:root {
    --accent-cyan: aqua;
}

body {
    background-color: #111;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

h1 {
    color: white;
    text-align: center;
    margin: auto;
}

footer {
    text-align: center;
    padding: 3rem;
    margin-top: 2rem;
}

.back-link {
    display: inline-block;
    color: #aaa;
    text-decoration: none;
    font-size: 1rem;
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
    padding-bottom: 2px;
}

.back-link:hover {
    color: var(--accent-cyan);
    border-bottom-color: var(--accent-cyan);
}