/* ============================================================
   zfrrz.com · 吃瓜视频网 整站样式
   社区公告板视觉 · 深蓝 / 青蓝 / 米白 / 朱红 / 琥珀
   ============================================================ */

/* ============================================================
   1. Base —— 变量、重置、全局基础
   ============================================================ */
:root {
  --color-primary: #1d3557;
  --color-secondary: #457b9d;
  --color-bg: #f1faee;
  --color-accent: #e63946;
  --color-tag: #f4a261;
  --color-text: #2b2d33;
  --color-text-light: #5a6472;
  --color-border: #d8e2dc;
  --color-card-bg: #ffffff;
  --color-header-bg: #1d3557;
  --color-footer-bg: #14273d;
  --color-white: #ffffff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --container-padding: 20px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --header-height: 64px;
  --transition-base: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-primary);
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

/* ============================================================
   2. Layout —— 全站骨架：页头、页脚、主容器、面包屑
   ============================================================ */

/* ---------- 页头 ---------- */
.site-header {
  background-color: var(--color-header-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0;
}

.brand-slogan {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
  display: none;
}

/* 桌面导航 */
.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  gap: 4px;
}

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list li a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.12);
}

.nav-list li a.is-current {
  color: var(--color-white);
  font-weight: 600;
  background-color: rgba(255, 255, 255, 0.16);
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-footer-bg);
  color: rgba(255, 255, 255, 0.72);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-padding) 20px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-brand strong {
  display: block;
  font-size: 18px;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
}

.footer-nav h3,
.footer-aux h3 {
  font-size: 16px;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-nav ul li,
.footer-aux ul li {
  margin-bottom: 10px;
}

.footer-nav ul li a,
.footer-aux ul li a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.footer-nav ul li a:hover,
.footer-aux ul li a:hover {
  color: var(--color-white);
}

.footer-aux p {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 16px;
}

.footer-copyright {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 16px;
  margin-top: 8px;
}

.footer-copyright p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

/* ---------- 主容器（内页） ---------- */
.site-main {
  flex: 1;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 56px;
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
}

.breadcrumb-current {
  color: var(--color-text-light);
}

/* ---------- 页面标题区 ---------- */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--color-border);
}

.page-title {
  font-size: 30px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
}

/* ============================================================
   3. Components —— 通用组件
   ============================================================ */

/* ---------- 卡片 ---------- */
.board-card,
.recommend-card,
.category-card,
.update-item,
.entry-card,
.pinned-post,
.aside-card,
.side-card,
.sidebar-card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 20px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.board-card:hover,
.recommend-card:hover,
.category-card:hover,
.update-item:hover,
.entry-card:hover,
.pinned-post:hover {
  box-shadow: 0 4px 16px rgba(29, 53, 87, 0.1);
  transform: translateY(-2px);
}

/* ---------- 表格 ---------- */
.table-wrap,
.table-wrapper,
.compare-table-wrap,
.comparison-table-wrap {
  overflow-x: auto;
  margin: 16px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background-color: var(--color-card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

thead th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  text-align: left;
  padding: 12px 14px;
  font-size: 14px;
}

tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.6;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:nth-child(even) {
  background-color: rgba(69, 123, 157, 0.06);
}

/* ---------- 列表 ---------- */
.check-list li,
.checklist li,
.method-list li,
.suggestion-list li,
.sidebar-links li,
.side-link-list li,
.sidebar-link-list li,
.link-list li,
.entry-link-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  line-height: 1.7;
}

.check-list li::before,
.checklist li::before,
.method-list li::before,
.suggestion-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-tag);
}

.sidebar-links li::before,
.side-link-list li::before,
.sidebar-link-list li::before,
.link-list li::before,
.entry-link-list li::before {
  content: "›";
  position: absolute;
  left: 2px;
  color: var(--color-secondary);
  font-weight: 700;
}

/* ---------- 步骤列表 ---------- */
.step-list {
  counter-reset: step-counter;
}

.step-list li {
  counter-increment: step-counter;
  position: relative;
  padding: 12px 0 12px 48px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
  line-height: 1.7;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-list li:last-child {
  border-bottom: none;
}

/* ---------- 图片容器 ---------- */
figure {
  margin: 20px 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 2px 0;
  line-height: 1.6;
}

.content-media-primary {
  margin-top: 20px;
}

.content-media-primary img {
  max-height: 300px;
  width: 100%;
  object-fit: cover;
}

.content-media-inline img {
  max-height: 260px;
  width: 100%;
  object-fit: cover;
}

.content-figure img,
.media-figure img,
.guide-figure img,
.side-figure img,
.sidebar-figure img {
  width: 100%;
  object-fit: cover;
}

.content-figure img {
  max-height: 320px;
}

.media-figure img {
  max-height: 300px;
}

.guide-figure img {
  max-height: 280px;
}

.side-figure img,
.sidebar-figure img {
  max-height: 200px;
}

/* ---------- 链接列表 ---------- */
.link-list li a,
.entry-link-list li a {
  font-weight: 600;
}

.entry-link-list li span {
  display: block;
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 2px;
}

/* ---------- 相关链接导航（首页底部） ---------- */
.related-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px 0;
  margin-top: 8px;
}

.related-links-label {
  display: inline-block;
  padding: 6px 14px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.related-links-item {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-card-bg);
  font-size: 14px;
  color: var(--color-secondary);
}

.related-links-item:hover {
  border-color: var(--color-secondary);
  background-color: rgba(69, 123, 157, 0.08);
}

/* ============================================================
   4. Pages —— 页面布局
   ============================================================ */

/* ========== 首页 ========== */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) 56px;
  width: 100%;
}

/* 公告栏 hero 区 */
.hero-announcement {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
  padding: 36px 0 24px;
}

.hero-media img {
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.announcement-content h1 {
  font-size: 30px;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.announcement-text {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.announcement-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.link-card {
  display: inline-block;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-white);
  transition: background-color var(--transition-base);
}

.link-card:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.link-card:last-child {
  background-color: transparent;
  border: 1px solid var(--color-secondary);
  color: var(--color-secondary);
}

.link-card:last-child:hover {
  background-color: rgba(69, 123, 157, 0.08);
}

/* 版块快速入口 */
.board-grid-section,
.hot-posts-section,
.rules-guide-section,
.updates-section,
.feedback-entry-section {
  margin-top: 40px;
}

.section-title {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.board-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.board-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.board-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 14px;
  line-height: 1.6;
}

.board-card a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 热帖列表与置顶摘要并排 */
.hot-posts-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: start;
}

.hot-post-list h3,
.pinned-summary h3 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.hot-post-list ul li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
}

.hot-post-list ul li:last-child {
  border-bottom: none;
}

.hot-post-list ul li a {
  display: block;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
}

.hot-post-list ul li a:hover {
  color: var(--color-accent);
}

.pinned-post {
  margin-bottom: 16px;
  padding: 16px;
  border-left: 3px solid var(--color-accent);
}

.pinned-post h4 {
  font-size: 16px;
  margin-bottom: 6px;
}

.pinned-post p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.post-meta {
  display: block;
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.pinned-post a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 规则速览与新手指引 */
.rules-guide-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.rules-overview,
.guide-entry {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.rules-overview h3,
.guide-entry h3 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.rules-overview ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.6;
}

.rules-overview ul li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: var(--color-accent);
  font-weight: 700;
}

.rules-overview > a {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
}

.guide-entry p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.primary-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
}

.primary-link:hover {
  background-color: #c92a35;
  color: var(--color-white);
}

.guide-entry > a:last-child {
  display: inline-block;
  margin-left: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
}

/* 更新动态 */
.updates-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.update-item {
  padding: 18px;
}

.update-tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-tag);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 10px;
}

.update-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.update-item p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.update-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
}

/* 反馈入口 */
.feedback-entry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.entry-card {
  display: block;
  text-align: center;
  padding: 28px 20px;
}

.entry-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.entry-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin: 0;
}

.entry-card:hover {
  color: var(--color-secondary);
}

.entry-card:hover h3 {
  color: var(--color-accent);
}

/* ========== 内页通用布局 ========== */
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

.layout-shell.sidebar-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.layout-shell.sidebar-right .page-main {
  min-width: 0;
}

.page-aside {
  min-width: 0;
}

/* 内页双栏布局 */
.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 56px;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.content-main,
.main-content {
  min-width: 0;
}

.content-side,
.inner-sidebar {
  min-width: 0;
}

/* posting.html / tips.html 的 layout-shell 直接包 main 和 aside */
.layout-shell:has(> main + aside) {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
  padding-top: 24px;
  padding-bottom: 56px;
}

.layout-shell:has(> main + aside) > main {
  min-width: 0;
}

.layout-shell:has(> main + aside) > aside {
  min-width: 0;
}

/* rules.html 的嵌套结构 */
.layout-shell .page-layout {
  padding: 0;
}

/* ---------- 侧栏 ---------- */
.aside-card,
.side-card,
.sidebar-card {
  margin-bottom: 20px;
}

.aside-card h2,
.side-card h2,
.sidebar-card h2,
.inner-sidebar h2,
.related-links-sidebar h2,
.sidebar-section h2 {
  font-size: 16px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.aside-tip p,
.sidebar-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.aside-card ul li a,
.side-card ul li a,
.sidebar-card ul li a,
.inner-sidebar ul li a,
.related-links-sidebar ul li a,
.sidebar-section ul li a {
  font-size: 14px;
  color: var(--color-secondary);
}

.aside-card ul li a:hover,
.side-card ul li a:hover,
.sidebar-card ul li a:hover,
.inner-sidebar ul li a:hover,
.related-links-sidebar ul li a:hover,
.sidebar-section ul li a:hover {
  color: var(--color-accent);
}

.sidebar-section {
  margin-bottom: 24px;
}

/* ---------- 各内页内容区 ---------- */
.content-section {
  margin-bottom: 40px;
}

.content-section h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.content-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

/* guide.html */
.guide-path p,
.guide-reply > p,
.guide-checklist > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.guide-path .check-list li h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.guide-path .check-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.guide-reply .compare-table {
  margin: 16px 0;
}

.guide-checklist > p:last-child {
  margin-top: 20px;
}

.guide-checklist > p:last-child a {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
}

.guide-checklist > p:last-child a:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* boards.html */
.board-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
}

.board-tag-list li a {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--color-secondary);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-secondary);
  background-color: var(--color-card-bg);
}

.board-tag-list li a:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.recommend-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.recommend-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* posting.html */
.layout-shell > main.content-section {
  margin-bottom: 0;
}

.content-section .checklist li h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.content-section .checklist li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* mistakes.html */
.content-figure {
  margin: 24px 0;
}

.content-section.related-links {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.content-section.related-links h2 {
  font-size: 18px;
}

/* tips.html */
.method-list li {
  padding-left: 24px;
}

.method-list li::before {
  content: "◆";
  left: 2px;
  font-size: 12px;
  background: none;
  color: var(--color-secondary);
}

.topic-discovery-section > p:last-of-type a,
.sustained-engagement-section > p:last-of-type a {
  display: inline-block;
  margin-right: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
  border-bottom: 1px dashed var(--color-secondary);
}

.suggestion-list li {
  padding: 10px 0 10px 24px;
  border-bottom: 1px dashed var(--color-border);
}

.suggestion-list li:last-child {
  border-bottom: none;
}

.feedback-entry-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

/* updates.html */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.category-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.category-card p:last-child {
  margin-bottom: 0;
}

/* rules.html */
.main-content .content-section {
  margin-bottom: 36px;
}

.main-content .content-section h2 {
  font-size: 20px;
}

.main-content .content-section > p {
  font-size: 15px;
  color: var(--color-text-light);
}

.media-figure {
  margin: 20px 0;
}

.content-section.related-links ul li a {
  font-weight: 600;
}

/* feedback.html */
.content-media-inline {
  margin: 20px 0;
}

.content-section .check-list li h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.content-section .check-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ========== 404 页面 ========== */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px var(--container-padding);
}

.error-section {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-section p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.error-link {
  display: inline-block;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-white);
}

.error-link:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.error-link:nth-child(2) {
  background-color: transparent;
  border: 1px solid var(--color-secondary);
  color: var(--color-secondary);
}

.error-link:nth-child(3) {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
}

/* ============================================================
   5. Responsive —— 响应式
   ============================================================ */

/* ---------- 平板（≤1024px） ---------- */
@media (max-width: 1024px) {
  .board-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .updates-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feedback-entry-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .recommend-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-announcement {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-layout,
  .layout-shell.sidebar-right,
  .layout-shell:has(> main + aside) {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 手机（≤768px） ---------- */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --header-height: 56px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-header-bg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    padding: 8px 16px 16px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li a {
    padding: 12px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  .header-inner {
    position: relative;
  }

  /* 单列布局 */
  .hot-posts-layout,
  .rules-guide-layout,
  .hero-announcement {
    grid-template-columns: 1fr;
  }

  .board-grid,
  .updates-grid,
  .feedback-entry-grid,
  .recommend-grid,
  .category-grid {
    grid-template-columns: 1fr;
  }

  .page-layout,
  .layout-shell.sidebar-right,
  .layout-shell:has(> main + aside) {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .content-side,
  .page-aside,
  .inner-sidebar,
  .related-links-sidebar,
  .sidebar,
  .content-side {
    margin-top: 24px;
  }

  /* 移动端顺序：main 在前，aside 在后 */
  .page-layout > main,
  .layout-shell > main {
    order: 1;
  }

  .page-layout > aside,
  .layout-shell > aside {
    order: 2;
  }

  .layout-shell.sidebar-right .page-main {
    order: 1;
  }

  .layout-shell.sidebar-right .page-aside {
    order: 2;
    margin-top: 32px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 32px;
  }

  .footer-copyright {
    margin-top: 8px;
  }

  /* 首页 hero */
  .hero-announcement {
    padding-top: 24px;
  }

  .announcement-content h1 {
    font-size: 26px;
  }

  .announcement-links {
    flex-direction: column;
    align-items: stretch;
  }

  .link-card {
    text-align: center;
  }

  .link-card:last-child {
    margin-left: 0;
  }

  /* 内页标题 */
  .page-header {
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 26px;
  }

  /* 表格在手机上可横向滚动 */
  .table-wrap,
  .table-wrapper,
  .compare-table-wrap,
  .comparison-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 560px;
  }

  /* 404 */
  .error-main {
    padding: 56px var(--container-padding);
  }

  .error-code {
    font-size: 56px;
  }
}

/* ---------- 小手机（≤390px） ---------- */
@media (max-width: 390px) {
  .brand-slogan {
    display: none;
  }

  .brand-name {
    font-size: 20px;
  }

  .board-card,
  .recommend-card,
  .category-card,
  .update-item,
  .entry-card,
  .pinned-post {
    padding: 16px;
  }

  .step-list li {
    padding-left: 44px;
  }

  .step-list li::before {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .error-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .error-link {
    text-align: center;
  }
}

/* ---------- 桌面大屏（≥1600px） ---------- */
@media (min-width: 1600px) {
  .home-main,
  .inner-main,
  .layout-shell,
  .page-layout,
  .header-inner,
  .footer-inner {
    max-width: 1280px;
  }
}