/* ==========================================================================
   xxyun 机场 - 自然现代设计系统 (去AI化/干净高品质)
   ========================================================================== */

:root {
  --bg-dark: #090c15;
  --bg-card: rgba(255, 255, 255, 0.035);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --border-light: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(0, 210, 255, 0.35);
  
  --primary-cyan: #00d2ff;
  --primary-blue: #0066ff;
  --primary-purple: #6c5ce7;
  --accent-green: #10b981;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  
  --shadow-glow: 0 10px 30px rgba(0, 210, 255, 0.15);
  --glass-blur: blur(16px);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Background Canvas */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* Layout Container */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Nav */
.header-nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
  max-width: 1180px;
  z-index: 1000;
  background: rgba(13, 18, 30, 0.75);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 12px 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  transition: var(--transition-normal);
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 210, 255, 0.3);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.92rem;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-normal);
  box-shadow: 0 4px 18px rgba(0, 210, 255, 0.3);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 210, 255, 0.5);
}

.btn-cta-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  font-weight: 600;
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary-cyan);
  color: #fff;
}

/* Hero Section */
.hero-section {
  padding-top: 140px;
  padding-bottom: 80px;
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.slogan-top-bar {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid rgba(0, 210, 255, 0.2);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-cyan);
  margin-bottom: 20px;
}

.slogan-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.freeform-hero-wrapper {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-main-heading {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-gradient-text {
  background: linear-gradient(135deg, #ffffff 40%, var(--primary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.staggered-tag-line {
  font-size: 2.2rem;
  font-weight: 800;
  color: #e2e8f0;
}

.hero-description {
  font-size: 1.08rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 580px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: flex;
  gap: 36px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.stat-item h4 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--primary-cyan);
}

.stat-item p {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Hero Right Visual Space Frame */
.hero-visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(16px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
  transition: var(--transition-normal);
}

.hero-visual-card:hover {
  border-color: var(--primary-cyan);
}

.architectural-img-wrapper {
  position: relative;
  width: 100%;
  height: 440px;
  background: radial-gradient(circle at 50% 40%, #1e293b 0%, #090d16 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.space-window-arch {
  position: absolute;
  width: 82%;
  height: 72%;
  border: 6px solid rgba(240, 244, 248, 0.8);
  border-radius: 100px 100px 16px 16px;
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.15), inset 0 0 25px rgba(0, 210, 255, 0.25);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #020617;
}

.earth-sphere {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #38bdf8 0%, #1e40af 50%, #030712 90%);
  box-shadow: 0 0 50px rgba(56, 189, 248, 0.5);
  animation: earthSpin 45s linear infinite;
}

@keyframes earthSpin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.glass-floating-badge {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: rgba(13, 18, 30, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pulse-ring {
  width: 10px;
  height: 10px;
  background: var(--accent-green);
  border-radius: 50%;
}

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

.section-tag {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary-cyan);
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

/* Section 3: Node Latency */
.status-section {
  padding: 80px 0;
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px;
  backdrop-filter: blur(10px);
  transition: var(--transition-normal);
}

.node-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-cyan);
  transform: translateY(-3px);
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.node-flag-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.flag-icon {
  font-size: 1.4rem;
}

.node-name {
  font-weight: 700;
  font-size: 1.02rem;
}

.node-type-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(0, 210, 255, 0.12);
  color: var(--primary-cyan);
  border: 1px solid rgba(0, 210, 255, 0.25);
}

.node-metrics {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px dashed var(--border-light);
}

.metric-ping {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-green);
}

.metric-status {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.ping-bar-wrapper {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  margin-top: 10px;
  overflow: hidden;
}

.ping-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--primary-cyan));
  border-radius: 2px;
}

/* Section 4: Pricing & Advantages */
.pricing-advantages-section {
  padding: 80px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 80px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 210, 255, 0.4);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(0, 102, 255, 0.12) 0%, rgba(13, 18, 30, 0.8) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: var(--shadow-glow);
}

.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--primary-cyan), var(--primary-blue));
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 14px;
  border-radius: 20px;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 6px;
}

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

.plan-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
}

.plan-price span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-features-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features-list li::before {
  content: '✓';
  color: var(--primary-cyan);
  font-weight: 800;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  backdrop-filter: blur(10px);
  transition: var(--transition-normal);
}

.advantage-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-cyan);
}

.advantage-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(0, 210, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary-cyan);
  margin-bottom: 16px;
}

.advantage-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.advantage-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Section 5: FAQ & Knowledge Base */
.faq-knowledge-section {
  padding: 80px 0;
}

.faq-container {
  max-width: 820px;
  margin: 0 auto 70px auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.02rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon-toggle {
  font-size: 1rem;
  color: var(--primary-cyan);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: rgba(0, 0, 0, 0.15);
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px 24px;
  max-height: 250px;
}

.faq-answer p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
  transition: var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-cyan);
  transform: translateY(-3px);
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-cyan);
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
  color: #fff;
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

.read-more-link {
  color: var(--primary-cyan);
  font-weight: 600;
}

/* Section 6: Reviews */
.reviews-section {
  padding: 80px 0;
}

.reviews-staggered-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px;
  backdrop-filter: blur(10px);
}

.review-rating {
  color: #f59e0b;
  font-size: 1rem;
  margin-bottom: 12px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.author-name {
  font-weight: 700;
  font-size: 0.92rem;
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* Footer */
.footer {
  padding: 50px 0 26px 0;
  border-top: 1px solid var(--border-light);
  background: rgba(5, 8, 15, 0.95);
  margin-top: 60px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

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

.footer-disclaimer {
  max-width: 600px;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* Article Template Internal Page Styles */
.article-page-body {
  padding-top: 130px;
  padding-bottom: 80px;
}

.article-header {
  margin-bottom: 36px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta-header {
  display: flex;
  gap: 18px;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 24px;
}

.article-body-content {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  backdrop-filter: blur(10px);
  line-height: 1.8;
  color: #cbd5e1;
}

.article-body-content h2 {
  font-size: 1.55rem;
  color: #fff;
  margin: 28px 0 14px 0;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-light);
}

.article-body-content h3 {
  font-size: 1.2rem;
  color: var(--primary-cyan);
  margin: 20px 0 10px 0;
}

.article-body-content p {
  margin-bottom: 18px;
}

.article-body-content ul, .article-body-content ol {
  margin-bottom: 18px;
  padding-left: 22px;
}

.article-body-content li {
  margin-bottom: 6px;
}

.article-cta-box {
  margin-top: 36px;
  padding: 28px;
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.08), rgba(0, 102, 255, 0.12));
  border: 1px solid var(--primary-cyan);
  border-radius: var(--radius-md);
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  margin-bottom: 10px;
  color: #fff;
}

@media (max-width: 992px) {
  .freeform-hero-wrapper {
    grid-template-columns: 1fr;
  }
  .hero-main-heading {
    font-size: 2.5rem;
  }
  .nav-links {
    display: none;
  }
}

@media (max-width: 640px) {
  .header-nav {
    width: calc(100% - 24px);
    padding: 10px 16px;
  }
  .hero-main-heading {
    font-size: 2rem;
  }
  .pricing-grid, .advantages-grid, .knowledge-grid, .nodes-grid {
    grid-template-columns: 1fr;
  }
}