/* ============================================================
   51吃瓜网网址 - 全站样式表
   公共交通风 · 信息层级清晰 · 装饰克制
   ============================================================ */

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

:root {
  --color-text: #1a1a1a;
  --color-bg: #f5f5f5;
  --color-accent: #e63946;
  --color-secondary: #2a9d8f;
  --color-card: #ffffff;
  --color-border: #e0e0e0;
  --color-muted: #666666;
  --color-line: #d9d9d9;
  --font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --header-height: 64px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s 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-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

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: 1.2rem;
}

p {
  margin-bottom: 0.5rem;
}

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

/* ============================================================
   Layout - 全站骨架
   ============================================================ */

.site-header {
  background-color: var(--color-card);
  border-bottom: 2px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

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

.brand-slogan {
  font-size: 0.8125rem;
  color: var(--color-muted);
  white-space: nowrap;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
}

.nav-list li a:hover {
  color: var(--color-accent);
  background-color: rgba(230, 57, 70, 0.06);
}

.nav-list li a.is-current {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.site-footer {
  background-color: #1a1a1a;
  color: #cccccc;
  border-top: 3px solid var(--color-accent);
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
}

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

.footer-sitename {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 0.875rem;
  color: #999999;
  max-width: 480px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer-group-title {
  font-size: 0.9375rem;
  color: #ffffff;
  margin-bottom: 12px;
  font-weight: 600;
}

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

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

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

.footer-bottom {
  border-top: 1px solid #333333;
  padding-top: 16px;
  font-size: 0.8125rem;
  color: #888888;
}

/* ============================================================
   Components - 通用组件
   ============================================================ */

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

.breadcrumb-sep {
  color: #bbbbbb;
  margin: 0 2px;
}

.breadcrumb-current {
  color: var(--color-text);
  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;
  margin-bottom: 8px;
  color: var(--color-text);
}

.page-description {
  font-size: 0.9375rem;
  color: var(--color-muted);
  max-width: 720px;
  line-height: 1.7;
}

/* 区块标题 */
.section-title {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
  line-height: 1.3;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 6px 0;
}

.text-link::after {
  content: "→";
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.text-link:hover::after {
  transform: translateX(4px);
}

/* 图片容器 */
.topic-media,
.focus-media,
.article-thumb {
  overflow: hidden;
  background-color: #e8e8e8;
}

.topic-media img,
.focus-media img,
.article-thumb img,
.article-figure img,
.content-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

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

/* ============================================================
   Components - 首页模块
   ============================================================ */

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 60px;
}

/* 焦点报道区 */
.hero-focus {
  padding: 32px 0 28px;
}

.focus-headline {
  font-size: 1.625rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.3;
}

.focus-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.focus-media {
  position: relative;
  min-height: 320px;
}

.focus-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.focus-content {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}

.focus-tag {
  display: inline-block;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  align-self: flex-start;
  letter-spacing: 0.04em;
}

.focus-content .section-title {
  border-left: none;
  padding-left: 0;
  font-size: 1.375rem;
  margin-bottom: 0;
}

.focus-summary {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* 频道分类导航带 */
.channel-strip {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

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

.channel-tag {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.channel-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(230, 57, 70, 0.04);
}

/* 最新资讯列表 */
.latest-news {
  padding: 28px 0;
}

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

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

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

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.news-headline {
  font-size: 1.0625rem;
  font-weight: 600;
}

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

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

.news-summary {
  grid-column: 1 / -1;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.6;
}

.news-date {
  font-size: 0.8125rem;
  color: #999999;
  white-space: nowrap;
  align-self: start;
  padding-top: 2px;
}

/* 专题推荐区 */
.topic-feature {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

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

.topic-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.topic-media {
  position: relative;
  aspect-ratio: 16 / 8;
  width: 100%;
}

.topic-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-body {
  padding: 20px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-name,
.topic-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.topic-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

/* 编辑推荐 */
.editor-picks {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

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

.pick-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 16px;
  align-items: start;
  background-color: var(--color-card);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast);
}

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

.pick-badge {
  display: inline-block;
  background-color: var(--color-secondary);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  grid-row: span 2;
  margin-top: 3px;
  white-space: nowrap;
}

.pick-title {
  font-size: 1rem;
  font-weight: 600;
}

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

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

.pick-reason {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 信息来源与反馈 */
.source-feedback {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

.source-note {
  background-color: var(--color-card);
  border-left: 4px solid var(--color-secondary);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.source-note p {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.7;
}

.source-note a {
  color: var(--color-secondary);
  font-weight: 500;
}

.source-note a:hover {
  text-decoration: underline;
}

/* ============================================================
   Components - 内页通用模块
   ============================================================ */

/* 频道分类页 */
.channel-grid {
  margin-bottom: 40px;
}

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

.channel-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base);
}

.channel-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.channel-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background-color: #e8e8e8;
}

.channel-card-body {
  padding: 20px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.channel-card-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.channel-card-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.875rem;
  align-self: flex-start;
}

.card-link::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* 频道说明 */
.channel-description {
  margin-bottom: 40px;
}

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

.desc-item {
  background-color: var(--color-card);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-secondary);
}

.desc-item-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.desc-item-text {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
}

/* 相关推荐 */
.related-links {
  margin-top: 40px;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
}

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

.related-list li a {
  display: block;
  padding: 10px 14px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text);
  border-left: 3px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

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

/* ============================================================
   Components - 专题页
   ============================================================ */

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

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

.topic-content {
  padding: 20px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-summary {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.875rem;
  align-self: flex-start;
}

.topic-link::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.topic-link:hover::after {
  transform: translateX(4px);
}

/* 专题预览 */
.topic-preview {
  margin-bottom: 40px;
}

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

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

.preview-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.preview-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 12px;
}

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

.preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preview-tags li {
  font-size: 0.75rem;
  background-color: rgba(42, 157, 143, 0.1);
  color: var(--color-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* 专题相关链接 */
.topic-related {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  border: 1px solid var(--color-border);
}

.topic-related p {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.topic-related a {
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================================================
   Components - 指南页
   ============================================================ */

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.article-content {
  min-width: 0;
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
}

.article-figure {
  margin-bottom: 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.article-figure figcaption {
  font-size: 0.8125rem;
  color: var(--color-muted);
  padding: 10px 14px;
  background-color: var(--color-bg);
  line-height: 1.5;
}

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

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

.content-section > p {
  font-size: 0.9375rem;
  color: #444444;
  line-height: 1.75;
  margin-bottom: 16px;
}

.method-list,
.step-list,
.trap-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.method-list li,
.step-list li,
.trap-list li {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  border-left: 4px solid var(--color-accent);
}

.method-list h3,
.step-list h3,
.trap-list h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.method-list p,
.step-list p,
.trap-list p {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 0;
}

.related-links h2,
.related-title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.related-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.related-links ul li a {
  display: block;
  padding: 10px 14px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.related-links ul li a:hover {
  color: var(--color-accent);
  background-color: rgba(230, 57, 70, 0.06);
}

/* ============================================================
   Components - 深度解读页
   ============================================================ */

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

.article-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.article-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.article-thumb {
  position: relative;
  min-height: 170px;
}

.article-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-content {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-card);
  border-radius: 0;
  border: none;
}

.article-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.article-title a {
  color: var(--color-text);
}

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

.article-summary {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

.article-meta {
  font-size: 0.8125rem;
  color: #999999;
}

/* 编辑观点 */
.editor-note {
  margin-bottom: 40px;
}

.editor-note-content {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-secondary);
}

.editor-note-content p {
  font-size: 0.9375rem;
  color: #444444;
  line-height: 1.75;
}

/* ============================================================
   Components - 常见问题页
   ============================================================ */

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

.content-media-inline {
  margin-bottom: 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  max-width: 720px;
}

.content-media-inline img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
}

.content-media-inline figcaption {
  font-size: 0.8125rem;
  color: var(--color-muted);
  padding: 8px 14px;
  background-color: var(--color-bg);
}

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

.faq-item {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-accent);
}

.faq-question {
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  position: relative;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 0.9375rem;
  color: #444444;
  line-height: 1.7;
}

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

/* 反馈说明 */
.feedback-section {
  margin-bottom: 40px;
}

.feedback-content {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
}

.feedback-content p {
  font-size: 0.9375rem;
  color: #444444;
  line-height: 1.75;
}

.feedback-content a {
  color: var(--color-accent);
  font-weight: 500;
}

.feedback-content a:hover {
  text-decoration: underline;
}

/* ============================================================
   Components - 404 页
   ============================================================ */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 60px 20px;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-panel {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
  max-width: 480px;
  width: 100%;
  border: 1px solid var(--color-border);
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.error-title {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

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

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

.error-btn:hover {
  background-color: #c92a37;
  color: #ffffff;
}

/* ============================================================
   Responsive - 响应式
   ============================================================ */

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

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

  .article-card {
    grid-template-columns: 220px 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    padding: 8px 16px;
    flex-wrap: wrap;
    position: relative;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding: 8px 0 12px;
    gap: 0;
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-list li a {
    padding: 12px 8px;
    border-bottom: none;
    border-left: 3px solid transparent;
    width: 100%;
  }

  .nav-list li a.is-current {
    border-left-color: var(--color-accent);
    border-bottom-color: transparent;
  }

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

  .home-main {
    padding: 0 16px 48px;
  }

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

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

  .section-title {
    font-size: 1.25rem;
  }

  /* 首页 */
  .hero-focus {
    padding: 20px 0;
  }

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

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

  .focus-media {
    min-height: 220px;
    aspect-ratio: 16 / 9;
  }

  .focus-content {
    padding: 20px;
  }

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

  .topic-media {
    aspect-ratio: 16 / 9;
  }

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

  .pick-badge {
    grid-row: auto;
    justify-self: start;
    margin-top: 0;
    margin-bottom: 4px;
  }

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

  .news-date {
    justify-self: start;
    padding-top: 0;
  }

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

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

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

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

  /* 指南页 */
  .article-content {
    padding: 20px;
  }

  /* 解读页 */
  .article-card {
    grid-template-columns: 1fr;
  }

  .article-thumb {
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .article-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
  }

  .article-content {
    padding: 20px;
  }

  /* FAQ */
  .faq-question {
    padding: 14px 16px;
    font-size: 0.9375rem;
  }

  .faq-answer {
    padding: 0 16px 14px;
  }

  /* 页脚 */
  .footer-inner {
    padding: 32px 16px 20px;
  }

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

  .footer-brand {
    margin-bottom: 24px;
  }

  /* 404 */
  .error-main {
    padding: 40px 16px;
  }

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

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

@media (max-width: 480px) {
  .brand-slogan {
    display: none;
  }

  .brand-name {
    font-size: 1.25rem;
  }

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

  .focus-content {
    padding: 16px;
  }

  .topic-body,
  .topic-content,
  .channel-card-body {
    padding: 16px;
  }

  .desc-item,
  .preview-item {
    padding: 16px;
  }

  .article-content {
    padding: 16px;
  }

  .method-list li,
  .step-list li,
  .trap-list li {
    padding: 14px 16px;
  }

  .editor-note-content,
  .feedback-content,
  .related-links {
    padding: 16px;
  }

  .source-note {
    padding: 16px;
  }

  .pick-item {
    padding: 14px 16px;
  }
}

/* ============================================================
   Accessibility - 可访问性增强
   ============================================================ */

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

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