/* 学生端共享侧边栏 */
aside {
    display: block;
    margin: 0;
    padding: 0;
}

.brand-logo-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    flex: 0 0 auto;
}

aside.sidebar {
    position: fixed !important;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-w);
    background: #fff;
    border-right: 1px solid #edf0f6;
    padding: 18px 0;
    z-index: 100;
    overflow-y: auto;
    display: block !important;
    box-shadow: 6px 0 24px rgba(25, 34, 68, .04);
}

aside.sidebar .logo {
    display: flex !important;
    align-items: center;
    gap: 10px;
    min-height: 48px;
    padding: 0 22px 22px;
    font-size: 19px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

aside.sidebar .nav-item {
    position: relative;
    display: flex !important;
    align-items: center;
    gap: 14px;
    min-height: 58px;
    margin: 4px 12px;
    padding: 0 18px;
    border-radius: 14px;
    color: #4d5261;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: color .16s ease, background .16s ease, box-shadow .16s ease;
    text-decoration: none;
}

aside.sidebar .nav-item::after {
    content: "";
    position: absolute;
    right: -12px;
    top: 12px;
    bottom: 12px;
    width: 4px;
    border-radius: 4px 0 0 4px;
    background: transparent;
}

aside.sidebar .nav-item:hover {
    background: #f7f6ff;
    color: var(--primary);
}

aside.sidebar .nav-item.active {
    background: #f0edff;
    color: var(--primary);
    box-shadow: inset 0 0 0 1px rgba(108, 92, 231, .08);
}

aside.sidebar .nav-item.active::after {
    background: var(--primary);
}

aside.sidebar .nav-item i {
    width: 28px;
    min-width: 28px;
    text-align: center;
    font-size: 22px;
    line-height: 1;
    color: #6f7482;
}

aside.sidebar .nav-item:hover i,
aside.sidebar .nav-item.active i {
    color: var(--primary);
}

aside.sidebar .nav-label {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 8px;
    left: 16px;
    z-index: 101;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .28s ease, visibility 0s linear .28s;
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity .28s ease;
}

@media (max-width: 1023px) {
    .mobile-menu-btn {
        display: block;
    }

    aside.sidebar {
        transform: translateX(-100%);
        transition: transform .34s cubic-bezier(.22, 1, .36, 1), box-shadow .34s ease;
        width: 280px;
        box-shadow: 2px 0 12px rgba(0,0,0,.1);
        z-index: 101;
        overflow-y: auto;
        will-change: transform;
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
        transform-style: preserve-3d;
    }

    aside.sidebar.open {
        transform: translateX(0);
    }
}

@media (max-width: 767px) {
    aside.sidebar .logo {
        padding: 0 18px 18px;
        font-size: 17px;
    }

    aside.sidebar .nav-item {
        min-height: 56px;
        margin: 4px 10px;
        padding: 0 16px;
        font-size: 15px;
    }

    aside.sidebar .nav-item i {
        width: 26px;
        min-width: 26px;
        font-size: 20px;
    }

    .mobile-menu-btn {
        top: 8px;
        left: 16px;
        width: 44px;
        height: 44px;
    }
}