body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f4f8;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

/* Fixierter Button oben links am Bildrand */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    background-color: #6c757d;
    color: white !important;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    font-weight: bold;
    z-index: 9999;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.container {
    background-color: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
    text-align: center;
}

h1 { 
    color: #0056b3; 
    margin-bottom: 10px; 
}

p { 
    color: #666; 
    margin-bottom: 30px; 
}

.input-box { 
    background-color: #f8f9fa; 
    border: 1px solid #e0e0e0; 
    text-align: left; 
    padding: 25px; 
    border-radius: 10px; 
}

label { 
    font-weight: bold; 
    display: block; 
    margin-bottom: 10px; 
    color: #444; 
}

/* Styling für das Datei-Upload Feld */
input[type="file"] {
    width: 100%;
    padding: 10px;
    background: #fff;
    border: 1px dashed #bbb;
    border-radius: 6px;
    cursor: pointer;
}

.action-btn { 
    width: 100%; 
    padding: 15px; 
    border-radius: 8px; 
    border: none; 
    font-weight: bold; 
    cursor: pointer; 
    margin-top: 20px; 
    transition: background 0.3s; 
}

.primary { 
    background-color: #28a745; 
    color: white; 
    font-size: 1.1rem; 
}

.primary:hover { 
    background-color: #218838; 
}

#statusMsg {
    padding: 15px;
    border-radius: 6px;
    background-color: #e9f7ef;
    border: 1px solid #28a745;
}