/* ==========================================================================
   呆鹅云机场 (SillyGoose Cloud Airport) - Ice Blue Aerodynamic System
   Design & Layout System
   ========================================================================== */

:root {
  /* Color Palette: Ice Blue (#E0F2FE / #F0F9FF) & Oceanic Slate */
  --bg-polar: #F0F9FF;
  --bg-ice-subtle: #E0F2FE;
  --bg-card: #FFFFFF;
  --bg-card-alt: #F8FAFC;
  
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  
  --accent-cyan: #0284C7;
  --accent-cyan-light: #38BDF8;
  --accent-ice-glow: rgba(56, 189, 248, 0.2);
  --accent-blue-dark: #0369A1;
  --accent-ice-border: #BAE6FD;
  
  --border-color: #E2E8F0;
  --border-focus: #0284C7;
  
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 6px 18px rgba(14, 165, 233, 0.08);
  --shadow-lg: 0 16px 36px rgba(2, 132, 199, 0.12);
  --shadow-glow: 0 0 24px rgba(56, 189, 248, 0.35);
  
  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-polar);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 90% 90%, rgba(2, 132, 199, 0.06) 0%, transparent 45%);
}

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

a:hover {
  color: var(--accent-blue-dark);
}

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

ul, ol {
  list-style: none;
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(240, 249, 255, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--accent-ice-border);
  padding: 16px 0;
  transition: var(--transition);
}

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

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-cyan-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  line-height: 1.1;
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(90deg, #0F172A, #0284C7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-subtitle {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

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

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue-dark));
  color: #FFF !important;
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.25);
  cursor: pointer;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}

.cta-btn-secondary {
  background: #FFFFFF;
  color: var(--text-primary) !important;
  border: 1px solid var(--accent-ice-border);
  box-shadow: var(--shadow-sm);
}

.cta-btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan) !important;
  transform: translateY(-2px);
}

.cta-btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* Hero Section */
.hero {
  padding: 60px 0 40px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 36px;
  align-items: center;
}

.telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-weight: 600;
  margin-bottom: 20px;
}

.telemetry-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan-light);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan-light);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 2.7rem;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-title span {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-cyan-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

/* Aerodynamic V-Formation Interactive Board */
.v-board {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.v-board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 20px;
}

.v-board-title {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.v-board-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: #10B981;
  font-weight: 600;
}

.v-nodes-wrapper {
  position: relative;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(56, 189, 248, 0.08) 0%, transparent 70%);
  border-radius: var(--radius-md);
  border: 1px dashed rgba(186, 230, 253, 0.8);
}

.v-node {
  position: absolute;
  background: var(--bg-card);
  border: 1.5px solid var(--accent-cyan-light);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

.v-node:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-cyan);
}

.v-node-lead {
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  border: 2px solid var(--accent-cyan);
  background: linear-gradient(135deg, #FFFFFF, #E0F2FE);
}

.v-node-w1 { top: 85px; left: 18%; }
.v-node-w2 { top: 85px; right: 18%; }
.v-node-w3 { top: 170px; left: 5%; }
.v-node-w4 { top: 170px; right: 5%; }

.v-metrics-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
  text-align: center;
}

.v-metric-item {
  background: var(--bg-polar);
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-ice-border);
}

.v-metric-val {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.v-metric-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Side-by-Side Split Sections (左右结构) */
.section {
  padding: 70px 0;
}

.section-alt {
  background-color: rgba(224, 242, 254, 0.4);
  border-top: 1px solid var(--accent-ice-border);
  border-bottom: 1px solid var(--accent-ice-border);
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.split-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.split-image-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--accent-ice-border);
  background: #FFFFFF;
}

.split-image-wrap img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: var(--transition);
}

.split-image-wrap:hover img {
  transform: scale(1.02);
}

.section-title-wrap {
  margin-bottom: 24px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text-primary);
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Feature Cards Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-md);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.feature-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.feature-h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.price-card-popular {
  border: 2px solid var(--accent-cyan);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(180deg, #FFFFFF 0%, #F0F9FF 100%);
}

.price-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue-dark));
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.price-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.price-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 24px;
}

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

.price-list {
  margin-bottom: 32px;
  flex: 1;
}

.price-list li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.price-list li .check-icon {
  width: 18px;
  height: 18px;
  background: rgba(2, 132, 199, 0.1);
  color: var(--accent-cyan);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 900;
  flex-shrink: 0;
}

/* Audience Grid */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 24px;
}

.audience-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.audience-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  background: rgba(2, 132, 199, 0.08);
  color: var(--accent-cyan);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Article Cards Grid & Layout */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.card-item {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 8px;
  text-transform: uppercase;
}

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

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

.card-link {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

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

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--accent-cyan);
  transition: var(--transition);
}

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

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

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

/* Testimonial Grid */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-ice-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

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

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-cyan-light));
  color: #FFF;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-user {
  font-weight: 700;
  font-size: 0.95rem;
}

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

.review-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Article Detail Page Layout */
.article-container {
  max-width: 900px;
  margin: 40px auto 80px;
  padding: 0 20px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-h1 {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-ice-border);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 14px;
}

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

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

.article-body ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

.callout-box {
  background: rgba(2, 132, 199, 0.06);
  border-left: 4px solid var(--accent-cyan);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  margin: 28px 0;
}

.callout-title {
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.article-banner-cta {
  background: linear-gradient(135deg, #0F172A, #0284C7);
  color: #FFF;
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 48px 0;
  box-shadow: var(--shadow-lg);
}

.article-banner-cta h3 {
  font-size: 1.8rem;
  color: #FFF;
  margin-bottom: 12px;
}

.article-banner-cta p {
  color: #E2E8F0;
  margin-bottom: 24px;
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: #94A3B8;
  padding: 60px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-h4 {
  color: #FFF;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #94A3B8;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #FFF;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

/* Responsive Layout */
@media (max-width: 992px) {
  .hero-grid, .split-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 1.8rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}