/* ============================================================
   hongweicaifu.cn 全站样式表
   论坛社区风格 · 白底 · 浅灰分区 · 蓝色强调
   ============================================================ */

/* ============================================================
   Base —— 基础变量、重置、字体、通用元素
   ============================================================ */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-bg: #ffffff;
  --color-bg-gray: #f3f4f6;
  --color-bg-gray-light: #f9fafb;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-light: #9ca3af;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-danger: #dc2626;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container-width: 1160px;
  --header-height: 64px;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.75;
  --transition-base: 0.2s ease;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

p {
  color: var(--color-text);
}

strong {
  font-weight: 600;
}

/* ============================================================
   Layout —— 全站骨架：页头、页脚、主容器、面包屑
   ============================================================ */

/* ----- 页头 ----- */
.site-header {
  background-color: var(--color-bg);
  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 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.brand-tag {
  font-size: 12px;
  color: var(--color-text-secondary);
  border-left: 1px solid var(--color-border);
  padding-left: 8px;
  line-height: 1.4;
  display: none;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-md);
  font-weight: 500;
}

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

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

.header-help {
  flex-shrink: 0;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.header-help:hover {
  background-color: var(--color-primary);
  color: #fff;
}

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

.nav-toggle:hover {
  background-color: var(--color-bg-gray);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ----- 主容器 ----- */
.site-main {
  min-height: 60vh;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 64px;
}

/* ----- 面包屑 ----- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 0 20px;
}

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

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

.breadcrumb-sep {
  color: var(--color-text-light);
  user-select: none;
}

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

/* ----- 页脚 ----- */
.site-footer {
  background-color: var(--color-bg-gray);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 40px;
}

.footer-info .footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

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

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

.footer-col h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  text-align: center;
}

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

/* ============================================================
   Components —— 通用组件：卡片、标签、列表、按钮、图片等
   ============================================================ */

/* ----- 模块标题与描述 ----- */
.section-head,
.section-heading {
  margin-bottom: 24px;
}

.section-head h2,
.section-heading h2 {
  margin-bottom: 6px;
}

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

/* ----- 图片容器 ----- */
.content-media {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg-gray);
}

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

.content-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-gray-light);
  border-top: 1px solid var(--color-border-light);
}

.content-media-primary {
  width: 100%;
  max-height: 340px;
  margin: 32px 0;
}

.content-media-primary img {
  height: 340px;
}

.content-media-inline {
  width: 100%;
  max-height: 260px;
  margin: 20px 0;
}

.content-media-inline img {
  height: 260px;
}

/* ----- 话题标签 ----- */
.topic-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  line-height: 1.6;
}

/* ----- 更多链接 ----- */
.more-link {
  display: inline-block;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

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

/* ----- 文本链接 ----- */
.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

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

/* ----- 按钮 ----- */
.btn-primary {
  display: inline-block;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-base);
}

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

.btn-secondary {
  display: inline-block;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-base), color var(--transition-base);
}

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

/* ----- 步骤列表 ----- */
.flow-steps {
  counter-reset: flow-step;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.flow-steps li {
  position: relative;
  padding-left: 40px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

.flow-steps li::before {
  counter-increment: flow-step;
  content: counter(flow-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-steps li a {
  font-size: 14px;
}

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

/* ============================================================
   index.html —— 首页
   ============================================================ */
.home-main {
  background-color: var(--color-bg);
}

/* ----- 首屏三栏区 ----- */
.hero {
  padding: 32px 0 16px;
}

.hero-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 300px 1fr 280px;
  gap: 24px;
  align-items: start;
}

/* 版块矩阵 */
.board-matrix {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.board-matrix h1 {
  font-size: 22px;
  margin-bottom: 6px;
}

.board-matrix .module-desc {
  margin-bottom: 16px;
}

.board-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.board-card {
  display: block;
  padding: 14px 16px;
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base), box-shadow var(--transition-base),
    transform var(--transition-base);
}

.board-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.board-card h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

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

.board-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
}

.board-card:hover .board-link {
  text-decoration: underline;
}

/* 热帖预览 */
.hot-preview {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.hot-preview h2 {
  margin-bottom: 6px;
}

.hot-preview .module-desc {
  margin-bottom: 16px;
}

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

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

.hot-item:first-child {
  padding-top: 0;
}

.hot-item .topic-tag {
  margin-bottom: 6px;
}

.hot-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

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

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

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

/* 规则与公告侧栏 */
.rule-announce {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.rule-card h2 {
  font-size: 17px;
  margin-bottom: 12px;
}

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

.rule-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}

.rule-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

.announce-list {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.announce-list h2 {
  font-size: 17px;
  margin-bottom: 12px;
}

.announce-list ul li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding: 4px 0;
  border-bottom: 1px solid var(--color-border-light);
}

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

/* ----- 新手指南横幅 ----- */
.guide-banner {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 20px;
}

.guide-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background-color: var(--color-primary-light);
  border: 1px solid #dbeafe;
  border-radius: var(--radius-lg);
  padding: 24px 32px;
}

.guide-text h2 {
  font-size: 18px;
  margin-bottom: 4px;
}

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

.guide-btn {
  flex-shrink: 0;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

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

/* ----- 完整热帖列表 ----- */
.hot-topics {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 0;
}

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

.topic-item {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

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

.topic-item .topic-tag {
  margin-bottom: 6px;
}

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

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

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

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

/* ----- 帮助与反馈入口 ----- */
.help-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 8px;
}

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

.faq-entry,
.feedback-flow {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.faq-entry h2,
.feedback-flow h2 {
  font-size: 18px;
  margin-bottom: 6px;
}

.faq-entry .module-desc,
.feedback-flow .module-desc {
  margin-bottom: 16px;
}

.faq-entry ul li {
  margin-bottom: 10px;
}

.faq-entry ul li a {
  font-size: 15px;
  color: var(--color-text);
  display: inline-block;
  padding: 4px 0;
}

.faq-entry ul li a:hover {
  color: var(--color-primary);
}

.feedback-flow .flow-steps li {
  margin-bottom: 12px;
}

/* ============================================================
   board.html —— 版块广场
   ============================================================ */
.page-header {
  padding: 8px 0 20px;
}

.page-header .page-title {
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 780px;
}

/* 分组标签 */
.group-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.group-tabs a {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg-gray);
  border-radius: 999px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.group-tabs a:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* 版块分组 */
.board-group {
  margin-bottom: 40px;
  scroll-margin-top: 80px;
}

.board-group h2 {
  font-size: 20px;
  margin-bottom: 4px;
}

.board-group > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

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

.board-card-grid .board-card {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base),
    transform var(--transition-base);
}

.board-card-grid .board-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.board-card-grid .board-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.board-card-grid .board-card .board-audience {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin-bottom: 12px;
}

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

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

.board-card-grid .board-card a:hover {
  text-decoration: underline;
}

/* ============================================================
   hot.html —— 热门话题
   ============================================================ */
.page-header-wrap {
  margin-bottom: 8px;
}

.topic-filter {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.filter-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 4px;
}

.topic-filter a {
  display: inline-block;
  padding: 5px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-gray);
  border-radius: 999px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.topic-filter a:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* 热帖列表 */
.hot-list {
  margin-bottom: 40px;
}

.hot-post {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.hot-post:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.post-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
}

.post-rank {
  font-size: 12px;
  color: var(--color-text-light);
  font-weight: 500;
}

.hot-post h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

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

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

.hot-post > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.post-footer {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-light);
}

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

.post-replies::before {
  content: '';
  width: 14px;
  height: 14px;
  background-color: var(--color-bg-gray);
  border-radius: 50%;
  display: inline-block;
  border: 2px solid var(--color-border);
}

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

/* 话题分类入口 */
.topic-categories {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

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

.category-card {
  display: block;
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base),
    transform var(--transition-base);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.category-card h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.category-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 相关社区入口 */
.related-entry {
  background-color: var(--color-bg-gray);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-top: 24px;
}

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

.related-entry p a {
  font-weight: 500;
  margin: 0 4px;
}

/* ============================================================
   guide.html —— 新手指南
   ============================================================ */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.layout-shell.sidebar-left {
  grid-template-columns: 220px 1fr;
  align-items: start;
}

/* 步骤目录 */
.step-nav {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.step-nav h2 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.step-nav ul li {
  margin-bottom: 4px;
}

.step-nav ul li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

/* 指南正文 */
.guide-content {
  min-width: 0;
}

.guide-step {
  margin-bottom: 40px;
  scroll-margin-top: 80px;
}

.guide-step h2 {
  font-size: 20px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.guide-step p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 12px;
}

.guide-step h3 {
  font-size: 16px;
  margin: 20px 0 8px;
}

.guide-step h3 + p {
  margin-bottom: 8px;
}

.guide-step a {
  font-weight: 500;
}

.guide-figure {
  margin: 20px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg-gray);
}

.guide-figure img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-gray-light);
  border-top: 1px solid var(--color-border-light);
}

/* 相关链接 */
.related-links {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.related-links h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

.related-links ul li {
  margin-bottom: 8px;
}

.related-links ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.related-links ul li a:hover {
  color: var(--color-primary);
}

/* ============================================================
   rules.html —— 社区规则
   ============================================================ */
.rules-content {
  min-width: 0;
}

.rule-section {
  margin-bottom: 40px;
  scroll-margin-top: 80px;
}

.rule-section h2 {
  font-size: 20px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

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

.rule-list {
  margin-bottom: 16px;
}

.rule-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 8px;
}

.rule-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

.rule-list li strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 4px;
}

.rule-figure {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg-gray);
}

.rule-figure img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
}

.rule-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-gray-light);
  border-top: 1px solid var(--color-border-light);
}

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

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

.rule-related p a {
  font-weight: 500;
  margin: 0 4px;
}

/* ============================================================
   help.html —— 帮助与反馈
   ============================================================ */
.question-nav {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.question-nav h2 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.question-nav ul li {
  margin-bottom: 4px;
}

.question-nav ul li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

.side-figure {
  margin-top: 20px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg);
}

.side-figure img {
  width: 100%;
  max-height: 160px;
  object-fit: cover;
}

.side-figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-gray-light);
  border-top: 1px solid var(--color-border-light);
}

/* 帮助正文 */
.content {
  min-width: 0;
}

.faq-category {
  margin-bottom: 40px;
  scroll-margin-top: 80px;
}

.faq-category h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

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

.faq-item summary {
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  padding-right: 44px;
  list-style: none;
  transition: background-color var(--transition-base);
}

.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-text-secondary);
  transition: transform var(--transition-base);
}

.faq-item[open] summary {
  background-color: var(--color-bg-gray-light);
  color: var(--color-primary);
}

.faq-item[open] summary::after {
  content: '−';
  transform: translateY(-50%);
}

.faq-item summary:hover {
  background-color: var(--color-bg-gray-light);
}

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

.faq-item p a {
  font-weight: 500;
}

/* 反馈流程 */
.feedback-flow {
  background-color: var(--color-bg-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 32px;
}

.feedback-flow h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

.feedback-flow > p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.feedback-flow .flow-steps li {
  margin-bottom: 12px;
}

.feedback-flow > p:last-child {
  margin-top: 16px;
  margin-bottom: 0;
}

/* ============================================================
   404.html —— 错误页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 300px);
  padding: 40px 20px;
}

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

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 12px;
}

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

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

.error-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

.error-help a {
  font-weight: 500;
}

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

/* ----- 桌面端 1024–1440 ----- */
@media (min-width: 1025px) {
  .brand-tag {
    display: inline;
  }
}

/* ----- 平板端 768–1024 ----- */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 260px 1fr;
  }

  .rule-announce {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

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

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

  .layout-shell.sidebar-left {
    grid-template-columns: 200px 1fr;
  }
}

/* ----- 手机端 767px 以下 ----- */
@media (max-width: 767px) {
  .header-inner {
    padding: 0 16px;
    height: 56px;
    gap: 8px;
  }

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

  .brand-tag {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 0;
    margin: 0;
    z-index: 99;
  }

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

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

  .nav-list li a {
    padding: 12px 8px;
    font-size: 16px;
    border-radius: var(--radius-md);
  }

  .header-help {
    display: none;
  }

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

  .breadcrumb {
    padding: 4px 0 16px;
  }

  h1 {
    font-size: 22px;
  }

  h2 {
    font-size: 19px;
  }

  /* 首页 */
  .hero {
    padding: 20px 0 8px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 16px;
  }

  .board-matrix {
    padding: 16px;
  }

  .board-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .board-card {
    padding: 12px;
  }

  .board-card h3 {
    font-size: 14px;
  }

  .board-card p {
    font-size: 12px;
  }

  .hot-preview {
    padding: 16px;
  }

  .rule-announce {
    grid-column: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .rule-card,
  .announce-list {
    padding: 16px;
  }

  .guide-banner {
    padding: 0 16px;
    margin-top: 24px;
  }

  .guide-banner-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    gap: 16px;
  }

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

  .hot-topics {
    padding: 24px 16px 0;
  }

  .hot-topics-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .help-entry {
    padding: 24px 16px 0;
  }

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

  .faq-entry,
  .feedback-flow {
    padding: 16px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .footer-bottom {
    padding: 16px 0;
  }

  /* 版块页 */
  .group-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 12px 0 16px;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .group-tabs a {
    flex-shrink: 0;
    padding: 6px 14px;
    font-size: 13px;
  }

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

  .board-group {
    margin-bottom: 28px;
  }

  /* 热门话题页 */
  .topic-filter {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 12px 0 16px;
    gap: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .filter-label {
    flex-shrink: 0;
  }

  .topic-filter a {
    flex-shrink: 0;
    padding: 5px 14px;
    font-size: 13px;
  }

  .hot-post {
    padding: 16px;
  }

  .hot-post h3 {
    font-size: 16px;
  }

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

  .related-entry {
    padding: 16px;
  }

  /* 指南与帮助页 */
  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .step-nav,
  .question-nav {
    position: static;
    margin-bottom: 20px;
    padding: 16px;
  }

  .step-nav h2,
  .question-nav h2 {
    margin-bottom: 8px;
  }

  .step-nav ul,
  .question-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .step-nav ul li,
  .question-nav ul li {
    margin: 0;
  }

  .step-nav ul li a,
  .question-nav ul li a {
    padding: 6px 12px;
    font-size: 13px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 999px;
  }

  .step-nav ul li a:hover,
  .question-nav ul li a:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
  }

  .side-figure {
    display: none;
  }

  .guide-step {
    margin-bottom: 28px;
  }

  .guide-step h2 {
    font-size: 18px;
  }

  .faq-category {
    margin-bottom: 28px;
  }

  .faq-category h2 {
    font-size: 18px;
  }

  .faq-item summary {
    padding: 12px 40px 12px 16px;
    font-size: 14px;
  }

  .faq-item p {
    padding: 0 16px 12px;
    font-size: 14px;
  }

  .feedback-flow {
    padding: 16px;
    margin-top: 24px;
  }

  /* 规则页 */
  .rule-section {
    margin-bottom: 28px;
  }

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

  .rule-list li {
    font-size: 14px;
    padding-left: 18px;
  }

  .rule-related {
    padding: 16px;
  }

  /* 404 */
  .error-main {
    min-height: 60vh;
    padding: 24px 16px;
  }

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

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

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

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

/* ----- 极小屏 390px 以下 ----- */
@media (max-width: 390px) {
  .header-inner {
    padding: 0 12px;
  }

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

  .hero-layout,
  .guide-banner,
  .hot-topics,
  .help-entry {
    padding-left: 12px;
    padding-right: 12px;
  }

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

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

  .footer-col h2 {
    margin-bottom: 8px;
  }
}