/* Modern, card-based, and gradient style inspired by aboutus.html and index.html */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #4a90e2 100%);
  min-height: 100vh;
  margin: 0;
  padding: 0;
}

header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 2rem 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
  text-align: center;
  border-radius: 0 0 20px 20px;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #1e3c72, #4a90e2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  color: #666;
  font-weight: 300;
}

nav {
  background: rgba(255, 255, 255, 0.95);
  padding: 1rem 0;
  border-radius: 20px;
  margin: 2rem auto 0 auto;
  max-width: 900px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
  text-align: center;
}
nav a {
  color: #1e3c72;
  margin: 0 15px;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
  display: inline-block;
}
nav a:hover {
  background: #1e3c72;
  color: #fff;
}

main {
  max-width: 900px;
  margin: 30px auto;
  background: rgba(255,255,255,0.95);
  padding: 2.5rem 2rem;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

h1, h2 {
  color: #2c3e50;
}

h2 {
  font-size: 2.2rem;
  margin-bottom: 1.2rem;
  text-align: center;
}

h3 {
  color: #1e3c72;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

section {
  margin-bottom: 2.5rem;
}

pre, code {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1rem;
  font-size: 1rem;
  color: #003366;
  overflow-x: auto;
  display: block;
}

ul, ol {
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.card, .example-card {
  background: linear-gradient(135deg, #1e3c72, #4a90e2);
  color: white;
  padding: 1.5rem;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.08);
  margin-bottom: 2rem;
}

.example-card code {
  background: #fff;
  color: #1e3c72;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }
  main {
    padding: 1.2rem 0.5rem;
  }
  nav {
    font-size: 0.95rem;
    padding: 0.7rem 0;
  }
  h2 {
    font-size: 1.5rem;
  }
}