body {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        /* VR Entry Overlay */
        #enter-vr-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        #enter-vr-box {
            background-color: #222;
            border: 2px solid #00FFFF;
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            max-width: 80%;
            box-shadow: 0 0 30px rgba(244, 184, 15, 0.3);
        }

        #enter-vr-heading {
            color: #00FFFF;
            font-family: Arial, sans-serif;
            font-size: 24px;
            margin-top: 0;
        }

        #enter-vr-text {
            color: white;
            font-family: Arial, sans-serif;
            margin-bottom: 25px;
            font-size: 16px;
            line-height: 1.5;
        }

        #enter-vr-button {
            background-color: #00FFFF;
            color: black;
            border: none;
            padding: 15px 40px;
            font-size: 18px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s ease;
        }

        #enter-vr-button:hover {
            background-color: #ffffff;
            transform: scale(1.05);
        }

        #vr-status {
            position: fixed;
            bottom: 20px;
            left: 20px;
            color: white;
            font-family: Arial, sans-serif;
            background-color: rgba(0, 0, 0, 0.6);
            padding: 10px;
            border-radius: 5px;
            display: none;
        }

        .loader {
            border: 5px solid #f3f3f3;
            border-top: 5px solid #00FFFF;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 20px auto;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Hide A-Frame's default VR button */
        .a-enter-vr {
            display: none !important;
        }

        /* Hide everything in VR mode except the scene */
        .a-fullscreen header,
        .a-fullscreen .btn-container,
        .a-fullscreen .color-options,
        .a-fullscreen #vr-entry-button {
            display: none !important;
        }

        /* A-Frame scene */
        a-scene {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        /* VR UI Overlay - visible in VR mode */
        .vr-ui-overlay {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            padding: 10px;
            z-index: 999;
            display: none;
        }

        .vr-ui-overlay.active {
            display: flex;
            justify-content: space-around;
            align-items: center;
        }

        .vr-ui-btn {
            background-color: #fff;
            color: black;
            border: none;
            padding: 8px 4px;
            margin: 0 5px;
            font-size: 24px;
            border-radius: 60px;
            cursor: pointer;
            font-weight: bold;
        }

        /* Added for VR 3D buttons */
        .vr-menu-panel {
            display: flex;
        }
        /* Normal-device mode: Meta Quest entry overlay not needed (2026-10-02) */
        #enter-vr-overlay, #vr-status { display: none !important; }