:root {
  --primary-color: #003366;
  --secondary-color: #660099;
  --accent-color: #00ff99;
  --bg-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --font-primary: 'Roboto', sans-serif;
  --font-secondary: 'Open Sans', sans-serif;
}

body {
  margin: 0;
  font-family: var(--font-primary);
  background: var(--bg-gradient);
  color: #fff;
  line-height: 1.6;
  padding: 20px;
  overflow-x: hidden;
}

header {
  text-align: center;
  padding: 40px 20px;
  background: rgba(0, 0, 0, 0.7);
  position: relative;
}

header h1 {
  font-size: 2.5rem;
  font-family: var(--font-secondary);
  margin: 0;
  background: linear-gradient(90deg, #00ff99, #660099);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

section {
  margin-bottom: 40px;
  padding: 20px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

h2, h3 {
  color: var(--accent-color);
  font-family: var(--font-secondary);
}

p {
  font-size: 1rem;
  margin: 10px 0;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: rgba(255, 255, 255, 0.1);
  margin: 5px 0;
  padding: 10px;
  border-radius: 5px;
}

code {
  display: block;
  background: #333;
  color: #00ff99;
  padding: 15px;
  border-radius: 5px;
  font-family: 'Courier New', Courier, monospace;
  overflow-x: auto;
}

button {
  background: var(--primary-color);
  color: #fff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  transition: background 0.3s ease;
  border-radius: 5px;
}

button:hover {
  background: var(--secondary-color);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 10px 0;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }
  section {
    padding: 15px;
  }
  code {
    font-size: 0.9rem;
  }
}

footer {
  text-align: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.5);
  margin-top: 40px;
}