/* ===== Section cube rail ===== */

.cube-rail {
    --cube-size: 138px;
    --face-size: 126px;
    --cube-half: calc(var(--cube-size) / 2);
    --face-inset: calc((var(--cube-size) - var(--face-size)) / 2);
    --logo-red: #ec0000;

    position: fixed;
    z-index: 6;
    top: clamp(96px, 16vh, 168px);
    /* Approximate gutter until JS measures .container — reduces jump if boot flash slips */
    left: max(8px, calc((100vw - min(1240px, 100vw - 48px)) / 2 - 196px - 28px));
    width: 196px;
    height: 228px;
    pointer-events: none;
    overflow: visible;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Hidden until placeCubeRail() sets the real left — no transition so no jump-fade */
.cube-rail.is-booting {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transition: none !important;
}

/* Not enough space left of content (narrow / zoom) */
.cube-rail.is-collapsed {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

.cube-rail .cube-slot {
    position: relative;
    width: 196px;
    height: 228px;
    overflow: visible;
}

.cube-rail.is-hidden {
    opacity: 0;
    visibility: hidden;
    transition: opacity 200ms ease, visibility 200ms ease;
}

.cube-rail:not(.is-hidden) {
    opacity: 1;
    visibility: visible;
    transition: opacity 220ms ease;
}

/* Invisible hit target on top of the cube */
.cube-hit {
    position: absolute;
    z-index: 3;
    inset: 18% 22% 22%;
    cursor: pointer;
    pointer-events: auto;
    background: transparent;
    border: 0;
    padding: 0;
    outline: none;
    box-shadow: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* 5-click easter focuses the button — never show a red focus “frame” */
.cube-hit:focus,
.cube-hit:focus-visible,
.cube-hit:active {
    outline: none !important;
    box-shadow: none !important;
}

/* ===== CSS 3D cube ===== */

.cube-3d-wrap {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    perspective: 820px;
    perspective-origin: 50% 45%;
    overflow: visible;
    pointer-events: none;
}

.cube-3d-iso {
    width: var(--cube-size);
    height: var(--cube-size);
    transform: rotateX(-30deg) rotateY(40deg);
    transform-style: preserve-3d;
}

.cube-3d-flipper {
    position: relative;
    width: var(--cube-size);
    height: var(--cube-size);
    transform-style: preserve-3d;
    transition: transform 0.26s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    pointer-events: auto;
    cursor: pointer;
}

.cube-3d-flipper.is-exit {
    transition-timing-function: cubic-bezier(0.55, 0, 1, 0.45);
    transform: rotateX(90deg);
}

.cube-3d-flipper.is-enter-prep {
    transition: none;
    transform: rotateX(-90deg);
}

.cube-3d-flipper.is-enter {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    transform: rotateX(0deg);
}

.cube-face {
    position: absolute;
    top: var(--face-inset);
    left: var(--face-inset);
    width: var(--face-size);
    height: var(--face-size);
    display: grid;
    place-items: center;
    backface-visibility: hidden;
    background: var(--logo-red);
    color: #fff;
    font-family: "Montserrat", system-ui, sans-serif;
    font-size: 78px;
    font-weight: 900;
    font-style: normal;
    line-height: 1;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    -webkit-user-select: none;
    user-select: none;
    box-shadow: none;
    outline: none;
    -webkit-font-smoothing: antialiased;
}

.cube-face[data-face="front"] {
    transform: rotateY(0deg) translateZ(var(--cube-half));
}

.cube-face[data-face="back"] {
    transform: rotateY(180deg) translateZ(var(--cube-half));
}

.cube-face[data-face="right"] {
    transform: rotateY(90deg) translateZ(var(--cube-half));
}

.cube-face[data-face="left"] {
    transform: rotateY(-90deg) translateZ(var(--cube-half));
}

.cube-face[data-face="top"] {
    transform: rotateX(90deg) translateZ(var(--cube-half));
}

.cube-face[data-face="bottom"] {
    transform: rotateX(-90deg) translateZ(var(--cube-half));
}

.cube-3d-iso::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 100%;
    width: 88px;
    height: 18px;
    margin-top: 26px;
    background: radial-gradient(ellipse, rgba(0, 0, 0, 0.4) 0%, transparent 72%);
    transform: translateX(-50%);
    pointer-events: none;
}

@media (max-width: 1100px) {
    .cube-rail {
        display: none;
    }
}

/* Extra-safe: hide on short viewports / heavy zoom */
@media (max-width: 1280px), (max-height: 560px) {
    .cube-rail {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .cube-3d-flipper {
        transition-duration: 1ms !important;
    }
}