.sticky {
    position: sticky;
    top: 0;
    max-height: 100vh;
}

.toggle-nav-sidebar {
    z-index: 20;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 23px;
    width: 23px;
    border: 0;
    border-right: 1px solid var(--hairline-color);
    background-color: var(--body-bg);
    cursor: pointer;
    font-size: 1.25rem;
    color: var(--link-fg);
    padding: 0;
}

[dir="rtl"] .toggle-nav-sidebar {
    border-left: 1px solid var(--hairline-color);
    border-right: 0;
}

.toggle-nav-sidebar:hover,
.toggle-nav-sidebar:focus {
    background-color: var(--darkened-bg);
}

#nav-sidebar {
    z-index: 15;
    flex: 0 0 220px;
    left: -221px;
    margin-left: -221px;
    border-top: 1px solid transparent;
    border-right: 1px solid var(--hairline-color);
    background-color: var(--body-bg);
    overflow: auto;
}

[dir="rtl"] #nav-sidebar {
    border-left: 1px solid var(--hairline-color);
    border-right: 0;
    left: 0;
    margin-left: 0;
    right: -221px;
    margin-right: -221px;
}

.toggle-nav-sidebar::before {
    content: '\00BB';
}

.main.shifted .toggle-nav-sidebar::before {
    content: '\00AB';
}

.main > #nav-sidebar {
    visibility: hidden;
}

.main.shifted > #nav-sidebar {
    margin-left: 0;
    visibility: visible;
}

[dir="rtl"] .main.shifted > #nav-sidebar {
    margin-right: 0;
}

#nav-sidebar .module th {
    width: 100%;
    overflow-wrap: anywhere;
}

#nav-sidebar .module th,
#nav-sidebar .module caption {
    padding-left: 16px;
}

#nav-sidebar .module td {
    white-space: nowrap;
}

[dir="rtl"] #nav-sidebar .module th,
[dir="rtl"] #nav-sidebar .module caption {
    padding-left: 8px;
    padding-right: 16px;
}

#nav-sidebar .current-app .section:link,
#nav-sidebar .current-app .section:visited {
    color: var(--header-color);
    font-weight: bold;
}

#nav-sidebar .current-model {
    background: var(--selected-row);
}

@media (forced-colors: active) {
    #nav-sidebar .current-model {
        background-color: SelectedItem;
    }
}

.main > #nav-sidebar + .content {
    max-width: calc(100% - 23px);
}

.main.shifted > #nav-sidebar + .content {
    max-width: calc(100% - 244px);
}

/* 手机端响应式设计 - 使用覆盖式侧边栏 */
@media (max-width: 767px) {
    /* 重置桌面端的侧边栏样式 */
    #nav-sidebar {
        position: fixed;
        top: 56px;
        left: -220px;
        width: 220px;
        height: calc(100vh - 56px);
        z-index: 1000;
        background-color: var(--body-bg);
        border-right: 1px solid var(--hairline-color);
        box-shadow: 2px 0 8px rgba(0, 0, 0, 0.15);
        transition: left 0.3s ease;
        margin-left: 0;
    }

    /* 侧边栏展开时，覆盖整个左侧区域 */
    #nav-sidebar.mobile-open {
        left: 0;
    }

    /* 切换按钮在侧边栏关闭时可见，打开时隐藏 */
    .toggle-nav-sidebar {
        display: flex !important;
        position: fixed;
        left: 0;
        top: 56px;
        height: 40px;
        width: 40px;
        z-index: 1002;
        background: var(--body-bg);
        border: 1px solid var(--hairline-color);
        border-radius: 0 0 8px 0;
        box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.1);
        margin-top: 10px;
    }

    /* 当侧边栏打开时，切换按钮移到侧边栏内部右侧 */
    #nav-sidebar.mobile-open ~ .toggle-nav-sidebar,
    #nav-sidebar.mobile-open + .toggle-nav-sidebar {
        left: 180px;
        z-index: 1001;
    }

    /* 在侧边栏打开时，显示一个关闭按钮在侧边栏内部 */
    #nav-sidebar::before {
        content: '×';
        position: absolute;
        right: 10px;
        top: 10px;
        font-size: 24px;
        font-weight: bold;
        cursor: pointer;
        z-index: 1002;
        color: var(--link-fg);
        display: none;
        transition: color 0.2s ease;
    }

    #nav-sidebar.mobile-open::before {
        display: block;
    }

    #nav-sidebar::before:hover {
        color: var(--header-color);
    }

    /* 为侧边栏添加关闭按钮点击事件 */
    #nav-sidebar.closeable::before {
        display: block;
    }

    .main.shifted > #nav-sidebar {
        left: 0;
    }

    .main > #nav-sidebar + .content,
    .main.shifted > #nav-sidebar + .content {
        max-width: 100%;
    }

    /* 添加遮罩层 */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .sidebar-overlay.active {
        display: block;
    }
}

#nav-filter {
    width: 100%;
    box-sizing: border-box;
    padding: 2px 5px;
    margin: 5px 0;
    border: 1px solid var(--border-color);
    background-color: var(--darkened-bg);
    color: var(--body-fg);
}

#nav-filter:focus {
    border-color: var(--body-quiet-color);
}

#nav-filter.no-results {
    background: var(--message-error-bg);
}

#nav-sidebar table {
    width: 100%;
}