:root {
  --primary-color: #3498db;
  --secondary-color: #e74c3c;
  --background-color: #f0f3f5;
  --text-color: #2c3e50;
  --card-background: #ffffff;
}

body {
  font-family: 'Roboto', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 2rem 0;
  margin-bottom: 2rem;
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  animation: fadeInDown 1s ease-out;
}

.tagline {
  font-size: 1.2rem;
  opacity: 0.8;
}

.demo-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.demo-card {
  background-color: var(--card-background);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.demo-card:hover {
  transform: translateY(-5px);
}

.demo-card h2 {
  color: var(--primary-color);
  margin-top: 0;
}

.demo-card p {
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: darken(var(--primary-color), 10%);
}

#documentation {
  background-color: var(--card-background);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

footer {
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 1rem 0;
  margin-top: 2rem;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Dark mode styles */
body.dark-mode {
  --background-color: #1a1a1a;
  --text-color: #f0f0f0;
  --card-background: #2c2c2c;
}

#dark-mode-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  z-index: 1000;
}