/* ==========================================================================
   一元机场 (yiyuan-jichang) - 极简白绿科技风 Design System (White & Emerald)
   ========================================================================== */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Color Palette - White & Emerald Green Tech */
  --bg-main: #f4fbf7;
  --bg-card: rgba(255, 255, 255, 0.90);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  
  --primary-emerald: #10b981;
  --primary-dark-emerald: #059669;
  --primary-mint: #34d399;
  --accent-teal: #0d9488;
  
  --text-main: #064e3b;
  --text-dark: #0f172a;
  --text-muted: #374151;
  --text-light: #6b7280;
  
  --border-light: rgba(209, 250, 229, 0.9);
  --border-glow: rgba(16, 185, 129, 0.35);
  
  --gradient-emerald: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-btn: linear-gradient(135deg, #10b981 0%, #047857 100%);
  --gradient-badge: linear-gradient(135deg, #059669 0%, #34d399 100%);
  --gradient-text: linear-gradient(135deg, #047857 0%, #10b981 50%, #0d9488 100%);
  
  --shadow-sm: 0 4px 6px -1px rgba(16, 185, 129, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-md: 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, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Canvas & Geometric Glow */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
}

.cursor-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, rgba(52, 211, 153, 0.06) 50%, transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: -1;
  transition: transform 0.05s ease-out;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 251, 247, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-dark);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-emerald);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition-fast);
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background: var(--gradient-btn);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
  transition: var(--transition-normal);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(16, 185, 129, 0.5);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-dark-emerald);
  border: 1.5px solid var(--primary-emerald);
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
}

.btn-outline:hover {
  background: var(--primary-emerald);
  color: #fff;
  box-shadow: 0 6px 18px rgba(16, 185, 129, 0.25);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 90px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-pill);
  color: var(--primary-dark-emerald);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: #042f2e;
}

.hero p {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.stat-item h3 {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-dark-emerald);
}

.stat-item p {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

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

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
  color: #042f2e;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
}

/* Pricing Section - 完美还原图1并应用白绿配色 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
  margin-top: 20px;
}

.pricing-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 40px 32px 32px;
  border: 1.5px solid #e2e8f0;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(16, 185, 129, 0.15);
}

.pricing-card.featured {
  border: 2px solid #10b981;
  box-shadow: 0 12px 35px rgba(16, 185, 129, 0.22);
}

.featured-badge {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-badge);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 4px 20px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
}

.pricing-header {
  text-align: center;
  margin-bottom: 24px;
}

.pricing-title {
  font-size: 22px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 16px;
}

.pricing-price {
  font-size: 38px;
  font-weight: 900;
  color: #059669;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 12px;
}

.pricing-price .currency {
  font-size: 22px;
  font-weight: 700;
}

.pricing-price .period {
  font-size: 14px;
  color: #64748b;
  font-weight: 400;
}

.pricing-desc {
  font-size: 14px;
  color: #64748b;
  text-align: center;
  min-height: 42px;
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: #334155;
  margin-bottom: 14px;
}

.pricing-features svg {
  color: #10b981;
  flex-shrink: 0;
}

.pricing-btn {
  display: block;
  width: 100%;
  padding: 14px 0;
  text-align: center;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: var(--transition-normal);
  border: 1px solid #cbd5e1;
  color: #0f172a;
  background: #ffffff;
}

.pricing-btn:hover {
  border-color: #10b981;
  color: #059669;
  background: rgba(16, 185, 129, 0.05);
}

.pricing-card.featured .pricing-btn {
  background: var(--gradient-btn);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.pricing-card.featured .pricing-btn:hover {
  box-shadow: 0 8px 22px rgba(16, 185, 129, 0.5);
  transform: translateY(-2px);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: var(--transition-normal);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(16, 185, 129, 0.1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-dark-emerald);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #042f2e;
}

.feature-card p {
  font-size: 15px;
  color: var(--text-muted);
}

/* User Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

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

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}

.review-user h4 {
  font-size: 16px;
  font-weight: 700;
}

.review-user p {
  font-size: 13px;
  color: var(--text-light);
}

.stars {
  color: #f59e0b;
  margin-bottom: 12px;
}

/* FAQ Accordion */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
  cursor: pointer;
  text-align: left;
}

.faq-icon {
  transition: transform 0.3s ease;
  color: var(--primary-emerald);
}

.faq-item.active .faq-icon {
  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: 15px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 24px 24px;
}

/* Articles Hub & Cards */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

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

.article-tag {
  align-self: flex-start;
  padding: 4px 12px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--primary-dark-emerald);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

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

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

.article-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-light);
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

/* Content Page / SEO Articles Layout */
.content-wrapper {
  padding: 60px 0;
  max-width: 900px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--primary-dark-emerald);
  text-decoration: none;
}

.article-content {
  background: #ffffff;
  padding: 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.article-content h1 {
  font-size: 34px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #042f2e;
}

.article-info {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 800;
  margin: 36px 0 16px;
  color: #042f2e;
}

.article-content h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 24px 0 12px;
  color: #042f2e;
}

.article-content p {
  font-size: 16px;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
  color: #334155;
  font-size: 16px;
  line-height: 1.8;
}

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

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}

.article-table th, .article-table td {
  padding: 14px 18px;
  border: 1px solid var(--border-light);
  text-align: left;
}

.article-table th {
  background: rgba(16, 185, 129, 0.08);
  font-weight: 700;
  color: var(--primary-dark-emerald);
}

.cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(52, 211, 153, 0.12) 100%);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}

.cta-box h3 {
  font-size: 22px;
  margin-bottom: 12px;
  color: #042f2e;
}

.cta-box p {
  margin-bottom: 20px;
}

/* Footer */
footer {
  background: #064e3b;
  color: #a7f3d0;
  padding: 70px 0 30px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 14px;
  max-width: 320px;
  color: #a7f3d0;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  color: #a7f3d0;
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition-fast);
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid #047857;
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero h1 { font-size: 42px; }
  .features-grid, .pricing-grid, .reviews-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 32px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .features-grid, .pricing-grid, .reviews-grid, .article-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .article-content { padding: 24px; }
}