/* ============================================================
   base — 全局基础样式
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background-color: #FAFAF9;
  color: #1F2937;
  font-size: 15px;
  line-height: 1.7;
  font-weight: 400;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: #E8590C;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #C74A08;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
  color: #1F2937;
}

p {
  margin-bottom: 0;
}

/* ============================================================
   layout — 全站布局骨架
   ============================================================ */
.layout-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.site-header {
  background-color: #FFFFFF;
  border-bottom: 1px solid #F2F2F0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #1F2937;
  letter-spacing: 0.5px;
}

.site-nav {
  display: flex;
  align-items: center;
  flex: 1;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 12px;
  align-items: center;
  gap: 6px;
  color: #1F2937;
}

.nav-toggle-icon {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #1F2937;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: #1F2937;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle-text {
  font-size: 14px;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: #1F2937;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  background-color: #FAFAF9;
  color: #E8590C;
}

.nav-list li a.is-current {
  color: #E8590C;
  font-weight: 500;
  background-color: rgba(232, 89, 12, 0.06);
}

.header-tools {
  flex-shrink: 0;
}

.tool-link {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  color: #6B7280;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.tool-link:hover {
  border-color: #E8590C;
  color: #E8590C;
}

.site-main {
  flex: 1;
}

.site-footer {
  background-color: #FFFFFF;
  border-top: 1px solid #F2F2F0;
  margin-top: 64px;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #1F2937;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: #6B7280;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: #E8590C;
}

.footer-bottom {
  border-top: 1px solid #F2F2F0;
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #6B7280;
}

/* ============================================================
   components — 通用组件
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  color: #FFFFFF;
  background-color: #E8590C;
  border: 1px solid #E8590C;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.btn-primary:hover {
  background-color: #C74A08;
  color: #FFFFFF;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  color: #1F2937;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.btn-secondary:hover {
  border-color: #E8590C;
  color: #E8590C;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: #1F2937;
}

.section-intro {
  font-size: 15px;
  color: #6B7280;
  margin-top: 8px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-head h2 {
  font-size: 24px;
  font-weight: 700;
}

.section-desc {
  font-size: 14px;
  color: #6B7280;
  margin-top: 6px;
}

.section-link {
  font-size: 14px;
  color: #E8590C;
  white-space: nowrap;
}

.section-link:hover {
  color: #C74A08;
}

.tag-label {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  color: #0E7490;
  background-color: rgba(14, 116, 144, 0.08);
  border-radius: 4px;
  white-space: nowrap;
}

/* ============================================================
   components — 页头导航与移动端菜单
   ============================================================ */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    min-height: 56px;
    padding-top: 8px;
    padding-bottom: 8px;
    gap: 8px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border: 1px solid #F2F2F0;
    border-radius: 8px;
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
    z-index: 50;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  }

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

  .nav-list li a {
    padding: 12px 14px;
    font-size: 15px;
  }

  .header-tools {
    margin-left: auto;
  }
}

/* ============================================================
   components — 面包屑与页面标题区
   ============================================================ */
.breadcrumb {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 13px;
  color: #6B7280;
}

.breadcrumb a {
  color: #6B7280;
}

.breadcrumb a:hover {
  color: #E8590C;
}

.breadcrumb-sep {
  margin: 0 8px;
  color: #9CA3AF;
}

.breadcrumb-current {
  color: #1F2937;
}

.page-header {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 24px;
}

.page-header h1.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #1F2937;
  line-height: 1.3;
}

.page-description {
  font-size: 15px;
  color: #6B7280;
  margin-top: 12px;
  max-width: 720px;
}

/* ============================================================
   pages — index 首页
   ============================================================ */
.hero-focus {
  background-color: #FFFFFF;
  border-bottom: 1px solid #F2F2F0;
  padding: 48px 0;
}

.hero-focus .hero-copy {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-focus .hero-copy h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  max-width: 680px;
}

.hero-lead {
  font-size: 16px;
  color: #6B7280;
  margin-top: 16px;
  max-width: 600px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.hero-media {
  max-width: 1080px;
  margin: 32px auto 0;
  padding: 0 24px;
}

.hero-media img {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: 8px;
}

.hero-media figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 8px;
  padding: 0 4px;
}

/* 题材筛选与视频行列表 */
.video-listing {
  padding: 48px 0;
}

.video-listing .section-head {
  max-width: 1080px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

.filter-tags {
  max-width: 1080px;
  margin: 0 auto 32px;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-tag {
  padding: 8px 18px;
  font-size: 14px;
  color: #1F2937;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.filter-tag:hover {
  border-color: #E8590C;
  color: #E8590C;
}

.filter-tag.is-active {
  background-color: #E8590C;
  border-color: #E8590C;
  color: #FFFFFF;
}

.video-row-list {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.video-row-item {
  display: flex;
  align-items: center;
  gap: 20px;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.video-row-item:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.video-row-item img {
  width: 180px;
  height: 110px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

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

.row-title {
  font-size: 16px;
  font-weight: 600;
  color: #1F2937;
  margin-bottom: 6px;
}

.row-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.channel-name {
  font-size: 13px;
  color: #6B7280;
}

.row-desc {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.row-link {
  font-size: 14px;
  color: #E8590C;
  white-space: nowrap;
  flex-shrink: 0;
  padding-left: 12px;
}

.row-link:hover {
  color: #C74A08;
}

/* 专题片单推荐 */
.featured-collections {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #F2F2F0;
  border-bottom: 1px solid #F2F2F0;
}

.featured-collections .section-head {
  max-width: 1080px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

.collection-grid {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.collection-card {
  background-color: #FAFAF9;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.collection-card:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.collection-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 12px;
}

.collection-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.collection-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  margin-bottom: 12px;
}

.card-link {
  font-size: 14px;
  color: #E8590C;
  font-weight: 500;
}

.card-link:hover {
  color: #C74A08;
}

/* 使用路径引导 */
.path-guide {
  padding: 48px 0;
}

.path-guide .section-title {
  max-width: 1080px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

.path-steps {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.path-guide .step-item {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.path-guide .step-item:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: #E8590C;
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  margin-bottom: 12px;
}

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

.path-guide .step-item p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  margin-bottom: 12px;
}

.path-guide .step-item a {
  font-size: 14px;
  color: #E8590C;
  font-weight: 500;
}

.path-guide .step-item a:hover {
  color: #C74A08;
}

/* 版本动态摘要 */
.updates-summary {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #F2F2F0;
  border-bottom: 1px solid #F2F2F0;
}

.updates-summary .section-head {
  max-width: 1080px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

.update-list {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.update-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  background-color: #FAFAF9;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
}

.version-tag {
  display: inline-block;
  padding: 3px 12px;
  font-size: 13px;
  font-weight: 500;
  color: #E8590C;
  background-color: rgba(232, 89, 12, 0.08);
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.update-row p {
  font-size: 14px;
  color: #1F2937;
  line-height: 1.6;
}

/* 内容边界提示条 */
.content-boundary-note {
  max-width: 1080px;
  margin: 32px auto 0;
  padding: 0 24px;
}

.content-boundary-note p {
  background-color: #F2F2F0;
  border-radius: 8px;
  padding: 16px 20px;
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
}

.content-boundary-note strong {
  color: #1F2937;
  font-weight: 600;
}

/* 首页相关链接 */
.related-links {
  max-width: 1080px;
  margin: 32px auto 0;
  padding: 0 24px 48px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 14px;
  color: #6B7280;
}

.related-links-item {
  font-size: 14px;
  color: #E8590C;
  padding: 6px 14px;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #E8590C;
  color: #C74A08;
}

/* ============================================================
   pages — channels 频道分类
   ============================================================ */
.page-content {
  padding-bottom: 48px;
}

.tag-explanation-section {
  margin-bottom: 40px;
}

.tag-explanation-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.tag-explanation-section p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 760px;
}

.channel-directory-section {
  margin-bottom: 40px;
}

.channel-directory-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.channel-table {
  display: flex;
  flex-direction: column;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  overflow: hidden;
  background-color: #FFFFFF;
}

.channel-row {
  display: grid;
  grid-template-columns: 140px 120px 1fr 180px;
  gap: 16px;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid #F2F2F0;
}

.channel-row:last-child {
  border-bottom: none;
}

.channel-row.channel-header {
  background-color: #FAFAF9;
  font-size: 13px;
  font-weight: 600;
  color: #6B7280;
}

.cell-channel {
  font-size: 15px;
  font-weight: 600;
  color: #1F2937;
}

.cell-tag {
  font-size: 14px;
}

.cell-desc {
  font-size: 14px;
  color: #4B5563;
  line-height: 1.6;
}

.cell-video {
  font-size: 14px;
  color: #6B7280;
}

.browse-guide-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.browse-guide-section p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 760px;
}

.guide-media {
  margin: 20px 0;
}

.guide-figure {
  max-width: 640px;
}

.guide-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.guide-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 8px;
}

/* ============================================================
   pages — guide 新手入门
   ============================================================ */
.guide-steps {
  padding-bottom: 48px;
}

.guide-steps .section-title {
  margin-bottom: 8px;
}

.guide-steps .section-intro {
  margin-bottom: 28px;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.guide-steps .step-item {
  display: flex;
  gap: 20px;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.guide-steps .step-item:hover {
  border-color: #E8590C;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: #E8590C;
  color: #FFFFFF;
  font-size: 17px;
  font-weight: 600;
  border-radius: 6px;
  flex-shrink: 0;
}

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

.step-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 12px;
}

.step-figure {
  margin-top: 12px;
}

.step-figure img {
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: 8px;
}

.step-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 6px;
}

/* 页面功能对照 */
.function-compare {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #F2F2F0;
  border-bottom: 1px solid #F2F2F0;
}

.function-compare .section-title {
  margin-bottom: 8px;
}

.function-compare .section-intro {
  margin-bottom: 24px;
}

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

.compare-card {
  background-color: #FAFAF9;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.compare-card:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
}

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

.compare-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  margin-bottom: 12px;
}

.compare-card a {
  font-size: 14px;
  color: #E8590C;
  font-weight: 500;
}

.compare-card a:hover {
  color: #C74A08;
}

/* 高频疑问提示 */
.quick-questions {
  padding: 48px 0;
}

.quick-questions .section-title {
  margin-bottom: 8px;
}

.quick-questions .section-intro {
  margin-bottom: 24px;
}

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

.question-list li {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  padding: 14px 20px;
  transition: border-color 0.2s ease;
}

.question-list li:hover {
  border-color: #E8590C;
}

.question-list li a {
  font-size: 15px;
  color: #1F2937;
  font-weight: 500;
}

.question-list li a:hover {
  color: #E8590C;
}

.question-list li span {
  display: block;
  font-size: 13px;
  color: #6B7280;
  margin-top: 4px;
}

/* ============================================================
   pages — advanced 进阶技巧
   ============================================================ */
.tips-section {
  padding: 0 0 48px;
}

.tips-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

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

.tip-card {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.tip-card:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
}

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

.tip-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
}

.tips-figure {
  max-width: 640px;
  margin: 0 auto;
}

.tips-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.tips-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 8px;
  text-align: center;
}

.scenario-section {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #F2F2F0;
  border-bottom: 1px solid #F2F2F0;
}

.scenario-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

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

.scenario-card {
  background-color: #FAFAF9;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.scenario-card:hover {
  transform: translateY(-2px);
  border-color: #E8590C;
}

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

.scenario-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
}

.notice-section {
  padding: 48px 0;
}

.notice-section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

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

.notice-list li {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  padding: 14px 20px;
  font-size: 14px;
  color: #4B5563;
  line-height: 1.6;
  position: relative;
  padding-left: 40px;
}

.notice-list li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 22px;
  width: 6px;
  height: 6px;
  background-color: #E8590C;
  border-radius: 50%;
}

.related-nav {
  padding: 24px 0 48px;
}

.related-nav ul {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.related-nav ul li a {
  font-size: 14px;
  color: #E8590C;
  padding: 8px 16px;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  transition: border-color 0.2s ease;
}

.related-nav ul li a:hover {
  border-color: #E8590C;
  color: #C74A08;
}

/* ============================================================
   pages — updates 版本动态
   ============================================================ */
.content-block {
  padding: 0 0 48px;
}

.content-block h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.current-release p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  max-width: 760px;
  margin-bottom: 16px;
}

.content-figure {
  max-width: 640px;
  margin: 16px 0;
}

.content-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.content-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 8px;
}

.timeline-item {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 16px;
}

.timeline-item h3 {
  font-size: 17px;
  font-weight: 600;
  color: #E8590C;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 14px;
  color: #4B5563;
  line-height: 1.6;
  margin-bottom: 6px;
}

.timeline-item p strong {
  font-weight: 600;
  color: #1F2937;
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.archive-list li {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  padding: 12px 20px;
  font-size: 14px;
  color: #4B5563;
  display: flex;
  align-items: center;
  gap: 12px;
}

.archive-version {
  font-size: 13px;
  font-weight: 600;
  color: #E8590C;
  background-color: rgba(232, 89, 12, 0.08);
  padding: 2px 10px;
  border-radius: 4px;
  white-space: nowrap;
}

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

.inner-page-nav ul {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.inner-page-nav ul li a {
  font-size: 14px;
  color: #E8590C;
  padding: 8px 16px;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 6px;
  transition: border-color 0.2s ease;
}

.inner-page-nav ul li a:hover {
  border-color: #E8590C;
  color: #C74A08;
}

/* ============================================================
   pages — faq 观看问答
   ============================================================ */
.faq-section {
  padding: 0 0 48px;
}

.faq-section .section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.faq-figure {
  max-width: 640px;
  margin: 0 0 20px;
}

.faq-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.faq-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  margin-top: 8px;
}

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

.faq-item {
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: #E8590C;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #1F2937;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #E8590C;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: #4B5563;
  line-height: 1.7;
}

.faq-section .related-links {
  padding: 16px 0 0;
  margin: 0;
}

.faq-section .related-links p {
  font-size: 14px;
  color: #6B7280;
}

.faq-section .related-links a {
  color: #E8590C;
  font-weight: 500;
  margin-right: 16px;
}

.faq-section .related-links a:hover {
  color: #C74A08;
}

/* ============================================================
   pages — 404 页面
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  max-width: 560px;
  text-align: center;
  background-color: #FFFFFF;
  border: 1px solid #F2F2F0;
  border-radius: 8px;
  padding: 48px 40px;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: #E8590C;
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.error-tip {
  font-size: 13px;
  color: #9CA3AF;
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 900px) {
  .collection-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

  .channel-row {
    grid-template-columns: 120px 100px 1fr 150px;
    gap: 12px;
    padding: 12px 16px;
  }

  .footer-columns {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .layout-shell {
    padding-left: 16px;
    padding-right: 16px;
  }

  .breadcrumb {
    padding: 12px 16px 0;
  }

  .page-header {
    padding: 24px 16px 20px;
  }

  .page-header h1.page-title {
    font-size: 26px;
  }

  .hero-focus {
    padding: 32px 0;
  }

  .hero-focus .hero-copy {
    padding: 0 16px;
  }

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

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

  .hero-media {
    padding: 0 16px;
    margin-top: 24px;
  }

  .video-listing {
    padding: 32px 0;
  }

  .video-listing .section-head {
    padding: 0 16px;
  }

  .filter-tags {
    padding: 0 16px;
  }

  .video-row-list {
    padding: 0 16px;
  }

  .video-row-item {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px;
  }

  .video-row-item img {
    width: 100%;
    height: 180px;
  }

  .row-link {
    padding-left: 0;
  }

  .featured-collections {
    padding: 32px 0;
  }

  .featured-collections .section-head {
    padding: 0 16px;
  }

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

  .path-guide {
    padding: 32px 0;
  }

  .path-guide .section-title {
    padding: 0 16px;
  }

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

  .updates-summary {
    padding: 32px 0;
  }

  .updates-summary .section-head {
    padding: 0 16px;
  }

  .update-list {
    padding: 0 16px;
  }

  .update-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .content-boundary-note {
    padding: 0 16px;
  }

  .related-links {
    padding: 0 16px 32px;
  }

  .page-content {
    padding-bottom: 32px;
  }

  .channel-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 16px;
    border-bottom: 1px solid #F2F2F0;
  }

  .channel-row.channel-header {
    display: none;
  }

  .cell-channel {
    font-size: 16px;
  }

  .cell-tag {
    margin-bottom: 2px;
  }

  .guide-steps {
    padding-bottom: 32px;
  }

  .guide-steps .step-item {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .function-compare {
    padding: 32px 0;
  }

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

  .quick-questions {
    padding: 32px 0;
  }

  .tips-section {
    padding-bottom: 32px;
  }

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

  .scenario-section {
    padding: 32px 0;
  }

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

  .notice-section {
    padding: 32px 0;
  }

  .content-block {
    padding-bottom: 32px;
  }

  .faq-section {
    padding-bottom: 32px;
  }

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

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

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

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

@media (max-width: 480px) {
  .footer-columns {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .filter-tag {
    padding: 8px 14px;
    font-size: 13px;
  }

  .error-actions {
    flex-direction: column;
    width: 100%;
  }

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