/* ============================================================
   BASE — 基础变量、重置与全局排版
   ============================================================ */
:root {
  --color-dark: #1a1a2e;
  --color-accent: #e94560;
  --color-primary: #0f3460;
  --color-light: #f5f5f5;
  --color-white: #ffffff;
  --color-text: #2d2d3a;
  --color-text-light: #6b6b7b;
  --color-border: #e3e3ea;
  --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-body: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  --container-width: 1200px;
  --grid-gap: 24px;
  --radius: 8px;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 4px 16px rgba(26, 26, 46, 0.1);
  --header-height: 68px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-dark);
}

/* ============================================================
   LAYOUT — 全站布局骨架：页头、主容器、页脚
   ============================================================ */
.site-header {
  background-color: var(--color-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(26, 26, 46, 0.18);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--grid-gap);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-family: var(--font-heading);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  display: none;
}

.site-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

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

.nav-list li a {
  display: block;
  padding: 10px 16px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-list li a.is-current {
  color: var(--color-white);
  background-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--grid-gap);
}

.site-footer {
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.75);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--grid-gap) 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--grid-gap);
}

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

.footer-site-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

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

.footer-group h4 {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 14px;
}

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

.footer-group ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s ease;
}

.footer-group ul li a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px var(--grid-gap);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================================
   COMPONENTS — 通用组件与模块
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-size: 14px;
  color: var(--color-text-light);
}

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

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

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

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

.page-header {
  padding: 12px 0 28px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

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

.page-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 720px;
}

.inner-main {
  padding-top: 8px;
  padding-bottom: 48px;
}

/* ============================================================
   PAGES — 首页
   ============================================================ */
.home-main {
  padding-top: 24px;
}

.hero-focus {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--grid-gap);
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.focus-media {
  min-height: 360px;
  background-color: var(--color-primary);
}

.focus-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 360px;
}

.focus-content {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.focus-content h1 {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 16px;
}

.focus-excerpt {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.focus-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius);
  align-self: flex-start;
  transition: background-color 0.2s ease;
}

.focus-link:hover {
  background-color: #c93450;
  color: var(--color-white);
}

.channel-nav-section {
  margin-bottom: 40px;
}

.channel-nav-section h2,
.latest-news h2,
.topics-preview h2,
.editor-picks h2,
.source-feedback h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.channel-tag-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.channel-tag {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 14px;
  background-color: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.channel-tag:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  color: var(--color-dark);
}

.channel-icon {
  display: inline-block;
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  background-color: var(--color-primary);
  position: relative;
  flex-shrink: 0;
}

.channel-icon::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 4px;
  background-color: var(--color-accent);
}

.latest-news {
  margin-bottom: 40px;
}

.news-list {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 8px 24px;
  box-shadow: var(--shadow-sm);
}

.news-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.news-item h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.news-item h3 a {
  color: var(--color-dark);
}

.news-item h3 a:hover {
  color: var(--color-accent);
}

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

.news-item time {
  font-size: 13px;
  color: var(--color-text-light);
  font-family: var(--font-heading);
}

.more-link {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

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

.topics-preview {
  margin-bottom: 40px;
}

.topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

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

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

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

.topic-card-body h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.topic-card-body h3 a {
  color: var(--color-dark);
}

.topic-card-body h3 a:hover {
  color: var(--color-accent);
}

.topic-card-body p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.editor-picks {
  margin-bottom: 40px;
}

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

.pick-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.pick-item img {
  width: 140px;
  height: 96px;
  object-fit: cover;
  border-radius: var(--radius);
}

.pick-content h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.pick-content h3 a {
  color: var(--color-dark);
}

.pick-content h3 a:hover {
  color: var(--color-accent);
}

.pick-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.source-feedback {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px 32px;
  border-left: 4px solid var(--color-primary);
  margin-bottom: 24px;
}

.source-feedback h2 {
  font-size: 20px;
  margin-bottom: 12px;
  padding-left: 0;
  border-left: none;
}

.source-feedback p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.source-feedback p a {
  font-weight: 600;
}

/* ============================================================
   PAGES — 频道分类（channels）
   ============================================================ */
.layout-shell {
  display: grid;
  gap: var(--grid-gap);
  align-items: start;
}

.layout-shell.sidebar-left {
  grid-template-columns: 260px 1fr;
}

.channel-index {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.channel-index h2 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.channel-tabs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-tab {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.channel-tab:hover {
  background-color: var(--color-light);
  color: var(--color-accent);
}

.channel-tab.is-active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.channel-index-note {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.channel-content {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.channel-section {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.channel-section h2 {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--color-dark);
}

.channel-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.channel-figure {
  margin-bottom: 20px;
}

.channel-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius);
}

.channel-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 4px 0;
}

.channel-article-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.channel-article-list li {
  padding: 14px 16px;
  background-color: var(--color-light);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-primary);
}

.channel-article-list li h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.channel-article-list li h3 a {
  color: var(--color-dark);
}

.channel-article-list li h3 a:hover {
  color: var(--color-accent);
}

.channel-article-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.channel-more {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 28px;
}

.channel-more h2 {
  color: var(--color-white);
  font-size: 18px;
  margin-bottom: 8px;
}

.channel-more p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 12px;
}

.channel-more p a {
  color: var(--color-white);
  text-decoration: underline;
  margin-right: 12px;
}

.channel-more p a:hover {
  color: var(--color-accent);
}

/* ============================================================
   PAGES — 内容专题（topics）
   ============================================================ */
.section-title {
  font-size: 22px;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.topics-grid {
  margin-bottom: 40px;
}

.grid-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.media-wrap {
  overflow: hidden;
}

.media-wrap img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.card-body {
  padding: 20px;
}

.card-body h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.card-body h3 a {
  color: var(--color-dark);
}

.card-body h3 a:hover {
  color: var(--color-accent);
}

.card-body p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

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

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

.topic-summaries {
  margin-bottom: 40px;
}

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

.summary-item {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.summary-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-dark);
}

.summary-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.topics-aside {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
  margin-top: 8px;
}

.aside-block {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.aside-block h3 {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

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

.aside-links li a {
  font-size: 14px;
  line-height: 1.6;
}

/* ============================================================
   PAGES — 实用指南（guide）
   ============================================================ */
.guide-section {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.guide-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.content-media {
  margin-bottom: 20px;
}

.content-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 4px 0;
}

.content-media-inline {
  max-width: 720px;
}

.section-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 24px;
}

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

.guide-task-item {
  background-color: var(--color-light);
  border-radius: var(--radius);
  padding: 20px;
  border-top: 3px solid var(--color-primary);
}

.guide-task-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--color-dark);
}

.guide-task-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.guide-task-item a {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.guide-task-item a:hover {
  color: var(--color-primary);
}

.related-links {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
}

.related-links h2 {
  font-size: 18px;
  margin-bottom: 14px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-list li {
  padding: 10px 14px;
  background-color: var(--color-light);
  border-radius: var(--radius);
}

.related-list li a {
  font-size: 15px;
  font-weight: 500;
}

/* ============================================================
   PAGES — 深度解读（insight）
   ============================================================ */
.page-layout.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--grid-gap);
  align-items: start;
}

.insight-article {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.article-media {
  margin-bottom: 24px;
}

.article-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
}

.article-media figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 4px 0;
}

.content-section {
  margin-bottom: 28px;
}

.content-section h2 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--color-dark);
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.content-section p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text);
  margin-bottom: 12px;
}

.content-section.related-links {
  background-color: var(--color-light);
  padding: 20px;
}

.content-section.related-links h2 {
  font-size: 17px;
}

.insight-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--grid-gap);
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

.sidebar-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-card h3 {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

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

.sidebar-links li a {
  font-size: 14px;
  line-height: 1.6;
}

/* ============================================================
   PAGES — 常见问题（faq）
   ============================================================ */
.faq-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--grid-gap);
  align-items: start;
}

.faq-section {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.faq-section h2 {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

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

.faq-item summary {
  padding: 16px 20px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

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

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

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

.faq-answer p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
}

.faq-extra {
  display: flex;
  flex-direction: column;
  gap: var(--grid-gap);
}

.faq-note {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.faq-note h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.faq-note p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.faq-related {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.faq-related h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.faq-related ul li {
  margin-bottom: 8px;
}

.faq-related ul li a {
  font-size: 14px;
}

.faq-figure img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius);
}

.faq-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 8px 4px 0;
}

/* ============================================================
   PAGES — 404
   ============================================================ */
.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px var(--grid-gap);
}

.error-content {
  text-align: center;
  max-width: 520px;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 48px 40px;
  box-shadow: var(--shadow-sm);
}

.error-code {
  font-family: var(--font-heading);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

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

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color 0.2s ease;
}

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

/* ============================================================
   RESPONSIVE — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
  }

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-dark);
    padding: 0;
    box-shadow: 0 8px 16px rgba(26, 26, 46, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 4px;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 16px;
  }

  .hero-focus {
    grid-template-columns: 1fr;
  }

  .focus-media {
    min-height: 220px;
  }

  .focus-media img {
    min-height: 220px;
  }

  .focus-content {
    padding: 24px 20px;
  }

  .focus-content h1 {
    font-size: 24px;
  }

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

  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
  }

  .channel-index {
    position: static;
    margin-bottom: 8px;
  }

  .channel-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .channel-tab {
    padding: 8px 14px;
    background-color: var(--color-light);
  }

  .channel-tab.is-active {
    background-color: var(--color-primary);
  }

  .channel-index-note {
    display: none;
  }

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

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

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

  .page-layout.article-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .insight-sidebar {
    position: static;
  }

  .pick-item {
    grid-template-columns: 100px 1fr;
  }

  .pick-item img {
    width: 100px;
    height: 80px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    padding: 32px var(--grid-gap) 24px;
  }

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

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

  .page-header {
    padding: 8px 0 20px;
    margin-bottom: 24px;
  }
}

@media (max-width: 480px) {
  .channel-tag-list {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .channel-tag {
    padding: 12px 10px;
    font-size: 14px;
  }

  .channel-icon {
    width: 28px;
    height: 28px;
  }

  .news-list {
    padding: 8px 16px;
  }

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

  .pick-item img {
    width: 100%;
    height: 160px;
  }

  .channel-section,
  .guide-section,
  .faq-section,
  .insight-article {
    padding: 20px;
  }

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

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

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

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