/* ============================================================
   BASE — 变量、重置、全局基础
   ============================================================ */
:root {
  --color-primary: #1a2a3a;
  --color-accent: #f5a623;
  --color-bg: #f7f7f7;
  --color-card: #ffffff;
  --color-text: #333333;
  --color-muted: #6b7a8a;
  --color-border: #e4e8ec;
  --color-accent-soft: #fef3e0;

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1200px;
  --container-pad: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;

  --header-height: 64px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 56px;
  --space-2xl: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 16px;
}

time {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-muted);
}

/* ============================================================
   LAYOUT — 全站视觉骨架
   ============================================================ */

/* --- 页头 --- */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(26, 42, 58, 0.15);
}

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

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  color: #ffffff;
}

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

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

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

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

.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #ffffff;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

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

.nav-list li a.is-current {
  color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.08);
  font-weight: 600;
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-2xl);
}

/* --- 面包屑 --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: #b0b8c0;
}

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

/* --- 页面标题区 --- */
.page-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 3px solid var(--color-primary);
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}

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

/* --- 页脚 --- */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad) var(--space-lg);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
}

.footer-brand .footer-logo {
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  max-width: 360px;
}

.footer-heading {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

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

.footer-meta {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-meta p {
  margin-bottom: 6px;
}

/* ============================================================
   COMPONENTS — 通用组件
   ============================================================ */

/* --- 区块标题 --- */
.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  position: relative;
}

.section-desc {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: var(--space-md);
}

.section-intro {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: var(--space-md);
}

/* --- 按钮 --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s ease;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: #e0940f;
  color: var(--color-primary);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-1px);
}

/* --- 频道标签 --- */
.channel-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-tag-list li a {
  display: block;
  padding: 10px 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  transition: all 0.2s ease;
}

.channel-tag-list li a:hover {
  background-color: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* --- 焦点报道卡片 --- */
.focus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.focus-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(26, 42, 58, 0.1);
}

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

.focus-card h3 {
  padding: var(--space-md) var(--space-md) 8px;
  font-size: 20px;
}

.focus-card p {
  padding: 0 var(--space-md);
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.focus-link {
  display: inline-block;
  margin: 0 var(--space-md) var(--space-md);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 14px;
}

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

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

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

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

.news-item a {
  display: block;
  transition: transform 0.2s ease;
}

.news-item a:hover {
  transform: translateX(4px);
}

.news-title {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

.news-summary {
  display: block;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 6px;
}

/* --- 专题卡片 --- */
.topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(26, 42, 58, 0.1);
}

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

.topic-card h3 {
  padding: var(--space-md) var(--space-md) 8px;
  font-size: 19px;
}

.topic-card p {
  padding: 0 var(--space-md);
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.topic-card a {
  display: inline-block;
  margin: 0 var(--space-md) var(--space-md);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 14px;
}

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

/* --- 编辑推荐 --- */
.picks-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.pick-item {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: var(--space-md);
  align-items: start;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease;
}

.pick-item:hover {
  transform: translateY(-2px);
}

.pick-reason {
  display: inline-block;
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.pick-item h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

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

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

.pick-item p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* --- 频道卡片（频道分类页） --- */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

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

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(26, 42, 58, 0.1);
}

.channel-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.channel-content {
  padding: var(--space-md);
}

.channel-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

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

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

/* --- 频道资讯列表 --- */
.channel-news-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.channel-news-list .news-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-md);
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  align-items: center;
}

.news-thumb img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.news-content .news-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

.news-excerpt {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 6px;
}

/* --- 频道提示 --- */
.tip-content {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
}

.tip-content p {
  font-size: 15px;
  margin-bottom: 12px;
}

.tip-content a {
  color: var(--color-accent);
  font-weight: 600;
}

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

/* --- 专题卡片（专题页） --- */
.topic-grid-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.topic-card-body {
  padding: var(--space-md);
}

.topic-card-title {
  font-size: 19px;
  margin-bottom: 8px;
}

.topic-card-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.topic-card-meta {
  font-size: 13px;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

/* --- 专题文章列表 --- */
.topic-entry {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.topic-entry-title {
  font-size: 18px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.article-list li {
  padding-left: 16px;
  position: relative;
}

.article-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.article-list li a {
  font-size: 15px;
  color: var(--color-primary);
}

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

/* --- 相关链接 --- */
.related-links {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  margin-top: var(--space-lg);
}

.related-links p {
  font-size: 15px;
  margin-bottom: 0;
}

.related-links a {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: var(--space-md);
}

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

/* --- 指南目录 --- */
.guide-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.guide-toc {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.toc-title {
  font-size: 18px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.toc-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

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

/* --- 指南步骤 --- */
.guide-step {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.guide-step h2 {
  font-size: 22px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.guide-step p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.guide-figure {
  margin: var(--space-md) 0;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 8px 0;
  text-align: center;
}

.guide-related {
  margin-top: var(--space-lg);
}

.guide-related h2 {
  font-size: 20px;
  margin-bottom: var(--space-sm);
}

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

.related-list li a {
  font-size: 15px;
  color: var(--color-primary);
  padding-left: 16px;
  position: relative;
}

.related-list li a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

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

/* --- 深度解读文章 --- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-lg);
  align-items: start;
}

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

.insight-section {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.insight-section h2 {
  font-size: 22px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.insight-section p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.timeline-block {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
}

.timeline-block h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.timeline-block p {
  font-size: 14px;
  margin-bottom: 0;
}

.insight-figure {
  margin: var(--space-md) 0;
}

.insight-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.insight-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 8px 0;
  text-align: center;
}

/* --- 深度解读侧栏 --- */
.insight-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

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

.sidebar-block h2 {
  font-size: 18px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-links li a {
  font-size: 14px;
  color: var(--color-primary);
  padding-left: 14px;
  position: relative;
}

.sidebar-links li a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

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

/* --- 关于页 --- */
.about-content {
  max-width: 860px;
}

.about-section {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.about-section h2 {
  font-size: 22px;
  margin-bottom: var(--space-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.about-section p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 12px;
}

.about-figure {
  margin: var(--space-md) 0;
}

.about-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.about-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 8px 0;
  text-align: center;
}

/* --- 404 页 --- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--container-pad);
}

.error-container {
  text-align: center;
  max-width: 560px;
  padding: var(--space-xl) 0;
}

.error-code {
  font-size: 96px;
  font-weight: 800;
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.error-title {
  font-size: 28px;
  margin-bottom: var(--space-sm);
}

.error-desc {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
}

.error-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   PAGES — 首页专属
   ============================================================ */

/* --- Hero 首屏 --- */
.hero-section {
  background-color: var(--color-primary);
  color: #ffffff;
}

.hero-section {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--container-pad);
}

.hero-copy h1 {
  color: #ffffff;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.hero-lead {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-lg);
  max-width: 520px;
}

.steps-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}

.step-item {
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
}

.step-arrow {
  color: var(--color-accent);
  font-size: 18px;
  font-weight: 700;
}

.hero-cta {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-primary);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 700;
  transition: all 0.2s ease;
}

.hero-cta:hover {
  background-color: #e0940f;
  color: var(--color-primary);
  transform: translateY(-2px);
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

/* --- 首页各区块 --- */
.home-main section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad);
}

.channel-nav-section {
  background-color: var(--color-card);
}

.focus-report,
.latest-news,
.topic-recommend,
.editor-picks,
.source-feedback {
  background-color: var(--color-bg);
}

.latest-news .section-title,
.topic-recommend .section-title,
.editor-picks .section-title,
.source-feedback .section-title {
  margin-bottom: var(--space-md);
}

/* --- 来源与反馈 --- */
.source-feedback {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
}

.source-feedback .section-title {
  color: #ffffff;
}

.source-feedback p {
  font-size: 15px;
  max-width: 720px;
  margin-bottom: var(--space-md);
}

.source-feedback a {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 15px;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.source-feedback a:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* ============================================================
   RESPONSIVE — 响应式
   ============================================================ */

@media (max-width: 1024px) {
  .channel-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .insight-sidebar {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-block {
    flex: 1;
    min-width: 200px;
  }

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

  .guide-toc {
    position: static;
  }

  .toc-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .toc-list li a {
    padding: 6px 14px;
    background-color: var(--color-accent-soft);
  }
}

@media (max-width: 768px) {
  :root {
    --container-pad: 16px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 21px;
  }

  .header-inner {
    height: 56px;
  }

  .brand-name {
    font-size: 17px;
  }

  /* 移动端导航 */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm) var(--container-pad);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    gap: 4px;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  /* 首页 hero */
  .hero-section {
    grid-template-columns: 1fr;
    padding: var(--space-xl) var(--container-pad);
    gap: var(--space-lg);
  }

  .hero-copy h1 {
    font-size: 26px;
  }

  .steps-indicator {
    gap: 6px;
  }

  .step-item {
    padding: 6px 12px;
    font-size: 13px;
  }

  /* 首页模块 */
  .focus-grid,
  .topic-grid,
  .topic-grid-wrapper {
    grid-template-columns: 1fr;
  }

  .pick-item {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

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

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

  .news-thumb img {
    aspect-ratio: 16 / 8;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: var(--space-lg) var(--container-pad);
  }

  .footer-brand p {
    max-width: 100%;
  }

  /* 404 */
  .error-code {
    font-size: 64px;
  }

  .error-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: var(--space-lg) var(--container-pad);
  }

  .home-main section {
    padding: var(--space-lg) var(--container-pad);
  }

  .channel-tag-list {
    gap: 8px;
  }

  .channel-tag-list li a {
    padding: 8px 14px;
    font-size: 14px;
  }

  .guide-step,
  .insight-section,
  .about-section {
    padding: var(--space-md);
  }

  .timeline-block {
    padding-left: var(--space-sm);
  }

  .insight-sidebar {
    flex-direction: column;
  }

  .sidebar-block {
    min-width: 100%;
  }
}

/* ============================================================
   ACCESSIBILITY — 可访问性
   ============================================================ */

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}