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

body {
  font-family: 'Arial', sans-serif;
  background: #000;
  color: white;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  width: 100%;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: white;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-size: 16px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  transform: scale(1.1);
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 30px;
  padding: 20px;
}

.demo-button {
  background: rgba(0, 0, 0, 0.8);
  color: white;
  text-decoration: none;
  padding: 20px 60px;
  font-size: 18px;
  font-weight: 500;
  text-align: center;
  width: 300px;
  border: 1px solid #333;
  transition: all 0.3s ease;
}

.demo-button:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
}

/* Tablet styles */
@media (max-width: 768px) {
  header {
    padding: 15px 25px;
  }
  
  .logo {
    font-size: 20px;
  }
  
  .nav-links {
    gap: 20px;
  }
  
  .nav-link {
    font-size: 14px;
  }
  
  .demo-button {
    width: 280px;
    padding: 18px 50px;
    font-size: 16px;
  }
  
  main {
    gap: 25px;
  }
}

/* Phone styles */
@media (max-width: 480px) {
  header {
    padding: 15px 20px;
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
  
  .logo {
    font-size: 18px;
  }
  
  .nav-links {
    gap: 15px;
  }
  
  .nav-link {
    font-size: 13px;
  }
  
  .demo-button {
    width: 250px;
    padding: 15px 40px;
    font-size: 15px;
  }
  
  main {
    gap: 20px;
    padding: 15px;
  }
}