/* ==========================================================================
   base — 变量、重置、全局基础样式
   ========================================================================== */

:root {
  --color-bg: #F7F7FA;
  --color-text: #1E232B;
  --color-accent: #B56A1B;
  --color-secondary: #2F6B4F;
  --color-card: #FFFFFF;
  --color-border: #E5E7EB;
  --color-text-light: #5B6472;
  --color-text-muted: #8A93A2;
  --color-tag-bg: #F0F2F5;
  --color-tag-text: #4A5568;
  --color-accent-light: #FDF3E8;
  --color-secondary-light: #EAF2EE;
  --font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, 'Segoe UI', sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

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

/* ==========================================================================
   layout — 页头、页脚、主容器、面包屑、页面标题区
   ========================================================================== */

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

.header-inner {
  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 {
  flex-shrink: 0;
}

.brand a {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

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

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

.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  position: relative;
}

.nav-list li a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-normal);
}

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

.nav-list li a:hover::after,
.nav-list li a.is-current::after {
  transform: scaleX(1);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.btn-post {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-card);
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-post:hover {
  background-color: #9A5A15;
  color: var(--color-card);
  transform: translateY(-1px);
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 28px 24px 64px;
}

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

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

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

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

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

.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 760px;
}

.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
}

.footer-brand h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.footer-nav h3,
.footer-boundary h3 {
  font-size: 15px;
  margin-bottom: 14px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

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

.footer-boundary p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   components — 通用组件：按钮、卡片、标签、折叠、时间轴、图
   ========================================================================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-card);
  background-color: var(--color-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: #255A42;
  color: var(--color-card);
  transform: translateY(-1px);
}

.btn-more {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.btn-more:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  position: relative;
  padding-left: 14px;
}

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

.section-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--color-tag-text);
  background-color: var(--color-tag-bg);
  border-radius: 20px;
  line-height: 1.5;
}

.board-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--color-secondary);
  background-color: var(--color-secondary-light);
  border-radius: 20px;
  line-height: 1.5;
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

.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;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

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

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

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

.content-media {
  margin: 24px 0;
}

.content-media img {
  width: 100%;
  border-radius: var(--radius-md);
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 8px;
}

.content-media-inline {
  margin: 16px 0 24px;
}

/* ==========================================================================
   components — 首页专属模块
   ========================================================================== */

.hero-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

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

.hero-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-scene {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.scene-figure {
  margin-bottom: 20px;
}

.scene-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.scene-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 8px;
}

.scene-select .scene-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}

.scene-option {
  display: block;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.scene-option:last-child {
  margin-bottom: 0;
}

.scene-option:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.focus-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.focus-announce {
  background-color: var(--color-accent-light);
  border: 1px solid #F0D9BE;
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.focus-announce .section-title {
  font-size: 16px;
  margin-bottom: 10px;
  padding-left: 0;
}

.focus-announce .section-title::before {
  display: none;
}

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

.hot-topic-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-card);
}

.topic-title {
  font-size: 17px;
  margin-bottom: 8px;
}

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

.boards-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.board-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.board-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.board-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

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

.board-card h3 {
  padding: 16px 16px 0;
  font-size: 17px;
}

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

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

.board-card p {
  padding: 8px 16px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.timeline-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

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

.timeline-item {
  display: grid;
  grid-template-columns: 130px 1fr auto auto;
  gap: 16px;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

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

.timeline-item:hover {
  background-color: var(--color-bg);
}

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

.timeline-topic {
  font-size: 15px;
  font-weight: 600;
}

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

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

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

.hot-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

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

.hot-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hot-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.hot-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.hot-item h3 a {
  color: var(--color-text);
}

.hot-item h3 a:hover {
  color: var(--color-accent);
}

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

.hot-preview-section .btn-more {
  margin-top: 8px;
}

.special-preview-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

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

.special-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.special-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

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

.special-card h3 {
  padding: 16px 20px 0;
  font-size: 17px;
}

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

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

.special-card p {
  padding: 8px 20px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.guide-rules-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

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

.entry-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.entry-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.entry-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

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

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

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

.faq-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

/* ==========================================================================
   pages — 版块导航页
   ========================================================================== */

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

.board-groups .section-title {
  margin-bottom: 28px;
}

.board-group {
  margin-bottom: 36px;
}

.group-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

.board-group .board-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  margin-bottom: 16px;
}

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

.board-info {
  padding: 20px 24px;
}

.board-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.board-name a {
  color: var(--color-text);
}

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

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

.board-fit {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.board-fit strong {
  color: var(--color-text);
  font-weight: 600;
}

.board-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.post-tip {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.post-tip .section-title {
  font-size: 17px;
  margin-bottom: 14px;
}

.tip-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.tip-content a {
  font-weight: 600;
}

/* ==========================================================================
   pages — 热议榜页
   ========================================================================== */

.layout-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

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

.hot-rank-section .section-title {
  margin-bottom: 20px;
}

.hot-rank-list {
  counter-reset: rank;
}

.hot-rank-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

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

.rank-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.4;
}

.rank-body {
  min-width: 0;
}

.rank-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

.rank-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

.rank-heat {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-muted);
}

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

.tag-sidebar {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.tag-sidebar h2 {
  font-size: 16px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-list li a {
  display: inline-block;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--color-tag-text);
  background-color: var(--color-tag-bg);
  border-radius: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.participate-tip {
  background-color: var(--color-accent-light);
  border: 1px solid #F0D9BE;
  border-radius: var(--radius-md);
  padding: 20px;
}

.participate-tip h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

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

.participate-tip a {
  font-weight: 600;
}

/* ==========================================================================
   pages — 专题讨论页
   ========================================================================== */

.special-grid {
  margin-bottom: 48px;
}

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

.special-grid-inner .special-card {
  display: flex;
  flex-direction: column;
}

.special-grid-inner .special-card img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}

.special-card-body {
  padding: 16px 20px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.special-card-body h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding: 0;
}

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

.special-card-body h3 a:hover {
  color: var(--color-accent);
}

.special-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 10px;
}

.special-scope {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.special-scope strong {
  color: var(--color-text);
  font-weight: 600;
}

.special-card-body > a {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.topic-summary {
  margin-bottom: 48px;
}

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

.topic-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.topic-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.topic-item h3 a {
  color: var(--color-text);
}

.topic-item h3 a:hover {
  color: var(--color-accent);
}

.topic-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

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

.topic-item > a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.special-recommend {
  margin-bottom: 48px;
}

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

.recommend-card {
  background-color: var(--color-secondary-light);
  border: 1px solid #D5E4DC;
  border-radius: var(--radius-md);
  padding: 20px;
}

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

.recommend-info h3 a {
  color: var(--color-text);
}

.recommend-info h3 a:hover {
  color: var(--color-accent);
}

.recommend-info p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 10px;
}

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

.guide-entry {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.guide-entry .section-title {
  font-size: 17px;
  margin-bottom: 10px;
}

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

.guide-entry a {
  font-weight: 600;
}

/* ==========================================================================
   pages — 新手指南页
   ========================================================================== */

.guide-section {
  margin-bottom: 40px;
}

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

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  align-items: start;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.step-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.step-content h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.guide-post-anchor {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.guide-post-anchor h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.guide-post-anchor p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.guide-post-anchor a {
  font-weight: 600;
}

.checklist {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.check-icon {
  flex-shrink: 0;
  font-size: 16px;
  color: var(--color-secondary);
  line-height: 1.5;
}

.civility-tips {
  background-color: var(--color-accent-light);
  border: 1px solid #F0D9BE;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.civility-tips h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.reply-rules-content {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

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

.mistake-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.guide-figure {
  margin: 8px 0 32px;
}

.guide-figure img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 8px;
}

/* ==========================================================================
   pages — 社区公约页
   ========================================================================== */

.chapter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.chapter-link {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.rule-sections {
  margin-bottom: 40px;
}

.rule-chapter {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 20px;
}

.rule-chapter h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}

.rule-list {
  padding-left: 4px;
}

.rule-list li {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 6px 0;
  position: relative;
}

.rule-chapter ol.rule-list {
  list-style: decimal;
  padding-left: 24px;
}

.rule-chapter ul.rule-list {
  list-style: disc;
  padding-left: 24px;
}

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

.rule-chapter p strong {
  color: var(--color-text);
}

.rule-related {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

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

.rule-related a {
  font-weight: 600;
}

/* ==========================================================================
   pages — 常见问题页
   ========================================================================== */

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

.faq-group {
  margin-bottom: 36px;
}

.faq-group-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

.faq-group .faq-list {
  gap: 12px;
}

.contact-note {
  background-color: var(--color-secondary-light);
  border: 1px solid #D5E4DC;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.contact-note-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.contact-note-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.contact-note-body a {
  font-weight: 600;
}

.faq-figure {
  margin-bottom: 32px;
}

.faq-figure img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.faq-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 8px;
}

/* ==========================================================================
   pages — 404 页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

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

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

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

.btn-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-card);
  background-color: var(--color-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-home:hover {
  background-color: #255A42;
  color: var(--color-card);
  transform: translateY(-1px);
}

/* ==========================================================================
   responsive — 响应式断点
   ========================================================================== */

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

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

  .hero-section {
    gap: 32px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-boundary {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: 60px;
    flex-wrap: wrap;
    padding: 10px 16px;
    gap: 8px;
  }

  .nav-toggle {
    display: flex;
    order: 3;
    margin-left: auto;
  }

  .site-nav {
    flex-basis: 100%;
    order: 4;
    justify-content: flex-start;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 12px 0;
    border-top: 1px solid var(--color-border);
  }

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

  .nav-list li a {
    padding: 12px 8px;
    border-radius: var(--radius-sm);
  }

  .nav-list li a::after {
    display: none;
  }

  .btn-post {
    order: 2;
    margin-left: auto;
    padding: 8px 16px;
  }

  .brand {
    order: 1;
  }

  .inner-main {
    padding: 20px 16px 48px;
  }

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

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

  .hero-section {
    grid-template-columns: 1fr;
    padding: 32px 16px 32px;
    gap: 28px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-slogan {
    font-size: 16px;
  }

  .hero-desc {
    font-size: 14px;
  }

  .focus-section {
    grid-template-columns: 1fr;
    padding: 0 16px 32px;
    gap: 16px;
  }

  .boards-section {
    padding: 0 16px 40px;
  }

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

  .timeline-section {
    padding: 0 16px 40px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 16px;
  }

  .timeline-time {
    font-size: 12px;
  }

  .timeline-topic {
    font-size: 15px;
  }

  .reply-count {
    font-size: 12px;
  }

  .hot-preview-section {
    padding: 0 16px 40px;
  }

  .hot-preview-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .special-preview-section {
    padding: 0 16px 40px;
  }

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

  .guide-rules-section {
    padding: 0 16px 40px;
  }

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

  .faq-section {
    padding: 0 16px 48px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 24px;
  }

  .footer-boundary {
    grid-column: auto;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .side-col {
    order: 2;
  }

  .main-col {
    order: 1;
  }

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

  .topic-summary-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .board-img {
    height: 160px;
    min-height: 0;
  }

  .step-item {
    grid-template-columns: 44px 1fr;
    gap: 14px;
    padding: 16px;
  }

  .step-number {
    font-size: 22px;
  }

  .rule-chapter {
    padding: 20px;
  }

  .chapter-nav {
    gap: 8px;
    padding: 12px;
  }

  .chapter-link {
    padding: 5px 12px;
    font-size: 13px;
  }

  .error-main {
    padding: 48px 16px;
  }

  .error-code {
    font-size: 52px;
  }
}

@media (max-width: 390px) {
  .header-inner {
    padding: 8px 12px;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-tag {
    display: none;
  }

  .btn-post {
    padding: 8px 14px;
    font-size: 13px;
  }

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

  .hero-desc {
    font-size: 14px;
  }

  .section-title {
    font-size: 19px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .board-card h3 {
    font-size: 16px;
  }

  .board-card p {
    font-size: 13px;
  }

  .hot-item h3 {
    font-size: 15px;
  }

  .hot-item p {
    font-size: 13px;
  }

  .entry-card h3 {
    font-size: 16px;
  }

  .entry-card p {
    font-size: 13px;
  }

  .page-title {
    font-size: 23px;
  }

  .faq-item summary {
    font-size: 14px;
    padding: 14px 40px 14px 16px;
  }

  .faq-item summary::after {
    right: 14px;
  }

  .faq-item p {
    font-size: 13px;
    padding: 12px 16px;
  }

  .faq-answer {
    padding: 0 16px 12px;
  }

  .faq-answer p {
    padding: 12px 0 0;
  }

  .step-content h3 {
    font-size: 15px;
  }

  .step-content p {
    font-size: 13px;
  }

  .rule-chapter h2 {
    font-size: 18px;
  }

  .rule-list li {
    font-size: 13px;
  }

  .hot-rank-item {
    grid-template-columns: 36px 1fr;
    gap: 12px;
  }

  .rank-num {
    font-size: 17px;
  }

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

  .rank-desc {
    font-size: 13px;
  }

  .error-code {
    font-size: 44px;
  }
}