@media screen and (min-width: 1300px) {

    /* 这里放入你原本用于控制侧边栏悬浮、隐藏、滚动的代码 */
    
    .md-sidebar--primary {
        position: fixed !important;
        top: 10px !important;
        left: 0 !important;
        width: 300px !important;
        height: calc(100vh - 60px) !important;
        padding-left: 30px !important;
        border-right: none !important;
        overflow-y: auto !important;
        z-index: 60 !important;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.1s ease-in-out, visibility 0.1s;
    }

    body.sidebar-ready .md-sidebar--primary {
        opacity: 1;
        visibility: visible;
    }

    .md-sidebar--primary::after {
        content: "";
        position: absolute;
        right: 0;
        top: 50px;
        bottom: 0;
        width: 1px;
        background-color: #e9ecef;
        pointer-events: none;
    }

    .md-sidebar--primary .md-sidebar__scrollwrap::-webkit-scrollbar {
        width: 6px;
    }

    .md-sidebar--primary .md-sidebar__scrollwrap::-webkit-scrollbar-track {
        background: #f1f1f1;
    }

    .md-sidebar--primary .md-sidebar__scrollwrap::-webkit-scrollbar-thumb {
        background: #ccc;
        border-radius: 4px;
    }

    .md-sidebar--primary .md-sidebar__scrollwrap {
        scrollbar-color: #ccc #f1f1f1;
        scrollbar-width: thin;
        height: 100% !important;
        padding-bottom: 0 !important;
    }

    /* 
       !!! 特别注意 !!!
       下面这段就是导致手机端菜单空白的罪魁祸首 
       现在把它包在 min-width: 1300px 里，手机端就不会生效了，菜单就会出来了
    */
    .md-nav--primary > .md-nav__list > .md-nav__item {
        display: none !important;
    }

    body.show-all-nav .md-nav--primary > .md-nav__list > .md-nav__item {
        display: block !important;
    }

    body.show-category .md-nav--primary > .md-nav__list > .md-nav__item.category-active {
        display: block !important;
    }

    .md-nav--primary > .md-nav__list {
        padding-left: 0 !important;
    }

    .md-nav--primary > .md-nav__list > .md-nav__item {
        border-left: none !important;
    }

    .md-nav--primary .md-nav__list .md-nav__list {
        border-left: none !important;
        margin-left: 18px !important;
        padding-left: 0 !important;
        display: block !important;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__item {
        position: relative !important;
        border-left: 1px solid #e0e0e0 !important;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__item::before {
        content: "";
        position: absolute;
        top: 16px;
        left: 0;
        width: 12px;
        height: 1px;
        background-color: #e0e0e0;
        z-index: 1;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__item:last-child {
        border-left-color: transparent !important;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__item:last-child::after {
        content: "";
        position: absolute;
        z-index: 1;
        top: 0;
        left: -1px;
        width: 1px;
        height: 17px;
        background-color: #e0e0e0;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__link {
        padding-left: 20px !important;
    }

    .md-nav--primary .md-nav__list .md-nav__list .md-nav__list {
        margin-left: 18px !important;
    }
    
    /* 
       这里还可以加入其他你只希望在电脑端显示的样式 
       例如自定义的 sidebar toggle 按钮逻辑等
    */
} 

@media (min-width: 1301px) {
    .md-main {
        margin-left: 310px !important;
    }
}

@media (max-width: 1300px) {
    .md-main {
        margin-left: 0 !important;
    }
}

#sidebar-toggle {
    position: fixed;
    top: 50%;
    left: 300px;
    transform: translateY(-50%);
    width: 24px;
    height: 48px;
    background-color: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-left: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 101;
    transition: left 0.3s;
}

@media (max-width: 1300px) {
    #sidebar-toggle {
        display: none !important;
    }
}

body.sidebar-collapsed .md-sidebar--primary {
    transform: translateX(-100%);
}

body.sidebar-collapsed .md-main {
    margin-left: 0 !important;
}

body.sidebar-collapsed #sidebar-toggle {
    left: 0;
}

body.sidebar-collapsed #sidebar-toggle svg {
    transform: rotate(180deg);
}

.md-nav__link {
    color: #1f2937 !important;
    font-size: 15px !important;
    margin-right: 10px;
    font-weight: 435 !important;
}

.md-nav__link:hover {
    color: #4d80f0 !important;
    background-color: rgba(0, 0, 0, 0.04);
}

.md-nav__item--active > .md-nav__link,
.md-nav__link--active {
    color: #009485 !important;
    font-weight: 600 !important;
    background: transparent !important;
}

/* ==========================================================================
   修复手机端侧边栏被头部遮挡的问题
   ========================================================================== */
@media screen and (max-width: 1300px) {
    
    .md-sidebar--primary {
        z-index: 200 !important; 
        top: 0 !important;
        height: 100vh !important;
    }


    .md-overlay {
        z-index: 150 !important;
    }
}

.md-nav--primary .md-nav__title {
    cursor: pointer !important; /* 鼠标放上去变小手 */
    transition: color 0.2s ease;
}

/* 鼠标悬停时变色 (维控绿) */
.md-nav--primary .md-nav__title:hover {
    color: #009485 !important; 
    opacity: 0.8;
}