/* ==========================================================================
   吃瓜视频网 - 整站样式表
   ========================================================================== */

/* ==========================================================================
   Base - 变量、重置、全局基础
   ========================================================================== */

:root {
  --color-primary: #3B6FF5;
  --color-primary-dark: #2F5BD8;
  --color-accent: #FF7A45;
  --color-bg: #F7F8FA;
  --color-text: #222222;
  --color-text-secondary: #666666;
  --color-border: #E5E6EB;
  --color-white: #FFFFFF;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.1);
}

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

html {
  font-size: 16px;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.75;
  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-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 18px;
}

p:last-child {
  margin-bottom: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Layout - 全局布局骨架
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.site-inner {
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

/* 页头 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

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

.brand-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0;
}

.brand-name::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-accent);
  margin-right: 8px;
  vertical-align: middle;
}

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

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  line-height: 1.5;
}

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

.nav-list a.is-current {
  color: var(--color-text);
  font-weight: 600;
  border-bottom-color: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 44px;
  height: 44px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-toggle-icon {
  display: block;
  position: relative;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

/* 面包屑 */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

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

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

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

/* 页头标题区 */

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.75;
}

/* 页脚 */

.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
}

.footer-brand {
  flex-shrink: 0;
  max-width: 320px;
}

.footer-sitename {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 48px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.footer-col ul a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ==========================================================================
   Components - 通用组件
   ========================================================================== */

/* 按钮 */

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 区块标题 */

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

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.section-subtitle,
.section-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 状态标签 */

.status-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 12px;
  line-height: 1.6;
  border-radius: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.status-active {
  background-color: rgba(255, 122, 69, 0.12);
  color: var(--color-accent);
}

.status-new {
  background-color: rgba(59, 111, 245, 0.1);
  color: var(--color-primary);
}

.status-maintenance {
  background-color: rgba(102, 102, 102, 0.1);
  color: var(--color-text-secondary);
}

.status-live {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 500;
}

.status-live::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

.status-normal {
  background-color: rgba(59, 111, 245, 0.08);
  color: var(--color-primary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 12px;
  border-radius: 4px;
  background-color: var(--color-bg);
  color: var(--color-text-secondary);
}

/* 侧栏布局 */

.layout-shell {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.sidebar-left .page-layout,
.sidebar-left.layout-shell {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.sidebar-left .page-layout > aside,
.sidebar-left.layout-shell > aside {
  flex-shrink: 0;
  width: 240px;
  order: -1;
}

.sidebar-left .page-layout > .about-content,
.sidebar-left .page-layout > .rules-content,
.sidebar-left .page-layout > .help-content,
.sidebar-left.layout-shell > .about-content,
.sidebar-left.layout-shell > .rules-content,
.sidebar-left.layout-shell > .help-content {
  flex: 1;
  min-width: 0;
}

/* ==========================================================================
   Components - 首页专用组件
   ========================================================================== */

/* 服务台 Hero */

.hero-desk {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.hero-copy {
  padding-top: 8px;
}

.hero-copy h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.hero-lead {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
}

.hero-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.notice-board,
.active-boards {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.notice-title,
.aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.notice-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 12px;
}

.notice-list li:last-child {
  margin-bottom: 0;
}

.notice-badge {
  flex-shrink: 0;
  font-size: 12px;
  color: var(--color-accent);
  background-color: rgba(255, 122, 69, 0.1);
  padding: 1px 8px;
  border-radius: 4px;
  margin-top: 2px;
}

.notice-list a {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

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

.board-quick-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.board-quick-list a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.board-quick-list a:hover {
  color: var(--color-primary);
}

/* 版块直通车 */

.board-directory {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
}

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

.board-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.board-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.board-card img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 8px;
}

.board-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.board-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
  flex-grow: 1;
}

.board-card .status-tag {
  align-self: flex-start;
}

.board-card-maintenance {
  opacity: 1;
}

.card-link {
  position: absolute;
  inset: 0;
  z-index: 1;
  font-size: 0;
}

/* 首页主网格：话题流 + 热帖 */

.home-main-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  align-items: start;
}

.topic-stream {
  min-width: 0;
}

.topic-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.topic-title {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.5;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.topic-board {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-primary);
  background-color: rgba(59, 111, 245, 0.08);
  padding: 2px 10px;
  border-radius: 4px;
  white-space: nowrap;
}

.topic-meta {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.more-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 500;
}

/* 热帖排行侧栏 */

.sidebar-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.hot-rank .aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.rank-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.rank-no {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.rank-list li:nth-child(1) .rank-no {
  background-color: rgba(255, 122, 69, 0.15);
  color: var(--color-accent);
}

.rank-list li:nth-child(2) .rank-no {
  background-color: rgba(255, 122, 69, 0.1);
  color: var(--color-accent);
}

.rank-list li:nth-child(3) .rank-no {
  background-color: rgba(255, 122, 69, 0.08);
  color: var(--color-accent);
}

.rank-list a {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.rank-count {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.sidebar-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.sidebar-note p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 参与路径 */

.joining-path {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
}

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

.step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.step-item a {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-primary);
}

/* 规则摘要与帮助入口 */

.rules-digest {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 56px;
}

.rules-warning {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.rules-warning .section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.warning-lead {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.core-rules {
  margin-bottom: 16px;
}

.core-rules li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
  margin-bottom: 6px;
}

.core-rules li::before {
  content: '·';
  position: absolute;
  left: 8px;
  color: var(--color-accent);
  font-weight: 700;
}

.rules-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
}

.help-entry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.help-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.help-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.help-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.help-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
  flex-grow: 1;
}

.help-card .card-link {
  position: static;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

/* ==========================================================================
   Components - 版块导航页
   ========================================================================== */

.board-table-section {
  margin-bottom: 48px;
}

.board-table-section h2,
.board-entries h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.table-scroll-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
}

.board-overview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}

.board-overview-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.board-overview-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  line-height: 1.6;
  vertical-align: top;
}

.board-overview-table tr:last-child td {
  border-bottom: none;
}

.board-overview-table td:first-child {
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

.board-entries {
  margin-bottom: 48px;
}

.board-entry {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
}

.entry-media {
  flex-shrink: 0;
  width: 160px;
}

.entry-media img {
  width: 160px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

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

.entry-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.entry-definition {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 8px;
}

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

.entry-example,
.entry-related {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.entry-example strong,
.entry-related strong {
  font-weight: 600;
  color: var(--color-text);
  margin-right: 8px;
}

.entry-related a {
  color: var(--color-primary);
  margin-right: 12px;
}

.related-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.related-nav-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.related-nav-card h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.related-nav-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.related-nav-card a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 8px;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-primary);
  padding: 4px 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  line-height: 1.5;
}

.related-links-item:hover {
  border-color: var(--color-primary);
}

/* ==========================================================================
   Components - 话题热榜页
   ========================================================================== */

.hot-list-section {
  margin-bottom: 40px;
}

.topic-top-list {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 8px 24px;
}

.topic-top-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.topic-top-item:last-child {
  border-bottom: none;
}

.topic-rank {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.topic-top-item:nth-child(1) .topic-rank {
  background-color: rgba(255, 122, 69, 0.15);
  color: var(--color-accent);
}

.topic-top-item:nth-child(2) .topic-rank {
  background-color: rgba(255, 122, 69, 0.1);
  color: var(--color-accent);
}

.topic-top-item:nth-child(3) .topic-rank {
  background-color: rgba(255, 122, 69, 0.08);
  color: var(--color-accent);
}

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

.topic-top-content .topic-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topic-top-content .topic-title a {
  color: var(--color-text);
}

.topic-top-content .topic-title a:hover {
  color: var(--color-primary);
}

.topic-top-content .topic-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.topic-replies {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.topic-heat {
  font-size: 12px;
  color: var(--color-accent);
  background-color: rgba(255, 122, 69, 0.1);
  padding: 1px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

/* 日期轨道 */

.date-track-section {
  margin-bottom: 40px;
}

.date-track {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.date-track-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 80px;
  transition: all 0.2s ease;
}

.date-track-item:hover {
  border-color: var(--color-primary);
}

.date-track-item.is-today {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.date-week {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.date-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.date-heat {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.date-track-item.is-today .date-week,
.date-track-item.is-today .date-num,
.date-track-item.is-today .date-heat {
  color: var(--color-white);
}

/* 话题卡片 */

.topic-cards-section {
  margin-bottom: 40px;
}

.date-group-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 24px 0 16px;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

.topic-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.topic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.topic-card-media img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.topic-card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.topic-card-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
}

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

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

.topic-card-excerpt {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
}

.topic-status {
  font-size: 12px;
  color: var(--color-primary);
  background-color: rgba(59, 111, 245, 0.08);
  padding: 1px 8px;
  border-radius: 4px;
}

/* 内联引导链接 */

.inline-guide-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
}

.inline-guide-links a {
  font-size: 14px;
  color: var(--color-primary);
  padding: 6px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  line-height: 1.5;
}

.inline-guide-links a:hover {
  border-color: var(--color-primary);
}

/* 右侧热榜 */

.sidebar-right {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.sidebar-right .main-content-col {
  flex: 1;
  min-width: 0;
}

.sidebar-right .sidebar-col {
  flex-shrink: 0;
  width: 300px;
}

.weekly-ranking {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.weekly-ranking h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.weekly-rank-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.rank-num {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.weekly-rank-list li:nth-child(1) .rank-num {
  background-color: rgba(255, 122, 69, 0.15);
  color: var(--color-accent);
}

.weekly-rank-list li:nth-child(2) .rank-num {
  background-color: rgba(255, 122, 69, 0.1);
  color: var(--color-accent);
}

.weekly-rank-list li:nth-child(3) .rank-num {
  background-color: rgba(255, 122, 69, 0.08);
  color: var(--color-accent);
}

.weekly-rank-list a {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.weekly-rank-list a:hover {
  color: var(--color-primary);
}

.rank-replies {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* ==========================================================================
   Components - 新人手册页
   ========================================================================== */

.guide-steps {
  margin-bottom: 48px;
}

.guide-steps > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.guide-steps > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.guide-steps .step-item {
  display: flex;
  gap: 24px;
  padding: 32px 24px;
  margin-bottom: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.guide-steps .step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
}

.guide-steps .step-content {
  flex: 1;
  min-width: 0;
}

.guide-steps .step-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.guide-steps .step-content > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.step-media {
  margin-bottom: 16px;
}

.step-media figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg);
}

.step-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.step-media figcaption {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.guide-steps .tip {
  font-size: 14px;
  color: var(--color-text-secondary);
  background-color: rgba(255, 122, 69, 0.06);
  border-left: 3px solid var(--color-accent);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.7;
}

.guide-steps .tip strong {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 4px;
}

/* 快问快答 */

.quick-qa {
  margin-bottom: 48px;
}

.quick-qa > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.quick-qa > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.quick-qa > p a {
  color: var(--color-primary);
  font-weight: 500;
}

.qa-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.qa-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  line-height: 1.5;
}

.qa-item summary::-webkit-details-marker {
  display: none;
}

.qa-item summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

.qa-item[open] summary::after {
  content: '−';
}

.qa-item summary:hover {
  color: var(--color-primary);
}

.qa-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 帮助入口 */

.help-entry {
  margin-bottom: 48px;
}

.entry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.entry-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.entry-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.entry-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.entry-card p a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ==========================================================================
   Components - 版规中心页
   ========================================================================== */

.rules-hero-figure {
  margin-bottom: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.rules-hero-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.rules-toc {
  flex-shrink: 0;
  width: 240px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.rules-toc h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.toc-list li {
  margin-bottom: 4px;
}

.toc-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.toc-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.toc-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.toc-note p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.toc-note a {
  font-size: 13px;
  color: var(--color-primary);
}

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

.rules-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.rules-section h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.rules-section > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.rule-list {
  margin-bottom: 12px;
}

.rule-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.rule-list li::before {
  content: '·';
  position: absolute;
  left: 8px;
  color: var(--color-primary);
  font-weight: 700;
}

.process-steps {
  counter-reset: process-step;
}

.process-steps li {
  position: relative;
  padding: 0 0 24px 36px;
  border-left: 2px solid var(--color-border);
  margin-left: 12px;
}

.process-steps li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.process-steps li::before {
  counter-increment: process-step;
  content: counter(process-step);
  position: absolute;
  left: -14px;
  top: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 600;
  border-radius: 50%;
}

.process-steps h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.process-steps p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.rules-related-nav {
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 24px;
}

.rules-related-nav p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.rules-related-nav a {
  color: var(--color-primary);
  margin-right: 16px;
  font-weight: 500;
}

/* ==========================================================================
   Components - 帮助与反馈页
   ========================================================================== */

.help-catalog {
  flex-shrink: 0;
  width: 240px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.catalog-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.catalog-list li {
  margin-bottom: 4px;
}

.catalog-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.catalog-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.catalog-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.faq-group {
  margin-bottom: 40px;
}

.faq-group-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.content-media {
  margin-bottom: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-white);
}

.content-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.content-media figcaption {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  line-height: 1.5;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item summary:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 16px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 12px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* 反馈路径 */

.feedback-path {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 16px;
}

.feedback-path-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.feedback-path-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.path-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.path-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.path-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

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

/* ==========================================================================
   Components - 关于本站页
   ========================================================================== */

.page-shell {
  width: 100%;
}

.about-aside {
  flex-shrink: 0;
  width: 240px;
}

.aside-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.aside-card h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.aside-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

.about-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.about-section h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.section-lead {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-section > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.about-figure {
  margin-top: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg);
}

.about-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.about-figure figcaption {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.boundary-list,
.join-list,
.process-list {
  margin-bottom: 12px;
}

.boundary-list li,
.join-list li,
.process-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.boundary-list li::before,
.join-list li::before,
.process-list li::before {
  content: '·';
  position: absolute;
  left: 8px;
  color: var(--color-primary);
  font-weight: 700;
}

.about-section .related-nav {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.about-section .related-nav p {
  margin-bottom: 0;
}

.about-section .related-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-right: 16px;
}

/* ==========================================================================
   Components - 404 页面
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  text-align: center;
  max-width: 560px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.error-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.error-help {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.error-help a {
  color: var(--color-primary);
  margin: 0 8px;
  font-weight: 500;
}

/* ==========================================================================
   Pages - 页面级微调
   ========================================================================== */

.page-board-map .inner-main,
.page-hot-topics .inner-main,
.page-newcomer-guide .inner-main,
.page-rules-center .inner-main,
.page-help-center .inner-main,
.page-about-us .inner-main {
  padding-top: 32px;
}

/* ==========================================================================
   Responsive - 响应式断点
   ========================================================================== */

@media (max-width: 1024px) {
  .board-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .sidebar-right {
    flex-direction: column;
  }

  .sidebar-right .sidebar-col {
    width: 100%;
    order: -1;
  }

  .sidebar-right .main-content-col {
    width: 100%;
  }

  .sidebar-left .page-layout,
  .sidebar-left.layout-shell {
    flex-direction: column;
  }

  .sidebar-left .page-layout > aside,
  .sidebar-left.layout-shell > aside {
    width: 100%;
    order: 0;
  }

  .sidebar-left .page-layout > .about-content,
  .sidebar-left .page-layout > .rules-content,
  .sidebar-left .page-layout > .help-content,
  .sidebar-left.layout-shell > .about-content,
  .sidebar-left.layout-shell > .rules-content,
  .sidebar-left.layout-shell > .help-content {
    width: 100%;
  }

  .rules-toc,
  .help-catalog,
  .about-aside {
    width: 100%;
  }

  .toc-list,
  .catalog-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .toc-list li,
  .catalog-list li {
    margin-bottom: 0;
  }

  .toc-list a,
  .catalog-list a {
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: 16px;
  }

  .toc-note,
  .catalog-note {
    margin-top: 12px;
  }
}

@media (max-width: 768px) {
  .header-shell {
    height: 56px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px;
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-list a {
    padding: 14px 8px;
    font-size: 16px;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .nav-list a.is-current {
    border-bottom: none;
    border-left-color: var(--color-primary);
    background-color: var(--color-bg);
  }

  .hero-desk {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-figure img {
    height: 160px;
  }

  .board-directory {
    padding: 32px 16px;
  }

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

  .board-card {
    padding: 16px;
  }

  .board-card img {
    height: 140px;
  }

  .home-main-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px;
  }

  .joining-path {
    padding: 32px 16px;
  }

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

  .rules-digest {
    padding: 32px 16px 48px;
  }

  .help-entry-grid {
    grid-template-columns: 1fr;
  }

  .footer-shell {
    flex-direction: column;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-links {
    flex-direction: column;
    gap: 24px;
  }

  .footer-bottom {
    padding: 12px 16px;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

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

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

  .entry-media {
    width: 100%;
  }

  .entry-media img {
    width: 100%;
    height: 160px;
  }

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

  .topic-top-item {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topic-top-content {
    width: calc(100% - 44px);
  }

  .topic-replies {
    margin-left: 44px;
  }

  .date-track {
    gap: 8px;
  }

  .date-track-item {
    min-width: 64px;
    padding: 10px 14px;
  }

  .topic-card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .topic-card-media img {
    height: 160px;
  }

  .guide-steps .step-item {
    flex-direction: column;
    gap: 16px;
    padding: 24px 16px;
  }

  .guide-steps .step-number {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

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

  .rules-hero-figure img {
    height: 140px;
  }

  .rules-section {
    padding: 16px;
  }

  .process-steps li {
    padding-left: 32px;
  }

  .feedback-path-grid {
    grid-template-columns: 1fr;
  }

  .about-section {
    padding: 16px;
  }

  .about-figure img {
    height: 160px;
  }

  .about-section .related-nav {
    flex-direction: column;
    gap: 8px;
  }

  .error-panel {
    padding: 32px 24px;
  }

  .error-code {
    font-size: 48px;
  }
}

@media (max-width: 390px) {
  .header-shell {
    padding: 0 12px;
  }

  .brand-name {
    font-size: 18px;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .topic-list li {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topic-title {
    width: 100%;
    white-space: normal;
  }

  .topic-board {
    order: 2;
  }

  .topic-meta {
    order: 3;
    margin-left: auto;
  }

  .topic-top-content .topic-meta {
    flex-wrap: wrap;
    gap: 8px;
  }

  .topic-heat {
    margin-left: 0;
  }

  .date-track-item {
    min-width: 56px;
    padding: 8px 12px;
  }

  .date-num {
    font-size: 18px;
  }

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

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    width: 100%;
  }
}