html, body, h1, h2, h3, h4, h5, h6, p, div, section, article, header, footer {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  height: 100%;
  width: 100%;
  font-family: 'Orbitron', sans-serif;
  color: white;
  overflow: hidden;
}

#bg-video {
  position: fixed;
  top: 0;
  left: 0;
  min-width: 100%;
  min-height: 100%;
  object-fit: cover;
  z-index: -1;
}

.overlay {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  text-align: center;
  background: rgba(0, 0, 0, 0.5);
  padding: 1rem;
}

.overlay h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

#countdown {
  font-size: 1.5rem;
  font-weight: bold;
}

@media (min-width: 768px) {
  .overlay h1 {
    font-size: 3rem;
  }
  #countdown {
    font-size: 2rem;
  }
}