/* ==========================================================================
   base — 基础重置与全局变量
   ========================================================================== */
:root {
  --color-ink: #1a1a1a;
  --color-ink-soft: #333333;
  --color-muted: #666666;
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-accent: #e63946;
  --color-accent-dark: #c92a35;
  --color-border: #e0e0e0;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.1);
  --transition-base: 0.2s ease;
}

*,
*::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: 1.6;
  color: var(--color-ink-soft);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-ink);
  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-ink);
}

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

/* ==========================================================================
   layout — 全站布局骨架
   ========================================================================== */

/* 统一容器宽度 */
.header-shell,
.footer-shell,
.site-main,
.breadcrumb {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 页头 */
.site-header {
  background-color: var(--color-ink);
  color: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 24px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-surface);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
}

.brand-logo:hover .brand-name {
  color: var(--color-surface);
}

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

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

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

.nav-list a:hover {
  color: var(--color-surface);
  background-color: rgba(255, 255, 255, 0.1);
}

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

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  gap: 5px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-surface);
  border-radius: 1px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.75);
  margin-top: 64px;
}

.footer-shell {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-brand {
  max-width: 360px;
}

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

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-col h4 {
  font-size: 0.9375rem;
  color: var(--color-surface);
  margin-bottom: 12px;
}

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

.footer-col a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.65);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 16px;
  padding-bottom: 16px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.45);
}

/* 主内容区 */
.site-main {
  padding-top: 40px;
  padding-bottom: 40px;
  min-height: 60vh;
}

/* 面包屑 */
.breadcrumb {
  padding-top: 16px;
  padding-bottom: 0;
  font-size: 0.875rem;
  color: var(--color-muted);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: #999;
}

.breadcrumb-current {
  color: var(--color-ink);
}

/* 页面标题区 */
.page-header {
  margin-bottom: 36px;
}

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

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

.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--color-accent);
  display: inline-block;
}

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

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

.channel-tag {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-base);
}

.channel-tag:hover {
  color: var(--color-surface);
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 资讯列表项 */
.news-list {
  display: flex;
  flex-direction: column;
}

.news-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

.news-text h3 {
  font-size: 1.125rem;
  margin-bottom: 6px;
}

.news-text h3 a {
  color: var(--color-ink);
}

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

.news-summary {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 680px;
}

.news-item time {
  flex-shrink: 0;
  padding-top: 4px;
}

/* 专题卡片 */
.special-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base),
    transform var(--transition-base);
}

.special-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.special-media {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-border);
}

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

.special-body {
  padding: 20px;
}

.special-body h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.special-body h3 a {
  color: var(--color-ink);
}

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

.special-summary,
.special-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.special-link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

.special-link:hover {
  color: var(--color-accent-dark);
}

/* 编辑推荐条目 */
.editor-pick-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.editor-pick-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-card);
}

.editor-pick-item h3 {
  font-size: 1.0625rem;
  flex-shrink: 0;
  min-width: 200px;
}

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

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

.pick-reason {
  font-size: 0.9375rem;
  color: var(--color-muted);
}

/* 频道卡片 */
.channel-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

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

.channel-card h3 {
  font-size: 1.125rem;
  padding: 16px 20px 4px;
}

.channel-card p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  padding: 0 20px;
  line-height: 1.6;
}

.channel-card a {
  display: inline-block;
  margin: 12px 20px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

.channel-card a:hover {
  color: var(--color-accent-dark);
}

/* 指南步骤 */
.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.guide-step-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.guide-step-item h3 {
  font-size: 1.0625rem;
  min-width: 160px;
  flex-shrink: 0;
  padding-top: 2px;
}

.guide-step-item p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 指南图示 */
.guide-figure {
  margin: 24px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
  background-color: var(--color-surface);
  font-size: 0.875rem;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* 指南 FAQ 项 */
.guide-faq {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.guide-faq-item {
  padding: 20px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.guide-faq-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.guide-faq-item p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
}

.guide-faq-item p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 文章卡片 */
.article-items {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.article-card {
  display: flex;
  gap: 24px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base);
}

.article-card:hover {
  box-shadow: var(--shadow-hover);
}

.article-media {
  width: 280px;
  flex-shrink: 0;
}

.article-media img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
}

.article-body {
  padding: 24px 24px 24px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.article-body h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

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

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

.article-meta {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.article-body p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.article-body a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

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

.read-more {
  display: inline-block;
}

/* 方法列表 */
.method-content {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.method-content p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.method-list {
  margin: 16px 0 20px;
  padding-left: 4px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.method-list li {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
}

.method-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.method-list strong {
  color: var(--color-ink);
  font-weight: 600;
}

.method-content > a {
  display: inline-block;
  margin-right: 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

.method-content > a:hover {
  color: var(--color-accent-dark);
}

/* 相关链接 */
.related-links,
.related-reads {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-links h2,
.related-reads h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

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

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

.related-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.related-list a {
  font-size: 0.9375rem;
  color: var(--color-ink-soft);
}

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

.related-links > p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.related-links > p a {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 12px;
}

/* FAQ 手风琴 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 24px;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: background-color var(--transition-base);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

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

.faq-item summary:hover {
  background-color: rgba(230, 57, 70, 0.04);
}

.faq-answer {
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 反馈卡片 */
.feedback-card {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
}

.feedback-card p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.feedback-card p:last-child {
  margin-bottom: 0;
}

.feedback-card a {
  color: var(--color-accent);
  font-weight: 600;
}

/* 内容配图 */
.content-media {
  margin: 20px 0 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.content-media-inline {
  max-width: 720px;
}

.content-media figcaption {
  padding: 10px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
  font-size: 0.875rem;
  color: var(--color-muted);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* ==========================================================================
   pages — 页面专属模块
   ========================================================================== */

/* 首页 */
.hero-section {
  margin-bottom: 48px;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 24px;
  max-width: 760px;
  line-height: 1.25;
}

.hero-focus-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-media {
  width: 100%;
  min-height: 320px;
  overflow: hidden;
  background-color: var(--color-border);
}

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

.hero-content {
  padding: 36px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.hero-headline {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero-excerpt {
  font-size: 1rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.hero-link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-surface);
  background-color: var(--color-accent);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  align-self: flex-start;
  transition: background-color var(--transition-base);
}

.hero-link:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-surface);
}

/* 首页频道导航 */
.channel-nav-section {
  margin-bottom: 48px;
}

/* 首页最新资讯 */
.latest-news-section {
  margin-bottom: 48px;
}

/* 首页专题推荐 */
.special-grid-section {
  margin-bottom: 48px;
}

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

/* 首页编辑推荐 */
.editor-picks-section {
  margin-bottom: 48px;
}

/* 首页来源与反馈 */
.source-feedback-section {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
}

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

.feedback-link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
}

.feedback-link:hover {
  color: var(--color-accent-dark);
}

/* 频道分类页 */
.channel-grid {
  margin-bottom: 48px;
}

.channel-desc {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.channel-desc p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* 专题聚合页 */
.special-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-bottom: 48px;
}

.special-list .special-card {
  display: grid;
  grid-template-columns: 320px 1fr;
}

.special-list .special-media {
  aspect-ratio: auto;
  height: 100%;
  min-height: 200px;
}

.special-list .special-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.special-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.special-meta {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-top: 12px;
}

.special-intro {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.special-intro p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.special-intro p:last-child {
  margin-bottom: 0;
}

/* 指南页 */
.guide-steps {
  margin-bottom: 48px;
}

.tips {
  margin-bottom: 48px;
}

.tips-content {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.tips-content p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.tips-content p:last-child {
  margin-bottom: 0;
}

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

.source-feedback {
  background-color: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
}

.source-feedback p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* 深度解读页 */
.article-list {
  margin-bottom: 48px;
}

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

/* FAQ 页 */
.faq-list {
  margin-bottom: 48px;
}

.feedback {
  margin-top: 48px;
}

/* 404 页面 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  max-width: 520px;
  padding: 48px 40px;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

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

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

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

.error-btn {
  display: inline-block;
  padding: 10px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-surface);
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base);
}

.error-btn:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-surface);
}

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

/* 平板与桌面窄屏 */
@media (max-width: 992px) {
  .channel-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-focus-card {
    grid-template-columns: 1fr;
  }

  .hero-media {
    min-height: 240px;
    max-height: 360px;
  }

  .special-list .special-card {
    grid-template-columns: 240px 1fr;
  }

  .article-card {
    flex-direction: column;
  }

  .article-media {
    width: 100%;
  }

  .article-media img {
    min-height: 200px;
    max-height: 280px;
  }

  .article-body {
    padding: 0 24px 24px;
  }
}

/* 移动端 */
@media (max-width: 768px) {
  .header-shell {
    padding-left: 16px;
    padding-right: 16px;
    min-height: 56px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }

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

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

  .nav-list a {
    padding: 14px 20px;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-main {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .header-shell,
  .footer-shell,
  .site-main,
  .breadcrumb {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 页脚 */
  .footer-shell {
    flex-direction: column;
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 24px;
  }

  .footer-links {
    gap: 32px;
    flex-wrap: wrap;
  }

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

  .hero-content {
    padding: 24px;
  }

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

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

  .editor-pick-item {
    flex-direction: column;
    gap: 6px;
  }

  .editor-pick-item h3 {
    min-width: 0;
  }

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

  .news-item time {
    order: -1;
  }

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

  .channel-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .special-list .special-media {
    aspect-ratio: 16 / 9;
    min-height: 0;
  }

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

  .guide-step-item h3 {
    min-width: 0;
  }

  .method-content {
    padding: 20px;
  }

  .faq-item summary {
    padding: 14px 44px 14px 16px;
    font-size: 1rem;
  }

  .faq-answer {
    padding: 0 16px 16px;
  }

  .feedback-card {
    padding: 20px;
  }

  .source-feedback-section,
  .channel-desc,
  .special-intro,
  .tips-content,
  .source-feedback {
    padding: 20px;
  }

  .error-panel {
    padding: 32px 24px;
  }

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

  .content-media {
    margin: 16px 0 20px;
  }
}

/* 超小屏 */
@media (max-width: 390px) {
  .brand-name {
    font-size: 1.125rem;
  }

  .brand-slogan {
    font-size: 0.6875rem;
  }

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

  .channel-tag {
    padding: 6px 14px;
    font-size: 0.875rem;
  }

  .hero-media {
    min-height: 180px;
  }

  .hero-content {
    padding: 20px;
  }

  .hero-headline {
    font-size: 1.25rem;
  }

  .footer-links {
    flex-direction: column;
    gap: 24px;
  }
}