/* ============================================================
   糖心vlog · 全站样式表
   瑞士网格风：严格对齐、无衬线、信息编号、留白准确
   ============================================================ */

/* ============================================================
   Base —— 全局基础
   ============================================================ */
*,
*::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: 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #1a1a1a;
  background-color: #f5f5f5;
}

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

a {
  color: #2b6cb0;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #1a4a7a;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

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

/* ============================================================
   Layout —— 全站骨架
   ============================================================ */

/* 站点根容器 */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 全站页头 */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.logo-mark {
  display: inline-block;
  width: 28px;
  height: 28px;
  background-color: #2b6cb0;
  border-radius: 4px;
  position: relative;
  flex-shrink: 0;
}

.logo-mark::after {
  content: '';
  position: absolute;
  top: 7px;
  left: 7px;
  width: 14px;
  height: 14px;
  background-color: #ffffff;
  border-radius: 2px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1a1a1a;
  letter-spacing: 0;
}

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

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 20px 16px;
  font-size: 0.9375rem;
  color: #4a5568;
  line-height: 1.4;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 0;
  height: 2px;
  background-color: #2b6cb0;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.nav-link:hover {
  color: #1a1a1a;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-item.is-current .nav-link {
  color: #1a1a1a;
  font-weight: 600;
}

.nav-item.is-current .nav-link::after {
  transform: scaleX(1);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #1a1a1a;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* 全站主内容 */
.site-main {
  flex: 1 0 auto;
}

/* 首页主内容 */
.home-main {
  width: 100%;
}

/* 内页主内容 */
.inner-main {
  width: 100%;
}

/* 全站页脚 */
.site-footer {
  background-color: #1a1a1a;
  color: #cbd5e0;
  margin-top: 64px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
}

.footer-col h3 {
  font-size: 0.9375rem;
  color: #ffffff;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-logo {
  font-size: 1.375rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #a0aec0;
}

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

.footer-links a {
  font-size: 0.875rem;
  color: #a0aec0;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.copyright {
  font-size: 0.8125rem;
  color: #718096;
  margin: 0;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: #718096;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: #2b6cb0;
}

.breadcrumb a:hover {
  color: #1a4a7a;
}

.breadcrumb-sep {
  color: #a0aec0;
}

.breadcrumb-current {
  color: #4a5568;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid #e2e8f0;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1rem;
  color: #4a5568;
  max-width: 640px;
  line-height: 1.7;
}

/* 区块标题 */
.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.section-desc,
.section-lead,
.section-intro {
  font-size: 0.9375rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 16px;
}

/* 侧栏 */
.sidebar {
  min-width: 0;
}

.sidebar-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #1a1a1a;
  padding-bottom: 12px;
  border-bottom: 1px solid #e2e8f0;
  margin-bottom: 16px;
}

.sidebar-list li {
  margin-bottom: 2px;
}

.sidebar-list a {
  display: block;
  padding: 8px 0;
  font-size: 0.875rem;
  color: #4a5568;
  border-bottom: 1px solid #f0f0f0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.sidebar-list a:hover {
  color: #2b6cb0;
  padding-left: 6px;
}

/* FAQ 折叠项 */
.faq-item {
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background-color: #ffffff;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #1a1a1a;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: #f7fafc;
}

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: #2b6cb0;
  font-weight: 400;
  transition: transform 0.25s ease;
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: #4a5568;
}

/* 内容图片 */
.content-media {
  margin-bottom: 24px;
}

.content-media img {
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.content-media figcaption {
  font-size: 0.8125rem;
  color: #718096;
  margin-top: 8px;
}

.content-media-inline {
  margin: 24px 0;
}

/* ============================================================
   Pages —— 页面级样式
   ============================================================ */

/* ===== 首页 ===== */

/* Hero 焦点区 */
.hero-section {
  background-color: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  padding: 64px 0 72px;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 16px;
  line-height: 1.25;
}

.hero-subtitle {
  font-size: 1.0625rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 440px;
}

.hero-cta {
  display: inline-block;
  background-color: #2b6cb0;
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.hero-cta:hover {
  background-color: #1a4a7a;
  color: #ffffff;
}

.hero-media {
  margin: 0;
}

.hero-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: 8px;
}

/* 通用区块 */
.section-block {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 24px;
}

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

.section-heading .section-title {
  font-size: 1.625rem;
}

.section-heading .section-desc {
  max-width: 560px;
  margin-bottom: 0;
}

.section-more-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #2b6cb0;
  margin-top: 24px;
}

.section-more-link:hover {
  color: #1a4a7a;
  text-decoration: underline;
}

/* 频道标签卡片 */
.channels-overview {
  background-color: #f5f5f5;
}

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

.channel-tag-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 24px 20px;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.channel-tag-card:hover {
  border-color: #2b6cb0;
  box-shadow: 0 4px 16px rgba(43, 108, 176, 0.08);
}

.channel-tag-icon {
  display: block;
  width: 40px;
  height: 40px;
  background-color: #ebf4ff;
  border-radius: 6px;
  margin-bottom: 14px;
  position: relative;
}

.channel-tag-icon::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 10px;
  width: 20px;
  height: 20px;
  border: 2px solid #2b6cb0;
  border-radius: 4px;
}

.channel-tag-name {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 6px;
}

.channel-tag-desc {
  display: block;
  font-size: 0.8125rem;
  color: #718096;
  line-height: 1.6;
}

/* 专题推荐 */
.topics-preview {
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
}

.topics-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: stretch;
}

/* 主推荐大卡 */
.topic-featured-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.topic-featured-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.topic-featured-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.topic-featured-info {
  padding: 24px;
}

.topic-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #2b6cb0;
  background-color: #ebf4ff;
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 12px;
}

.topic-featured-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 10px;
}

.topic-featured-desc {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 0;
}

/* 次推荐小卡 */
.topic-sub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.topic-sub-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.topic-sub-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.topic-sub-card img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.topic-sub-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #1a1a1a;
  padding: 12px 14px 4px;
}

.topic-sub-desc {
  display: block;
  font-size: 0.8125rem;
  color: #718096;
  line-height: 1.5;
  padding: 0 14px 14px;
}

/* 最新动态 */
.latest-updates {
  background-color: #f5f5f5;
}

.updates-list {
  counter-reset: update-counter;
}

.update-item {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 16px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid #e2e8f0;
}

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

.update-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: #cbd5e0;
  line-height: 1.2;
}

.update-content {
  min-width: 0;
}

.update-title {
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 6px;
}

.update-desc {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.6;
}

.update-date {
  font-size: 0.8125rem;
  color: #a0aec0;
  white-space: nowrap;
  padding-top: 4px;
}

/* 观看指南入口 */
.guide-entry {
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.guide-entry-text .section-title {
  font-size: 1.625rem;
  margin-bottom: 12px;
}

.guide-entry-text .section-desc {
  margin-bottom: 0;
}

.guide-entry-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guide-entry-link {
  display: block;
  background-color: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #2b6cb0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.guide-entry-link:hover {
  background-color: #ebf4ff;
  border-color: #2b6cb0;
  color: #1a4a7a;
}

/* 相关链接 */
.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
}

.related-links-item {
  font-size: 0.875rem;
  color: #2b6cb0;
}

.related-links-item:hover {
  text-decoration: underline;
}

/* ===== 内页通用布局 ===== */

.page-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 48px;
  align-items: start;
}

.main-content {
  min-width: 0;
  max-width: 100%;
}

/* ===== 频道分类页 ===== */

.channel-overview {
  margin-bottom: 40px;
}

.channel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.channel-card {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.channel-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.channel-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.channel-body {
  padding: 20px;
}

.channel-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 12px;
}

.channel-link {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #2b6cb0;
}

.channel-link:hover {
  text-decoration: underline;
}

/* 内容示例 */
.channel-examples {
  margin-bottom: 48px;
}

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

.example-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 16px;
}

.example-tag {
  flex-shrink: 0;
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #2b6cb0;
  background-color: #ebf4ff;
  border-radius: 4px;
  padding: 2px 8px;
}

.example-text {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.6;
}

/* 观看帮助 */
.channel-help {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 48px;
}

.channel-help .section-title {
  margin-bottom: 8px;
}

.channel-help .section-lead {
  margin-bottom: 16px;
}

.channel-help a {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #2b6cb0;
  margin-right: 24px;
}

.channel-help a:hover {
  text-decoration: underline;
}

/* ===== 专题推荐页 ===== */

/* 主推荐专题 */
.featured-topic {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 48px;
}

.featured-topic-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.featured-topic-body {
  padding: 32px;
}

.topic-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #2b6cb0;
  background-color: #ebf4ff;
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 14px;
}

.topic-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.topic-reason {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #2b6cb0;
  margin-bottom: 12px;
}

.topic-desc {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 20px;
}

.topic-entry-list {
  border-top: 1px solid #e2e8f0;
  padding-top: 16px;
}

.topic-entry-item {
  font-size: 0.875rem;
  color: #4a5568;
  padding: 6px 0;
  position: relative;
  padding-left: 20px;
}

.topic-entry-item::before {
  content: '›';
  position: absolute;
  left: 0;
  color: #2b6cb0;
  font-weight: 700;
}

/* 专题网格 */
.topic-list-section {
  margin-bottom: 48px;
}

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

.topic-card {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.topic-card-media {
  height: 160px;
  background-color: #e2e8f0;
}

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

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

.topic-card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.topic-card-desc {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-link {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #2b6cb0;
}

.topic-link:hover {
  text-decoration: underline;
}

/* 频道关联说明 */
.topic-channel-note {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 48px;
}

.topic-channel-note .section-title {
  margin-bottom: 8px;
}

.topic-channel-note .section-desc {
  margin-bottom: 12px;
}

.topic-channel-note a {
  font-size: 0.875rem;
  font-weight: 600;
  color: #2b6cb0;
}

.topic-channel-note a:hover {
  text-decoration: underline;
}

/* 侧栏提示 */
.sidebar-tip {
  margin-top: 24px;
  padding: 16px;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 0.8125rem;
  color: #4a5568;
  line-height: 1.6;
}

.sidebar-tip a {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #2b6cb0;
}

.sidebar-tip a:hover {
  text-decoration: underline;
}

/* ===== 观看指南页 ===== */

.usage-steps {
  margin-bottom: 48px;
}

.step-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.step-number {
  width: 44px;
  height: 44px;
  background-color: #2b6cb0;
  color: #ffffff;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-body {
  min-width: 0;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 12px;
}

.step-figure {
  margin: 12px 0 0;
}

.step-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 6px;
}

/* 导航说明表 */
.nav-explanation {
  margin-bottom: 48px;
}

.nav-table-wrap {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.nav-table {
  width: 100%;
  min-width: 480px;
}

.nav-table thead th {
  background-color: #f7fafc;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #1a1a1a;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid #e2e8f0;
}

.nav-table tbody td {
  font-size: 0.875rem;
  color: #4a5568;
  padding: 12px 16px;
  border-bottom: 1px solid #f0f0f0;
  line-height: 1.6;
}

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

.nav-note {
  font-size: 0.8125rem;
  color: #718096;
  line-height: 1.6;
}

.nav-note a {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #2b6cb0;
}

.nav-note a:hover {
  text-decoration: underline;
}

/* FAQ 预览 */
.faq-preview {
  margin-bottom: 48px;
}

.faq-more {
  margin-top: 16px;
}

.faq-more a {
  font-size: 0.875rem;
  font-weight: 600;
  color: #2b6cb0;
}

.faq-more a:hover {
  text-decoration: underline;
}

/* 侧栏卡片 */
.sidebar-card {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-card .sidebar-title {
  font-size: 0.9375rem;
  padding-bottom: 10px;
  margin-bottom: 12px;
}

.sidebar-card .sidebar-list a {
  border-bottom-color: #f0f0f0;
}

/* ===== 关于本站页 ===== */

.about-section {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.about-section .section-title {
  margin-bottom: 16px;
}

.section-text {
  font-size: 0.9375rem;
  color: #4a5568;
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-figure {
  margin: 24px 0 0;
}

.about-main-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 6px;
}

.about-figure figcaption {
  font-size: 0.8125rem;
  color: #718096;
  margin-top: 8px;
}

/* 边界列表 */
.boundary-list {
  margin: 16px 0;
}

.boundary-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.6;
}

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

.boundary-item::before {
  content: '·';
  font-size: 1.25rem;
  font-weight: 700;
  color: #2b6cb0;
  line-height: 1.2;
}

/* 侧栏链接 */
.sidebar-links li {
  margin-bottom: 2px;
}

.sidebar-links a {
  display: block;
  padding: 10px 0;
  font-size: 0.875rem;
  color: #2b6cb0;
  border-bottom: 1px solid #f0f0f0;
}

.sidebar-links a:hover {
  color: #1a4a7a;
  text-decoration: underline;
}

/* ===== 问题反馈页 ===== */

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

.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 20px 0;
}

.method-card {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 24px;
}

.method-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.method-card p {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 12px;
}

.method-card a {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #2b6cb0;
}

.method-card a:hover {
  text-decoration: underline;
}

.method-note {
  font-size: 0.8125rem;
  color: #718096;
  line-height: 1.6;
}

/* 反馈流程 */
.feedback-process {
  margin-bottom: 48px;
}

.process-intro {
  font-size: 0.9375rem;
  color: #4a5568;
  margin-bottom: 24px;
}

.process-steps {
  counter-reset: process-step-counter;
}

.process-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid #e2e8f0;
}

.process-step:last-child {
  border-bottom: none;
}

.process-step .step-number {
  background-color: #ebf4ff;
  color: #2b6cb0;
}

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

.step-content p {
  font-size: 0.875rem;
  color: #4a5568;
  line-height: 1.7;
}

/* 联系链接 */
.contact-links {
  margin-bottom: 48px;
}

.contact-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-link-list a {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #2b6cb0;
}

.contact-link-list a:hover {
  text-decoration: underline;
}

/* ===== 404 页面 ===== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-content {
  max-width: 520px;
  text-align: left;
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: #2b6cb0;
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 0.9375rem;
  color: #4a5568;
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  background-color: #2b6cb0;
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 6px;
  margin-bottom: 32px;
  transition: background-color 0.2s ease;
}

.error-btn:hover {
  background-color: #1a4a7a;
  color: #ffffff;
}

.error-links {
  border-top: 1px solid #e2e8f0;
  padding-top: 24px;
}

.error-links-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.error-link-list li {
  margin-bottom: 8px;
}

.error-link-list a {
  font-size: 0.875rem;
  color: #2b6cb0;
}

.error-link-list a:hover {
  text-decoration: underline;
}

/* ============================================================
   Responsive —— 响应式
   ============================================================ */

/* 平板及以下 */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 20px;
  }

  .nav-link {
    padding: 20px 12px;
    font-size: 0.875rem;
  }

  .nav-link::after {
    left: 12px;
    right: 12px;
  }

  .hero-content {
    gap: 32px;
  }

  .hero-title {
    font-size: 2.125rem;
  }

  .topics-layout {
    grid-template-columns: 1fr;
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 200px;
    gap: 32px;
  }

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

  .featured-topic-media img {
    min-height: 240px;
  }

  .footer-inner {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 32px;
  }

  .footer-updates {
    grid-column: 1 / -1;
  }
}

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 14px 20px;
    font-size: 0.9375rem;
  }

  .nav-link::after {
    left: 20px;
    right: auto;
    width: 24px;
  }

  /* 首页 */
  .hero-section {
    padding: 40px 0 48px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-media img {
    height: 220px;
  }

  .section-block {
    padding: 40px 16px;
  }

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

  .channel-tag-card {
    padding: 16px 14px;
  }

  .channel-tag-icon {
    width: 32px;
    height: 32px;
    margin-bottom: 10px;
  }

  .channel-tag-icon::before {
    top: 8px;
    left: 8px;
    width: 16px;
    height: 16px;
  }

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

  .topic-sub-card img {
    height: 100px;
  }

  .update-item {
    grid-template-columns: 36px 1fr;
    gap: 12px;
  }

  .update-number {
    font-size: 1.25rem;
  }

  .update-date {
    grid-column: 2;
    padding-top: 0;
  }

  .guide-entry {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .related-links {
    padding: 16px;
  }

  /* 内页 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 24px 16px 0;
  }

  .page-header {
    margin-bottom: 28px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 1.625rem;
  }

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

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

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

  .featured-topic-body {
    padding: 20px;
  }

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

  .step-item {
    grid-template-columns: 44px 1fr;
    gap: 14px;
  }

  .process-step {
    grid-template-columns: 44px 1fr;
    gap: 14px;
  }

  .about-section {
    padding: 20px;
  }

  .about-main-image {
    height: 200px;
  }

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

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

  .footer-updates {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    padding: 16px;
  }

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

  .error-code {
    font-size: 3rem;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .channel-tag-grid {
    grid-template-columns: 1fr;
  }

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

  .topic-sub-card img {
    height: 140px;
  }

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

  .footer-brand,
  .footer-updates {
    grid-column: 1;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .hero-cta {
    width: 100%;
    text-align: center;
  }
}