/* ================================================================
   面试题页（interview）— 文档式三栏布局（分类 / 内容 / 题目列表）
   ================================================================ */

/* 本样式仅面试题页加载，锚点平滑滚动限定在该页 */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

/*
 * 修复：common.css 中 body { overflow-x: hidden } 会把 body 变成滚动容器，
 * 导致页内所有 position: sticky 失效（移动端题目列表吸顶、桌面端标题吸顶）。
 * overflow-x: clip 同样防止横向溢出，但不会形成滚动容器，sticky 恢复正常。
 * （用 body 上的页面 class 选择器，避免依赖 :has()，兼容老浏览器）
 */
body.page-interview-questions {
    overflow-x: clip;
}

/* ================================================================
   文档式固定布局（桌面端）：
   页面整体不滚动 —— 头部 / 底部备案条固定，左中右三栏各自独立滚动
   ================================================================ */
@media (min-width: 992px) {
    body.page-interview-questions {
        height: 100vh;
        overflow: hidden;
        display: flex;
        flex-direction: column;
    }

    .main.page-interview-questions {
        flex: 1;
        min-height: 0;
        padding: 10px 0;
        overflow: hidden;
        display: flex;
        flex-direction: column;
    }

    .page-interview-questions .iv-doc {
        flex: 1;
        min-height: 0;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        padding: 14px 18px;
    }

    .page-interview-questions .iv-tabs {
        flex: none;
    }

    .page-interview-questions .iv-doc-body {
        flex: 1;
        min-height: 0;
        align-items: stretch;
        /* 关键：显式把单行网格行高钉死为容器高度。
           不显式设置时，单行网格默认 auto 行高，部分浏览器会按内容最高项
           （内容区上万像素）撑高整行 → 三栏不再溢出、滚轮失效、点击定位偏移。
           minmax(0,1fr) 让行高=容器高且可收缩，配合子项 min-height:0 实现各自滚动。 */
        grid-template-rows: minmax(0, 1fr);
        overflow: hidden;
    }

    .page-interview-questions .iv-sidebar,
    .page-interview-questions .iv-content,
    .page-interview-questions .iv-toc {
        height: 100%;
        max-height: none;
        /* grid 子项默认最小高度为内容高度，不放开会把整行撑高、内部无法滚动 */
        min-height: 0;
    }

    .page-interview-questions .iv-content {
        overflow-y: auto;
        overscroll-behavior: contain;
        scroll-behavior: smooth;
        padding-top: 12px;
        padding-right: 10px;
        scrollbar-width: thin;
        scrollbar-color: rgba(93, 151, 67, 0.35) transparent;
    }

    .page-interview-questions .iv-content::-webkit-scrollbar {
        width: 6px;
    }

    .page-interview-questions .iv-content::-webkit-scrollbar-thumb {
        border-radius: 3px;
        background: rgba(93, 151, 67, 0.30);
    }

    .page-interview-questions .iv-toc-inner {
        height: 100%;
    }

    /* 题目标题栏钉在内容区顶部，卡片从其下方滚过 */
    .page-interview-questions .iv-questions-header {
        position: sticky;
        top: 0;
        z-index: 20;
        box-shadow: 0 12px 22px -10px rgba(93, 151, 67, 0.35);
    }

    .page-interview-questions .iv-question-card {
        scroll-margin-top: 72px;
    }

    /* 星级筛选条：桌面端在 flex 侧边栏中自然固定于顶部 */
    .page-interview-questions .iv-star-filter {
        flex: none;
    }

    /* 桌面端：分类导航在 flex 中滚动 */
    .page-interview-questions .iv-sidebar .iv-nav {
        flex: 1 1 auto;
        min-height: 0;
    }

    /* 底部备案条：固定布局下作为 flex 末项，不被拉伸、不留上边距；
       内部排版沿用全站统一的 .footer-single 样式，不再单独覆盖 */
    body.page-interview-questions .footer {
        flex: none;
        margin-top: 0;
    }
}

.iv-doc {
    padding-top: 0;
}

/* 方向 Tabs（服务端导航链接） */
.iv-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 4px;
    margin-bottom: 12px;
    border-radius: 10px;
    background: rgba(93, 151, 67, 0.07);
    border: 1px solid rgba(93, 151, 67, 0.13);
}

.iv-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 7px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.iv-tab:hover {
    color: var(--primary-color);
    background: rgba(255, 255, 255, 0.75);
}

.iv-tab--active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 3px 9px rgba(93, 151, 67, 0.30);
}

.iv-tab--active:hover {
    color: #fff;
    background: var(--primary-dark);
}

/* 三栏（宽屏）→ 双栏 → 单栏 */
.iv-doc-body {
    display: grid;
    grid-template-columns: 252px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}

@media (min-width: 1280px) {
    .iv-doc-body {
        grid-template-columns: 256px minmax(0, 1fr) 228px;
    }
}

/* 左侧导航：flex 竖排，顶部星级筛选固定、下方分类列表独立滚动 */
.iv-sidebar {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
    border-radius: var(--radius-md);
    border: 1px solid rgba(93, 151, 67, 0.13);
    /* 不透明白底：深色星空背景透上来会让文字发灰、对比度下降 */
    background: #ffffff;
    box-shadow: var(--shadow-sm);
}

/* ================================================================
   星级筛选条（固定在侧边栏顶部，不随下方分类列表滚动）
   ================================================================ */
.iv-star-filter {
    flex: none;
    padding: 8px 10px 8px;
    background: #ffffff;
    border-bottom: 1px solid rgba(93, 151, 67, 0.16);
}

.iv-star-filter-title {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-dark);
}

.iv-star-filter-icon {
    font-size: 12px;
}

.iv-star-filter-form {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px;
}

.iv-star-checkbox {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.iv-star-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.iv-star-label {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 5px;
    border: 1px solid rgba(93, 151, 67, 0.20);
    background: rgba(93, 151, 67, 0.05);
    color: #b8860b;
    font-size: 12px;
    letter-spacing: 1px;
    transition: all var(--transition-fast);
}

.iv-star-checkbox input[type="checkbox"]:checked + .iv-star-label {
    border-color: var(--primary-color);
    background: var(--primary-lighter);
    color: #b8860b;
    font-weight: 700;
    box-shadow: inset 0 0 0 1px var(--primary-color);
}

.iv-star-checkbox:hover .iv-star-label {
    border-color: var(--primary-color);
    background: rgba(93, 151, 67, 0.10);
}

.iv-star-filter-clear {
    margin-left: auto;
    padding: 2px 6px;
    border: none;
    background: none;
    color: var(--text-muted);
    font-size: 11px;
    cursor: pointer;
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.iv-star-filter-clear:hover {
    color: var(--primary-color);
}

.iv-star-filter-clear--hidden {
    display: none;
}

/* 分类导航：在侧边栏 flex 中占据剩余空间并独立滚动 */
.iv-sidebar .iv-nav {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 12px 12px;
    scrollbar-width: thin;
    scrollbar-color: rgba(93, 151, 67, 0.35) transparent;
}

/* 移动端分类折叠栏按钮（桌面端隐藏） */
.iv-sidebar-toggle {
    display: none;
}

.iv-sidebar .iv-nav::-webkit-scrollbar {
    width: 5px;
}

.iv-sidebar .iv-nav::-webkit-scrollbar-thumb {
    border-radius: 3px;
    background: rgba(93, 151, 67, 0.30);
}

.iv-sidebar::-webkit-scrollbar-thumb {
    border-radius: 3px;
    background: rgba(93, 151, 67, 0.30);
}

.iv-nav-group + .iv-nav-group {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px dashed rgba(93, 151, 67, 0.14);
}

/* 一级分类：浅绿底章节条，与二级菜单形成明显层级区分 */
.iv-nav-category {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    margin-bottom: 6px;
    padding: 8px 10px;
    border: 1px solid rgba(93, 151, 67, 0.14);
    border-radius: 8px;
    background: var(--primary-bg);
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--primary-dark);
    cursor: pointer;
    text-align: left;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.iv-nav-category:hover {
    background: var(--primary-lighter);
    border-color: rgba(93, 151, 67, 0.28);
}

/* 分类名前的绿色小方块标记 */
.iv-nav-category-text::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 8px;
    border-radius: 2px;
    background: var(--primary-color);
    vertical-align: 1px;
}

/* 收起状态：底色调灰，与展开态区分 */
.iv-nav-group--closed .iv-nav-category {
    background: #f5f7f3;
    border-color: rgba(0, 0, 0, 0.06);
    color: #5b5b5b;
}

.iv-nav-group--closed .iv-nav-category:hover {
    background: var(--primary-bg);
    color: var(--primary-dark);
}

.iv-nav-category-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.iv-nav-category-arrow {
    flex: none;
    width: 12px;
    height: 12px;
    position: relative;
    transition: transform var(--transition-fast);
}

.iv-nav-category-arrow::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 1px;
    width: 6px;
    height: 6px;
    border-right: 2px solid #8a8a8a;
    border-bottom: 2px solid #8a8a8a;
    transform: rotate(45deg);
}

/* 收起状态：箭头朝右 */
.iv-nav-group--closed .iv-nav-category-arrow {
    transform: rotate(-90deg);
}

.iv-nav-group--closed .iv-nav-category {
    margin-bottom: 0;
}

/* 二级列表：grid 行高动画平滑收展（不支持的浏览器退化为直接显隐） */
.iv-nav-list-wrap {
    display: grid;
    grid-template-rows: 1fr;
    overflow: hidden;
    transition: grid-template-rows 0.28s ease;
}

.iv-nav-group--closed .iv-nav-list-wrap {
    grid-template-rows: 0fr;
}

/* 二级菜单：树形缩进 + 左侧引导线，明显从属于一级分类 */
.iv-nav-list {
    min-height: 0;
    overflow: hidden;
    margin: 2px 4px 4px 12px;
    padding-left: 10px;
    border-left: 2px solid rgba(93, 151, 67, 0.16);
}

@media (prefers-reduced-motion: reduce) {
    .iv-nav-list-wrap {
        transition: none;
    }
}

.iv-nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    margin-bottom: 2px;
    border-radius: 7px;
    font-size: 13px;
    color: #555555;
    transition: color var(--transition-fast), background-color var(--transition-fast), padding-left var(--transition-fast);
}

.iv-nav-link:hover {
    color: var(--primary-dark);
    background: var(--primary-bg);
    padding-left: 14px;
}

.iv-nav-link--active {
    background: var(--primary-lighter);
    color: var(--primary-dark);
    font-weight: 700;
    box-shadow: inset 3px 0 0 var(--primary-color);
}

.iv-nav-link-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.iv-nav-link-count {
    flex: none;
    padding: 0 8px;
    border-radius: 999px;
    background: #edf3e8;
    color: #527034;
    font-size: 11px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.iv-nav-link--active .iv-nav-link-count {
    background: var(--primary-color);
    color: #fff;
}

/* 右侧内容 */
.iv-content {
    min-width: 0;
    padding-top: 8px;
}

/* 标题区：浅绿渐变卡片 + 图标章 */
.iv-questions-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    padding: 10px 16px;
    /* 上边贴齐内容区顶缘，去掉上圆角，仅保留下边圆角 */
    border-radius: 0 0 12px 12px;
    border: 1px solid rgba(93, 151, 67, 0.16);
    background: linear-gradient(120deg, var(--primary-bg) 0%, #ffffff 65%);
    box-shadow: 0 4px 14px -6px rgba(93, 151, 67, 0.20);
}

.iv-questions-title {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    min-width: 0;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: var(--text-primary);
}

/* 标题左侧图标章：绿色渐变圆角方块 */
.iv-questions-title::before {
    content: "📖";
    flex: none;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color) 60%, var(--primary-dark));
    box-shadow: 0 4px 10px rgba(93, 151, 67, 0.35);
    font-size: 16px;
}

.iv-questions-count {
    flex: none;
    padding: 3px 11px;
    border-radius: 999px;
    border: 1px solid rgba(93, 151, 67, 0.22);
    background: rgba(93, 151, 67, 0.08);
    color: var(--primary-dark);
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.02em;
    font-variant-numeric: tabular-nums;
}

/* ================================================================
   题目列表（TOC）
   ================================================================ */

/* 宽屏右侧栏 */
.iv-toc {
    display: none;
}

@media (min-width: 1280px) {
    .iv-toc {
        display: block;
    }
}

.iv-toc-inner {
    display: flex;
    flex-direction: column;
    max-height: inherit;
    border-radius: var(--radius-md);
    border: 1px solid rgba(93, 151, 67, 0.13);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.iv-toc-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: none;
    padding: 10px 14px 8px;
    border-bottom: 1px solid rgba(93, 151, 67, 0.14);
    background: rgba(93, 151, 67, 0.05);
}

.iv-toc-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--primary-dark);
}

.iv-toc-count {
    padding: 1px 9px;
    border-radius: 999px;
    background: rgba(93, 151, 67, 0.14);
    color: var(--primary-dark);
    font-size: 11px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.iv-toc-nav {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 8px;
    scrollbar-width: thin;
    scrollbar-color: rgba(93, 151, 67, 0.35) transparent;
}

.iv-toc-nav::-webkit-scrollbar {
    width: 5px;
}

.iv-toc-nav::-webkit-scrollbar-thumb {
    border-radius: 3px;
    background: rgba(93, 151, 67, 0.30);
}

.iv-toc-link {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 7px 9px;
    margin-bottom: 1px;
    border-radius: 7px;
    font-size: 13px;
    line-height: 1.55;
    color: #454545;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.iv-toc-link:hover {
    color: var(--primary-dark);
    background: var(--primary-bg);
}

.iv-toc-link--active {
    color: var(--primary-dark);
    font-weight: 700;
    background: var(--primary-lighter);
    box-shadow: inset 3px 0 0 var(--primary-color);
}

.iv-toc-index {
    flex: none;
    min-width: 20px;
    margin-top: 1px;
    text-align: right;
    color: var(--primary-color);
    font-size: 11.5px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.iv-toc-index::after {
    content: ".";
}

.iv-toc-text {
    flex: 1;
    min-width: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

/* 窄屏折叠题目列表 */
.iv-toc-mobile {
    margin-bottom: 10px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(93, 151, 67, 0.16);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

@media (min-width: 1280px) {
    .iv-toc-mobile {
        display: none;
    }
}

.iv-toc-mobile-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--primary-dark);
    cursor: pointer;
    user-select: none;
    list-style: none;
    transition: background-color var(--transition-fast);
}

.iv-toc-mobile-summary::-webkit-details-marker {
    display: none;
}

.iv-toc-mobile-summary::after {
    content: "▸";
    font-size: 12px;
    transition: transform var(--transition-fast);
}

.iv-toc-mobile[open] .iv-toc-mobile-summary::after {
    transform: rotate(90deg);
}

.iv-toc-mobile-summary:hover {
    background: rgba(93, 151, 67, 0.06);
}

.iv-toc-mobile-count {
    margin-left: auto;
    margin-right: 10px;
    padding: 1px 9px;
    border-radius: 999px;
    background: rgba(93, 151, 67, 0.14);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
}

.iv-toc-nav--mobile {
    max-height: 320px;
    border-top: 1px solid rgba(93, 151, 67, 0.12);
}

/* 占位 */
.iv-placeholder {
    padding: 70px 20px;
    text-align: center;
    border: 1.5px dashed rgba(93, 151, 67, 0.30);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.55);
    color: var(--text-muted);
    font-size: 14px;
}

.iv-placeholder-icon {
    display: block;
    margin-bottom: 12px;
    font-size: 46px;
    animation: floatY 3.2s ease-in-out infinite;
}

/* 题目卡片 */
.iv-question-card {
    position: relative;
    padding: 18px 22px;
    margin-bottom: 12px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(93, 151, 67, 0.12);
    /* 接近不透明：深色星空背景透上来会让正文发灰 */
    background: rgba(255, 255, 255, 0.97);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    /* 注意：不要用 content-visibility:auto 做屏外跳过渲染。
       它让屏外卡片按 contain-intrinsic-size 估算高度（远小于真实高度），
       滚动时才按真实高度渲染 → scrollHeight 持续暴涨 → 锚点/目录定位严重偏移，
       越靠下的题目偏差越大。为保证定位准确，卡片一律按真实高度即时渲染。 */
    /* 锚点跳转时避开吸顶头部 */
    scroll-margin-top: calc(var(--header-height) + 14px);
}

.iv-question-card:hover {
    border-color: rgba(93, 151, 67, 0.28);
    box-shadow: 0 10px 26px rgba(93, 151, 67, 0.10);
}

/* 定位高亮（TOC 点击 / 直达链接） */
.iv-question-card--flash {
    animation: ivCardFlash 1.8s ease-out;
}

@keyframes ivCardFlash {
    0% {
        border-color: var(--primary-color);
        box-shadow: 0 0 0 4px rgba(93, 151, 67, 0.30), 0 12px 30px rgba(93, 151, 67, 0.16);
        background: rgba(248, 251, 244, 0.98);
    }
    100% {
        box-shadow: var(--shadow-sm);
    }
}

@media (prefers-reduced-motion: reduce) {
    .iv-question-card--flash {
        animation: none;
        border-color: var(--primary-color);
    }
}

/* 卡片锚点按钮（hover 显示） */
.iv-question-anchor {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 7px;
    font-size: 14px;
    font-weight: 700;
    color: var(--primary-color);
    background: rgba(93, 151, 67, 0.10);
    opacity: 0;
    transition: opacity var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.iv-question-card:hover .iv-question-anchor,
.iv-question-anchor:focus-visible {
    opacity: 1;
}

.iv-question-anchor:hover {
    background: var(--primary-color);
    color: #fff;
}

.iv-question-header {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin-bottom: 6px;
}

.iv-question-star {
    flex: none;
    margin-top: 3px;
    color: #eab308;
    font-size: 14px;
    letter-spacing: 2px;
    text-shadow: 0 1px 2px rgba(234, 179, 8, 0.30);
}

.iv-question-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.65;
    color: var(--text-primary);
}

.iv-question-index {
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
}

/* 题目分节 */
.iv-section {
    margin-top: 12px;
    padding: 12px 16px;
    border-radius: 9px;
    border: 1px solid rgba(93, 151, 67, 0.12);
    background: rgba(93, 151, 67, 0.045);
}

/* 示例代码节：深色独立模块，与浅色卡片正文形成对比 */
.iv-section--code {
    background: #282c34;
    border-color: rgba(0, 0, 0, 0.18);
}

.iv-section-label {
    display: inline-block;
    margin-bottom: 10px;
    padding: 2px 12px;
    border-radius: 999px;
    background: rgba(93, 151, 67, 0.13);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

/* 富文本排版（API 返回的 HTML，元素不可控，需兜底全覆盖） */
.iv-section-body {
    font-size: 14px;
    line-height: 1.95;
    color: var(--text-secondary);
    word-break: break-word;
    overflow-wrap: break-word;
}

.iv-section-body > *:first-child {
    margin-top: 0;
}

.iv-section-body > *:last-child {
    margin-bottom: 0;
}

.iv-section-body p {
    margin-bottom: 10px;
}

.iv-section-body p:last-child {
    margin-bottom: 0;
}

.iv-section-body h1,
.iv-section-body h2,
.iv-section-body h3,
.iv-section-body h4,
.iv-section-body h5,
.iv-section-body h6 {
    margin: 14px 0 8px;
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.5;
}

/* h1/h2 必须显式限定字号，否则按浏览器默认大小渲染 */
.iv-section-body h1 { font-size: 16.5px; }
.iv-section-body h2 { font-size: 16px; }
.iv-section-body h3 { font-size: 15.5px; }
.iv-section-body h4 { font-size: 14.5px; }
.iv-section-body h5,
.iv-section-body h6 { font-size: 14px; }

.iv-section-body ul,
.iv-section-body ol {
    margin: 8px 0 10px;
    padding-left: 22px;
    list-style: disc;
}

.iv-section-body ol {
    list-style: decimal;
}

.iv-section-body li {
    margin-bottom: 5px;
    padding-left: 4px;
}

.iv-section-body li::marker {
    color: var(--primary-color);
}

.iv-section-body strong {
    color: var(--primary-dark);
}

/* 代码高亮：使用 atom-one-dark 深色主题，由 highlight.js 插件渲染 */
/* 为带复制按钮的 pre 提供定位上下文与独立边框 */
.iv-pre--copyable {
    position: relative;
    margin: 10px 0;
    padding: 28px 16px 14px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: #282c34;
    overflow-x: auto;
}

/* macOS 风格左上红黄绿三色圆点 */
.iv-pre--copyable::before {
    content: "";
    position: absolute;
    top: 10px;
    left: 14px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: #ff5f57;
    box-shadow: 18px 0 0 #febc2e, 36px 0 0 #28c840;
}

/* 复制按钮样式（深色背景适配版） */
.iv-section-body .copy-code-btn {
    position: absolute;
    top: 8px;
    right: 10px;
    z-index: 1;
    padding: 4px 9px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.08);
    color: #abb2bf;
    font-size: 12px;
    line-height: 1.4;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.iv-section-body .copy-code-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

/* 图片 / 媒体：任何尺寸都不溢出卡片 */
.iv-section-body img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 10px auto;
    border-radius: 8px;
}

.iv-section-body iframe,
.iv-section-body video,
.iv-section-body embed,
.iv-section-body object {
    max-width: 100%;
}

/* 表格：块级 + 横向滚动，宽表任何屏幕都不撑破布局 */
.iv-section-body table {
    display: block;
    width: 100%;
    max-width: 100%;
    margin: 10px 0;
    border-collapse: collapse;
    font-size: 13px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.iv-section-body th,
.iv-section-body td {
    padding: 8px 12px;
    border: 1px solid rgba(93, 151, 67, 0.18);
    text-align: left;
    line-height: 1.7;
}

.iv-section-body th {
    background: var(--primary-lighter);
    color: var(--primary-dark);
    font-weight: 700;
}

.iv-section-body blockquote {
    margin: 10px 0;
    padding: 10px 16px;
    border-left: 3px solid var(--primary-color);
    border-radius: 0 7px 7px 0;
    background: rgba(93, 151, 67, 0.07);
    color: var(--text-secondary);
}

.iv-section-body a {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 3px;
    /* 长 URL 强制断行，防止溢出 */
    overflow-wrap: anywhere;
    word-break: break-all;
}

.iv-section-body hr {
    margin: 14px 0;
    border: none;
    border-top: 1px dashed rgba(93, 151, 67, 0.28);
}

.iv-section-body dt {
    font-weight: 700;
    color: var(--text-primary);
}

.iv-section-body dd {
    margin: 0 0 8px 20px;
}

.iv-section-body mark {
    padding: 0 3px;
    border-radius: 3px;
    background: rgba(234, 179, 8, 0.28);
}

/* 题目标题里的行内代码（titleHtml 为 HTML） */
.iv-question-title code {
    padding: 1px 6px;
    border-radius: 5px;
    background: rgba(93, 151, 67, 0.12);
    font-family: ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;
    font-size: 0.82em;
    color: var(--primary-dark);
    word-break: break-all;
}

/* ================================================================
   题目列表吸顶（< 1280px 均生效）
   ================================================================ */
@media (max-width: 1279px) {
    .iv-toc-mobile {
        position: sticky;
        z-index: 30;
        background: rgba(255, 255, 255, 0.96);
        -webkit-backdrop-filter: blur(8px);
        backdrop-filter: blur(8px);
        box-shadow: 0 10px 20px -10px rgba(93, 151, 67, 0.35);
    }

    /* 展开面板不超过半屏，内部滚动 */
    .iv-toc-nav--mobile {
        max-height: min(320px, 45vh);
    }
}

/* 响应式 */
@media (max-width: 991px) {
    .iv-doc-body {
        grid-template-columns: 1fr;
    }

    /* 分类导航折叠为一条栏：默认只显示当前小类，点击展开 */
    .iv-sidebar {
        position: static;
        max-height: none;
        overflow: visible;
    }

    /* 星级筛选条：移动端改为顶部吸顶 */
    .iv-star-filter {
        position: sticky;
        top: calc(var(--header-height) + 6px);
        z-index: 30;
        margin: 0;
        padding: 6px 10px;
        background: rgba(255, 255, 255, 0.96);
        -webkit-backdrop-filter: blur(8px);
        backdrop-filter: blur(8px);
        box-shadow: 0 6px 14px -8px rgba(93, 151, 67, 0.35);
    }

    .iv-sidebar-toggle {
        display: flex;
        align-items: center;
        gap: 8px;
        width: 100%;
        padding: 10px 13px;
        border-radius: 9px;
        border: 1px solid rgba(93, 151, 67, 0.22);
        background: rgba(93, 151, 67, 0.07);
        color: var(--primary-dark);
        font-size: 13.5px;
        font-weight: 600;
        font-family: inherit;
        cursor: pointer;
        transition: background-color var(--transition-fast);
    }

    .iv-sidebar-toggle:active {
        background: rgba(93, 151, 67, 0.14);
    }

    .iv-sidebar-toggle-label {
        flex: none;
    }

    .iv-sidebar-toggle-current {
        flex: 1;
        min-width: 0;
        margin-left: auto;
        padding: 2px 10px;
        border-radius: 999px;
        background: var(--primary-color);
        color: #fff;
        font-size: 11.5px;
        font-weight: 700;
        text-align: center;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .iv-sidebar-toggle-arrow {
        flex: none;
        width: 14px;
        height: 14px;
        position: relative;
        transition: transform var(--transition-fast);
    }

    .iv-sidebar-toggle-arrow::before {
        content: "";
        position: absolute;
        left: 4px;
        top: 2px;
        width: 7px;
        height: 7px;
        border-right: 2px solid var(--primary-dark);
        border-bottom: 2px solid var(--primary-dark);
        transform: rotate(45deg);
    }

    .iv-sidebar--open .iv-sidebar-toggle-arrow {
        transform: rotate(90deg);
    }

    /* 折叠状态：导航列表隐藏 */
    .iv-nav {
        display: none;
    }

    .iv-sidebar--open .iv-nav {
        display: block;
        margin-top: 10px;
        padding-top: 10px;
        border-top: 1px dashed rgba(93, 151, 67, 0.20);
        max-height: 52vh;
        overflow-y: auto;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
    }

    .iv-nav-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0 10px;
    }

    /* 页面滚动：题目列表钉在站点头部下方 */
    .iv-toc-mobile {
        top: calc(var(--header-height) + 6px);
    }

    /* 锚点跳转时避开站点头部 + 吸顶题目列表 */
    .iv-question-card {
        scroll-margin-top: calc(var(--header-height) + 64px);
    }
}

/* 容器滚动（992–1279px）：题目列表钉在吸顶标题栏下方 */
@media (min-width: 992px) and (max-width: 1279px) {
    .iv-toc-mobile {
        top: 50px;
    }

    .page-interview-questions .iv-question-card {
        scroll-margin-top: 118px;
    }
}

@media (max-width: 767px) {
    .iv-tabs {
        display: flex;
    }

    .iv-tab {
        flex: 1;
        justify-content: center;
        padding: 6px 10px;
        font-size: 12.5px;
        white-space: nowrap;
    }

    .iv-nav-list {
        grid-template-columns: 1fr;
    }

    /* 星级筛选：移动端紧凑排列 */
    .iv-star-filter {
        padding: 5px 8px;
    }

    .iv-star-filter-title {
        margin-bottom: 4px;
        font-size: 11px;
    }

    .iv-star-filter-form {
        gap: 3px;
    }

    .iv-star-label {
        padding: 2px 6px;
        font-size: 11px;
    }

    .iv-star-filter-clear {
        font-size: 10px;
    }

    .iv-question-card {
        padding: 18px 16px;
    }

    .iv-question-anchor {
        opacity: 1;
    }

    /* 标题给常驻的 # 锚点按钮让位，避免遮挡 */
    .iv-question-header {
        padding-right: 32px;
    }

    .iv-questions-title {
        font-size: 17px;
    }

    /* 长代码块平滑横向滚动 */
    .iv-section-body pre {
        -webkit-overflow-scrolling: touch;
    }

    /* 移动端正文紧凑排版 */
    .iv-section-body {
        font-size: 13.5px;
        line-height: 1.85;
    }

    .iv-section-body ul,
    .iv-section-body ol {
        padding-left: 18px;
    }

    .iv-section-body .iv-pre--copyable {
        padding: 12px 13px;
    }
}

@media (max-width: 479px) {
    .iv-tabs {
        width: 100%;
    }

    .iv-tab {
        padding: 6px 6px;
        font-size: 12px;
    }

    .iv-questions-header {
        flex-wrap: wrap;
        gap: 8px;
    }
}