body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: url('/static/img/bg.png') no-repeat center center fixed;
    background-size: cover;
    /* Fallback: Farbe, falls kein Bild geladen werden kann */
    background-color: #222b3c;
}
.overlay {
    background: rgba(25,30,40,0.92); /* halbtransparenter Layer */
    min-height: 100vh;
    padding: 40px 0 40px 0;
}
.main-content {
    max-width: 900px;
    margin: auto;
    background: rgba(30,35,50,0.95);
    border-radius: 16px;
    box-shadow: 0 4px 24px #0009;
    padding: 32px;
    color: #fff;
    border: 2px solid #384065;
}
h1, h2, h3, h4 {
    color: #66c0ff;
    text-shadow: 0 2px 6px #0009;
}
a, a:visited {
    color: #8dcaff;
}
.form-control, .form-select {
    background: #222b3c;
    color: #eee;
    border: 1px solid #445288;
    border-radius: 7px;
}
.btn-primary {
    background-color: #1274aa;
    border: none;
    color: #fff;
    border-radius: 6px;
    font-weight: bold;
}
.btn-primary:hover {
    background-color: #2e9fdf;
    color: #222;
}
pre, code {
    background: #111825;
    color: #fffd;
    border-radius: 6px;
    padding: 6px 10px;
}
.card {
    background: #232b47cc;
    border-radius: 14px;
    margin-bottom: 20px;
    box-shadow: 0 1px 6px #0005;
}
hr {
    border: 1px solid #4b587a;
}
.alert, .alert-info, .alert-danger {
    background: #193453cc;
    color: #ade;
    border-radius: 6px;
    border: 1px solid #355;
    padding: 10px 18px;
}