/* ==========================================================================
   base — 基础重置、变量、全局字体与背景
   ========================================================================== */

:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;
  --color-border: #dee2e6;
  --color-primary: #0d6efd;
  --color-success: #198754;
  --color-accent-bg: #e9ecef;
  --color-code-bg: #f1f3f5;
  --color-code-text: #0d6efd;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, "Liberation Mono", Menlo, monospace;
  --container-width: 1200px;
  --container-padding: 24px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s 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: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #0a58ca;
  text-decoration: underline;
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
}

time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   layout — 全站统一骨架：页头、主体容器、页脚
   ========================================================================== */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
}

.brand-logo:hover {
  color: var(--color-text);
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-right: 8px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

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

.nav-list li a:hover {
  color: var(--color-primary);
  background-color: rgba(13, 110, 253, 0.06);
  text-decoration: none;
}

.nav-list li a.is-current {
  color: var(--color-primary);
  font-weight: 700;
  background-color: rgba(13, 110, 253, 0.08);
}

.site-main {
  min-height: 60vh;
}

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

.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding) 56px;
}

.site-main.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-padding) 64px;
}

.site-footer {
  background-color: var(--color-accent-bg);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-padding) 24px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0;
}

.footer-slogan {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

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

.footer-group h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

.footer-group ul li a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px var(--container-padding);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  text-align: center;
}

/* ==========================================================================
   components — 全站通用组件
   ========================================================================== */

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

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

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

/* 区块标题 */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

/* 卡片基础 */
.topic-card,
.channel-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

/* 通用侧栏 / 相关推荐 */
.related-links {
  margin-top: 40px;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.related-links h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.related-list li {
  margin-bottom: 10px;
}

.related-list li a {
  font-size: 0.9375rem;
  display: inline-block;
  padding-left: 12px;
  position: relative;
}

.related-list li a::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

/* ==========================================================================
   pages — 首页模块
   ========================================================================== */

/* 首屏焦点区 */
.hero-focus {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.hero-copy h1 {
  font-size: 2.25rem;
  line-height: 1.25;
  margin-bottom: 12px;
}

.hero-slogan {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.hero-description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin-bottom: 24px;
}

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

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

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

.btn-primary:hover {
  background-color: #0a58ca;
  border-color: #0a58ca;
  color: #ffffff;
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: rgba(13, 110, 253, 0.08);
  color: var(--color-primary);
  text-decoration: none;
}

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

/* 频道分类导航带 */
.channel-nav-strip {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.channel-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: rgba(13, 110, 253, 0.04);
  text-decoration: none;
}

/* 最新资讯列表 */
.latest-news {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 24px;
  align-items: baseline;
}

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

.news-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.news-item h3 a {
  color: var(--color-text);
  font-weight: 600;
}

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

.news-summary {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  grid-column: 1;
}

.news-item time {
  grid-column: 2;
  grid-row: 1;
  white-space: nowrap;
}

/* 专题推荐区 */
.topic-cards {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

.topic-card h3 {
  padding: 16px 16px 0;
  font-size: 1.125rem;
}

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

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

.topic-card p {
  padding: 8px 16px 16px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* 编辑推荐 */
.editor-picks {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.pick-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.pick-index {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
  line-height: 1.4;
}

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

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

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

.pick-reason {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* 信息来源与反馈说明 */
.source-info {
  padding: 32px 0;
}

.source-info p {
  max-width: 720px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   pages — 频道分类页
   ========================================================================== */

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

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

.channel-card {
  display: flex;
  flex-direction: column;
}

.channel-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: var(--color-text);
}

.channel-link:hover {
  text-decoration: none;
  color: var(--color-text);
}

.channel-thumb {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.channel-name {
  padding: 16px 16px 4px;
  font-size: 1.125rem;
  color: var(--color-text);
}

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

.channel-desc {
  padding: 0 16px 16px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.channel-details {
  margin-top: 8px;
}

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

.channel-info-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.info-item-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.info-item-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.info-item-text a {
  font-weight: 500;
}

/* ==========================================================================
   pages — 内容专题页
   ========================================================================== */

.topic-list-section {
  margin-bottom: 40px;
}

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

.topic-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.topic-content {
  padding: 16px;
}

.topic-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

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

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

.topic-content p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.topic-link::after {
  content: "→";
  margin-left: 4px;
  font-family: var(--font-mono);
}

.topic-intro-section {
  margin-bottom: 40px;
}

.intro-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.intro-block {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.intro-block h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.intro-block p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.entry-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.entry-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.entry-links a:hover {
  background-color: rgba(13, 110, 253, 0.08);
  text-decoration: none;
}

/* ==========================================================================
   pages — 实用指南页
   ========================================================================== */

.guide-section {
  margin-bottom: 48px;
}

.section-intro {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-bottom: 24px;
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.guide-step {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  align-items: center;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

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

.step-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.step-content p a {
  font-weight: 500;
}

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

.method-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.method-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.method-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.method-item p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.related-help {
  margin-top: 40px;
}

.related-help .related-links {
  margin-top: 0;
}

/* ==========================================================================
   pages — 深度解读页
   ========================================================================== */

.article-content {
  max-width: 780px;
  margin-bottom: 40px;
}

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

.article-section h2 {
  font-size: 1.375rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-section p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 16px;
}

.article-figure {
  margin: 20px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
}

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

.article-figure figcaption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  background-color: var(--color-accent-bg);
  font-family: var(--font-mono);
}

/* ==========================================================================
   pages — 信息反馈页
   ========================================================================== */

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

.content-media {
  margin: 16px 0 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.content-media-inline {
  max-width: 640px;
}

.content-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.content-media figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  background-color: var(--color-accent-bg);
  font-family: var(--font-mono);
}

.feedback-section > p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  max-width: 720px;
}

.feedback-methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

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

.feedback-method-card .method-title {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.feedback-method-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.feedback-method-card p a {
  font-weight: 500;
}

.feedback-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 16px;
  background-color: var(--color-accent-bg);
  border-radius: var(--radius-md);
  max-width: 720px;
}

.feedback-note a {
  font-weight: 500;
}

/* ==========================================================================
   pages — 404 页
   ========================================================================== */

.error-content {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  padding: 48px 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

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

.error-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
}

.error-back:hover {
  background-color: #0a58ca;
  color: #ffffff;
  text-decoration: none;
}

/* ==========================================================================
   responsive — 响应式断点
   ========================================================================== */

@media (max-width: 768px) {
  .header-inner {
    min-height: 56px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 16px 16px;
    gap: 0;
    box-shadow: var(--shadow-md);
  }

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

  .nav-list li a {
    display: block;
    padding: 12px 8px;
    border-radius: var(--radius-sm);
  }

  .site-main.home-main,
  .site-main.inner-main,
  .site-main.error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 16px;
  }

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

  .footer-bottom {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 首页 */
  .hero-focus {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 24px;
  }

  .hero-copy h1 {
    font-size: 1.75rem;
  }

  .hero-media img {
    height: 220px;
  }

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

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

  .channel-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .channel-tag {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .news-item time {
    grid-column: 1;
    grid-row: auto;
    white-space: normal;
  }

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

  .pick-item {
    flex-direction: column;
    gap: 8px;
  }

  /* 频道分类页 */
  .channel-grid {
    grid-template-columns: 1fr;
  }

  .channel-info-item {
    padding: 16px;
  }

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

  .intro-blocks {
    grid-template-columns: 1fr;
  }

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

  .entry-links a {
    justify-content: center;
  }

  /* 指南页 */
  .guide-step {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  /* 深度解读 */
  .article-content {
    max-width: 100%;
  }

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

  /* 反馈页 */
  .feedback-methods-grid {
    grid-template-columns: 1fr;
  }

  .content-media-inline {
    max-width: 100%;
  }

  /* 面包屑 */
  .breadcrumb {
    margin-bottom: 16px;
  }

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

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

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

  .channel-tag {
    min-height: 36px;
    padding: 6px 12px;
    font-size: 0.8125rem;
  }

  .topic-card img,
  .topic-media img {
    height: 180px;
  }

  .channel-thumb {
    height: 140px;
  }

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