/* ============================================================
   base — 基础变量、重置、全局字体与颜色
   ============================================================ */
:root {
  --color-primary: #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-bg-light: #f8fafc;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-white: #ffffff;
  --color-border: #e5e7eb;
  --color-border-light: #f1f5f9;
  --color-accent-bg: #eff6ff;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-height: 64px;
  --header-height-scrolled: 48px;
  --container-width: 1200px;
  --font-sans: Arial, Helvetica, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: var(--font-sans);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --transition-fast: 0.2s 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-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg-light);
  min-height: 100vh;
}

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-light);
}

ul,
ol {
  list-style: none;
}

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

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

h1 {
  font-size: 2rem;
  letter-spacing: 0;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

h4 {
  font-size: 1rem;
}

p {
  letter-spacing: 0;
}

/* ============================================================
   layout — 全站统一骨架：页头、主容器、页脚
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  transition: height var(--transition-fast);
}

.site-header.is-scrolled {
  height: var(--header-height-scrolled);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-family: var(--font-sans);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.brand-tag {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.2;
}

.site-nav {
  flex-shrink: 0;
}

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-accent-bg);
}

.nav-list a.is-current {
  color: var(--color-primary);
  background-color: var(--color-accent-bg);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-fast);
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

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

.breadcrumb-sep {
  color: #9ca3af;
}

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

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

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 720px;
}

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
}

.footer-brand {
  margin-bottom: 28px;
}

.footer-site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer-col-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

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

.footer-col ul a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 16px;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================================
   components — 通用组件：按钮、卡片、列表、标签
   ============================================================ */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

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

.btn-primary:hover {
  background-color: #172e6d;
  color: var(--color-white);
}

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

.btn-secondary:hover {
  background-color: var(--color-accent-bg);
  color: var(--color-primary);
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary-light);
}

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

.text-link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: 12px;
}

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

/* ============================================================
   pages: index — 首页布局
   ============================================================ */
.site-home {
  background-color: var(--color-bg-light);
}

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  align-items: start;
}

.home-main > .module-block,
.home-main > section.module-block {
  grid-column: 1;
}

.home-main > .home-sidebar {
  grid-column: 2;
  grid-row: 1 / span 4;
}

/* 焦点报道 */
.hero-focus {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 0;
}

.focus-copy {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.hero-lead {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.hero-entry {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.hero-media {
  position: relative;
  min-height: 240px;
  background-color: var(--color-border-light);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}

/* 频道标签 */
.channel-tabs {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.tab-item {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 18px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.tab-item:hover {
  background-color: var(--color-accent-bg);
  color: var(--color-primary);
  border-color: var(--color-primary-light);
}

.tab-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* 最新资讯列表 */
.latest-news {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.news-list {
  display: flex;
  flex-direction: column;
}

.news-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.news-item:first-child {
  padding-top: 0;
}

.news-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.news-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.news-title a {
  color: var(--color-text);
}

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

.news-summary {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 6px;
}

.news-date {
  font-size: 0.8125rem;
  color: #9ca3af;
}

/* 侧栏 */
.home-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.topic-pick,
.editor-picks {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.topic-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.topic-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.topic-card-title {
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 16px 4px;
}

.topic-card-title a {
  color: var(--color-text);
}

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

.topic-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 0 16px 16px;
  line-height: 1.5;
}

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

.pick-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.pick-item:first-child {
  padding-top: 0;
}

.pick-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.pick-title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.pick-title a {
  color: var(--color-text);
}

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

.pick-reason {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ============================================================
   pages: channels — 频道分类页
   ============================================================ */
.page-channels {
  background-color: var(--color-bg-light);
}

.channel-list-section,
.channel-ranking-section,
.channel-related {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.channel-list-section h2,
.channel-ranking-section h2,
.channel-related h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
}

.channel-list-section h2::before,
.channel-ranking-section h2::before,
.channel-related h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary-light);
}

.channel-item {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.channel-item:first-child {
  padding-top: 0;
}

.channel-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.channel-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-border-light);
  min-height: 120px;
}

.channel-image {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.channel-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.channel-info > p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.channel-rep {
  font-size: 0.875rem;
}

.channel-rep a {
  font-weight: 500;
  color: var(--color-primary);
}

.channel-rep a:hover {
  color: var(--color-primary-light);
}

.ranking-intro {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.channel-ranking-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

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

.ranking-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

.ranking-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.ranking-content p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.ranking-note {
  font-size: 0.8125rem;
  color: #9ca3af;
}

.channel-related p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.channel-related p a {
  font-weight: 500;
  margin-right: 16px;
  white-space: nowrap;
}

/* ============================================================
   pages: topic — 内容专题页
   ============================================================ */
.page-topic {
  background-color: var(--color-bg-light);
}

.topic-grid {
  margin-bottom: 24px;
}

.topic-grid-container {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.topic-grid .topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
}

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

.topic-title {
  font-size: 1.125rem;
  font-weight: 600;
  padding: 16px 20px 4px;
}

.topic-excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: 0 20px 12px;
}

.topic-article-list {
  padding: 0 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.topic-article-list li {
  font-size: 0.875rem;
}

.topic-article-list li a {
  color: var(--color-text);
}

.topic-article-list li a:hover {
  color: var(--color-primary);
}

.topic-article-list li::before {
  content: "·";
  color: var(--color-primary-light);
  margin-right: 6px;
  font-weight: 700;
}

.topic-detail {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.topic-detail-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.detail-block {
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 20px;
}

.detail-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.detail-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.detail-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

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

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.related-card {
  display: block;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid var(--color-border-light);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-primary-light);
  background-color: var(--color-accent-bg);
}

.related-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

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

.related-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ============================================================
   pages: guide — 阅读指南页
   ============================================================ */
.page-guide {
  background-color: var(--color-bg-light);
}

.content-media-inline {
  margin: 16px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-border-light);
}

.content-media-inline img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 8px 16px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  background-color: var(--color-white);
}

.page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

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

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.toc-list li a:hover {
  background-color: var(--color-accent-bg);
  color: var(--color-primary);
}

.guide-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

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

.guide-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  padding-left: 14px;
}

.guide-section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary-light);
}

.guide-section > p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.guide-section > p a {
  font-weight: 500;
}

.guide-steps {
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.guide-steps li {
  counter-increment: step;
  position: relative;
  padding: 10px 12px 10px 44px;
  font-size: 0.9375rem;
  line-height: 1.6;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
}

.guide-steps li::before {
  content: counter(step);
  position: absolute;
  left: 12px;
  top: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

/* ============================================================
   pages: trending — 深度解读页
   ============================================================ */
.page-trending {
  background-color: var(--color-bg-light);
}

.article-list,
.editor-picks {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.section-heading {
  margin-bottom: 20px;
}

.section-heading h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
  position: relative;
  padding-left: 14px;
}

.section-heading h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary-light);
}

.section-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.article-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.article-item:first-child {
  padding-top: 0;
}

.article-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

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

.article-media img {
  width: 100%;
  height: 130px;
  object-fit: cover;
}

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

.article-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.article-content h3 a {
  color: var(--color-text);
}

.article-content h3 a:hover {
  color: var(--color-primary);
}

.article-meta {
  font-size: 0.8125rem;
  color: #9ca3af;
  margin-bottom: 8px;
}

.article-excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 10px;
}

.article-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

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

.editor-picks .pick-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
}

.pick-rank {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

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

.pick-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

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

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

.pick-content .pick-reason {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ============================================================
   pages: 404 — 错误页
   ============================================================ */
.site-error {
  background-color: var(--color-bg-light);
}

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.error-section {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  max-width: 640px;
  margin: 0 auto;
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.error-home-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.error-home-btn:hover {
  background-color: #172e6d;
  color: var(--color-white);
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.error-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-light);
}

.error-links a:hover {
  background-color: var(--color-accent-bg);
}

/* ============================================================
   responsive — 响应式
   ============================================================ */
@media (max-width: 1024px) {
  .home-main {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .hero-focus {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .focus-copy {
    padding: 24px;
  }

  .channel-item {
    grid-template-columns: 180px minmax(0, 1fr);
  }

  .article-item {
    grid-template-columns: 160px minmax(0, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
  }

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

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

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

  .nav-list a {
    display: block;
    padding: 14px 12px;
    font-size: 1rem;
    border-radius: 0;
  }

  .nav-list a.is-current {
    background-color: transparent;
  }

  .brand-tag {
    display: none;
  }

  .home-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .home-main > .home-sidebar {
    grid-column: 1;
    grid-row: auto;
  }

  .hero-focus {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-media {
    min-height: 200px;
    order: -1;
  }

  .hero-media img {
    position: static;
    height: 200px;
  }

  .focus-copy {
    padding: 24px;
  }

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

  .module-block {
    padding: 20px;
  }

  .footer-links-group {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .channel-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-media img {
    height: 180px;
  }

  .topic-grid-container {
    grid-template-columns: minmax(0, 1fr);
  }

  .topic-detail-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .related-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
  }

  .toc-sidebar {
    display: none;
  }

  .article-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-media img {
    height: 180px;
  }

  .inner-main {
    padding: 16px 16px 40px;
  }

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

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

  .error-section {
    padding: 32px 20px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    gap: 12px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .home-main {
    padding: 16px 12px 40px;
  }

  .inner-main {
    padding: 16px 12px 40px;
  }

  .hero-focus {
    border-radius: var(--radius-md);
  }

  .focus-copy {
    padding: 20px;
  }

  .hero-title {
    font-size: 1.375rem;
  }

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

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

  .module-block {
    padding: 16px;
  }

  .tab-item {
    padding: 8px 14px;
    font-size: 0.875rem;
  }

  .news-title {
    font-size: 1rem;
  }

  .news-summary {
    font-size: 0.875rem;
  }

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

  .topic-cover {
    height: 150px;
  }

  .detail-image {
    height: 140px;
  }

  .content-media-inline img {
    max-height: 200px;
  }

  .guide-section {
    padding: 16px;
  }

  .guide-steps li {
    padding: 10px 12px 10px 40px;
  }

  .guide-steps li::before {
    left: 10px;
    width: 22px;
    height: 22px;
    font-size: 0.75rem;
  }

  .article-item,
  .channel-item {
    gap: 12px;
  }

  .article-media img {
    height: 150px;
  }

  .channel-media img {
    height: 150px;
  }

  .error-code {
    font-size: 2.5rem;
  }

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

  .error-links a {
    width: 100%;
    text-align: center;
  }
}