/* ==========================================================================
   宇宙云 专线路由图谱 - 视觉与版式样式表
   色彩配比：70% 暖白/米白 | 20% 深色文字 | 10% 路线蓝/橙/绿
   ========================================================================== */

:root {
  --bg-page: #F6F2EA;
  --bg-surface: #FCFBF7;
  --bg-white: #FFFFFF;
  --text-main: #1A1D20;
  --text-body: #4E5553;
  --text-muted: #7C817D;
  --route-blue: #2457D6;
  --route-orange: #DB6648;
  --route-green: #6D7D75;
  --route-blue-light: #EEF3FC;
  --route-orange-light: #FBEFEA;
  --border-color: #DDD8CE;
  --border-subtle: #ECE7DE;
  --footer-bg: #ECE7DE;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --container-max: 1160px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.68;
  font-size: 1rem;
  overflow-x: hidden;
  min-height: 100vh;
}

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

a:hover {
  color: #173fa8;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

/* 布局辅助 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section-padding {
  padding-top: 56px;
  padding-bottom: 56px;
}

/* 顶部导航 Header */
.site-header {
  height: 68px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-link {
  font-size: 0.92rem;
  color: var(--text-main);
  font-weight: 500;
  padding: 6px 2px;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--route-blue);
}

.nav-link.active {
  color: var(--route-blue);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--route-blue);
}

.header-action {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--route-blue);
  color: #FFFFFF;
  border-color: var(--route-blue);
}

.btn-primary:hover {
  background-color: #173fa8;
  border-color: #173fa8;
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-surface);
  border-color: var(--text-muted);
  color: var(--route-blue);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.85rem;
}

/* 移动端汉堡按钮 */
.menu-toggle {
  display: none;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 7px 12px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 移动端菜单折叠面板 */
.mobile-nav-panel {
  display: none;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 20px 24px;
}

.mobile-nav-panel.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-nav-link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  display: block;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border-subtle);
}

.mobile-nav-link.active {
  color: var(--route-blue);
  font-weight: 600;
}

/* 路线标签与徽章 */
.route-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  background-color: var(--route-blue-light);
  color: var(--route-blue);
  border: 1px solid rgba(36, 87, 214, 0.2);
  border-radius: 2px;
  letter-spacing: 0.02em;
}

.route-tag-orange {
  background-color: var(--route-orange-light);
  color: var(--route-orange);
  border-color: rgba(219, 102, 72, 0.25);
}

.route-tag-green {
  background-color: #F0F4F2;
  color: var(--route-green);
  border-color: rgba(109, 125, 117, 0.25);
}

/* 模块标题通用结构 */
.module-header {
  margin-bottom: 24px;
}

.module-number {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--route-blue);
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 6px;
}

.module-h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 8px;
}

.module-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 820px;
}

/* 路线卡片容器 */
.route-card-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px;
}

/* ==========================================================================
   首页 Hero: 线路总览 Hero
   ========================================================================== */
.hero-atlas {
  padding-top: 48px;
  padding-bottom: 48px;
  background-color: var(--bg-page);
  border-bottom: 1px solid var(--border-color);
}

.hero-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.hero-meta-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta-year {
  color: var(--route-blue);
  font-weight: 700;
}

.hero-brand {
  font-size: 52px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero-h1 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
}

.hero-slogan {
  font-size: 42px;
  font-weight: 700;
  color: var(--route-blue);
  line-height: 1.25;
  margin-bottom: 14px;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 860px;
  line-height: 1.75;
  margin-bottom: 24px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

/* 全链路示意图 (Hero 总路线) */
.atlas-diagram-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  margin-bottom: 24px;
}

.atlas-diagram-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.main-route-line-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  overflow-x: auto;
  padding: 10px 4px;
}

.route-step-node {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 140px;
  flex-shrink: 0;
  position: relative;
}

.step-node-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.step-node-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.step-node-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.route-arrow-svg {
  width: 28px;
  height: 18px;
  flex-shrink: 0;
}

/* 路线导航条目 (非卡片) */
.hero-route-index-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.route-index-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-main);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.route-index-item:hover {
  border-color: var(--route-blue);
  color: var(--route-blue);
}

.route-idx-no {
  font-weight: 700;
  color: var(--route-blue);
  font-size: 0.8rem;
}

/* ==========================================================================
   02 / 宇宙云是什么 (GEO 直答)
   ========================================================================== */
.geo-answer-lead {
  font-size: 1.08rem;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.75;
  background-color: var(--bg-white);
  border-left: 3px solid var(--route-blue);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 20px;
}

.features-matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.matrix-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 18px;
  border-radius: var(--radius-sm);
}

.matrix-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.matrix-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==========================================================================
   03 / 全球节点路线
   ========================================================================== */
.region-route-chain {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 20px 0;
}

.region-route-row {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 24px;
}

.region-name-badge {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--route-blue);
  min-width: 100px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.region-nodes-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.node-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
}

.node-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--route-blue);
}

.route-arrow-down {
  align-self: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  line-height: 1;
}

/* ==========================================================================
   04 / AI 工具路线 & 05 / 流媒体路线
   ========================================================================== */
.app-track-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 20px 0;
}

.app-track-row {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.app-track-label {
  display: flex;
  flex-direction: column;
  min-width: 140px;
}

.app-track-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.app-track-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.app-items-flex {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.app-pill {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.disclaimer-note {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 12px;
  padding: 10px 14px;
  background-color: var(--bg-white);
  border-left: 2px solid var(--route-green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ==========================================================================
   06 / 客户端使用路线
   ========================================================================== */
.client-route-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 20px 0;
  overflow-x: auto;
  padding: 10px 0;
}

.client-step-node {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  flex: 1;
  min-width: 160px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.client-platforms-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-color);
}

.platform-chip {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   07 / 套餐价格路线 (流量阶梯路线图谱)
   ========================================================================== */
.pricing-route-container {
  margin: 24px 0;
}

.pricing-route-stepper {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  position: relative;
  margin-bottom: 24px;
}

.pricing-tier-node {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 330px;
}

.pricing-tier-node.featured-tier {
  border-color: var(--route-blue);
  box-shadow: 0 4px 12px rgba(36, 87, 214, 0.08);
}

.pricing-top-strip {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 12px;
}

.tier-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

.tier-recommend-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--route-blue);
  padding: 2px 7px;
  border-radius: 2px;
  white-space: nowrap;
}

.tier-recommend-badge-orange {
  background-color: var(--route-orange);
}

.tier-price-box {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.tier-price-val {
  font-size: 38px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.tier-price-unit {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.tier-traffic-val {
  font-size: 26px;
  font-weight: 700;
  color: var(--route-blue);
  line-height: 1.2;
  margin-top: 6px;
}

.tier-equiv-val {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.tier-suit-list {
  font-size: 0.85rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.tier-period-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 4px 6px;
  background-color: var(--bg-surface);
  border-radius: 2px;
}

.common-features-strip {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 18px;
}

.common-feature-item {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   08 / 不限时套餐 (独立分支路线)
   ========================================================================== */
.branch-route-container {
  margin: 24px 0;
}

.branch-route-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.branch-tier-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.branch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.branch-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.branch-traffic {
  font-size: 28px;
  font-weight: 700;
  color: var(--route-orange);
  line-height: 1.2;
  margin-top: 4px;
}

.branch-detail-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.88rem;
  color: var(--text-body);
  margin: 16px 0;
  padding-left: 0;
}

.branch-detail-list li::before {
  content: "•";
  color: var(--route-blue);
  font-weight: bold;
  display: inline-block;
  width: 1em;
}

/* ==========================================================================
   文章手册目录与列表
   ========================================================================== */
.manual-index-table {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 20px 0;
}

.manual-index-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-fast);
}

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

.manual-index-item:hover {
  background-color: var(--bg-surface);
}

.manual-left-col {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
}

.manual-no {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--route-blue);
  min-width: 28px;
}

.manual-title-link {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
}

.manual-title-link:hover {
  color: var(--route-blue);
}

.manual-right-col {
  display: flex;
  align-items: center;
  gap: 16px;
}

.manual-category {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   文章阅读页面 (线路阅读器)
   ========================================================================== */
.page-container {
  padding-top: 36px;
  padding-bottom: 60px;
}

.breadcrumb-nav {
  margin-bottom: 20px;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.breadcrumb-item a:hover {
  color: var(--route-blue);
}

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

.breadcrumb-item.current {
  color: var(--text-main);
  font-weight: 600;
}

.article-header {
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.article-h1 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 14px;
}

.article-lead {
  font-size: 1.1rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 16px;
}

.article-author-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 快速结论盒子 */
.quick-conclusion-box {
  background-color: var(--route-blue-light);
  border: 1px solid rgba(36, 87, 214, 0.2);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin-bottom: 28px;
}

.conclusion-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--route-blue);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.conclusion-body {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.7;
}

/* 本文目录盒子 */
.article-toc-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin-bottom: 32px;
}

.toc-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 18px;
}

.toc-item a {
  font-size: 0.9rem;
  color: var(--text-body);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toc-item a:hover {
  color: var(--route-blue);
}

.toc-num {
  font-weight: 700;
  color: var(--route-blue);
  font-size: 0.82rem;
}

/* 文章正文排版 */
.article-prose {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.8;
}

.article-prose h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  line-height: 1.35;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 28px;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-prose p {
  margin-bottom: 18px;
}

.article-prose ul, .article-prose ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-prose li {
  margin-bottom: 8px;
}

.article-prose blockquote {
  background-color: var(--bg-surface);
  border-left: 3px solid var(--route-blue);
  padding: 14px 18px;
  margin: 22px 0;
  font-style: normal;
  color: var(--text-main);
}

/* 正文数据表格 */
.prose-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
}

.prose-table th, .prose-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
}

.prose-table th {
  background-color: var(--bg-surface);
  font-weight: 700;
  color: var(--text-main);
}

/* 相关阅读网格 */
.related-articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
}

/* ==========================================================================
   12 / 常见问题 FAQ (手风琴)
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 20px 0;
}

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

.faq-item.active {
  border-color: var(--route-blue);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 20px;
  font-family: inherit;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-question-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-no {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--route-blue);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--route-blue);
}

.faq-answer {
  display: none;
  padding: 0 20px 18px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   13 / 页脚 Footer (暖白米灰, 250px-320px)
   ========================================================================== */
.site-footer {
  background-color: var(--footer-bg);
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
  padding-bottom: 32px;
  color: var(--text-body);
  font-size: 0.88rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 28px;
  margin-bottom: 28px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.footer-col-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: var(--text-body);
}

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

.footer-bottom-bar {
  border-top: 1px solid rgba(221, 216, 206, 0.6);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-rec-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-rec-links a {
  color: var(--text-muted);
}

.footer-rec-links a:hover {
  color: var(--route-blue);
}

/* ==========================================================================
   响应式断点适配 (1024 / 768 / 430 / 390 / 375)
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-route-stepper {
    grid-template-columns: repeat(3, 1fr);
  }
  .features-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-brand {
    font-size: 38px;
  }
  .hero-slogan {
    font-size: 30px;
  }
  .hero-h1 {
    font-size: 1.25rem;
  }
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: inline-block;
  }
  .pricing-route-stepper {
    grid-template-columns: 1fr;
  }
  .branch-route-grid {
    grid-template-columns: 1fr;
  }
  .features-matrix-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .related-articles-grid {
    grid-template-columns: 1fr;
  }
  .toc-list {
    grid-template-columns: 1fr;
  }
  .main-route-line-layout {
    flex-direction: column;
    align-items: stretch;
  }
  .route-arrow-svg {
    transform: rotate(90deg);
    align-self: center;
    margin: 4px 0;
  }
  .client-route-layout {
    flex-direction: column;
    align-items: stretch;
  }
  .manual-index-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .manual-right-col {
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 430px) {
  .hero-brand {
    font-size: 32px;
  }
  .hero-slogan {
    font-size: 24px;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .pricing-tier-node {
    padding: 16px 14px;
  }
  .tier-price-val {
    font-size: 32px;
  }
  .tier-traffic-val {
    font-size: 22px;
  }
}