/* ==================================================
   寰宇云 - 2026 网络使用图鉴
   固定主配色与排版变量
   ================================================== */
:root {
  --bg-main: #F7F4ED;
  --bg-content: #FCFBF7;
  --bg-white: #FFFFFF;
  --text-primary: #1B2024;
  --text-body: #4D5350;
  --text-muted: #81847F;
  
  --color-steel-blue: #315D75;
  --color-quiet-cyan: #5D796F;
  --color-editorial-orange: #A86649;
  --color-warm-gold: #AF8A59;
  
  --color-light-blue: #EDF2F4;
  --color-light-green: #EFF2EE;
  --color-light-orange: #F7EDE7;
  
  --border-color: #DDD8CE;
  --border-light: #EBE6DC;
  
  --footer-bg: #ECE8DF;
  --footer-text: #444944;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", STSong, Georgia, serif;
  
  --container-max: 1160px;
  --article-max: 780px;
  
  --transition-normal: 0.2s ease-in-out;
}

/* ==================================================
   基础重置与全局样式
   ================================================== */
*, *::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-main);
  color: var(--text-body);
  line-height: 1.8;
  font-size: 1.0625rem; /* ~17px */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接与文字 */
a {
  color: var(--color-steel-blue);
  text-decoration: none;
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--color-editorial-orange);
}

p {
  margin-bottom: 1.25rem;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 3.25rem); /* 34px - 52px */
}

h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.125rem); /* 24px - 34px */
  margin-top: 1.5rem;
}

h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.5rem); /* 19px - 24px */
  margin-top: 1.25rem;
}

ul, ol {
  padding-left: 1.4rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

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

.article-container {
  width: 100%;
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ==================================================
   顶部导航栏 (Header)
   ================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-main);
  height: 72px;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo-svg {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

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

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.2;
  margin-top: 2px;
}

/* 导航链接 */
.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--text-body);
  position: relative;
  padding: 0.35rem 0;
  font-weight: 500;
  transition: color var(--transition-normal);
}

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

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-steel-blue);
}

/* 导航右侧 CTA */
.header-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  background-color: var(--color-steel-blue);
  color: #FFFFFF !important;
  border: 1px solid var(--color-steel-blue);
  transition: all var(--transition-normal);
}

.header-cta-btn:hover {
  background-color: #244658;
  transform: translateY(-1px);
}

.header-cta-btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-normal);
}

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

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.65rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  border-radius: 4px;
  cursor: pointer;
}

/* 移动端抽屉导航 */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  overflow-y: auto;
  z-index: 99;
}

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

.mobile-nav-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0;
}

.mobile-nav-link {
  display: block;
  padding: 0.85rem 0;
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
}

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

/* ==================================================
   按钮与组件样式 (Editorial Buttons)
   ================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: 4px;
  transition: all var(--transition-normal);
  cursor: pointer;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--color-steel-blue);
  color: #FFFFFF !important;
  border: 1px solid var(--color-steel-blue);
}

.btn-primary:hover {
  background-color: #244658;
  transform: translateY(-1px);
}

.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-secondary {
  background-color: var(--bg-content);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color);
}

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

.btn-text {
  background: transparent;
  color: var(--color-steel-blue) !important;
  border: none;
  padding: 0.5rem 0.25rem;
}

.btn-text:hover {
  color: var(--color-editorial-orange) !important;
}

.btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-normal);
}

/* 标签与 Badge */
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  line-height: 1;
}

.badge-blue {
  background-color: var(--color-light-blue);
  color: var(--color-steel-blue);
  border: 1px solid #C4D7E0;
}

.badge-green {
  background-color: var(--color-light-green);
  color: var(--color-quiet-cyan);
  border: 1px solid #CFDCD3;
}

.badge-orange {
  background-color: var(--color-light-orange);
  color: var(--color-editorial-orange);
  border: 1px solid #EBD5C8;
}

.badge-recommend {
  background-color: var(--color-steel-blue);
  color: #FFFFFF;
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.05em;
}

/* ==================================================
   Hero 区域 (网络图鉴封面)
   ================================================== */
.hero-handbook-cover {
  padding: 3.5rem 0 3rem 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
  position: relative;
}

.hero-editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.hero-meta-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.hero-vol-tag {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-steel-blue);
  background-color: var(--color-light-blue);
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border-color);
  border-radius: 2px;
}

.hero-edition-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-visual-lead {
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
  color: var(--color-quiet-cyan);
  font-family: var(--font-serif);
  margin-bottom: 0.85rem;
  line-height: 1.4;
}

.hero-main-title {
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-summary-box {
  max-width: 820px;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--color-steel-blue);
  padding: 1.35rem 1.65rem;
  margin-bottom: 2rem;
  font-size: 1.0625rem;
  color: var(--text-body);
}

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

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

/* ==================================================
   本册目录 (Handbook Table of Contents)
   ================================================== */
.handbook-toc-section {
  padding: 2.75rem 0 3.25rem 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-content);
}

.toc-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
}

.toc-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  margin: 0;
}

.toc-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.toc-index-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
}

.toc-index-item {
  display: flex;
  align-items: baseline;
  padding: 0.65rem 0.5rem;
  border-radius: 3px;
  transition: background-color var(--transition-normal);
  margin-bottom: 0;
}

.toc-index-item:hover {
  background-color: var(--color-light-blue);
}

.toc-item-num {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-steel-blue);
  min-width: 32px;
  font-variant-numeric: tabular-nums;
}

.toc-item-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.toc-dotted-line {
  flex-grow: 1;
  margin: 0 0.85rem;
  border-bottom: 1px dotted #B8B3A8;
  height: 1px;
  align-self: center;
}

.toc-item-action {
  font-size: 0.875rem;
  color: var(--color-steel-blue);
  white-space: nowrap;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==================================================
   章节模块通用结构 (Editorial Chapter Block)
   ================================================== */
.chapter-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.chapter-header {
  margin-bottom: 2rem;
}

.chapter-marker {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-editorial-orange);
  margin-bottom: 0.35rem;
  display: inline-block;
}

.chapter-heading {
  margin-bottom: 0.75rem;
}

.chapter-lead-text {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 820px;
}

/* 第一章编辑式双栏 */
.editorial-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.col-editorial-intro {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 2rem;
}

.col-editorial-index {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 2rem;
}

.section-index-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.section-index-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 0;
}

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

.section-index-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.section-index-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==================================================
   通用技术表格 (Technical Table)
   ================================================== */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  background-color: var(--bg-content);
  margin-bottom: 1.5rem;
}

.handbook-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

.handbook-table th {
  background-color: #F1ECE3;
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  white-space: nowrap;
}

.handbook-table th:last-child {
  border-right: none;
}

.handbook-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  vertical-align: top;
  color: var(--text-body);
}

.handbook-table td:last-child {
  border-right: none;
}

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

.handbook-table tbody tr:hover {
  background-color: #F8F6F0;
}

/* ==================================================
   第三章：节点图鉴索引 (Node Illustrated Index)
   ================================================== */
.node-index-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.node-index-row {
  display: grid;
  grid-template-columns: 90px 130px 1fr 1fr;
  align-items: center;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  transition: all var(--transition-normal);
}

.node-index-row:hover {
  border-color: var(--color-steel-blue);
  background-color: #FFFFFF;
}

.node-id-tag {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-editorial-orange);
}

.node-location-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.node-scenario-text {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.node-keypoint-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==================================================
   第四章/第五章：平台与AI索引条 (Platform Row Index)
   ================================================== */
.platform-index-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.platform-index-row {
  display: grid;
  grid-template-columns: 160px 1fr 1fr;
  align-items: center;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  transition: background-color var(--transition-normal);
}

.platform-index-row:hover {
  background-color: #FFFFFF;
  border-color: var(--color-quiet-cyan);
}

.platform-name-cell {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.platform-target-cell {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.platform-tip-cell {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==================================================
   第六章：设备技术清单 (Device Checklist)
   ================================================== */
.device-checklist {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.device-item-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  transition: border-color var(--transition-normal);
}

.device-item-card:hover {
  border-color: var(--color-steel-blue);
}

.device-info-col {
  display: flex;
  flex-direction: column;
}

.device-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.device-type-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.device-link-action {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-steel-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==================================================
   第七章：服务价目表 (Pricing Matrix)
   ================================================== */
.pricing-section {
  background-color: var(--bg-content);
}

.pricing-guidance-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1.25rem;
  background-color: #F1ECE3;
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  color: var(--text-body);
  align-items: center;
}

.guidance-title {
  font-weight: 700;
  color: var(--text-primary);
}

.guidance-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: #FFFFFF;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

.guidance-chip strong {
  color: var(--color-steel-blue);
}

/* Desktop 价目表 */
.pricing-table-container {
  display: block;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  border: 1px solid var(--border-color);
  background-color: #FFFFFF;
}

.pricing-table th {
  background-color: #EFEBE1;
  color: var(--text-primary);
  font-weight: 700;
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9375rem;
}

.pricing-table td {
  padding: 1.15rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
  font-size: 0.9375rem;
}

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

.pricing-plan-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.pricing-price-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-editorial-orange);
  font-variant-numeric: tabular-nums;
}

.pricing-traffic-text {
  font-weight: 600;
  color: var(--text-primary);
}

/* 进阶方案高亮行 */
.pricing-row-featured {
  background-color: var(--color-light-blue) !important;
  position: relative;
}

.pricing-row-featured td:first-child {
  border-left: 3px solid var(--color-steel-blue);
}

/* 移动端套餐卡片清单 (默认隐藏，移动端显示) */
.pricing-mobile-list {
  display: none;
  flex-direction: column;
  gap: 1rem;
}

.pricing-mobile-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 4px;
}

.pricing-mobile-card.is-featured {
  background-color: var(--color-light-blue);
  border-left: 3px solid var(--color-steel-blue);
}

.mobile-card-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
}

.mobile-plan-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.mobile-plan-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-editorial-orange);
}

.mobile-card-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.875rem;
  margin-bottom: 1rem;
  color: var(--text-body);
}

/* ==================================================
   第八章：品牌深度评测导读区
   ================================================== */
.review-highlight-box {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 2.25rem;
  border-left: 4px solid var(--color-steel-blue);
}

.review-highlight-inner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: center;
}

.review-brief-text {
  font-size: 1.0625rem;
  color: var(--text-body);
  line-height: 1.8;
}

.review-nav-points {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
  font-size: 0.9375rem;
}

.review-nav-points li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.review-nav-points li svg {
  color: var(--color-steel-blue);
  width: 14px;
  height: 14px;
}

/* ==================================================
   第九章：图鉴式文章目录 (Handbook Article Directory)
   ================================================== */
.handbook-article-directory {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.article-dir-row {
  display: grid;
  grid-template-columns: 48px 120px 1fr 140px;
  align-items: baseline;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1.15rem 1.25rem;
  transition: all var(--transition-normal);
}

.article-dir-row:hover {
  background-color: #FFFFFF;
  border-color: var(--color-steel-blue);
}

.dir-num {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-steel-blue);
  font-variant-numeric: tabular-nums;
}

.dir-cat {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
}

.dir-main-info {
  padding-right: 1.5rem;
}

.dir-title-link {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.35rem;
}

.dir-title-link:hover {
  color: var(--color-steel-blue);
}

.dir-excerpt-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

.dir-action-col {
  text-align: right;
  white-space: nowrap;
}

.dir-read-time {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.25rem;
}

.dir-action-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-steel-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==================================================
   第十章：排障顺序技术流程 (Troubleshooting Steps)
   ================================================== */
.troubleshoot-flow {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
}

.flow-step-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-light);
}

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

.flow-step-order {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--color-steel-blue);
  color: #FFFFFF;
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
}

.flow-step-content {
  flex-grow: 1;
}

.flow-step-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

/* ==================================================
   第十一章：图鉴问答 FAQ (Accordion)
   ================================================== */
.faq-handbook-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-handbook-item {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-handbook-item:hover {
  border-color: #B8B3A8;
}

.faq-handbook-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.15rem 1.35rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  line-height: 1.4;
}

.faq-q-prefix {
  color: var(--color-steel-blue);
  font-weight: 700;
  margin-right: 0.5rem;
}

.faq-arrow-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-left: 1rem;
  transition: transform var(--transition-normal);
  color: var(--text-muted);
}

.faq-handbook-item.is-active .faq-arrow-icon {
  transform: rotate(180deg);
}

.faq-handbook-answer {
  display: none;
  padding: 0 1.35rem 1.25rem 1.35rem;
  font-size: 0.9375rem;
  color: var(--text-body);
  line-height: 1.75;
  border-top: 1px dashed var(--border-light);
  margin-top: 0.25rem;
  padding-top: 1rem;
}

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

/* ==================================================
   文章详情页 (Editorial Article Detail)
   ================================================== */
.article-header {
  padding: 3rem 0 2rem 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumbs {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

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

.breadcrumbs a:hover {
  color: var(--color-steel-blue);
}

.breadcrumbs span {
  margin: 0 0.4rem;
}

.article-category-badge {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-steel-blue);
  background-color: var(--color-light-blue);
  padding: 0.25rem 0.65rem;
  border-radius: 2px;
  margin-bottom: 0.85rem;
}

.article-title {
  margin-bottom: 1.25rem;
  line-height: 1.3;
}

.article-abstract {
  font-size: 1.125rem;
  color: var(--text-body);
  line-height: 1.8;
  background-color: var(--bg-content);
  border-left: 3px solid var(--color-steel-blue);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding-top: 0.5rem;
}

/* 文章正文区域 */
.article-body-wrapper {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  margin: 2.5rem auto;
}

.article-body {
  font-size: 1.0625rem;
  color: var(--text-body);
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.625rem;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.article-geo-conclusion {
  background-color: #F1ECE3;
  border-left: 3px solid var(--color-editorial-orange);
  padding: 1.15rem 1.35rem;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.article-geo-conclusion strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.35rem;
}

.article-inpage-toc {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.article-inpage-toc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.article-inpage-toc ul {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.article-inpage-toc li {
  margin-bottom: 0.35rem;
}

.article-inpage-toc a {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.article-inpage-toc a:hover {
  color: var(--color-steel-blue);
}

/* 文章底部导航与相关阅读 */
.article-footer-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.nav-prev-box, .nav-next-box {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
}

.nav-dir-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.25rem;
}

.nav-target-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}

/* ==================================================
   分类页样式 (Category Template)
   ================================================== */
.category-header {
  padding: 3rem 0 2.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.category-intro-box {
  max-width: 820px;
  font-size: 1.0625rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-top: 1rem;
}

.category-content-area {
  padding: 3rem 0;
}

/* ==================================================
   标准单页 (About, Terms, Privacy, 404, Sitemap)
   ================================================== */
.legal-page-wrapper {
  padding: 3.5rem 0;
}

.legal-content-card {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  margin-top: 1.5rem;
}

.sitemap-group-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.sitemap-card {
  background-color: var(--bg-content);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
}

.sitemap-card h3 {
  font-size: 1.125rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  margin-top: 0;
}

/* ==================================================
   Footer (暖灰白编辑风)
   ================================================== */
.site-footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  border-top: 1px solid var(--border-color);
  padding-top: 2.5rem;
  padding-bottom: 1.75rem;
  font-size: 0.875rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr 1.2fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.footer-brand-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.footer-col-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
  letter-spacing: 0.04em;
}

.footer-link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-link-item {
  margin-bottom: 0.45rem;
}

.footer-link {
  color: var(--footer-text);
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--color-steel-blue);
}

/* Footer 底部分隔线与底部行严格固定 */
.footer-bottom-row {
  border-top: 1px solid #D8D2C5;
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--footer-text);
}

.footer-friends-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
}

.friends-label {
  color: var(--text-muted);
  font-weight: 600;
}

.friends-link {
  color: var(--footer-text);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.friends-link:hover {
  color: var(--color-steel-blue);
  text-decoration: underline;
}

/* ==================================================
   响应式断点适配 (375, 390, 430, 768, 1024, 1440)
   ================================================== */
@media (max-width: 1024px) {
  .header-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .footer-top-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
  
  .footer-cta-col {
    grid-column: span 4;
    padding-top: 1rem;
    border-top: 1px solid #D8D2C5;
  }
  
  .editorial-two-col {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 1rem;
    line-height: 1.75;
  }
  
  .site-header {
    height: 64px;
  }
  
  .mobile-drawer {
    top: 64px;
  }
  
  .hero-handbook-cover {
    padding: 2.25rem 0 2rem 0;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .toc-index-item {
    flex-wrap: wrap;
  }
  
  .toc-dotted-line {
    display: none;
  }
  
  .toc-item-action {
    margin-left: auto;
  }
  
  /* 节点索引移动端变为垂直卡片 */
  .node-index-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  
  /* 平台索引移动端 */
  .platform-index-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
  
  /* 设备技术清单移动端 */
  .device-checklist {
    grid-template-columns: 1fr;
  }
  
  /* 套餐表格在移动端隐藏，显示单列卡片 */
  .pricing-table-container {
    display: none;
  }
  
  .pricing-mobile-list {
    display: flex;
  }
  
  /* 文章目录在移动端 */
  .article-dir-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .dir-action-col {
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .dir-main-info {
    padding-right: 0;
  }
  
  .review-highlight-inner {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .footer-cta-col {
    grid-column: span 1;
  }
  
  .footer-bottom-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
  
  .sitemap-group-grid {
    grid-template-columns: 1fr;
  }
  
  .article-footer-nav {
    grid-template-columns: 1fr;
  }
}

/* 兼容 375px - 430px 超窄屏幕 */
@media (max-width: 430px) {
  .container, .article-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  
  .brand-name {
    font-size: 1.125rem;
  }
  
  .brand-tagline {
    font-size: 0.6875rem;
  }
  
  .hero-summary-box {
    padding: 1rem;
  }
  
  .pricing-mobile-card {
    padding: 1rem;
  }
  
  .friends-link {
    display: block;
    width: 100%;
  }
}

/* ==================================================
   无障碍与动效偏好 (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;
  }
}