding: 8px;
    background: transparent;
    border: 1px dashed var(--border-color);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}

.add-layer-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.history-controls {
    display: flex;
    gap: 8px;
}

.history-btn {
    flex: 1;
    padding: 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    font-size: 12px;
}

.history-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.history-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* 中间画布区域 */
.canvas-area {
    flex: 1;
    background: var(--bg-dark);
    display: flex;
    flex-direction: column;
    position: relative;
}

.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: auto;
    background-image: 
        linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
        linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

#mainCanvas, #gridCanvas, #previewCanvas {
    position: absolute;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

#gridCanvas {
    pointer-events: none;
    opacity: 0.3;
}

#previewCanvas {
    pointer-events: none;
}

.canvas-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px;
    background: var(--bg-panel);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.canvas-placeholder:hover {
    border-color: var(--primary-color);
    background: var(--bg-hover);
}

.canvas-placeholder svg {
    margin-bottom: 20px;
}

.canvas-placeholder h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.canvas-placeholder p {
    color: var(--text-secondary);
    font-size: 14px;
}

.canvas-status {
    background: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    padding: 8px 20px;
    display: flex;
    gap: 30px;
    font-size: 12px;
    color: var(--text-secondary);
}

/* 右侧设置面板 */
.settings-panel {
    width: 320px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
}

.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--bg-hover);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
    padding: 20px;
}

.tab-content.active {
    display: block;
}

.palette-section h3 {
    font-size: 14px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
    margin-bottom: 20px;
}

.color-cell {
    aspect-ratio: 1;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.color-cell:hover {
    transform: scale(1.2);
    border-color: white;
    z-index: 10;
}

.color-cell.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.color-picker-section {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#customColor {
    width: 50px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

#colorHex {
    flex: 1;
    padding: 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-family: monospace;
}

#addColorBtn {
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}

#addColorBtn:hover {
    background: var(--primary-dark);
}

.recent-colors h4 {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.recent-colors-grid {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.recent-color {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid var(--border-color);
}

/* 像素化设置 */
.pixelate-settings, .advanced-settings {
    padding-top: 10px;
}

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

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.input-group span {
    min-width: 45px;
    text-align: right;
    font-size: 13px;
    color: var(--text-primary);
}

select {
    width: 100%;
    padding: 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 13px;
}

.setting-hint {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 5px;
}

.apply-btn {
    width: 100%;
    padding: 10px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
}

.apply-btn:hover {
    background: var(--primary-dark);
}

/* 高级设置 */
.shortcuts-list {
    background: var(--bg-dark);
    border-radius: 6px;
    padding: 10px;
}

.shortcut {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 8px;
    font-size: 12px;
}

.shortcut span {
    color: var(--text-secondary);
}

kbd {
    padding: 2px 6px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-family: monospace;
    font-size: 11px;
    color: var(--text-primary);
}

/* 统计信息 */
.statistics {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.statistics h3 {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 15px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.stat {
    background: var(--bg-dark);
    padding: 10px;
    border-radius: 6px;
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 输入框样式 */
input[type="range"] {
    appearance: none;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

/* 响应式 */
@media (max-width: 1400px) {
    .tools-panel {
        width: 200px;
    }
    
    .settings-panel {
        width: 280px;
    }
}

@media (max-width: 1200px) {
    .tools-panel {
        width: 60px;
        padding: 10px;
    }
    
    .tool-group h3 {
        display: none;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .brush-settings,
    .layers-list,
    .history-controls {
        display: none;
    }
}

@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    
    .tools-panel,
    .settings-panel {
        width: 100%;
        height: auto;
    }
}