.fp-vr-ar-3d-environment-loading-ui {
    /* Layout & Sizing System */
    --fp-container-width: 100%;
    --fp-max-width: 500px;
    --fp-aspect-ratio: 1 / 1;

    /* Semantic Color System (Ash & Charcoal Blueprint) */
    --fp-primary-color: #F7F7F7; /* Abu Sangat Terang */
    --fp-secondary-color: #E0E0E0; /* Draft Grid Lines */
    --fp-muted-color: #888888; /* Ash Subtext */
    --fp-soft-color: #CCCCCC; /* Soft accents */
    --fp-background-color: transparent;

    --fp-info-color: #555555; /* Abu Tua Accent */
    --fp-warning-color: #555555;
    --fp-danger-color: #555555;
    --fp-accent-color: #222222; /* Hitam Arang Core Accent */

    width: var(--fp-container-width);
    max-width: var(--fp-max-width);
    margin: 0 auto;
    position: relative;
    box-sizing: border-box;
    background-color: var(--fp-background-color);
    font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
}

.fp-vr-ar-3d-environment-loading-ui * {
    box-sizing: border-box;
}

.fp-vr-ar-3d-environment-loading-ui-stage {
    width: 100%;
    aspect-ratio: var(--fp-aspect-ratio);
    background-color: var(--fp-primary-color);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--fp-secondary-color);
    box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.02);
}

/* Layer 1: Base Breathing & Technical Grid Background */
.fp-vr-ar-3d-environment-loading-ui-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--fp-secondary-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--fp-secondary-color) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: center center;
    opacity: 0.6;
    animation: fp-vr-ar-3d-environment-loading-ui-breathe 8s ease-in-out infinite alternate;
}

@keyframes fp-vr-ar-3d-environment-loading-ui-breathe {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 0.8; transform: scale(1.05); }
}

/* Blueprint Corner Markers */
.fp-vr-ar-3d-environment-loading-ui-corner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 1px solid var(--fp-muted-color);
    z-index: 2;
}
.fp-vr-ar-3d-environment-loading-ui-corner-tl { top: 10px; left: 10px; border-right: none; border-bottom: none; }
.fp-vr-ar-3d-environment-loading-ui-corner-tr { top: 10px; right: 10px; border-left: none; border-bottom: none; }
.fp-vr-ar-3d-environment-loading-ui-corner-bl { bottom: 10px; left: 10px; border-right: none; border-top: none; }
.fp-vr-ar-3d-environment-loading-ui-corner-br { bottom: 10px; right: 10px; border-left: none; border-top: none; }

/* Typography / Readouts */
.fp-vr-ar-3d-environment-loading-ui-header {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--fp-accent-color);
    font-weight: 700;
    letter-spacing: 0.2em;
    z-index: 3;
    background: var(--fp-primary-color);
    padding: 0 10px;
}

.fp-vr-ar-3d-environment-loading-ui-readout {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 0.65rem;
    color: var(--fp-muted-color);
    z-index: 3;
    border-top: 1px dashed var(--fp-muted-color);
    padding-top: 8px;
}

.fp-vr-ar-3d-environment-loading-ui-coords {
    display: flex;
    gap: 15px;
}

.fp-vr-ar-3d-environment-loading-ui-val {
    color: var(--fp-accent-color);
    font-weight: bold;
}

/* Layer 2: Zooming / Radial Dimensional Rings */
.fp-vr-ar-3d-environment-loading-ui-core {
    position: relative;
    width: 200px;
    height: 200px;
    z-index: 2;
}

.fp-vr-ar-3d-environment-loading-ui-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid var(--fp-info-color);
    will-change: transform, opacity;
}

.fp-vr-ar-3d-environment-loading-ui-ring-1 {
    width: 100%;
    height: 100%;
    border-style: dashed;
    animation: 
        fp-vr-ar-3d-environment-loading-ui-zoom 4s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate,
        fp-vr-ar-3d-environment-loading-ui-spin 12s linear infinite;
}

.fp-vr-ar-3d-environment-loading-ui-ring-2 {
    width: 60%;
    height: 60%;
    border-style: solid;
    opacity: 0.5;
    animation: 
        fp-vr-ar-3d-environment-loading-ui-zoom 4s cubic-bezier(0.4, 0, 0.2, 1) infinite alternate-reverse,
        fp-vr-ar-3d-environment-loading-ui-spin-rev 8s linear infinite;
}

.fp-vr-ar-3d-environment-loading-ui-ring-3 {
    width: 20%;
    height: 20%;
    background-color: var(--fp-soft-color);
    border: none;
    opacity: 0.2;
    animation: fp-vr-ar-3d-environment-loading-ui-pulse 2s ease-in-out infinite;
}

@keyframes fp-vr-ar-3d-environment-loading-ui-zoom {
    0% { transform: translate(-50%, -50%) scale(0.6) rotate(0deg); opacity: 0.2; border-width: 1px; }
    100% { transform: translate(-50%, -50%) scale(1.4) rotate(180deg); opacity: 0.8; border-width: 2px; }
}

@keyframes fp-vr-ar-3d-environment-loading-ui-spin {
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes fp-vr-ar-3d-environment-loading-ui-spin-rev {
    100% { transform: translate(-50%, -50%) rotate(-360deg); }
}

@keyframes fp-vr-ar-3d-environment-loading-ui-pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(2.5); opacity: 0.1; }
}

/* Central Crosshair */
.fp-vr-ar-3d-environment-loading-ui-crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    z-index: 5;
}

.fp-vr-ar-3d-environment-loading-ui-crosshair::before,
.fp-vr-ar-3d-environment-loading-ui-crosshair::after {
    content: '';
    position: absolute;
    background-color: var(--fp-accent-color);
    opacity: 0.8;
    transition: all 0.1s ease;
}

.fp-vr-ar-3d-environment-loading-ui-crosshair::before {
    top: 50%; left: 0; right: 0; height: 1px; transform: translateY(-50%);
}

.fp-vr-ar-3d-environment-loading-ui-crosshair::after {
    left: 50%; top: 0; bottom: 0; width: 1px; transform: translateX(-50%);
}

/* Layer 3: Reactive Spike (Triggered by JS) */
.fp-vr-ar-3d-environment-loading-ui-crosshair.fp-vr-ar-3d-environment-loading-ui-spike::before,
.fp-vr-ar-3d-environment-loading-ui-crosshair.fp-vr-ar-3d-environment-loading-ui-spike::after {
    background-color: var(--fp-accent-color);
    opacity: 1;
    box-shadow: 0 0 10px var(--fp-accent-color);
    transform: scale(1.5);
}

.fp-vr-ar-3d-environment-loading-ui-crosshair.fp-vr-ar-3d-environment-loading-ui-spike {
    animation: fp-vr-ar-3d-environment-loading-ui-flash 0.15s ease-out;
}

@keyframes fp-vr-ar-3d-environment-loading-ui-flash {
    0% { filter: invert(1); }
    100% { filter: invert(0); }
}

/* Responsive restructuring */
@media (max-width: 480px) {
    .fp-vr-ar-3d-environment-loading-ui-core {
        width: 140px;
        height: 140px;
    }
    .fp-vr-ar-3d-environment-loading-ui-header {
        font-size: 0.65rem;
    }
    .fp-vr-ar-3d-environment-loading-ui-readout {
        flex-direction: column;
        align-items: center;
        gap: 5px;
    }
    .fp-vr-ar-3d-environment-loading-ui-grid {
        background-size: 20px 20px;
    }
}

(function() {
    // Instance Safety - Phase 2 Setup
    const components = document.querySelectorAll('.fp-vr-ar-3d-environment-loading-ui');

    components.forEach(root => {
        // Prevent multiple initializations
        if (root.dataset.fpInitialized) return;
        root.dataset.fpInitialized = 'true';

        const valX = root.querySelector('.fp-vr-ar-3d-environment-loading-ui-val-x');
        const valY = root.querySelector('.fp-vr-ar-3d-environment-loading-ui-val-y');
        const valZ = root.querySelector('.fp-vr-ar-3d-environment-loading-ui-val-z');
        const crosshair = root.querySelector('.fp-vr-ar-3d-environment-loading-ui-crosshair');

        if (!valX || !valY || !valZ || !crosshair) return;

        let rafId;
        let isVisible = true;
        let t = 0;

        // Visibility Observer to pause when off-screen
        const observer = new IntersectionObserver((entries) => {
            entries.forEach(entry => isVisible = entry.isIntersecting);
        }, { threshold: 0.1 });
        observer.observe(root);

        // Layer 3 - JS Driven Reactive Engine
        function fp_vr_ar_3d_environment_loading_ui_render() {
            // DOM removal safe check
            if (!document.body.contains(root)) {
                observer.disconnect();
                cancelAnimationFrame(rafId);
                return;
            }

            if (document.visibilityState === 'hidden' || !isVisible) {
                rafId = requestAnimationFrame(fp_vr_ar_3d_environment_loading_ui_render);
                return;
            }

            // Increment time
            t += 0.04;

            // Simulate high-speed 3D coordinate parsing
            valX.textContent = (Math.sin(t * 1.5) * 100).toFixed(2).padStart(6, ' ');
            valY.textContent = (Math.cos(t * 1.1) * 100).toFixed(2).padStart(6, ' ');
            valZ.textContent = ((Math.sin(t * 0.8) * 50) + 50).toFixed(2).padStart(6, ' ');

            // Layer 3 Reactive Spike (Random Technical Glitch/Flash)
            if (Math.random() > 0.985) { // Occurs occasionally
                crosshair.classList.add('fp-vr-ar-3d-environment-loading-ui-spike');
                setTimeout(() => {
                    if (crosshair) crosshair.classList.remove('fp-vr-ar-3d-environment-loading-ui-spike');
                }, 150);
            }

            rafId = requestAnimationFrame(fp_vr_ar_3d_environment_loading_ui_render);
        }

        // Init Engine
        rafId = requestAnimationFrame(fp_vr_ar_3d_environment_loading_ui_render);
    });
})();