/* ============================================================
   51吃瓜网官网 - 全站样式表
   视觉方向：地产信息风 / 冷色调 / 清晰信息层级
   ============================================================ */

/* ============================================================
   Base
   ============================================================ */

:root {
  --color-dark: #1a1a2e;
  --color-navy: #16213e;
  --color-blue: #0f3460;
  --color-accent: #e94560;
  --color-bg: #f5f5f5;
  --color-white: #ffffff;
  --color-text: #2d2d3a;
  --color-text-light: #6b6b7a;
  --color-border: #e0e0e8;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-card: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-card-hover: 0 6px 20px rgba(26, 26, 46, 0.12);
  --transition-base: 0.25s ease;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

/* ============================================================
   Layout 骨架（全站统一）
   ============================================================ */

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

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-link {
  display: flex;
  align-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: 0.02em;
}

.brand-name {
  white-space: nowrap;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.95rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.nav-list li a:hover {
  color: var(--color-accent);
  background-color: rgba(233, 69, 96, 0.06);
}

.nav-list li a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(233, 69, 96, 0.08);
}

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

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* 主内容 */
.site-main {
  flex: 1;
  width: 100%;
}

/* 内页统一容器 */
.layout-shell,
.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  padding-top: 32px;
  padding-bottom: 56px;
  align-items: start;
}

.layout-shell {
  padding-top: 32px;
  padding-bottom: 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

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

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

.breadcrumb-sep {
  color: #b0b0bc;
}

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

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

.page-title {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.35;
  margin-bottom: 8px;
}

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

/* 内页主内容与侧栏 */
.main-content,
.content-area {
  min-width: 0;
}

.sidebar,
.sidebar-area {
  min-width: 0;
}

/* ============================================================
   Components（通用组件）
   ============================================================ */

/* 区块标题 */
.section-title {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.section-intro {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

/* 侧栏卡片 */
.sidebar-card,
.sidebar-block,
.sidebar-box {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

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

.sidebar-links a,
.sidebar-list a {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text);
  padding: 4px 0;
  border-bottom: 1px dashed var(--color-border);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.sidebar-links a:hover,
.sidebar-list a:hover {
  color: var(--color-accent);
  padding-left: 6px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-navy);
  color: #c8c8d4;
  margin-top: auto;
}

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

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

.footer-brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  display: block;
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 0.9rem;
  color: #9a9ab0;
  max-width: 480px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 14px;
}

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

.footer-group ul a {
  font-size: 0.875rem;
  color: #9a9ab0;
}

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

.footer-bottom {
  padding-top: 20px;
  text-align: center;
}

.copyright {
  font-size: 0.8rem;
  color: #7a7a90;
}

/* 按钮 */
.btn-primary,
.btn-secondary,
.btn-back,
.btn-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
}

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

.btn-primary:hover {
  background-color: #d6384f;
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--color-blue);
  color: var(--color-white);
}

/* ============================================================
   首页专属模块
   ============================================================ */

/* 首屏焦点区 */
.hero-section {
  background-color: var(--color-dark);
  color: var(--color-white);
  padding: 64px 0;
  margin-bottom: 0;
}

.hero-section .hero-content,
.hero-section .hero-media {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  padding: 0 0 0 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 1.05rem;
  color: #b8b8c8;
  margin-bottom: 28px;
  max-width: 520px;
}

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

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

.hero-actions .btn-secondary {
  border-color: #4a4a68;
  color: #d0d0dc;
}

.hero-actions .btn-secondary:hover {
  background-color: #4a4a68;
  color: var(--color-white);
}

.hero-media {
  padding-right: 24px;
}

.hero-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

/* 焦点报道区 */
.focus-report-section,
.channel-nav-section,
.latest-news-section,
.topics-section,
.editor-picks-section,
.info-feedback-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

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

.focus-report-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.focus-report-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.focus-report-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

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

.focus-report-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.focus-report-title a {
  color: var(--color-dark);
}

.focus-report-title a:hover {
  color: var(--color-accent);
}

.focus-report-summary {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.focus-report-date {
  font-size: 0.8rem;
  color: #a0a0b0;
}

/* 频道分类导航带 */
.channel-nav-section {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.channel-tags {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.channel-tag {
  display: block;
  text-align: center;
  padding: 14px 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-navy);
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.channel-tag:hover {
  background-color: var(--color-blue);
  color: var(--color-white);
  border-color: var(--color-blue);
}

/* 最新资讯列表 */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition-base);
}

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

.news-item:hover {
  padding-left: 8px;
}

.news-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 4px;
}

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

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

.news-summary {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.news-date {
  font-size: 0.8rem;
  color: #a0a0b0;
}

/* 专题推荐区（首页） */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

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

.topic-card .topic-title {
  padding: 16px 20px 0;
  font-size: 1.125rem;
  font-weight: 600;
}

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

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

.topic-description {
  padding: 8px 20px 20px;
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* 编辑推荐（首页） */
.editor-picks-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.editor-pick-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.editor-pick-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-card-hover);
}

.pick-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

.pick-reason {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* 信息来源与反馈 */
.info-feedback-section {
  background-color: var(--color-navy);
  color: #c8c8d4;
  padding-top: 40px;
  padding-bottom: 40px;
}

.info-feedback-section .section-title {
  color: var(--color-white);
}

.info-feedback-section .section-intro {
  color: #9a9ab0;
}

.feedback-note {
  font-size: 0.9rem;
  color: #9a9ab0;
  max-width: 720px;
  line-height: 1.8;
}

/* ============================================================
   频道页（channels.html）
   ============================================================ */

.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.channel-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.channel-media {
  height: 140px;
  background-color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.channel-body {
  padding: 20px;
}

.channel-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.channel-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

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

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

/* 频道内容预览 */
.preview-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

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

.preview-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-dark);
}

.preview-summary {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.preview-date {
  font-size: 0.8rem;
  color: #a0a0b0;
  margin-right: 12px;
}

.preview-link {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 500;
}

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

/* ============================================================
   专题页（topics.html）
   ============================================================ */

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

.topics-section .topic-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  margin-bottom: 24px;
}

.topic-media {
  height: 160px;
  overflow: hidden;
}

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

.topic-body {
  padding: 20px;
}

.topic-body .topic-title {
  padding: 0;
  margin-bottom: 8px;
}

.topic-summary {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.topic-preview {
  font-size: 0.875rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  padding: 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}

.topic-meta {
  font-size: 0.8rem;
  color: #a0a0b0;
}

/* 专题预览 */
.topic-preview-section {
  margin-bottom: 32px;
}

.topic-preview-section .preview-item {
  padding: 14px 0;
}

.topic-preview-section .preview-title {
  font-size: 0.95rem;
}

/* 相关链接 */
.related-section {
  margin-bottom: 32px;
}

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

.related-links a {
  font-size: 0.9rem;
  color: var(--color-blue);
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 4px;
}

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

/* ============================================================
   指南页（guide.html）
   ============================================================ */

.guide-section {
  margin-bottom: 40px;
}

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

.step-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: start;
}

.step-media {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-blue);
}

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

.step-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.step-content p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* 浏览技巧列表 */
.tips-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.tips-list .tip-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-card);
}

.tips-list .tip-item h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.tips-list .tip-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* 相关阅读 */
.related-links h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 12px;
}

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

.related-links ul a {
  font-size: 0.875rem;
  color: var(--color-blue);
}

.related-links ul a:hover {
  color: var(--color-accent);
}

/* ============================================================
   解读页（interpretation.html）
   ============================================================ */

.interpretation-list {
  margin-bottom: 40px;
}

.interpretation-item {
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
}

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

.item-text h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}

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

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

.item-summary {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.item-text time {
  font-size: 0.8rem;
  color: #a0a0b0;
}

.item-thumb {
  width: 160px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

/* 解读页编辑推荐 */
.editor-picks .pick-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-card);
  border-left: 3px solid var(--color-accent);
}

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

.editor-picks .pick-item h3 a {
  color: var(--color-dark);
}

.editor-picks .pick-item h3 a:hover {
  color: var(--color-accent);
}

.editor-picks .pick-reason {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* 相关栏目链接 */
.related-links p {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.related-links p a {
  color: var(--color-blue);
  margin-right: 12px;
}

.related-links p a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================================
   长尾页（longtail.html）
   ============================================================ */

.content-section {
  margin-bottom: 40px;
}

.content-section h2 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.content-section > p {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 20px;
}

.tip-item {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
}

.tip-item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.tip-item p {
  font-size: 0.925rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

.tip-item p a {
  color: var(--color-accent);
  font-weight: 500;
}

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

.content-figure {
  margin: 24px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.content-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.content-figure figcaption {
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  background-color: var(--color-white);
  text-align: center;
}

/* 筛选方法列表 */
.method-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.method-list li {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.method-list h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.method-list p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.content-section > p:last-child a {
  display: inline-block;
  margin-right: 16px;
  color: var(--color-blue);
  font-weight: 500;
}

.content-section > p:last-child a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================================
   404 页
   ============================================================ */

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

.error-section {
  text-align: center;
  padding: 48px 24px;
}

.error-container {
  max-width: 560px;
  margin: 0 auto;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

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

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

.btn-back:hover {
  background-color: #d6384f;
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
}

.btn-link {
  background-color: transparent;
  color: var(--color-blue);
  border: 1px solid var(--color-blue);
}

.btn-link:hover {
  background-color: var(--color-blue);
  color: var(--color-white);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-media {
    padding: 0 24px;
  }

  .hero-figure img {
    height: 260px;
  }

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

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

@media (max-width: 768px) {
  .header-container {
    height: 60px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    box-shadow: 0 8px 16px rgba(26, 26, 46, 0.1);
    border-bottom: 1px solid var(--color-border);
    z-index: 99;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }

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

  .layout-shell,
  .page-layout {
    padding: 0 16px;
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 24px;
  }

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

  .hero-section {
    padding: 40px 0;
  }

  .hero-content {
    padding: 0 16px;
  }

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

  .hero-description {
    font-size: 0.95rem;
  }

  .hero-figure img {
    height: 200px;
  }

  .focus-report-section,
  .channel-nav-section,
  .latest-news-section,
  .topics-section,
  .editor-picks-section,
  .info-feedback-section {
    padding: 32px 16px;
  }

  .focus-report-grid,
  .topics-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .topic-media {
    height: 180px;
  }

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

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

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

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

  .footer-container {
    padding: 32px 16px 20px;
  }

  .error-code {
    font-size: 3.5rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    text-align: center;
  }

  .channel-tags {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .channel-tag {
    padding: 10px 8px;
    font-size: 0.875rem;
  }

  .step-item {
    grid-template-columns: 56px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .step-media {
    width: 56px;
    height: 56px;
  }

  .method-list li {
    padding: 16px;
  }

  .content-figure img {
    height: 200px;
  }

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

  .error-actions .btn-back,
  .error-actions .btn-link {
    text-align: center;
  }
}

/* 打印样式（可选增强） */
@media print {
  .site-header,
  .site-footer,
  .sidebar,
  .sidebar-area,
  .breadcrumb,
  .nav-toggle {
    display: none !important;
  }

  .page-layout {
    display: block;
  }

  body {
    background-color: var(--color-white);
  }
}