/* ==========================================================================
   51吃瓜网站 - 整站样式表
   版本: 1.0
   说明: 覆盖全站公共骨架、首页模块、内页文档布局与响应式规则
   ========================================================================== */

/* ==========================================================================
   Base — 基础变量、重置与全站骨架
   ========================================================================== */

:root {
  --color-primary: #0F4C81;
  --color-primary-dark: #0B3B66;
  --color-primary-light: #E8F0F8;
  --color-accent: #E07A1F;
  --color-accent-light: #FDF1E7;
  --color-bg: #F4F6F8;
  --color-surface: #FFFFFF;
  --color-text: #1F2933;
  --color-text-secondary: #52606D;
  --color-border: #D3DCE6;
  --color-success: #1F9D6E;
  --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --content-width: 720px;
  --header-height: 64px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 35, 60, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 35, 60, 0.08);
  --transition-fast: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

/* 键盘可访问的跳过链接 */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 1000;
  padding: 10px 16px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 8px;
}

/* ==========================================================================
   Layout — 全站统一骨架
   ========================================================================== */

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

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

.brand-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* 主导航 */
.main-nav {
  margin-left: auto;
}

.main-nav ul {
  display: flex;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.main-nav a.is-current {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  font-weight: 600;
}

/* 页头 CTA */
.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}

.header-cta:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* 页脚 */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h3 {
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

.footer-col a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* 内页通用容器 */
.site-main {
  min-height: 60vh;
}

.site-main.inner-main {
  padding: 40px 0 64px;
}

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

/* 面包屑 */
.breadcrumb {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}

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

.breadcrumb-sep {
  color: var(--color-border);
  margin: 0 4px;
}

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

/* 面包屑 wrap（process 页专用） */
.breadcrumb-wrap {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 0;
}

/* 页面标题区 */
.page-title-area {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 24px;
}

.page-title-area p {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

.page-title-wrap {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.page-title-wrap p {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

/* 页面标题 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

/* 页面副标题 */
.page-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

.page-intro {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

.page-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

/* ==========================================================================
   Layout — 内页三栏文档布局（sidebar-left）
   ========================================================================== */

/* 侧栏在前的三栏布局：侧栏 + 正文 + 信息栏 */
.layout-shell.sidebar-left,
.page-layout.sidebar-left,
body > .sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 220px;
  gap: 32px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 兼容 body 直接作为 grid 容器的情况 */
body.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 220px;
  gap: 32px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

body.sidebar-left .site-header,
body.sidebar-left .site-footer,
body.sidebar-left .breadcrumb-wrap {
  grid-column: 1 / -1;
}

/* 左侧目录侧栏 */
.page-sidebar {
  min-width: 0;
}

.sidebar-inner,
.sidebar-card,
.toc-card,
.toc,
.toc-nav,
.sidebar-nav {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 84px;
}

.page-sidebar h2,
.sidebar-inner h2,
.sidebar-card h2,
.toc-title,
.toc-nav h2,
.sidebar-nav h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.page-sidebar ul li,
.toc-list li,
.sidebar-nav li,
.toc ul li {
  margin-bottom: 4px;
}

.page-sidebar a,
.toc-list a,
.sidebar-nav a,
.toc a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.page-sidebar a:hover,
.toc-list a:hover,
.sidebar-nav a:hover,
.toc a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* 中间正文区 */
.page-content {
  min-width: 0;
  max-width: 100%;
}

/* 右侧信息栏 */
.page-info-sidebar,
.page-info {
  min-width: 0;
}

.info-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 84px;
}

.info-card + .info-card {
  margin-top: 16px;
}

.info-card h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.info-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 16px 0 8px;
  color: var(--color-text);
}

.info-list {
  margin-bottom: 8px;
}

.info-list dt {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 2px;
}

.info-list dd {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.info-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.info-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.info-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  margin-top: 16px;
}

.related-links {
  list-style: none;
}

.related-links li {
  margin-bottom: 6px;
}

.related-links a {
  font-size: 14px;
  color: var(--color-primary);
}

/* ==========================================================================
   Components — 按钮、卡片、列表等通用组件
   ========================================================================== */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  border: 1px solid transparent;
  min-height: 44px;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* 内容区块 */
.content-section {
  margin-bottom: 48px;
}

.content-section h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.content-section h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 12px;
}

.content-section p {
  margin-bottom: 16px;
  max-width: var(--content-width);
}

/* 图片容器 */
.content-figure,
.page-figure,
.section-figure,
.process-figure,
.hero-figure,
.contact-hero-figure {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.content-figure img,
.page-figure img,
.section-figure img,
.process-figure img,
.hero-figure img,
.contact-hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.content-figure figcaption,
.page-figure figcaption,
.section-figure figcaption,
.process-figure figcaption,
.hero-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* 列表 */
.material-list,
.acceptance-list,
.boundary-list,
.cooperation-list {
  margin: 16px 0;
  padding-left: 0;
}

.material-list li,
.acceptance-list li,
.boundary-list li,
.cooperation-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.6;
}

.material-list li::before,
.acceptance-list li::before,
.boundary-list li::before,
.cooperation-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

.boundary-list-off li::before {
  background-color: var(--color-accent);
}

/* 材料分组 */
.material-group {
  margin-bottom: 24px;
}

.material-group h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.material-group ul li {
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.6;
}

.material-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
  margin-top: 24px;
}

.material-note a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* 复制链接交互 */
.copy-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.copy-section h2 {
  font-size: 18px;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 8px;
}

.copy-section p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.copy-link-box,
.copy-box {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.copy-link-btn,
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 20px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 14px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.copy-link-btn:hover,
.copy-button:hover {
  background-color: var(--color-primary-dark);
}

.copy-fallback-text {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.copy-url {
  font-size: 14px;
  color: var(--color-text-secondary);
  word-break: break-all;
  padding: 8px 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.copy-tip {
  font-size: 13px;
  color: var(--color-success);
  margin-top: 8px;
}

/* 相关链接导航 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-primary);
  padding: 6px 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.related-links-item:hover {
  border-color: var(--color-primary);
}

/* 内容底部导航 */
.content-nav {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.content-nav p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.content-nav ul {
  display: flex;
  gap: 16px;
}

.content-nav a {
  font-size: 14px;
  color: var(--color-primary);
}

/* ==========================================================================
   Components — 首页模块
   ========================================================================== */

/* 首屏信息总览 */
.hero-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

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

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-slogan {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.hero-figure {
  margin: 0;
}

.hero-figure img {
  aspect-ratio: 4 / 3;
}

/* 内容媒体（首页第二张图） */
.content-media {
  margin: 0;
}

.content-media-primary {
  grid-column: 1 / -1;
  margin-top: 24px;
}

.content-media-primary img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.content-media-primary figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 4px 0;
}

/* 通用区块 */
.section-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 640px;
}

/* 服务范围总览 */
.services-overview {
  background-color: var(--color-bg);
}

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

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

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

.service-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.service-card a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 项目推进预览 */
.process-preview {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.process-step {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background-color: var(--color-bg);
}

.step-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.process-step h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 公开内容与发展记录双栏 */
.info-duo {
  background-color: var(--color-bg);
}

.info-duo .duo-column {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.duo-column {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.duo-column .section-heading h2 {
  font-size: 20px;
}

.doc-list {
  margin: 8px 0 16px;
  flex: 1;
}

.doc-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.doc-list a {
  display: block;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.doc-type {
  display: inline-block;
  font-size: 12px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.text-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* 时间线预览 */
.timeline-preview {
  position: relative;
  padding-left: 20px;
}

.timeline-preview::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-dot {
  position: absolute;
  left: -17px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 2px solid var(--color-surface);
}

.timeline-preview p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  padding-left: 8px;
}

/* FAQ */
.faq-section {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.faq-list {
  max-width: var(--content-width);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background-color: var(--color-bg);
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  position: relative;
  padding-right: 40px;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-primary);
  font-weight: 400;
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 合作咨询横幅 */
.cta-banner {
  background-color: var(--color-primary);
  text-align: center;
}

.cta-banner h2 {
  color: #fff;
  font-size: 24px;
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 24px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.cta-banner .btn-primary {
  background-color: #fff;
  color: var(--color-primary);
}

.cta-banner .btn-primary:hover {
  background-color: var(--color-primary-light);
}

.cta-banner .btn-secondary {
  background-color: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.cta-banner .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   Components — 服务页
   ========================================================================== */

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

.service-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background-color: var(--color-surface);
}

.service-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.service-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.service-head h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  padding-top: 4px;
}

.service-desc {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.service-scope {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.service-scope::before {
  content: "适用情况：";
  font-weight: 600;
  color: var(--color-text);
}

.service-deliver {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.service-deliver::before {
  content: "交付标准：";
  font-weight: 600;
  color: var(--color-text);
}

/* 交付标准列表 */
.delivery-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.delivery-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  background-color: var(--color-surface);
}

.delivery-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.delivery-item ul {
  list-style: none;
}

.delivery-item ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.delivery-item ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* ==========================================================================
   Components — 项目推进页
   ========================================================================== */

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 32px;
  margin: 24px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.timeline-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.timeline-owner {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.timeline-output {
  font-size: 13px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: 10px;
  margin-top: 10px;
  margin-bottom: 0;
}

.timeline-output::before {
  content: "产出物：";
  font-weight: 600;
  color: var(--color-text);
}

/* 验收清单 */
.acceptance-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}

.acceptance-list li {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  padding-left: 40px;
  font-size: 14px;
  margin-bottom: 0;
}

.acceptance-list li::before {
  left: 16px;
  top: 0.75em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* ==========================================================================
   Components — 公开内容页
   ========================================================================== */

.doc-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 12px;
  background-color: var(--color-surface);
  transition: box-shadow var(--transition-fast);
}

.doc-item:hover {
  box-shadow: var(--shadow-sm);
}

.doc-item-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.doc-item-head h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
}

.doc-type-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.doc-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

.doc-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

/* 版本卡片 */
.version-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  background-color: var(--color-bg);
}

.version-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

/* 侧栏相关卡片 */
.related-card {
  margin-top: 16px;
}

.related-card ul li {
  margin-bottom: 6px;
}

.related-card a {
  font-size: 14px;
  color: var(--color-primary);
}

/* ==========================================================================
   Components — 发展记录页
   ========================================================================== */

/* 时间线列表 */
.timeline-list {
  position: relative;
  padding-left: 32px;
  margin: 24px 0;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-list .timeline-item {
  position: relative;
  margin-bottom: 24px;
}

.timeline-list .timeline-marker {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-list .timeline-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.timeline-list .timeline-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.timeline-list .timeline-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 节点卡片网格 */
.node-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.node-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background-color: var(--color-surface);
}

.node-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-primary);
}

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

/* ==========================================================================
   Components — 联系路径页
   ========================================================================== */

/* 联系主视觉 */
.contact-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 40px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.contact-hero-text h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
}

.contact-hero-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.contact-hero-figure {
  margin: 0;
}

/* 步骤列表 */
.steps-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.step-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background-color: var(--color-surface);
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.step-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 合作方式列表 */
.cooperation-list {
  margin: 16px 0;
}

.cooperation-list li {
  font-size: 15px;
}

.cooperation-list li::before {
  background-color: var(--color-accent);
}

/* 咨询前准备卡片 */
.prep-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 24px 0;
}

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

.prep-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

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

/* ==========================================================================
   Components — 404 页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 480px;
}

.error-title {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1;
}

.error-lead {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.error-action:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

/* ==========================================================================
   Responsive — 响应式规则
   ========================================================================== */

/* 桌面端断点 1024px */
@media (max-width: 1024px) {
  .layout-shell.sidebar-left,
  .page-layout.sidebar-left,
  body > .sidebar-left,
  body.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
  }

  .page-info-sidebar,
  .page-info {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-info-sidebar .info-card,
  .page-info .info-card {
    position: static;
    margin-top: 0;
  }

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

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

/* 移动端断点 768px */
@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

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

  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 8px 16px;
    gap: 2px;
  }

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

  .nav-toggle[aria-expanded="true"] + .main-nav,
  .nav-toggle[aria-expanded="true"] ~ .main-nav {
    max-height: 480px;
  }

  .header-cta {
    display: none;
  }

  /* 首页 hero */
  .hero-section {
    grid-template-columns: 1fr;
    padding: 32px 16px;
    gap: 24px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .hero-figure img {
    aspect-ratio: 16 / 9;
  }

  /* 首页服务卡片 */
  .service-card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页流程步骤 */
  .process-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页双栏 */
  .info-duo {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .duo-column + .duo-column {
    margin-top: 16px;
  }

  /* 首页 FAQ */
  .faq-item summary {
    font-size: 15px;
    padding: 14px 16px;
    padding-right: 36px;
  }

  .faq-item p {
    font-size: 14px;
    padding: 0 16px 14px;
  }

  /* 首页 CTA */
  .cta-banner {
    padding: 32px 16px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-actions .btn {
    width: 100%;
    max-width: 280px;
  }

  /* 内页三栏布局 */
  .layout-shell.sidebar-left,
  .page-layout.sidebar-left,
  body > .sidebar-left,
  body.sidebar-left {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 16px;
  }

  /* 移动端顺序：目录 → 正文 → 信息栏 */
  .page-sidebar {
    order: 1;
    position: static;
    margin-bottom: 24px;
  }

  .page-content {
    order: 2;
  }

  .page-info-sidebar,
  .page-info {
    order: 3;
    grid-column: auto;
    display: block;
    margin-top: 24px;
  }

  .page-info-sidebar .info-card,
  .page-info .info-card {
    position: static;
  }

  .sidebar-inner,
  .sidebar-card,
  .toc-card,
  .toc,
  .toc-nav,
  .sidebar-nav {
    position: static;
  }

  /* 内页标题区 */
  .page-title-area,
  .page-title-wrap {
    padding: 0 16px 16px;
  }

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

  /* 面包屑 */
  .breadcrumb-wrap {
    padding: 16px 16px 0;
  }

  /* 内容区块 */
  .content-section {
    margin-bottom: 32px;
  }

  .content-section h2 {
    font-size: 20px;
  }

  /* 服务矩阵 */
  .service-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .delivery-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 验收清单 */
  .acceptance-list {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* 节点网格 */
  .node-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 联系页 */
  .contact-hero {
    grid-template-columns: 1fr;
    padding: 24px;
    gap: 16px;
  }

  .steps-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  /* 复制链接 */
  .copy-link-box,
  .copy-box {
    flex-direction: column;
    align-items: stretch;
  }

  .copy-link-btn,
  .copy-button {
    width: 100%;
  }

  /* 相关链接 */
  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .footer-bottom {
    padding: 16px;
  }

  /* 内容媒体（首页第二张图） */
  .content-media-primary img {
    aspect-ratio: 16 / 9;
  }

  /* 内容导航 */
  .content-nav ul {
    flex-direction: column;
    gap: 8px;
  }
}

/* 小屏手机断点 390px */
@media (max-width: 390px) {
  .brand-name {
    font-size: 17px;
  }

  .header-inner {
    padding: 0 12px;
  }

  .hero-section,
  .section-block {
    padding-left: 16px;
    padding-right: 16px;
  }

  .service-card,
  .process-step,
  .step-item,
  .node-card,
  .prep-card {
    padding: 16px;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-marker {
    left: -24px;
    width: 12px;
    height: 12px;
  }

  .timeline-list {
    padding-left: 24px;
  }

  .timeline-list .timeline-marker {
    left: -24px;
    width: 12px;
    height: 12px;
  }

  .error-title {
    font-size: 56px;
  }
}

/* 打印样式 */
@media print {
  .site-header,
  .nav-toggle,
  .header-cta,
  .page-sidebar,
  .page-info-sidebar,
  .page-info,
  .footer-bottom,
  .related-links,
  .copy-section {
    display: none;
  }

  .site-main {
    padding: 0;
  }

  .layout-shell.sidebar-left,
  .page-layout.sidebar-left,
  body > .sidebar-left,
  body.sidebar-left {
    display: block;
    max-width: 100%;
    padding: 0;
  }

  .page-content {
    max-width: 100%;
  }

  .content-section {
    break-inside: avoid;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}