/* ==========================================================
   可信云 (kexinyun) 原生极简轻量级样式表 · 浅色主题 (Light Mode)
   零外部依赖 · 纯原生 CSS · 现代化清爽质感 · 秒开级加载速度
   ========================================================== */

:root {
  --bg-main: #f8fafc;           /* 页面主背景：浅灰白 */
  --bg-card: #ffffff;           /* 卡片与容器：纯白 */
  --bg-card-hover: #f1f5f9;     /* 悬浮背景 */
  --bg-card-alt: #f1f5f9;       /* 交替区块背景 */
  --border-color: #e2e8f0;      /* 基础边框线 */
  --border-highlight: #2563eb;  /* 高亮边框线 */
  
  --primary: #2563eb;           /* 品牌主色：科技蓝 */
  --primary-hover: #1d4ed8;     /* 悬停深蓝 */
  --primary-light: #3b82f6;     /* 浅蓝 */
  --accent: #0284c7;            /* 青蓝 */
  --accent-purple: #7c3aed;     /* 科技紫 */
  --success: #059669;           /* 成功绿 */
  --warning: #d97706;           /* 警告橙 */

  --text-main: #0f172a;         /* 主文字：深沉黑灰 */
  --text-muted: #475569;        /* 次要文字：中灰 */
  --text-dim: #64748b;          /* 弱化辅助字 */

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 15px -1px rgba(0, 0, 0, 0.06), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 30px -4px rgba(0, 0, 0, 0.08);
  --shadow-primary: 0 6px 20px rgba(37, 99, 235, 0.25);
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-main);
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-color: var(--bg-main);
  color: var(--text-main);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 通用按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  min-height: 48px;
  text-align: center;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #0369a1 100%);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  background-color: #f8fafc;
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

/* 顶部通知栏 */
.top-notice {
  background: linear-gradient(90deg, #1e40af, #0369a1);
  color: #ffffff;
  font-size: 0.85rem;
  padding: 8px 16px;
  text-align: center;
  font-weight: 500;
}
.top-notice a {
  text-decoration: underline;
  margin-left: 6px;
  font-weight: bold;
  color: #e0f2fe;
}
.top-notice a:hover {
  color: #ffffff;
}

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03);
}

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

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

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.25);
}

.brand-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #0f172a, #2563eb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-links a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
}

.nav-links a:hover {
  color: var(--primary);
}

/* Hero 视觉区 */
.hero {
  position: relative;
  padding: 85px 0 75px;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.hero-glow {
  position: absolute;
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 380px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, rgba(6, 182, 212, 0.04) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  color: #0f172a;
  margin-bottom: 20px;
}

.hero-title-highlight {
  background: linear-gradient(90deg, #2563eb, #0284c7, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 760px;
  margin: 0 auto 36px;
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 44px;
}

/* 首页主视觉园区大图展示 */
.hero-image-container {
  max-width: 960px;
  margin: 0 auto 48px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.hero-image-container:hover .hero-image {
  transform: scale(1.015);
}

.hero-image-caption {
  position: absolute;
  bottom: 16px;
  left: 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px rgba(5, 150, 105, 0.6);
}

/* 核心指标统计 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1;
  margin-bottom: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

/* 章节通用标题 */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 55px;
}

.section-tag {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* 核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  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: var(--shadow-md);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: #eff6ff;
  border: 1px solid #dbeafe;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #0f172a;
}

.feature-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 流媒体与 AI 支持专区 */
.unlock-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

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

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

.unlock-cat-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #0f172a;
}

.unlock-cat-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

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

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  background-color: #ffffff;
  border: 1px solid #cbd5e1;
  color: #334155;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.tag-ai {
  border-color: #ddd6fe;
  background-color: #f5f3ff;
  color: #6d28d9;
}

.tag-media {
  border-color: #bae6fd;
  background-color: #f0f9ff;
  color: #0369a1;
}

/* 价格套餐对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  background: #ffffff;
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #2563eb, #0284c7);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
}

.plan-price {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: #0f172a;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #334155;
}

.check-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--primary);
}

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

.review-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
}

.review-rating {
  color: #f59e0b;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #60a5fa);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
}

.author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #0f172a;
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* 原生 FAQ 手风琴 (使用 details / summary) */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 700;
  font-size: 1.05rem;
  color: #0f172a;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-dim);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "−";
  color: var(--primary);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* 底部 CTA 通栏 */
.cta-banner {
  text-align: center;
  padding: 75px 20px;
  background: linear-gradient(180deg, #f1f5f9 0%, #ffffff 100%);
  border-top: 1px solid var(--border-color);
}

.cta-banner-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 14px;
}

.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 30px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 页脚：严格只保留 4 个标题并在新页面打开展示 */
.footer {
  background-color: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 45px 0 35px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 1rem;
  font-weight: 600;
  color: #475569;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background-color 0.2s;
}

.footer-nav a:hover {
  color: var(--primary);
  background-color: #f1f5f9;
}

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

/* 内容详情子页面专用样式 (关于我们 / 服务条款 / 隐私政策 / 网站地图) */
.page-container {
  max-width: 860px;
  margin: 40px auto 80px;
  padding: 40px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.page-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 16px;
}

.page-subtitle {
  font-size: 0.95rem;
  color: var(--text-dim);
  margin-bottom: 36px;
}

.page-section {
  margin-bottom: 36px;
}

.page-section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-section p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

.page-section ul {
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 14px;
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
}

.back-home:hover {
  text-decoration: underline;
}

/* ==========================================================
   高科技网格卡片 (Grid Cards) 布局 & 深度 SEO 文章排版
   ========================================================== */

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

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.article-card-header {
  margin-bottom: 12px;
}

.article-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: #eff6ff;
  color: var(--primary);
  border: 1px solid #dbeafe;
  margin-bottom: 10px;
}

.article-badge-hot {
  background: #fef2f2;
  color: #dc2626;
  border-color: #fecaca;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.45;
  margin-bottom: 10px;
}

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

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.article-card-link {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-card-link:hover {
  text-decoration: underline;
}

/* 文章详情页样式 */
.article-container {
  max-width: 880px;
  margin: 40px auto 80px;
  padding: 48px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.02rem;
  line-height: 1.85;
  color: #334155;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: #0f172a;
  margin: 36px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 18px;
}

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

.article-body a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--primary-hover);
}

.article-nav-back {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

/* ==========================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与手指友好触控
   ========================================================== */

@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .nav-container {
    height: 64px;
  }

  .nav-links {
    display: none; /* 移动端精简，突出强化主 CTA */
  }

  .hero {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }

  .hero-desc {
    font-size: 1rem;
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-actions .btn {
    width: 100%;
    min-height: 52px; /* 适合移动端拇指触控 */
    font-size: 1.05rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

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

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

  .unlock-box {
    padding: 24px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .stat-value {
    font-size: 1.8rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .hero-image-container {
    margin-bottom: 32px;
    border-radius: var(--radius-md);
  }

  .hero-image-caption {
    bottom: 10px;
    left: 10px;
    font-size: 0.75rem;
    padding: 4px 12px;
  }

  .page-container,
  .article-container {
    padding: 24px 18px;
    margin: 20px auto 40px;
  }

  .page-title {
    font-size: 1.7rem;
  }
}