/* ==========================================================================
   黑料社区 - 整站样式表
   说明：本文件按 base / layout / components / pages / responsive 分组，
   覆盖 DOM 清单中实际存在的全部语义 class。
   ========================================================================== */

/* ==========================================================================
   Base - 基础变量、重置与全局元素
   ========================================================================== */

:root {
  --color-primary: #1a2b3c;
  --color-bg: #f5f7fa;
  --color-accent: #ff7a45;
  --color-text: #333333;
  --color-card: #ffffff;
  --color-muted: #6b7a8d;
  --color-border: #e3e8ef;
  --radius-sm: 4px;
  --radius-md: 8px;
  --container-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-base: 0.2s ease;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 15px;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
}

/* 键盘焦点样式，与悬停效果同等清晰 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Layout - 全站布局骨架：页头、页脚、主容器、面包屑、页面标题区
   ========================================================================== */

.site-header {
  background-color: var(--color-primary);
  position: relative;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 1px;
}

.brand-slogan {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.4;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 10px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-link:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.is-current .nav-link,
.nav-link.is-current {
  color: #ffffff;
  font-weight: 600;
  background-color: rgba(255, 255, 255, 0.12);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 1px;
}

.site-main {
  min-height: 60vh;
}

/* 首页主容器 */
.site-main.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 20px 48px;
}

/* 内页主容器 */
.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  user-select: none;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* 页面标题区 */
.page-header,
header.page-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 720px;
  line-height: 1.7;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
}

.footer-brand {
  margin-bottom: 28px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  max-width: 360px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-links .footer-col ul li {
  margin-bottom: 8px;
}

.footer-links .footer-col ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.footer-links .footer-col ul li a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
}

/* ==========================================================================
   Components - 通用组件：链接箭头、按钮、标签、卡片、侧栏、相关链接
   ========================================================================== */

/* 箭头链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

.link-arrow:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.link-arrow span {
  display: inline-block;
  transition: transform var(--transition-base);
}

.link-arrow:hover span {
  transform: translateX(4px);
}

/* 主按钮 */
.btn-primary {
  display: inline-block;
  padding: 10px 22px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.btn-primary:hover {
  background-color: #e86a35;
  color: #ffffff;
  transform: translateY(-1px);
}

/* 次按钮 */
.btn-secondary {
  display: inline-block;
  padding: 10px 22px;
  background-color: transparent;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-primary);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.text-link:hover {
  color: var(--color-primary);
}

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* 卡片通用 */
.board-card,
.rule-item,
.entry-card,
.related-card,
.sidebar-card {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.board-card:hover,
.rule-item:hover,
.entry-card:hover {
  box-shadow: 0 4px 16px rgba(26, 43, 60, 0.08);
  transform: translateY(-2px);
}

/* 侧栏卡片 */
.related-card,
.sidebar-card {
  padding: 20px;
  margin-bottom: 16px;
}

.related-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.related-card h2,
.sidebar-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.related-list li,
.related-card ul li,
.sidebar-card ul li {
  margin-bottom: 10px;
}

.related-list li a,
.related-card ul li a,
.sidebar-card ul li a {
  font-size: 14px;
  color: var(--color-text);
  display: inline-block;
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.related-list li a:hover,
.related-card ul li a:hover,
.sidebar-card ul li a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

/* ==========================================================================
   Pages - 首页
   ========================================================================== */

/* 热帖列表首屏 */
.hero-list {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 24px;
  margin-bottom: 48px;
}

.hero-feature {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hero-media {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.hero-tag {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(255, 122, 69, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.hero-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
}

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

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

.hero-excerpt {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* 热帖紧凑列表 */
.hot-list {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 20px;
}

.hot-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.hot-item:first-child {
  padding-top: 0;
}

.hot-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.hot-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
  line-height: 1.5;
}

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

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

.hot-meta {
  font-size: 13px;
  color: var(--color-muted);
}

/* 版块分类导航带 */
.category-nav {
  margin-bottom: 48px;
}

.category-tags {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.tag-link {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.tag-link:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* 棋盘式图文交替：版块介绍 */
.board-intro {
  margin-bottom: 48px;
}

.board-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.board-intro .board-card {
  overflow: hidden;
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 160px;
}

.board-intro .board-card:nth-child(even) {
  grid-template-columns: 1fr 200px;
}

.board-intro .board-card:nth-child(even) .board-card-content {
  order: 1;
}

.board-intro .board-card:nth-child(even) img {
  order: 2;
}

.board-intro .board-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.board-card-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.board-name {
  font-size: 18px;
  font-weight: 600;
}

.board-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  flex: 1;
}

/* 规则摘要 */
.rules-summary {
  margin-bottom: 48px;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.rule-item {
  padding: 24px;
}

.rule-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.rule-title::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.rule-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 新手指南入口 */
.guide-entry {
  margin-bottom: 8px;
}

.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.entry-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.entry-title {
  font-size: 18px;
  font-weight: 600;
}

.entry-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ==========================================================================
   Pages - 内页通用布局
   ========================================================================== */

/* 版块分类页与规则页：左侧主内容 + 右侧辅助栏 */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

/* 新手指南页：右侧侧栏 */
.page-layout.sidebar-right {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

/* 长尾页布局壳 */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

/* ==========================================================================
   Pages - 版块分类页
   ========================================================================== */

.board-list {
  min-width: 0;
}

.board-list .board-card {
  display: flex;
  gap: 20px;
  padding: 20px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.board-media {
  flex-shrink: 0;
  width: 160px;
  height: 120px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.board-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.board-content {
  flex: 1;
  min-width: 0;
}

.board-content .board-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.board-content .board-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

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

.board-link:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Pages - 社区规则页
   ========================================================================== */

.rules-content {
  min-width: 0;
}

.rules-hero {
  width: 100%;
  aspect-ratio: 16 / 7;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 28px;
}

.rules-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rule-section {
  margin-bottom: 36px;
}

.rule-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.rule-section p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
  color: var(--color-text);
}

.rule-list {
  margin: 8px 0 16px;
  padding-left: 4px;
}

.rule-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 8px;
}

.rule-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.rules-footer-links {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 28px;
}

.rules-footer-links p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
}

.rules-footer-links a {
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 4px;
}

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

/* ==========================================================================
   Pages - 新手指南页
   ========================================================================== */

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

.steps-guide {
  min-width: 0;
}

.steps-guide h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 28px 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.steps-guide h2:first-child {
  margin-top: 0;
}

.steps-guide p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.steps-guide p a {
  color: var(--color-accent);
  font-weight: 500;
}

.steps-guide p a:hover {
  color: var(--color-primary);
}

.guide-figure {
  width: 100%;
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0;
}

.guide-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
  padding: 8px 0;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Pages - 长尾页（热点话题 / 生活互助）
   ========================================================================== */

.guide-content {
  min-width: 0;
}

.guide-content .lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 24px;
  font-weight: 500;
}

.media-figure {
  width: 100%;
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
}

.media-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
  padding: 8px 0;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.guide-section {
  margin-bottom: 32px;
}

.guide-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.guide-section h2.section-title {
  padding-left: 14px;
}

.guide-section h2.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.guide-section p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

/* 文内相关话题 */
.inline-related {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 28px 0;
}

.inline-related p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 0;
}

.inline-related a {
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 4px;
}

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

/* 生活互助页相关阅读 */
.related-reading {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 28px;
}

.related-reading h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.related-reading ul li {
  margin-bottom: 10px;
}

.related-reading ul li a {
  font-size: 14px;
  color: var(--color-text);
}

.related-reading ul li a:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   Pages - 404 页
   ========================================================================== */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 20px;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
  line-height: 1.7;
}

.error-btn {
  display: inline-block;
  padding: 10px 28px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.error-btn:hover {
  background-color: #e86a35;
  color: #ffffff;
}

.error-help {
  font-size: 14px;
  color: var(--color-muted);
}

.error-help a {
  color: var(--color-accent);
  font-weight: 500;
}

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

/* ==========================================================================
   Responsive - 响应式规则
   ========================================================================== */

/* 平板 */
@media (max-width: 992px) {
  .hero-list {
    grid-template-columns: 1fr;
  }

  .hot-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 24px;
  }

  .hot-item:nth-child(odd) {
    border-right: 1px solid var(--color-border);
    padding-right: 24px;
  }

  .board-grid {
    grid-template-columns: 1fr;
  }

  .board-intro .board-card,
  .board-intro .board-card:nth-child(even) {
    grid-template-columns: 200px 1fr;
  }

  .board-intro .board-card:nth-child(even) .board-card-content {
    order: 2;
  }

  .board-intro .board-card:nth-child(even) img {
    order: 1;
  }

  .page-layout,
  .page-layout.sidebar-right,
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .related,
  .sidebar,
  .sidebar-related {
    order: 2;
  }

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

/* 手机 */
@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: 56px;
    padding: 8px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 8px 0;
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 12px 8px;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-item.is-current .nav-link,
  .nav-link.is-current {
    background-color: transparent;
    color: var(--color-accent);
  }

  .brand-slogan {
    display: none;
  }

  .site-main.home-main,
  .site-main.inner-main {
    padding: 20px 16px 40px;
  }

  .hero-list {
    gap: 16px;
    margin-bottom: 36px;
  }

  .hero-media {
    aspect-ratio: 4 / 3;
  }

  .hero-content {
    padding: 16px;
  }

  .hero-title {
    font-size: 20px;
  }

  .hot-list {
    display: block;
  }

  .hot-item:nth-child(odd) {
    border-right: none;
    padding-right: 0;
  }

  .category-nav,
  .board-intro,
  .rules-summary {
    margin-bottom: 36px;
  }

  .board-grid {
    gap: 16px;
  }

  .board-intro .board-card,
  .board-intro .board-card:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .board-intro .board-card img {
    aspect-ratio: 16 / 9;
    height: auto;
  }

  .board-intro .board-card:nth-child(even) .board-card-content {
    order: 2;
  }

  .board-intro .board-card:nth-child(even) img {
    order: 1;
  }

  .rules-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .entry-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-title {
    font-size: 24px;
  }

  .breadcrumb {
    margin-bottom: 16px;
  }

  .board-list .board-card {
    flex-direction: column;
    padding: 16px;
  }

  .board-media {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .rules-hero {
    aspect-ratio: 4 / 3;
  }

  .guide-figure,
  .media-figure {
    aspect-ratio: 4 / 3;
  }

  .footer-inner {
    padding: 32px 16px 20px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .error-main {
    padding: 60px 16px;
  }

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

/* 小屏手机 */
@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .hero-excerpt {
    font-size: 13px;
  }

  .hot-title {
    font-size: 14px;
  }

  .section-title {
    font-size: 20px;
  }

  .rule-item,
  .entry-card {
    padding: 20px;
  }
}