/* ==========================================================================
   极速cloud机场官网 - 核心样式表 (style.css)
   极白纯净主题 (Pure White Light Theme)，原生 CSS，零重型框架，秒开级高性能
   严格遵循 WCAG 2.1 AA/AAA 无障碍色彩对比度规范 (对比度最高达 16:1)
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --secondary: #0284c7;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --success: #10b981;
  
  /* 极白色与浅色层级定义 */
  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --surface: #f1f5f9;
  --surface-border: #e2e8f0;
  --surface-border-subtle: #edf2f7;
  
  /* 高对比度文本系统 */
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #475569;
  --text-dim: #64748b;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* 优雅浅色阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.12);
  
  --max-width: 1200px;
  --header-height: 72px;
}

/* 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", "WenQuanYi Micro Hei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-body);
  background-color: var(--bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg);
}

/* 锚点滚动补偿 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* 键盘可访问性：跳到主要内容 */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary);
  color: #ffffff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 15px;
  outline: 3px solid #2563eb;
}

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

/* 导航栏 Header - 极白半透磨砂玻璃效果 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  fill: var(--primary);
}

.brand-logo:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover {
  color: var(--primary);
  background-color: rgba(37, 99, 235, 0.06);
}

.nav-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  color: var(--primary);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 18px;
  background: linear-gradient(135deg, var(--primary), #1d4ed8);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  min-height: 44px;
  min-width: 44px;
}

.nav-cta-btn:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.nav-cta-btn:focus-visible {
  outline: 3px solid #bfdbfe;
  outline-offset: 2px;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1rem;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  min-height: 44px;
  min-width: 44px;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: #f8fafc;
  color: var(--text-main);
  border-color: #cbd5e1;
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
  transform: translateY(-1px);
}

.btn-accent {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.35);
  transform: translateY(-2px);
}

.btn:focus-visible {
  outline: 3px solid #2563eb;
  outline-offset: 3px;
}

/* 主视觉区 Hero - 极白背景搭配微蓝光晕 */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  background: radial-gradient(circle at 50% 10%, rgba(37, 99, 235, 0.08) 0%, #ffffff 70%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.1rem, 4vw + 1rem, 3.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #1d4ed8 0%, #0284c7 60%, #4338ca 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.5vw + 0.5rem, 1.25rem);
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-trust-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin-top: 20px;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.hero-trust-item svg {
  width: 18px;
  height: 18px;
  fill: #059669;
  flex-shrink: 0;
}

/* 区块统一间距与标题 */
.section {
  padding: 72px 0;
  background-color: #ffffff;
}

.section-alt {
  background-color: #f8fafc;
  border-top: 1px solid var(--surface-border);
  border-bottom: 1px solid var(--surface-border);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  color: #0284c7;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.75rem, 2.5vw + 0.5rem, 2.4rem);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 核心优势 3 个图文卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.1);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  border: 1px solid #dbeafe;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
  fill: #2563eb;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-body);
}

.feature-list li svg {
  width: 15px;
  height: 15px;
  fill: #2563eb;
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 */
.unlock-showcase {
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.unlock-card {
  background: #f8fafc;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.unlock-card-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}

.unlock-card-title svg {
  width: 26px;
  height: 26px;
  fill: #0284c7;
}

.unlock-card-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.badge-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.service-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.service-badge.active {
  background: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

/* 套餐价格对比表 */
.pricing-wrapper {
  margin-top: 20px;
}

.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.pricing-table caption {
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--text-dim);
  text-align: left;
  background-color: #f8fafc;
  border-bottom: 1px solid var(--surface-border);
}

.pricing-table th,
.pricing-table td {
  padding: 18px 20px;
  vertical-align: middle;
  border-bottom: 1px solid var(--surface-border);
}

.pricing-table th {
  background: #f1f5f9;
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.95rem;
}

.pricing-table tbody tr:hover {
  background-color: #f8fafc;
}

.pricing-table .tier-name {
  font-weight: 700;
  color: var(--text-main);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-table .popular-badge {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.pricing-table .price-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: #1d4ed8;
}

.pricing-table .price-period {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 400;
}

.pricing-table .table-cta {
  white-space: nowrap;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: #f59e0b;
}

.review-content {
  color: var(--text-body);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #1d4ed8;
  font-size: 0.95rem;
  border: 1px solid #dbeafe;
}

.author-info h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 常见问题 FAQ (语义化 details/summary，默认展开) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq-item:hover {
  border-color: #93c5fd;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  fill: #64748b;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  fill: var(--primary);
}

.faq-answer {
  padding: 0 24px 22px;
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.75;
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
}

.faq-answer p:not(:last-child) {
  margin-bottom: 12px;
}

.faq-answer a {
  color: #1d4ed8;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}

.faq-answer a:hover {
  color: #2563eb;
}

/* 知识科普专区与文章卡片 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.1);
}

.article-card:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
}

/* 文章详情页样式 */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

.article-main-title {
  font-size: clamp(1.8rem, 3vw + 0.5rem, 2.6rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 18px;
}

.article-info-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body {
  max-width: 820px;
  margin: 0 auto 60px;
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  line-height: 1.8;
  color: var(--text-body);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--surface-border);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1d4ed8;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
  font-size: 1rem;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
}

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

.article-body a {
  color: #1d4ed8;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}

.article-body a:hover {
  color: #2563eb;
}

.article-callout {
  background: #eff6ff;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 24px 0;
  color: #1e3a8a;
}

.article-callout strong {
  color: #1d4ed8;
}

.article-cta-box {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h3 {
  color: var(--text-main);
  margin-bottom: 10px;
  font-size: 1.35rem;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* 页脚 Footer - 极简白净底栏 */
.site-footer {
  margin-top: auto;
  background-color: #f8fafc;
  border-top: 1px solid var(--surface-border);
  padding: 48px 0 32px;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background-color 0.2s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer-link:hover {
  color: var(--primary);
  background-color: rgba(37, 99, 235, 0.06);
}

.footer-link:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  color: var(--primary);
}

.footer-disclaimer {
  max-width: 820px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
}

/* 单页面信息页样式 (About, Terms, Privacy, Sitemap) */
.page-header {
  padding: 60px 0 30px;
  text-align: center;
}

.page-title {
  font-size: clamp(1.8rem, 3vw + 0.5rem, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.page-content-box {
  max-width: 860px;
  margin: 0 auto 60px;
  background: #ffffff;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  line-height: 1.8;
  color: var(--text-body);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.page-content-box h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 32px 0 14px;
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 8px;
}

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

.page-content-box ul {
  margin: 14px 0 20px 24px;
}

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

.sitemap-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  list-style: none;
  padding: 0;
  margin-top: 24px;
}

.sitemap-list-item a {
  display: block;
  background: #f8fafc;
  border: 1px solid var(--surface-border);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
}

.sitemap-list-item a:hover {
  background: #ffffff;
  border-color: var(--primary);
  color: var(--primary);
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

/* 响应式设计：手机端适配 (@media) */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }
  
  .site-header {
    padding: 12px 0;
  }
  
  .header-container {
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .nav-menu {
    order: 3;
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--surface-border);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .unlock-grid {
    grid-template-columns: 1fr;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .sitemap-list {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }
  
  .article-body,
  .page-content-box,
  .unlock-showcase {
    padding: 24px 18px;
  }
}

@media (max-width: 390px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .hero-title {
    font-size: 1.85rem;
  }
  
  .btn {
    padding: 12px 20px;
    font-size: 0.95rem;
  }
}

/* 动效降级适配 */
@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;
  }
}