body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    color: white;
    background: linear-gradient(135deg, red, orange, yellow, green, blue, indigo, violet);
    background-size: 200% 200%;
    animation: gradientMove 10s ease infinite;
}
@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}
header, footer, section {
    text-align: center;
    padding: 1em;
}
nav a {
    margin: 0 10px;
    color: white;
    text-decoration: none;
    font-weight: bold;
}
.kontakt-box {
    max-width: 400px;
    margin: auto;
    padding: 2em;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
}
input, textarea {
    width: 100%;
    margin: 0.5em 0;
    padding: 0.7em;
    border-radius: 8px;
    border: none;
}
button {
    padding: 0.7em 1.5em;
    background: white;
    color: black;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}