/* ============================================================
   BASE — 基础变量、重置与全局排版
   ============================================================ */
:root {
  --color-bg: #FFFFFF;
  --color-text: #0F1A24;
  --color-primary: #F5A623;
  --color-secondary: #2EC4B6;
  --color-section-bg: #F4F6F8;
  --color-muted: #9AA7B4;
  --color-border: #E3E8ED;
  --color-white: #FFFFFF;
  --color-dark: #0F1A24;
  --color-primary-dark: #D98E12;
  --color-secondary-dark: #1FA89C;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container-width: 1200px;
  --container-inner: 1100px;
  --header-height: 72px;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-size-base: 16px;
  --line-height-body: 1.7;
  --line-height-title: 1.3;
  --transition-base: 0.2s ease;
  --shadow-card: 0 2px 8px rgba(15, 26, 36, 0.06);
  --shadow-card-hover: 0 6px 20px rgba(15, 26, 36, 0.1);
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  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-primary-dark);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: var(--line-height-title);
  font-weight: 700;
  color: var(--color-text);
}

p {
  line-height: var(--line-height-body);
}

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

/* ============================================================
   LAYOUT — 全站骨架：页头、导航、页脚、主容器
   ============================================================ */

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

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

.brand-area {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-muted);
  white-space: nowrap;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-group {
  position: relative;
}

.nav-group-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  padding: 8px 16px 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-group-list {
  display: flex;
  gap: 2px;
  padding: 0 8px 8px;
}

.nav-group-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

.nav-group-list li a.is-current {
  background-color: rgba(245, 166, 35, 0.12);
  color: var(--color-primary-dark);
  font-weight: 600;
}

/* 汉堡按钮（移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* ---- 页脚 ---- */
.site-footer {
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.footer-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  transition: color var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 20px 24px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
  display: inline;
}

.footer-bottom p + p {
  margin-left: 8px;
}

/* ---- 主容器 ---- */
.site-main {
  min-height: 60vh;
}

/* 首页主容器 */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 内页主容器 */
.inner-main {
  max-width: var(--container-inner);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 面包屑 ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 14px;
}

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

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

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

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

/* ---- 内页标题区 ---- */
.page-header {
  padding: 28px 0 36px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.page-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

/* ---- Section 标题体系 ---- */
.section-head {
  margin-bottom: 32px;
}

.section-heading {
  margin-bottom: 32px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 680px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 680px;
  margin-bottom: 24px;
}

/* ============================================================
   COMPONENTS — 通用组件
   ============================================================ */

/* ---- 按钮 ---- */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
  border: none;
  cursor: pointer;
}

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

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

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

.btn-secondary:hover {
  background-color: rgba(245, 166, 35, 0.08);
  color: var(--color-primary-dark);
}

/* ---- 卡片通用 ---- */
.dim-card,
.playlist-card,
.topic-card,
.duration-card,
.scene-card,
.method-card,
.feedback-card,
.related-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.dim-card:hover,
.playlist-card:hover,
.topic-card:hover,
.duration-card:hover,
.scene-card:hover,
.method-card:hover,
.feedback-card:hover,
.related-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

/* ---- FAQ 折叠项 ---- */
.faq-item {
  background-color: var(--color-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-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background-color var(--transition-base);
}

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

.faq-item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

.faq-item summary:hover {
  background-color: var(--color-section-bg);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: var(--line-height-body);
}

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

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

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

/* ---- 相关链接（首页底部） ---- */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-muted);
  padding: 6px 14px;
  background-color: var(--color-section-bg);
  border-radius: 20px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.related-links-item:hover {
  background-color: rgba(245, 166, 35, 0.12);
  color: var(--color-primary-dark);
}

/* ============================================================
   PAGES — 首页
   ============================================================ */

/* ---- Hero 区 ---- */
.hero-section {
  padding: 56px 0 48px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.hero-intro {
  padding-top: 16px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-secondary-dark);
  background-color: rgba(46, 196, 182, 0.1);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero-intro h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-slogan {
  font-size: 17px;
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-media {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-figure {
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  aspect-ratio: 4 / 3;
  width: 100%;
  height: auto;
}

/* ---- Hero 频道列表 ---- */
.hero-channels {
  grid-column: 1 / -1;
  margin-top: 24px;
}

.hero-channels .section-title {
  font-size: 20px;
  margin-bottom: 20px;
}

.channel-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.channel-item {
  background-color: var(--color-section-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.channel-item:hover {
  background-color: var(--color-white);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.channel-item a {
  display: block;
  padding: 20px;
  text-decoration: none;
}

.channel-name {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.channel-desc {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* ---- 内容分类索引 ---- */
.category-index-section {
  padding: 56px 0;
  border-top: 1px solid var(--color-border);
}

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

.dim-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dim-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-secondary-dark);
  background-color: rgba(46, 196, 182, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: 4px;
}

.dim-card h3 {
  font-size: 18px;
  font-weight: 700;
}

.dim-card p {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.dim-card a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
  padding-top: 4px;
}

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

/* ---- 特色片单精选 ---- */
.specials-section {
  padding: 56px 0;
  border-top: 1px solid var(--color-border);
}

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

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

.playlist-cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.playlist-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.playlist-card:hover .playlist-cover img {
  transform: scale(1.03);
}

.playlist-card h3 {
  font-size: 17px;
  font-weight: 700;
  padding: 20px 20px 8px;
}

.playlist-audience {
  font-size: 13px;
  color: var(--color-secondary-dark);
  padding: 0 20px 8px;
  font-weight: 500;
}

.playlist-desc {
  font-size: 14px;
  color: var(--color-muted);
  padding: 0 20px;
  flex-grow: 1;
}

.playlist-card > a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  padding: 12px 20px 20px;
}

.playlist-card > a:hover {
  color: var(--color-primary);
}

/* ---- 观看指南流程 ---- */
.guide-steps-section {
  padding: 56px 0;
  border-top: 1px solid var(--color-border);
}

.guide-steps-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.guide-step {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  font-weight: 800;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  margin-bottom: 4px;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

/* ---- 新手入门引导条 ---- */
.newbie-entry-section {
  padding: 24px 0 0;
}

.newbie-banner {
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.newbie-text h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.newbie-text p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 560px;
}

.newbie-banner .btn-primary {
  flex-shrink: 0;
}

/* ---- FAQ 摘要 ---- */
.faq-preview-section {
  padding: 56px 0 24px;
}

.faq-preview-list {
  max-width: 860px;
}

.faq-more-link {
  margin-top: 16px;
  font-size: 14px;
}

.faq-more-link a {
  font-weight: 600;
  color: var(--color-primary-dark);
}

/* ============================================================
   PAGES — 内容分类页（category）
   ============================================================ */

/* 按题材分类 */
.category-topic {
  margin-bottom: 56px;
}

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

.topic-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.topic-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

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

.topic-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-grow: 1;
}

.topic-name {
  font-size: 17px;
  font-weight: 700;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.topic-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
}

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

/* 按时长分类 */
.category-duration {
  margin-bottom: 56px;
}

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

.duration-card {
  padding: 28px 24px;
  border-left: 4px solid var(--color-secondary);
}

.duration-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.duration-name {
  font-size: 18px;
  font-weight: 700;
}

.duration-range {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-secondary-dark);
  background-color: rgba(46, 196, 182, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  align-self: flex-start;
}

.duration-desc {
  font-size: 14px;
  color: var(--color-muted);
}

/* 按场景分类 */
.category-scene {
  margin-bottom: 56px;
}

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

.scene-card {
  padding: 24px 20px;
}

.scene-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scene-name {
  font-size: 16px;
  font-weight: 700;
}

.scene-desc {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.scene-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
}

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

/* 分类提示 */
.category-tip {
  margin-bottom: 24px;
}

.tip-inner {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.tip-inner .section-title {
  font-size: 20px;
}

.tip-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-top: 8px;
}

.tip-desc a {
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-right: 12px;
}

/* ============================================================
   PAGES — 特色片单页（specials）
   ============================================================ */

.playlist-grid {
  margin-bottom: 56px;
}

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

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

.playlist-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.playlist-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.playlist-card:hover .playlist-media img {
  transform: scale(1.03);
}

.playlist-body {
  padding: 24px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.playlist-name {
  font-size: 19px;
  font-weight: 700;
}

.playlist-audience {
  font-size: 13px;
  color: var(--color-secondary-dark);
  font-weight: 500;
}

.playlist-audience strong {
  font-weight: 700;
}

.playlist-desc {
  font-size: 14px;
  color: var(--color-muted);
}

.playlist-order {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.order-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.order-list {
  padding-left: 18px;
  list-style: decimal;
}

.order-list li {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 4px;
}

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

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

.playlist-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
  margin-top: auto;
}

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

/* 片单使用说明 */
.playlist-usage {
  margin-bottom: 24px;
}

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

.usage-step {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 15px;
  font-weight: 800;
  color: var(--color-white);
  background-color: var(--color-secondary);
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-muted);
}

.usage-note {
  background-color: rgba(245, 166, 35, 0.08);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-muted);
}

.usage-note a {
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-right: 8px;
}

/* ============================================================
   PAGES — 观看指南页（guide）
   ============================================================ */

.guide-content {
  display: flex;
  flex-direction: column;
  gap: 56px;
  margin-bottom: 24px;
}

/* 找视频的三种方式 */
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.method-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 4px solid var(--color-primary);
}

.method-name {
  font-size: 18px;
  font-weight: 700;
}

.method-desc {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.method-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
}

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

/* 入口核验清单 */
.checklist-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.checklist-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.checklist-item-title {
  font-size: 16px;
  font-weight: 700;
}

.checklist-item-desc {
  font-size: 14px;
  color: var(--color-muted);
}

/* 观看中的常见问题 */
.issue-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.issue-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.issue-question {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-base);
}

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

.issue-question::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

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

.issue-question:hover {
  background-color: var(--color-section-bg);
}

.issue-answer {
  padding: 0 20px 16px;
}

.issue-answer p {
  font-size: 14px;
  color: var(--color-muted);
}

/* 相关阅读 */
.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 32px 0;
}

.related-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-title {
  font-size: 16px;
  font-weight: 700;
}

.related-text {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.related-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
}

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

/* 指南配图 */
.guide-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 8px;
}

.guide-figure img {
  aspect-ratio: 21 / 9;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.figure-caption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 8px 4px 0;
}

/* ============================================================
   PAGES — 新手入门页（newbie）
   ============================================================ */

.what-is-section,
.site-map-section,
.three-steps-section {
  margin-bottom: 56px;
}

.what-is-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.what-is-text p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.what-is-text p:last-child {
  margin-bottom: 0;
}

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

.what-is-figure img {
  aspect-ratio: 4 / 3;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.what-is-figure figcaption {
  padding: 12px;
  background-color: var(--color-section-bg);
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
}

/* 网站结构地图 */
.site-map-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 16px;
  margin-bottom: 16px;
}

.map-node {
  flex: 1 1 160px;
  max-width: 200px;
  background-color: var(--color-section-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.map-node h3 {
  font-size: 15px;
  font-weight: 700;
}

.map-node p {
  font-size: 13px;
  color: var(--color-muted);
  flex-grow: 1;
}

.map-node a {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary-dark);
}

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

.map-tip {
  font-size: 14px;
  color: var(--color-muted);
  background-color: rgba(46, 196, 182, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 20px;
}

.map-tip strong {
  color: var(--color-secondary-dark);
}

/* 新手三步走 */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  font-size: 16px;
  font-weight: 800;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.step-content p {
  font-size: 14px;
  color: var(--color-muted);
}

.step-content p a {
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-right: 12px;
}

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

/* ============================================================
   PAGES — 问题答疑页（faq）
   ============================================================ */

.faq-section {
  margin-bottom: 56px;
}

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

.content-media-inline {
  max-width: 720px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
}

.content-media-inline img {
  aspect-ratio: 21 / 9;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
}

/* 更多问题引导 */
.faq-more {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
}

.faq-more h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.faq-more p {
  font-size: 14px;
  color: var(--color-muted);
}

.faq-more p a {
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-right: 16px;
  white-space: nowrap;
}

.faq-more p a:hover {
  color: var(--color-primary);
}

/* ============================================================
   PAGES — 关于本站页（about）
   ============================================================ */

.about-section {
  margin-bottom: 56px;
}

.about-section .section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.about-description-content {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
  align-items: center;
}

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

.about-figure img {
  aspect-ratio: 4 / 3;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

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

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

/* 内容组织方式 */
.org-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.org-item {
  background-color: var(--color-section-bg);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 4px solid var(--color-secondary);
}

.org-item-title {
  font-size: 17px;
  font-weight: 700;
}

.org-item-text {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.org-item-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  align-self: flex-start;
}

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

/* 站内反馈途径 */
.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feedback-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feedback-card-title {
  font-size: 17px;
  font-weight: 700;
}

.feedback-card-text {
  font-size: 14px;
  color: var(--color-muted);
  flex-grow: 1;
}

.feedback-card-text a {
  font-weight: 600;
  color: var(--color-primary-dark);
  display: inline-block;
  margin-top: 8px;
}

.feedback-card-text a:hover {
  color: var(--color-primary);
}

.feedback-note {
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-section-bg);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin-top: 24px;
}

/* ============================================================
   PAGES — 404 页面
   ============================================================ */

.error-main {
  max-width: var(--container-inner);
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

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

.error-code {
  font-size: 80px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto 24px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 32px;
  font-size: 15px;
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-dark);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

.error-links {
  border-top: 1px solid var(--color-border);
  padding-top: 40px;
}

.error-links-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}

.error-links-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.error-links-list li a {
  display: inline-block;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-section-bg);
  border-radius: 20px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.error-links-list li a:hover {
  background-color: rgba(245, 166, 35, 0.12);
  color: var(--color-primary-dark);
}

/* ============================================================
   RESPONSIVE — 响应式断点
   ============================================================ */

/* ---- 平板（≤1024px） ---- */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-media {
    order: -1;
  }

  .hero-figure {
    max-width: 100%;
  }

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

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

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

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

  .what-is-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .what-is-figure {
    max-width: 480px;
  }

  .about-description-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-figure {
    max-width: 480px;
  }

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

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

  .playlist-cards {
    grid-template-columns: 1fr;
    max-width: 640px;
  }

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

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

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

/* ---- 手机（≤768px） ---- */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    height: 64px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(15, 26, 36, 0.08);
  }

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

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

  .nav-group {
    width: 100%;
  }

  .nav-group-label {
    padding: 8px 12px 4px;
  }

  .nav-group-list {
    flex-direction: column;
    padding: 0 12px 8px;
  }

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

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

  /* 面包屑 */
  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  /* 页面标题 */
  .page-header {
    padding: 20px 0 28px;
    margin-bottom: 36px;
  }

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

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

  /* Hero */
  .hero-section {
    padding: 32px 0;
  }

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

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

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

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

  .channel-list {
    grid-template-columns: 1fr;
  }

  /* 分类索引 */
  .category-index-section,
  .specials-section,
  .guide-steps-section,
  .faq-preview-section {
    padding: 40px 0;
  }

  .category-dim-grid {
    grid-template-columns: 1fr;
  }

  .playlist-card-row {
    grid-template-columns: 1fr;
  }

  .guide-steps-list {
    grid-template-columns: 1fr;
  }

  /* 新手引导条 */
  .newbie-banner {
    padding: 28px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .newbie-banner .btn-primary {
    width: 100%;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 分类页 */
  .topic-grid {
    grid-template-columns: 1fr;
  }

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

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

  .tip-inner {
    padding: 24px 20px;
  }

  /* 片单页 */
  .playlist-cards {
    grid-template-columns: 1fr;
    max-width: 100%;
  }

  .usage-steps {
    grid-template-columns: 1fr;
  }

  /* 指南页 */
  .method-grid {
    grid-template-columns: 1fr;
  }

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

  .guide-figure img {
    aspect-ratio: 16 / 10;
  }

  /* 新手页 */
  .site-map-flow {
    flex-direction: column;
  }

  .map-node {
    max-width: 100%;
  }

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

  /* FAQ 页 */
  .faq-section h2 {
    font-size: 20px;
  }

  .faq-more {
    padding: 24px 20px;
  }

  .faq-more p a {
    display: inline-block;
    margin-bottom: 8px;
  }

  /* 关于页 */
  .org-list {
    grid-template-columns: 1fr;
  }

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

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

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

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

  .error-links-list {
    flex-direction: column;
    align-items: center;
  }

  .error-links-list li a {
    width: 200px;
    text-align: center;
  }
}

/* ---- 超小屏（≤390px） ---- */
@media (max-width: 390px) {
  .brand-name {
    font-size: 20px;
  }

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

  .section-title {
    font-size: 20px;
  }

  .hero-channels .section-title {
    font-size: 18px;
  }

  .playlist-body {
    padding: 20px 16px;
  }

  .playlist-order {
    padding: 12px;
  }

  .checklist-item {
    padding: 16px;
  }

  .issue-question {
    padding: 14px 16px;
    font-size: 14px;
  }

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

  .faq-item p {
    padding: 0 16px 14px;
    font-size: 13px;
  }

  .step-item {
    padding: 20px 16px;
  }

  .footer-inner {
    gap: 24px;
  }
}