body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #fff;
    background-color: #000;
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: rgba(0, 0, 0, 0.8);
    color: #0ff;
    padding: 1em 0;
    text-align: center;
    box-shadow: 0 0 10px #0ff;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1em;
}

.signup form {
    display: flex;
    flex-direction: column;
    max-width: 300px;
}

.signup input[type="email"] {
    padding: 0.5em;
    margin-bottom: 1em;
    border: 1px solid #0ff;
    background-color: rgba(255,255,255,0.1);
    color: #fff;
    border-radius: 4px;
}

.signup button {
    padding: 0.5em;
    background-color: #0ff;
    color: #000;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 0 5px #0ff;
    font-weight: bold;
}

footer {
    text-align: center;
    padding: 1em 0;
    background-color: rgba(0,0,0,0.8);
    color: #0ff;
    box-shadow: 0 0 10px #0ff inset;
}

canvas#constellation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}