nav{
    /* ... 其他属性 ... */
    font-family: 'MyMenuFont', sans-serif;
}
.cursor {
    position: fixed; width:6px; height:6px;
    background:rgba(255,255,255,0.9); border-radius:50%;
    pointer-events:none; mix-blend-mode:difference;
    z-index:9999; will-change:transform; transform:translateZ(0);
}
.cursor.hover {transform:scale(1.6); background:rgba(255,255,255,0.4);}
.cursor-trail {
    position:fixed; width:18px; height:18px;
    background:rgba(255,255,255,0.08); border-radius:50%;
    pointer-events:none; z-index:9998; will-change:transform; transform:translateZ(0);
}

/* 全局鼠标隐藏（原代码里的cursor: none） */
* {
    cursor: none;
}