/* ============================================================
   BASE — 全局基础
   ============================================================ */
:root {
  --bg: #f7f5f2;
  --text: #2b2b2b;
  --text-light: #5a5a5a;
  --primary: #1f3a5f;
  --primary-light: #2d4f7a;
  --accent: #c26a1a;
  --danger: #b3261e;
  --tag-bg: #e9ecef;
  --white: #ffffff;
  --border: #dedcd7;
  --border-light: #ecebe7;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container: 1200px;
  --gap: 24px;
  --font-stack: -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%;
}

body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

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

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

.site-main {
  flex: 1;
}

/* ============================================================
   LAYOUT — 全站骨架
   ============================================================ */
.site-header {
  background-color: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.5px;
}

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

.site-nav {
  display: block;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.nav-list li a.is-current {
  color: var(--primary);
  font-weight: 600;
  background-color: rgba(31, 58, 95, 0.08);
}

.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(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

.footer-col h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text);
}

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

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

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

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

.footer-brand strong {
  display: block;
  font-size: 17px;
  color: var(--primary);
  margin-bottom: 8px;
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gap);
  border-top: 1px solid var(--border-light);
  text-align: center;
}

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

/* ============================================================
   COMPONENTS — 通用组件
   ============================================================ */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  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;
}

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

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

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

.btn-secondary:hover {
  background-color: rgba(31, 58, 95, 0.06);
  color: var(--primary);
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text);
  position: relative;
  padding-bottom: 10px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  background-color: var(--primary);
  border-radius: 2px;
}

.more-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  margin-top: 16px;
  color: var(--primary);
}

.more-link:hover {
  color: var(--accent);
}

.text-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

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

/* 面包屑 */
.breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gap) 0;
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

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

.breadcrumb-sep {
  color: #a0a0a0;
}

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

/* 页面标题区 */
.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gap) 48px;
  width: 100%;
}

.page-header {
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 10px;
}

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

/* 图片容器约束 */
figure {
  margin: 0;
}

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

/* ============================================================
   PAGES — 首页
   ============================================================ */
.home-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gap) 48px;
  width: 100%;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  padding: 48px 0 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-lead {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 560px;
}

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

.hero-image {
  margin-top: 28px;
  border-radius: var(--radius-lg);
  max-width: 480px;
}

.hero-notice {
  background-color: rgba(179, 38, 30, 0.05);
  border: 1px solid rgba(179, 38, 30, 0.2);
  border-left: 4px solid var(--danger);
  border-radius: var(--radius-md);
  padding: 24px;
}

.hero-notice h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--danger);
  margin-bottom: 14px;
}

.hero-notice ul {
  margin-bottom: 16px;
}

.hero-notice ul li {
  font-size: 14px;
  color: var(--text);
  line-height: 1.6;
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.hero-notice ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--danger);
  font-weight: 700;
}

.hero-notice a {
  font-size: 14px;
  font-weight: 600;
  color: var(--danger);
}

.content-media-primary {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

.content-media-primary figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-light);
  background-color: var(--white);
}

/* 版块导航带 */
.board-nav-strip {
  padding: 32px 0;
  border-top: 1px solid var(--border-light);
}

.board-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.board-strip-item {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.board-strip-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.board-strip-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.board-strip-item p {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 10px;
}

.board-strip-item a {
  font-size: 13px;
  font-weight: 600;
}

/* 首页主体双栏 */
.layout-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  padding: 40px 0;
}

.board-aside {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  align-self: start;
}

.board-aside h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

.board-side-list > li {
  margin-bottom: 8px;
}

.board-side-list > li > a {
  display: block;
  padding: 8px 12px;
  background-color: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
}

.board-side-list > li > a:hover {
  background-color: rgba(31, 58, 95, 0.08);
  color: var(--primary);
}

.sub-board {
  padding: 6px 0 6px 16px;
}

.sub-board li a {
  display: block;
  padding: 5px 8px;
  font-size: 13px;
  color: var(--text-light);
}

.sub-board li a:hover {
  color: var(--primary);
}

/* 最近话题 */
.recent-topics {
  min-width: 0;
}

.topic-list li {
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}

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

.topic-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--tag-bg);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.topic-list h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

.topic-list h3 a:hover {
  color: var(--primary);
}

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

/* 活动预览 */
.activity-preview {
  padding: 32px 0;
  border-top: 1px solid var(--border-light);
}

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

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

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

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

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

.activity-card a {
  font-size: 14px;
  font-weight: 600;
}

/* 往期回顾预览 */
.retrospective-preview {
  padding: 32px 0;
  border-top: 1px solid var(--border-light);
}

.retro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.retro-group {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}

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

.retro-group ul li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
}

.retro-group ul li:last-child {
  border-bottom: none;
}

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

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

/* 参与指南与版规入口 */
.guide-rules-entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 32px 0;
  border-top: 1px solid var(--border-light);
}

.entry-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.entry-card h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.entry-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}

/* ============================================================
   PAGES — 版块页 banqu
   ============================================================ */
.board-hero-banner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  align-items: center;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.board-hero-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.board-hero-text p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

.board-map {
  margin-bottom: 40px;
}

.section-note {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 20px;
}

.board-map-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

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

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

.board-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.board-card-name {
  font-size: 17px;
  font-weight: 700;
}

.board-card-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--tag-bg);
  padding: 2px 10px;
  border-radius: 999px;
}

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

.board-card-scope,
.board-card-fit {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

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

.board-card-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  padding-top: 8px;
}

.board-guide {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.board-guide-list {
  counter-reset: guide-counter;
}

.board-guide-item {
  position: relative;
  padding: 16px 0 16px 48px;
  border-bottom: 1px solid var(--border-light);
  counter-increment: guide-counter;
}

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

.board-guide-item::before {
  content: counter(guide-counter);
  position: absolute;
  left: 0;
  top: 16px;
  width: 32px;
  height: 32px;
  background-color: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}

.board-guide-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.board-guide-more {
  margin-top: 20px;
  display: flex;
  gap: 16px;
}

.board-guide-more a {
  font-size: 14px;
  font-weight: 600;
}

/* ============================================================
   PAGES — 活动页 huodong
   ============================================================ */
.activity-group {
  margin-bottom: 40px;
}

.activity-group .activity-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 0;
  overflow: hidden;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--white);
}

.activity-media {
  overflow: hidden;
}

.activity-media img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

.activity-content {
  padding: 24px 24px 24px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.activity-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}

.activity-form,
.activity-audience,
.activity-entry {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 6px;
}

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

.activity-path {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.path-table-wrapper {
  overflow-x: auto;
}

.path-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.path-table th {
  text-align: left;
  padding: 12px 16px;
  background-color: var(--bg);
  border-bottom: 2px solid var(--border);
  font-weight: 600;
}

.path-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-light);
  line-height: 1.6;
}

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

.path-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-light);
}

.path-note a {
  font-weight: 600;
}

/* ============================================================
   PAGES — 话题页 huati
   ============================================================ */
.page-layout {
  width: 100%;
}

.layout-with-aside {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.topic-list-section {
  min-width: 0;
}

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

.topic-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow 0.2s ease;
}

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

.topic-card-media {
  overflow: hidden;
  border-radius: var(--radius-sm);
}

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

.topic-card-content {
  min-width: 0;
}

.topic-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

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

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

.topic-direction {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 6px;
}

.topic-direction strong {
  color: var(--text);
  font-weight: 600;
}

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

.topic-related strong {
  color: var(--text);
  font-weight: 600;
}

.topic-filter-aside {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: 84px;
}

.aside-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

.filter-group {
  margin-bottom: 20px;
}

.filter-group-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-light);
}

.filter-list li {
  margin-bottom: 6px;
}

.filter-list li a {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

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

.aside-note {
  background-color: var(--bg);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
}

.aside-note strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
}

.aside-note a {
  font-weight: 600;
}

/* ============================================================
   PAGES — 参与指南 canyu
   ============================================================ */
.step-timeline {
  margin-bottom: 40px;
}

.section-lead {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 24px;
  max-width: 720px;
}

.timeline-media {
  margin-bottom: 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.timeline-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-light);
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-top: none;
}

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

.step-item {
  display: flex;
  gap: 16px;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background-color: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

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

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

.faq-item summary {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  padding-right: 48px;
  list-style: none;
}

.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(--primary);
  transition: transform 0.2s ease;
}

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

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

.faq-answer {
  padding: 16px 24px;
}

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

.faq-answer a {
  font-weight: 600;
}

.boundary-tip {
  background-color: rgba(179, 38, 30, 0.04);
  border: 1px solid rgba(179, 38, 30, 0.15);
  border-radius: var(--radius-md);
  padding: 24px;
}

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

.tip-box strong {
  color: var(--danger);
}

.next-links {
  margin-top: 16px;
}

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

.next-links ul {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.next-links ul li a {
  font-size: 14px;
  font-weight: 600;
}

/* ============================================================
   PAGES — 往期回顾 huigu
   ============================================================ */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.archive-group {
  min-width: 0;
}

.archive-block {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  overflow: hidden;
}

.archive-block-head {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  padding: 20px;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg);
}

.archive-cover {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.archive-block-title h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.archive-list {
  padding: 8px 20px;
}

.archive-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
}

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

.archive-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.archive-item h4 a {
  color: var(--text);
}

.archive-item h4 a:hover {
  color: var(--primary);
}

.archive-point {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 6px;
}

.archive-link {
  font-size: 13px;
  font-weight: 600;
}

.rejoin-entry {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: 84px;
}

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

.rejoin-list li {
  margin-bottom: 10px;
}

.rejoin-list li a {
  display: block;
  padding: 12px;
  background-color: var(--bg);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.rejoin-list li a:hover {
  background-color: rgba(31, 58, 95, 0.08);
}

.rejoin-name {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.rejoin-note {
  display: block;
  font-size: 13px;
  color: var(--text-light);
  margin-top: 2px;
}

/* ============================================================
   PAGES — 版规 guize
   ============================================================ */
.intro-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 32px;
}

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

.intro-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-light);
  background-color: var(--white);
  border: 1px solid var(--border-light);
  border-top: none;
}

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

.rule-section {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}

.rule-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  position: relative;
}

.rule-section h3::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 16px;
  background-color: var(--primary);
  border-radius: 2px;
  margin-right: 10px;
  vertical-align: -2px;
}

.rule-list li {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
}

.rule-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--primary);
  font-weight: 700;
}

.boundary-box {
  background-color: rgba(179, 38, 30, 0.04);
  border: 1px solid rgba(179, 38, 30, 0.2);
  border-left: 4px solid var(--danger);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 32px;
}

.boundary-intro {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.boundary-list li {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
}

.boundary-list li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--danger);
  font-weight: 700;
}

.boundary-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(179, 38, 30, 0.15);
}

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

.boundary-note a {
  font-weight: 600;
  margin-right: 16px;
}

.rule-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.rule-links a {
  font-size: 14px;
  font-weight: 600;
}

/* ============================================================
   PAGES — 404
   ============================================================ */
.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 80px var(--gap);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  text-align: center;
  max-width: 520px;
}

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

.error-content h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.error-tip {
  font-size: 13px;
  color: var(--text-light);
}

/* ============================================================
   RESPONSIVE — 响应式
   ============================================================ */
@media (max-width: 991px) {
  .board-strip-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .layout-shell {
    grid-template-columns: 240px 1fr;
    gap: 24px;
  }

  .activity-group .activity-card {
    grid-template-columns: 220px 1fr;
  }
}

@media (max-width: 767px) {
  .header-inner {
    height: 60px;
    flex-wrap: wrap;
    padding: 0 16px;
    position: relative;
  }

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

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

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

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

  .nav-list li {
    width: 100%;
  }

  .nav-list li a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--border-light);
    border-radius: 0;
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding: 40px 16px 20px;
  }

  .footer-bottom {
    padding: 14px 16px;
  }

  .inner-main,
  .home-main {
    padding: 0 16px 40px;
  }

  .breadcrumb {
    padding: 14px 16px 0;
  }

  .page-header {
    padding: 20px 0 18px;
    margin-bottom: 24px;
  }

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

  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 24px;
  }

  .hero-copy h1 {
    font-size: 26px;
  }

  .hero-image {
    max-width: 100%;
  }

  .content-media-primary img {
    height: 200px;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 0;
  }

  .board-aside {
    order: 2;
  }

  .recent-topics {
    order: 1;
  }

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

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

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

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

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

  .board-hero-figure img {
    height: 180px;
  }

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

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

  .activity-media img {
    min-height: 180px;
    max-height: 220px;
  }

  .activity-content {
    padding: 0 20px 20px;
  }

  .layout-with-aside {
    grid-template-columns: 1fr;
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .topic-filter-aside,
  .rejoin-entry {
    position: static;
  }

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

  .topic-card-media img {
    height: 180px;
  }

  .steps-list {
    grid-template-columns: 1fr;
  }

  .archive-block-head {
    grid-template-columns: 1fr;
  }

  .archive-cover {
    height: 160px;
  }

  .step-timeline .timeline-figure img {
    height: 200px;
  }

  .intro-figure img {
    height: 180px;
  }

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

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

@media (max-width: 480px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .board-guide-list {
    padding-left: 0;
  }

  .board-guide-item {
    padding-left: 44px;
  }

  .path-table {
    font-size: 13px;
  }

  .path-table th,
  .path-table td {
    padding: 10px 12px;
  }

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

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .entry-card {
    padding: 20px;
  }
}