body {
  margin: 0;
  font-family: 'Open Sans', sans-serif;
  background: linear-gradient(to bottom, #000, #111);
  color: white;
}
header nav {
  background: linear-gradient(to right, gold, green);
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 15px;
}
nav ul li a {
  text-decoration: none;
  color: white;
  font-weight: bold;
}
.hero {
  text-align: center;
  padding: 100px 20px;
  background: url('gym-bg.jpg') center/cover no-repeat;
  backdrop-filter: blur(5px);
}
.btn {
  background: linear-gradient(to right, green, gold);
  padding: 10px 20px;
  border: none;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}
.btn.secondary {
  background: gold;
  color: black;
}
footer {
  text-align: center;
  padding: 20px;
  background: #000;
  border-top: 1px solid gold;
}