/* ==================================================
   锦云机场 第3套独立官方网站 - 切页索引系统
   ================================================== */

:root {
  --bg-primary: #FBFAF6;
  --bg-white: #FFFFFF;
  --bg-secondary: #F2F0EA;
  --text-main: #1E2426;
  --text-body: #5B6365;
  --text-muted: #888E90;
  --color-slate: #405760;
  --color-slate-dark: #30444C;
  --color-sage: #627067;
  --color-sage-dark: #4C5952;
  --color-warm-brown: #A47B57;
  --color-terracotta: #B06E4D;
  --color-light-blue-gray: #EEF1F2;
  --color-light-sage-gray: #EFF2EF;
  --color-light-warm: #F5EEE7;
  --border-color: #E1DED7;
  --border-light: #ECE9E2;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --container-max: 1180px;
  --header-height: 70px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

*, *::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-primary);
  color: var(--text-body);
  line-height: 1.85;
  font-weight: 400;
  font-size: 1rem;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* 链接基础样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
  color: var(--color-warm-brown);
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.35;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.45rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-body);
}

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

/* 按钮通用 */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.cta-button-primary {
  background-color: var(--color-slate-dark);
  color: var(--bg-white);
  border-color: var(--color-slate-dark);
}

.cta-button-primary:hover {
  background-color: var(--color-slate);
  color: var(--bg-white);
  transform: translateY(-1px);
}

.cta-button-accent {
  background-color: var(--color-warm-brown);
  color: var(--bg-white);
  border-color: var(--color-warm-brown);
}

.cta-button-accent:hover {
  background-color: var(--color-terracotta);
  color: var(--bg-white);
  transform: translateY(-1px);
}

.cta-button-outline {
  background-color: transparent;
  color: var(--color-slate-dark);
  border-color: var(--border-color);
}

.cta-button-outline:hover {
  background-color: var(--bg-white);
  border-color: var(--color-slate);
  color: var(--color-slate-dark);
}

/* 容器布局 */
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  width: 100%;
}

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

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

.brand-block {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

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

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-slogan {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding: 8px 2px;
}

.nav-link:hover {
  color: var(--color-slate-dark);
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background-color: var(--color-warm-brown);
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
  font-family: inherit;
}

/* 移动端菜单抽屉 */
.mobile-nav-panel {
  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-color);
  z-index: 99;
  padding: 24px;
  overflow-y: auto;
}

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

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.mobile-nav-links a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
}

/* ==================================================
   Hero - 封面式结构 + 右侧5个章节页签
   ================================================== */
.hero-wrapper {
  padding-top: 36px;
  padding-bottom: 48px;
}

.hero-cover {
  position: relative;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 56px 64px 48px 56px;
  min-height: 580px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-slate);
  background-color: var(--color-light-sage-gray);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
  width: fit-content;
}

.hero-main-title {
  font-size: clamp(2.4rem, 4.2vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-main);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-slate);
  margin-bottom: 18px;
}

.hero-lead-quote {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-warm-brown);
  border-left: 3px solid var(--color-warm-brown);
  padding-left: 14px;
  margin-bottom: 24px;
  line-height: 1.4;
}

.hero-h1-seo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 760px;
  line-height: 1.85;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

/* Hero 右侧伸出的5个独立章节页签 (Desktop) */
.hero-edge-tabs {
  position: absolute;
  right: -32px;
  top: 60px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 10;
}

.hero-edge-tab-item {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  width: 110px;
  height: 48px;
  padding: 0 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-left: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: transform 0.2s ease, background-color 0.2s ease;
  box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.03);
}

.hero-edge-tab-item:hover {
  transform: translateX(4px);
  color: var(--color-slate-dark);
}

.hero-edge-tab-item .tab-num {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-edge-tab-item.tab-package {
  background-color: var(--color-light-warm);
}

.hero-edge-tab-item.tab-node {
  background-color: var(--color-light-blue-gray);
}

.hero-edge-tab-item.tab-line {
  background-color: var(--color-light-sage-gray);
}

.hero-edge-tab-item.tab-ai {
  background-color: var(--bg-white);
}

.hero-edge-tab-item.tab-client {
  background-color: var(--bg-secondary);
}

/* 移动端章节目录条（在Hero底部展示） */
.hero-mobile-directory {
  display: none;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.hero-mobile-dir-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.hero-mobile-dir-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-mobile-dir-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
}

/* ==================================================
   Section 基础规范 (01–10 章节)
   ================================================== */
.section-wrapper {
  padding-top: 64px;
  padding-bottom: 64px;
  border-top: 1px solid var(--border-light);
}

.section-wrapper:first-of-type {
  border-top: none;
}

.section-container {
  position: relative;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 44px 48px;
}

/* Section Header 章节标头 + 页边短签 */
.section-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.section-chapter-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.chapter-number-badge {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-warm-brown);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.chapter-number-badge::after {
  content: "";
  display: inline-block;
  width: 24px;
  height: 1px;
  background-color: var(--border-color);
}

/* Section 页边短签（属于当前Section，不固定悬浮） */
.section-edge-short-tab {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-slate-dark);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.section-lead-direct-answer {
  background-color: var(--bg-primary);
  border-left: 3px solid var(--color-slate);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 28px;
  font-size: 1.02rem;
  color: var(--text-main);
  line-height: 1.8;
}

/* ==================================================
   01 / 套餐索引页 (Package Index)
   ================================================== */
.package-index-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 28px;
  align-items: stretch;
}

.package-main-display {
  background-color: var(--color-light-sage-gray);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.package-badge-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-terracotta);
  background-color: var(--color-light-warm);
  border: 1px solid var(--border-color);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  width: fit-content;
}

.package-name {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-slate-dark);
  margin-bottom: 6px;
}

.package-traffic-highlight {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-slate);
  margin-bottom: 16px;
}

.package-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
}

.package-price-num {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-main);
}

.package-price-cycle {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.package-scenarios-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.package-scenarios-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-body);
}

.package-scenarios-list li::before {
  content: "—";
  color: var(--color-warm-brown);
  font-weight: 700;
}

/* 套餐右侧索引签列表 */
.package-index-sidebar {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.package-index-item-tab {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: 100%;
}

.package-index-item-tab:hover,
.package-index-item-tab.active {
  background-color: var(--bg-white);
  border-color: var(--color-slate);
  transform: translateX(3px);
}

.package-index-item-tab.active {
  border-left: 4px solid var(--color-warm-brown);
}

.pkg-tab-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.pkg-tab-num {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pkg-tab-price {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.pkg-tab-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.pkg-tab-traffic {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==================================================
   02 / 节点索引页 (Node Index)
   ================================================== */
.node-index-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
}

.node-index-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.node-nav-tab {
  padding: 12px 16px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-nav-tab:hover,
.node-nav-tab.active {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--color-slate);
  border-left: 4px solid var(--color-slate);
}

.node-main-content-pane {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px;
}

.node-detail-card {
  display: none;
}

.node-detail-card.active {
  display: block;
}

.node-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.node-grid-scenarios {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 20px;
  margin-bottom: 24px;
}

.node-scenario-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.node-scenario-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-slate-dark);
  margin-bottom: 6px;
}

.node-scenario-text {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==================================================
   03 / 线路索引 (Line Index)
   ================================================== */
.line-table-wrapper {
  overflow-x: auto;
  margin-bottom: 36px;
}

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

.line-specs-table th {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-weight: 600;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.line-specs-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-body);
  line-height: 1.7;
}

.line-specs-table tr:hover td {
  background-color: var(--bg-primary);
}

.line-knowledge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.line-knowledge-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.line-knowledge-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

/* ==================================================
   04 / AI与流媒体 (AI & Streaming)
   ================================================== */
.ai-media-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
}

.ai-section-box,
.streaming-section-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px;
}

.section-subhead-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-slate);
  background-color: var(--color-light-blue-gray);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.platform-index-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 16px;
}

.platform-index-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.platform-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

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

.platform-rec-node {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-sage-dark);
  background-color: var(--color-light-sage-gray);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.platform-notes {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==================================================
   05 / 客户端 (Client Index)
   ================================================== */
.client-index-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}

.client-tabs-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.client-tab-btn {
  padding: 12px 16px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.client-tab-btn:hover,
.client-tab-btn.active {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--color-slate);
  border-left: 4px solid var(--color-slate-dark);
}

.client-detail-pane {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px;
}

.client-device-card {
  display: none;
}

.client-device-card.active {
  display: block;
}

.client-steps-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
  margin-bottom: 24px;
}

.client-step-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
}

.client-step-num {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-warm-brown);
  padding-top: 2px;
}

.client-step-body strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 2px;
}

.client-subops-nav {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.client-subop-tag {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-slate);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

/* ==================================================
   06 / 完整价格 (Full Price Index)
   ================================================== */
.full-pricing-table-container {
  overflow-x: auto;
  margin-bottom: 28px;
}

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

.full-pricing-table th {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-weight: 600;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.full-pricing-table td {
  padding: 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-body);
}

.full-pricing-table tr.highlight-row {
  background-color: var(--color-light-sage-gray);
  font-weight: 500;
}

.full-pricing-table tr.highlight-row td {
  color: var(--text-main);
}

.pricing-clarification-note {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding: 14px 18px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
}

/* ==================================================
   07 / 锦云机场深度评测 (Review Section)
   ================================================== */
.review-highlight-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.review-quick-verdict {
  background-color: var(--color-light-warm);
  border-left: 3px solid var(--color-warm-brown);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.8;
}

.review-points-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 10px;
}

.review-point-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.review-point-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-slate-dark);
  margin-bottom: 6px;
}

/* ==================================================
   08 / 内容索引中心 (Content Index)
   ================================================== */
.content-hub-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
}

.content-cat-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.content-cat-btn {
  padding: 12px 16px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.content-cat-btn:hover,
.content-cat-btn.active {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--color-slate);
  border-left: 4px solid var(--color-warm-brown);
}

.content-articles-pane {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px 32px;
}

.article-group-pane {
  display: none;
}

.article-group-pane.active {
  display: block;
}

.article-list-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-card-row {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-card-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.article-cat-tag {
  color: var(--color-slate);
  font-weight: 600;
}

.article-title-link {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
}

.article-title-link:hover {
  color: var(--color-warm-brown);
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* ==================================================
   09 / 网络排障 (Troubleshooting Index)
   ================================================== */
.troubleshoot-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
}

.troubleshoot-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.troubleshoot-btn {
  padding: 12px 16px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.troubleshoot-btn:hover,
.troubleshoot-btn.active {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--color-slate);
  border-left: 4px solid var(--color-terracotta);
}

.troubleshoot-detail-pane {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px;
}

.troubleshoot-item-card {
  display: none;
}

.troubleshoot-item-card.active {
  display: block;
}

.ts-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.ts-info-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.ts-info-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-slate);
  margin-bottom: 6px;
}

.ts-info-text {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==================================================
   10 / FAQ 常见问题 (FAQ Section)
   ================================================== */
.faq-section-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
}

.faq-cat-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-cat-btn {
  padding: 10px 14px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.faq-cat-btn:hover,
.faq-cat-btn.active {
  background-color: var(--bg-white);
  color: var(--text-main);
  border-color: var(--color-slate);
  border-left: 3px solid var(--color-warm-brown);
}

.faq-accordion-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-accordion-group {
  display: none;
}

.faq-accordion-group.active {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: background-color 0.2s ease;
}

.faq-question:hover {
  background-color: var(--bg-primary);
}

.faq-q-num {
  font-size: 0.8rem;
  color: var(--color-warm-brown);
  font-weight: 700;
  margin-right: 10px;
}

.faq-toggle-icon {
  font-size: 1.2rem;
  color: var(--text-muted);
  font-weight: 400;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  display: none;
  padding: 0 20px 20px 20px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.8;
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-primary);
}

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

/* ==================================================
   Footer (浅色紧凑目录风格，高度约260-320px)
   ================================================== */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px 0;
  color: #4B5456;
  font-size: 0.9rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}

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

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

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.7;
}

.footer-col-header {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-col-num {
  font-size: 0.75rem;
  color: var(--color-warm-brown);
  font-weight: 700;
}

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

.footer-nav-list a {
  color: #4B5456;
  font-size: 0.88rem;
}

.footer-nav-list a:hover {
  color: var(--color-slate-dark);
}

.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: 0.82rem;
  color: var(--text-muted);
}

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

.footer-friend-links a {
  color: var(--color-slate);
}

.footer-friend-links a:hover {
  color: var(--color-warm-brown);
}

/* ==================================================
   文章内页布局 (Article Layout)
   ================================================== */
.article-page-main {
  padding-top: 36px;
  padding-bottom: 64px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumb-nav a:hover {
  color: var(--color-warm-brown);
}

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

.article-content-layout {
  display: grid;
  grid-template-columns: minmax(0, 800px) 240px;
  gap: 40px;
  align-items: start;
}

.article-entry-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 48px;
}

.article-header-meta {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.article-chapter-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-slate-dark);
  background-color: var(--color-light-sage-gray);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.article-main-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 16px;
}

.article-meta-info-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.fast-verdict-box {
  background-color: var(--color-light-warm);
  border-left: 4px solid var(--color-warm-brown);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin-bottom: 36px;
}

.fast-verdict-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-terracotta);
  margin-bottom: 8px;
}

.fast-verdict-text {
  font-size: 0.98rem;
  color: var(--text-main);
  line-height: 1.8;
  margin-bottom: 0;
}

.article-body-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.article-body-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-slate-dark);
  margin-top: 24px;
  margin-bottom: 12px;
}

.article-body-content p {
  font-size: 1.02rem;
  color: var(--text-body);
  line-height: 1.88;
  margin-bottom: 20px;
}

.article-body-content ul,
.article-body-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
}

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

.article-related-links-card {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border-light);
}

.related-links-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

.related-links-list a {
  color: var(--color-slate-dark);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-links-list a::before {
  content: "→";
  color: var(--color-warm-brown);
}

.related-links-list a:hover {
  color: var(--color-warm-brown);
}

/* 文章右侧轻量目录 (Desktop) */
.article-toc-aside {
  position: sticky;
  top: 90px;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  max-width: 240px;
}

.toc-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.toc-list a {
  color: var(--text-body);
  line-height: 1.45;
  display: block;
}

.toc-list a:hover {
  color: var(--color-warm-brown);
}

/* 分类页独立样式 */
.category-cover-hero {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 48px;
  margin-bottom: 40px;
}

.category-lead-intro {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 760px;
  line-height: 1.85;
}

/* ==================================================
   JS 关闭优雅降级 (No-JS Fallback)
   ================================================== */
/* 当没有 JS 时，展示所有卡片与内容，不隐藏任何部分 */
html:not(.js-ready) .node-detail-card,
html:not(.js-ready) .client-device-card,
html:not(.js-ready) .article-group-pane,
html:not(.js-ready) .troubleshoot-item-card,
html:not(.js-ready) .faq-accordion-group {
  display: block !important;
  margin-bottom: 24px;
}

html:not(.js-ready) .faq-answer {
  display: block !important;
  padding-top: 12px;
}

html:not(.js-ready) .faq-toggle-icon {
  display: none;
}

/* ==================================================
   响应式断点适配 (Responsive Breakpoints)
   ================================================== */
@media (max-width: 1080px) {
  .hero-edge-tabs {
    display: none; /* 边缘超出标签在较窄屏隐藏，改用底部目录 */
  }

  .hero-mobile-directory {
    display: block;
  }

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .article-toc-aside {
    display: none;
  }
}

@media (max-width: 900px) {
  .header-nav,
  .header-actions .cta-button {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .package-index-layout,
  .node-index-layout,
  .ai-media-container,
  .client-index-layout,
  .content-hub-layout,
  .troubleshoot-layout,
  .faq-section-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .package-index-sidebar,
  .node-index-nav,
  .client-tabs-nav,
  .content-cat-nav,
  .troubleshoot-nav,
  .faq-cat-nav {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .package-index-item-tab,
  .node-nav-tab,
  .client-tab-btn,
  .content-cat-btn,
  .troubleshoot-btn,
  .faq-cat-btn {
    width: auto;
    flex: 1 1 auto;
    font-size: 0.88rem;
    padding: 8px 12px;
  }

  .hero-cover {
    padding: 36px 28px;
  }

  .section-container {
    padding: 28px 20px;
  }

  .article-entry-box {
    padding: 28px 20px;
  }
}

@media (max-width: 600px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-cover {
    padding: 28px 18px;
  }

  .hero-main-title {
    font-size: 2rem;
  }

  .hero-lead-quote {
    font-size: 1.15rem;
  }

  .section-container {
    padding: 24px 16px;
  }

  .section-header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

/* ==================================================
   减弱动态动效支持 (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;
  }
}