/* 鱼鱼的超级机场 Stylesheet */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  
  --primary-blue: #2563eb;
  --primary-blue-hover: #1d4ed8;
  --accent-blue-light: #e0e7ff;
  --accent-cyan: #0284c7;
  --dark-btn-bg: #334155;
  --dark-btn-hover: #1e293b;
  
  --border-light: #e2e8f0;
  --border-focus: #3b82f6;
  
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px 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 25px -5px rgba(37,99,235,0.1), 0 8px 10px -6px rgba(0,0,0,0.04);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1200px;
}

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

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

body {
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  background: linear-gradient(180deg, #f0f7ff 0%, #f8fafc 400px, #ffffff 100%);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-blue);
  letter-spacing: -0.01em;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--primary-blue);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--primary-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}

.btn-dark {
  background: var(--dark-btn-bg);
  color: #ffffff;
}

.btn-dark:hover {
  background: var(--dark-btn-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary-blue);
  color: var(--primary-blue);
}

.btn-outline:hover {
  background: var(--accent-blue-light);
  color: var(--primary-blue-hover);
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* Hero Section */
.hero {
  padding-top: 140px;
  padding-bottom: 70px;
  text-align: center;
  background: radial-gradient(circle at 50% 10%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero-main-title {
  font-size: 3.5rem;
  font-weight: 900;
  color: #0f172a;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--primary-blue);
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

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

.hero-domain-highlight {
  display: inline-block;
  background: #eff6ff;
  color: var(--primary-blue);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-weight: 700;
  border: 1px dashed #bfdbfe;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

/* Rating Badge Box */
.rating-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #ffffff;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  margin-bottom: 50px;
}

.stars {
  color: #f59e0b;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

.rating-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.rating-score {
  font-weight: 800;
  color: var(--text-main);
  font-size: 1.1rem;
}

/* Stats Section Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 20px;
  margin-bottom: 60px;
}

.stat-card {
  background: #ffffff;
  padding: 28px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #bfdbfe;
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 6px;
}

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

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

.section-title-wrap {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #0f172a;
  display: inline-block;
  position: relative;
}

.section-title-underline {
  position: relative;
  display: inline-block;
}

.section-title-underline::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-blue);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: #ffffff;
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: #93c5fd;
}

.feature-icon {
  width: 54px;
  height: 54px;
  background: #eff6ff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* Pricing Section */
.pricing-section {
  background: #f1f5f9;
}

.pricing-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.tab-btn {
  padding: 10px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  background: #ffffff;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active {
  background: var(--primary-blue);
  color: #ffffff;
  border-color: var(--primary-blue);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.price-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 36px 30px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.price-card.popular {
  border: 2px solid var(--primary-blue);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.15);
  transform: translateY(-6px);
}

.popular-tag {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--primary-blue);
  color: #ffffff;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.price-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 8px;
}

.price-card .price-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 24px;
}

.price-amount span {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

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

.price-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.price-features li svg {
  color: #10b981;
  flex-shrink: 0;
}

/* Articles Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.article-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-blue);
  background: #eff6ff;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link {
  color: var(--primary-blue);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

/* Testimonials / Reviews Section */
.reviews-section {
  background: #ffffff;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: #f8fafc;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--primary-blue);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.user-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
}

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

.review-content {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  font-style: italic;
}

/* FAQ Section */
.faq-section {
  background: #f1f5f9;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition);
}

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

.faq-question:hover {
  color: var(--primary-blue);
}

.faq-icon {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  padding: 0 24px 20px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
}

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

/* Article Page Specific Styling */
.article-header {
  text-align: center;
  padding-top: 130px;
  padding-bottom: 40px;
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  max-width: 860px;
  margin: 0 auto 60px auto;
  background: #ffffff;
  padding: 40px 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.article-content h2 {
  font-size: 1.6rem;
  color: #0f172a;
  margin: 32px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid #eff6ff;
}

.article-content h3 {
  font-size: 1.25rem;
  color: #1e293b;
  margin: 24px 0 12px 0;
}

.article-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
  color: var(--text-secondary);
}

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

.article-cta-box {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  margin: 36px 0;
}

.article-cta-box h3 {
  color: var(--primary-blue-hover);
  margin-top: 0;
  margin-bottom: 8px;
}

.article-cta-box p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.related-articles {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.related-articles h3 {
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.related-articles ul {
  list-style: disc;
  margin-left: 20px;
}

.related-articles a {
  color: var(--primary-blue);
  text-decoration: none;
  font-weight: 500;
}

.related-articles a:hover {
  text-decoration: underline;
}

/* Footer Section & PBN Pipe (Core Task 2) */
footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 40px 0;
  border-top: 1px solid #1e293b;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 0.9rem;
  color: #64748b;
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* PBN Friendly Links Zone */
.footer-pbn-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.85rem;
  color: #64748b;
  margin: 20px 0;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  display: inline-flex;
}

.pbn-label {
  color: #475569;
  font-weight: 500;
}

.pbn-link {
  color: #94a3b8;
  text-decoration: none;
  transition: var(--transition);
}

.pbn-link:hover {
  color: #38bdf8;
  text-decoration: underline;
}

.copyright {
  font-size: 0.82rem;
  color: #475569;
  margin-top: 20px;
}

/* Responsive Breakdown */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .pricing-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-main-title {
    font-size: 2.75rem;
  }
  .hero-subtitle {
    font-size: 2.1rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-main-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.65rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .pricing-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}

/* Download Modal / Dialog Styles */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  padding: 16px;
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  max-width: 480px;
  width: 100%;
  padding: 32px 28px 24px 28px;
  position: relative;
  text-align: center;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid var(--border-light);
}

.modal-backdrop.active .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  background: #f1f5f9;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close-btn:hover,
.modal-close-btn:focus-visible {
  background: #e2e8f0;
  color: var(--text-main);
  outline: none;
}

.modal-icon-badge {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--accent-blue-light);
  color: var(--primary-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 24px;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.btn-platform {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 13px 20px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-platform-android {
  background: #2563eb;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-platform-android:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.btn-platform-ios {
  background: #0f172a;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.2);
}

.btn-platform-ios:hover {
  background: #1e293b;
  transform: translateY(-1px);
}

.modal-tip {
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-light);
  padding-top: 14px;
}