:root {
    --bg-color: #1a1a1a;
    --card-color: #2d2d2d;
    --accent-color: #ffffff;
    --text-color: #e0e0e0;
}

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

.app-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    text-align: center;
}

#preview-container {
    width: 300px;
    height: 300px;
    margin: 20px auto;
    background: #000;
    border: 10px solid #333; /* Simulierter Dia-Rahmen */
    border-bottom-width: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

button, select {
    padding: 15px;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    cursor: pointer;
}

.btn-primary { background: #444; color: white; }
.btn-send { background: #28a745; color: white; font-weight: bold; }
.btn-send:disabled { background: #555; opacity: 0.5; }

.hidden { display: none; }