/* ============================================================
   红桃视频 · 全站样式表
   媒体编辑目录风 · 暖灰纸感 · 红砖强调
   ============================================================ */

/* ============================================================
   1. BASE — 基础变量、重置、字体
   ============================================================ */
:root {
  --color-primary: #C0392B;
  --color-primary-dark: #A93226;
  --color-bg: #F5F2EE;
  --color-bg-card: #FFFFFF;
  --color-bg-soft: #FBF9F7;
  --color-text: #22252A;
  --color-text-secondary: #72777D;
  --color-success: #2D7D6B;
  --color-border: #E3DDD6;
  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-width: 1200px;
  --container-padding: 24px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 3px rgba(34, 37, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(34, 37, 42, 0.08);
  --shadow-hover: 0 8px 24px rgba(34, 37, 42, 0.12);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 19px;
}

p {
  margin-bottom: 0;
}

figure {
  margin: 0;
}

table {
  border-collapse: collapse;
  width: 100%;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

/* 跳转链接（键盘可达） */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* 视觉隐藏（保留给屏幕阅读器） */
.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;
}

/* ============================================================
   2. LAYOUT — 外壳骨架、容器、页头、页脚
   ============================================================ */

/* 站点外壳：统一容器宽度 */
.site-header,
.site-footer,
.site-main {
  width: 100%;
}

.header-inner,
.footer-inner,
.site-main .layout-shell,
.site-main > section,
.site-main > div,
.site-main > article,
.site-main > aside {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* 首页与内页主容器：与外壳保持同宽 */
.site-main.home-main > section,
.site-main.inner-main > section,
.site-main.inner-main > div,
.site-main.inner-main > article,
.site-main.inner-main > aside {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* 页头 —— 全站统一 */
.site-header {
  background-color: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}

/* 品牌区 */
.brand-area {
  flex-shrink: 0;
}

.brand-link {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}

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

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

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

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

.nav-list li {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 700;
  background-color: rgba(192, 57, 43, 0.08);
}

/* 汉堡按钮 —— 默认隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-height: 44px;
  min-width: 44px;
  background-color: var(--color-bg-card);
}

.nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
}

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

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

.nav-toggle-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

/* 页脚 —— 全站统一 */
.site-footer {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 40px;
}

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

.footer-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

.footer-link {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-dyn-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  border-bottom: 1px dashed var(--color-border);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  padding-bottom: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

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

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

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

/* 页面标题区 */
.page-header {
  padding-top: 16px;
  padding-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.8;
}

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

.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

/* 通用卡片 */
.featured-card,
.topic-card,
.channel-card,
.guide-card,
.directory-card,
.result-card,
.scene-item,
.method-item,
.save-method,
.prep-faq-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.featured-card:hover,
.topic-card:hover,
.channel-card:hover,
.guide-card:hover,
.directory-card:hover,
.result-card:hover,
.scene-item:hover,
.method-item:hover,
.save-method:hover,
.prep-faq-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

/* 图片容器统一约束 */
.card-media,
.topic-card-media,
.scene-media,
.prep-figure,
.verify-media,
.positioning-figure,
.faq-media {
  overflow: hidden;
  background-color: var(--color-bg-soft);
}

.card-media img,
.topic-card-media img,
.scene-media img,
.prep-figure img,
.verify-media img,
.positioning-figure img,
.faq-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ============================================================
   4. PAGES — 首页模块
   ============================================================ */

/* 品牌摘要条 */
.brand-summary {
  padding-top: 32px;
  padding-bottom: 24px;
}

.summary-text {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.8;
}

.summary-entry {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: background-color var(--transition-fast);
}

.summary-entry:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

/* 首屏双栏：内容地图 + 快速索引 */
.content-map {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  padding-top: 8px;
  padding-bottom: 48px;
}

.map-column,
.index-column {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.map-column .section-title,
.index-column .section-title {
  font-size: 20px;
  margin-bottom: 6px;
}

.map-column .section-desc,
.index-column .section-desc {
  font-size: 14px;
  margin-bottom: 16px;
}

.map-tree {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.map-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-soft);
  transition: background-color var(--transition-fast);
}

.map-item:hover {
  background-color: rgba(192, 57, 43, 0.06);
}

.map-link {
  display: inline-block;
  font-weight: 600;
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 2px;
}

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

.quick-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.quick-link {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-soft);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.quick-link:hover {
  background-color: rgba(192, 57, 43, 0.06);
  color: var(--color-primary);
}

.dynamic-note {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.note-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

.note-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 4px 0;
  position: relative;
  padding-left: 16px;
}

.note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

/* 重点专题大卡 */
.featured-topic {
  padding-top: 8px;
  padding-bottom: 48px;
}

.featured-topic .featured-card {
  overflow: hidden;
}

.featured-topic .main-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  grid-column: span 2;
}

.featured-topic .main-card .card-media {
  height: 100%;
  min-height: 260px;
}

.featured-topic .main-card .card-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-topic .main-card .card-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 12px;
}

.featured-topic .main-card .card-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.featured-topic .main-card .card-link,
.featured-topic .side-card .card-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  align-self: flex-start;
  transition: background-color var(--transition-fast);
}

.featured-topic .main-card .card-link:hover,
.featured-topic .side-card .card-link:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

.featured-topic .side-card {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  overflow: hidden;
}

.featured-topic .side-card .card-media {
  height: 100%;
  min-height: 160px;
}

.featured-topic .side-card .card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-topic .side-card .card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.featured-topic .side-card .card-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

/* 频道速览 */
.channel-list {
  padding-bottom: 48px;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.channel-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.channel-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 8px;
  flex-grow: 1;
}

.channel-scene {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.channel-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-block;
}

/* 观看路径 */
.watch-path {
  padding-bottom: 48px;
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.path-step {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

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

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

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

.path-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.path-link {
  display: inline-block;
  padding: 10px 24px;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.path-link:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* 动态与边界 */
.dynamics-boundary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding-bottom: 48px;
}

.dynamics-column,
.boundary-column {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.dynamics-list li {
  padding: 12px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

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

.boundary-list li {
  padding: 8px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-success);
}

.boundary-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================================
   5. PAGES — 内页共用模块
   ============================================================ */

/* 返回目录块（所有内页统一） */
.back-to-index {
  padding-top: 16px;
  padding-bottom: 48px;
}

.back-block,
.back-to-index-inner,
.back-to-index-content {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
}

.back-block p,
.back-to-index-text,
.back-desc,
.back-note {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.back-link,
.back-to-index-link {
  display: inline-block;
  padding: 10px 28px;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: background-color var(--transition-fast);
}

.back-link:hover,
.back-to-index-link:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

.back-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.back-separator {
  color: var(--color-border);
}

/* 相关链接（内页通用） */
.related-links {
  padding-bottom: 32px;
}

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

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

.related-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.related-link {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-primary);
  display: inline-block;
  margin-bottom: 4px;
}

.related-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   6. PAGES — 场景导航页
   ============================================================ */

.scene-cards {
  padding-bottom: 48px;
}

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

.scene-item {
  display: grid;
  grid-template-columns: 56px 1.4fr 1fr;
  gap: 24px;
  padding: 24px;
  overflow: hidden;
}

.scene-number {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  padding-top: 4px;
}

.scene-content {
  display: flex;
  flex-direction: column;
}

.scene-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.scene-audience {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.scene-entry {
  font-size: 14px;
  margin-bottom: 12px;
}

.scene-entry a {
  font-weight: 600;
}

.scene-steps p {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 6px;
  font-weight: 600;
}

.scene-steps ol {
  list-style: decimal;
  padding-left: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.scene-steps ol li {
  margin-bottom: 4px;
  line-height: 1.6;
}

.scene-media {
  border-radius: var(--radius-md);
  min-height: 140px;
}

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

/* 场景到频道映射表 */
.relation-map {
  padding-bottom: 48px;
}

.table-wrap {
  overflow-x: auto;
}

.map-table {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.map-table th,
.map-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.map-table th {
  background-color: var(--color-bg-soft);
  font-weight: 700;
  color: var(--color-text);
}

.map-table td {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.map-table tr:last-child td {
  border-bottom: none;
}

/* 推荐专题卡 */
.related-topics {
  padding-bottom: 48px;
}

.topic-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.topic-card {
  overflow: hidden;
}

.topic-card-media {
  min-height: 160px;
}

.topic-card-content {
  padding: 20px 24px;
}

.topic-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================================
   7. PAGES — 专题精选页
   ============================================================ */

/* 主打专题大卡 */
.curated-page .featured-topic {
  padding-bottom: 48px;
}

.featured-topic-card {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 0;
  overflow: hidden;
}

.featured-topic-card .topic-card-media {
  min-height: 280px;
}

.featured-topic-card .topic-card-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-card-name {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
}

.topic-card-points,
.topic-card-audience {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.btn-topic-entry {
  display: inline-block;
  padding: 10px 28px;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  align-self: flex-start;
  transition: background-color var(--transition-fast);
}

.btn-topic-entry:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

/* 专题网格 */
.curated-list {
  padding-bottom: 48px;
}

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

.curated-grid .topic-card {
  overflow: hidden;
}

.curated-grid .topic-card-media {
  min-height: 140px;
}

.curated-grid .topic-card-body {
  padding: 20px 24px;
}

.curated-grid .topic-card-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.topic-card-direction,
.topic-card-scene {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}

.topic-card-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 8px;
}

/* 挑选方法 */
.how-to-choose {
  padding-bottom: 48px;
}

.choose-methods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.method-item {
  padding: 24px;
}

.method-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.method-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.method-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* 关联频道 */
.related-channels {
  padding-bottom: 48px;
}

.channel-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.channel-cards .channel-card {
  padding: 24px;
}

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

.channel-card-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.channel-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
  flex-grow: 1;
}

.channel-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================================
   8. PAGES — 观看准备页
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

.layout-main {
  min-width: 0;
}

/* 准备清单 */
.prep-list {
  padding-bottom: 48px;
}

.prep-figure {
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  min-height: 200px;
}

.prep-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.prep-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.prep-item-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.prep-item-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 6px;
}

.prep-item-action {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.prep-item-action::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* 常见准备问题 */
.common-prep {
  padding-bottom: 48px;
}

.prep-faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.prep-faq-item {
  padding: 20px 24px;
}

.prep-faq-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.prep-faq-body {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 入口保存建议 */
.entry-save {
  padding-bottom: 48px;
}

.save-methods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.save-method {
  padding: 24px;
}

.save-method-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.save-method-body {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 侧栏 */
.prepare-sidebar {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.prepare-sidebar .section-title {
  font-size: 18px;
}

/* ============================================================
   9. PAGES — 访问核验页
   ============================================================ */

.verify-steps {
  padding-bottom: 48px;
}

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

.step-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

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

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

.step-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 8px;
}

.step-tip {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding: 10px 12px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
}

.verify-media {
  border-radius: var(--radius-md);
  min-height: 180px;
}

.verify-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
}

/* 核验记录表 */
.record-table {
  padding-bottom: 48px;
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.table-wrapper table {
  min-width: 640px;
}

.table-wrapper th,
.table-wrapper td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.table-wrapper th {
  background-color: var(--color-bg-soft);
  font-weight: 700;
  color: var(--color-text);
}

.table-wrapper td {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.table-wrapper tr:last-child td {
  border-bottom: none;
}

/* 结果处理 */
.result-handling {
  padding-bottom: 48px;
}

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

.result-card {
  padding: 24px;
  border-top: 3px solid var(--color-border);
}

.result-ok {
  border-top-color: var(--color-success);
}

.result-retry {
  border-top-color: #E67E22;
}

.result-fail {
  border-top-color: var(--color-primary);
}

.result-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.result-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 8px;
}

.result-next {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding: 10px 12px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
}

/* ============================================================
   10. PAGES — 常见疑问页
   ============================================================ */

.faq-section {
  padding-bottom: 48px;
}

.faq-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

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

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  padding-right: 44px;
  list-style: none;
}

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

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

.faq-answer {
  padding: 16px 20px;
}

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

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer strong {
  color: var(--color-text);
  font-weight: 600;
}

.faq-media {
  border-radius: var(--radius-md);
  min-height: 160px;
}

.faq-media figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
}

/* 相关指南 */
.related-guides {
  padding-bottom: 48px;
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.guide-card {
  padding: 24px;
  display: block;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.guide-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.guide-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   11. PAGES — 内容边界页
   ============================================================ */

.positioning-section,
.boundary-list-section,
.info-method-section,
.feedback-note-section,
.related-directory-section {
  padding-bottom: 48px;
}

.section-heading {
  margin-bottom: 16px;
}

.positioning-layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 32px;
  align-items: center;
}

.positioning-text p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

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

.positioning-figure {
  border-radius: var(--radius-md);
  min-height: 200px;
}

.figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
}

/* 提供与不提供对比表 */
.boundary-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.boundary-table {
  min-width: 640px;
}

.boundary-table th,
.boundary-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  vertical-align: top;
}

.boundary-table th {
  background-color: var(--color-bg-soft);
  font-weight: 700;
  color: var(--color-text);
}

.boundary-table td {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.boundary-table td:first-child {
  color: var(--color-text);
  font-weight: 500;
}

.boundary-table tr:last-child td {
  border-bottom: none;
}

.table-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 12px;
  line-height: 1.6;
}

/* 信息整理方式 */
.method-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.method-item {
  padding: 24px;
}

.method-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.method-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.method-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-top: 24px;
  padding: 16px 20px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

/* 反馈说明 */
.feedback-content {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.feedback-content p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.feedback-content p:last-child {
  margin-bottom: 0;
}

/* 相关目录卡 */
.directory-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.directory-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.directory-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.directory-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   12. PAGES — 404 页面
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 68px - 320px);
  padding: 48px 24px;
}

.error-panel {
  text-align: center;
  max-width: 560px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-size: 64px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-home-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: background-color var(--transition-fast);
}

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

.error-help {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 16px;
}

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

/* 平板及以下：1200px */
@media (max-width: 1200px) {
  .channel-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

/* 小屏：768px */
@media (max-width: 768px) {
  .header-inner {
    min-height: 60px;
    flex-wrap: wrap;
  }

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

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px;
    gap: 0;
    z-index: 99;
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-link {
    padding: 14px 8px;
    font-size: 16px;
    border-radius: 0;
  }

  .brand-tagline {
    display: none;
  }

  /* 首页模块 */
  .content-map {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .map-column {
    order: 2;
  }

  .index-column {
    order: 1;
  }

  .featured-topic .main-card {
    grid-template-columns: 1fr;
  }

  .featured-topic .side-card {
    grid-template-columns: 1fr;
  }

  .featured-topic .main-card .card-media,
  .featured-topic .side-card .card-media {
    min-height: 180px;
  }

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

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

  .dynamics-boundary {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 内页 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .prepare-sidebar {
    order: -1;
  }

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

  .faq-media {
    display: none;
  }

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

  .scene-number {
    justify-content: flex-start;
  }

  .scene-media {
    min-height: 120px;
  }

  .topic-cards,
  .channel-cards,
  .choose-methods,
  .save-methods,
  .guides-grid,
  .directory-cards {
    grid-template-columns: 1fr;
  }

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

  .featured-topic-card {
    grid-template-columns: 1fr;
  }

  .featured-topic-card .topic-card-media {
    min-height: 200px;
  }

  .steps-grid,
  .result-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 36px;
    padding-bottom: 28px;
  }

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

  .page-header {
    padding-top: 8px;
    padding-bottom: 24px;
  }

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

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

/* 手机：480px */
@media (max-width: 480px) {
  :root {
    --container-padding: 16px;
  }

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

  .nav-toggle-text {
    display: none;
  }

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

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

  .map-column,
  .index-column,
  .dynamics-column,
  .boundary-column {
    padding: 20px;
  }

  .featured-topic .main-card .card-body,
  .featured-topic .side-card .card-body,
  .featured-topic-card .topic-card-body {
    padding: 20px;
  }

  .featured-topic .main-card .card-title {
    font-size: 22px;
  }

  .scene-item,
  .method-item,
  .save-method,
  .result-card,
  .guide-card,
  .directory-card {
    padding: 20px;
  }

  .back-block,
  .back-to-index-inner,
  .back-to-index-content {
    padding: 20px;
  }

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

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

  .table-wrapper,
  .boundary-table-wrap {
    margin: 0 -4px;
    padding: 0 4px;
  }

  .brand-summary {
    padding-top: 24px;
  }

  .summary-text {
    font-size: 16px;
  }

  .summary-entry {
    width: 100%;
    text-align: center;
  }
}

/* ============================================================
   14. 动效 — 滚动渐入（不影响初始可见性）
   ============================================================ */

.fade-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}