/* 全屏固定背景 */
body {
    background-image: url("https://img2024.cnblogs.com/blog/3525128/202506/3525128-20250609202522476-863084294.jpg");
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    background-color: #000; /* 备用深色背景 */
}

/* 若需透明效果（适用于特定主题） */
#home {
    opacity: 0.9; /* 调整透明度 */
}