/**
 * 新华云 XinHuaCloud - 01 深蓝科技门户主题样式表
 * 严格按照色彩系统与移动端响应式布局规范设计
 */

:root {
  /* 官方指定色彩系统 */
  --bg-primary: #07152D;
  --bg-deep-blue: #102A56;
  --brand-blue: #247BFF;
  --bright-blue: #4EB6FF;
  --aurora-cyan: #5CE1E6;
  --bg-light-blue: #F2F7FF;
  --white: #FFFFFF;
  --text-dark: #1E344F;
  --border-light: #DDE8F5;

  /* 辅助色彩与文字层级 */
  --text-muted: #627D98;
  --text-light-muted: #A4C2E8;
  --card-dark: #0D2248;
  --card-dark-border: rgba(78, 182, 255, 0.25);
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;

  /* 阴影与过渡 */
  --shadow-sm: 0 2px 8px rgba(7, 21, 45, 0.06);
  --shadow-md: 0 8px 24px rgba(7, 21, 45, 0.08);
  --shadow-lg: 0 16px 40px rgba(7, 21, 45, 0.12);
  --shadow-glow: 0 0 30px rgba(92, 225, 230, 0.2);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background-color: var(--white);
}

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

a:hover {
  color: var(--bright-blue);
}

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

/* 容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航栏 - 固定且不遮挡内容 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 21, 45, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(78, 182, 255, 0.15);
  transition: var(--transition);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo-img {
  height: 44px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: #C2D9F5;
  font-size: 15px;
  font-weight: 500;
  padding: 6px 2px;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--aurora-cyan);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--aurora-cyan);
  transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(78, 182, 255, 0.3);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--white);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 11px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand-blue) 0%, #1665D8 100%);
  color: var(--white);
  box-shadow: 0 4px 16px rgba(36, 123, 255, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--bright-blue) 0%, var(--brand-blue) 100%);
  color: var(--white);
  box-shadow: 0 6px 20px rgba(78, 182, 255, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(16, 42, 86, 0.6);
  border-color: rgba(78, 182, 255, 0.4);
  color: var(--white);
}

.btn-secondary:hover {
  background: rgba(36, 123, 255, 0.2);
  border-color: var(--bright-blue);
  color: var(--aurora-cyan);
}

.btn-outline-blue {
  background: transparent;
  border-color: var(--brand-blue);
  color: var(--brand-blue);
}

.btn-outline-blue:hover {
  background: var(--brand-blue);
  color: var(--white);
}

/* Hero 首屏 - 深蓝渐变与网络科技感 */
.hero-section {
  background: linear-gradient(165deg, var(--bg-primary) 0%, var(--bg-deep-blue) 100%);
  color: var(--white);
  padding: 70px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(36, 123, 255, 0.18) 0%, transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(92, 225, 230, 0.15) 0%, transparent 45%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(36, 123, 255, 0.18);
  border: 1px solid rgba(92, 225, 230, 0.4);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  color: var(--aurora-cyan);
  margin-bottom: 20px;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--aurora-cyan);
  box-shadow: 0 0 8px var(--aurora-cyan);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

.hero-title {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--white);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-title .brand-gradient {
  background: linear-gradient(135deg, var(--white) 30%, var(--aurora-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: #C2D9F5;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-disclaimer-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-light-muted);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-map-card {
  width: 100%;
  background: rgba(13, 34, 72, 0.65);
  border: 1px solid var(--card-dark-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-glow);
  position: relative;
}

/* 模块通用标题 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--brand-blue);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* 核心产品优势 - 4张简洁科技卡片 */
.advantages-section {
  background: var(--white);
  padding: 80px 0;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.adv-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.adv-card:hover {
  border-color: var(--bright-blue);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.adv-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--bg-light-blue);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border: 1px solid var(--border-light);
}

.adv-icon-box svg {
  width: 28px;
  height: 28px;
}

.adv-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.adv-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-muted);
  flex-grow: 1;
  margin-bottom: 16px;
}

.adv-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.adv-link:hover {
  color: var(--bright-blue);
  transform: translateX(4px);
}

/* 04 全球网络介绍 */
.network-section {
  background: var(--bg-light-blue);
  padding: 80px 0;
}

.network-map-wrapper {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  margin-bottom: 36px;
  border: 1px solid rgba(78, 182, 255, 0.2);
}

.network-regions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.region-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.region-card:hover {
  border-color: var(--brand-blue);
  box-shadow: var(--shadow-sm);
}

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

.region-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
}

.region-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-light-blue);
  color: var(--brand-blue);
}

.region-body {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* 05 套餐价格对比 */
.pricing-section {
  background: var(--white);
  padding: 80px 0;
}

.pricing-notice-box {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin-bottom: 36px;
  font-size: 13.5px;
  color: #92400E;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card.featured {
  border-color: var(--brand-blue);
  box-shadow: 0 12px 32px rgba(36, 123, 255, 0.15);
  transform: translateY(-6px);
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--brand-blue);
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  margin-bottom: 16px;
}

.plan-currency {
  font-size: 22px;
  font-weight: 700;
  color: var(--brand-blue);
}

.plan-price {
  font-size: 44px;
  font-weight: 800;
  color: var(--text-dark);
  margin: 0 4px;
  line-height: 1;
}

.plan-period {
  font-size: 14px;
  color: var(--text-muted);
}

.plan-traffic-highlight {
  background: var(--bg-light-blue);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-blue);
  margin-bottom: 20px;
}

.plan-features {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 13.5px;
  color: var(--text-dark);
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features li::before {
  content: "✓";
  color: var(--success);
  font-weight: 800;
}

.plan-suitable {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

/* 06 使用场景 - 4个场景 */
.scenarios-section {
  background: var(--bg-light-blue);
  padding: 80px 0;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.scenario-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--brand-blue);
  box-shadow: var(--shadow-md);
}

.scenario-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-light-blue);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.scenario-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.scenario-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 07 知识文章中心 - 6篇文章卡片与搜索 */
.articles-section {
  background: var(--white);
  padding: 80px 0;
}

.search-box-wrapper {
  max-width: 560px;
  margin: 0 auto 36px;
  position: relative;
}

.article-search-input {
  width: 100%;
  padding: 13px 44px 13px 18px;
  font-size: 14.5px;
  border: 1px solid var(--border-light);
  border-radius: 30px;
  outline: none;
  transition: var(--transition);
  background: var(--bg-light-blue);
}

.article-search-input:focus {
  border-color: var(--brand-blue);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(36, 123, 255, 0.15);
}

.search-icon {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--brand-blue);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.article-category {
  background: var(--bg-light-blue);
  color: var(--brand-blue);
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
}

.article-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card-title a {
  color: inherit;
}

.article-card-title a:hover {
  color: var(--brand-blue);
}

.article-card-summary {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

/* 08 新手使用流程 - 4步骤 */
.steps-section {
  background: var(--bg-light-blue);
  padding: 80px 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  position: relative;
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--brand-blue);
  box-shadow: var(--shadow-sm);
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--brand-blue);
  color: var(--white);
  font-size: 16px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 09 用户评价/真实反馈通道 */
.feedback-section {
  background: var(--white);
  padding: 80px 0;
}

.feedback-container-card {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-deep-blue) 100%);
  border-radius: var(--radius-lg);
  padding: 48px;
  color: var(--white);
  border: 1px solid rgba(78, 182, 255, 0.25);
  box-shadow: var(--shadow-lg);
}

.feedback-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.feedback-guidelines-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.feedback-guide-item {
  background: rgba(13, 34, 72, 0.6);
  border: 1px solid rgba(78, 182, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 18px 14px;
}

.feedback-guide-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--aurora-cyan);
  margin-bottom: 6px;
}

.feedback-guide-desc {
  font-size: 12.5px;
  color: #C2D9F5;
  line-height: 1.5;
}

.feedback-cta-box {
  background: rgba(16, 42, 86, 0.8);
  border: 1px solid rgba(92, 225, 230, 0.3);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
}

.feedback-cta-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.feedback-cta-desc {
  font-size: 13.5px;
  color: var(--text-light-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

/* 10 FAQ 常见问题手风琴 */
.faq-section {
  background: var(--bg-light-blue);
  padding: 80px 0;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-card:hover {
  border-color: var(--brand-blue);
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  padding: 18px 22px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--brand-blue);
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-card.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 22px;
}

.faq-card.open .faq-answer {
  max-height: 400px;
  padding-bottom: 20px;
}

.faq-answer-inner {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

/* 11 Footer 页脚 */
.site-footer {
  background: var(--bg-primary);
  color: #C2D9F5;
  padding: 70px 0 30px;
  border-top: 1px solid rgba(78, 182, 255, 0.15);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-light-muted);
  margin-top: 16px;
  max-width: 320px;
}

.footer-column-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

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

.footer-link {
  color: var(--text-light-muted);
  font-size: 14px;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--aurora-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(221, 232, 245, 0.12);
  padding-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-disclaimer-notice {
  font-size: 12px;
  color: #718BAE;
  margin-top: 12px;
  line-height: 1.6;
}

/* 文章详情页面专用样式 (Article Layout) */
.article-header-hero {
  background: linear-gradient(165deg, var(--bg-primary) 0%, var(--bg-deep-blue) 100%);
  color: var(--white);
  padding: 50px 0 60px;
  border-bottom: 1px solid rgba(78, 182, 255, 0.2);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light-muted);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: #C2D9F5;
}

.breadcrumbs a:hover {
  color: var(--aurora-cyan);
}

.article-hero-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  font-size: 13.5px;
  color: var(--text-light-muted);
}

.article-body-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding: 50px 0 80px;
  align-items: start;
}

/* 侧边大纲目录 */
.toc-sidebar {
  position: sticky;
  top: 90px;
  background: var(--bg-light-blue);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.toc-item a {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.45;
  display: block;
}

.toc-item a:hover, .toc-item.active a {
  color: var(--brand-blue);
  font-weight: 600;
  padding-left: 4px;
}

/* 文章正文排版规范 */
.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dark);
}

.article-content section {
  margin-bottom: 40px;
  scroll-margin-top: 100px;
}

.article-content h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-light);
}

.article-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin: 20px 0 10px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}

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

.article-content code {
  background: #E8F1FC;
  color: #1A56DB;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
}

/* 数据表格与清单卡片 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

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

.data-table th {
  background: var(--bg-light-blue);
  padding: 12px 16px;
  font-weight: 700;
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-dark);
}

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

.table-footnote {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: -12px;
  margin-bottom: 20px;
}

.checklist-card {
  background: var(--bg-light-blue);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--brand-blue);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 24px 0;
}

.checklist-card h3 {
  margin-top: 0;
  font-size: 16px;
  color: var(--brand-blue);
}

.checklist-card ul {
  list-style: none;
  margin: 10px 0 0 0;
}

.checklist-card li {
  font-size: 14px;
  margin-bottom: 6px;
}

.formula-box {
  background: #EEF4FF;
  border: 1px solid #C7D9FD;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 15px;
  color: #1E40AF;
  margin: 18px 0;
}

/* 底部文章横幅 CTA */
.article-cta-box {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-deep-blue) 100%);
  border-radius: var(--radius-md);
  padding: 32px;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 48px 0;
}

.article-cta-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 6px;
}

.article-cta-desc {
  font-size: 14px;
  color: var(--text-light-muted);
}

/* 相关文章推荐 */
.related-articles-section {
  border-top: 1px solid var(--border-light);
  padding-top: 40px;
  margin-top: 40px;
}

.related-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}

/* 反馈互动模态框 */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(7, 21, 45, 0.7);
  backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-dialog {
  background: var(--white);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
}

.form-control:focus {
  border-color: var(--brand-blue);
  box-shadow: 0 0 0 2px rgba(36, 123, 255, 0.15);
}

/* 404 & Sitemap 页面通用布局 */
.info-page-container {
  padding: 60px 0 100px;
  max-width: 880px;
}

.info-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

/* 响应式断点适配 (360px, 390px, 768px, 1024px, 1440px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin: 0 auto 32px;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-disclaimer-tag {
    justify-content: center;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .network-regions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .toc-sidebar {
    display: none; /* 移动端/平板端切换为内嵌目录 */
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid rgba(78, 182, 255, 0.2);
    gap: 16px;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-actions .btn {
    display: none;
  }
  .hero-title {
    font-size: 30px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .network-regions-grid {
    grid-template-columns: 1fr;
  }
  .feedback-grid {
    grid-template-columns: 1fr;
  }
  .feedback-guidelines-list {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .article-cta-box {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 390px) {
  .hero-title {
    font-size: 26px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .btn {
    width: 100%;
  }
}