/* ==========================================================================
   妙妙云机场 (Miaomiao Cloud Airport) - 官方视觉设计系统
   Theme: Alpine Emerald & Crisp Light (白绿浅色系 / 大气简约 / 高端质感)
   ========================================================================== */

:root {
  /* Color Palette - White & Emerald Light Theme */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F0FDF4;
  --bg-card: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.85);

  --primary-50: #ECFDF5;
  --primary-100: #D1FAE5;
  --primary-200: #A7F3D0;
  --primary-300: #6EE7B7;
  --primary-400: #34D399;
  --primary-500: #10B981; /* Main Brand Green */
  --primary-600: #059669; /* Hover / Accent Dark Green */
  --primary-700: #047857;
  --primary-800: #065F46;
  --primary-900: #064E3B;

  --text-main: #0F172A;
  --text-muted: #475569;
  --text-light: #64748B;
  --text-white: #FFFFFF;

  --border-color: #E2E8F0;
  --border-light: #F1F5F9;
  --border-green: #A7F3D0;

  --shadow-sm: 0 1px 2px 0 rgba(16, 185, 129, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(16, 185, 129, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px -5px rgba(16, 185, 129, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.25);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --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;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-primary);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #ECFDF5 0%, #FFFFFF 60%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* Dynamic Background Canvas */
#bgCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* Typography Utilities */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--primary-50);
  border: 1px solid var(--border-green);
  color: var(--primary-700);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title span {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

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

/* Header Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: var(--shadow-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-600);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-500);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
  color: var(--text-white);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 100%);
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--primary-700);
  border: 1px solid var(--border-green);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--primary-50);
  border-color: var(--primary-400);
  transform: translateY(-2px);
}

.btn-pulse {
  position: relative;
  overflow: hidden;
}

.btn-pulse::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
  transform: translate(-50%, -50%) scale(0);
  transition: transform 0.5s ease-out;
}

.btn-pulse:hover::before {
  transform: translate(-50%, -50%) scale(1);
}

/* Hero Section */
.hero {
  padding: 160px 0 90px;
  text-align: center;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--primary-200);
  color: var(--primary-700);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: pulseBadge 2.5s infinite alternate;
}

@keyframes pulseBadge {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.2); }
  100% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 24px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 48px;
}

.hero-features-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.strip-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

.strip-item svg {
  color: var(--primary-500);
}

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

.status-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}

.status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 16px;
}

.status-summary {
  display: flex;
  align-items: center;
  gap: 24px;
}

.summary-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.dot-green {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary-500);
  box-shadow: 0 0 8px var(--primary-500);
  animation: blinkDot 1.5s infinite;
}

@keyframes blinkDot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}

.node-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-item:hover {
  border-color: var(--primary-300);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--bg-primary);
}

.node-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-name {
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.flag-icon {
  font-size: 1.2rem;
}

.protocol-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--primary-100);
  color: var(--primary-800);
}

.node-metrics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.latency-val {
  font-weight: 700;
  color: var(--primary-600);
}

.loss-val {
  color: var(--text-light);
  font-size: 0.8rem;
}

.status-bar-bg {
  height: 6px;
  width: 100%;
  background: #E2E8F0;
  border-radius: 3px;
  overflow: hidden;
}

.status-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-400), var(--primary-600));
  border-radius: 3px;
  transition: width 0.8s ease-in-out;
}

/* Features / Advantages Section */
.features-section {
  padding: 90px 0;
  background: radial-gradient(ellipse at bottom, var(--primary-50) 0%, transparent 70%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
  margin-top: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-300);
}

.feature-icon-box {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
  color: var(--primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* Pricing Section */
.pricing-section {
  padding: 90px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 50px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--primary-500);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: scale(1.03);
}

.featured-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  color: white;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

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

.pricing-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary-600);
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

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

.pricing-features {
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-features svg {
  color: var(--primary-500);
  flex-shrink: 0;
}

/* Testimonials / Reviews */
.reviews-section {
  padding: 90px 0;
  background: var(--bg-secondary);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

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

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-100);
  color: var(--primary-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.user-meta h4 {
  font-size: 1rem;
  font-weight: 700;
}

.user-meta span {
  font-size: 0.85rem;
  color: var(--text-light);
}

.review-rating {
  color: #F59E0B;
  margin-bottom: 12px;
  display: flex;
  gap: 4px;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* FAQ Section */
.faq-section {
  padding: 90px 0;
}

.faq-container {
  max-width: 800px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: var(--primary-400);
  box-shadow: var(--shadow-sm);
}

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

.faq-question svg {
  transition: transform 0.3s ease;
  color: var(--primary-600);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* Articles & Knowledge Base Section */
.articles-section {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
  margin-top: 48px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-300);
}

.article-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--primary-50);
  color: var(--primary-700);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--primary-100);
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
  transition: var(--transition);
}

.article-card:hover .article-title {
  color: var(--primary-600);
}

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

.article-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-600);
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-link svg {
  transition: transform 0.2s ease;
}

.article-card:hover .article-link svg {
  transform: translateX(4px);
}

/* Article Detail Page Layout (For Knowledge Base) */
.article-page {
  padding: 140px 0 80px;
}

.article-header {
  max-width: 860px;
  margin: 0 auto 40px;
  text-align: center;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 16px;
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-md);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-main);
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 36px 0 16px;
  color: var(--text-main);
  border-left: 4px solid var(--primary-500);
  padding-left: 14px;
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--text-main);
}

.article-content p {
  margin-bottom: 20px;
  color: var(--text-muted);
}

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--text-muted);
}

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

.article-cta-box {
  background: linear-gradient(135deg, var(--primary-50), #FFFFFF);
  border: 1.5px solid var(--border-green);
  border-radius: var(--radius-md);
  padding: 32px;
  margin: 40px 0 20px;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  color: var(--primary-800);
  margin-bottom: 10px;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Footer */
.footer {
  background: #091E16;
  color: #94A3B8;
  padding: 70px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 16px;
}

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

.footer-title {
  color: white;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 18px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-400);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

/* Floating Random Jump Bar for Mobile / Sticky CTA */
.sticky-cta-bar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-green);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Responsive Rules */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.75rem;
  }
  .nav-links {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .hero-btns {
    flex-direction: column;
    width: 100%;
  }
  .hero-btns .btn {
    width: 100%;
  }
  .pricing-card.featured {
    transform: none;
  }
}