/* ==========================================================================
   糖心vlog 内容导航站 - 整站样式表
   版本: 1.0
   说明: 覆盖首页、内页、404 页全部 DOM 结构
   ========================================================================== */

/* ==========================================================================
   01. Base - 基础变量、重置、全局字体与颜色
   ========================================================================== */

:root {
  --color-primary: #FF6B4A;
  --color-primary-hover: #E85A3C;
  --color-secondary: #1BA0A6;
  --color-secondary-hover: #178A8F;
  --color-bg: #FFF9F5;
  --color-text: #26221F;
  --color-text-muted: #6B625C;
  --color-border: #F1E8E2;
  --color-white: #FFFFFF;
  --color-card-bg: #FFFFFF;
  --color-tag-bg: #F1E8E2;
  --color-tag-text: #4A443F;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;

  --container-width: 1200px;
  --content-max-width: 1200px;
  --sidebar-width: 240px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --gap-sm: 12px;
  --gap-md: 20px;
  --gap-lg: 32px;
  --gap-xl: 48px;

  --shadow-card: 0 2px 8px rgba(38, 34, 31, 0.06);
  --shadow-card-hover: 0 6px 20px rgba(38, 34, 31, 0.1);
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

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

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

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

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: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

/* ==========================================================================
   02. Layout - 全站骨架：页头、页脚、主容器
   ========================================================================== */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  color: var(--color-text);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

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

.brand-name {
  white-space: nowrap;
}

/* --- 导航 --- */
.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.nav-list li a.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background-color: rgba(255, 107, 74, 0.08);
}

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

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-brand-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.footer-brand p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

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

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

.copyright {
  width: 100%;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 8px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* --- 主容器 --- */
.site-main {
  flex: 1;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- 内页骨架 --- */
.inner-main {
  padding-top: 32px;
  padding-bottom: 64px;
}

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

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

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

.breadcrumb-sep {
  color: var(--color-text-muted);
  opacity: 0.6;
}

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

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

.page-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 720px;
  line-height: 1.7;
}

/* --- 两栏布局 --- */
.page-layout,
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-layout.sidebar-left,
.layout-shell.sidebar-left {
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

.page-layout.sidebar-left > .sidebar,
.layout-shell.sidebar-left > .sidebar {
  grid-column: 1;
  grid-row: 1;
}

.page-layout.sidebar-left > .content,
.page-layout.sidebar-left > .content-area,
.layout-shell.sidebar-left > .content,
.layout-shell.sidebar-left > .content-area {
  grid-column: 2;
  grid-row: 1;
}

/* ==========================================================================
   03. Components - 通用组件
   ========================================================================== */

/* --- 文本链接 --- */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform 0.2s ease;
}

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

.text-link:hover::after {
  transform: translateX(4px);
}

/* --- 按钮 --- */
.btn-primary,
.btn-secondary,
.btn-back-home,
.btn-view-guide {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

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

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

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

/* --- 侧栏 --- */
.sidebar {
  min-width: 0;
}

.sidebar-block,
.sidebar-box,
.sidebar-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-list li a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

/* 侧栏导航 */
.sidebar-nav {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-nav .sidebar-title,
.sidebar-nav > p:first-child {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-nav ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.sidebar-nav ul:last-child {
  margin-bottom: 0;
}

.sidebar-nav ul li a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.sidebar-nav h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-note-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

/* --- 区块通用 --- */
.section-block {
  margin-bottom: 40px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

/* --- 图片容器 --- */
figure {
  margin: 0;
}

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

figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  padding: 8px 0 0;
  line-height: 1.5;
}

/* --- 频道标签 --- */
.channel-tag,
.filter-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-secondary);
  background-color: rgba(27, 160, 166, 0.08);
  border: 1px solid rgba(27, 160, 166, 0.25);
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.channel-tag:hover,
.filter-tag:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
  border-color: var(--color-secondary);
}

/* --- 卡片 --- */
.video-card,
.playlist-card,
.channel-item,
.step-card,
.device-item {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover,
.playlist-card:hover,
.channel-item:hover,
.step-card:hover,
.device-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.faq-question::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question {
  background-color: var(--color-bg);
}

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

.faq-answer {
  padding: 0 20px 16px;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   04. Pages - 首页
   ========================================================================== */

.home-main {
  padding-top: 0;
  padding-bottom: 64px;
}

/* --- Hero 专题首屏 --- */
.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 40px;
  align-items: center;
  padding: 48px 0 56px;
}

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

.hero-content h1 {
  font-size: 36px;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-summary {
  font-size: 17px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 560px;
}

.content-directory {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.content-directory a {
  font-size: 14px;
  color: var(--color-text-muted);
}

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

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

/* --- 频道标签区 --- */
.channel-tags-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.channel-tags-section h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.channel-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* --- 编辑焦点区 --- */
.featured-focus-section {
  padding: 40px 0;
}

.featured-focus-section > h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

.featured-focus-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.featured-media {
  min-height: 320px;
}

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

.featured-info {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 12px;
}

.featured-info h3 {
  font-size: 22px;
  font-weight: 600;
}

.featured-info p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- 视频卡片区 --- */
.video-cards-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.video-cards-section h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.video-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.video-card {
  display: flex;
  flex-direction: column;
}

.video-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.video-card h3 {
  font-size: 17px;
  font-weight: 600;
  padding: 16px 16px 4px;
}

.video-tag {
  display: inline-block;
  align-self: flex-start;
  margin: 0 16px 8px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--color-secondary);
  background-color: rgba(27, 160, 166, 0.08);
  border-radius: 999px;
}

.video-card > p:last-child {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: 0 16px 16px;
  margin: 0;
}

/* --- 专题片单入口 --- */
.playlist-entry-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.playlist-entry-section h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.playlist-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.playlist-card {
  display: flex;
  flex-direction: column;
}

.playlist-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.playlist-card h3 {
  font-size: 18px;
  font-weight: 600;
  padding: 16px 16px 4px;
}

.playlist-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: 0 16px;
  margin: 0 0 12px;
}

.playlist-card .text-link {
  margin: auto 16px 16px;
}

/* --- 观看指南区 --- */
.guide-teaser-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.guide-teaser-section h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin: 24px 0;
}

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

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  margin-bottom: 12px;
}

.guide-step-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.guide-step-item p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

.guide-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

.guide-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.guide-link:hover::after {
  transform: translateX(4px);
}

/* --- 问题反馈区 --- */
.feedback-entry-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.feedback-entry-section h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

.feedback-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
}

.faq-links h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

.faq-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-links ul li a {
  display: inline-block;
  font-size: 15px;
  color: var(--color-text-muted);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.feedback-entry h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feedback-entry p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ==========================================================================
   05. Pages - 频道分类页 (fenlei)
   ========================================================================== */

.page-fenlei .content-area {
  min-width: 0;
}

/* 筛选条件区 */
.filter-tags {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.filter-tags .section-title {
  font-size: 18px;
  margin-bottom: 4px;
}

.filter-tags .section-desc {
  font-size: 14px;
  margin-bottom: 16px;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 频道列表 */
.channel-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.channel-list > .section-title {
  font-size: 22px;
  margin-bottom: 4px;
}

.channel-item {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  padding: 20px;
}

.channel-media {
  min-width: 0;
}

.channel-media figure {
  width: 100%;
  height: 180px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.channel-info {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.channel-name {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.channel-summary {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 100%;
}

.channel-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 12px;
}

.channel-features li {
  font-size: 13px;
  color: var(--color-text-muted);
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.channel-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background-color: var(--color-secondary);
  border-radius: 50%;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: auto;
}

.channel-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.channel-link:hover::after {
  transform: translateX(4px);
}

/* 题材标签索引 */
.topic-tags {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 32px;
}

.topic-tags .section-title {
  font-size: 18px;
  margin-bottom: 4px;
}

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 16px;
}

.topic-list li a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--color-secondary);
  background-color: rgba(27, 160, 166, 0.06);
  border: 1px solid rgba(27, 160, 166, 0.2);
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.topic-note {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.topic-note a {
  font-size: 13px;
}

/* ==========================================================================
   06. Pages - 观看指南页 (wang-zhi)
   ========================================================================== */

.page-wang-zhi .content {
  min-width: 0;
}

/* 观看步骤 */
.guide-steps.section-block {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.guide-steps.section-block > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.guide-steps.section-block > .section-desc {
  margin-bottom: 20px;
}

.step-card {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 20px;
  margin-bottom: 12px;
}

.step-card .step-number {
  width: 44px;
  height: 44px;
  font-size: 18px;
}

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

.step-body h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-body p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}

/* 设备支持 */
.device-support.section-block > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.device-support.section-block > .section-desc {
  margin-bottom: 20px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.device-item {
  padding: 20px;
}

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

.device-item p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

.guide-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 8px;
}

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

/* 入口核验清单 */
.checklist-section.section-block > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.checklist-section.section-block > .section-desc {
  margin-bottom: 20px;
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 12px;
  counter-reset: checklist-counter;
}

.checklist li {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px 16px 56px;
  position: relative;
  counter-increment: checklist-counter;
}

.checklist li::before {
  content: counter(checklist-counter);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-secondary);
  border-radius: 50%;
}

.checklist li h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.checklist li p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* 相关链接 */
.related-links.section-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.related-links.section-block h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.related-links.section-block p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.related-links.section-block p a {
  display: inline-block;
  margin-right: 16px;
  font-size: 14px;
}

/* ==========================================================================
   07. Pages - 专题片单页 (pian-dan)
   ========================================================================== */

.page-pian-dan .content-area {
  min-width: 0;
}

/* 主题片单 */
.playlists {
  margin-bottom: 40px;
}

.playlists .section-title {
  font-size: 22px;
  margin-bottom: 4px;
}

.playlists .section-desc {
  margin-bottom: 20px;
}

.playlist-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.playlist-card {
  display: flex;
  flex-direction: column;
}

.playlist-figure {
  width: 100%;
  height: 180px;
  overflow: hidden;
}

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

.playlist-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.playlist-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.playlist-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.playlist-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.playlist-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.playlist-link:hover::after {
  transform: translateX(4px);
}

/* 近期更新 */
.updates .section-title {
  font-size: 22px;
  margin-bottom: 4px;
}

.updates .section-desc {
  margin-bottom: 20px;
}

.update-group {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
}

.update-date {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.update-item {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.5;
  padding: 4px 0;
}

.update-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--color-secondary);
  background-color: rgba(27, 160, 166, 0.08);
  border-radius: 999px;
  flex-shrink: 0;
}

/* 相关链接 */
.related-links {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 32px;
}

.related-links-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.related-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

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

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

/* ==========================================================================
   08. Pages - 常见问题页 (chang-jian-wen-ti)
   ========================================================================== */

.page-chang-jian-wen-ti .content {
  min-width: 0;
}

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

.faq-section .section-title {
  font-size: 22px;
  margin-bottom: 4px;
}

.faq-section .section-intro {
  margin-bottom: 20px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* 问题视觉图 */
.issue-visual {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
}

.issue-visual .section-title {
  font-size: 18px;
  margin-bottom: 16px;
}

.issue-figure {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.issue-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

/* 反馈引导 */
.feedback-guide {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.feedback-guide .section-title {
  font-size: 18px;
  margin-bottom: 4px;
}

.feedback-guide .section-intro {
  font-size: 14px;
  margin-bottom: 16px;
}

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

/* ==========================================================================
   09. Pages - 问题反馈页 (fan-kui)
   ========================================================================== */

.page-fan-kui .content {
  min-width: 0;
}

/* 反馈流程 */
.feedback-process {
  margin-bottom: 40px;
}

.feedback-process > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.feedback-process > .section-intro {
  margin-bottom: 20px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  margin-bottom: 10px;
}

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

.process-step p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

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

.process-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

/* 准备清单 */
.preparation {
  margin-bottom: 40px;
}

.preparation > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.preparation > .section-intro {
  margin-bottom: 20px;
}

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

.check-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.check-list li h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.check-list li p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* 状态说明 */
.status > h2 {
  font-size: 22px;
  margin-bottom: 4px;
}

.status > .section-intro {
  margin-bottom: 20px;
}

.status-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

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

.status-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.status-item p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

.feedback-cta {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.feedback-cta p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin: 0;
  flex: 1;
  min-width: 200px;
}

.feedback-cta a {
  font-size: 14px;
  font-weight: 500;
}

/* ==========================================================================
   10. Pages - 404 页面
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-content {
  max-width: 560px;
  text-align: center;
}

.error-code {
  font-size: 72px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.btn-back-home {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 1px solid var(--color-primary);
}

.btn-back-home:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-white);
}

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

.btn-view-guide:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

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

/* ==========================================================================
   11. Responsive - 响应式断点
   ========================================================================== */

/* --- 平板 1024px --- */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 20px;
  }

  .site-main {
    padding: 0 20px;
  }

  .video-cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .channel-item {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .hero-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .hero-figure img {
    height: 300px;
  }
}

/* --- 移动端 768px --- */
@media (max-width: 768px) {
  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(38, 34, 31, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 2px;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 15px;
  }

  .site-main {
    padding: 0 16px;
  }

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

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

  .page-description {
    font-size: 15px;
  }

  /* 两栏布局切换单栏 */
  .page-layout.sidebar-left,
  .layout-shell.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .page-layout.sidebar-left > .sidebar,
  .layout-shell.sidebar-left > .sidebar {
    grid-column: 1;
    grid-row: auto;
    order: 2;
  }

  .page-layout.sidebar-left > .content,
  .page-layout.sidebar-left > .content-area,
  .layout-shell.sidebar-left > .content,
  .layout-shell.sidebar-left > .content-area {
    grid-column: 1;
    grid-row: auto;
    order: 1;
  }

  /* 首页模块单栏化 */
  .hero-section {
    padding: 32px 0 40px;
  }

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

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

  .featured-focus-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .featured-media {
    min-height: 200px;
  }

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

  .featured-info {
    padding: 24px;
  }

  .video-cards-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .playlist-cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .guide-steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .feedback-links {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 频道分类页 */
  .channel-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-media figure {
    height: 160px;
  }

  /* 观看指南页 */
  .device-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .step-card {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .guide-media img {
    height: 200px;
  }

  /* 专题片单页 */
  .playlist-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .playlist-figure {
    height: 160px;
  }

  /* 反馈页 */
  .process-steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .status-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .process-figure img {
    height: 200px;
  }

  /* 页脚 */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    padding: 24px 16px;
  }

  .footer-nav {
    justify-content: center;
  }
}

/* --- 小屏 480px --- */
@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 24px;
  }

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

  .content-directory {
    gap: 6px 12px;
  }

  .channel-tags-list {
    gap: 8px;
  }

  .channel-tag,
  .filter-tag {
    padding: 6px 14px;
    font-size: 13px;
  }

  .video-card img {
    height: 180px;
  }

  .playlist-card img {
    height: 180px;
  }

  .featured-info {
    padding: 20px;
  }

  .featured-info h3 {
    font-size: 19px;
  }

  .checklist li {
    padding-left: 48px;
  }

  .checklist li::before {
    left: 12px;
    width: 24px;
    height: 24px;
    font-size: 13px;
  }

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

  .error-content h1 {
    font-size: 22px;
  }
}