/* ============================================================
   www.51吃瓜 — 主题资讯与深度内容站
   整站样式表 v1.0
   设计方向：柔和科技风 · 浅灰白底 · 青绿色状态
   ============================================================ */

/* ============================================================
   Base — 重置、变量、全局基础
   ============================================================ */
:root {
  --color-bg: #f5f6f7;
  --color-surface: #ffffff;
  --color-primary: #00b894;
  --color-primary-dark: #00997d;
  --color-text: #2d3436;
  --color-text-light: #636e72;
  --color-border: #e3e7ea;
  --color-border-light: #eef1f3;
  --color-hover-bg: #f0faf7;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 56px;

  --shadow-card: 0 1px 3px rgba(45, 52, 54, 0.06),
    0 4px 12px rgba(45, 52, 54, 0.04);
  --shadow-hover: 0 2px 6px rgba(45, 52, 54, 0.08),
    0 8px 20px rgba(45, 52, 54, 0.06);

  --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: 1.7;
  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-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  color: var(--color-text);
  font-weight: 600;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 12px;
}

time {
  color: var(--color-text-light);
  font-size: 14px;
}

/* ============================================================
   Layout — 容器、骨架、通用布局
   ============================================================ */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

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

.brand-slogan {
  font-size: 13px;
  color: var(--color-text-light);
  border-left: 1px solid var(--color-border);
  padding-left: 12px;
  line-height: 1.4;
}

.site-nav {
  display: block;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast),
    background-color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-primary);
  background-color: var(--color-hover-bg);
}

.nav-list li a.is-current {
  color: var(--color-primary);
  background-color: var(--color-hover-bg);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
}

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

.site-main {
  flex: 1;
}

.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 14px;
  color: var(--color-text-light);
}

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

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

.breadcrumb-sep {
  color: #b2bec3;
  font-size: 13px;
}

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

/* 页面标题区 */
.page-header {
  padding: 24px 0 32px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
  margin-bottom: 0;
}

/* 通用 section 标题 */
.section-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  position: relative;
  padding-left: 14px;
}

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

/* ============================================================
   Components — 按钮、卡片、列表、页脚
   ============================================================ */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 184, 148, 0.25);
}

.btn-secondary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

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

/* 页脚 */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand .footer-site-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.footer-brand .footer-tagline {
  font-size: 14px;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 500;
}

.footer-brand .footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 0;
  max-width: 320px;
}

.footer-links-group h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links li a {
  font-size: 14px;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  grid-column: 1 / -1;
  border-top: 1px solid var(--color-border-light);
  padding-top: 20px;
  margin-top: 8px;
  text-align: center;
}

.footer-copyright p {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ============================================================
   Pages — 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
}

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

.focus-report-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.focus-report-heading {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-text);
}

.focus-report-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 520px;
}

.focus-report-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.channel-quick-entry {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-label {
  font-size: 13px;
  color: var(--color-text-light);
  margin-right: 4px;
  white-space: nowrap;
}

.channel-quick-entry a {
  font-size: 13px;
  padding: 6px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-text);
  transition: border-color var(--transition-fast),
    color var(--transition-fast), background-color var(--transition-fast);
}

.channel-quick-entry a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-hover-bg);
}

.focus-report-figure {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background-color: var(--color-surface);
}

.focus-report-image {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 最新资讯 */
.latest-news {
  padding: 48px 0 8px;
}

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

.news-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.news-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.news-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

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

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

.news-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 频道分类（首页） */
.channel-category {
  padding: 40px 0 8px;
}

.channel-category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.channel-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.channel-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.channel-item-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.channel-item-title a:hover {
  color: var(--color-primary);
}

.channel-item-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 专题推荐（首页） */
.topic-feature {
  padding: 40px 0 8px;
}

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

.topic-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.topic-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.topic-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.topic-card-title {
  font-size: 18px;
  font-weight: 600;
  padding: 16px 20px 0;
  margin-bottom: 8px;
}

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

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

.topic-card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 0 20px 20px;
  margin-bottom: 0;
}

/* 编辑推荐 */
.editor-recommend {
  padding: 40px 0 8px;
}

.recommend-list {
  display: grid;
  gap: 16px;
}

.recommend-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: baseline;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.recommend-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.recommend-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

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

.recommend-reason {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 信息来源与反馈 */
.source-feedback {
  padding: 40px 0 8px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-top: 16px;
}

.source-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 720px;
  margin-bottom: 20px;
}

.feedback-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.feedback-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.feedback-links a:hover {
  border-bottom-color: var(--color-primary);
}

/* ============================================================
   Pages — 频道分类（www51cg/channels.html）
   ============================================================ */
.channel-section {
  margin-bottom: 48px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 720px;
}

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

.channel-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.channel-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.channel-media {
  width: 120px;
  height: 90px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-bg);
}

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

.channel-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.channel-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.channel-name a {
  color: var(--color-text);
}

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

.channel-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.channel-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 32px;
}

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

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

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

.channel-note-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 32px;
}

.channel-note-section .section-title {
  margin-bottom: 16px;
}

.channel-note-section p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 760px;
}

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

/* ============================================================
   Pages — 内容专题（www51cg/topics.html）
   ============================================================ */
.topic-section {
  margin-bottom: 48px;
}

.topic-section .topic-grid {
  grid-template-columns: repeat(3, 1fr);
}

.topic-section .topic-card {
  display: flex;
  flex-direction: column;
}

.topic-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.topic-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 16px 20px 20px;
  flex: 1;
}

.topic-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

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

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

.topic-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

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

.topic-link::after {
  content: "→";
  margin-left: 4px;
  transition: transform var(--transition-fast);
}

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

.topic-intro-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 48px;
}

.topic-intro-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 760px;
}

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

.related-links {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px 32px;
}

.related-heading {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.related-list {
  display: grid;
  gap: 10px;
}

.related-list li a {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 4px 0;
  display: inline-block;
  transition: color var(--transition-fast);
}

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

/* ============================================================
   Pages — 实用指南（www51cg/guide.html）
   ============================================================ */

/* 侧栏在左的两栏布局 */
.sidebar-left {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}

.layout-shell.sidebar-left {
  margin-top: 0;
}

.guide-toc {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.toc-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.toc-list {
  display: grid;
  gap: 4px;
}

.toc-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.toc-list li a:hover {
  color: var(--color-primary);
  background-color: var(--color-hover-bg);
  border-left-color: var(--color-primary);
}

.guide-content {
  min-width: 0;
}

.guide-section {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.guide-section h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.guide-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 720px;
}

.guide-figure {
  margin: 20px 0 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
}

.guide-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

/* 工具推荐 */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.tool-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border);
}

.tool-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 操作步骤 */
.step-list {
  margin-top: 20px;
  display: grid;
  gap: 20px;
  counter-reset: step-counter;
}

.step-list li {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px 20px 64px;
  counter-increment: step-counter;
}

.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 20px;
  top: 20px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-list li h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-list li p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 相关推荐（指南页） */
.related-section {
  margin-top: 8px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px 32px;
}

.related-section h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  border-bottom: none;
  padding-bottom: 0;
}

.related-section .related-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.related-section .related-list li:last-child {
  border-bottom: none;
}

.related-section .related-list li a {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
}

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

.related-section .related-list li p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ============================================================
   Pages — 深度解读（www51cg/insight.html）
   ============================================================ */

/* 侧栏在左的两栏布局（body 级） */
.page-insight .sidebar-left {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
  width: 100%;
}

.page-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  align-self: start;
}

.sidebar-inner {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-list {
  display: grid;
  gap: 4px;
}

.sidebar-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.sidebar-list li a:hover {
  color: var(--color-primary);
  background-color: var(--color-hover-bg);
  border-left-color: var(--color-primary);
}

.sidebar-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

.sidebar-note-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.sidebar-note-text {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.sidebar-note-text a {
  color: var(--color-primary);
  font-weight: 500;
}

.sidebar-note-text a:hover {
  color: var(--color-primary-dark);
}

/* 解读正文 */
.content-section {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.section-body > p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 720px;
}

.content-figure {
  margin: 20px 0 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
}

.content-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.content-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

.analysis-list {
  margin: 16px 0 20px;
  display: grid;
  gap: 12px;
}

.analysis-list li {
  position: relative;
  padding: 16px 20px 16px 48px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.analysis-list li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

.analysis-list li strong {
  display: block;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 4px;
}

.section-body > p strong {
  color: var(--color-text);
  font-weight: 600;
}

/* 结论摘要 */
.insight-summary {
  background-color: var(--color-hover-bg);
  border: 1px solid rgba(0, 184, 148, 0.2);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 20px;
}

.insight-summary p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.insight-summary p a {
  display: inline-block;
  margin-right: 12px;
  color: var(--color-primary);
  font-weight: 500;
  padding: 4px 0;
}

.insight-summary p a:hover {
  color: var(--color-primary-dark);
}

/* ============================================================
   Pages — 404
   ============================================================ */
.site-error {
  background-color: var(--color-bg);
}

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-section {
  text-align: center;
  max-width: 560px;
  width: 100%;
}

.error-code {
  font-size: 96px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.error-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 28px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 32px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    box-shadow var(--transition-fast);
  margin-bottom: 24px;
}

.error-btn:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 184, 148, 0.25);
}

.error-help {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.error-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.error-links a {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 6px 4px;
  transition: color var(--transition-fast);
}

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

.error-sep {
  color: #b2bec3;
  font-size: 13px;
}

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

/* 桌面 ≤1200px */
@media (max-width: 1200px) {
  .home-main,
  .site-main.inner-main,
  .page-insight .sidebar-left {
    padding-left: 20px;
    padding-right: 20px;
  }

  .header-inner,
  .footer-inner {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* 中等屏 ≤1024px */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-brand .footer-desc {
    max-width: 480px;
  }

  .footer-copyright {
    grid-column: 1 / -1;
  }

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

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

  .focus-report {
    gap: 32px;
  }
}

/* 平板 ≤900px */
@media (max-width: 900px) {
  .focus-report {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0;
  }

  .focus-report-figure {
    order: -1;
  }

  .focus-report-image {
    aspect-ratio: 16 / 9;
  }

  .focus-report-content {
    align-items: flex-start;
  }

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

  .sidebar-left,
  .layout-shell.sidebar-left,
  .page-insight .sidebar-left {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .guide-toc,
  .page-sidebar {
    position: static;
  }

  .guide-toc {
    order: -1;
  }

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

/* 手机 ≤768px */
@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    padding: 10px 16px;
    flex-wrap: wrap;
    position: relative;
  }

  .brand {
    margin-right: auto;
  }

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0;
    border-top: 1px solid var(--color-border-light);
    margin-top: 10px;
  }

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

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

  .home-main,
  .site-main.inner-main,
  .page-insight .sidebar-left {
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: 40px;
  }

  .page-header {
    padding: 20px 0 24px;
    margin-bottom: 32px;
  }

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

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

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

  .channel-category-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    padding: 32px 16px 20px;
    gap: 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-copyright {
    grid-column: 1 / -1;
  }

  .recommend-item {
    grid-template-columns: 1fr;
  }

  .breadcrumb {
    padding-top: 16px;
  }

  .error-main {
    padding: 48px 16px 64px;
  }

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

/* 小手机 ≤480px */
@media (max-width: 480px) {
  .brand-name {
    font-size: 19px;
  }

  .focus-report-heading {
    font-size: 24px;
  }

  .focus-report-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .channel-quick-entry {
    justify-content: flex-start;
  }

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

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

  .channel-media {
    width: 100%;
    height: 140px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-brand {
    grid-column: 1;
  }

  .footer-copyright {
    grid-column: 1;
  }

  .step-list li {
    padding: 16px 16px 16px 56px;
  }

  .step-list li::before {
    left: 16px;
  }

  .source-feedback {
    padding: 24px 20px;
  }

  .feedback-links {
    flex-direction: column;
    gap: 8px;
  }

  .error-links {
    gap: 8px;
  }
}