:root {
  --primary-color: #0A2463;
  --accent-color-1: #FF9800;
  --accent-color-2: #B2FF59;
  --secondary-color: #1E1E1E;
  --text-color: #FFFFFF;
  --code-bg: #2D2D2D;
  --code-text: #E0E0E0;
}

body {
  margin: 0;
  font-family: 'Helvetica', sans-serif;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color-1));
}

header h1 {
  font-size: 2rem;
  font-weight: bold;
  margin: 0;
}

nav {
  position: fixed;
  left: 0;
  top: 0;
  width: 200px;
  height: 100vh;
  background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
  padding: 20px;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
}

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

nav ul li {
  margin-bottom: 15px;
}

nav ul li a {
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.3s ease;
  rel: "nofollow";
}

nav ul li a:hover {
  color: var(--accent-color-1);
}

main {
  margin-left: 220px;
  padding: 20px;
}

h1, h2, h3 {
  font-family: 'Roboto', sans-serif;
  font-weight: bold;
  color: var(--accent-color-1);
}

p {
  font-size: 1rem;
  margin-bottom: 1rem;
}

pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
}

code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 5px;
  border-radius: 3px;
}

section {
  margin-bottom: 40px;
}

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

button {
  background: var(--accent-color-1);
  border: none;
  color: var(--text-color);
  padding: 10px 20px;
  cursor: pointer;
  transition: background 0.3s ease;
  font-size: 1rem;
  border-radius: 5px;
}

button:hover {
  background: var(--accent-color-2);
}

footer {
  text-align: center;
  padding: 20px;
  background: linear-gradient(90deg, var(--accent-color-1), var(--primary-color));
  color: var(--text-color);
  margin-top: 40px;
}

@media (max-width: 768px) {
  nav {
    width: 100%;
    height: auto;
    position: static;
    box-shadow: none;
  }

  main {
    margin-left: 0;
  }

  header {
    flex-direction: column;
  }

  header h1 {
    font-size: 1.5rem;
  }
}