body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f0f0f;
  color: #eee;
}
header, footer {
  text-align: center;
  padding: 2rem;
}
nav a {
  color: #00aaff;
  margin: 0 1rem;
  text-decoration: none;
}
section {
  padding: 4rem 2rem;
}
.hero {
  position: relative;
  height: 100vh;
  overflow: hidden;
}
.hero video {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-text {
  position: relative;
  z-index: 2;
  padding: 4rem;
  text-align: center;
}
.module {
  background: #1b1b1b;
  margin: 1rem auto;
  padding: 2rem;
  border-radius: 10px;
  max-width: 800px;
  text-align: center;
}