body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto Mono', monospace;
    height: 100vh;
    width: 100vw;
    overflow: hidden; /* No scrollbars */
}

model-viewer {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    /* ۱. مدل را در لایه بالاتر قرار بده */
    z-index: 1;
}
.watermark-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-position: center;
    pointer-events: none;
    /* ۲. واترمارک را در پایین‌ترین لایه قرار بده */
    z-index: 0; 
}

.corner-logo-overlay {
    position: absolute;
    bottom: 20px;
    right: 20px;
    max-width: 120px;
    max-height: 60px;
    pointer-events: none;
    z-index: 3;
}

.powered-by {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 12px;
    z-index: 3;
}

.ar-button {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 4px;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.25);
    color: #333;
    font-family: 'Roboto Mono', monospace;
    font-size: 14px;
    padding: 10px 16px;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
}

.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #333;
}