/* 悬停效果 */
.nav-highlight:hover {
    opacity: 0.8;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
       /* 背景装饰 - 淡淡的“悟”字 */
        .bg-text {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -10%;
            font-weight: bold;
        }
               /* 背景装饰 - 淡淡的“2”字 */
        .bg-text1 {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -50%;
            font-weight: bold;
        }
                .bg-text2 {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -100%;
            font-weight: bold;
        }
                .bg-text3 {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -150%;
            font-weight: bold;
        }
                   .bg-text4 {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -200%;
            font-weight: bold;
        }
                   .bg-text5 {
            position: absolute;
            font-size: 30vh;
            color: rgba(0, 0, 0, 0.02); /* 极其淡 */
            z-index: 0;
            user-select: none;
            right: 80%;
            bottom: -250%;
            font-weight: bold;
        }