/* ============================================================
   糖心vlog在线免费 · 全站样式表
   设计方向：教育机构风落地为内容导航课程视觉
   ============================================================ */

/* ============================================================
   1. Base —— 基础变量、重置与全局字体
   ============================================================ */
:root {
  --color-bg: #F7F6F1;
  --color-blue: #2F6FB2;
  --color-blue-dark: #245A8E;
  --color-blue-light: #E8F0F8;
  --color-orange: #E8912D;
  --color-card: #FFFFFF;
  --color-text: #2B2B2B;
  --color-text-secondary: #5A6572;
  --color-border: #E2E0D8;
  --color-white: #FFFFFF;
  --radius-card: 8px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 3px rgba(43, 43, 43, 0.06), 0 4px 12px rgba(43, 43, 43, 0.04);
  --shadow-hover: 0 4px 12px rgba(43, 43, 43, 0.08), 0 8px 24px rgba(43, 43, 43, 0.06);
  --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  --container-width: 1120px;
  --reading-width: 760px;
  --header-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  line-height: 1.35;
  color: var(--color-text);
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

p {
  margin-bottom: 0.75em;
}

p:last-child {
  margin-bottom: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 等宽字体用于版本号等 */
.version-value,
.version-label,
.changelog-version,
.step-num,
.step-number,
.error-code {
  font-family: var(--font-mono);
}

/* ============================================================
   2. Layout —— 全站统一骨架：页头、主容器、页脚
   ============================================================ */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

.site-header {
  background-color: var(--color-card);
  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 {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 20px;
  color: var(--color-text);
  line-height: 1.2;
}

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

.brand-name {
  letter-spacing: 0.02em;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  line-height: 1.4;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

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

.nav-list .nav-faq-link {
  margin-left: 8px;
}

.nav-list .nav-faq-link a {
  color: var(--color-orange);
  font-weight: 600;
}

.nav-list .nav-faq-link a:hover {
  color: var(--color-orange);
  background-color: rgba(232, 145, 45, 0.1);
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
}

.nav-toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
  border-radius: 2px;
  transition: background-color var(--transition-fast);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast);
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 6px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 12px;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

/* 页脚 */
.site-footer {
  background-color: #2B2B2B;
  color: #C9CDD3;
  font-size: 14px;
  margin-top: auto;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
}

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

.footer-col a {
  color: #C9CDD3;
  font-size: 14px;
  line-height: 1.6;
}

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

.footer-about {
  font-size: 14px;
  line-height: 1.7;
}

.footer-brand {
  color: var(--color-white);
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 10px;
}

.footer-boundary {
  color: #8A929C;
  font-size: 13px;
  line-height: 1.6;
  margin-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 12px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 18px 24px;
  text-align: center;
  color: #8A929C;
  font-size: 13px;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
}

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

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
  position: relative;
  padding-left: 14px;
}

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

.section-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  max-width: var(--reading-width);
}

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

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

.btn-primary:hover {
  background-color: var(--color-blue-dark);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(47, 111, 178, 0.25);
}

.btn-secondary {
  background-color: var(--color-card);
  color: var(--color-blue);
  border-color: var(--color-blue);
}

.btn-secondary:hover {
  background-color: var(--color-blue-light);
  color: var(--color-blue-dark);
  border-color: var(--color-blue-dark);
}

.btn-tertiary {
  background-color: transparent;
  color: var(--color-orange);
  border-color: var(--color-orange);
}

.btn-tertiary:hover {
  background-color: rgba(232, 145, 45, 0.1);
  color: var(--color-orange);
}

/* 卡片 hover 上浮 */
.video-card,
.scene-card,
.special-card,
.channel-card,
.related-card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.video-card:hover,
.scene-card:hover,
.special-card:hover,
.channel-card:hover,
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  padding-right: 42px;
  list-style: none;
  transition: color var(--transition-fast);
}

.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-blue);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary {
  color: var(--color-blue);
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* 标签 / 筛选标签 */
.filter-tags,
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-tag,
.category-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 32px;
}

.filter-tag:hover,
.category-tag:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
  background-color: var(--color-blue-light);
}

.filter-tag.is-active,
.category-tag.is-active {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
}

/* 相关入口卡片 */
.related-links {
  margin-top: 48px;
}

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

.related-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px 24px;
  min-height: 96px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.related-card h3,
.related-card .related-title,
.related-card .related-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 6px;
}

.related-card p,
.related-card .related-desc,
.related-card .related-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

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

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

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

figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-top: 8px;
  text-align: center;
}

.content-media {
  margin-bottom: 16px;
}

.content-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  object-fit: cover;
}

.content-media-inline {
  max-width: var(--reading-width);
}

/* 步骤序号 */
.step-num,
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-orange);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
  line-height: 1;
}

/* ============================================================
   4. Pages —— 首页
   ============================================================ */

.home-main {
  width: 100%;
}

/* 首屏焦点区 */
.hero {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 30px;
  line-height: 1.35;
  margin-bottom: 14px;
  color: var(--color-text);
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 480px;
}

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

.hero-media {
  position: relative;
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

/* 浏览路径三步 */
.path-section {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 40px 24px;
}

.path-section .section-title {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

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

.path-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background-color: var(--color-bg);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
}

.path-step .step-num {
  margin-top: 2px;
}

.path-step h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.path-step p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
}

.path-step a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
}

/* 频道中心概览 */
.channel-overview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.overview-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.filter-panel {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.filter-panel h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-text);
}

.filter-panel .filter-tags {
  flex-direction: column;
  align-items: stretch;
}

.filter-panel .filter-tag {
  border-radius: var(--radius-sm);
  text-align: left;
  padding: 8px 12px;
  border: 0;
  background-color: transparent;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.filter-panel .filter-tag:hover {
  background-color: var(--color-blue-light);
  color: var(--color-blue);
}

.filter-panel .filter-tag.is-active {
  background-color: var(--color-blue-light);
  color: var(--color-blue);
  font-weight: 600;
}

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

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

.time-group h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-blue-light);
}

.video-card {
  display: flex;
  gap: 14px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 12px;
  margin-bottom: 10px;
  align-items: flex-start;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.video-card img {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.video-card .card-info {
  min-width: 0;
}

.video-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.4;
}

.video-card .tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-blue);
  background-color: var(--color-blue-light);
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 4px;
  font-weight: 500;
}

.video-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

.overview-more {
  margin-top: 16px;
  text-align: right;
}

.overview-more a {
  font-size: 14px;
  font-weight: 600;
}

/* 使用场景 */
.scenes {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
}

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

.scene-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.scene-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.scene-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
  flex: 1;
}

.scene-card a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
}

/* 专题片单 */
.specials {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 40px 24px;
}

.specials .section-title {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.special-cards {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.special-card {
  display: flex;
  gap: 16px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 16px;
  align-items: center;
}

.special-card img {
  width: 160px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

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

.special-info h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.special-info a {
  font-size: 14px;
  font-weight: 600;
}

/* 版本摘要 */
.version-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.version-info {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
}

.version-number {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.changelog-preview {
  list-style: none;
  margin-bottom: 16px;
}

.changelog-preview li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
}

.changelog-preview li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-orange);
}

.version-info a {
  font-size: 14px;
  font-weight: 600;
}

/* FAQ 摘选 */
.faq-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.faq-preview .faq-list {
  max-width: var(--reading-width);
}

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

.faq-more a {
  font-size: 14px;
  font-weight: 600;
}

/* 反馈入口条 */
.feedback-banner {
  background-color: var(--color-blue);
  padding: 32px 24px;
  text-align: center;
}

.feedback-banner .section-title {
  color: var(--color-white);
  padding-left: 0;
}

.feedback-banner .section-title::before {
  display: none;
}

.feedback-banner p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  margin-bottom: 16px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.feedback-banner .btn-primary {
  background-color: var(--color-white);
  color: var(--color-blue);
}

.feedback-banner .btn-primary:hover {
  background-color: var(--color-blue-light);
  color: var(--color-blue-dark);
}

/* ============================================================
   5. Pages —— 内页统一骨架
   ============================================================ */

.page-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0 20px;
  margin-bottom: 32px;
}

.page-header .page-title {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 8px;
}

.page-header .page-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: var(--reading-width);
  line-height: 1.7;
  margin: 0;
}

.page-header .content-media-inline {
  margin-bottom: 12px;
}

/* ============================================================
   6. Pages —— 频道中心（pindao.html）
   ============================================================ */

.channel-filter {
  margin-bottom: 24px;
}

.channel-filter .section-title {
  margin-bottom: 14px;
}

.channel-filter .filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

.channel-card {
  display: flex;
  gap: 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  margin-bottom: 16px;
}

.channel-media {
  flex-shrink: 0;
}

.channel-media img {
  width: 200px;
  height: 130px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.channel-info {
  min-width: 0;
  flex: 1;
}

.channel-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.channel-topic {
  display: inline-block;
  font-size: 13px;
  color: var(--color-blue);
  background-color: var(--color-blue-light);
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 500;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 8px;
}

.channel-represent {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.channel-represent strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   7. Pages —— 使用场景（changjing.html）
   ============================================================ */

.scene-nav {
  margin-bottom: 32px;
}

.scene-nav .section-title {
  margin-bottom: 8px;
}

.scene-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.scene-tab {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.scene-tab:hover,
.scene-tab.is-active {
  border-color: var(--color-blue);
  color: var(--color-blue);
  background-color: var(--color-blue-light);
}

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

.scene-list .scene-card {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  padding: 0;
  overflow: hidden;
}

.scene-card-media {
  position: relative;
}

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

.scene-card-media figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(43, 43, 43, 0.7);
  color: var(--color-white);
  font-size: 12px;
  padding: 6px 12px;
  margin: 0;
  text-align: left;
}

.scene-card-body {
  padding: 24px 24px 24px 0;
}

.scene-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.scene-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.device-suggest,
.content-recommend {
  margin-bottom: 12px;
}

.device-suggest h4,
.content-recommend h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 4px;
}

.device-suggest p,
.content-recommend p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 内容边界提示 */
.boundary-note {
  background-color: var(--color-blue-light);
  border-left: 4px solid var(--color-blue);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 32px 0;
}

.boundary-note .section-title {
  font-size: 16px;
  margin-bottom: 8px;
  padding-left: 0;
}

.boundary-note .section-title::before {
  display: none;
}

.boundary-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   8. Pages —— 版本说明（banben.html）
   ============================================================ */

.block {
  margin-bottom: 40px;
}

.current-version .section-title,
.version-switch .section-title,
.changelog .section-title {
  margin-bottom: 14px;
}

.version-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.version-number {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.version-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.version-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-blue);
  font-family: var(--font-mono);
}

.version-scope h3,
.version-structure h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.version-scope p,
.version-structure p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* 版本切换 */
.version-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.version-tab {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 40px;
}

.version-tab:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.version-tab.is-active {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
}

.version-panels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.version-panel {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px 24px;
}

.version-panel h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.version-panel ul {
  list-style: none;
}

.version-panel li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.version-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-blue);
}

/* 变更记录时间线 */
.changelog-list {
  list-style: none;
  position: relative;
  padding-left: 0;
}

.changelog-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.changelog-item:last-child {
  border-bottom: 0;
}

.changelog-version {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-orange);
  font-family: var(--font-mono);
  padding-top: 2px;
}

.changelog-content h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.changelog-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 版本页相关入口 */
.related .related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 0;
}

/* ============================================================
   9. Pages —— 观看指南（zhinan.html）
   ============================================================ */

.preface {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 32px;
}

.preface .section-title {
  margin-bottom: 10px;
}

.preface p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.preface a {
  font-weight: 600;
}

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

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

.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: var(--reading-width);
}

.step-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 16px;
}

.step-item .step-number {
  width: 36px;
  height: 36px;
  font-size: 16px;
  flex-shrink: 0;
  margin-top: 2px;
}

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

.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 8px;
}

.step-content .step-tip {
  font-size: 13px;
  background-color: var(--color-blue-light);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  margin-bottom: 8px;
}

.step-content .step-tip strong {
  color: var(--color-blue);
  font-weight: 600;
}

.step-content .step-link {
  margin: 0;
}

.step-content .step-link a {
  font-size: 14px;
  font-weight: 600;
}

/* 质量检查清单 */
.checklist-section {
  margin-bottom: 40px;
}

.checklist-list {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px 24px 24px 48px;
  list-style: none;
}

.checklist-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  padding: 6px 0;
  position: relative;
}

.checklist-list li::before {
  content: "✓";
  position: absolute;
  left: -24px;
  color: var(--color-blue);
  font-weight: 700;
}

/* ============================================================
   10. Pages —— 帮助支持（bangzhu.html）
   ============================================================ */

.help-guide-media {
  margin-bottom: 32px;
}

.help-media-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
}

.help-categories {
  margin-bottom: 40px;
}

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

.section-heading h2 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
}

.section-heading h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-blue);
}

.section-heading p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: var(--reading-width);
}

.help-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  align-items: start;
}

.help-category-nav {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 12px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.help-category-nav ul {
  list-style: none;
}

.help-category-nav li {
  margin-bottom: 4px;
}

.help-category-nav a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.help-category-nav a:hover,
.help-category-nav a.is-active {
  background-color: var(--color-blue-light);
  color: var(--color-blue);
  font-weight: 600;
}

.help-category-panels {
  min-width: 0;
}

.help-panel {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 16px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.help-panel h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-blue);
}

.help-panel p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* 反馈方式 */
.feedback-guide {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 40px;
}

.feedback-step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feedback-step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feedback-step-item .step-number {
  width: 32px;
  height: 32px;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.feedback-step-item .step-content h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.feedback-step-item .step-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.feedback-note {
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-top: 20px;
}

.feedback-note p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ============================================================
   11. Pages —— 常见问题（wenti.html）
   ============================================================ */

.faq-guide {
  margin-bottom: 24px;
}

.faq-guide-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  max-width: var(--reading-width);
}

.faq-categories {
  margin-bottom: 24px;
}

.faq-categories .section-title {
  margin-bottom: 14px;
}

.faq-list {
  margin-bottom: 24px;
}

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

.faq-group-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-blue-light);
}

.faq-group .faq-item {
  max-width: var(--reading-width);
}

/* ============================================================
   12. Pages —— 404
   ============================================================ */

.site-error {
  min-height: 100vh;
}

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

.error-content {
  text-align: center;
  padding: 60px 24px;
  max-width: 520px;
}

.error-code {
  font-size: 72px;
  font-weight: 800;
  color: var(--color-blue);
  line-height: 1;
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

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

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.error-tip {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.btn-back-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background-color: var(--color-blue);
  color: var(--color-white);
  border-radius: var(--radius-card);
  font-size: 15px;
  font-weight: 600;
  min-height: 44px;
  transition: background-color var(--transition-fast);
}

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

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

/* 平板：1024px */
@media (max-width: 1024px) {
  .hero {
    gap: 32px;
    padding: 40px 24px 32px;
  }

  .overview-layout {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }

  .footer-columns {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }

  .scene-list .scene-card {
    grid-template-columns: 260px 1fr;
  }

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

  .help-layout {
    grid-template-columns: 180px 1fr;
    gap: 24px;
  }

  .special-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .special-card img {
    width: 100%;
    height: auto;
    max-height: 160px;
  }
}

/* 手机：768px */
@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    padding: 0 16px;
    height: 56px;
    gap: 12px;
  }

  .brand {
    font-size: 18px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: static;
  }

  .nav-list {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 2px;
    display: none;
    box-shadow: 0 8px 16px rgba(43, 43, 43, 0.08);
  }

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

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  .nav-list .nav-faq-link {
    margin-left: 0;
    margin-top: 4px;
    border-top: 1px solid var(--color-border);
    padding-top: 4px;
  }

  /* 主容器 */
  .inner-main {
    padding: 0 16px 40px;
  }

  .breadcrumb {
    padding: 14px 0 4px;
    font-size: 13px;
  }

  .page-header {
    padding: 20px 0 16px;
    margin-bottom: 24px;
  }

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

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

  /* 首页 hero */
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 28px;
  }

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

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .hero-media {
    order: -1;
  }

  /* 浏览路径 */
  .path-section {
    padding: 32px 16px;
  }

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

  .path-step {
    padding: 16px;
  }

  /* 频道概览 */
  .channel-overview {
    padding: 32px 16px 16px;
  }

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

  .filter-panel {
    position: static;
    padding: 16px;
  }

  .filter-panel .filter-tags {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .filter-panel .filter-tag {
    flex-shrink: 0;
    white-space: nowrap;
    border: 1px solid var(--color-border);
    background-color: var(--color-card);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 13px;
  }

  .video-card {
    flex-direction: row;
    padding: 10px;
  }

  .video-card img {
    width: 96px;
    height: 64px;
  }

  .video-card h4 {
    font-size: 14px;
  }

  /* 使用场景 */
  .scenes {
    padding: 32px 16px;
  }

  .scene-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .scene-card {
    padding: 20px;
  }

  /* 专题片单 */
  .specials {
    padding: 32px 16px;
  }

  .special-cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 版本摘要 */
  .version-summary {
    padding: 32px 16px;
  }

  .version-info {
    padding: 20px;
  }

  /* FAQ */
  .faq-preview {
    padding: 0 16px 32px;
  }

  /* 反馈横幅 */
  .feedback-banner {
    padding: 28px 16px;
  }

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

  .footer-bottom {
    padding: 14px 16px;
  }

  /* 频道中心 */
  .channel-filter {
    margin-bottom: 20px;
  }

  .channel-filter .filter-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .channel-filter .filter-tag {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .channel-card {
    flex-direction: column;
    gap: 12px;
    padding: 14px;
  }

  .channel-media img {
    width: 100%;
    height: auto;
    max-height: 180px;
  }

  /* 使用场景内页 */
  .scene-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .scene-tab {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .scene-list .scene-card {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .scene-card-media img {
    min-height: 160px;
    max-height: 200px;
  }

  .scene-card-body {
    padding: 20px 16px;
  }

  .boundary-note {
    padding: 16px 18px;
    margin: 24px 0;
  }

  /* 版本说明 */
  .version-card {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

  .version-tabs {
    flex-wrap: wrap;
  }

  .version-tab {
    flex: 1;
    text-align: center;
    min-width: 80px;
  }

  .version-panel {
    padding: 16px;
  }

  .changelog-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 0;
  }

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

  /* 观看指南 */
  .preface {
    padding: 20px;
    margin-bottom: 24px;
  }

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

  .step-item .step-number {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .checklist-list {
    padding: 20px 20px 20px 40px;
  }

  /* 帮助支持 */
  .help-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .help-category-nav {
    position: static;
    padding: 8px;
  }

  .help-category-nav ul {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 4px;
  }

  .help-category-nav li {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .help-category-nav a {
    padding: 8px 14px;
    white-space: nowrap;
    font-size: 13px;
  }

  .help-panel {
    padding: 20px;
  }

  .feedback-guide {
    padding: 20px;
  }

  .feedback-step-item {
    flex-direction: column;
    gap: 8px;
  }

  /* 常见问题 */
  .faq-categories .category-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .category-tag {
    flex-shrink: 0;
    white-space: nowrap;
  }

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

  .faq-item p {
    padding: 0 16px 12px;
    font-size: 13px;
  }

  /* 相关入口 */
  .related-cards,
  .related-card-grid,
  .related-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .related-card {
    padding: 16px 20px;
    min-height: 0;
  }

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

  .error-content {
    padding: 40px 16px;
  }
}

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

  .brand {
    font-size: 16px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-actions .btn {
    font-size: 14px;
    padding: 10px 16px;
  }

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

  .video-card img {
    width: 100%;
    height: auto;
    max-height: 120px;
  }

  .special-card {
    padding: 12px;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .channel-media img {
    max-height: 140px;
  }

  .scene-card-media img {
    min-height: 140px;
  }

  .version-tab {
    font-size: 13px;
    padding: 8px 12px;
    min-width: 70px;
  }

  .changelog-item {
    grid-template-columns: 1fr;
  }

  .help-category-nav a {
    padding: 8px 10px;
    font-size: 13px;
  }

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