body {
    background-color: #1e1e1e;
    color: #e0e0e0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    text-align: center;
    padding: 20px;
    max-width: 400px;
    width: 100%;
}
input[type="number"], select {
    background-color: #2d2d2d;
    color: #e0e0e0;
    border: 1px solid #444;
    padding: 10px;
    width: 100%;
    max-width: 300px;
    border-radius: 5px;
    font-size: 16px;
    outline: none;
    margin-bottom: 10px;
}
input[type="number"]::placeholder {
    color: #888;
}
select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}
button {
    background-color: #4a4a4a;
    color: #e0e0e0;
    border: none;
    padding: 10px 20px;
    margin: 10px;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}
button:hover {
    background-color: #5a5a5a;
}
.result {
    color: #4caf50;
    font-weight: bold;
    margin-top: 20px;
    font-size: 18px;
}
.error {
    color: #f44336;
    margin-top: 20px;
    font-size: 16px;
}
.back {
    font-size: 14px;
    color: #888;
    text-decoration: none;
    display: block;
    margin-top: 20px;
}
.back:hover {
    color: #e0e0e0;
}
.footer {
    position: absolute;
    bottom: 10px;
    width: 100%;
    text-align: center;
    color: #888;
    font-size: 12px;
}
h2 {
    font-size: 24px;
    margin-bottom: 20px;
}
.ramttoppen-link {
    color: #4caf50;
    text-decoration: none;
    font-weight: bold;
    position: relative;
    transition: color 0.3s;
    animation: glow 2s infinite alternate;
}
.ramttoppen-link:hover {
    color: #fff;
    text-shadow: 0 0 8px #4caf50, 0 0 16px #4caf50;
}
@keyframes glow {
    from {
        text-shadow: 0 0 5px #4caf50, 0 0 10px #4caf50;
    }
    to {
        text-shadow: 0 0 20px #4caf50, 0 0 40px #4caf50;
    }
}