/* Hintergrund-Verlauf: sanftes Hellgrün in der Mitte -> nach außen Hellblau */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    min-height: 100vh;
    background: radial-gradient(circle, #ccffcc 50%, #cce6ff 100%);
    display: flex;
    flex-direction: column;
}

/* Header-Menü */
header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(6px);
    padding: 15px 30px;
    display: flex;
    justify-content: flex-end;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
}

header nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #333;
    font-weight: bold;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #007acc;
}

/* Hauptinhalt */
main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 40px;
    font-size: 1.2rem;
    color: #222;
}