/* ============================================================
   51漫画 · 整站样式表
   配色：浅米白底 / 深墨文字 / 低饱和暖红点缀
   字体：系统无衬线栈，正文15px/1.7
   ============================================================ */

/* ------------------------------------------------------------
   1. Base —— 重置、全局变量、基础排版
   ------------------------------------------------------------ */
:root {
  --color-bg: #F7F6F3;
  --color-text: #2A2E33;
  --color-heading: #1F2329;
  --color-accent: #B85C4C;
  --color-accent-dark: #9E4B3D;
  --color-border: #E5E2DC;
  --color-card: #FFFFFF;
  --color-muted: #6B7280;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 3px rgba(31, 35, 41, 0.06);
  --shadow-hover: 0 4px 12px rgba(31, 35, 41, 0.1);
  --sidebar-width: 240px;
  --content-max: 960px;
  --header-height: 56px;
}

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 600;
}

h1 {
  font-size: 26px;
}

h2 {
  font-size: 20px;
}

h3 {
  font-size: 17px;
}

p {
  margin-bottom: 0.5em;
}

/* 滚动出现动画（仅作增强，不隐藏初始内容） */
.reveal {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* ------------------------------------------------------------
   2. Layout —— 整站骨架、侧栏 + 主内容两栏结构
   ------------------------------------------------------------ */

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

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.5px;
}

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

.brand-name {
  font-size: inherit;
}

/* 导航按钮（移动端汉堡） */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-heading);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* 桌面导航 */
.site-nav {
  display: block;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 44px;
  line-height: 28px;
}

.nav-list li a:hover {
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.06);
}

.nav-list li a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(184, 92, 76, 0.08);
}

/* 两栏布局容器 */
.layout-shell {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

/* 侧栏在左（DOM 顺序：aside 在前、main 在后） */
.sidebar-left {
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

/* 侧栏 */
.sidebar-nav,
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  padding-top: 8px;
}

.sidebar-nav ul,
.sidebar ul,
.sidebar-menu,
.sidebar-nav-list,
.side-nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-nav li a,
.sidebar li a,
.sidebar-menu li a,
.sidebar-nav-list li a,
.side-nav-list li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  min-height: 44px;
  line-height: 24px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.sidebar-nav li a:hover,
.sidebar li a:hover,
.sidebar-menu li a:hover,
.sidebar-nav-list li a:hover,
.side-nav-list li a:hover {
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.05);
  border-left-color: var(--color-accent);
}

.sidebar-nav li a.is-current,
.sidebar li a.is-current,
.sidebar-menu li a.is-current,
.sidebar-nav-list li a.is-current,
.side-nav-list li a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(184, 92, 76, 0.06);
  border-left-color: var(--color-accent);
}

/* 主内容区 */
.site-main {
  flex: 1;
  width: 100%;
}

.inner-main {
  min-width: 0;
  max-width: var(--content-max);
  padding: 32px 0 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

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

.breadcrumb-sep {
  color: #C0BDB6;
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 8px;
  line-height: 1.3;
}

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 640px;
  line-height: 1.7;
}

/* 区块标题 */
.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

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

.section-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}

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

.footer-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 4px;
}

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

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  min-height: 44px;
  line-height: 1.4;
  text-align: center;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: #FFFFFF;
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background-color: rgba(184, 92, 76, 0.08);
  color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* 标签 */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.08);
  border-radius: 999px;
  line-height: 1.5;
}

/* 图片容器 */
.topic-cover,
.topic-cover img,
.category-cover,
.category-cover img,
.hot-topic-item img,
.rank-cover,
.rank-cover img,
.update-cover,
.update-cover img,
.new-cover,
.new-cover img,
.hero-media img,
.guide-figure img,
.faq-figure img,
.about-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 图容器宽高约束 */
.topic-cover,
.category-cover,
.hot-topic-item img,
.rank-cover,
.update-cover,
.new-cover {
  overflow: hidden;
  background-color: #EFEDE8;
  border-radius: var(--radius-md);
}

/* 卡片通用 hover */
.category-card,
.hot-topic-item,
.rank-item,
.update-item,
.new-card,
.rank-preview,
.update-preview,
.guide-card,
.faq-card,
.topic-card,
.related-card {
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.category-card:hover,
.hot-topic-item:hover,
.rank-item:hover,
.update-item:hover,
.new-card:hover,
.rank-preview:hover,
.update-preview:hover,
.guide-card:hover,
.faq-card:hover,
.topic-card:hover,
.related-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

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

.home-main {
  flex: 1;
}

/* 首屏 hero */
.hero-section {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  background-color: #F0EEE8;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  color: var(--color-heading);
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-heading);
}

.hero-slogan {
  font-size: 20px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.hero-intro {
  font-size: 16px;
  max-width: 480px;
  margin-bottom: 24px;
  color: var(--color-text);
}

.scroll-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-heading);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
  opacity: 0.6;
  z-index: 1;
}

.scroll-hint::after {
  content: "";
  width: 4px;
  height: 8px;
  background-color: var(--color-heading);
  border-radius: 2px;
  animation: scroll-hint-move 1.6s ease-in-out infinite;
}

@keyframes scroll-hint-move {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(12px); opacity: 0; }
}

/* 首页通用区块 */
.section-block {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* 本期专题 */
.topic-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  align-items: center;
}

.topic-cover {
  aspect-ratio: 4 / 3;
}

.topic-info h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.topic-desc {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.7;
}

/* 任务分组：榜单 + 更新 */
.task-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.rank-preview,
.update-preview {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.rank-preview h3,
.update-preview h3 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.rank-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.rank-list li:hover {
  background-color: #F9F8F5;
}

.rank-num {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.1);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.rank-list li img {
  width: 44px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.rank-item-info {
  min-width: 0;
}

.rank-item-info h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rank-item-info .tag {
  font-size: 11px;
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.update-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.update-list li:hover {
  background-color: #F9F8F5;
}

.update-list li img {
  width: 44px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.update-item-info {
  min-width: 0;
}

.update-item-info h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.update-item-info .meta {
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 2px;
}

/* 题材标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.tag-item {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  min-height: 44px;
  line-height: 24px;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.tag-item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.04);
}

.tag-more {
  margin-top: 12px;
}

/* 了解更多卡片 */
.learn-more {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

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

.guide-card h3,
.faq-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.guide-card p,
.faq-card p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-heading);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 44px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

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

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

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

/* 相关链接 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-heading);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-accent);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background-color: rgba(184, 92, 76, 0.06);
  min-height: 44px;
  line-height: 28px;
}

.related-links-item:hover {
  background-color: rgba(184, 92, 76, 0.12);
}

/* ------------------------------------------------------------
   5. Pages —— 题材分类页
   ------------------------------------------------------------ */

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

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

.category-cover {
  aspect-ratio: 3 / 2;
}

.category-info {
  padding: 16px;
}

.category-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.category-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

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

/* 热门题材推荐 */
.hot-topic-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

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

.topic-rank {
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

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

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

.topic-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

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

.more-link-wrap {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

/* ------------------------------------------------------------
   6. Pages —— 最近更新页
   ------------------------------------------------------------ */

.update-timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 48px;
}

.update-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  align-items: start;
}

.update-cover {
  aspect-ratio: 3 / 4;
}

.update-info {
  min-width: 0;
  padding-top: 4px;
}

.update-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.update-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.update-brief {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

/* 近期上新 */
.new-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.new-cover {
  aspect-ratio: 3 / 4;
}

.new-info {
  padding: 16px;
}

.new-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.new-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.new-date {
  font-size: 12px;
  color: var(--color-muted);
}

/* 相关链接列表 */
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-list li a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.06);
  border-radius: var(--radius-sm);
  min-height: 44px;
  line-height: 28px;
}

.related-list li a:hover {
  background-color: rgba(184, 92, 76, 0.12);
}

/* ------------------------------------------------------------
   7. Pages —— 排行榜页
   ------------------------------------------------------------ */

.rank-section {
  margin-bottom: 48px;
}

.section-head {
  margin-bottom: 20px;
}

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

.rank-item {
  display: grid;
  grid-template-columns: 36px 72px 1fr;
  gap: 16px;
  align-items: center;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.rank-number {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.1);
  border-radius: var(--radius-sm);
}

.rank-cover {
  width: 72px;
  height: 96px;
  border-radius: var(--radius-sm);
}

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

.rank-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.rank-info .tag-topic {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background-color: rgba(184, 92, 76, 0.08);
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 6px;
}

.rank-info p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 榜单说明 */
.rank-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.rank-note h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

.rank-note p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.rank-note p a {
  color: var(--color-accent);
  margin-right: 12px;
  display: inline-block;
  min-height: 44px;
  line-height: 44px;
}

/* ------------------------------------------------------------
   8. Pages —— 阅读指南页
   ------------------------------------------------------------ */

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

.guide-heading {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.guide-lead {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

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

.guide-steps li h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-heading);
}

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

.guide-steps li p a {
  color: var(--color-accent);
  font-weight: 500;
  border-bottom: 1px solid rgba(184, 92, 76, 0.3);
}

.guide-steps li p a:hover {
  border-bottom-color: var(--color-accent);
}

.guide-figure {
  margin: 24px 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
}

/* 更多帮助卡片 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
}

.related-card-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 6px;
}

.related-card-desc {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

.related-card:hover .related-card-title {
  color: var(--color-accent);
}

/* ------------------------------------------------------------
   9. Pages —— 常见问题页
   ------------------------------------------------------------ */

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

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

.faq-figure {
  margin-top: 32px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.faq-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
}

/* ------------------------------------------------------------
   10. Pages —— 关于本站页
   ------------------------------------------------------------ */

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

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

.about-content p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-content p:last-child {
  margin-bottom: 0;
}

.about-figure {
  margin-top: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.about-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.about-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
  background-color: #FAF9F6;
}

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.principle-list li {
  padding-left: 20px;
  position: relative;
  font-size: 15px;
  line-height: 1.7;
}

.principle-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.about-links {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.about-links p a {
  display: inline-block;
  margin-right: 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  min-height: 44px;
  line-height: 44px;
}

/* ------------------------------------------------------------
   11. Pages —— 404 页
   ------------------------------------------------------------ */

.error-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
}

.error-panel {
  max-width: 480px;
  text-align: center;
  background-color: var(--color-card);
  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-accent);
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.error-suggest {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

/* 桌面端：隐藏汉堡按钮，显示导航 */
@media (min-width: 1025px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
  }
}

/* 平板及以下：双栏切单栏，抽屉导航 */
@media (max-width: 1024px) {
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 16px;
  }

  .sidebar-nav,
  .sidebar {
    position: static;
    display: none;
  }

  .inner-main {
    padding: 24px 0 48px;
  }

  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .new-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

/* 手机端 */
@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  /* 汉堡按钮 */
  .nav-toggle {
    display: flex;
  }

  /* 导航列表默认收起，is-open 展开 */
  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(31, 35, 41, 0.08);
  }

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

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

  .nav-list li a {
    padding: 12px 8px;
    font-size: 15px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

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

  /* 汉堡动画 */
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* 首页 hero */
  .hero-section {
    min-height: 320px;
  }

  .hero-content {
    padding: 48px 16px;
  }

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

  .hero-slogan {
    font-size: 17px;
  }

  .hero-intro {
    font-size: 15px;
  }

  .section-block {
    padding: 32px 16px;
  }

  .topic-card {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }

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

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

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

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

  .update-item {
    grid-template-columns: 80px 1fr;
    gap: 12px;
    padding: 12px;
  }

  .new-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .rank-item {
    grid-template-columns: 28px 56px 1fr;
    gap: 10px;
    padding: 10px 12px;
  }

  .rank-cover {
    width: 56px;
    height: 76px;
  }

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

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

  .footer-bottom {
    padding: 12px 16px;
  }

  .guide-steps li {
    padding: 16px;
  }

  .about-content {
    padding: 16px;
  }

  .error-panel {
    padding: 32px 24px;
  }

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

  .related-links {
    padding: 16px;
    gap: 8px;
  }

  /* 面包屑 */
  .breadcrumb {
    margin-bottom: 16px;
    font-size: 12px;
  }

  .page-header {
    margin-bottom: 24px;
  }

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

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

/* 小屏手机 */
@media (max-width: 390px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

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

  .topic-card {
    padding: 12px;
  }

  .rank-item {
    grid-template-columns: 24px 48px 1fr;
    gap: 8px;
    padding: 8px 10px;
  }

  .rank-cover {
    width: 48px;
    height: 64px;
  }

  .update-item {
    grid-template-columns: 64px 1fr;
    gap: 10px;
    padding: 10px;
  }

  .update-cover {
    aspect-ratio: 3 / 4;
  }
}

/* 程序验收反馈定向修复 */
@media (min-width: 769px) and (max-width: 1100px) {
  .new-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}