/* ==================================================
   SuperBiu 机场 · 第2套折页导航系统全局样式表
   主题：折页导航系统 / 品牌手册感
   配色：暖白(#FBFAF6)、深蓝灰(#344B55)、灰绿(#617568)、米金(#AD8058)、陶土(#B97050)
   ================================================== */

:root {
  --bg-primary: #FBFAF6;
  --bg-white: #FFFFFF;
  --bg-secondary: #F4F1EA;
  --bg-tertiary: #F0ECE5;
  --bg-featured: #F0F3EF;
  --bg-subtle-blue: #EEF2F3;
  --bg-subtle-green: #F0F2EE;
  --bg-subtle-warm: #F6EFE7;

  --text-main: #1E2528;
  --text-body: #5C6467;
  --text-muted: #898F91;
  --text-light: #A4AAA7;

  --color-blue-black: #435F6B;
  --color-blue-gray: #344B55;
  --color-gray-green: #617568;
  --color-deep-green: #4D5F54;
  --color-rice-gold: #AD8058;
  --color-terracotta: #B97050;

  --border-light: #E4DFD5;
  --border-focus: #AD8058;

  --shadow-subtle: 0 2px 6px rgba(30, 37, 40, 0.04);
  --shadow-sheet: 0 4px 16px rgba(30, 37, 40, 0.06);
  --shadow-hover: 0 8px 24px rgba(30, 37, 40, 0.09);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --line-height-body: 1.85;

  --container-max: 1180px;
  --article-max: 820px;
  --header-height: 72px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem; /* 17px */
  line-height: var(--line-height-body);
  background-color: var(--bg-primary);
  color: var(--text-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  overflow-wrap: break-word;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease;
}

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

/* 标题基础 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1.25rem;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  padding-left: 1.35rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.article-container {
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
}

/* 折角通用类 */
.fold-corner {
  position: relative;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
}

.fold-corner::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 12px 12px 0;
  border-color: transparent var(--bg-primary) transparent transparent;
  pointer-events: none;
  z-index: 2;
}

.fold-corner::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 12px 12px;
  border-color: transparent transparent var(--border-light) transparent;
  pointer-events: none;
  z-index: 3;
}

/* 章节顶部通用头 */
.chapter-header {
  margin-bottom: 2.25rem;
  position: relative;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-light);
}

.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-rice-gold);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.65rem;
  background-color: var(--bg-subtle-warm);
  border-left: 2px solid var(--color-rice-gold);
}

.chapter-header h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.35rem);
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.85rem;
}

.chapter-lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 860px;
}

/* 按钮规范 */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--color-blue-gray);
  color: #FFFFFF;
  padding: 0.75rem 1.65rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 0;
  border: 1px solid var(--color-blue-gray);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-cta:hover {
  background-color: var(--color-rice-gold);
  border-color: var(--color-rice-gold);
  color: #FFFFFF;
}

.btn-cta .btn-arrow {
  transition: transform 0.2s ease;
  font-family: inherit;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background-color: transparent;
  color: var(--text-main);
  padding: 0.75rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--border-light);
  transition: all 0.2s ease;
  white-space: nowrap;
}

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

/* ==================================================
   Header 导航栏
   ================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-logo-svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav-link {
  font-size: 0.925rem;
  color: var(--text-body);
  font-weight: 400;
  position: relative;
  padding: 0.4rem 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.nav-link.active::after,
.nav-link:hover::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-rice-gold);
}

.header-cta-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border-light);
  background-color: var(--bg-white);
}

/* 移动端菜单抽屉 */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 99;
}

.mobile-nav-drawer.is-open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-list a {
  display: block;
  padding: 0.85rem 1rem;
  font-size: 1.05rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
}

.mobile-nav-cta {
  margin-top: 1.5rem;
}

/* ==================================================
   Hero 折页导航板
   ================================================== */
.hero-section {
  padding: 3.5rem 0 3.5rem;
  position: relative;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
}

.hero-header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.hero-handbook-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-rice-gold);
  background-color: var(--bg-subtle-warm);
  padding: 0.2rem 0.65rem;
  border-left: 2px solid var(--color-rice-gold);
}

.hero-brand-name {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-headline {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 650;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-subhead {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-gray-green);
  margin-bottom: 1.25rem;
}

.hero-h1 {
  font-size: 1.1rem;
  color: var(--text-main);
  font-weight: 600;
  padding: 0.6rem 0.9rem;
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--color-blue-gray);
  margin-bottom: 1.25rem;
}

.hero-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-body);
  max-width: 820px;
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3.25rem;
}

/* 5个大型章节页签 (Desktop) */
.hero-tabs-wrap {
  position: relative;
  margin-top: 1rem;
}

.hero-tabs-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.85rem;
  position: relative;
}

.hero-tab-item {
  display: block;
  padding: 1.35rem 1.15rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-subtle);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  text-decoration: none;
}

/* 错层层级与微重叠 */
.hero-tab-item[data-tab="01"] {
  transform: translateY(0);
  z-index: 5;
  border-top: 3px solid var(--color-rice-gold);
}

.hero-tab-item[data-tab="02"] {
  transform: translateY(8px);
  z-index: 2;
  border-top: 3px solid var(--color-blue-gray);
}

.hero-tab-item[data-tab="03"] {
  transform: translateY(-4px);
  z-index: 4;
  border-top: 3px solid var(--color-gray-green);
}

.hero-tab-item[data-tab="04"] {
  transform: translateY(12px);
  z-index: 1;
  border-top: 3px solid var(--color-terracotta);
}

.hero-tab-item[data-tab="05"] {
  transform: translateY(-2px);
  z-index: 3;
  border-top: 3px solid var(--color-blue-black);
}

.hero-tab-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-rice-gold);
}

.hero-tab-item[data-tab="01"]:hover { transform: translateY(-3px); }
.hero-tab-item[data-tab="02"]:hover { transform: translateY(5px); }
.hero-tab-item[data-tab="03"]:hover { transform: translateY(-7px); }
.hero-tab-item[data-tab="04"]:hover { transform: translateY(9px); }
.hero-tab-item[data-tab="05"]:hover { transform: translateY(-5px); }

.tab-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-rice-gold);
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.tab-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.tab-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.tab-arrow {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-rice-gold);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==================================================
   Section 01: 套餐折页
   ================================================== */
.plans-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.plans-sheet-wrap {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}

.plan-sheet-row {
  display: grid;
  grid-template-columns: 80px 1fr 180px 240px 160px;
  align-items: center;
  padding: 1.65rem 2rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-subtle);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  position: relative;
}

.plan-sheet-row:hover {
  box-shadow: var(--shadow-sheet);
  border-color: var(--color-rice-gold);
}

/* 03主力方案 - 唯一主推 */
.plan-sheet-row.featured-plan {
  background-color: var(--bg-featured);
  border-left: 3px solid var(--color-gray-green);
  border-top-color: var(--color-gray-green);
  border-bottom-color: var(--color-gray-green);
  border-right-color: var(--color-gray-green);
}

.plan-sheet-idx {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-rice-gold);
  letter-spacing: 0.05em;
}

.plan-sheet-name-col {
  padding-right: 1.5rem;
}

.plan-name-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.25rem;
}

.plan-sheet-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.plan-badge-featured {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--color-terracotta);
  padding: 0.15rem 0.55rem;
}

.plan-badge-standby {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-blue-gray);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 0.15rem 0.55rem;
}

.plan-sheet-traffic {
  font-size: 0.95rem;
  color: var(--color-deep-green);
  font-weight: 600;
}

.plan-sheet-price-col {
  padding-right: 1.5rem;
}

.plan-price-num {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.plan-price-unit {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-sheet-scene-col {
  font-size: 0.925rem;
  color: var(--text-body);
  line-height: 1.6;
  padding-right: 1.5rem;
}

.plan-sheet-action-col {
  text-align: right;
}

.plan-quick-nav {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.quick-nav-item {
  font-size: 0.925rem;
  color: var(--text-body);
}

.quick-nav-item strong {
  color: var(--text-main);
  display: block;
  margin-bottom: 0.25rem;
}

/* ==================================================
   Section 02: 地区节点
   ================================================== */
.nodes-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.nodes-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.nodes-tabs-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.node-tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.25rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  transition: all 0.18s ease;
}

.node-tab-btn .node-tab-idx {
  font-size: 0.85rem;
  color: var(--color-rice-gold);
}

.node-tab-btn:hover,
.node-tab-btn.is-active {
  background-color: var(--bg-subtle-warm);
  border-color: var(--color-rice-gold);
  border-left: 3px solid var(--color-rice-gold);
}

.nodes-content-area {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  padding: 2.25rem;
  box-shadow: var(--shadow-subtle);
}

/* 无论JS是否启用，无JS时全部顺序显示；有JS时受JS控制 */
.node-content-pane {
  display: block;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.node-content-pane:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.js-tabs-active .node-content-pane {
  display: none;
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.js-tabs-active .node-content-pane.is-active {
  display: block;
}

.node-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-light);
}

.node-pane-title {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text-main);
}

.node-pane-badge {
  font-size: 0.85rem;
  color: var(--color-gray-green);
  background-color: var(--bg-subtle-green);
  padding: 0.2rem 0.65rem;
}

.node-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.node-info-block {
  padding: 1.25rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
}

.node-info-block h4 {
  font-size: 0.95rem;
  color: var(--color-blue-gray);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.node-info-block p {
  font-size: 0.925rem;
  color: var(--text-body);
  margin-bottom: 0;
}

.node-related-link {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.925rem;
}

/* ==================================================
   Section 03: 线路知识表格
   ================================================== */
.lines-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.chapter-table-wrap {
  overflow-x: auto;
  margin-top: 2rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-subtle);
}

.chapter-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.chapter-table th {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  font-weight: 600;
  padding: 1.15rem 1.35rem;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

.chapter-table td {
  padding: 1.25rem 1.35rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-body);
  line-height: 1.7;
}

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

.chapter-table tr:hover td {
  background-color: var(--bg-subtle-warm);
}

.table-idx-code {
  font-family: inherit;
  font-weight: 600;
  color: var(--color-rice-gold);
}

.lines-faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.lines-faq-card {
  padding: 1.5rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
}

.lines-faq-card h3 {
  font-size: 1.1rem;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.lines-faq-card p {
  font-size: 0.925rem;
  color: var(--text-body);
  margin-bottom: 0;
}

/* ==================================================
   Section 04: AI与流媒体
   ================================================== */
.ai-stream-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.subchapter-block {
  margin-top: 2.5rem;
}

.subchapter-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.subchapter-badge {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-blue-gray);
  background-color: var(--bg-subtle-blue);
  padding: 0.2rem 0.65rem;
}

.subchapter-title-wrap h3 {
  font-size: 1.45rem;
  color: var(--text-main);
}

.handbook-list {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-subtle);
}

.handbook-list-item {
  display: grid;
  grid-template-columns: 70px 180px 1fr 1fr 130px;
  align-items: center;
  padding: 1.25rem 1.65rem;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.925rem;
  gap: 1rem;
}

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

.handbook-list-item:hover {
  background-color: var(--bg-subtle-warm);
}

.item-code {
  font-weight: 700;
  color: var(--color-rice-gold);
}

.item-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-main);
}

.item-factor {
  color: var(--text-body);
}

.item-direction {
  color: var(--color-deep-green);
}

.item-action {
  text-align: right;
}

/* ==================================================
   Section 05: 客户端使用手册
   ================================================== */
.clients-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.clients-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.clients-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.client-tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.25rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  transition: all 0.18s ease;
}

.client-tab-btn:hover,
.client-tab-btn.is-active {
  background-color: var(--bg-subtle-warm);
  border-color: var(--color-rice-gold);
  border-left: 3px solid var(--color-rice-gold);
}

.clients-content-area {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  padding: 2.25rem;
  box-shadow: var(--shadow-subtle);
}

.client-content-pane {
  display: block;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.client-content-pane:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.js-clients-active .client-content-pane {
  display: none;
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.js-clients-active .client-content-pane.is-active {
  display: block;
}

.client-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-light);
}

.client-pane-title {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text-main);
}

.client-steps-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.client-step-card {
  padding: 1.15rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
}

.client-step-card h4 {
  font-size: 0.95rem;
  color: var(--color-blue-gray);
  margin-bottom: 0.35rem;
}

.client-step-card p {
  font-size: 0.875rem;
  color: var(--text-body);
  margin-bottom: 0;
}

/* ==================================================
   Section 06: SuperBiu评测章节
   ================================================== */
.review-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
}

.review-card-sheet {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  padding: 2.75rem;
  box-shadow: var(--shadow-sheet);
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3rem;
  align-items: center;
}

.review-sheet-main h3 {
  font-size: 1.85rem;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.review-sheet-main p {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.review-highlight-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.review-highlight-list li {
  font-size: 0.925rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.review-highlight-list li::before {
  content: "✓";
  color: var(--color-gray-green);
  font-weight: 700;
}

.review-sheet-side {
  background-color: var(--bg-subtle-warm);
  border: 1px solid var(--border-light);
  padding: 1.75rem;
  text-align: center;
}

.review-side-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.review-side-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

/* ==================================================
   Section 07: 教程目录
   ================================================== */
.tutorials-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.tutorial-chapter-group {
  margin-top: 2.25rem;
}

.tut-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--color-rice-gold);
  margin-bottom: 0.75rem;
}

.tut-group-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.tut-group-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tut-items-list {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
}

.tut-item-row {
  display: grid;
  grid-template-columns: 60px 1fr 120px 140px;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
  color: inherit;
  transition: background-color 0.18s ease;
}

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

.tut-item-row:hover {
  background-color: var(--bg-subtle-warm);
}

.tut-item-code {
  font-weight: 700;
  color: var(--color-rice-gold);
}

.tut-item-main h4 {
  font-size: 1.05rem;
  color: var(--text-main);
  margin-bottom: 0.25rem;
  transition: color 0.18s ease;
}

.tut-item-row:hover .tut-item-main h4 {
  color: var(--color-rice-gold);
}

.tut-item-main p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.tut-item-time {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tut-item-action {
  text-align: right;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-rice-gold);
}

/* ==================================================
   Section 08: 网络排障手册
   ================================================== */
.trouble-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

.trouble-list-wrap {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  margin-top: 2rem;
  box-shadow: var(--shadow-subtle);
}

.trouble-list-row {
  display: grid;
  grid-template-columns: 90px 180px 1fr 140px;
  align-items: center;
  padding: 1.35rem 1.65rem;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
  gap: 1.25rem;
}

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

.trouble-list-row:hover {
  background-color: var(--bg-subtle-warm);
}

.trouble-idx {
  font-weight: 700;
  color: var(--color-terracotta);
}

.trouble-item-name {
  font-weight: 600;
  color: var(--text-main);
  font-size: 1.05rem;
}

.trouble-item-desc {
  color: var(--text-body);
  line-height: 1.7;
}

.trouble-item-action {
  text-align: right;
}

/* ==================================================
   Section 09: FAQ 章节页
   ================================================== */
.faq-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-secondary);
}

.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 2rem;
}

.faq-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  transition: border-color 0.18s ease;
}

.faq-item[open] {
  border-color: var(--color-rice-gold);
}

.faq-item summary {
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-q-wrap {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.faq-q-code {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-rice-gold);
  background-color: var(--bg-subtle-warm);
  padding: 0.15rem 0.5rem;
}

.faq-icon-toggle {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  line-height: 1;
}

.faq-item[open] .faq-icon-toggle {
  transform: rotate(45deg);
  color: var(--color-rice-gold);
}

.faq-answer-body {
  padding: 0 1.5rem 1.35rem 1.5rem;
  border-top: 1px dashed var(--border-light);
  margin-top: 0.25rem;
  padding-top: 1rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-body);
}

/* ==================================================
   Footer 页脚
   ================================================== */
.site-footer {
  background-color: var(--bg-tertiary);
  color: #4C5457;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.925rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
  gap: 2rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.footer-brand-col h3 {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--color-rice-gold);
  display: inline-block;
  padding-bottom: 0.25rem;
}

.footer-links-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links-list a {
  color: #5C6467;
  transition: color 0.18s ease;
}

.footer-links-list a:hover {
  color: var(--color-rice-gold);
}

.footer-cta-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
}

.footer-cta-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-friendly-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-friendly-links a {
  color: #5C6467;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-friendly-links a:hover {
  color: var(--color-rice-gold);
}

/* ==================================================
   文章与分类页面通用排版样式
   ================================================== */
.page-hero {
  padding: 3rem 0 2rem;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

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

.breadcrumb-nav a:hover {
  color: var(--color-rice-gold);
}

.page-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 650;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 0.75rem 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* 快速结论 GEO Box */
.geo-conclusion-box {
  background-color: var(--bg-subtle-warm);
  border-left: 4px solid var(--color-rice-gold);
  padding: 1.35rem 1.5rem;
  margin: 1.75rem 0 2.25rem 0;
}

.geo-conclusion-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-rice-gold);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.geo-conclusion-text {
  font-size: 1.025rem;
  line-height: 1.8;
  color: var(--text-main);
  margin-bottom: 0;
}

/* 文章主体排版 */
.article-main-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 3rem;
  padding: 3rem 0 5rem;
}

.article-content-body {
  max-width: var(--article-max);
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  padding: 2.75rem;
  box-shadow: var(--shadow-subtle);
}

.article-content-body h2 {
  font-size: 1.75rem;
  color: var(--text-main);
  margin-top: 2.75rem;
  margin-bottom: 1.15rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.article-content-body h3 {
  font-size: 1.35rem;
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 0.85rem;
}

.article-content-body p {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text-body);
  margin-bottom: 1.35rem;
}

.article-content-body strong {
  color: var(--text-main);
}

.article-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  align-self: start;
}

.toc-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
  padding: 1.25rem;
  font-size: 0.875rem;
}

.toc-title {
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.toc-list a {
  color: var(--text-body);
  display: block;
  line-height: 1.5;
}

.toc-list a:hover {
  color: var(--color-rice-gold);
}

.article-nav-links {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.95rem;
}

.related-articles-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.related-articles-title {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.related-list li {
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 分类页文章列表 */
.category-article-list {
  display: flex;
  flex-direction: column;
  margin-top: 2rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-light);
}

.category-article-item {
  padding: 2rem 2.25rem;
  border-bottom: 1px solid var(--border-light);
}

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

.category-article-item:hover {
  background-color: var(--bg-subtle-warm);
}

.cat-item-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.cat-item-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-rice-gold);
}

.cat-item-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.category-article-item h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.category-article-item p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 1rem;
}

/* ==================================================
   响应式媒体查询
   覆盖：1024px, 768px, 430px, 390px, 375px
   ================================================== */
@media (max-width: 1024px) {
  .hero-tabs-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .plan-sheet-row {
    grid-template-columns: 60px 1fr 140px 1fr;
    gap: 1rem;
  }

  .plan-sheet-action-col {
    grid-column: span 4;
    text-align: left;
    margin-top: 0.5rem;
  }

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

  .review-card-sheet {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .article-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .desktop-nav,
  .header-cta-wrap .btn-cta {
    display: none;
  }

  .menu-toggle {
    display: inline-block;
  }

  .hero-section {
    padding: 2.25rem 0 2.5rem;
  }

  /* 移动端 5个章节页签转纵向清晰列表 */
  .hero-tabs-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .hero-tab-item {
    transform: none !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
  }

  .hero-tab-item .tab-arrow {
    margin-top: 0;
  }

  /* 移动端 套餐折页单列流及指定顺序 (主力方案 -> 日常方案 -> 轻享方案 -> 高频方案 -> 长期方案) */
  .plans-sheet-wrap {
    display: flex;
    flex-direction: column;
  }

  .plan-sheet-row.featured-plan {
    order: 1;
  }

  .plan-sheet-row:nth-child(2) {
    order: 2;
  }

  .plan-sheet-row:nth-child(1) {
    order: 3;
  }

  .plan-sheet-row:nth-child(4) {
    order: 4;
  }

  .plan-sheet-row:nth-child(5) {
    order: 5;
  }

  .plan-sheet-row {
    grid-template-columns: 1fr;
    gap: 0.85rem;
    padding: 1.35rem 1.25rem;
  }

  .plan-sheet-idx {
    display: inline-block;
    margin-bottom: 0.25rem;
  }

  .plan-sheet-action-col {
    grid-column: span 1;
    text-align: left;
  }

  /* 移动端 地区与客户端改为单列纵向 */
  .nodes-layout,
  .clients-layout {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .nodes-content-area,
  .clients-content-area {
    padding: 1.35rem;
  }

  .node-info-grid,
  .client-steps-list,
  .lines-faq-grid {
    grid-template-columns: 1fr;
  }

  /* 移动端 AI & 流媒体列表转单列 */
  .handbook-list-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.15rem 1.25rem;
  }

  .handbook-list-item .item-action {
    text-align: left;
    margin-top: 0.35rem;
  }

  /* 移动端 教程列表转单列 */
  .tut-item-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.15rem 1.25rem;
  }

  .tut-item-row .tut-item-action {
    text-align: left;
    margin-top: 0.35rem;
  }

  /* 移动端 排障列表转单列 */
  .trouble-list-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.15rem 1.25rem;
  }

  .trouble-list-row .trouble-item-action {
    text-align: left;
    margin-top: 0.35rem;
  }

  .article-content-body {
    padding: 1.5rem 1.25rem;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

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

@media (max-width: 430px) {
  html {
    font-size: 15px;
  }

  .chapter-header h2 {
    font-size: 1.65rem;
  }

  .hero-headline {
    font-size: 1.95rem;
  }

  .plan-price-num {
    font-size: 1.65rem;
  }
}

/* ==================================================
   无障碍与偏好减少动画设置
   ================================================== */
@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;
  }

  .hero-tab-item {
    transform: none !important;
  }
}