/* 咕嘎云 Guga Cloud - 极简现代化 CSS */
:root {
  --bg-color: #FFFFFF;
  --bg-subtle: #F9FAFB;
  --bg-card: #FFFFFF;
  --text-main: #0A0E27;
  --text-muted: #4B5563;
  --text-light: #9CA3AF;
  --accent-blue: #3B82F6;
  --accent-hover: #1D4ED8;
  --accent-light: #EFF6FF;
  --border-color: #E5E7EB;
  --border-focus: #3B82F6;
  --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 -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --max-width: 1200px;
}

*, *::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: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

/* 导航栏 (Sticky Navbar) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.25s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  color: var(--accent-blue);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

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

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
  line-height: 1.4;
  min-height: 44px;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn-outline {
  background-color: #FFFFFF;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--text-main);
  background-color: var(--bg-subtle);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
  min-height: 50px;
}

.btn-full {
  width: 100%;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 96px 0 64px 0;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: var(--accent-light);
  color: var(--accent-blue);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-blue);
  box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(59, 130, 246, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-main);
  max-width: 900px;
  margin: 0 auto 24px auto;
}

.hero-title span {
  color: var(--accent-blue);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 40px auto;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: var(--text-light);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

.hero-guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

/* 品牌背书与流媒体条 (Logo Cloud Strip) */
.logo-strip-section {
  padding: 40px 0 56px 0;
  border-bottom: 1px solid var(--border-color);
}

.logo-strip-label {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.logo-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  opacity: 0.85;
}

.logo-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  transition: all 0.2s ease;
}

.logo-item:hover {
  border-color: var(--accent-blue);
  color: var(--text-main);
  background-color: var(--bg-color);
  transform: translateY(-2px);
}

/* 统计数据行 (Stats Row) */
.stats-section {
  padding: 64px 0;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
}

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

.stat-item {
  padding: 16px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.stat-number span {
  color: var(--accent-blue);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 核心特性区 (Features 3 Columns) */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  background-color: #F8FAFC;
  transform: translateY(-4px);
  box-shadow: 0 12px 24px -10px rgba(59, 130, 246, 0.15);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--accent-light);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.08);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 流媒体与 AI 支持图卡 (Media & AI Grid) */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.media-ai-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  background-color: var(--bg-card);
  transition: all 0.3s ease;
}

.media-ai-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: var(--shadow-md);
}

.media-ai-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.media-ai-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--accent-light);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.media-ai-header h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.media-ai-tagline {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.supported-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.supported-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.supported-pill svg {
  width: 16px;
  height: 16px;
  color: var(--accent-blue);
}

/* 价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

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

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

.pricing-card.featured {
  border: 2px solid var(--accent-blue);
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent-blue);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pricing-header {
  margin-bottom: 24px;
  text-align: left;
}

.pricing-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 20px 0;
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.pricing-cycle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 24px 0 36px 0;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-main);
  margin-bottom: 14px;
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-blue);
  flex-shrink: 0;
}

/* 用户评价 (Testimonials) */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  background-color: var(--bg-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--accent-light);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

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

/* 常见问题解答 (FAQ) */
.faq-grid {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.faq-question {
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 页脚 (Footer) - 严格遵循只保留4个标题要求 */
.footer {
  background-color: #FAFAFA;
  border-top: 1px solid var(--border-color);
  padding: 64px 0 40px 0;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  transition: color 0.2s ease;
  padding: 8px 12px;
}

.footer-link:hover {
  color: var(--accent-blue);
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  padding-top: 28px;
}

/* 文章详情页与文章列表页特定样式 */
.article-header {
  padding: 64px 0 32px 0;
  border-bottom: 1px solid var(--border-color);
}

.article-meta {
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.article-content {
  max-width: 800px;
  margin: 48px auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #1F2937;
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 36px 0 16px 0;
  color: var(--text-main);
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 24px 0 12px 0;
  color: var(--text-main);
}

.article-content p {
  margin-bottom: 20px;
}

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

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

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

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

.article-callout {
  background-color: var(--bg-subtle);
  border-left: 4px solid var(--accent-blue);
  padding: 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 28px 0;
}

.articles-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
  margin: 48px 0;
}

.article-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  background-color: var(--bg-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

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

/* 响应式媒体查询 (@media) */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero-section {
    padding: 56px 0 40px 0;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}