/* 网格背景样式 - 仅设置背景，不影响布局 */
body {
    background-color: white;
    background-image: 
        linear-gradient(to right, #c5c5c53b 1px, transparent 1px),
        linear-gradient(to bottom, #c5c5c53b 1px, transparent 1px);
    background-size: 2.5vw 2.5vw;
    background-attachment: scroll; /* 固定背景，滚动时不移动 */
} 

[data-theme='dark'] body {
    background-color: #2c2c2c;
    background-image: 
        linear-gradient(to right, #6464641f 1px, transparent 1px),
        linear-gradient(to bottom, #6464641f 1px, transparent 1px);
}