/* ==========================================================================
   宝妈云机场 Baoma Cloud Airport - CSS Design System (White/Light Theme)
   Domain: baomacloud.homes
   ========================================================================== */

:root {
  --bg-dark: #ffffff;
  --bg-card: #f8fafc;
  --bg-card-hover: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.9);
  --border-color: #e2e8f0;
  --border-accent: rgba(2, 132, 199, 0.3);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --color-cyan: #0284c7;
  --color-cyan-hover: #0369a1;
  --color-emerald: #059669;
  --color-amber: #d97706;
  --color-rose: #e11d48;
  
  --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 20px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 6px 24px rgba(2, 132, 199, 0.12);
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
}

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

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

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 72px;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-logo img {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.brand-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--color-cyan);
  border: 1px solid rgba(2, 132, 199, 0.2);
  border-radius: var(--radius-full);
  font-weight: 500;
}

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-cyan);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.25);
}

.btn-primary:hover {
  background: var(--color-cyan-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.35);
}

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

.btn-outline:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.btn-secondary {
  background: rgba(5, 150, 105, 0.1);
  color: var(--color-emerald);
  border: 1px solid rgba(5, 150, 105, 0.25);
}

.btn-secondary:hover {
  background: rgba(5, 150, 105, 0.18);
  color: var(--color-emerald);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 130px 0 70px;
  position: relative;
  background: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.05) 0%, #ffffff 70%);
}

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

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag-badge {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.tag-badge.featured {
  background: rgba(225, 29, 72, 0.08);
  color: var(--color-rose);
  border-color: rgba(225, 29, 72, 0.25);
  font-weight: 600;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 32px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.stat-item h4 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-cyan);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-card-preview {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.preview-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-emerald);
  font-weight: 600;
}

.dot-online {
  width: 8px;
  height: 8px;
  background-color: var(--color-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(5, 150, 105, 0.4);
}

.preview-body p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

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

.feature-list-mini li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.feature-list-mini svg {
  color: var(--color-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   Section Styling
   ========================================================================== */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px;
}

.section-subtitle {
  color: var(--color-cyan);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Pricing Section
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-cyan);
  box-shadow: var(--shadow-glow);
}

.pricing-card.popular {
  border-color: var(--color-cyan);
  background: linear-gradient(180deg, rgba(2, 132, 199, 0.03) 0%, #ffffff 100%);
  box-shadow: var(--shadow-md);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-cyan);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 14px;
  border-radius: var(--radius-full);
}

.pricing-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.pricing-price {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-price span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 20px 0 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-features svg {
  color: var(--color-cyan);
  flex-shrink: 0;
}

.coupon-box {
  margin-top: 40px;
  background: rgba(2, 132, 199, 0.04);
  border: 1px dashed rgba(2, 132, 199, 0.3);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.coupon-code {
  font-family: monospace;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-cyan);
  background: #ffffff;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(2, 132, 199, 0.2);
}

/* ==========================================================================
   Nodes Showcase
   ========================================================================== */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.node-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.node-card:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-2px);
}

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

.node-flag {
  font-size: 1.5rem;
}

.node-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-ping {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-emerald);
}

/* ==========================================================================
   Clients Download & Guides
   ========================================================================== */
.client-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--color-cyan);
  color: #ffffff;
  border-color: var(--color-cyan);
}

.tab-content {
  display: none;
}

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

.client-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.client-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.client-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.client-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* ==========================================================================
   Articles Grid & Reader Layout
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--text-primary);
}

.article-title a:hover {
  color: var(--color-cyan);
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Single Article Layout */
.article-header-section {
  padding: 120px 0 40px;
  background: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.05) 0%, #ffffff 70%);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

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

.article-single-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.article-content-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding: 60px 0;
}

.article-toc {
  position: sticky;
  top: 100px;
  height: fit-content;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

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

.toc-list a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: block;
}

.toc-list a:hover {
  color: var(--color-cyan);
}

.article-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.6rem;
  color: var(--text-primary);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

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

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-body blockquote {
  background: rgba(2, 132, 199, 0.05);
  border-left: 4px solid var(--color-cyan);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-primary);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.06) 0%, #f8fafc 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  margin-top: 0;
  color: var(--text-primary);
}

/* ==========================================================================
   Reviews & FAQ
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(2, 132, 199, 0.1);
  color: var(--color-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.user-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.stars {
  color: var(--color-amber);
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: none;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-icon {
  transition: var(--transition);
  color: var(--text-muted);
}

/* ==========================================================================
   Footer & PBN Injection Area (Core Task 2)
   ========================================================================== */
.site-footer {
  background: #f8fafc;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 24px;
  margin-top: auto;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* Precise Low-key PBN Links Area */
.footer-friend-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  width: 100%;
  max-width: 600px;
}

.footer-friend-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  transition: var(--transition);
}

.footer-friend-links a:hover {
  color: var(--color-cyan);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-grid,
  .nodes-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-content-wrapper {
    grid-template-columns: 1fr;
  }
  .article-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2rem;
  }
  .pricing-grid,
  .nodes-grid,
  .articles-grid,
  .reviews-grid,
  .tab-content.active {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}