:root {
  --primary-color: #0074D9;
  --secondary-color: #BDC3C7;
  --accent-color: #FF851B;
  --dark-mode-bg: #121212;
  --dark-mode-text: #E0E0E0;
  --gradient-primary: linear-gradient(135deg, #0074D9, #6DD5FA);
  --gradient-secondary: linear-gradient(135deg, #BDC3C7, #F5F5F5);
}

body {
  font-family: 'Open Sans', sans-serif;
  line-height: 1.6;
  letter-spacing: 0.5px;
  color: #333;
  margin: 0;
  padding: 0;
  background: var(--gradient-primary);
}

h1, h2, h3, h4 {
  font-family: 'Montserrat', sans-serif;
  font-weight: bold;
  color: var(--primary-color);
}

.container {
  max-width: 1200px;
  margin: auto;
  padding: 20px;
  display: grid;
  gap: 20px;
}

header {
  text-align: center;
  padding: 50px 20px;
  background: var(--gradient-secondary);
  border-radius: 10px;
  margin-bottom: 20px;
}

section {
  background: rgba(255, 255, 255, 0.9);
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

pre {
  background: var(--secondary-color);
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
}

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

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

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }

  header {
    padding: 30px 10px;
  }
}

.dark-mode body {
  background: var(--dark-mode-bg);
  color: var(--dark-mode-text);
}

.dark-mode section {
  background: rgba(50, 50, 50, 0.9);
}

.dark-mode h1, .dark-mode h2, .dark-mode h3, .dark-mode h4 {
  color: var(--accent-color);
}