* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    background-color: #0f4f4f;
    background-image:
        radial-gradient(#176b6b 1px, transparent 1px);
    background-size: 8px 8px;
    font-family: monospace;
}


/* =========================
   FIXED DESIGN CANVAS
   ========================= */

.entrance {
    position: absolute;

    left: 50%;
    top: 50%;

    width: 1920px;
    height: 1080px;

    transform-origin: center center;
    transform:
        translate(-50%, -50%)
        scale(min(
            calc(100vw / 1920px),
            calc(100vh / 1080px)
        ));
}


/* =========================
   MUSEUM EXTERIOR
   ========================= */

.entrance-background {
    position: absolute;

    left: 0;
    top: 0;

    width: 1920px;
    height: 1080px;

    object-fit: contain;
    display: block;
}


/* =========================
   LANDING MESSAGE
   ========================= */

.landing-message {
    position: absolute;
    z-index: 2;

    top: 80px;
    left: 50%;
    transform: translateX(-50%);

    width: 600px;
    padding: 20px;

    text-align: center;

    background: rgba(255, 255, 255, 0.9);
    border: 3px solid black;
}

.landing-message h1 {
    margin: 0 0 10px;
}

.landing-message p {
    margin: 8px 0;
}

.landing-instruction {
    font-weight: bold;
}


/* =========================
   FRONT DOOR HOTSPOT
   ========================= */

/* Bright red while positioning the hotspot. */

.entrance-door {
    position: absolute;
    z-index: 3;

    left: 845px;
    top: 725px;

    width: 190px;
    height: 270px;

    display: block;
    cursor: pointer;
}