/* ============================================================
   51吃瓜最新 - 全站样式表
   设计方向：数据新闻风 · 清晰信息层级 · 克制色彩
   ============================================================ */

/* ============================================================
   01. Base —— 变量、重置、全局基础
   ============================================================ */
:root {
  --color-primary: #2c3e50;
  --color-accent: #e74c3c;
  --color-bg: #ecf0f1;
  --color-link: #3498db;
  --color-text: #2c3e50;
  --color-text-light: #5d6d7e;
  --color-border: #d5dbdb;
  --color-white: #ffffff;
  --color-card-bg: #ffffff;
  --color-footer-bg: #2c3e50;
  --color-footer-text: #bdc3c7;
  --color-footer-heading: #ffffff;

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

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

  --header-h: 64px;
  --transition-base: 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-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

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

p {
  margin-bottom: 1em;
}

time {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* 跳到正文链接 */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.875rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  color: #fff;
}

/* ============================================================
   02. Layout —— 全站骨架、容器、页头、页脚
   ============================================================ */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-primary);
}

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

.brand-name {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.brand-tagline {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.nav-list li a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background: rgba(231, 76, 60, 0.08);
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 页脚 */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  margin-top: 0;
}

.footer-shell {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 48px var(--shell-padding) 24px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-tagline {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-footer-heading);
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 520px;
  color: var(--color-footer-text);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-footer-heading);
  margin-bottom: 16px;
}

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

.footer-col ul li a {
  color: var(--color-footer-text);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

/* 内页公共骨架 */
.site-main {
  min-height: calc(100vh - var(--header-h) - 300px);
}

.inner-main {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 24px var(--shell-padding) 64px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

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

.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--color-primary);
}

.page-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.page-description {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0;
}

/* 通用布局容器 */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.layout-shell.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

/* ============================================================
   03. Components —— 按钮、卡片、侧栏、通用模块
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: #c0392b;
  color: #fff;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

/* 侧栏通用卡片 */
.sidebar-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-note {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* 来源注释 */
.source-note {
  background: rgba(236, 240, 241, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 48px;
}

.source-note .section-title {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.source-note p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
  line-height: 1.6;
}

.source-note p:last-child {
  margin-bottom: 0;
}

/* 滚动出现动画（不影响初始可见性） */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   04. Pages —— 首页
   ============================================================ */
.home-main {
  max-width: var(--shell-width);
  margin: 0 auto;
  padding: 0 var(--shell-padding) 64px;
}

/* 焦点报道 */
.hero-focus {
  background: var(--color-white);
  border-bottom: 3px solid var(--color-accent);
  margin: 24px 0 0;
  padding: 40px 0;
}

.focus-shell {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.focus-copy h1 {
  font-size: 2.125rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.focus-lead {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.focus-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.focus-media {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg);
}

.focus-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.focus-media figcaption {
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  background: var(--color-bg);
}

/* 频道快速导航 */
.channel-strip {
  padding: 40px 0 8px;
}

.strip-shell {
  max-width: var(--shell-width);
  margin: 0 auto;
}

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-tags li a {
  display: inline-block;
  padding: 8px 20px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all 0.2s ease;
}

.channel-tags li a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* 最新资讯列表 */
.latest-news {
  padding: 40px 0 8px;
}

.news-shell {
  max-width: var(--shell-width);
  margin: 0 auto;
}

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

.news-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.news-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.news-content h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
}

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

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

.news-summary {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-content time {
  font-size: 0.8125rem;
}

.list-footer-link {
  margin-top: 32px;
  text-align: right;
}

.list-footer-link a {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* 专题推荐 */
.topic-feature {
  padding: 40px 0 8px;
}

.topic-shell {
  max-width: var(--shell-width);
  margin: 0 auto;
}

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

.topic-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.topic-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.topic-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

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

.topic-card-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-card-body p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin: 0;
}

/* 编辑推荐 */
.editor-picks {
  padding: 40px 0 8px;
}

.picks-shell {
  max-width: var(--shell-width);
  margin: 0 auto;
}

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

.pick-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.pick-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.pick-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
}

.pick-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.pick-content p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin: 0;
}

/* ============================================================
   05. Pages —— 频道分类页
   ============================================================ */
.page-channels .layout-shell.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

.channel-index-list li {
  margin-bottom: 4px;
}

.channel-index-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

.channel-list-section {
  margin-bottom: 48px;
}

.channel-list-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

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

.channel-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.channel-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.channel-media {
  background: var(--color-bg);
  aspect-ratio: 16 / 10;
}

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

.channel-body {
  padding: 16px 20px 20px;
}

.channel-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.channel-body p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin: 0;
}

.channel-preview-section {
  margin-bottom: 48px;
}

.channel-preview-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.channel-preview-block {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
}

.channel-preview-block h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.preview-list li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(213, 219, 219, 0.4);
}

.preview-list li:last-child {
  border-bottom: 0;
}

.preview-list li a {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.preview-list li a:hover {
  color: var(--color-accent);
}

.channel-tip-section {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.channel-tip-section h2 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.channel-tip-section p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.channel-tip-section p:last-child {
  margin-bottom: 0;
}

.channel-tip-section p a {
  font-weight: 500;
  margin-right: 16px;
}

/* ============================================================
   06. Pages —— 内容专题页
   ============================================================ */
.topics-grid {
  margin-bottom: 48px;
}

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

.topic-card-link {
  display: block;
  color: inherit;
  height: 100%;
}

.topic-card-link:hover {
  color: inherit;
}

.topic-card-media {
  margin: 0;
  background: var(--color-bg);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

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

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

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

.topic-card-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.topic-card-summary {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.topic-card-meta {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

.topics-digest {
  margin-bottom: 48px;
}

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

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

.digest-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.digest-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.digest-item a {
  font-size: 0.875rem;
  font-weight: 500;
}

.related-entry {
  margin-bottom: 48px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.related-link {
  display: block;
  padding: 12px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================================
   07. Pages —— 阅读指南页
   ============================================================ */
.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.guide-content {
  min-width: 0;
  max-width: 780px;
}

.guide-section {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.guide-section:last-child {
  border-bottom: 0;
}

.guide-section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.guide-section h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 12px;
}

.guide-section p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 16px;
}

.guide-figure {
  margin: 20px 0;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 8px 12px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  background: var(--color-bg);
}

.guide-sidebar {
  min-width: 0;
}

.guide-sidebar .sidebar-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-primary);
}

.sidebar-links li {
  margin-bottom: 4px;
}

.sidebar-links li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.875rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

/* FAQ */
.faq-item {
  margin-bottom: 12px;
}

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

.faq-item summary {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-accent);
  flex-shrink: 0;
}

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

.faq-item details p {
  margin-top: 12px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============================================================
   08. Pages —— 深度解读页
   ============================================================ */
.content-wrap {
  min-width: 0;
}

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

.insight-list {
  margin-bottom: 48px;
}

.insight-list h2,
.analysis-summary h2,
.source-note h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.section-intro {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 24px;
}

.article-item {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 20px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.article-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.article-media {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

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

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

.article-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
}

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

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

.article-body p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* 分析摘要 */
.analysis-summary {
  margin-bottom: 48px;
}

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

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

.summary-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.summary-card p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin: 0;
}

/* 侧栏 */
.insight-sidebar {
  min-width: 0;
}

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

.sidebar-block h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-primary);
}

.sidebar-block ul li {
  margin-bottom: 4px;
}

.sidebar-block ul li a {
  display: block;
  padding: 8px 12px;
  font-size: 0.875rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-block ul li a:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* ============================================================
   09. Pages —— 404 页
   ============================================================ */
.error-main {
  min-height: calc(100vh - var(--header-h) - 300px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
}

.error-section {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.error-desc {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 24px;
}

.btn-back-home {
  display: inline-block;
  padding: 10px 28px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.btn-back-home:hover {
  background: #c0392b;
  color: #fff;
}

.error-help {
  margin-top: 24px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.error-help a {
  margin: 0 8px;
}

/* ============================================================
   10. Responsive —— 响应式适配
   ============================================================ */
@media (max-width: 1024px) {
  .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .pick-item:last-child {
    grid-column: span 2;
  }

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

@media (max-width: 768px) {
  :root {
    --shell-padding: 16px;
    --header-h: 56px;
  }

  .header-shell {
    gap: 12px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
    gap: 0;
  }

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

  .nav-list li a {
    padding: 12px 24px;
    border-radius: 0;
    border-bottom: 1px solid rgba(213, 219, 219, 0.4);
  }

  .nav-list li:last-child a {
    border-bottom: 0;
  }

  /* 焦点报道 */
  .focus-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .focus-copy h1 {
    font-size: 1.625rem;
  }

  /* 资讯列表 */
  .news-list {
    grid-template-columns: 1fr;
  }

  /* 专题 */
  .topic-grid {
    grid-template-columns: 1fr;
  }

  /* 编辑推荐 */
  .pick-list {
    grid-template-columns: 1fr;
  }

  .pick-item:last-child {
    grid-column: span 1;
  }

  /* 内页布局 */
  .layout-shell,
  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sidebar {
    order: 2;
  }

  .content-area {
    order: 1;
  }

  .guide-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .guide-sidebar {
    order: 2;
  }

  /* 频道页 */
  .channel-grid {
    grid-template-columns: 1fr;
  }

  /* 专题页 */
  .topics-grid-list {
    grid-template-columns: 1fr;
  }

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

  .related-links {
    grid-template-columns: 1fr;
  }

  /* 深度解读 */
  .article-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .article-media {
    aspect-ratio: 16 / 8;
  }

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

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

  .footer-shell {
    padding: 32px 16px 16px;
  }

  /* 面包屑 */
  .breadcrumb {
    margin-bottom: 16px;
    padding-bottom: 12px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  /* 页面标题 */
  .page-title {
    font-size: 1.5rem;
  }

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

  .inner-main {
    padding: 16px 16px 48px;
  }

  .source-note {
    padding: 16px;
    margin-top: 32px;
  }

  .topic-card-body {
    padding: 16px 20px 20px;
  }

  .channel-tip-section {
    padding: 16px;
  }

  .sidebar-card,
  .sidebar-block {
    padding: 16px;
  }

  .error-code {
    font-size: 4rem;
  }
}

@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 0;
  }

  .focus-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .focus-actions .btn {
    text-align: center;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tags li a {
    padding: 6px 14px;
    font-size: 0.8125rem;
  }

  .news-item {
    padding: 16px;
  }

  .pick-item {
    padding: 16px;
  }

  .pick-number {
    font-size: 1.375rem;
  }

  .topic-grid .topic-card-body h3 {
    font-size: 1rem;
  }

  .article-item {
    padding: 12px;
  }

  .article-body h3 {
    font-size: 1rem;
  }

  .summary-card {
    padding: 16px;
  }

  .related-link {
    font-size: 0.875rem;
    padding: 10px 12px;
  }

  .page-description {
    font-size: 0.875rem;
  }

  .section-title {
    font-size: 1.125rem;
  }

  .btn {
    padding: 10px 16px;
    font-size: 0.875rem;
  }
}

/* 打印适配 */
@media print {
  .site-header,
  .site-footer,
  .breadcrumb,
  .sidebar,
  .guide-sidebar,
  .insight-sidebar {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  .inner-main {
    max-width: 100%;
    padding: 0;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}