/* ==================================================
   隐云机场 - 第二套独立网站：静默侧轨系统
   Silent Lateral Track System Stylesheet
   ================================================== */

:root {
  --bg-main: #FAF9F6;
  --bg-white: #FFFFFF;
  --bg-secondary: #F2F0EB;
  --text-main: #202526;
  --text-body: #5A6264;
  --text-muted: #858B8D;
  --ink-blue: #364F59;
  --ink-blue-deep: #2B4149;
  --gray-green: #596C63;
  --gray-green-deep: #46574F;
  --sand-gold: #A47E58;
  --terracotta: #A96750;
  --light-blue-gray: #EDF1F2;
  --light-green-gray: #EEF1EE;
  --light-warm: #F5EFE7;
  --border-color: #E0DED8;
  --track-width: 200px;
  --content-max-width: 1360px;
  --reading-max-width: 800px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --line-height: 1.85;
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  color: var(--text-main);
  background-color: var(--bg-main);
  scroll-behavior: smooth;
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-color: var(--bg-main);
  color: var(--text-body);
  display: flex;
  flex-direction: column;
}

/* 链接基础样式 */
a {
  color: var(--ink-blue);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--sand-gold);
}

img, svg {
  vertical-align: middle;
}

/* ==================================================
   布局结构：Desktop 左侧窄轨 + 右侧大阅读画布
   ================================================== */
.site-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* Desktop 左侧静默轨道 */
.side-track {
  width: var(--track-width);
  flex-shrink: 0;
  height: 100vh;
  position: sticky;
  top: 0;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px 18px 24px;
  z-index: 100;
  overflow-y: auto;
}

.track-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.track-brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  text-decoration: none;
}

.brand-symbol {
  width: 22px;
  height: 22px;
  color: var(--ink-blue);
  flex-shrink: 0;
}

.brand-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-main);
}

.track-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  padding-left: 2px;
}

/* 轨道主导航 */
.track-nav {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex-grow: 1;
}

.track-nav-item {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-body);
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  line-height: 1.4;
}

.track-nav-item:hover {
  color: var(--text-main);
  border-left-color: var(--border-color);
}

.track-nav-item.active {
  color: var(--text-main);
  font-weight: 600;
  border-left-color: var(--ink-blue);
  background: transparent;
}

.track-num {
  font-size: 11px;
  color: var(--text-muted);
  margin-right: 6px;
  font-variant-numeric: tabular-nums;
}

/* 轨道底部商业 CTA */
.track-footer {
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.track-cta-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  background-color: var(--ink-blue);
  color: #FFFFFF !important;
  font-size: 13px;
  font-weight: 600;
  border-radius: 2px;
  letter-spacing: 0.02em;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.track-cta-btn:hover {
  background-color: var(--ink-blue-deep);
  transform: translateX(1px);
}

.track-cta-arrow {
  font-size: 14px;
  transition: transform 0.15s ease;
}

.track-cta-btn:hover .track-cta-arrow {
  transform: translateX(3px);
}

/* 右侧大型阅读画布 */
.main-canvas {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-main);
}

/* 顶部轻量工具栏 */
.canvas-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 44px;
  border-bottom: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
  background-color: var(--bg-main);
}

.topbar-location {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-location-badge {
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--gray-green);
  border-radius: 50%;
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.topbar-links a {
  color: var(--text-muted);
  font-size: 12px;
}

.topbar-links a:hover {
  color: var(--text-main);
}

/* 移动端顶部 Header 与 抽屉导航（Desktop 隐藏） */
.mobile-header,
.mobile-drawer {
  display: none;
}

/* 内容容器限制 */
.canvas-content-wrapper {
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 44px;
  flex-grow: 1;
}

/* ==================================================
   Hero 核心区域：大型阅读画布 + 三条超宽内容横条
   ================================================== */
.hero-canvas-block {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--border-color);
}

.hero-meta {
  font-size: 13px;
  color: var(--gray-green);
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.hero-brand-name {
  font-size: 58px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 14px;
}

.hero-headline {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 8px;
  white-space: pre-line;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--sand-gold);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-seo-h1 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink-blue);
  line-height: 1.5;
  margin-bottom: 18px;
  padding-left: 12px;
  border-left: 3px solid var(--ink-blue);
}

.hero-description {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-body);
  max-width: 860px;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  background-color: var(--ink-blue);
  color: #FFFFFF !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: 2px;
  letter-spacing: 0.02em;
  transition: all 0.15s ease;
}

.btn-primary:hover {
  background-color: var(--ink-blue-deep);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background-color: var(--bg-white);
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: 2px;
  transition: all 0.15s ease;
}

.btn-secondary:hover {
  border-color: var(--ink-blue);
  color: var(--ink-blue);
}

.btn-text-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-green);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
}

.btn-text-link:hover {
  color: var(--gray-green-deep);
}

/* Hero 三条超宽内容横条：逐级收缩 100% -> 92% -> 84% */
.hero-wide-bars {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.hero-bar:hover {
  border-color: var(--ink-blue);
  background-color: #FCFBF9;
}

.hero-bar-1 {
  width: 100%;
}

.hero-bar-2 {
  width: 92%;
}

.hero-bar-3 {
  width: 84%;
}

.bar-col-header {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 140px;
}

.bar-tag {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.bar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
}

.bar-col-detail {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-body);
  flex: 1;
  padding: 0 24px;
}

.bar-pills {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.bar-pill {
  display: inline-block;
  padding: 3px 10px;
  background-color: var(--bg-secondary);
  font-size: 12px;
  color: var(--text-main);
  border-radius: 2px;
}

.bar-col-action {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

/* ==================================================
   章节通用样式
   ================================================== */
.section-block {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header-compact {
  margin-bottom: 28px;
}

.section-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-green);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
}

.section-lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-body);
  max-width: 900px;
}

/* ==================================================
   01 / 套餐价格账页 (Pricing Ledger)
   ================================================== */
.pricing-ledger-wrapper {
  margin-top: 32px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
}

.pricing-ledger {
  display: flex;
  width: 100%;
}

.ledger-sidebar {
  width: 130px;
  flex-shrink: 0;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

.ledger-col-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ledger-col-head span {
  font-weight: 600;
  color: var(--text-main);
}

.ledger-note {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
}

.ledger-rows {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.ledger-row {
  display: grid;
  grid-template-columns: 46px 140px 120px 130px 1fr 140px;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.15s ease;
}

.ledger-row:last-child {
  border-bottom: none;
}

.ledger-row:hover {
  background-color: #FAF9F6;
}

/* 主力方案高亮：左侧 3px 灰绿，浅绿灰背景 */
.ledger-row.featured {
  background-color: var(--light-green-gray);
  border-left: 3px solid var(--gray-green);
  padding-left: 21px;
}

.ledger-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.ledger-plan-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-featured {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  background-color: var(--sand-gold);
  color: #FFFFFF;
  padding: 2px 7px;
  border-radius: 2px;
  line-height: 1.3;
}

.ledger-traffic {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-blue);
}

.ledger-price {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.ledger-price-sub {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-muted);
}

.ledger-purpose {
  font-size: 13px;
  color: var(--text-body);
}

.ledger-cta {
  text-align: right;
}

.btn-ledger-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: 2px;
  background-color: var(--bg-white);
  transition: all 0.15s ease;
}

.ledger-row.featured .btn-ledger-action {
  background-color: var(--gray-green);
  color: #FFFFFF !important;
  border-color: var(--gray-green);
}

.ledger-row.featured .btn-ledger-action:hover {
  background-color: var(--gray-green-deep);
}

.btn-ledger-action:hover {
  border-color: var(--ink-blue);
  color: var(--ink-blue);
}

/* 快速选择指导条 */
.ledger-quick-guide {
  margin-top: 20px;
  padding: 16px 20px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-body);
}

.quick-guide-items {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.quick-guide-item span {
  font-weight: 600;
  color: var(--text-main);
}

/* ==================================================
   02 / 节点地区阅读窗 (Region Reading Window)
   ================================================== */
.region-window-container {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 220px 1fr;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  min-height: 400px;
}

.region-tabs-bar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.region-tab-btn {
  background: none;
  border: none;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  padding: 20px 22px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
  width: 100%;
}

.region-tab-btn:hover {
  background-color: #FAF9F6;
}

.region-tab-btn.active {
  background-color: var(--bg-white);
  border-left-color: var(--ink-blue);
}

.tab-region-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  display: block;
  margin-bottom: 4px;
}

.tab-region-desc {
  font-size: 12px;
  color: var(--text-muted);
  display: block;
}

.region-reading-panes {
  padding: 36px 40px;
  background-color: var(--bg-white);
}

.region-pane {
  display: none;
}

.region-pane.active {
  display: block;
}

.region-pane-header {
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.region-pane-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.region-pane-core-text {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-main);
  background-color: var(--light-blue-gray);
  padding: 16px 20px;
  border-left: 3px solid var(--ink-blue);
  margin-bottom: 24px;
}

.region-grid-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 28px;
}

.detail-card {
  padding: 16px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.detail-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.detail-card-text {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.75;
}

.region-pane-links {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==================================================
   03 / 线路知识区 (Line Knowledge)
   ================================================== */
.line-ledger-grid {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.line-info-table-wrapper {
  margin-top: 24px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  overflow-x: auto;
}

.line-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.line-data-table th {
  background-color: var(--bg-secondary);
  padding: 16px 20px;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
}

.line-data-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-body);
  vertical-align: top;
  line-height: 1.7;
}

.line-data-table tr:last-child td {
  border-bottom: none;
}

.line-data-table td strong {
  color: var(--text-main);
}

.line-faq-box {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.line-faq-item {
  padding: 20px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.line-faq-q {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.line-faq-a {
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ==================================================
   04 & 05 / 平台资料行 (AI & Streaming Platform Rows)
   ================================================== */
.platform-rows-container {
  margin-top: 28px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
}

.platform-row {
  display: grid;
  grid-template-columns: 180px 1.2fr 1fr 140px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  transition: background-color 0.15s ease;
}

.platform-row:last-child {
  border-bottom: none;
}

.platform-row:hover {
  background-color: #FAF9F6;
}

.platform-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.platform-focus, .platform-region {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.7;
}

.platform-focus strong, .platform-region strong {
  color: var(--text-main);
  display: block;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.platform-link {
  text-align: right;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
}

/* ==================================================
   06 / 设备资料窗 (Device Info Window)
   ================================================== */
.device-window-container {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 200px 1fr;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  min-height: 440px;
}

.device-tabs-bar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.device-tab-btn {
  background: none;
  border: none;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  padding: 20px 22px;
  cursor: pointer;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  transition: all 0.15s ease;
}

.device-tab-btn:hover {
  background-color: #FAF9F6;
}

.device-tab-btn.active {
  background-color: var(--bg-white);
  border-left-color: var(--ink-blue);
}

.device-reading-panes {
  padding: 36px 40px;
  background-color: var(--bg-white);
}

.device-pane {
  display: none;
}

.device-pane.active {
  display: block;
}

.device-pane-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.device-pane-desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 24px;
}

.device-steps-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.device-step-item {
  display: flex;
  gap: 16px;
  padding: 14px 18px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.step-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-blue);
  flex-shrink: 0;
  margin-top: 2px;
}

.step-content strong {
  display: block;
  font-size: 14px;
  color: var(--text-main);
  margin-bottom: 4px;
}

.step-content p {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.7;
}

/* ==================================================
   07 / 隐云评测特别导引
   ================================================== */
.review-highlight-card {
  margin-top: 28px;
  padding: 32px 36px;
  background-color: var(--light-warm);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--sand-gold);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.review-highlight-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
}

.review-highlight-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.review-highlight-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.point-item {
  background-color: var(--bg-white);
  padding: 14px 18px;
  border: 1px solid var(--border-color);
  border-radius: 2px;
  font-size: 13px;
  line-height: 1.7;
}

.point-item strong {
  display: block;
  font-size: 14px;
  color: var(--text-main);
  margin-bottom: 4px;
}

/* ==================================================
   08 / 教程资料中心目录 (Documentation Catalog)
   ================================================== */
.doc-center-wrapper {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.doc-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.doc-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink-blue);
}

.doc-group-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-group-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--sand-gold);
  letter-spacing: 0.05em;
}

.doc-group-link {
  font-size: 13px;
  color: var(--ink-blue);
}

.doc-articles-table {
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
}

.doc-article-row {
  display: grid;
  grid-template-columns: 280px 1fr 100px 90px 100px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  transition: background-color 0.15s ease;
  gap: 16px;
}

.doc-article-row:last-child {
  border-bottom: none;
}

.doc-article-row:hover {
  background-color: #FAF9F6;
}

.doc-article-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
}

.doc-article-row:hover .doc-article-title {
  color: var(--ink-blue);
}

.doc-article-summary {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.6;
}

.doc-article-date, .doc-article-time {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.doc-article-action {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-blue);
  text-align: right;
  white-space: nowrap;
}

/* ==================================================
   09 / 网络排障问题目录 (Troubleshooting Directory)
   ================================================== */
.troubleshooting-container {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 240px 1fr;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  min-height: 480px;
}

.trouble-tabs-bar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.trouble-tab-btn {
  background: none;
  border: none;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  padding: 16px 20px;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
}

.trouble-tab-btn:hover {
  background-color: #FAF9F6;
}

.trouble-tab-btn.active {
  background-color: var(--bg-white);
  border-left-color: var(--ink-blue);
}

.trouble-tab-num {
  font-size: 11px;
  color: var(--text-muted);
}

.trouble-reading-panes {
  padding: 36px 40px;
  background-color: var(--bg-white);
}

.trouble-pane {
  display: none;
}

.trouble-pane.active {
  display: block;
}

.trouble-pane-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.trouble-pane-core {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-main);
  background-color: var(--light-blue-gray);
  padding: 16px 20px;
  border-left: 3px solid var(--ink-blue);
  margin-bottom: 24px;
}

.trouble-steps-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.trouble-step-item {
  padding: 14px 18px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  font-size: 13px;
  line-height: 1.75;
}

.trouble-step-item strong {
  display: block;
  font-size: 14px;
  color: var(--text-main);
  margin-bottom: 4px;
}

/* ==================================================
   10 / 常见问题 (FAQ Directory Accordion)
   ================================================== */
.faq-directory-wrapper {
  margin-top: 32px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
}

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

.faq-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: background-color 0.15s ease;
}

.faq-header:hover {
  background-color: #FAF9F6;
}

.faq-header-content {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex: 1;
}

.faq-q-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--sand-gold);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.faq-q-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
}

.faq-toggle-icon {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  margin-left: 16px;
}

.faq-item.open .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-body {
  display: none;
  padding: 0 28px 24px 58px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-body);
}

.faq-item.open .faq-body {
  display: block;
}

/* ==================================================
   Footer (紧凑浅暖底，只在右侧画布底部)
   ================================================== */
.canvas-footer {
  background-color: #F1EFEB;
  border-top: 1px solid var(--border-color);
  color: #4B5457;
  padding: 44px 44px 28px;
  font-size: 13px;
  line-height: 1.7;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 240px repeat(4, 1fr);
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.footer-brand-desc {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-col-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

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

.footer-links-list a {
  color: #4B5457;
  font-size: 13px;
}

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

.footer-bottom-bar {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

.friendly-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.friendly-links a {
  color: #4B5457;
}

.friendly-links a:hover {
  color: var(--ink-blue);
}

/* ==================================================
   文章详情页 (Article Detail Page)
   ================================================== */
.article-page-layout {
  display: grid;
  grid-template-columns: minmax(0, 820px) 240px;
  gap: 56px;
  padding: 44px 0 64px;
}

.article-main-body {
  min-width: 0;
}

.article-breadcrumbs {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

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

.article-breadcrumbs a:hover {
  color: var(--text-main);
}

.article-category-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-green);
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.article-h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 28px;
}

.article-quick-conclusion {
  background-color: var(--light-blue-gray);
  border-left: 3px solid var(--ink-blue);
  padding: 20px 24px;
  border-radius: 2px;
  margin-bottom: 36px;
}

.quick-conclusion-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-blue);
  margin-bottom: 8px;
}

.quick-conclusion-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-main);
}

.article-content {
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-body);
}

.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  line-height: 1.4;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

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

.article-content blockquote {
  border-left: 3px solid var(--sand-gold);
  padding: 14px 20px;
  background-color: var(--light-warm);
  margin: 24px 0;
  font-size: 15px;
  color: var(--text-body);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.article-content th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-main);
}

.article-related-box {
  margin-top: 48px;
  padding: 28px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.article-related-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

.article-related-list a {
  font-size: 14px;
  color: var(--ink-blue);
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-nav-prevnext {
  margin-top: 36px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.prevnext-link {
  font-size: 13px;
  color: var(--text-body);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.prevnext-label {
  font-size: 11px;
  color: var(--text-muted);
}

/* 文章右侧轻量目录 (TOC) */
.article-toc-aside {
  position: sticky;
  top: 32px;
  height: fit-content;
  padding: 20px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  font-size: 13px;
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list a {
  color: var(--text-body);
  line-height: 1.4;
  display: block;
}

.toc-list a:hover {
  color: var(--ink-blue);
}

/* ==================================================
   分类页样式 (Category Page)
   ================================================== */
.category-page-header {
  padding: 44px 0 32px;
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-main);
  margin: 12px 0 14px;
}

.category-description {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
  max-width: 860px;
}

.category-articles-list {
  margin: 36px 0 64px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
}

/* ==================================================
   静态信息页面 (About, Terms, Privacy, 404, Sitemap)
   ================================================== */
.static-page-container {
  padding: 44px 0 64px;
  max-width: 880px;
}

.static-h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.static-body {
  font-size: 15px;
  line-height: 1.95;
  color: var(--text-body);
}

.static-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 14px;
}

.static-body p {
  margin-bottom: 18px;
}

.static-body ul {
  margin: 0 0 20px 24px;
}

.static-body li {
  margin-bottom: 8px;
}

/* 404 页面特别布局 */
.error-page-box {
  padding: 64px 0;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

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

.error-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--text-body);
  margin-bottom: 32px;
  line-height: 1.8;
}

.error-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 24px;
  text-align: left;
}

.error-nav-item {
  padding: 12px 16px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  font-size: 13px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Sitemap 分组网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 32px;
}

.sitemap-group {
  padding: 24px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.sitemap-group-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-links a {
  font-size: 14px;
  color: var(--ink-blue);
}

/* ==================================================
   无脚本兼容状态 (No-JS Fallback)
   ================================================== */
.no-js .region-pane,
.no-js .device-pane,
.no-js .trouble-pane {
  display: block !important;
  margin-bottom: 32px;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 24px;
}

.no-js .region-tabs-bar,
.no-js .device-tabs-bar,
.no-js .trouble-tabs-bar {
  display: none !important;
}

.no-js .faq-body {
  display: block !important;
}

.no-js .region-window-container,
.no-js .device-window-container,
.no-js .troubleshooting-container {
  grid-template-columns: 1fr !important;
}

/* ==================================================
   移动端响应式 (Responsive Breakpoints: 1024, 768, 430, 390, 375)
   ================================================== */
@media (max-width: 1024px) {
  .hero-bar-2 {
    width: 96%;
  }
  .hero-bar-3 {
    width: 92%;
  }
  .article-page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .article-toc-aside {
    position: static;
    margin-bottom: 32px;
  }
  .doc-article-row {
    grid-template-columns: 240px 1fr 90px 90px;
  }
  .doc-article-action {
    display: none;
  }
  .footer-top-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  /* 取消左侧轨道，恢复顶部 Header */
  .site-layout {
    flex-direction: column;
  }

  .side-track {
    display: none !important;
  }

  .canvas-topbar {
    display: none;
  }

  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
  }

  .mobile-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-main);
    font-weight: 700;
    font-size: 16px;
  }

  .mobile-menu-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 6px 10px;
    font-size: 13px;
    font-family: inherit;
    color: var(--text-main);
    cursor: pointer;
  }

  .mobile-drawer {
    display: none;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
  }

  .mobile-drawer.open {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .mobile-drawer-link {
    font-size: 14px;
    color: var(--text-main);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    display: block;
  }

  .canvas-content-wrapper {
    padding: 0 20px;
  }

  .hero-brand-name {
    font-size: 38px;
  }

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

  .hero-wide-bars {
    gap: 10px;
  }

  .hero-bar-1, .hero-bar-2, .hero-bar-3 {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
  }

  .bar-col-detail {
    padding: 0;
  }

  /* 价格账页在移动端变为单列卡片式账单行 */
  .pricing-ledger {
    flex-direction: column;
  }

  .ledger-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 14px 16px;
  }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 16px;
  }

  .ledger-row.featured {
    padding-left: 14px;
  }

  .ledger-cta {
    text-align: left;
    margin-top: 6px;
  }

  /* 节点阅读窗与设备窗在移动端单列纵向展开 */
  .region-window-container,
  .device-window-container,
  .troubleshooting-container {
    grid-template-columns: 1fr;
  }

  .region-tabs-bar,
  .device-tabs-bar,
  .trouble-tabs-bar {
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .region-tab-btn,
  .device-tab-btn,
  .trouble-tab-btn {
    border-left: none;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    padding: 12px 16px;
  }

  .region-tab-btn.active,
  .device-tab-btn.active,
  .trouble-tab-btn.active {
    border-bottom-color: var(--ink-blue);
  }

  .region-reading-panes,
  .device-reading-panes,
  .trouble-reading-panes {
    padding: 24px 18px;
  }

  .region-grid-details,
  .line-faq-box,
  .review-highlight-points,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }

  /* 平台行移动端紧凑化 */
  .platform-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 18px 16px;
  }

  .platform-link {
    text-align: left;
  }

  /* 教程文章行移动端 */
  .doc-article-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px;
  }

  .canvas-footer {
    padding: 36px 20px 24px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 430px) {
  .hero-brand-name {
    font-size: 32px;
  }
  .hero-headline {
    font-size: 21px;
  }
  .section-title {
    font-size: 24px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-primary, .btn-secondary {
    justify-content: center;
  }
}

/* ==================================================
   动效与减弱动效偏好 (Prefers-Reduced-Motion)
   ================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 打印样式 */
@media print {
  .side-track, .canvas-topbar, .mobile-header, .track-footer, .hero-actions, .canvas-footer {
    display: none !important;
  }
  .main-canvas {
    width: 100% !important;
  }
}