:root {
  --primary: #002B5B;
  --secondary: #B0B0B0;
  --accent: #FFA500;
  --highlight: #ADD8E6;
  --bg: #F5F5F5;
  --text: #333333;
  --white: #FFFFFF;
}

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

body {
  font-family: 'Roboto', 'Open Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}

header {
  background: linear-gradient(135deg, var(--primary), var(--highlight));
  padding: 2rem;
  text-align: center;
  color: var(--white);
  margin-bottom: 3rem;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

h1, h2, h3, h4 {
  font-weight: 700;
  margin: 1.5rem 0;
  color: var(--primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin: 1rem 0;
  font-size: 1.1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.card {
  background: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.img-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 2rem 0;
}

.img-container img {
  width: 320px;
  height: 320px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.img-container img:hover {
  transform: scale(1.03);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 2rem 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

code {
  font-family: 'Courier New', monospace;
}

.note {
  background: rgba(0, 43, 91, 0.05);
  border-left: 4px solid var(--primary);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 0 8px 8px 0;
}

.footer {
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
  background: linear-gradient(135deg, var(--primary), var(--highlight));
  color: var(--white);
}

.parallax {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  text-align: center;
  margin: 3rem 0;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 1rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(255, 165, 0, 0.3);
}

.button:hover {
  background: #e69500;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 165, 0, 0.4);
}

.nav {
  position: sticky;
  top: 0;
  background: rgba(0, 43, 91, 0.95);
  padding: 1rem 2rem;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.nav a:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
  
  .nav {
    flex-direction: column;
    padding: 1rem;
  }
  
  .nav-links {
    margin-top: 1rem;
    gap: 1rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
}