/* 冲上云霄机场官网 (chongshangyunxiao.xyz) 典雅蓝调风格 */
:root {
  --primary-blue: #2b4c8c;
  --primary-blue-hover: #1e3a70;
  --accent-cyan: #0284c7;
  --bg-hero: linear-gradient(135deg, #2b4b88 0%, #36599b 100%);
  --bg-light: #f8fafc;
  --bg-card: #ffffff;
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --text-light: #ffffff;
  --border-light: #e2e8f0;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #ffffff;
  color: var(--text-dark);
}

body {
  line-height: 1.6;
  background: #ffffff;
  min-height: 100vh;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header Navbar - Pure White Background */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
  box-shadow: var(--shadow-sm);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--primary-blue);
  letter-spacing: -0.5px;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: #475569;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 700;
  border-radius: 6px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-pill-blue {
  background: #3b82f6;
  color: #ffffff !important;
  border-radius: 6px;
  padding: 8px 22px;
}

.btn-pill-blue:hover {
  background: #2563eb;
}

.btn-outline-white {
  background: transparent;
  color: #ffffff !important;
  border: 1.5px solid #ffffff;
  padding: 12px 28px;
  font-size: 16px;
  border-radius: 6px;
  transition: all 0.25s ease;
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

.btn-fill-cyan {
  background: #0284c7;
  color: #ffffff !important;
  padding: 12px 28px;
  font-size: 16px;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.btn-fill-cyan:hover {
  background: #0369a1;
  transform: translateY(-1px);
}

.btn-card-buy {
  background: var(--primary-blue);
  color: #ffffff !important;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 6px;
  width: 100%;
}

.btn-card-buy:hover {
  background: var(--primary-blue-hover);
}

/* Hero Section */
.hero {
  background: var(--bg-hero);
  color: #ffffff;
  padding: 70px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-text-col {
  flex: 1.1;
  max-width: 620px;
}

.hero-title-main {
  font-size: 42px;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.hero-title-sub {
  font-size: 32px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  opacity: 0.95;
}

.hero-slogan {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 32px;
  font-weight: 500;
}

.hero-cta-box {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

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

/* Right Column - Isometric SVG Graphic */
.hero-graphic-col {
  flex: 0.9;
  display: flex;
  justify-content: center;
  align-items: center;
}

.isometric-graphic-wrapper {
  width: 100%;
  max-width: 480px;
  filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.25));
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* Features Grid */
.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(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #eff6ff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  color: var(--primary-blue);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Pricing Grid */
.bg-light-section {
  background-color: var(--bg-light);
}

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

.price-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.price-card:hover {
  box-shadow: var(--shadow-md);
}

.price-card.popular {
  border: 2px solid var(--primary-blue);
  box-shadow: 0 12px 30px rgba(43, 76, 140, 0.15);
}

.badge-pop {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--primary-blue);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 999px;
}

.card-plan-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.card-plan-price {
  font-size: 36px;
  font-weight: 900;
  color: var(--primary-blue);
  margin-bottom: 20px;
}

.card-plan-price span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.card-plan-feats {
  list-style: none;
  margin-bottom: 32px;
  flex: 1;
}

.card-plan-feats li {
  font-size: 14px;
  color: #334155;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-plan-feats li::before {
  content: "✓";
  color: #10b981;
  font-weight: bold;
}

/* Node Status Monitor Strip */
.node-status-bar {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-top: -30px;
  margin-bottom: 60px;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: #334155;
}

.status-dot {
  width: 10px;
  height: 10px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

/* Articles Layout */
.articles-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.featured-article-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.featured-article-card h3 {
  font-size: 22px;
  color: var(--text-dark);
  margin: 16px 0;
  line-height: 1.4;
}

.featured-article-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 24px;
}

.article-tag {
  display: inline-block;
  background: #e0f2fe;
  color: #0284c7;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
}

.article-list-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-mini-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: all 0.2s ease;
}

.article-mini-item:hover {
  border-color: var(--primary-blue);
  transform: translateX(4px);
}

.article-mini-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
}

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

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #f59e0b;
  font-size: 18px;
  margin-bottom: 12px;
}

.review-text {
  color: #475569;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.avatar {
  width: 40px;
  height: 40px;
  background: var(--primary-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #ffffff;
}

.user-info h4 {
  font-size: 14px;
  color: var(--text-dark);
}

.user-info span {
  font-size: 12px;
  color: var(--text-muted);
}

/* FAQ Grid */
.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.faq-question {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.faq-answer {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

/* Article Detail Page Specifics */
.article-page {
  padding: 60px 0;
}

.article-header {
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 20px;
}

.article-title-main {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-dark);
  margin: 12px 0;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-muted);
  font-size: 13px;
}

.article-content {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 40px;
  font-size: 15px;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.article-content h2 {
  font-size: 22px;
  color: var(--text-dark);
  margin: 28px 0 14px 0;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-light);
}

.article-content h3 {
  font-size: 18px;
  color: var(--primary-blue);
  margin: 20px 0 10px 0;
}

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

.article-content blockquote {
  background: #f1f5f9;
  border-left: 4px solid var(--primary-blue);
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-dark);
}

.article-nav-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 40px;
}

.article-nav-link {
  color: var(--primary-blue);
  font-weight: 600;
  font-size: 14px;
}

.article-nav-link:hover {
  text-decoration: underline;
}

/* Footer & PBN Links */
footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 48px 0 32px;
  text-align: center;
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
}

.footer-desc {
  font-size: 14px;
  color: #94a3b8;
  max-width: 600px;
}

.footer-pbn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 13px;
  color: #94a3b8;
  margin-top: 12px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 999px;
}

.footer-pbn a {
  color: #cbd5e1;
  transition: color 0.2s ease;
}

.footer-pbn a:hover {
  color: #38bdf8;
}

.copyright {
  font-size: 13px;
  color: #64748b;
  margin-top: 8px;
}

@media (max-width: 900px) {
  .hero-grid {
    flex-direction: column;
    text-align: center;
  }
  .hero-title-main {
    font-size: 32px;
  }
  .hero-title-sub {
    font-size: 24px;
  }
  .hero-cta-box {
    align-items: center;
  }
  .articles-layout {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
}