/* ==========================================================================
   可乐影视 - 全站样式表
   版本：1.0
   说明：本样式表服务于 nyltpc.com 整站，覆盖首页、内页、404 页。
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 全局基础
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #FF6B35;
  --color-primary-dark: #E85A2A;
  --color-primary-light: #FFF1EB;
  --color-ink: #1B2A41;
  --color-ink-soft: #33445C;
  --color-bg: #F4F6FA;
  --color-bg-white: #FFFFFF;
  --color-bg-soft: #F8FAFC;
  --color-accent-yellow: #FFD166;
  --color-accent-teal: #20A39E;
  --color-border: #E2E8F0;
  --color-text: #2D3A4A;
  --color-text-light: #5B6B7C;
  --color-text-muted: #8494A5;

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

  --header-height: 68px;
  --container-width: 1200px;
  --content-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(27, 42, 65, 0.06);
  --shadow-md: 0 4px 16px rgba(27, 42, 65, 0.08);
  --shadow-hover: 0 8px 24px rgba(27, 42, 65, 0.1);
  --transition-base: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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 {
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

figure {
  margin: 0;
}

/* --------------------------------------------------------------------------
   2. layout — 全站骨架
   -------------------------------------------------------------------------- */

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

.brand-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

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

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

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

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

.nav-list a.is-current {
  color: var(--color-primary);
  font-weight: 700;
  background-color: var(--color-primary-light);
}

/* 移动端导航按钮，桌面隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  font-family: var(--font-sans);
  min-height: 44px;
}

.nav-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle-icon {
  display: block;
  width: 18px;
  height: 14px;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
}

.nav-toggle-icon::before {
  top: 0;
}

.nav-toggle-icon::after {
  bottom: 0;
}

/* 主内容 */
.site-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px 48px;
  min-height: 60vh;
}

/* 首页主内容 */
.home-main {
  padding-top: 0;
}

/* 内页主内容 */
.inner-main {
  padding-top: 24px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

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

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

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

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

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

.page-title {
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 8px;
}

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

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 14px;
}

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

.footer-col a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 16px 24px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom p {
  margin-bottom: 0;
}

/* 内页三栏布局
   .sidebar-left 在布局容器自身时使用 .page-layout.sidebar-left
   在祖先节点时使用 .sidebar-left .page-layout
*/
.page-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

/* 首页三栏布局 */
.home-doc.layout-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 260px;
  gap: 32px;
  margin-top: 32px;
  align-items: start;
}

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

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-base),
    color var(--transition-base), border-color var(--transition-base),
    transform var(--transition-base);
  min-height: 44px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  line-height: 1.4;
}

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

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

.btn-secondary {
  background-color: var(--color-bg-white);
  color: var(--color-ink);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* 区块标题 */
.section-title {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

/* 频道标签 */
.channel-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-base),
    color var(--transition-base), border-color var(--transition-base);
  min-height: 32px;
}

.channel-tag:hover {
  background-color: var(--color-accent-yellow);
  border-color: var(--color-accent-yellow);
  color: var(--color-ink);
}

/* 侧栏模块 */
.doc-sidebar,
.doc-aside {
  min-width: 0;
}

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

.sidebar-title,
.aside-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.channel-list li,
.page-toc li {
  margin-bottom: 6px;
}

.channel-list a,
.page-toc a {
  display: block;
  padding: 6px 8px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.channel-list a:hover,
.page-toc a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* 专题卡片 */
.collection-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-base),
    box-shadow var(--transition-base);
}

.collection-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.collection-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.collection-card h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.collection-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* 步骤条 */
.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

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

.step-item p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

/* 相关入口卡片 */
.related-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base),
    transform var(--transition-base);
}

.related-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.related-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.related-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* 侧栏卡片（guide 页） */
.aside-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
}

.aside-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.aside-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* FAQ 手风琴 */
.faq-item {
  background-color: var(--color-bg-white);
  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: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: color var(--transition-base);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item summary:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
}

/* 内页侧栏 */
.page-sidebar,
.page-aside,
.side-nav,
.side-related,
.sidebar-catalog,
.sidebar-related {
  min-width: 0;
}

.sidebar-inner,
.aside-inner {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.sidebar-inner h2,
.aside-inner h2,
.side-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-nav li,
.sidebar-anchor-list li,
.sidebar-list li,
.side-list li,
.aside-links li {
  margin-bottom: 4px;
}

.sidebar-nav a,
.sidebar-anchor-list a,
.sidebar-list a,
.side-list a,
.aside-links a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.sidebar-nav a:hover,
.sidebar-anchor-list a:hover,
.sidebar-list a:hover,
.side-list a:hover,
.aside-links a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.text-link::after {
  content: "→";
  margin-left: 4px;
  transition: transform var(--transition-base);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   4. pages — 页面专属
   -------------------------------------------------------------------------- */

/* ---------- 首页 ---------- */
.home-hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 48px 0 8px;
}

.hero-text {
  max-width: 560px;
}

.hero-text .page-title {
  font-size: 34px;
  margin-bottom: 12px;
}

.title-accent {
  color: var(--color-primary);
}

.hero-lead {
  font-size: 17px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.8;
}

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

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

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.site-intro .section-title {
  margin-bottom: 12px;
}

.site-intro p {
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.focus-entries {
  margin-top: 24px;
}

.focus-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 12px;
}

.focus-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.focus-item p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.focus-item a {
  font-size: 14px;
  font-weight: 600;
}

/* 频道快速标签区 */
.channel-tags {
  margin-top: 48px;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 热门专题预览 */
.hot-collections {
  margin-top: 40px;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.collection-grid .collection-card {
  padding: 0;
}

.collection-grid .collection-card img {
  height: 160px;
}

.collection-grid .collection-card h3,
.collection-grid .collection-card p {
  padding: 0 16px;
}

.collection-grid .collection-card h3 {
  padding-top: 16px;
}

.collection-grid .collection-card a {
  display: block;
  padding: 0 16px 16px;
  font-size: 14px;
  font-weight: 600;
}

/* 观看指南步骤 */
.guide-steps {
  margin-top: 48px;
  padding: 40px 0;
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding-left: 24px;
  padding-right: 24px;
}

.guide-steps .section-title {
  margin-bottom: 20px;
}

/* 支持反馈入口条 */
.support-entry {
  margin-top: 40px;
  padding: 32px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.support-entry .section-title {
  margin-bottom: 8px;
}

.support-entry p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.support-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- 频道总览 ---------- */
.page-content {
  min-width: 0;
}

.channel-block {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: center;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.channel-block:first-of-type {
  padding-top: 0;
}

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

.channel-text h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.channel-text p {
  color: var(--color-text-light);
  font-size: 15px;
  margin-bottom: 10px;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  margin-top: 4px;
}

.channel-link::after {
  content: "→";
  margin-left: 4px;
  transition: transform var(--transition-base);
}

.channel-link:hover::after {
  transform: translateX(3px);
}

.channel-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.channel-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.channel-to-collection {
  margin-top: 32px;
  padding: 24px;
  background-color: var(--color-primary-light);
  border-radius: var(--radius-md);
}

.channel-to-collection h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

.channel-to-collection p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

/* ---------- 专题片单 ---------- */
.collections-list {
  margin-top: 8px;
}

.collections-list > .section-title {
  margin-bottom: 20px;
}

.collection-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  margin-bottom: 24px;
  padding: 20px;
}

.collection-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.collection-media img,
.collection-media figure img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

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

.collection-name {
  font-size: 18px;
  margin-bottom: 4px;
}

.collection-audience {
  display: inline-block;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.collection-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.guide-entry {
  margin-top: 32px;
  padding: 28px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.guide-entry .section-title {
  font-size: 20px;
  margin-bottom: 8px;
}

.guide-entry p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.entry-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 侧栏相关指引 */
.side-related,
.side-nav {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.side-related .related-card {
  border: none;
  border-bottom: 1px solid var(--color-border);
  border-radius: 0;
  padding: 16px 0;
}

.side-related .related-card:last-child {
  border-bottom: none;
}

/* ---------- 观看指南 ---------- */
.page-main-col {
  min-width: 0;
}

.guide-intro {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 32px;
}

.guide-intro p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

.guide-step {
  margin-bottom: 40px;
  padding: 28px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 17px;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-head h2 {
  font-size: 20px;
  margin-bottom: 0;
}

.guide-step p {
  color: var(--color-text-light);
  font-size: 15px;
  margin-bottom: 10px;
}

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

.guide-media {
  margin-top: 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.guide-media figcaption {
  background-color: var(--color-bg-white);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- 常见问题 ---------- */
.faq-content {
  min-width: 0;
}

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

.content-title {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-primary);
}

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

.faq-media {
  margin-top: 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.faq-media figcaption {
  background-color: var(--color-bg-white);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* FAQ 侧栏 */
.sidebar-catalog,
.sidebar-related {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.sidebar-related {
  margin-top: 20px;
}

.related-links a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
}

.related-links a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* ---------- 支持与反馈 ---------- */
.support-overview {
  margin-bottom: 32px;
}

.support-overview h2 {
  font-size: 20px;
  margin-bottom: 10px;
}

.support-overview p {
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.support-figure {
  margin-top: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.support-figure figcaption {
  background-color: var(--color-bg-white);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.support-scenarios {
  margin-top: 32px;
}

.support-scenarios > h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

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

.support-item h3 {
  font-size: 17px;
  margin-bottom: 10px;
  color: var(--color-primary-dark);
}

.support-item p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.support-item strong {
  color: var(--color-ink);
  font-weight: 600;
}

.feedback-process {
  margin-top: 32px;
  padding: 28px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.feedback-process > h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.feedback-process > p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

.process-list li {
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.process-list li h3 {
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}

.process-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.support-return {
  margin-top: 32px;
}

.support-return > h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.support-return > p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.return-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

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

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

.return-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.return-card p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 支持页侧栏 */
.sidebar-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-muted);
}

.sidebar-note p {
  margin-bottom: 6px;
}

.sidebar-note a {
  font-size: 13px;
  font-weight: 600;
}

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

/* ---------- 404 页 ---------- */
.error-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding-top: 48px;
  padding-bottom: 48px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}

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

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

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  min-height: 44px;
}

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

.error-links {
  margin-top: 48px;
  max-width: 480px;
  width: 100%;
}

.error-subtitle {
  font-size: 18px;
  margin-bottom: 16px;
}

.error-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.error-list a {
  font-size: 15px;
  font-weight: 500;
}

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

/* --------------------------------------------------------------------------
   5. responsive — 响应式
   -------------------------------------------------------------------------- */

/* 平板 */
@media (max-width: 1024px) {
  .home-doc.layout-shell {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .home-doc .doc-aside {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .home-doc .aside-module {
    margin-bottom: 0;
  }

  .channel-block {
    grid-template-columns: 1fr 220px;
    gap: 20px;
  }

  .collection-card {
    grid-template-columns: 160px 1fr;
    gap: 16px;
  }

  .collection-media img,
  .collection-media figure img {
    height: 120px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .brand-logo {
    font-size: 19px;
  }

  /* 导航按钮显示 */
  .nav-toggle {
    display: inline-flex;
  }

  /* 导航列表默认收起 */
  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
    z-index: 99;
  }

  /* 展开状态 */
  .nav-list.is-open {
    display: flex;
  }

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

  .nav-list a {
    padding: 12px 20px;
    font-size: 15px;
    border-radius: 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .site-nav {
    position: static;
  }

  .site-main {
    padding: 0 16px 32px;
  }

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

  /* 首页 hero */
  .home-hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 8px;
  }

  .hero-text .page-title,
  .page-title {
    font-size: 26px;
  }

  .hero-lead {
    font-size: 16px;
  }

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

  /* 首页三栏 → 单列 */
  .home-doc.layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 24px;
  }

  /* 移动端顺序：频道快速标签 → 定位与焦点 → 专题预览 → 指南步骤 → 支持入口 → 频道目录 → 服务入口 */
  .home-doc {
    display: flex;
    flex-direction: column;
  }

  .home-doc .doc-main {
    order: 2;
  }

  .home-doc .doc-sidebar {
    order: 6;
  }

  .home-doc .doc-aside {
    order: 7;
    display: block;
  }

  .home-doc .aside-module {
    margin-bottom: 16px;
  }

  /* 频道标签 */
  .channel-tags {
    margin-top: 24px;
    padding: 24px 0;
  }

  .tag-group {
    gap: 8px;
  }

  .channel-tag {
    padding: 6px 12px;
    font-size: 13px;
  }

  /* 专题预览 */
  .collection-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .collection-grid .collection-card img {
    height: 180px;
  }

  /* 步骤条 */
  .steps-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-steps {
    padding: 24px 16px;
    margin-top: 32px;
  }

  /* 支持入口 */
  .support-entry {
    padding: 24px 16px;
    margin-top: 32px;
  }

  .support-actions {
    flex-direction: column;
    gap: 12px;
  }

  .support-actions .btn-primary,
  .support-actions .btn-secondary {
    width: 100%;
  }

  /* 内页三栏 → 单列 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 移动端顺序调整 */
  .page-layout .page-content,
  .page-layout .page-main-col {
    order: 1;
  }

  .page-layout .page-sidebar,
  .page-layout .side-nav,
  .page-layout .sidebar-catalog {
    order: 2;
  }

  .page-layout .page-aside,
  .page-layout .side-related,
  .page-layout .sidebar-related {
    order: 3;
  }

  /* 侧栏不再 sticky */
  .sidebar-inner,
  .aside-inner,
  .side-nav,
  .side-related,
  .sidebar-catalog,
  .sidebar-related {
    position: static;
  }

  /* 频道总览 */
  .channel-block {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px 0;
  }

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

  /* 专题片单 */
  .collection-card {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }

  .collection-media img,
  .collection-media figure img {
    height: 160px;
  }

  .guide-entry {
    padding: 20px 16px;
  }

  .entry-actions {
    flex-direction: column;
  }

  .entry-actions .btn-primary,
  .entry-actions .btn-secondary {
    width: 100%;
  }

  /* 观看指南 */
  .guide-step {
    padding: 20px 16px;
  }

  .step-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .guide-media img {
    height: 180px;
  }

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

  .faq-answer {
    padding: 0 16px 14px;
    font-size: 14px;
  }

  .faq-media img {
    height: 180px;
  }

  /* 支持 */
  .process-list {
    grid-template-columns: 1fr;
  }

  .return-links {
    grid-template-columns: 1fr;
  }

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

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

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

  /* 404 */
  .error-code {
    font-size: 56px;
  }

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

  .error-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

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

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

  .nav-toggle-text {
    font-size: 13px;
  }

  .site-main {
    padding: 0 12px 24px;
  }

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

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

  .collection-grid .collection-card img {
    height: 160px;
  }

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

  .collection-media img,
  .collection-media figure img {
    height: 140px;
  }

  .guide-media img,
  .faq-media img,
  .support-figure img {
    height: 160px;
  }

  .footer-inner {
    gap: 20px;
  }
}

/* 动效增强：尊重减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}