/* ==========================================================
   天美影视 - 整站样式表
   版本: 1.0
   说明: 覆盖首页、频道目录、专题片单、观看指南、问题反馈、404页
   ========================================================== */

/* ==========================================================
   1. Base - 基础变量、重置、字体、通用元素
   ========================================================== */
:root {
  --color-primary: #1a1a2e;
  --color-accent: #e94560;
  --color-bg: #f5f5f7;
  --color-text: #2d2d44;
  --color-card: #ffffff;
  --color-border: #e4e4ea;
  --color-muted: #7a7a8c;
  --color-muted-light: #a0a0b0;
  --color-light-line: #eef0f4;

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

  --container-width: 1200px;
  --container-padding: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;

  --header-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  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 {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

figure {
  margin: 0;
}

.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;
}

/* ==========================================================
   2. Layout - 整体布局、容器、页头、页脚
   ========================================================== */

/* 站点主体 */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* 统一容器 */
.header-inner,
.footer-inner,
.home-main > section,
.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ==========================================================
   2.1 页头
   ========================================================== */
.site-header {
  background-color: var(--color-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  position: relative;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0;
}

.logo-slogan {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-list li a:hover {
  color: #ffffff;
  border-bottom-color: rgba(255, 255, 255, 0.4);
}

.nav-list li a.is-current {
  color: #ffffff;
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ==========================================================
   2.2 页脚
   ========================================================== */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-xl);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 16px;
}

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

.footer-links li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer-links li a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================
   2.3 内页统一骨架
   ========================================================== */
.inner-main {
  padding-top: var(--space-md);
  padding-bottom: var(--space-xl);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
  padding: 0;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  letter-spacing: 0;
}

.page-description {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 720px;
  line-height: 1.7;
  margin-bottom: 0;
}

/* 区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0;
}

.section-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 720px;
}

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

/* 3.1 通用卡片 */
.channel-card,
.playlist-card,
.category-card,
.entry-card,
.related-card,
.faq-summary-item,
.example-item {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.channel-card:hover,
.playlist-card:hover,
.entry-card:hover,
.related-card:hover {
  box-shadow: 0 6px 20px rgba(26, 26, 46, 0.08);
  transform: translateY(-2px);
}

/* 3.2 图片容器 */
.card-figure,
.card-media {
  position: relative;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-light-line);
}

.card-figure img,
.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

/* 3.3 标签 */
.tag,
.card-tag,
.card-tags {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(233, 69, 96, 0.08);
  padding: 3px 10px;
  border-radius: 999px;
  margin-right: 6px;
  margin-bottom: 4px;
  letter-spacing: 0;
}

/* 3.4 步骤 */
.path-step,
.process-step,
.step-item {
  position: relative;
}

.step-number,
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

/* 3.5 标签列表 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list li a {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.tag-list li a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

/* 3.6 入口卡片 */
.entry-card,
.related-card {
  display: block;
  padding: 20px 24px;
  background-color: var(--color-card);
}

.entry-title,
.related-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

/* ==========================================================
   4. Pages - 首页
   ========================================================== */

/* 4.1 首屏工作台 */
.workbench {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: var(--color-primary);
}

.workbench-media {
  display: flex;
  align-items: stretch;
}

.hero-figure {
  width: 100%;
  height: 100%;
  min-height: 280px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #2d2d44;
}

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

.workbench-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
}

.workbench-title {
  font-size: 30px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
  letter-spacing: 0;
}

.workbench-desc {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 工作台面板 */
.task-panel,
.benefit-panel,
.recent-panel {
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.panel-title {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.task-list li,
.benefit-list li {
  padding: 6px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.task-link {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
}

.task-link:hover {
  color: #ffffff;
}

.task-tag {
  font-size: 12px;
  color: var(--color-accent);
  background-color: rgba(233, 69, 96, 0.15);
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}

.task-text {
  flex: 1;
}

.benefit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background-color: rgba(233, 69, 96, 0.2);
  color: var(--color-accent);
  border-radius: 4px;
  font-size: 12px;
  flex-shrink: 0;
}

/* 最近记录 */
.recent-list li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.recent-list li:last-child {
  border-bottom: none;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.recent-thumb {
  width: 56px;
  height: 40px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background-color: #2d2d44;
}

.recent-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.recent-name {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recent-channel {
  display: block;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 2px;
}

.recent-time {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  flex-shrink: 0;
}

/* 4.2 题材标签索引条 */
.tag-strip {
  padding: 32px 0;
  background-color: var(--color-bg);
}

.tag-strip-header {
  margin-bottom: 16px;
}

.tag-strip .section-title {
  margin-bottom: 4px;
}

.tag-strip .section-desc {
  margin-bottom: 0;
}

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

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

.tag-item a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

/* 4.3 频道速览 */
.channel-preview {
  padding: 48px 0;
  background-color: var(--color-bg);
}

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

.section-head .section-title {
  margin-bottom: 4px;
}

.section-more {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  white-space: nowrap;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.section-more:hover {
  border-bottom-color: var(--color-accent);
}

/* 频道网格 - 首页4列 */
.channel-preview .channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* 频道卡片 */
.channel-preview .channel-card {
  display: flex;
  flex-direction: column;
}

.channel-preview .card-figure {
  aspect-ratio: 16 / 9;
}

.channel-preview .card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.channel-preview .card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.channel-preview .card-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
}

/* 4.4 专题片单预览 */
.playlist-preview {
  padding: 48px 0;
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.playlist-preview .playlist-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
}

.playlist-preview .card-figure {
  aspect-ratio: 16 / 9;
}

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

.playlist-preview .card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.playlist-preview .card-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
}

/* 4.5 观看指南路径 */
.guide-path {
  padding: 48px 0;
  background-color: var(--color-bg);
}

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

.guide-path .path-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-path .step-number {
  margin-bottom: 8px;
}

.guide-path .step-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.step-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

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

/* 4.6 更新动态 */
.update-list {
  padding: 48px 0;
  background-color: var(--color-card);
}

.update-items {
  margin-top: 24px;
}

.update-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.update-item:last-child {
  border-bottom: none;
}

.update-date {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 88px;
}

.update-text {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
}

/* ==========================================================
   5. Pages - 频道目录页
   ========================================================== */

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

/* 频道网格 - 内页8列 */
.channel-grid-section .channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.channel-grid-section .channel-card {
  display: flex;
  flex-direction: column;
}

.channel-grid-section .card-media {
  aspect-ratio: 16 / 9;
}

.channel-grid-section .card-content {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.channel-grid-section .card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.channel-grid-section .card-tags {
  margin-bottom: 8px;
}

.channel-grid-section .card-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 题材标签说明 */
.tag-explanation {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.tag-explanation-content p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.tag-explanation-content p:last-of-type {
  margin-bottom: 16px;
}

.tag-explanation .tag-list {
  margin-top: 8px;
}

/* 内容示例 */
.example-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.example-item {
  padding: 20px;
}

.example-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.example-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.example-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 相关入口 */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ==========================================================
   6. Pages - 专题片单页
   ========================================================== */

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

/* 片单卡片区 */
.playlist-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.playlist-cards .card-media {
  aspect-ratio: 16 / 9;
}

.playlist-cards .card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.playlist-cards .card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.playlist-cards .card-tags {
  margin-bottom: 10px;
}

.playlist-cards .card-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 12px;
  flex: 1;
}

.playlist-cards .card-scene {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 0;
}

.playlist-cards .card-scene strong {
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 4px;
}

/* 编辑推荐 */
.editor-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.editor-lead {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.reason-item {
  padding: 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.reason-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

/* 题材标签索引 */
.tag-index-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

/* 相关入口 */
.related-entry .entry-grid {
  grid-template-columns: 1fr 1fr;
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: 24px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-accent);
  padding: 4px 12px;
  border: 1px solid rgba(233, 69, 96, 0.3);
  border-radius: 999px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-links-item:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* ==========================================================
   7. Pages - 观看指南页
   ========================================================== */

/* 步骤时间线 */
.guide-steps {
  margin-bottom: 48px;
}

.steps-timeline {
  position: relative;
  margin-top: 24px;
}

.steps-timeline .step-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.steps-timeline .step-item:last-child {
  border-bottom: none;
}

.steps-timeline .step-number {
  width: 40px;
  height: 40px;
  font-size: 16px;
}

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

.step-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.step-content p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 0;
  max-width: 720px;
}

/* 指南配图 */
.guide-media {
  margin-bottom: 48px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-light-line);
}

.guide-media img {
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
}

.guide-media figcaption {
  padding: 12px 20px;
  font-size: 14px;
  color: var(--color-muted);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
}

/* 核验清单 */
.verify-checklist {
  margin-bottom: 48px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

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

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.check-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: 4px;
  font-size: 14px;
  flex-shrink: 0;
}

.check-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.check-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

/* 设备与网络 */
.device-network {
  margin-bottom: 48px;
}

.two-col-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

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

.info-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.info-block p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

/* FAQ 摘要 */
.guide-faq {
  margin-bottom: 48px;
}

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

.faq-summary-item {
  padding: 20px;
}

.faq-summary-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.faq-entry-link {
  margin-top: 24px;
  text-align: center;
}

.faq-entry-link p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 0;
}

.faq-entry-link a {
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.faq-entry-link a:hover {
  border-bottom-color: var(--color-accent);
}

/* 相关入口 */
.related-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-row .related-card {
  padding: 20px;
}

/* ==========================================================
   8. Pages - 问题反馈页
   ========================================================== */

/* 问题分类 */
.feedback-categories {
  margin-bottom: 48px;
}

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

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

.category-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.category-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
  flex: 1;
}

.category-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  align-self: flex-start;
}

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

/* 排查路径 */
.troubleshoot-path {
  margin-bottom: 48px;
}

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

.troubleshoot-path .path-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.troubleshoot-path .step-num {
  margin-bottom: 8px;
}

.troubleshoot-path .step-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.troubleshoot-path .step-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* FAQ 列表 */
.faq-section {
  margin-bottom: 48px;
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition-fast);
}

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

.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;
  font-weight: 400;
  color: var(--color-muted);
  transition: transform var(--transition-fast);
}

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

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

/* 处理流程 */
.process-flow {
  margin-bottom: 48px;
}

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

.process-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.process-step .step-num {
  margin-bottom: 8px;
}

.process-step .step-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.process-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-light-line);
}

.process-media img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
}

.process-media figcaption {
  padding: 10px 20px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
}

/* 相关入口 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ==========================================================
   9. Pages - 404
   ========================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 24px;
}

.error-box {
  text-align: center;
  max-width: 480px;
  padding: 48px 40px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.error-box h1 {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: 0;
}

.error-box p {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.error-back {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: #ffffff;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.error-back:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* ==========================================================
   10. Responsive - 响应式
   ========================================================== */

/* 桌面端隐藏汉堡按钮 */
@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: flex;
  }

  .nav-list {
    display: flex;
  }
}

/* 平板及以下 */
@media (max-width: 1024px) {
  :root {
    --container-padding: 20px;
  }

  /* 首页频道速览 4列 -> 2列 */
  .channel-preview .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 内页频道网格 4列 -> 2列 */
  .channel-grid-section .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-brand {
    grid-column: span 3;
    max-width: 100%;
  }
}

/* 手机端 */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --header-height: 56px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  /* 页头 */
  .header-inner {
    height: var(--header-height);
  }

  .logo-slogan {
    font-size: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: block;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .site-nav.is-open {
    max-height: 320px;
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 0;
  }

  .nav-list li a {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-left: 2px solid transparent;
  }

  .nav-list li a.is-current {
    border-left-color: var(--color-accent);
    border-bottom-color: rgba(255, 255, 255, 0.06);
  }

  /* 首页工作台 */
  .workbench {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .workbench-media {
    order: 1;
  }

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

  .workbench-content {
    order: 2;
    gap: 16px;
  }

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

  .task-panel,
  .benefit-panel,
  .recent-panel {
    padding: 14px 16px;
  }

  /* 首页频道速览 */
  .channel-preview .channel-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .channel-preview .channel-card {
    flex-direction: row;
    align-items: stretch;
  }

  .channel-preview .card-figure {
    width: 120px;
    aspect-ratio: 1;
    flex-shrink: 0;
  }

  .channel-preview .card-body {
    padding: 12px 16px;
  }

  /* 首页专题片单 */
  .playlist-preview .playlist-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .playlist-preview .playlist-card {
    flex-direction: row;
    align-items: stretch;
  }

  .playlist-preview .card-figure {
    width: 120px;
    aspect-ratio: 1;
    flex-shrink: 0;
  }

  .playlist-preview .card-body {
    padding: 12px 16px;
  }

  /* 首页指南路径 */
  .path-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .guide-path .path-step {
    padding: 20px;
  }

  /* 首页更新 */
  .update-item {
    flex-direction: column;
    gap: 4px;
    padding: 12px 0;
  }

  /* 内页 */
  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

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

  .section-block,
  .section-wrap {
    margin-bottom: 32px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  /* 内页频道网格 */
  .channel-grid-section .channel-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .channel-grid-section .channel-card {
    flex-direction: row;
    align-items: stretch;
  }

  .channel-grid-section .card-media {
    width: 120px;
    aspect-ratio: 1;
    flex-shrink: 0;
  }

  .channel-grid-section .card-content {
    padding: 12px 16px;
  }

  /* 内容示例 */
  .example-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 专题片单 */
  .playlist-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .playlist-cards .playlist-card {
    flex-direction: row;
    align-items: stretch;
  }

  .playlist-cards .card-media {
    width: 120px;
    aspect-ratio: 1;
    flex-shrink: 0;
  }

  .playlist-cards .card-body {
    padding: 12px 16px;
  }

  .reason-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 观看指南 */
  .steps-timeline .step-item {
    padding: 16px 0;
    gap: 14px;
  }

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

  .step-content h3 {
    font-size: 16px;
  }

  .step-content p {
    font-size: 14px;
  }

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

  .two-col-info {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .faq-summary-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 问题反馈 */
  .category-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  /* 相关入口 */
  .entry-grid,
  .related-grid,
  .related-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .footer-brand {
    grid-column: span 2;
  }

  .footer-col {
    grid-column: span 1;
  }

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

  /* 404 */
  .error-box {
    padding: 32px 24px;
  }

  .error-box h1 {
    font-size: 56px;
  }
}

/* 小屏手机 */
@media (max-width: 390px) {
  .logo-slogan {
    font-size: 15px;
  }

  .workbench-title {
    font-size: 22px;
  }

  .channel-preview .channel-card,
  .playlist-preview .playlist-card,
  .channel-grid-section .channel-card,
  .playlist-cards .playlist-card {
    flex-direction: column;
  }

  .channel-preview .card-figure,
  .playlist-preview .card-figure,
  .channel-grid-section .card-media,
  .playlist-cards .card-media {
    width: 100%;
    aspect-ratio: 16 / 9;
  }

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

  .footer-brand {
    grid-column: span 1;
  }
}

/* ==========================================================
   11. Animation - 滚动出现动画（不影响初始可见性）
   ========================================================== */
@media (prefers-reduced-motion: no-preference) {
  .channel-preview .channel-card,
  .playlist-preview .playlist-card,
  .guide-path .path-step,
  .update-item,
  .section-block .channel-card,
  .playlist-cards .playlist-card,
  .steps-timeline .step-item,
  .category-card,
  .process-step {
    animation: fadeInUp 0.5s ease both;
  }

  .channel-preview .channel-card:nth-child(2),
  .playlist-preview .playlist-card:nth-child(2),
  .channel-grid-section .channel-card:nth-child(2),
  .playlist-cards .playlist-card:nth-child(2) {
    animation-delay: 0.05s;
  }

  .channel-preview .channel-card:nth-child(3),
  .playlist-preview .playlist-card:nth-child(3),
  .channel-grid-section .channel-card:nth-child(3),
  .playlist-cards .playlist-card:nth-child(3) {
    animation-delay: 0.1s;
  }

  .channel-preview .channel-card:nth-child(4),
  .channel-grid-section .channel-card:nth-child(4) {
    animation-delay: 0.15s;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}