/* ==========================================================================
   吃瓜网51 - 全站样式表
   版本: 1.0
   说明: 覆盖首页、内页、404页全部真实DOM结构
   ========================================================================== */

/* ==========================================================================
   Base - 基础重置与全局变量
   ========================================================================== */

:root {
  --color-primary: #1a3a5c;
  --color-primary-dark: #122a44;
  --color-primary-light: #2a5078;
  --color-bg: #f5f0e8;
  --color-bg-light: #faf7f2;
  --color-bg-white: #ffffff;
  --color-accent: #c0392b;
  --color-accent-dark: #a93226;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #888888;
  --color-border: #e0d8cc;
  --color-border-light: #ede7dd;

  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --container-padding: 20px;
  --content-width: 1200px;
  --readable-width: 720px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --header-height: 72px;
  --transition-base: 0.2s ease;
  --shadow-card: 0 1px 3px rgba(26, 58, 92, 0.08);
  --shadow-hover: 0 4px 12px rgba(26, 58, 92, 0.12);
}

*,
*::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: 16px;
  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-base);
}

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

ul,
ol {
  list-style: none;
}

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

figure {
  margin: 0;
}

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

/* ==========================================================================
   Layout - 全站布局骨架
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  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: var(--header-height);
  gap: var(--space-lg);
}

.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--color-bg-white);
}

.brand-link:hover {
  color: var(--color-bg-white);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 1px;
  line-height: 1.3;
}

.site-nav {
  flex-shrink: 0;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-link:hover {
  color: var(--color-bg-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.is-current .nav-link,
.nav-link.is-current {
  color: var(--color-bg-white);
  background-color: rgba(255, 255, 255, 0.15);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.1);
}

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

/* ==========================================================================
   Layout - 主体区域
   ========================================================================== */

.site-main {
  flex: 1;
}

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-padding) var(--space-3xl);
}

/* 面包屑 */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 12px;
}

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

/* 页面标题区 */

.page-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: var(--readable-width);
}

/* Section 标题通用 */

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  position: relative;
  padding-left: 14px;
}

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

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
  max-width: var(--readable-width);
}

/* ==========================================================================
   Components - 页脚
   ========================================================================== */

.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  border-top: 3px solid var(--color-accent);
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--container-padding) var(--space-xl);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer-col-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-bg-white);
  margin-bottom: var(--space-md);
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-bg-white);
  margin-bottom: var(--space-sm);
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.65);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-link {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: var(--color-bg-white);
}

.footer-help-text {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: var(--space-sm);
}

.footer-copy-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
}

/* ==========================================================================
   Components - 通用卡片与链接
   ========================================================================== */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  transition: color var(--transition-base);
}

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

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform var(--transition-base);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* ==========================================================================
   Components - 首页首屏 Hero
   ========================================================================== */

.hero-section {
  background-color: var(--color-primary);
  background-image: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 60%,
    var(--color-primary) 100%
  );
  color: var(--color-bg-white);
  padding: var(--space-3xl) var(--container-padding);
}

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

.hero-copy {
  max-width: 560px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-md);
  padding: 4px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 20px;
}

.hero-title {
  font-size: 38px;
  font-weight: 700;
  color: var(--color-bg-white);
  margin-bottom: var(--space-md);
  line-height: 1.25;
}

.hero-description {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-md);
}

.hero-description:last-child {
  margin-bottom: 0;
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

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

/* ==========================================================================
   Components - 首页区块通用
   ========================================================================== */

.section-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--container-padding);
}

.section-heading {
  margin-bottom: var(--space-lg);
}

.section-heading .section-title {
  margin-bottom: var(--space-sm);
}

.section-heading .section-desc {
  margin-bottom: 0;
}

/* ==========================================================================
   Components - 焦点报道
   ========================================================================== */

.focus-report {
  padding-top: var(--space-3xl);
}

.focus-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-xl);
  background-color: var(--color-bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.focus-content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.focus-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(192, 57, 43, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: var(--space-md);
}

.focus-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  line-height: 1.35;
}

.focus-summary {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.focus-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.focus-thumb {
  min-height: 260px;
}

.focus-thumb img {
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
}

/* ==========================================================================
   Components - 频道导航标签
   ========================================================================== */

.channels-nav-section {
  background-color: var(--color-bg-light);
}

.channels-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.channel-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

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

.channels-note {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Components - 最新资讯列表
   ========================================================================== */

.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.news-item {
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: var(--space-lg);
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.news-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.news-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

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

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

.news-summary {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  font-size: 13px;
  color: var(--color-text-muted);
}

.news-thumb {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.news-thumb img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.list-footer-note {
  text-align: center;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

/* ==========================================================================
   Components - 专题推荐卡片
   ========================================================================== */

.topic-recommend {
  background-color: var(--color-bg-light);
}

.topic-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.topic-card {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  border-top: 3px solid var(--color-accent);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.topic-card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

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

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

.topic-card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   Components - 编辑推荐
   ========================================================================== */

.picks-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.pick-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.pick-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-bg-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

.pick-content {
  flex: 1;
}

.pick-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

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

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

.pick-reason {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
}

/* ==========================================================================
   Components - 信息来源与反馈
   ========================================================================== */

.source-feedback {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
}

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

.source-feedback .section-title::before {
  background-color: var(--color-accent);
}

.feedback-content {
  max-width: var(--readable-width);
}

.feedback-text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-md);
}

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

/* ==========================================================================
   Pages - 频道分类页
   ========================================================================== */

.filter-desc {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-accent);
}

.filter-desc .section-title {
  font-size: 18px;
  margin-bottom: var(--space-sm);
}

.filter-desc p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.channel-card {
  background-color: var(--color-bg-white);
  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-link {
  display: block;
}

.channel-figure {
  overflow: hidden;
}

.channel-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.channel-card:hover .channel-img {
  transform: scale(1.03);
}

.channel-body {
  padding: var(--space-lg);
}

.channel-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.channel-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-lg) 0;
  margin-bottom: var(--space-xl);
}

.page-info {
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 8px 20px;
  background-color: var(--color-bg-white);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
}

.related-links {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

.related-links .section-title {
  font-size: 18px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

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

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

.related-list a {
  font-size: 15px;
  color: var(--color-text);
}

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

/* ==========================================================================
   Pages - 内容专题页
   ========================================================================== */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.topic-card.topic-card-large {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.topic-media {
  overflow: hidden;
}

.topic-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.topic-card:hover .topic-image {
  transform: scale(1.03);
}

.topic-content {
  padding: var(--space-lg);
}

.topic-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

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

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

.topic-excerpt {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.topic-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
}

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

.topic-link::after {
  content: "→";
  margin-left: 4px;
}

/* 专题页编辑推荐 */

.topic-page .pick-rank {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(192, 57, 43, 0.1);
  border-radius: var(--radius-sm);
}

/* 相关上下文 */

.related-context {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-top: var(--space-2xl);
  box-shadow: var(--shadow-card);
}

.related-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.inline-link {
  font-weight: 500;
  color: var(--color-accent);
  margin: 0 2px;
}

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

/* ==========================================================================
   Pages - 实用指南页
   ========================================================================== */

.guide-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
  align-items: center;
}

.guide-intro-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.guide-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: var(--space-sm) var(--space-md);
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-bg-white);
}

.guide-intro-text .section-title {
  font-size: 22px;
}

.guide-intro-text p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

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

/* 步骤 */

.guide-steps {
  margin-bottom: var(--space-2xl);
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  counter-reset: step-counter;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

.step-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  min-width: 140px;
  flex-shrink: 0;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-bg-white);
  background-color: var(--color-primary);
  border-radius: 50%;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
}

.step-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex: 1;
}

.step-text a {
  color: var(--color-accent);
  font-weight: 500;
}

.step-text a:hover {
  color: var(--color-accent-dark);
}

/* 技巧 */

.guide-tips {
  margin-bottom: var(--space-2xl);
  background-color: var(--color-bg-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.tips-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.tip-item {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  border-left: 3px solid var(--color-accent);
}

.tip-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.tip-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
}

/* 相关推荐 */

.guide-related {
  margin-top: var(--space-2xl);
}

.related-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.related-card {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.related-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.related-card-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.related-card-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
}

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

.related-card-link::after {
  content: "→";
  margin-left: 4px;
}

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

.faq-section {
  margin-bottom: var(--space-2xl);
}

.content-media-inline {
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.content-media-inline figcaption {
  padding: var(--space-sm) var(--space-md);
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-bg-white);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--transition-base);
}

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

.faq-question::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq-item[open] .faq-question {
  background-color: var(--color-bg-light);
}

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

.faq-answer {
  padding: 0 var(--space-lg) var(--space-lg);
}

.faq-answer p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

/* 反馈入口 */

.feedback-section {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
}

.feedback-section .feedback-content {
  max-width: none;
}

.feedback-content p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.feedback-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
}

.feedback-list li {
  padding-left: 20px;
  position: relative;
}

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

.feedback-list a {
  font-size: 15px;
  color: var(--color-primary);
  font-weight: 500;
}

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

/* ==========================================================================
   Pages - 404 页面
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--space-3xl) var(--container-padding);
  background-color: var(--color-bg);
}

.error-inner {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: 4px;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.error-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
}

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

.error-btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-bg-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

.error-btn:hover {
  background-color: var(--color-primary-light);
  color: var(--color-bg-white);
}

.error-link {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.error-link:hover {
  border-color: var(--color-primary);
  color: var(--color-accent);
}

/* ==========================================================================
   Responsive - 响应式布局
   ========================================================================== */

/* 平板（≤1024px） */

@media (max-width: 1024px) {
  .hero-section {
    gap: var(--space-lg);
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-image {
    height: 260px;
  }

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

  .focus-thumb img {
    height: 220px;
    min-height: 0;
  }

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

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

  .topic-card.topic-card-large {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* 手机（≤768px） */

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

  .header-inner {
    gap: var(--space-sm);
  }

  .brand-name {
    font-size: 20px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  /* 移动导航 */

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) 0;
  }

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

  .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

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

  .nav-link {
    padding: 14px var(--container-padding);
    font-size: 16px;
    border-radius: 0;
  }

  .nav-link:hover,
  .nav-item.is-current .nav-link {
    background-color: rgba(255, 255, 255, 0.12);
  }

  /* Hero */

  .hero-section {
    grid-template-columns: 1fr;
    padding: var(--space-2xl) var(--container-padding);
    gap: var(--space-lg);
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-description {
    font-size: 15px;
  }

  .hero-image {
    height: 200px;
  }

  /* 区块 */

  .section-block {
    padding: var(--space-xl) var(--container-padding);
  }

  .section-title {
    font-size: 20px;
  }

  /* 资讯列表 */

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

  .news-thumb img {
    height: 160px;
  }

  /* 专题 */

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

  /* 频道 */

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

  .channel-img {
    height: 140px;
  }

  /* 指南 */

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

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

  .step-item {
    flex-direction: column;
    gap: var(--space-md);
  }

  .step-meta {
    min-width: 0;
  }

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

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

  /* FAQ */

  .faq-question {
    font-size: 15px;
    padding: var(--space-md);
  }

  .faq-answer {
    padding: 0 var(--space-md) var(--space-md);
  }

  /* 页脚 */

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  /* 页面标题 */

  .page-title {
    font-size: 26px;
  }

  /* 编辑推荐 */

  .pick-item {
    gap: var(--space-md);
  }

  .pick-number {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  /* 404 */

  .error-code {
    font-size: 72px;
  }
}

/* 小屏手机（≤480px） */

@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    display: none;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-image {
    height: 180px;
  }

  .focus-content {
    padding: var(--space-lg);
  }

  .focus-title {
    font-size: 20px;
  }

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

  .topic-image {
    height: 180px;
  }

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

  .news-item {
    padding: var(--space-md);
  }

  .news-thumb img {
    height: 140px;
  }

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

  .error-actions {
    flex-direction: column;
    width: 100%;
  }

  .error-btn,
  .error-link {
    width: 100%;
    text-align: center;
  }
}

/* ==========================================================================
   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;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}