/* ==========================================================================
   每日大赛mrds · 整站样式表
   技术工作台风格：中性灰底、白卡片、紧凑控件、状态清楚
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Base — 基础变量、重置、全局元素
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #f5f6f8;
  --color-card: #ffffff;
  --color-text: #1f2933;
  --color-text-secondary: #5f6b7a;
  --color-text-muted: #8a94a3;
  --color-blue: #2563eb;
  --color-blue-dark: #1d4ed8;
  --color-blue-light: #eff6ff;
  --color-green: #0e9f6e;
  --color-green-light: #ecfdf5;
  --color-red: #dc2626;
  --color-red-light: #fef2f2;
  --color-border: #e4e7eb;
  --color-border-light: #eef0f3;
  --color-hover-bg: #f8fafc;

  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;

  --container-width: 1200px;
  --container-padding: 24px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-height: 60px;
  --transition-fast: 0.15s ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  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-blue);
  text-decoration: none;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

p {
  margin: 0 0 12px;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 8px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

figure {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}

/* --------------------------------------------------------------------------
   2. Layout — 全站布局骨架：页头、页脚、主容器、面包屑
   -------------------------------------------------------------------------- */

/* --- 页头 --- */
.site-header {
  background: 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 var(--container-padding);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
}

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

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

.nav-list li {
  position: relative;
}

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

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

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

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--color-blue);
  border-radius: 1px;
}

.nav-guide-link a {
  color: var(--color-blue);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: var(--radius-md);
  margin-left: 8px;
}

.nav-guide-link a:hover {
  background: var(--color-blue-light);
  border-color: var(--color-blue);
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --- 主内容容器 --- */
.site-main {
  min-height: 60vh;
}

.home-main {
  padding-bottom: 48px;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 26px;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-bottom: 0;
}

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

.footer-top {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-padding) 28px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-brand-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-brand p:not(.footer-brand-name) {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.footer-links ul li {
  margin-bottom: 6px;
}

.footer-links ul a {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer-links ul a:hover {
  color: var(--color-blue);
}

.footer-note p:last-child {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

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

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 14px var(--container-padding);
  font-size: 12px;
  color: var(--color-text-muted);
}

/* 通用布局壳 */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-layout {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 32px;
  align-items: start;
}

/* 侧栏在左侧：用于 guide / rules / help */
.sidebar-left {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: 32px;
  align-items: start;
}

/* 侧栏在右侧：用于 hot-topics */
.sidebar-right {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 32px;
  align-items: start;
}

/* 通用侧栏 */
.sidebar {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sidebar-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-note {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 14px;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   3. Components — 通用组件
   -------------------------------------------------------------------------- */

/* --- 文本链接 --- */
.text-link {
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform var(--transition-fast);
}

.text-link:hover::after {
  transform: translateX(2px);
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  padding: 9px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary {
  background: var(--color-blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-blue-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--color-card);
  color: var(--color-blue);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-blue);
  background: var(--color-blue-light);
}

.btn-post {
  padding: 8px 18px;
  font-size: 13px;
}

/* --- 区块标题 --- */
.section-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 0;
}

.section-kicker {
  font-size: 12px;
  color: var(--color-blue);
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

/* --- 内容图片 --- */
.content-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

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

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

.content-media-inline {
  margin: 20px 0;
}

/* --- FAQ 手风琴 --- */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-card);
  margin-bottom: 10px;
}

.faq-item summary {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 18px;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

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

.faq-item p {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* --- 发帖引导条 --- */
.post-guide-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-blue-light);
  border: 1px solid #dbeafe;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

/* --- 公告与规则侧卡 --- */
.side-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.side-card h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.notice-list li,
.rule-quick-list li {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.notice-list li::before,
.rule-quick-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-blue);
  font-weight: 600;
}

.side-card .text-link {
  margin-top: 12px;
}

/* --------------------------------------------------------------------------
   4. Pages — 首页
   -------------------------------------------------------------------------- */

/* --- 首屏 hero 区 --- */
.hero-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 28px 0 8px;
  align-items: start;
}

.hero-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

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

.hero-content .section-heading h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
}

.hero-content .section-heading p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

/* 版块矩阵 */
.board-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.board-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--color-hover-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.board-card:hover {
  border-color: var(--color-blue);
  background: var(--color-blue-light);
}

.board-icon {
  font-size: 22px;
  line-height: 1;
  margin-bottom: 6px;
}

.board-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.board-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* 首屏侧栏 */
.hero-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* --- 全站热帖列表 --- */
.hot-posts-section {
  margin-top: 40px;
}

.hot-posts-list {
  display: grid;
  gap: 0;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.post-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border-light);
}

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

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

.post-rank {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-blue);
  width: 32px;
  flex-shrink: 0;
  text-align: center;
}

.post-rank:nth-child(1) {
  color: var(--color-red);
}

.post-main {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.post-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.post-board-label {
  font-size: 12px;
  color: var(--color-blue);
  background: var(--color-blue-light);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  flex-shrink: 0;
}

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

/* --- 社区定位说明 --- */
.positioning-section {
  margin-top: 40px;
}

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

.positioning-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.positioning-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

/* --- 新手指南摘要 --- */
.guide-summary-section {
  margin-top: 40px;
}

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

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

.guide-step .step-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
  background: var(--color-blue-light);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin-bottom: 10px;
}

.guide-step h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

/* --- 规则摘要与反馈入口 --- */
.rules-feedback-section {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.rules-summary,
.feedback-summary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.rules-summary h2,
.feedback-summary h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 14px;
}

.rules-summary-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.rules-summary-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-green);
  font-weight: 600;
}

.feedback-summary p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feedback-summary .text-link {
  margin-top: 12px;
}

/* --------------------------------------------------------------------------
   5. Pages — 每日赛事（daily-race）
   -------------------------------------------------------------------------- */

.page-daily-race .page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.page-daily-race .page-header .btn-post {
  flex-shrink: 0;
  margin-top: 4px;
}

/* 时间线 */
.timeline-list {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
}

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

.timeline-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-muted);
  padding-top: 2px;
}

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

.topic-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--color-text);
}

.topic-excerpt {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.topic-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tag {
  display: inline-block;
  font-size: 12px;
  border-radius: var(--radius-sm);
  padding: 2px 8px;
}

.tag-replies {
  background: var(--color-hover-bg);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* 发帖引导条 */
.post-guide-banner {
  background: var(--color-blue-light);
  border: 1px solid #dbeafe;
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 8px;
}

.post-guide-banner .section-title {
  font-size: 16px;
}

.post-guide-banner p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.post-guide-banner p a {
  margin-right: 12px;
}

/* 热度标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud li a {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-secondary);
  background: var(--color-hover-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  transition: all var(--transition-fast);
}

.tag-cloud li a:hover {
  color: var(--color-blue);
  border-color: var(--color-blue);
  background: var(--color-blue-light);
}

.sidebar-image {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   6. Pages — 校园大赛（campus-contest）
   -------------------------------------------------------------------------- */

/* 版块头横幅 */
.board-hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 28px;
  align-items: center;
}

.board-hero-copy h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.board-hero-copy p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

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

/* 阶段标签 */
.stage-tab-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stage-tab {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: border-color var(--transition-fast);
}

.stage-tab:hover {
  border-color: var(--color-blue);
}

.stage-tab h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.stage-tab p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

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

.topic-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition-fast);
}

.topic-card:hover {
  border-color: var(--color-blue);
}

.topic-card-tag {
  font-size: 12px;
  color: var(--color-blue);
  background: var(--color-blue-light);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  align-self: flex-start;
}

.topic-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 0;
}

.topic-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
  flex: 1;
}

.topic-card a {
  font-size: 13px;
  font-weight: 500;
}

/* 参赛经验入口 */
.experience-entry {
  margin-bottom: 28px;
}

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

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

.entry-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.entry-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.entry-card a {
  font-size: 13px;
  font-weight: 500;
}

/* 规则摘要（内页底部） */
.rules-summary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 8px;
}

.rules-summary h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

.rules-summary ul li {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 5px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.rules-summary ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-blue);
  font-weight: 600;
}

.rules-summary .text-link {
  margin-top: 12px;
}

/* --------------------------------------------------------------------------
   7. Pages — 吃瓜爆料（baoliao）
   -------------------------------------------------------------------------- */

.page-baoliao .page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.page-baoliao .page-header .btn {
  flex-shrink: 0;
  margin-top: 4px;
}

/* 话题流 */
.topic-stream {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.topic-stream > h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

.topic-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.topic-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.topic-status {
  display: inline-block;
  font-size: 12px;
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-weight: 500;
}

.status-verifying {
  background: #fffbeb;
  color: #b45309;
}

.status-discussing {
  background: var(--color-blue-light);
  color: var(--color-blue);
}

.status-verified {
  background: var(--color-green-light);
  color: var(--color-green);
}

.topic-item h3 {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.topic-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.topic-item a {
  font-size: 13px;
  font-weight: 500;
}

/* 求证原则 */
.verify-principles {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.verify-principles > h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.principle-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.principle-list h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.principle-list p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
}

/* 侧栏链接卡 */
.side-link-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.side-link-card h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.side-link-card ul li {
  padding: 6px 0;
}

.side-link-card ul a {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.side-link-card ul a:hover {
  color: var(--color-blue);
}

/* 内容规范提示条 */
.content-notice {
  background: var(--color-red-light);
  border: 1px solid #fecaca;
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-top: 24px;
}

.notice-inner h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-red);
  margin-bottom: 6px;
}

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

/* --------------------------------------------------------------------------
   8. Pages — 热帖排行（hot-topics）
   -------------------------------------------------------------------------- */

/* 维度标签区 */
.rank-tabs-section {
  margin-bottom: 24px;
}

.rank-tabs-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.rank-tabs-head .section-title {
  margin-bottom: 0;
}

.rank-tabs {
  display: flex;
  gap: 4px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 4px;
}

.rank-tab {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.rank-tab:hover {
  color: var(--color-text);
  background: var(--color-hover-bg);
}

.rank-tab.is-active {
  background: var(--color-blue);
  color: #fff;
}

.tabs-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 排行列表 */
.rank-list-wrap {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.rank-list-section > .section-title {
  margin-bottom: 16px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border-light);
}

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

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

.rank-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-blue);
  width: 28px;
  flex-shrink: 0;
  text-align: center;
}

.rank-num:nth-child(1) {
  color: var(--color-red);
}

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

.rank-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 2px;
}

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

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

.rank-tag {
  display: inline-block;
  font-size: 12px;
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  margin-right: 6px;
}

.tag-daily {
  background: var(--color-blue-light);
  color: var(--color-blue);
}

.tag-campus {
  background: var(--color-green-light);
  color: var(--color-green);
}

.tag-baoliao {
  background: #fffbeb;
  color: #b45309;
}

.rank-heat {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  text-align: right;
}

.rank-time {
  display: block;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* 数据说明侧栏 */
.aside-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.aside-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.rank-data-list {
  margin: 0;
}

.rank-data-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

.rank-data-item dt {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.rank-data-item dd {
  font-size: 13px;
  font-family: var(--font-mono);
  margin: 0;
  color: var(--color-text);
}

.rank-figure img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.rank-figure figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 6px;
  line-height: 1.5;
}

/* 相关推荐 */
.rank-related {
  margin-top: 32px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.related-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: border-color var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-blue);
}

.related-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.related-card p {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   9. Pages — 新手指南（guide）
   -------------------------------------------------------------------------- */

/* 左侧目录 */
.guide-toc {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.guide-toc > h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.guide-toc > ul li {
  padding: 6px 0;
}

.guide-toc > ul a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.guide-toc > ul a:hover {
  color: var(--color-blue);
}

.toc-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border-light);
}

.toc-note h3 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

.toc-note ul li {
  padding: 4px 0;
}

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

.toc-note ul a:hover {
  color: var(--color-blue);
}

/* 右侧内容 */
.guide-content {
  min-width: 0;
}

.guide-step {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.guide-step > h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

.guide-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 16px 0;
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 12px;
}

.guide-list {
  margin: 12px 0;
}

.guide-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.guide-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-blue);
  font-weight: 600;
}

.guide-list strong {
  color: var(--color-text);
  font-weight: 600;
}

/* FAQ 区 */
.guide-faq-section {
  margin-top: 32px;
}

.guide-faq-section > h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
}

.faq-grid {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: 24px;
  align-items: start;
}

.faq-intro p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.faq-intro a {
  font-size: 14px;
  font-weight: 500;
}

/* 礼仪摘要 */
.etiquette-summary {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 24px;
}

.etiquette-summary h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

.etiquette-summary ul li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.etiquette-summary ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-green);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   10. Pages — 社区规则（rules）
   -------------------------------------------------------------------------- */

.chapter-nav {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.chapter-nav .sidebar-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.chapter-nav ul li {
  padding: 6px 0;
}

.chapter-nav ul a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.chapter-nav ul a:hover {
  color: var(--color-blue);
}

/* 规则正文 */
.content-area {
  min-width: 0;
}

.rules-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 8px;
}

.rules-media figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 24px;
}

.rules-section {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.rules-section > h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.rules-section > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.rule-list,
.boundary-list {
  margin: 12px 0;
}

.rule-list li,
.boundary-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  line-height: 1.6;
  border-bottom: 1px solid var(--color-border-light);
}

.rule-list li:last-child,
.boundary-list li:last-child {
  border-bottom: none;
}

.rule-list li::before {
  content: "·";
  position: absolute;
  left: 8px;
  color: var(--color-blue);
  font-weight: 600;
  font-size: 18px;
}

.boundary-list li::before {
  content: "!";
  position: absolute;
  left: 6px;
  color: var(--color-red);
  font-weight: 600;
}

.rule-list strong,
.boundary-list strong {
  color: var(--color-text);
  font-weight: 600;
}

.process-list {
  margin: 12px 0;
  counter-reset: process;
}

.process-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 10px 0;
  padding-left: 36px;
  position: relative;
  line-height: 1.6;
  border-bottom: 1px solid var(--color-border-light);
  counter-increment: process;
}

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

.process-list li::before {
  content: counter(process);
  position: absolute;
  left: 0;
  top: 10px;
  width: 24px;
  height: 24px;
  background: var(--color-blue-light);
  color: var(--color-blue);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.process-list strong {
  color: var(--color-text);
  font-weight: 600;
}

/* 规范提示条 */
.rules-note-strip {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin: 24px 0;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.rules-note-strip p {
  margin-bottom: 0;
}

.rules-note-strip strong {
  color: #b45309;
}

.rules-note-strip a {
  margin: 0 8px;
  font-size: 13px;
}

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

.related-links-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-right: 8px;
}

.related-links-item {
  font-size: 13px;
  color: var(--color-text-secondary);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
}

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

/* --------------------------------------------------------------------------
   11. Pages — 反馈帮助（help）
   -------------------------------------------------------------------------- */

.help-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.sidebar-card h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-card-tight {
  padding: 16px 20px;
}

.faq-index-list li {
  padding: 6px 0;
}

.faq-index-list a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.faq-index-list a:hover {
  color: var(--color-blue);
}

.sidebar-link-list li {
  padding: 5px 0;
}

.sidebar-link-list a {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.sidebar-link-list a:hover {
  color: var(--color-blue);
}

/* 主内容区 */
.help-main-content {
  min-width: 0;
}

.troubleshoot-section,
.faq-section,
.policy-feedback-section {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.troubleshoot-section > h2,
.faq-section > h2,
.policy-feedback-section > h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

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

.step-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border-light);
  counter-increment: step;
}

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

.step-head {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  padding-left: 32px;
  position: relative;
}

.step-head::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 22px;
  height: 22px;
  background: var(--color-blue-light);
  color: var(--color-blue);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-item p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding-left: 32px;
  margin-bottom: 0;
}

/* FAQ 分组 */
.faq-group {
  margin-bottom: 20px;
}

.faq-group h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

/* 政策与反馈 */
.policy-block,
.feedback-block {
  margin-bottom: 20px;
}

.policy-block h3,
.feedback-block h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.policy-block p,
.feedback-block p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feedback-tip {
  background: var(--color-blue-light);
  border: 1px solid #dbeafe;
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

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

/* --------------------------------------------------------------------------
   12. Pages — 404
   -------------------------------------------------------------------------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 24px;
}

.error-panel {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  max-width: 460px;
  width: 100%;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 600;
  color: var(--color-blue);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.error-back {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--color-blue);
  border-radius: var(--radius-md);
  padding: 9px 24px;
}

.error-back:hover {
  background: var(--color-blue-dark);
  color: #fff;
}

/* --------------------------------------------------------------------------
   13. Responsive — 响应式断点
   -------------------------------------------------------------------------- */

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

  .hero-media img {
    height: 220px;
  }

  .hero-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

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

  .sidebar-right {
    grid-template-columns: 1fr;
  }

  .sidebar-left {
    grid-template-columns: 1fr;
  }

  .guide-toc,
  .chapter-nav,
  .help-sidebar {
    position: static;
  }

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

  .stage-tab-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

/* --- 768px：小平板 / 大手机 --- */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-height);
    padding-top: 8px;
    padding-bottom: 8px;
    gap: 8px;
  }

  .brand-slogan {
    display: none;
  }

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

  .site-nav {
    width: 100%;
    order: 3;
    flex-basis: 100%;
  }

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

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

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

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

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

  .nav-list a.is-current {
    background: var(--color-blue-light);
  }

  .nav-guide-link a {
    margin-left: 0;
    margin-top: 4px;
    border: none;
    padding: 12px 8px;
  }

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

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

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

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

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

  .board-hero-media img {
    height: 160px;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .post-guide-banner p a {
    display: inline-block;
    margin-bottom: 8px;
  }

  .rank-tabs-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .rank-tabs {
    width: 100%;
    overflow-x: auto;
  }

  .rank-tab {
    flex-shrink: 0;
  }

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

/* --- 576px：手机 --- */
@media (max-width: 576px) {
  :root {
    --container-padding: 16px;
  }

  .header-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-name {
    font-size: 16px;
  }

  .page-title {
    font-size: 22px;
  }

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

  .hot-posts-list {
    border-radius: var(--radius-md);
  }

  .post-item {
    flex-wrap: wrap;
    gap: 8px 12px;
    padding: 12px 14px;
  }

  .post-main {
    flex: 1 1 100%;
    order: 2;
  }

  .post-rank {
    order: 1;
  }

  .post-meta {
    order: 3;
    width: 100%;
    padding-left: 48px;
  }

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

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

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

  .rank-item {
    flex-wrap: wrap;
    gap: 6px 12px;
    padding: 12px 14px;
  }

  .rank-content {
    flex: 1 1 calc(100% - 60px);
    order: 2;
  }

  .rank-num {
    order: 1;
  }

  .rank-heat {
    order: 3;
    width: 100%;
    padding-left: 44px;
    text-align: left;
  }

  .guide-step {
    padding: 20px;
  }

  .rules-section {
    padding: 20px;
  }

  .troubleshoot-section,
  .faq-section,
  .policy-feedback-section {
    padding: 20px;
  }

  .error-panel {
    padding: 32px 20px;
  }

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

  .footer-bottom p {
    text-align: center;
  }
}

/* --- 滚动出现动画（不阻塞初始可见性） --- */
@media (prefers-reduced-motion: no-preference) {
  .board-card,
  .post-item,
  .positioning-item,
  .guide-step,
  .topic-card,
  .timeline-item,
  .topic-item,
  .rank-item,
  .stage-tab,
  .entry-card {
    animation: fade-in 0.4s ease both;
  }

  .board-card:nth-child(2),
  .post-item:nth-child(2),
  .positioning-item:nth-child(2),
  .guide-step:nth-child(2),
  .topic-card:nth-child(2),
  .timeline-item:nth-child(2),
  .topic-item:nth-child(2),
  .rank-item:nth-child(2),
  .stage-tab:nth-child(2) {
    animation-delay: 0.05s;
  }

  .board-card:nth-child(3),
  .post-item:nth-child(3),
  .positioning-item:nth-child(3),
  .guide-step:nth-child(3),
  .topic-card:nth-child(3),
  .timeline-item:nth-child(3),
  .topic-item:nth-child(3),
  .rank-item:nth-child(3),
  .stage-tab:nth-child(3) {
    animation-delay: 0.1s;
  }

  .board-card:nth-child(4),
  .post-item:nth-child(4),
  .topic-card:nth-child(4),
  .timeline-item:nth-child(4),
  .topic-item:nth-child(4),
  .rank-item:nth-child(4),
  .stage-tab:nth-child(4) {
    animation-delay: 0.15s;
  }

  .post-item:nth-child(5),
  .topic-card:nth-child(5),
  .timeline-item:nth-child(5),
  .topic-item:nth-child(5),
  .rank-item:nth-child(5) {
    animation-delay: 0.2s;
  }

  .post-item:nth-child(6),
  .topic-card:nth-child(6),
  .timeline-item:nth-child(6),
  .topic-item:nth-child(6),
  .rank-item:nth-child(6) {
    animation-delay: 0.25s;
  }

  @keyframes fade-in {
    from {
      opacity: 0;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}