/*
Theme Name: Q&A Modern
Theme URI: https://server.xymww.com
Author: AI Developer
Author URI: https://server.xymww.com
Description: 简约、易读、适合技术知识内容的响应式 WordPress 主题。
Version: 1.1.0
Requires at least: 5.0
Tested up to: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: qa-modern
Tags: 问答, 现代化, 响应式, 技术文章
*/

/* =========================================================
   1. 全局基础
   ========================================================= */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #eff6ff;
    --secondary-color: #64748b;
    --background-color: #f5f7fb;
    --card-background: #ffffff;
    --text-color: #172033;
    --text-light: #64748b;
    --border-color: #e5eaf1;
    --border-strong: #d5deea;
    --success-color: #15803d;
    --warning-color: #b45309;
    --danger-color: #b91c1c;
    --shadow-sm: 0 2px 8px rgb(15 23 42 / 0.04);
    --shadow: 0 8px 24px rgb(15 23 42 / 0.06);
    --shadow-hover: 0 14px 32px rgb(15 23 42 / 0.09);
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 18px;
    --content-width: 820px;
    --site-width: 1160px;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
}

html {
    box-sizing: border-box;
    scroll-behavior: smooth;
    scroll-padding-top: 24px;
    -webkit-text-size-adjust: 100%;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

body {
    margin: 0;
    min-width: 320px;
    background: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img,
picture,
video,
iframe,
svg {
    max-width: 100%;
}

img {
    height: auto;
    vertical-align: middle;
}

button,
input,
select,
textarea {
    max-width: 100%;
    font: inherit;
}

button,
input[type="button"],
input[type="submit"] {
    cursor: pointer;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

a:hover {
    color: var(--primary-hover);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid rgb(37 99 235 / .35);
    outline-offset: 3px;
    border-radius: 4px;
}

::selection {
    color: #fff;
    background: var(--primary-color);
}

.container {
    width: min(var(--site-width), calc(100% - 40px));
    margin-right: auto;
    margin-left: auto;
}

.site-main {
    min-height: 55vh;
}

/* 无障碍：屏幕阅读器文本与键盘跳转链接 */
.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link:focus,
.skip-link:active {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 99999;
    width: auto;
    height: auto;
    padding: 10px 16px;
    margin: 0;
    overflow: visible;
    clip: auto;
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text-color);
    box-shadow: var(--shadow);
    font-weight: 700;
    white-space: normal;
}

#primary-content {
    scroll-margin-top: 24px;
}

/* =========================================================
   2. 页头与导航
   ========================================================= */
.site-header {
    position: relative;
    z-index: 20;
    margin-bottom: 30px;
    padding: 17px 0;
    background: rgb(255 255 255 / .96);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgb(15 23 42 / .025);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.site-branding {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    min-width: 0;
}

.site-title {
    margin: 0;
    font-size: 1.45rem;
    font-weight: 750;
    line-height: 1.3;
    letter-spacing: -.035em;
}

.site-title a {
    color: var(--text-color);
}

.site-title a:hover {
    color: var(--primary-color);
}

.custom-logo-link {
    display: inline-flex;
    align-items: center;
}

.custom-logo {
    width: auto;
    max-height: 54px;
}

.main-navigation {
    min-width: 0;
}

.nav-menu {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 7px 22px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-menu li {
    margin: 0;
    padding: 0;
}

.nav-menu a {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 42px;
    padding: 7px 1px;
    color: #475569;
    font-size: .94rem;
    font-weight: 600;
}

.nav-menu a::after {
    position: absolute;
    right: 0;
    bottom: 2px;
    left: 0;
    height: 2px;
    background: var(--primary-color);
    content: "";
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform .2s ease;
}

.nav-menu a:hover,
.nav-menu .current-menu-item > a,
.nav-menu .current_page_item > a {
    color: var(--primary-color);
}

.nav-menu a:hover::after,
.nav-menu .current-menu-item > a::after,
.nav-menu .current_page_item > a::after {
    transform: scaleX(1);
}

/* =========================================================
   3. 面包屑
   ========================================================= */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 9px;
    margin: 0 0 20px;
    padding: 0;
    color: var(--text-light);
    font-size: .86rem;
    line-height: 1.6;
}

.breadcrumb a {
    color: #64748b;
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

.breadcrumb span[aria-current="page"] {
    color: #334155;
    font-weight: 600;
}

/* =========================================================
   4. 首页知识门户 / 分类 / 内容区块
   以下类名供首页模板使用
   ========================================================= */
.home-hero {
    margin: 0 0 30px;
    padding: clamp(26px, 5vw, 54px);
    overflow: hidden;
    background: linear-gradient(125deg, #102b55 0%, #1d4f91 58%, #2563eb 100%);
    border-radius: var(--radius-lg);
    color: #fff;
}

.home-hero h1,
.home-hero .hero-title {
    max-width: 780px;
    margin: 0 0 13px;
    color: #fff;
    font-size: clamp(1.8rem, 4vw, 2.65rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -.04em;
}

.home-hero p,
.home-hero .hero-description {
    max-width: 760px;
    margin: 0;
    color: rgb(255 255 255 / .86);
    font-size: 1.02rem;
}

.home-section,
.home-sections {
    margin: 0 0 34px;
}

.section-heading,
.home-section-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 12px;
    margin: 0 0 17px;
}

.section-title {
    margin: 0 0 18px;
    padding: 0 0 11px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.42rem;
    font-weight: 750;
    line-height: 1.4;
}

.section-heading .section-title,
.home-section-header .section-title {
    margin: 0;
    padding: 0;
    border: 0;
}

.section-more {
    flex: 0 0 auto;
    color: var(--primary-color);
    font-size: .9rem;
    font-weight: 650;
}

.category-grid,
.home-category-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.category-card,
.home-category-card {
    display: block;
    min-width: 0;
    padding: 20px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.category-card:hover,
.home-category-card:hover {
    border-color: #bfdbfe;
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.category-card h3,
.home-category-card h3 {
    margin: 0 0 6px;
    color: var(--text-color);
    font-size: 1rem;
}

.category-card p,
.home-category-card p {
    margin: 0;
    color: var(--text-light);
    font-size: .88rem;
}

.featured-grid,
.guide-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.featured-card,
.guide-card {
    min-width: 0;
    padding: 22px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.featured-card:hover,
.guide-card:hover {
    border-color: #bfdbfe;
    box-shadow: var(--shadow);
}

.featured-card h3,
.guide-card h3 {
    margin: 0 0 9px;
    font-size: 1.12rem;
    line-height: 1.5;
}

.featured-card p,
.guide-card p {
    margin: 0;
    color: var(--text-light);
    font-size: .93rem;
}

/* =========================================================
   5. 首页文章列表卡片
   ========================================================= */
.question-card {
    margin: 0 0 17px;
    padding: 23px 25px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.question-card:hover {
    border-color: #cbdcf5;
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.question-header {
    min-width: 0;
}

.question-title {
    margin: 0 0 9px;
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: -.015em;
}

.question-title a {
    color: #1e293b;
}

.question-title a:hover {
    color: var(--primary-color);
}

.question-excerpt {
    margin: 0 0 13px;
    color: var(--text-light);
    font-size: .94rem;
    line-height: 1.75;
}

.question-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 7px 16px;
    color: #8490a2;
    font-size: .82rem;
}

.meta-tag {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: #eff6ff;
    border-radius: 999px;
    color: #1d4ed8;
    font-size: .76rem;
    font-weight: 650;
}

/* =========================================================
   6. 文章主体与标题层级
   ========================================================= */
.single-question {
    width: 100%;
    max-width: 960px;
    margin: 0 auto 28px;
    padding: clamp(22px, 4vw, 46px);
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.single-title {
    margin: 0 0 17px;
    color: #111c30;
    font-size: clamp(1.75rem, 3.4vw, 2.35rem);
    font-weight: 800;
    line-height: 1.32;
    letter-spacing: -.04em;
    overflow-wrap: anywhere;
}

.single-question > .question-header {
    margin-bottom: 25px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border-color);
}

.question-content {
    min-width: 0;
    color: #293548;
    font-size: 1.02rem;
    line-height: 1.9;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.question-content > *:first-child {
    margin-top: 0;
}

.question-content p {
    margin: 0 0 1.25em;
}

.question-content h2,
.question-content h3,
.question-content h4 {
    color: #172033;
    font-weight: 750;
    line-height: 1.45;
    scroll-margin-top: 24px;
}

.question-content h2 {
    margin: 2.15em 0 .85em;
    padding: 0 0 10px;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.55rem;
}

.question-content h3 {
    margin: 1.8em 0 .7em;
    font-size: 1.25rem;
}

.question-content h4 {
    margin: 1.45em 0 .6em;
    font-size: 1.08rem;
}

.question-content ul,
.question-content ol {
    margin: 0 0 1.35em;
    padding-left: 1.65em;
}

.question-content li {
    margin: .35em 0;
    padding-left: .15em;
}

.question-content li > ul,
.question-content li > ol {
    margin-top: .45em;
    margin-bottom: .55em;
}

.question-content strong,
.question-content b {
    color: #172033;
    font-weight: 750;
}

.question-content a {
    color: #1d4ed8;
    text-decoration: underline;
    text-decoration-color: rgb(37 99 235 / .3);
    text-underline-offset: 3px;
    overflow-wrap: anywhere;
}

.question-content a:hover {
    color: #1e40af;
    text-decoration-color: currentColor;
}

.question-content hr {
    height: 1px;
    margin: 2em 0;
    border: 0;
    background: var(--border-color);
}

/* =========================================================
   7. 技术内容：表格、代码、图片、引用、提示框
   ========================================================= */
.question-content table {
    display: block;
    width: 100%;
    max-width: 100%;
    margin: 1.5em 0 1.8em;
    overflow-x: auto;
    border: 1px solid var(--border-strong);
    border-collapse: collapse;
    border-spacing: 0;
    background: #fff;
    font-size: .92rem;
    line-height: 1.65;
    -webkit-overflow-scrolling: touch;
}

.question-content th,
.question-content td {
    min-width: 110px;
    padding: 11px 14px;
    border: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
}

.question-content th {
    background: #f1f5f9;
    color: #1e293b;
    font-weight: 750;
    white-space: nowrap;
}

.question-content tr:nth-child(even) td {
    background: #fafcff;
}

.question-content pre {
    max-width: 100%;
    margin: 1.35em 0 1.6em;
    padding: 18px 20px;
    overflow: auto;
    border: 1px solid #263449;
    border-radius: var(--radius-sm);
    background: #111827;
    color: #e5edf8;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: .87rem;
    line-height: 1.7;
    tab-size: 4;
    white-space: pre;
    -webkit-overflow-scrolling: touch;
}

.question-content pre code {
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    font-size: inherit;
    white-space: inherit;
}

.question-content :not(pre) > code,
.question-content p code,
.question-content li code,
.question-content td code {
    padding: .15em .4em;
    border: 1px solid #e2e8f0;
    border-radius: 5px;
    background: #f1f5f9;
    color: #be123c;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: .88em;
    overflow-wrap: anywhere;
}

.question-content blockquote {
    margin: 1.45em 0;
    padding: 14px 19px;
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: #f3f7ff;
    color: #475569;
}

.question-content blockquote > :last-child {
    margin-bottom: 0;
}

.question-content figure {
    max-width: 100%;
    margin: 1.6em auto;
}

.question-content figure img,
.question-content > img,
.question-content .wp-block-image img,
.question-content .wp-caption img {
    display: block;
    max-width: 100%;
    height: auto;
    margin-right: auto;
    margin-left: auto;
    border-radius: var(--radius-sm);
}

.question-content figcaption,
.question-content .wp-caption-text,
.question-content .blocks-gallery-caption {
    margin-top: 8px;
    color: #8490a2;
    font-size: .84rem;
    line-height: 1.6;
    text-align: center;
}

.question-content .aligncenter {
    display: block;
    margin-right: auto;
    margin-left: auto;
}

.question-content .alignleft {
    float: left;
    margin: 5px 22px 14px 0;
}

.question-content .alignright {
    float: right;
    margin: 5px 0 14px 22px;
}

.question-content .alignwide,
.question-content .alignfull {
    max-width: 100%;
}

.question-content iframe,
.question-content video,
.question-content embed {
    max-width: 100%;
}

.question-content iframe {
    width: 100%;
    border: 0;
}

/* 可给文章中的重点结论、提示和风险说明添加对应 class */
.question-content .notice,
.question-content .article-note,
.question-content .tip-box,
.question-content .key-point {
    margin: 1.4em 0;
    padding: 15px 18px;
    border: 1px solid #bfdbfe;
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-sm);
    background: #eff6ff;
    color: #1e3a8a;
}

.question-content .warning,
.question-content .warning-box {
    border-color: #fcd34d;
    border-left-color: #d97706;
    background: #fffbeb;
    color: #92400e;
}

.question-content .success,
.question-content .success-box {
    border-color: #bbf7d0;
    border-left-color: #16a34a;
    background: #f0fdf4;
    color: #166534;
}

.question-content .danger,
.question-content .danger-box {
    border-color: #fecaca;
    border-left-color: #dc2626;
    background: #fef2f2;
    color: #991b1b;
}

.question-content details {
    margin: 1.2em 0;
    padding: 13px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: #fff;
}

.question-content summary {
    color: #1e293b;
    cursor: pointer;
    font-weight: 700;
}

/* =========================================================
   8. 文章目录（供文章模板生成目录时使用）
   ========================================================= */
.article-layout {
    display: block;
}

.article-main {
    min-width: 0;
}

.article-toc {
    /* 目录放在正文流中，禁止固定、悬浮和独立滚动。 */
    position: static;
    top: auto;
    max-height: none;
    height: auto;
    margin: 24px 0;
    padding: 18px;
    overflow: visible;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.article-toc-title {
    margin: 0 0 11px;
    color: #1e293b;
    font-size: .98rem;
    font-weight: 750;
}

.article-toc ul,
.article-toc ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.article-toc li {
    margin: 0;
    padding: 5px 0;
    font-size: .86rem;
    line-height: 1.55;
}

.article-toc li li {
    padding-left: 13px;
}

.article-toc a {
    color: #64748b;
}

.article-toc a:hover,
.article-toc a.active {
    color: var(--primary-color);
}

/* =========================================================
   9. 置顶内容、标签、相关文章
   ========================================================= */
.sticky-post-end {
    margin: 26px 0 8px;
    padding: 16px 19px;
    border: 1px solid #dbeafe;
    border-radius: var(--radius-sm);
    background: #f8fbff;
}

.sticky-post-end ul {
    margin: 0;
    padding-left: 1.2em;
}

.sticky-post-end li {
    margin: 5px 0;
}

.question-tags {
    margin-top: 27px;
    padding-top: 19px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: .9rem;
}

.question-tags a {
    display: inline-flex;
    align-items: center;
    margin: 5px 5px 0 0;
    padding: 4px 11px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: #f8fafc;
    color: #526176;
    font-size: .82rem;
}

.question-tags a:hover {
    border-color: #bfdbfe;
    background: var(--primary-soft);
    color: var(--primary-color);
}

.related-questions,
.related-questions-seo,
.related-posts {
    max-width: 960px;
    margin: 26px auto 0;
    padding: 23px 25px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.related-questions-seo h3,
.related-title {
    margin: 0 0 13px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: #1e293b;
    font-size: 1.18rem;
    font-weight: 750;
}

.related-questions-seo ul,
.related-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.related-questions-seo li,
.related-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 11px 0;
    border-bottom: 1px solid #edf0f5;
}

.related-questions-seo li:last-child,
.related-list li:last-child {
    border-bottom: 0;
}

.related-questions-seo a,
.related-link {
    min-width: 0;
    color: #334155;
    font-size: .94rem;
    font-weight: 600;
}

.related-questions-seo a:hover,
.related-link:hover {
    color: var(--primary-color);
}

.related-date {
    flex: 0 0 auto;
    color: #94a3b8;
    font-size: .8rem;
    white-space: nowrap;
}

/* =========================================================
   10. 分页、按钮、表单
   ========================================================= */
.pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 7px;
    margin: 30px 0 42px;
}

.page-numbers {
    display: inline-flex;
    min-width: 39px;
    min-height: 39px;
    align-items: center;
    justify-content: center;
    padding: 7px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: #fff;
    color: #475569;
    font-size: .88rem;
    line-height: 1.2;
}

.page-numbers:hover {
    border-color: #bfdbfe;
    background: var(--primary-soft);
    color: var(--primary-color);
}

.page-numbers.current {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: #fff;
    font-weight: 700;
}

.page-numbers.dots {
    border-color: transparent;
    background: transparent;
    color: var(--text-light);
}

.button,
button.button,
input.button {
    display: inline-flex;
    min-height: 43px;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-sm);
    background: var(--primary-color);
    color: #fff;
    font-weight: 650;
    line-height: 1.4;
    transition: background-color .18s ease, border-color .18s ease, transform .18s ease;
}

.button:hover,
button.button:hover,
input.button:hover {
    border-color: var(--primary-hover);
    background: var(--primary-hover);
    color: #fff;
}

input[type="text"],
input[type="email"],
input[type="search"],
input[type="url"],
textarea,
select {
    width: 100%;
    min-height: 43px;
    padding: 9px 12px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text-color);
}

textarea {
    min-height: 120px;
    resize: vertical;
}

/* =========================================================
   11. 页脚
   ========================================================= */
.site-footer {
    margin-top: 58px;
    padding: 28px 0;
    border-top: 1px solid var(--border-color);
    background: #fff;
    color: #8290a3;
    font-size: .86rem;
    text-align: center;
}

.site-footer p {
    margin: 5px 0;
}

.site-footer a {
    color: #64748b;
}

.site-footer a:hover {
    color: var(--primary-color);
}

/* =========================================================
   12. 空状态及 WordPress 通用内容
   ========================================================= */
.empty-state {
    text-align: center;
}

.alignnone {
    max-width: 100%;
    height: auto;
}

.wp-block-embed,
.wp-block-video,
.wp-block-audio {
    margin: 1.5em 0;
}

.wp-block-separator {
    margin: 2em auto;
    border: 0;
    border-top: 1px solid var(--border-color);
}

/* =========================================================
   13. 响应式适配
   ========================================================= */
@media (max-width: 900px) {
    .category-grid,
    .home-category-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .article-layout {
        display: block;
    }

    .article-toc {
        position: static;
        max-height: none;
        overflow: visible;
        margin: 18px 0;
    }
}

@media (max-width: 680px) {
    body {
        font-size: 15px;
        line-height: 1.72;
    }

    .container {
        width: min(100% - 28px, var(--site-width));
    }

    .site-header {
        margin-bottom: 20px;
        padding: 13px 0;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 9px;
    }

    .site-title {
        font-size: 1.28rem;
    }

    .main-navigation {
        width: 100%;
        overflow-x: auto;
        scrollbar-width: thin;
    }

    .nav-menu {
        flex-wrap: nowrap;
        gap: 5px 19px;
        width: max-content;
        min-width: 100%;
    }

    .nav-menu a {
        min-height: 39px;
        font-size: .9rem;
        white-space: nowrap;
    }

    .breadcrumb {
        margin-bottom: 14px;
        font-size: .8rem;
    }

    .home-hero {
        margin-bottom: 22px;
        padding: 25px 21px;
        border-radius: 13px;
    }

    .home-hero h1,
    .home-hero .hero-title {
        font-size: 1.75rem;
    }

    .home-hero p,
    .home-hero .hero-description {
        font-size: .94rem;
    }

    .home-section,
    .home-sections {
        margin-bottom: 27px;
    }

    .category-grid,
    .home-category-grid {
        gap: 10px;
    }

    .category-card,
    .home-category-card {
        padding: 15px;
    }

    .featured-grid,
    .guide-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 11px;
    }

    .question-card {
        margin-bottom: 13px;
        padding: 18px;
        border-radius: 11px;
    }

    .question-title {
        font-size: 1.08rem;
    }

    .question-excerpt {
        font-size: .9rem;
    }

    .single-question {
        padding: 22px 18px;
        border-radius: 12px;
    }

    .single-title {
        font-size: 1.62rem;
        line-height: 1.38;
    }

    .single-question > .question-header {
        margin-bottom: 20px;
        padding-bottom: 17px;
    }

    .question-content {
        font-size: .98rem;
        line-height: 1.85;
    }

    .question-content h2 {
        margin-top: 1.9em;
        font-size: 1.35rem;
    }

    .question-content h3 {
        font-size: 1.15rem;
    }

    .question-content pre {
        padding: 14px;
        font-size: .81rem;
    }

    .question-content th,
    .question-content td {
        min-width: 100px;
        padding: 9px 11px;
        font-size: .85rem;
    }

    .question-content .alignleft,
    .question-content .alignright {
        float: none;
        display: block;
        margin: 1em auto;
    }

    .related-questions,
    .related-questions-seo,
    .related-posts {
        margin-top: 20px;
        padding: 18px;
    }

    .related-list li,
    .related-questions-seo li {
        align-items: flex-start;
    }

    .related-date {
        font-size: .74rem;
    }

    .pagination {
        gap: 5px;
        margin: 24px 0 34px;
    }

    .page-numbers {
        min-width: 35px;
        min-height: 36px;
        padding: 6px 9px;
        font-size: .82rem;
    }

    .site-footer {
        margin-top: 40px;
        padding: 23px 0;
    }
}

@media (max-width: 380px) {
    .container {
        width: calc(100% - 22px);
    }

    .category-grid,
    .home-category-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .question-meta {
        gap: 6px 11px;
    }

    .single-question {
        padding: 19px 15px;
    }
}

/* 尊重访客的减少动态效果设置 */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
}


/* =========================================================
   15. 左右广告位：广告固定原尺寸，网站主体自适应让位
   ========================================================= */
@media (min-width: 681px) {
    :root {
        --side-ad-width: 260px;
        --side-ad-gap: 24px;
    }

    /* 广告保持 260px 原宽度；视口剩余空间全部分配给网站主体 */
    .container {
        width: min(
            var(--site-width),
            calc(100% - var(--side-ad-width) - var(--side-ad-width) - var(--side-ad-gap) - var(--side-ad-gap) - 24px)
        ) !important;
        max-width: var(--site-width);
        margin-left: auto !important;
        margin-right: auto !important;
    }

    html body #space,
    html body #fixed {
        display: block !important;
        position: fixed !important;
        top: 50% !important;
        bottom: auto !important;
        width: var(--side-ad-width) !important;
        min-width: var(--side-ad-width) !important;
        max-width: var(--side-ad-width) !important;
        flex: 0 0 var(--side-ad-width) !important;
        max-height: calc(100vh - 32px) !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        box-sizing: border-box !important;
        transform: translateY(-50%) !important;
        z-index: 20 !important;
        margin: 0 !important;
    }

    html body #space {
        left: 12px !important;
        right: auto !important;
    }

    html body #fixed {
        right: 12px !important;
        left: auto !important;
    }
}

/* 仅手机端隐藏左右广告；桌面和平板均保留广告原尺寸 */
@media (max-width: 680px) {
    html body #space,
    html body #fixed {
        display: none !important;
    }
}