/* ==========================================================================
   贝贝云 (Beibei Cloud) - 官方极简原生样式表
   配色体系: #FFFFFF (底色), #0066FF (电光蓝), #0A0A0A (主文字), #F4F4F5 (背景与浅灰)
   ========================================================================== */

:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F4F4F5;
  --bg-card: #FFFFFF;
  --text-main: #0A0A0A;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --accent-blue: #0066FF;
  --accent-hover: #0052CC;
  --accent-light: rgba(0, 102, 255, 0.08);
  --border-subtle: #E4E4E7;
  --border-focus: #0066FF;
  --shadow-sm: 0 2px 8px rgba(10, 10, 10, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 102, 255, 0.06);
  --shadow-hover: 0 12px 32px rgba(0, 102, 255, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --container-max: 1200px;
  --font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image: 
    linear-gradient(to right, rgba(0, 102, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

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

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

/* 导航栏 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #0066FF 0%, #00C6FF 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-size: 18px;
  font-weight: 800;
}

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

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: #334155;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-blue);
}

.nav-badge {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent-blue);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 4px;
  font-weight: 600;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(0, 102, 255, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 102, 255, 0.35);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background-color: #E4E4E7;
  color: var(--accent-blue);
  border-color: #CBD5E1;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
}

/* 主视觉区 (Hero) */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: var(--accent-light);
  border: 1px solid rgba(0, 102, 255, 0.18);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 24px;
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-blue);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title span {
  color: var(--accent-blue);
  position: relative;
  display: inline-block;
}

.hero-subhead {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-item h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 4px;
}

.stat-item p {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* 区块通用样式 */
.section-pad {
  padding: 80px 0;
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  color: var(--accent-blue);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  display: inline-block;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
}

/* 核心优势三卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  background-color: var(--accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--accent-blue);
  margin-bottom: 22px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.media-ai-card {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: all 0.25s ease;
}

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

.media-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
}

.media-ai-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.media-ai-card p {
  font-size: 13px;
  color: var(--text-muted);
}

.status-badge {
  margin-top: 12px;
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  background-color: #DCFCE7;
  color: #15803D;
  border-radius: 20px;
}

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

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-blue);
}

.pricing-card.popular {
  border: 2px solid var(--accent-blue);
  box-shadow: var(--shadow-md);
  transform: scale(1.03);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-blue);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.pricing-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.price-unit {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-blue);
}

.price-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: #334155;
  margin-bottom: 12px;
}

.plan-features li::before {
  content: "✔";
  color: var(--accent-blue);
  font-weight: 900;
  font-size: 13px;
}

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

.review-card {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #F59E0B;
  font-size: 16px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 14px;
  color: #334155;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-blue);
  border: 1px solid var(--border-subtle);
}

.reviewer-meta h5 {
  font-size: 14px;
  font-weight: 600;
}

.reviewer-meta p {
  font-size: 12px;
  color: var(--text-muted);
}

/* 常见问题 (FAQ) */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}

.faq-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.faq-item h3::before {
  content: "Q";
  display: inline-block;
  width: 24px;
  height: 24px;
  background-color: var(--accent-light);
  color: var(--accent-blue);
  border-radius: 4px;
  text-align: center;
  line-height: 24px;
  font-size: 13px;
  font-weight: 800;
}

.faq-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  padding-left: 32px;
}

/* 页脚 (只保留4个标题入口，打开新页面) */
.footer-wrap {
  background-color: #0A0A0A;
  color: #94A3B8;
  padding: 50px 0 30px;
  margin-top: 60px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.footer-links a {
  color: #CBD5E1;
  font-size: 15px;
  font-weight: 500;
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #64748B;
}

/* 文章与资讯内页样式 */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
}

.article-header h1 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text-main);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 60px;
}

.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text-main);
  border-left: 4px solid var(--accent-blue);
  padding-left: 12px;
}

.article-content h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: #1E293B;
}

.article-content p {
  font-size: 15px;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 18px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 20px 24px;
  color: #334155;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.article-content blockquote {
  border-left: 4px solid #CBD5E1;
  padding: 12px 18px;
  background-color: var(--bg-secondary);
  color: #475569;
  font-size: 14px;
  margin-bottom: 20px;
  border-radius: 0 8px 8px 0;
}

.article-content a.seo-link {
  color: var(--accent-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a.seo-link:hover {
  color: var(--accent-hover);
}

/* 资讯列表网格 */
.news-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.news-card {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

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

.news-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  background: var(--accent-light);
  color: var(--accent-blue);
  border-radius: 4px;
  margin-bottom: 12px;
}

.news-card h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.news-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.news-card .read-more {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 移动端响应式 (@media) */
@media (max-width: 992px) {
  .hero-title {
    font-size: 38px;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .media-ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .news-list-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-inner {
    flex-direction: column;
    height: auto;
    padding: 14px 0;
    gap: 12px;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
  .hero-section {
    padding: 40px 0;
  }
  .hero-title {
    font-size: 30px;
  }
  .hero-subhead {
    font-size: 16px;
  }
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  .hero-buttons .btn {
    width: 100%;
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .footer-top {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
  .article-content {
    padding: 24px 16px;
  }
  .article-header h1 {
    font-size: 26px;
  }
}