/* ==========================================================================
   吃瓜网在线 - 全站样式表
   版本：1.0
   说明：本文件为整站统一样式，按 base、layout、components、pages、responsive 分组
   ========================================================================== */

/* ==========================================================================
   Base - 基础变量、重置与全局元素
   ========================================================================== */

:root {
  --color-primary: #0F4C81;
  --color-primary-dark: #0B3A63;
  --color-primary-light: #1A5C96;
  --color-bg: #F5F7FA;
  --color-card: #FFFFFF;
  --color-text: #1F2937;
  --color-text-secondary: #4B5563;
  --color-border: #D1D5DB;
  --color-accent: #F59E0B;
  --color-accent-light: #FEF3C7;
  --color-info-bg: #EFF6FF;
  --color-warning-bg: #FFFBEB;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 1em;
}

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

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-text-secondary);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background-color: var(--color-info-bg);
}

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

.toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-col h3 {
  font-size: 16px;
  margin-bottom: 16px;
  color: var(--color-text);
}

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

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

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

.footer-desc p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px 20px;
  text-align: center;
}

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

/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 20px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
}

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

/* 页面标题区 */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 20px 8px;
}

.page-title {
  font-size: 28px;
  color: var(--color-text);
  margin: 0;
}

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

/* 按钮 */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  text-align: center;
}

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

.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  background-color: transparent;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  text-align: center;
}

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

/* 提示框 */
.notice-box {
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
}

.notice-box h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.notice-box p {
  font-size: 15px;
  margin-bottom: 0.6em;
}

.notice-box p:last-child {
  margin-bottom: 0;
}

.notice-info {
  background-color: var(--color-info-bg);
  border-left: 4px solid var(--color-primary);
}

.notice-warning {
  background-color: var(--color-warning-bg);
  border-left: 4px solid var(--color-accent);
}

.tip-box {
  background-color: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
}

.tip-box h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.tip-box p {
  font-size: 15px;
  margin-bottom: 0;
}

/* 相关链接 */
.related-links {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.related-links ul {
  display: grid;
  gap: 8px;
}

.related-links a {
  display: inline-block;
  font-size: 15px;
  color: var(--color-primary);
  padding: 4px 0;
}

.related-links a:hover {
  text-decoration: underline;
}

.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: 12px;
}

.text-link:hover {
  text-decoration: underline;
}

/* 图片容器 */
.content-media {
  margin: 24px 0;
}

.content-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 8px 0 0;
  line-height: 1.5;
}

.content-media-inline {
  max-width: 720px;
  margin: 24px auto;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
}

.deliverable-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.deliverable-table th,
.deliverable-table td {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.deliverable-table th {
  background-color: var(--color-bg);
  font-weight: 600;
  white-space: nowrap;
}

.deliverable-table td {
  background-color: var(--color-card);
}

/* ==========================================================================
   Pages - 首页
   ========================================================================== */

/* 首屏 hero */
.hero-section {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 20px 64px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

/* 服务领域分类 */
.services-section {
  padding: 64px 20px;
  max-width: var(--container-width);
  margin: 0 auto;
}

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

.section-head h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-head p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.service-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(15, 76, 129, 0.08);
}

.card-figure {
  margin: 0 0 16px;
}

.card-figure img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.service-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

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

.card-link:hover {
  text-decoration: underline;
}

/* 首页主体布局 */
.home-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 64px;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}

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

/* 快速开始 */
.quickstart-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 32px;
}

.quickstart-section h2 {
  margin-bottom: 8px;
}

.quickstart-section > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.steps-list {
  display: grid;
  gap: 20px;
  counter-reset: step-counter;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.step-body h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.step-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 版本更新摘要 */
.versions-summary {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.versions-summary h2 {
  margin-bottom: 20px;
}

.version-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.version-item:last-of-type {
  border-bottom: none;
}

.version-tag {
  flex-shrink: 0;
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-info-bg);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.version-info h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.version-info p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 首页侧栏 */
.home-aside {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.home-aside h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.related-links {
  display: grid;
  gap: 12px;
}

.related-item {
  display: block;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

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

.related-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

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

.related-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Pages - 内页通用布局
   ========================================================================== */

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

/* 三栏文档布局：services / guide */
.layout-shell {
  display: grid;
  gap: 32px;
  margin: 24px 0 0;
  align-items: start;
}

.layout-shell.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr);
}

.layout-shell.sidebar-left .sidebar-right {
  display: none;
}

/* services 页三栏 */
.page-services .layout-shell.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr) 180px;
}

/* guide 页三栏 */
.page-guide .layout-shell.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr) 180px;
}

/* 左侧栏 */
.sidebar-left-inner,
.aside-left .aside-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 96px;
}

.sidebar-title {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

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

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

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

.sidebar-note h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.sidebar-note p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 右侧栏 */
.sidebar-right {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 96px;
}

.mini-toc .chapter-list a {
  font-size: 13px;
}

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

.page-title-area {
  margin-bottom: 24px;
}

.page-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* services 页内容 */
.service-intro {
  margin-bottom: 32px;
}

.service-hero-image {
  margin: 0 0 20px;
}

.service-hero-image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.service-category {
  margin-bottom: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.service-category:first-of-type {
  border-top: none;
  padding-top: 0;
}

.service-category h2 {
  margin-bottom: 12px;
}

.service-category p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.feature-list {
  margin-top: 16px;
  display: grid;
  gap: 8px;
}

.feature-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--color-text);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

/* 适用场景 */
.scene-guide {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.scene-guide > h2 {
  margin-bottom: 8px;
}

.scene-guide > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.scene-block {
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 16px;
}

.scene-block h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.scene-block p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* process 页 */
.page-process .layout-shell {
  grid-template-columns: minmax(0, 1fr) 220px;
}

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

.process-section {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.process-section:last-of-type {
  border-bottom: none;
}

.process-section .step-number {
  width: 36px;
  height: 36px;
  font-size: 16px;
  margin-bottom: 12px;
}

.process-section h2 {
  margin-bottom: 12px;
}

.process-section p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.process-figure {
  margin: 20px 0;
}

.process-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.process-figure figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 8px 0 0;
}

.deliverable-section {
  margin-top: 32px;
}

.deliverable-section h2 {
  margin-bottom: 8px;
}

.deliverable-section > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.page-toc .chapter-list a {
  font-size: 13px;
}

/* guide 页 */
.page-guide .content-article .page-title-wrap {
  margin-bottom: 24px;
}

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

.content-section {
  margin-bottom: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.content-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

.content-section > h2 {
  margin-bottom: 12px;
}

.content-section > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

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

.term-item {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.term-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.term-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.report-figure {
  margin: 20px 0;
}

.report-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.report-figure figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 8px 0 0;
}

.reading-steps {
  display: grid;
  gap: 16px;
}

.step-block {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.step-num {
  flex-shrink: 0;
  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-block h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.step-block p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.alert-flow {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

.alert-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.alert-tag {
  flex-shrink: 0;
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-warning-bg);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.alert-step h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.alert-step p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.action-list {
  display: grid;
  gap: 8px;
  margin-top: 8px;
}

.action-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
}

.action-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* guide 页右侧栏 */
.page-guide .aside-right .aside-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 96px;
}

.page-guide .aside-left .aside-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 96px;
}

.aside-card {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.aside-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.aside-card .related-links {
  display: grid;
  gap: 4px;
}

.aside-card .related-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.aside-card .related-links a:hover {
  color: var(--color-primary);
}

/* versions 页 */
.page-versions .page-title-area {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 8px 20px 0;
}

.page-versions .page-title-area p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0;
}

.versions-article {
  max-width: 860px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.versions-intro {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
  margin-bottom: 32px;
}

.versions-intro p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0;
}

.version-timeline {
  position: relative;
  padding-left: 40px;
}

.version-timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

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

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-marker::before {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 2px solid var(--color-card);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-marker .version-tag {
  margin-left: 20px;
  font-size: 12px;
}

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

.timeline-content h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0.5em;
}

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

.update-types {
  margin-top: 48px;
}

.update-types > h2 {
  margin-bottom: 8px;
}

.update-types > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.update-type-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.update-type-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.update-type-item h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.update-type-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.version-note {
  margin-top: 48px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 32px;
}

.version-note > h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

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

.version-note .related-links {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.version-note .related-links ul {
  display: grid;
  gap: 8px;
}

.version-note .related-links a {
  font-size: 14px;
}

/* terms 页 */
.page-terms .layout-single {
  max-width: 860px;
  margin: 24px auto 0;
  padding: 0 20px;
}

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

.page-title-block {
  margin-bottom: 24px;
}

.terms-hero-figure {
  margin: 0 0 32px;
}

.terms-hero-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.terms-section {
  margin-bottom: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.terms-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

.terms-section h2 {
  margin-bottom: 16px;
}

.terms-list {
  display: grid;
  gap: 16px;
  counter-reset: terms-counter;
}

.terms-item {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.terms-item h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.terms-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.terms-note {
  margin-top: 32px;
}

.related-link-list {
  display: grid;
  gap: 8px;
}

.related-link-list a {
  font-size: 14px;
}

/* faq 页 */
.page-faq .layout-shell.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr);
}

.page-faq .sidebar {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 96px;
}

.sidebar-nav h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

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

.sidebar-list a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
}

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

.page-faq .page-intro {
  margin-bottom: 24px;
}

.faq-section {
  margin-bottom: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.faq-section:first-of-type {
  border-top: none;
  padding-top: 0;
}

.faq-section h2 {
  margin-bottom: 16px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition-fast);
}

.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;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform var(--transition-base);
}

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

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 16px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
  padding-top: 8px;
}

.page-faq .related-links ul {
  display: grid;
  gap: 8px;
}

/* 404 页 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  min-height: 60vh;
}

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

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.error-help {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ==========================================================================
   Responsive - 响应式样式
   ========================================================================== */

@media (max-width: 1024px) {
  /* 服务页三栏改为两栏 */
  .page-services .layout-shell.sidebar-left,
  .page-guide .layout-shell.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .page-services .sidebar-right,
  .page-guide .aside-right {
    display: none;
  }

  /* 首页 hero 调整 */
  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-figure {
    max-width: 640px;
  }

  .home-layout {
    grid-template-columns: 1fr;
  }

  .home-aside {
    max-width: 640px;
  }
}

@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    min-height: 64px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    z-index: 99;
  }

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

  .nav-link {
    padding: 12px 24px;
    font-size: 16px;
    border-radius: 0;
  }

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

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

  /* 页面标题 */
  .page-header {
    padding-top: 12px;
  }

  /* 首页 */
  .hero-content {
    padding: 48px 20px 40px;
  }

  .hero-content h1 {
    font-size: 26px;
  }

  .services-section {
    padding: 40px 20px;
  }

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

  .home-layout {
    padding: 0 20px 48px;
  }

  .quickstart-section,
  .versions-summary,
  .home-aside {
    padding: 24px;
  }

  /* 内页布局全部改为单列 */
  .layout-shell.sidebar-left,
  .page-services .layout-shell.sidebar-left,
  .page-guide .layout-shell.sidebar-left,
  .page-faq .layout-shell.sidebar-left,
  .page-process .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 侧栏在移动端放置到内容之后 */
  .layout-shell > .sidebar-left-inner,
  .layout-shell > .sidebar-right,
  .page-guide .aside-left,
  .page-guide .aside-right,
  .page-faq .sidebar {
    order: 2;
    position: static;
  }

  .layout-shell > .content-area,
  .layout-shell > .content-article,
  .page-process .main-content,
  .page-faq .site-main {
    order: 1;
  }

  /* 内容区 */
  .content-area,
  .content-article,
  .page-process .main-content,
  .terms-article {
    padding: 24px;
  }

  /* 步骤列表 */
  .steps-list {
    gap: 16px;
  }

  /* 版本时间线 */
  .version-timeline {
    padding-left: 32px;
  }

  .timeline-marker {
    left: -32px;
  }

  /* 更新类型 */
  .update-type-list {
    grid-template-columns: 1fr;
  }

  /* 条款 */
  .terms-item {
    padding: 14px 16px;
  }

  /* faq */
  .faq-item summary {
    padding: 14px 16px;
    padding-right: 36px;
  }

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

  /* 表格 */
  .deliverable-table {
    font-size: 14px;
  }

  .deliverable-table th,
  .deliverable-table td {
    padding: 10px 12px;
  }

  /* 404 */
  .error-main {
    padding: 48px 20px;
  }

  .error-code {
    font-size: 48px;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 20px;
  }

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

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

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-secondary {
    text-align: center;
  }

  .service-card {
    padding: 20px;
  }

  .card-figure img {
    height: 140px;
  }

  .step-item {
    gap: 12px;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .timeline-content {
    padding: 16px;
  }

  .process-figure img,
  .report-figure img,
  .service-hero-image img {
    height: auto;
  }

  .alert-step,
  .step-block {
    padding: 14px 16px;
  }
}

/* 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;
  }
}