:root {
  --primary-color: #1e3a8a;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary-color: #06b6d4;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #ffffff;
  --bg-light: #f9fafb;
  --bg-dark: #111827;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-tech: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #06b6d4 100%);
}

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

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--bg-color);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.navbar-brand .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  background: var(--gradient-tech);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.navbar-item {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
  position: relative;
}

.navbar-item:hover {
  color: var(--primary-color);
}

.navbar-item::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-tech);
  transition: width 0.3s;
}

.navbar-item:hover::after {
  width: 100%;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.navbar-toggle span {
  width: 25px;
  height: 3px;
  background: var(--primary-color);
  transition: all 0.3s;
}

.language-switcher {
  margin-left: 1rem;
}

.lang-link {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  transition: all 0.3s;
}

.lang-link:hover {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

/* Main Content */
.main-content {
  min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
  background: var(--gradient-tech);
  color: white;
  padding: 6rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: white;
  color: var(--primary-color);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background: white;
  color: var(--primary-color);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

/* Features Grid */
.features-grid {
  padding: 5rem 0;
  background: var(--bg-light);
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--primary-color);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  text-align: center;
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.8;
}

/* Page Content */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 20px;
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border-color);
}

.page-title {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.page-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
}

.page-body {
  line-height: 1.8;
}

.page-body h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.page-body h3 {
  font-size: 1.5rem;
  color: var(--primary-dark);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.page-body p {
  margin-bottom: 1rem;
  color: var(--text-color);
}

.page-body ul, .page-body ol {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.page-body li {
  margin-bottom: 0.5rem;
}

.page-body a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.page-body a:hover {
  border-bottom-color: var(--primary-color);
}

.page-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin: 2rem 0;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.page-body img[alt*="小程序"] {
  max-width: 300px;
  background: white;
  padding: 1rem;
  border: 2px solid var(--border-color);
}

.page-body img[alt*="QR Code"] {
  max-width: 300px;
  background: white;
  padding: 1rem;
  border: 2px solid var(--border-color);
}

/* Vision Section */
.vision-section {
  padding: 5rem 0;
  background: var(--bg-light);
}

.vision-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.vision-content h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 2rem;
}

.vision-statement {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 2rem;
  line-height: 1.4;
  background: var(--gradient-tech);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.vision-details {
  text-align: left;
  max-width: 800px;
  margin: 0 auto 2rem;
}

.vision-details p {
  font-size: 1.125rem;
  color: var(--text-color);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

/* About Preview */
.about-preview {
  padding: 5rem 0;
  background: white;
}

.about-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.about-content h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

.about-content p {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  line-height: 1.8;
}

/* Footer */
.site-footer {
  background: var(--bg-dark);
  color: white;
  padding: 3rem 0 1rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: 1rem;
  color: white;
}

.footer-section p {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
  margin: 0;
  line-height: 1.6;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-bottom a:hover {
  color: white;
}

/* Responsive */
@media (max-width: 768px) {
  .navbar-toggle {
    display: flex;
  }
  
  .navbar-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .page-title {
    font-size: 2rem;
  }
}