/* ============================================================
   91黑料网 - 整站样式表
   社区类型：话题交流与互助分享
   版本：1.0
   ============================================================ */

/* ============================================================
   Base 基础样式
   ============================================================ */
:root {
  --color-primary: #2b6cb0;
  --color-primary-dark: #2c5282;
  --color-primary-light: #ebf4ff;
  --color-accent: #dd6b20;
  --color-accent-dark: #c05621;
  --color-bg: #f7fafc;
  --color-bg-card: #ffffff;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-text-muted: #a0aec0;
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;
  --color-white: #ffffff;
  --color-black: #1a202c;
  --color-success: #38a169;
  --color-warning: #d69e2e;
  --color-danger: #e53e3e;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);
  --container-width: 1200px;
  --content-width: 960px;
  --header-height: 64px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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;
}

table {
  border-collapse: collapse;
  width: 100%;
}

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

h1 {
  font-size: 26px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0.5rem;
}

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

/* ============================================================
   Layout 布局骨架
   ============================================================ */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* 首页主区 */
.home-main {
  padding-bottom: 48px;
}

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

/* 布局外壳 */
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 首页双栏布局 */
.home-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
  margin-top: 32px;
}

/* 热帖排行页双栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
  margin-top: 24px;
}

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

.side-col {
  min-width: 0;
}

/* ============================================================
   Components 组件
   ============================================================ */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  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: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-text-light);
  white-space: nowrap;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.nav-list li a.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background-color: var(--color-primary-light);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.2;
}

.nav-toggle-text {
  font-size: 14px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
  line-height: 1.5;
  min-height: 44px;
}

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

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

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

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
  transition: background-color 0.2s ease;
  min-height: 44px;
}

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0;
  font-size: 13px;
  color: var(--color-text-light);
}

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

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

.breadcrumb-sep {
  color: var(--color-text-muted);
  font-size: 12px;
}

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

/* ---------- 页面标题区 ---------- */
.page-header {
  padding: 16px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 28px;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 8px;
}

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

/* ---------- 区块标题 ---------- */
.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-black);
  margin-bottom: 16px;
  position: relative;
  padding-left: 12px;
}

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

/* ---------- 首页：社区摘要 ---------- */
.community-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 40px;
  align-items: center;
}

.summary-copy h1 {
  font-size: 28px;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--color-black);
}

.summary-copy p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  max-width: 560px;
  line-height: 1.8;
}

.summary-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.summary-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

/* ---------- 首页：版块导航标签 ---------- */
.board-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 8px;
}

.board-tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.board-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-text);
  transition: border-color 0.2s ease, background-color 0.2s ease,
    color 0.2s ease;
  min-height: 44px;
}

.board-tag:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* ---------- 首页：热帖列表 ---------- */
.hot-list-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-heading .section-title {
  margin-bottom: 0;
}

.link-more {
  font-size: 13px;
  color: var(--color-primary);
  white-space: nowrap;
}

.link-more:hover {
  text-decoration: underline;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-item {
  border-bottom: 1px solid var(--color-border-light);
}

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

.post-card {
  padding: 14px 8px;
  transition: background-color 0.2s ease;
  border-radius: var(--radius-md);
}

.post-card:hover {
  background-color: var(--color-bg);
}

.post-card h3 {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 6px;
  line-height: 1.5;
}

.post-card h3 a {
  color: var(--color-text);
}

.post-card h3 a:hover {
  color: var(--color-primary);
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-light);
}

.post-board {
  color: var(--color-primary);
  font-weight: 500;
}

.post-replies {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.post-time {
  color: var(--color-text-muted);
}

.list-media {
  margin-top: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

/* ---------- 首页：侧栏公告与规则 ---------- */
.aside-announce-rules {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.announcement-panel,
.rules-digest {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

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

.announce-list li,
.rules-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.announce-list li:last-child,
.rules-list li:last-child {
  border-bottom: none;
}

.announce-list a,
.rules-list a {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.5;
  display: block;
}

.announce-list a:hover,
.rules-list a:hover {
  color: var(--color-primary);
}

/* ---------- 首页：新手指南步骤 ---------- */
.guide-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  position: relative;
  transition: box-shadow 0.2s ease;
}

.step-item:hover {
  box-shadow: var(--shadow-md);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: 50%;
  margin-bottom: 10px;
}

.step-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.step-item p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ---------- 首页：版块对比速览表 ---------- */
.board-table-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.board-filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.filter-tab {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 40px;
}

.filter-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-tab.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 500;
}

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

.board-compare-table {
  min-width: 800px;
}

.board-compare-table th,
.board-compare-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
  vertical-align: top;
}

.board-compare-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-black);
  white-space: nowrap;
}

.board-compare-table td {
  color: var(--color-text);
  line-height: 1.6;
}

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

.table-media {
  margin-top: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.table-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.table-conclusion {
  margin-top: 16px;
  background-color: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
  padding: 14px 16px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

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

.table-conclusion strong {
  color: var(--color-primary);
}

/* ---------- 首页：反馈入口条 ---------- */
.feedback-bar {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.feedback-bar .section-title {
  margin-bottom: 8px;
}

.feedback-bar p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
  padding: 40px 0 32px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

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

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

.footer-group ul li a {
  font-size: 14px;
  color: var(--color-text-light);
}

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

.footer-group p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.copyright {
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 话题广场：版块目录表 ---------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
  margin-bottom: 32px;
}

.board-table {
  min-width: 720px;
}

.board-table th,
.board-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
  vertical-align: top;
}

.board-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-black);
}

.board-table td {
  color: var(--color-text);
  line-height: 1.6;
}

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

/* ---------- 话题广场：版块详情卡片 ---------- */
.board-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

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

.board-card:hover {
  box-shadow: var(--shadow-md);
}

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

.card-body {
  padding: 20px;
  flex: 1;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-black);
}

.card-definition {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.card-detail {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 10px;
}

.card-example {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
  background-color: var(--color-bg);
  padding: 10px 12px;
  border-radius: var(--radius-md);
}

.card-terms {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 话题广场：相关入口 ---------- */
.topics-links {
  margin-top: 32px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.links-inner p {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 0;
}

.links-inner a {
  font-weight: 500;
}

/* ---------- 热帖排行：榜单 ---------- */
.hot-list-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 40px;
}

.filter-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-tag.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 500;
}

.hot-post-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.post-title {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
  line-height: 1.5;
}

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

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

/* ---------- 热帖排行：侧栏标签说明 ---------- */
.aside-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.tag-explanation {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tag-item {
  padding: 10px 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
}

.tag-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.tag-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 0;
}

.aside-media {
  margin-top: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.aside-media img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.aside-media figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 8px 4px 0;
  text-align: center;
}

/* ---------- 热帖排行：相关链接 ---------- */
.related-links {
  margin-top: 32px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

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

.related-inner a {
  font-weight: 500;
}

/* ---------- 参与指南：步骤列表 ---------- */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 24px;
}

.step-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
}

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

.step-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-black);
}

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

.step-tip {
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-bg);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  line-height: 1.6;
  margin-bottom: 0;
}

.step-tip strong {
  color: var(--color-primary);
  font-weight: 500;
}

.guide-media {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.guide-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.guide-media figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 10px 4px;
  text-align: center;
}

/* ---------- 参与指南：建议列表 ---------- */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

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

.tips-subtitle {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-black);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.tips-list li {
  font-size: 14px;
  color: var(--color-text);
  padding: 6px 0;
  line-height: 1.6;
  position: relative;
  padding-left: 16px;
}

.tips-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

/* ---------- 参与指南：相关入口 ---------- */
.related-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-black);
  margin-bottom: 12px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-list li a {
  font-size: 14px;
  color: var(--color-primary);
}

.related-list li a:hover {
  text-decoration: underline;
}

/* ---------- 社区规范：对照表 ---------- */
.rule-figure {
  margin-bottom: 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.rule-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 10px 4px;
  text-align: center;
}

.rule-compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.rule-table-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.rule-table-title {
  font-size: 16px;
  font-weight: 600;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-black);
}

.allow-card .rule-table-title {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.forbid-card .rule-table-title {
  background-color: #fff5f5;
  color: var(--color-danger);
}

.rule-table th,
.rule-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
  vertical-align: top;
  line-height: 1.6;
}

.rule-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-black);
  font-size: 13px;
}

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

/* ---------- 社区规范：违规处理 ---------- */
.penalty-levels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

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

.penalty-level h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-black);
}

.penalty-level p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ---------- 反馈通道：反馈类型 ---------- */
.feedback-hero {
  margin-bottom: 24px;
}

.feedback-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.feedback-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 10px 4px;
  text-align: center;
}

.type-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.type-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: box-shadow 0.2s ease;
}

.type-card:hover {
  box-shadow: var(--shadow-md);
}

.type-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-black);
}

.type-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.type-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.type-steps li {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}

.type-steps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

.type-steps li strong {
  color: var(--color-primary);
  font-weight: 500;
}

/* ---------- 反馈通道：准备信息 ---------- */
.preparation {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.preparation-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.prep-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.prep-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
}

.prep-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: 50%;
  flex-shrink: 0;
}

.prep-list li p {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 0;
  line-height: 1.6;
}

.prep-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.prep-note a {
  color: var(--color-primary);
}

/* ---------- 关于本站：定位说明 ---------- */
.positioning-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: center;
  margin-bottom: 32px;
}

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

.positioning-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.positioning-media figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 8px 4px;
  text-align: center;
}

/* ---------- 关于本站：数据字段表 ---------- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
  margin-bottom: 32px;
}

.data-table {
  min-width: 720px;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 14px;
  vertical-align: top;
  line-height: 1.6;
}

.data-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  color: var(--color-black);
}

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

/* ---------- 关于本站：使用边界 ---------- */
.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.boundary-list li {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  padding: 12px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding-left: 36px;
  position: relative;
}

.boundary-list li::before {
  content: "!";
  position: absolute;
  left: 12px;
  top: 12px;
  width: 20px;
  height: 20px;
  background-color: var(--color-warning);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 600;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 404 页面 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

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

.error-section h1 {
  font-size: 28px;
  margin-bottom: 16px;
}

.error-section p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.error-section .btn-back {
  margin-top: 16px;
  display: inline-flex;
}

/* ============================================================
   Pages 页面级样式
   ============================================================ */

/* 首页 */
.site-home .community-summary {
  padding-top: 56px;
}

/* 话题广场 */
.page-topics .board-table-section {
  max-width: none;
  padding: 0;
  margin-bottom: 32px;
}

.page-topics .board-detail-section {
  margin-bottom: 32px;
}

/* 热帖排行 */
.page-hot .hot-list-section {
  margin-bottom: 24px;
}

/* 参与指南 */
.page-guide .guide-steps {
  max-width: var(--content-width);
  padding: 0;
  margin-bottom: 24px;
}

.page-guide .guide-tips {
  max-width: var(--content-width);
  margin-bottom: 24px;
}

.page-guide .related-links {
  max-width: var(--content-width);
  margin: 0;
}

/* 社区规范 */
.page-rules .rule-compare-section {
  margin-bottom: 32px;
}

.page-rules .penalty-section {
  margin-bottom: 32px;
}

.page-rules .related-links {
  margin: 0;
}

/* 反馈通道 */
.page-feedback .feedback-types {
  margin-bottom: 24px;
}

.page-feedback .preparation {
  margin-bottom: 24px;
}

/* 关于本站 */
.page-about .positioning-note {
  margin-bottom: 24px;
}

.page-about .data-table-section {
  margin-bottom: 24px;
}

/* ============================================================
   Responsive 响应式
   ============================================================ */

/* 平板及以下 */
@media (max-width: 1024px) {
  .home-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 20px;
  }

  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .board-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 20px;
  }
}

/* 移动端断点 768px */
@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    padding: 10px 16px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .brand {
    flex: 1;
  }

  .brand-tagline {
    display: none;
  }

  /* 移动端菜单按钮显示 */
  .nav-toggle {
    display: inline-flex;
  }

  /* 移动端导航收起 */
  .site-nav {
    order: 3;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px 0;
    border-top: 1px solid var(--color-border-light);
  }

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

  .nav-list li a {
    padding: 12px 8px;
    font-size: 15px;
  }

  /* 首页 */
  .community-summary {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

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

  .summary-media img {
    height: 200px;
  }

  .board-nav {
    padding: 24px 16px 8px;
  }

  .board-tag-group {
    flex-direction: column;
    align-items: stretch;
  }

  .board-tag {
    width: 100%;
    justify-content: flex-start;
  }

  .home-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px;
    margin-top: 24px;
  }

  /* 首页移动端：热帖列表在侧栏之前 */
  .hot-list-panel {
    order: 1;
  }

  .aside-announce-rules {
    order: 2;
  }

  .guide-steps {
    padding: 32px 16px 8px;
  }

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

  .board-table-section {
    padding: 32px 16px 8px;
  }

  .table-scroll {
    overflow-x: auto;
  }

  .board-compare-table {
    min-width: 640px;
  }

  .feedback-bar {
    padding: 32px 16px 8px;
    flex-direction: column;
    align-items: flex-start;
  }

  .feedback-bar .btn {
    width: 100%;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px;
  }

  .footer-group {
    border-bottom: 1px solid var(--color-border-light);
    padding-bottom: 16px;
  }

  .footer-group:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  /* 内页 */
  .inner-main {
    padding: 16px 16px 40px;
  }

  .page-header {
    padding: 12px 0 20px;
    margin-bottom: 24px;
  }

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

  .page-description {
    font-size: 14px;
  }

  /* 话题广场 */
  .board-card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .board-table {
    min-width: 600px;
  }

  /* 热帖排行 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 20px;
  }

  .side-col {
    order: 2;
  }

  .main-col {
    order: 1;
  }

  .hot-list-section {
    padding: 16px;
  }

  .hot-post-item {
    padding: 14px 0;
  }

  .post-title {
    font-size: 15px;
  }

  /* 参与指南 */
  .page-guide .guide-steps,
  .page-guide .guide-tips,
  .page-guide .related-links {
    max-width: 100%;
  }

  .step-item {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
  }

  .step-number {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .guide-media img {
    height: 160px;
  }

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

  /* 社区规范 */
  .rule-compare-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .rule-hero-image {
    height: 160px;
  }

  .penalty-levels {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 反馈通道 */
  .type-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .feedback-figure img {
    height: 140px;
  }

  .prep-list li {
    flex-direction: column;
    gap: 8px;
  }

  .prep-item {
    width: 24px;
    height: 24px;
    font-size: 13px;
  }

  /* 关于本站 */
  .positioning-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .positioning-media img {
    height: 160px;
  }

  .data-table {
    min-width: 600px;
  }

  /* 404 */
  .error-main {
    padding: 60px 16px;
  }

  .error-section h1 {
    font-size: 24px;
  }
}

/* 小屏手机 390px 适配 */
@media (max-width: 480px) {
  .header-inner {
    padding: 8px 12px;
  }

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

  .nav-toggle {
    padding: 6px 10px;
  }

  .summary-copy h1 {
    font-size: 22px;
  }

  .summary-media img {
    height: 170px;
  }

  .hot-list-panel,
  .announcement-panel,
  .rules-digest {
    padding: 16px;
  }

  .post-meta {
    gap: 8px;
    font-size: 12px;
  }

  .table-scroll,
  .table-wrapper,
  .table-wrap {
    margin-left: -8px;
    margin-right: -8px;
  }

  .board-compare-table,
  .board-table,
  .data-table {
    min-width: 560px;
  }

  .step-item {
    padding: 14px;
  }

  .type-card,
  .penalty-level,
  .tips-column {
    padding: 16px;
  }

  .rule-table-card {
    overflow-x: auto;
  }

  .rule-table {
    min-width: 480px;
  }
}