* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body, html {
  height: 100%;
  overflow: hidden;
  font-family: 'Segoe UI', sans-serif;
  background: #000;
  color: #fff;
}
.background {
  position: relative;
  width: 100%;
  height: 100%;
}
canvas#filaments {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}
.overlay {
  position: relative;
  z-index: 1;
  text-align: center;
  top: 40%;
  transform: translateY(-50%);
  padding: 20px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 12px;
  max-width: 600px;
  margin: 0 auto;
}
h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  color: #80ffcc;
}
p {
  font-size: 1.2rem;
  color: #ccc;
  margin-bottom: 2rem;
}
button {
  padding: 10px 20px;
  background: #00cc99;
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}
button:hover {
  background: #009977;
}