/* ==========================================================================
   FeijiCloud (飞机云) - Core Design System & Stylesheet
   Theme: High-Tech Sky Blue & Cloud Glassmorphism (Non-Black Background)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.4);
  --bg-gradient: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 35%, #bae6fd 70%, #f8fafc 100%);
  --surface: rgba(255, 255, 255, 0.85);
  --surface-solid: #ffffff;
  --border: rgba(186, 230, 253, 0.6);
  --border-focus: #38bdf8;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(14, 165, 233, 0.1), 0 4px 6px -4px rgba(14, 165, 233, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(14, 165, 233, 0.15), 0 8px 10px -6px rgba(14, 165, 233, 0.1);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base resets & Tailwing canvas */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  color: var(--text-main);
  background-color: #f0f9ff;
}

body {
  position: relative;
  min-height: 100vh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Background Cloud Image Overlay */
.bg-cloud-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: url('../assets/feiji_bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}

/* Canvas overlay for Airplane Tailwing cursor effect */
#tailwing-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* Layout container */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
  object-fit: cover;
  transition: var(--transition);
}

.brand-logo img:hover {
  transform: scale(1.1) rotate(5deg);
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.98rem;
  transition: var(--transition);
}

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

.nav-buttons {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Special Button: 机场推荐 */
.btn-recommend {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.65rem 1.25rem;
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  color: #0369a1;
  border: 1px solid #7dd3fc;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 2px 6px rgba(56, 189, 248, 0.2);
}

.btn-recommend:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #bae6fd 0%, #7dd3fc 100%);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.35);
  color: #0284c7;
}

/* Primary CTA Button: 注册链接 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.7rem 1.5rem;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.5);
  background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
}

/* Hero & Main Grid Layout with Left & Right Sidebars */
.hero-section {
  padding: 3.5rem 0 2rem 0;
}

.hero-main-layout {
  display: grid;
  grid-template-columns: 260px 1fr 260px;
  gap: 1.5rem;
  align-items: start;
}

/* Sidebars (VPN features & Status Widgets) */
.sidebar-panel {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-hover);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 0.5rem;
}

/* Ping Live Monitor */
.node-ping-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
}

.node-ping-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: #f8fafc;
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  font-size: 0.85rem;
}

.ping-tag {
  font-weight: 700;
  font-family: monospace;
  color: #16a34a;
  background: #dcfce7;
  padding: 2px 6px;
  border-radius: 4px;
}

.client-down-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.client-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0.5rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.client-chip:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--accent);
}

/* Center Hero Banner */
.hero-center {
  background: var(--surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.4rem 1rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.88rem;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  color: #0f172a;
  margin-bottom: 1rem;
  letter-spacing: -0.8px;
}

.hero-title span {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 1.5rem auto;
}

/* Clickable Hero Laptop Banner Image -> jichangreview.net */
.hero-review-banner-link {
  display: block;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 28px rgba(2, 132, 199, 0.2);
  transition: var(--transition);
  margin: 1.5rem 0;
  border: 2px solid #7dd3fc;
  text-decoration: none;
}

.hero-review-banner-link:hover {
  transform: scale(1.02);
  box-shadow: 0 18px 40px rgba(2, 132, 199, 0.35);
  border-color: #0284c7;
}

.hero-review-img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.banner-overlay-badge {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: rgba(2, 132, 199, 0.92);
  color: #ffffff;
  padding: 8px 18px;
  border-radius: 30px;
  font-weight: 800;
  font-size: 0.9rem;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  gap: 8px;
}

.banner-overlay-badge i {
  color: #7dd3fc;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Feature Highlights Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

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

/* PRICING SECTION - Single Horizontal Row (价格格式弄成一排) */
.pricing-section {
  padding: 3rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

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

/* Single Row Flex Container */
.pricing-row-container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 1.25rem;
  overflow-x: auto;
  padding: 1rem 0.5rem 2rem 0.5rem;
  scroll-snap-type: x mandatory;
}

.pricing-row-container::-webkit-scrollbar {
  height: 8px;
}

.pricing-row-container::-webkit-scrollbar-track {
  background: rgba(224, 242, 254, 0.5);
  border-radius: 10px;
}

.pricing-row-container::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 10px;
}

.pricing-card {
  flex: 1 0 270px;
  min-width: 260px;
  max-width: 320px;
  scroll-snap-align: start;
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: 0 12px 28px rgba(2, 132, 199, 0.25);
  background: rgba(255, 255, 255, 0.95);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 18px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.plan-price {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 1rem;
}

.plan-price span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features li i {
  color: #16a34a;
}

.btn-plan {
  width: 100%;
  text-align: center;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 700;
  transition: var(--transition);
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid #bae6fd;
}

.pricing-card.popular .btn-plan {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border: none;
}

.btn-plan:hover {
  background: var(--primary);
  color: #ffffff;
}

/* Articles Hub Section */
.articles-section {
  padding: 3rem 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.article-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.tag-badge {
  background: var(--primary-light);
  color: var(--primary-hover);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
}

.article-card h3 a:hover {
  color: var(--primary);
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-light);
  border-top: 1px solid rgba(226, 232, 240, 0.8);
  padding-top: 0.75rem;
}

/* Reviews & Testimonials Section */
.reviews-section {
  padding: 3rem 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.review-card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 0.5rem;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.user-info h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-info span {
  font-size: 0.78rem;
  color: var(--text-light);
}

/* FAQ Accordion Section */
.faq-section {
  padding: 3rem 0 4rem 0;
}

.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question i {
  transition: var(--transition);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding: 0 1.5rem 1.25rem 1.5rem;
}

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

/* FOOTER SECTION & PBN LINK PIPELINE (严格符合要求) */
footer {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 2rem 0;
  margin-top: 3rem;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.02);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.25rem;
}

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

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-light);
}

/* Mandatory PBN Dofollow Links Styling */
.pbn-footer-links {
  font-size: 0.82rem;
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(203, 213, 225, 0.6);
  width: 100%;
  max-width: 600px;
  margin-top: 0.5rem;
}

.pbn-footer-links a {
  color: #475569;
  text-decoration: none;
  transition: color 0.2s ease;
}

.pbn-footer-links a:hover {
  color: #0284c7;
  text-decoration: underline;
}

/* Responsive Rules for Mobile */
@media (max-width: 1024px) {
  .hero-main-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-panel {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 1.8rem;
  }
  .pricing-row-container {
    padding-left: 0;
    padding-right: 0;
  }
  .pricing-card {
    flex: 0 0 85%;
  }
}