body {
    margin: 0;
    font-family: Arial, sans-serif;
}
header {
    position: fixed;
    width: 100%;
    background: rgba(0,0,0,0.7);
    color: white;
    display: flex;
    justify-content: space-between;
    padding: 1em 2em;
    z-index: 1000;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 1em;
}
nav a {
    color: white;
    text-decoration: none;
}
.hero {
    height: 100vh;
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.overlay {
    text-align: center;
    color: white;
    background: rgba(0,0,0,0.5);
    padding: 2em;
}
.btn {
    display: inline-block;
    margin-top: 1em;
    padding: 0.5em 1em;
    background: #ffffff;
    color: #000000;
    text-decoration: none;
    font-weight: bold;
}
section {
    padding: 4em 2em;
}
footer {
    text-align: center;
    padding: 1em;
    background: #222;
    color: white;
}