/* ==================================================
   闪连VPN - 官方主样式表 (style.css)
   主题：“一键连接系统”
   设计哲学：现代商务、轻技术感、高留白、纯白+浅灰蓝+深石墨+湖蓝+青绿+暖橙
   ================================================== */

:root {
  /* 主配色 */
  --bg-main: #F7F9FA;
  --bg-white: #FFFFFF;
  --bg-sub: #F0F4F5;
  --bg-light-blue: #ECF3F5;
  --bg-light-green: #EDF4F1;
  --bg-footer: #EDF2F3;

  /* 文字颜色 */
  --text-main: #182329;
  --text-body: #58666D;
  --text-muted: #88949A;
  --text-footer: #46555C;

  /* 主题与点缀色 */
  --color-lake-blue: #326B7B;
  --color-lake-dark: #285462;
  --color-cyan-green: #3D7E70;
  --color-warm-orange: #C57849;

  /* 边框与分隔线 */
  --border-color: #DEE6E8;
  --border-focus: #326B7B;

  /* 阴影与过渡 */
  --shadow-subtle: 0 2px 8px rgba(24, 35, 41, 0.04);
  --shadow-card: 0 4px 16px rgba(24, 35, 41, 0.06);
  --transition-fast: all 0.2s ease;

  /* 字体系统 */
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

/* 基础重置 */
*, *::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-stack);
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.8;
  font-size: 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-lake-dark);
}

img, svg {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

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

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 排版规范 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.35;
}

h1 {
  font-size: clamp(32px, 4.5vw, 48px);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(24px, 3.2vw, 32px);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(20px, 2.4vw, 24px);
}

p {
  margin-bottom: 1.25rem;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  transition: var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-lake-dark);
  color: #FFFFFF;
  border-color: var(--color-lake-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--color-lake-blue);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-light-blue);
  color: var(--color-lake-dark);
  border-color: var(--color-lake-blue);
}

.btn-orange {
  background-color: var(--color-warm-orange);
  color: #FFFFFF;
  border: 1px solid var(--color-warm-orange);
}

.btn-orange:hover {
  background-color: #A96238;
  color: #FFFFFF;
  border-color: #A96238;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.88rem;
}

.arrow-icon {
  display: inline-block;
  transition: transform 0.2s ease;
}

.btn:hover .arrow-icon,
a:hover .arrow-icon {
  transform: translateX(3px);
}

/* 徽章与标签 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 4px;
  line-height: 1.4;
}

.badge-blue {
  background-color: var(--bg-light-blue);
  color: var(--color-lake-blue);
  border: 1px solid rgba(50, 107, 123, 0.15);
}

.badge-green {
  background-color: var(--bg-light-green);
  color: var(--color-cyan-green);
  border: 1px solid rgba(61, 126, 112, 0.15);
}

.badge-orange {
  background-color: #FAF0E6;
  color: var(--color-warm-orange);
  border: 1px solid rgba(197, 120, 73, 0.25);
}

/* ==================================================
   Header 导航栏 (66px–72px)
   ================================================== */
.site-header {
  height: 70px;
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.header-brand:hover {
  opacity: 0.9;
}

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

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

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

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

.nav-link {
  font-size: 0.92rem;
  color: var(--text-body);
  font-weight: 500;
  position: relative;
  padding: 8px 2px;
  transition: color 0.2s ease;
}

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

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

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

.header-cta {
  display: flex;
  align-items: center;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: var(--bg-white);
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition-fast);
}

.mobile-nav-drawer {
  display: none;
}

/* ==================================================
   Hero 连接控制区 (Desktop: 620px–720px)
   ================================================== */
.hero-section {
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0 56px;
  position: relative;
}

.hero-content {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.hero-meta-badge {
  margin-bottom: 16px;
}

.hero-title {
  margin-bottom: 16px;
  color: var(--text-main);
}

.hero-slogan {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--color-lake-blue);
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-desc {
  font-size: 1.02rem;
  color: var(--text-body);
  line-height: 1.85;
  max-width: 800px;
  margin: 0 auto 32px;
}

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

/* 连接准备流程 (Desktop: 01 ─ 02 ─ 03 ─ 04 ─ 05) */
.hero-prep-block {
  margin-top: 16px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.prep-heading {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 24px;
}

.prep-steps-horizontal {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  position: relative;
  gap: 12px;
}

.prep-step-item {
  flex: 1;
  position: relative;
  text-align: center;
  padding: 0 8px;
}

.prep-step-num {
  width: 38px;
  height: 38px;
  margin: 0 auto 12px;
  background-color: var(--bg-light-blue);
  color: var(--color-lake-blue);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 700;
  position: relative;
  z-index: 2;
  transition: var(--transition-fast);
}

.prep-step-item:hover .prep-step-num {
  background-color: var(--color-lake-blue);
  color: #FFFFFF;
  border-color: var(--color-lake-blue);
}

.prep-step-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.prep-step-desc {
  font-size: 0.84rem;
  color: var(--text-body);
  line-height: 1.5;
}

.prep-line {
  position: absolute;
  top: 19px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: repeating-linear-gradient(to right, var(--border-color) 0, var(--border-color) 6px, transparent 6px, transparent 10px);
  z-index: 1;
}

/* ==================================================
   通用模块规范
   ================================================== */
.page-section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border-color);
}

.page-section:nth-child(even) {
  background-color: var(--bg-white);
}

.page-section:nth-child(odd) {
  background-color: var(--bg-main);
}

.section-header {
  margin-bottom: 40px;
}

.section-tag {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-cyan-green);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.section-title {
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-intro {
  font-size: 1.02rem;
  color: var(--text-body);
  max-width: 780px;
}

/* ==================================================
   01 / 设备选择 (4列清单)
   ================================================== */
.device-table-wrapper {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow-x: auto;
  box-shadow: var(--shadow-subtle);
}

.device-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.device-table th {
  background-color: var(--bg-sub);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.device-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.94rem;
  vertical-align: middle;
}

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

.device-table tr:hover td {
  background-color: var(--bg-main);
}

.device-name {
  font-weight: 700;
  color: var(--text-main);
  font-size: 1.05rem;
}

/* ==================================================
   02 / 使用场景 (场景切换条 + 详情展示)
   ================================================== */
.scenario-nav-bar {
  display: flex;
  gap: 12px;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 28px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.scenario-tab-btn {
  padding: 10px 18px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-body);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -6px;
  white-space: nowrap;
  transition: var(--transition-fast);
}

.scenario-tab-btn:hover {
  color: var(--color-lake-blue);
}

.scenario-tab-btn.active {
  color: var(--color-lake-blue);
  border-bottom-color: var(--color-lake-blue);
}

.scenario-panel {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 32px;
  box-shadow: var(--shadow-subtle);
}

.scenario-panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.scenario-info-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.scenario-factor-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scenario-factor-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.94rem;
}

.factor-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-cyan-green);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

/* ==================================================
   03 / 节点地区 (清单结构)
   ================================================== */
.node-list-table {
  width: 100%;
  border-collapse: collapse;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

.node-list-table th {
  background-color: var(--bg-sub);
  color: var(--text-main);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.node-list-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.94rem;
  vertical-align: middle;
}

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

.node-list-table tr:hover td {
  background-color: var(--bg-main);
}

.node-region-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
}

/* ==================================================
   04 / AI工具 & 05 / 流媒体 (连续信息行)
   ================================================== */
.info-row-container {
  display: flex;
  flex-direction: column;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

.info-row {
  display: grid;
  grid-template-columns: 200px 1.4fr 1.6fr;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  gap: 20px;
  transition: var(--transition-fast);
}

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

.info-row:hover {
  background-color: var(--bg-sub);
}

.info-row-header {
  font-weight: 700;
  color: var(--text-main);
  font-size: 1.05rem;
}

.info-row-factors {
  color: var(--color-lake-blue);
  font-size: 0.92rem;
  font-weight: 500;
}

.info-row-desc {
  font-size: 0.93rem;
  color: var(--text-body);
}

/* 流媒体4列行 */
.stream-row {
  display: grid;
  grid-template-columns: 180px 1fr 1fr 1.2fr;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  gap: 20px;
  transition: var(--transition-fast);
}

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

.stream-row:hover {
  background-color: var(--bg-sub);
}

/* ==================================================
   06 / 客户端教程 (配置指引)
   ================================================== */
.client-guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.client-guide-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 28px;
  box-shadow: var(--shadow-subtle);
}

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

.client-card-title {
  font-size: 1.2rem;
  color: var(--text-main);
  font-weight: 700;
}

.client-card-body {
  font-size: 0.94rem;
  color: var(--text-body);
  margin-bottom: 20px;
  line-height: 1.75;
}

.client-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 22px;
}

.client-checklist li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-body);
}

.client-check-icon {
  width: 14px;
  height: 14px;
  color: var(--color-cyan-green);
  flex-shrink: 0;
}

/* ==================================================
   07 / 套餐价格 (连接方案表 - 唯一主推高亮)
   ================================================== */
.pricing-section {
  background-color: #FFFFFF;
}

.pricing-table-container {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow-x: auto;
  box-shadow: var(--shadow-subtle);
  margin-bottom: 32px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.pricing-table th {
  background-color: var(--bg-sub);
  color: var(--text-main);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table td {
  padding: 22px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.96rem;
  vertical-align: middle;
}

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

/* 闪连方案 - 唯一主推 */
.pricing-row-featured {
  background-color: var(--bg-light-blue) !important;
  position: relative;
}

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

.pricing-row-featured .plan-name {
  color: var(--color-lake-dark);
}

.plan-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

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

.plan-traffic {
  font-weight: 600;
  color: var(--color-lake-blue);
}

/* 套餐快速选择指引 */
.pricing-quick-picker {
  background: var(--bg-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
}

.quick-picker-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.quick-picker-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.quick-picker-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 14px;
  text-align: center;
}

.quick-need {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.quick-match {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-lake-blue);
}

/* 移动端套餐卡片容器 (默认隐藏，移动端切换) */
.mobile-pricing-list {
  display: none;
}

/* ==================================================
   08 / 闪连VPN深度评测区块
   ================================================== */
.review-highlight-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-lake-blue);
  border-radius: 8px;
  padding: 36px;
  box-shadow: var(--shadow-subtle);
}

.review-card-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 36px;
  align-items: center;
}

.review-card-text h3 {
  font-size: 1.45rem;
  margin-bottom: 16px;
}

.review-card-text p {
  color: var(--text-body);
  margin-bottom: 20px;
  line-height: 1.8;
}

.review-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.review-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.94rem;
  color: var(--text-body);
}

.review-stat-box {
  background: var(--bg-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
}

.review-stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.review-stat-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-lake-blue);
  margin-bottom: 16px;
}

/* ==================================================
   09 / 连接知识文章列表 (细分隔线结构，非卡片墙)
   ================================================== */
.knowledge-list-container {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
}

.knowledge-item {
  display: grid;
  grid-template-columns: 80px 1fr 180px;
  padding: 24px 28px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  gap: 24px;
  transition: var(--transition-fast);
}

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

.knowledge-item:hover {
  background-color: var(--bg-main);
}

.knowledge-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-muted);
  font-family: monospace;
}

.knowledge-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.knowledge-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
}

.knowledge-category {
  color: var(--color-cyan-green);
  font-weight: 600;
}

.knowledge-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-main);
  transition: var(--transition-fast);
}

.knowledge-title:hover {
  color: var(--color-lake-blue);
}

.knowledge-summary {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.6;
}

.knowledge-action {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.knowledge-read-time {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==================================================
   10 / 网络排障 (01-08 连接检查流程)
   ================================================== */
.troubleshoot-flow {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.troubleshoot-step {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 100px 220px 1fr;
  align-items: center;
  gap: 24px;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-fast);
}

.troubleshoot-step:hover {
  border-color: var(--color-lake-blue);
}

.troubleshoot-badge {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-lake-blue);
  background: var(--bg-light-blue);
  padding: 6px 12px;
  border-radius: 4px;
  text-align: center;
}

.troubleshoot-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.troubleshoot-detail {
  font-size: 0.92rem;
  color: var(--text-body);
}

/* ==================================================
   11 / 常见问题 (连接问答 Accordion)
   ================================================== */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 960px;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-lake-blue);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: transparent;
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 600;
}

.faq-q-index {
  color: var(--color-lake-blue);
  font-weight: 700;
  margin-right: 12px;
  font-size: 0.95rem;
}

.faq-toggle-icon {
  font-size: 1.3rem;
  color: var(--text-muted);
  line-height: 1;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  display: none;
  padding: 0 24px 22px 24px;
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.8;
  border-top: 1px dashed var(--border-color);
  margin-top: 4px;
  padding-top: 16px;
}

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

/* ==================================================
   文章内页排版 (760px–820px, 纯白+湖蓝技术风)
   ================================================== */
.article-page-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border-color);
  background: #FFFFFF;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

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

.article-title {
  font-size: clamp(28px, 3.6vw, 42px);
  margin-bottom: 18px;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-bottom: 12px;
}

.article-summary-lead {
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--text-body);
  background: var(--bg-sub);
  border-left: 3px solid var(--color-lake-blue);
  padding: 18px 24px;
  border-radius: 0 6px 6px 0;
  margin-top: 20px;
}

.article-layout {
  padding: 48px 0 80px;
}

.article-content {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 44px 48px;
  box-shadow: var(--shadow-subtle);
  font-size: 1.05rem;
  line-height: 1.85;
}

/* GEO: 快速结论 */
.geo-conclusion {
  background: var(--bg-light-green);
  border: 1px solid rgba(61, 126, 112, 0.25);
  border-radius: 6px;
  padding: 20px 24px;
  margin-bottom: 36px;
}

.geo-conclusion-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-cyan-green);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.geo-conclusion p {
  font-size: 0.98rem;
  color: var(--text-main);
  margin: 0;
}

/* 本文目录 */
.article-toc {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 22px 28px;
  margin-bottom: 40px;
}

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

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
}

.toc-list a {
  color: var(--text-body);
}

.toc-list a:hover {
  color: var(--color-lake-blue);
  text-decoration: underline;
}

.article-content h2 {
  font-size: 1.6rem;
  margin-top: 44px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 30px;
  margin-bottom: 12px;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 3px solid var(--border-color);
  padding: 12px 20px;
  color: var(--text-muted);
  background: var(--bg-sub);
  margin-bottom: 1.5rem;
  font-style: normal;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
  font-size: 0.94rem;
}

.article-content table th {
  background-color: var(--bg-sub);
  color: var(--text-main);
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-content table td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
}

/* 文章底部导航与相关阅读 */
.article-footer-nav {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.article-related-box {
  margin-top: 48px;
  background: var(--bg-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 28px;
}

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

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-list a {
  color: var(--text-main);
  font-size: 0.96rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.related-list a:hover {
  color: var(--color-lake-blue);
}

/* ==================================================
   分类页样式 (category)
   ================================================== */
.category-hero {
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0 36px;
}

.category-title {
  margin-bottom: 12px;
}

.category-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 820px;
  line-height: 1.8;
}

/* ==================================================
   Footer 页脚 (浅灰蓝 #EDF2F3, 250px–320px)
   ================================================== */
.site-footer {
  background-color: var(--bg-footer);
  border-top: 1px solid var(--border-color);
  color: var(--text-footer);
  padding: 48px 0 28px;
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(70, 85, 92, 0.15);
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-footer);
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

.footer-links a {
  color: var(--text-footer);
  font-size: 0.88rem;
  transition: var(--transition-fast);
}

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

/* Footer底部固定栏 (左: 版权, 右: 友情链接) */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  font-size: 0.84rem;
  color: var(--text-footer);
  flex-wrap: wrap;
  gap: 16px;
}

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

.friend-links-title {
  font-weight: 600;
  color: var(--text-main);
}

.footer-links-group a {
  color: var(--text-footer);
  transition: var(--transition-fast);
}

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

/* ==================================================
   无动效偏好 (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;
  }
  .arrow-icon,
  .btn:hover .arrow-icon,
  a:hover .arrow-icon {
    transform: none !important;
  }
}

/* ==================================================
   响应式断点适配 (1024, 768, 430, 390, 375)
   ================================================== */
@media (max-width: 1024px) {
  .header-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .info-row {
    grid-template-columns: 140px 1fr 1fr;
  }
  .stream-row {
    grid-template-columns: 140px 1fr 1fr 1fr;
  }
  .quick-picker-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .page-section {
    padding: 48px 0;
  }

  .hero-section {
    padding: 36px 0 44px;
  }

  /* 移动端连接准备流程转为纵向 */
  .prep-steps-horizontal {
    flex-direction: column;
    gap: 16px;
  }

  .prep-line {
    display: none;
  }

  .prep-step-item {
    display: flex;
    align-items: flex-start;
    text-align: left;
    gap: 16px;
    width: 100%;
    padding: 0;
  }

  .prep-step-num {
    margin: 0;
    flex-shrink: 0;
  }

  /* 设备区转为移动端卡片式/清单式 */
  .device-table-wrapper {
    display: none;
  }

  .mobile-device-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .mobile-device-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
  }

  .mobile-device-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
  }

  .mobile-device-card-desc {
    font-size: 0.9rem;
    color: var(--text-body);
    margin-bottom: 12px;
  }

  /* 客户端指引 */
  .client-guides-grid {
    grid-template-columns: 1fr;
  }

  /* 套餐价格移动端 */
  .pricing-table-container {
    display: none;
  }

  .mobile-pricing-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
  }

  .mobile-plan-item {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .mobile-plan-item.featured {
    background-color: var(--bg-light-blue);
    border-left: 4px solid var(--color-lake-blue);
  }

  .mobile-plan-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .mobile-plan-price-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
  }

  .quick-picker-grid {
    grid-template-columns: 1fr;
  }

  /* 知识列表移动端 */
  .knowledge-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }

  .knowledge-num {
    display: none;
  }

  .knowledge-action {
    align-items: flex-start;
  }

  /* 排障流程移动端 */
  .troubleshoot-step {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 16px;
  }

  /* 文章页移动端 */
  .article-content {
    padding: 24px 20px;
  }

  .review-card-grid {
    grid-template-columns: 1fr;
  }

  .scenario-panel-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .info-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .stream-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* 页脚移动端 */
  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}

/* 抽屉导航 (移动端展开) */
.mobile-nav-drawer {
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #FFFFFF;
  z-index: 999;
  padding: 24px;
  overflow-y: auto;
  border-top: 1px solid var(--border-color);
  display: none;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.1rem;
  color: var(--text-main);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  font-weight: 500;
}

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