/* --- 1. DER FUSSBODEN --- */
body, html {
    margin: 0; padding: 0;
    width: 100%; height: 100%;
    overflow: hidden;
    background-image: url('background_texture.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* --- 2. DER TRESOR (16:9) --- */
.main-container {
    position: relative;
    width: 100vw;
    height: 56.25vw; 
    max-width: 1920px;
    max-height: 1080px;
    overflow: hidden;
    box-shadow: 0 0 30px rgba(0,0,0,0.3);
}

@media (min-aspect-ratio: 16/9) {
    .main-container {
        width: 177.78vh;
        height: 100vh;
    }
}

/* DAS BILD (Maske) */
.bg-mask {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 5;
    object-fit: contain; 
}

/* --- 3. HOTSPOTS (Röntgenblick 0.4) --- */
.hotspot {
    position: absolute;
    z-index: 10;
    cursor: pointer;
    background: rgba(255, 0, 0, 0); 
    outline: 2px solid transparent;
}

/* Back Button (Position von den vorigen Seiten übernommen) */
.btn-back { 
    top: 3.5%; 
    right: 2%; 
    width: 7%; 
    height: 6%; 
}

/* Navigations-Pfeile unten rechts */
.btn-arrow-next { 
    bottom: 6.5%; 
    right: 5.5%; 
    width: 3.5%; 
    height: 5%; 
}

.btn-arrow-prev { 
    bottom: 6.5%; 
    right: 8.5%; 
    width: 3.5%; 
    height: 5%; 
    display: none; /* Startet auf Seite 1 ausgeblendet */
}