/* =================================================================
   OPTA SPATIAL 3D NAVIGATION SYSTEM
   Pure CSS 3D with perspective transforms
   ================================================================= */

/* -----------------------------------------------------------------
   1. VIEWPORT & PERSPECTIVE CONTAINER
   ----------------------------------------------------------------- */

.spatial-viewport {
    position: fixed;
    inset: 0;
    perspective: 1200px;
    perspective-origin: 50% 50%;
    overflow: hidden;
    background: var(--void);
}

/* The 3D scene that transforms */
.spatial-scene {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    transform: translateZ(var(--scene-z, 0)) translateX(var(--scene-x, 0));
    will-change: transform;
}

/* Smooth physics transition for navigation */
.spatial-scene.navigating {
    transition: transform 0.9s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* -----------------------------------------------------------------
   2. DEPTH LAYERS
   ----------------------------------------------------------------- */

.depth-layer {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.4s ease;
    will-change: transform, opacity;
}

/* Layer depth positions */
.depth-layer[data-layer="0"] { transform: translateZ(0); }
.depth-layer[data-layer="1"] { transform: translateZ(-500px); }
.depth-layer[data-layer="2"] { transform: translateZ(-1000px); }
.depth-layer[data-layer="3"] { transform: translateZ(-1500px); }

/* Fade distant layers slightly for depth perception */
.depth-layer[data-layer="1"] { opacity: 0.95; }
.depth-layer[data-layer="2"] { opacity: 0.9; }
.depth-layer[data-layer="3"] { opacity: 0.85; }

/* Active layer gets full opacity */
.depth-layer.active {
    opacity: 1;
}

/* Layer content wrapper */
.layer-content {
    width: 100%;
    max-width: 1200px;
    height: 100%;
    padding: 6rem 2rem 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transform-style: preserve-3d;
}

/* -----------------------------------------------------------------
   3. HORIZONTAL TRACK SYSTEM
   ----------------------------------------------------------------- */

.horizontal-track {
    display: flex;
    width: max-content;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    transform: translateX(var(--track-x, 0));
    will-change: transform;
}

.horizontal-panel {
    width: 100vw;
    height: 100vh;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem 4rem;
    box-sizing: border-box;
}

/* Panel content constraint */
.panel-content {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* -----------------------------------------------------------------
   4. EDGE NAVIGATION HINTS
   ----------------------------------------------------------------- */

.edge-hints {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1000;
}

.edge-hint {
    position: absolute;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Arrow shapes using SVG background */
.edge-hint::before {
    content: '';
    position: absolute;
    width: 40px;
    height: 40px;
    background: var(--primary);
    opacity: 0.4;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    filter: blur(1px);
}

.edge-hint::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(139, 92, 246, 0.2),
        transparent
    );
}

/* Top edge (navigate backward/up) */
.edge-hint.edge-top {
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 50px;
}

.edge-hint.edge-top::before {
    left: 50%;
    transform: translateX(-50%);
}

/* Bottom edge (navigate forward/down) */
.edge-hint.edge-bottom {
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 50px;
}

.edge-hint.edge-bottom::before {
    left: 50%;
    transform: translateX(-50%) rotate(180deg);
    bottom: 0;
}

.edge-hint.edge-bottom::after {
    background: linear-gradient(
        to top,
        rgba(139, 92, 246, 0.2),
        transparent
    );
}

/* Left edge */
.edge-hint.edge-left {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 120px;
}

.edge-hint.edge-left::before {
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
}

.edge-hint.edge-left::after {
    background: linear-gradient(
        to right,
        rgba(139, 92, 246, 0.2),
        transparent
    );
}

/* Right edge */
.edge-hint.edge-right {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 120px;
}

.edge-hint.edge-right::before {
    top: 50%;
    right: 0;
    transform: translateY(-50%) rotate(90deg);
}

.edge-hint.edge-right::after {
    background: linear-gradient(
        to left,
        rgba(139, 92, 246, 0.2),
        transparent
    );
}

/* Show when direction is available */
.edge-hint.available {
    opacity: 0.3;
}

.edge-hint.available.proximity {
    opacity: 0.6;
    pointer-events: auto;
    cursor: pointer;
}

.edge-hint.available.proximity:hover {
    opacity: 0.8;
}

.edge-hint.available.proximity::before {
    animation: hint-pulse 1.5s ease-in-out infinite;
}

@keyframes hint-pulse {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.7; transform: translateX(-50%) scale(1.1); }
}

/* -----------------------------------------------------------------
   5. NAVIGATION INDICATOR OVERLAY
   ----------------------------------------------------------------- */

.nav-indicator {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 900;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.nav-indicator:hover {
    opacity: 1;
}

.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-dot.active {
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary-glow);
    transform: scale(1.25);
}

.nav-dot:hover:not(.active) {
    background: var(--text-secondary);
    transform: scale(1.1);
}

/* Layer name label */
.layer-label {
    position: fixed;
    top: 100px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 900;
}

.layer-label.visible {
    opacity: 1;
}

/* -----------------------------------------------------------------
   6. 3D FLOATING ELEMENTS
   ----------------------------------------------------------------- */

/* Elements that float at different depths */
.float-element {
    transform-style: preserve-3d;
    transform: translateZ(var(--float-z, 0));
    transition: transform 0.5s var(--ease-spring);
}

.float-element:hover {
    transform: translateZ(calc(var(--float-z, 0) + 30px)) scale(1.02);
}

/* Depth variations */
.float-near { --float-z: 40px; }
.float-mid { --float-z: 20px; }
.float-far { --float-z: -20px; }

/* -----------------------------------------------------------------
   7. RESPONSIVE ADJUSTMENTS
   ----------------------------------------------------------------- */

@media (max-width: 768px) {
    .spatial-viewport {
        perspective: 800px;
    }

    .depth-layer[data-layer="1"] { transform: translateZ(-400px); }
    .depth-layer[data-layer="2"] { transform: translateZ(-800px); }
    .depth-layer[data-layer="3"] { transform: translateZ(-1200px); }

    .layer-content {
        padding: 5rem 1.5rem 3rem;
    }

    .edge-hint {
        display: none; /* Hide edge hints on mobile - use swipe */
    }

    .nav-indicator {
        bottom: 30px;
    }
}

/* -----------------------------------------------------------------
   8. REDUCED MOTION
   ----------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .spatial-scene {
        transition: transform 0.15s linear !important;
    }

    .horizontal-track {
        transition: transform 0.15s linear !important;
    }

    .depth-layer {
        transition: opacity 0.1s linear !important;
    }

    .edge-hint.available.proximity::before {
        animation: none !important;
    }
}

/* -----------------------------------------------------------------
   9. ACCESSIBILITY
   ----------------------------------------------------------------- */

/* Screen reader announcements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#a11y-announce {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}