* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

/* 主容器：颜色选择器 + 画布 */
.main-container {
    display: flex;
    gap: 30px;
    align-items: flex-start;
}

/* 颜色选择器区域 */
.color-picker {
    background-color: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 颜色选项容器 */
.color-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

/* 颜色方块 */
.color-option {
    width: 30px;
    height: 30px;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.1s;
}

/* 选中的颜色方块（加边框高亮） */
.color-option.selected {
    border-color: #1677ff;
    transform: scale(1.1);
}

/* 清空按钮 */
.clear-btn {
    padding: 8px 16px;
    background-color: #ff4d4f;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.clear-btn:hover {
    background-color: #e04344;
}

/* 像素画布 */
.pixel-canvas {
    background-color: #fff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: grid;
    /* 网格列数：20列（后续JS会动态设置，这里先占位） */
    grid-template-columns: repeat(20, 1fr);
    gap: 1px; /* 方格之间的间隙 */
}

/* 像素方格 */
.pixel {
    width: 20px;
    height: 20px;
    background-color: #fafafa;
    cursor: crosshair;
    transition: background-color 0.05s;
}

/* 提示文字 */
.tip {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}