/* Interactive 3D page navigator. Kept independent from the page shells so it
   can be shared by the hand-authored and PAPERBIT pages. */

:root {
  --cube-ink: #292824;
  --cube-muted: #6c6962;
  --cube-paper: #fbfaf3;
  --cube-rule: rgba(41, 40, 36, 0.18);
  --cube-signal: #c2401f;
  --cube-size: min(56vw, 58vh, 580px);
}

html.cube-view-open,
html.cube-view-open body {
  overflow: hidden;
  overscroll-behavior: none;
}

.cube-fab {
  position: fixed;
  right: max(22px, env(safe-area-inset-right));
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 10002;
  display: grid;
  width: 68px;
  height: 68px;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  background: var(--cube-ink);
  box-shadow: 0 10px 30px rgba(41, 40, 36, 0.25);
  color: #fff;
  cursor: pointer;
  font-family: var(--pb-font-body, Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  -webkit-tap-highlight-color: transparent;
  transition: background-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.cube-fab:hover {
  background: var(--cube-signal);
  box-shadow: 0 14px 36px rgba(41, 40, 36, 0.3);
  transform: translateY(-2px);
}

.cube-fab:active {
  transform: translateY(0) scale(0.96);
}

.cube-fab:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--cube-signal), 0 14px 36px rgba(41, 40, 36, 0.3);
}

.cube-fab__content {
  display: grid;
  place-items: center;
  gap: 2px;
  line-height: 1;
}

.cube-fab__icon {
  position: relative;
  display: block;
  width: 25px;
  height: 25px;
}

.cube-fab__icon--cube {
  width: 21px;
  height: 21px;
  border: 1.5px solid currentColor;
  transform: rotate(30deg) skewY(-30deg) scaleY(0.86);
}

.cube-fab__icon--cube::before,
.cube-fab__icon--cube::after {
  content: "";
  position: absolute;
  background: currentColor;
  transform-origin: center;
}

.cube-fab__icon--cube::before {
  top: 9px;
  left: -1px;
  width: 21px;
  height: 1.5px;
  transform: rotate(-30deg) skewY(30deg) scaleY(1.16);
}

.cube-fab__icon--cube::after {
  top: -1px;
  left: 9px;
  width: 1.5px;
  height: 21px;
  transform: rotate(-30deg) skewY(30deg) scaleY(1.16);
}

.cube-fab__icon--close::before,
.cube-fab__icon--close::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 2px;
  width: 21px;
  height: 1.8px;
  border-radius: 2px;
  background: currentColor;
}

.cube-fab__icon--close::before { transform: rotate(45deg); }
.cube-fab__icon--close::after { transform: rotate(-45deg); }

.cube-fab__label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cube-fab__open,
.cube-fab__close {
  grid-area: 1 / 1;
  transition: opacity 160ms ease, transform 220ms ease;
}

.cube-fab__close {
  opacity: 0;
  transform: rotate(-45deg) scale(0.72);
}

.cube-fab[aria-checked="true"] {
  background: var(--cube-signal);
}

.cube-fab[aria-checked="true"] .cube-fab__open {
  opacity: 0;
  transform: rotate(45deg) scale(0.72);
}

.cube-fab[aria-checked="true"] .cube-fab__close {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.cube-view {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  min-height: 100dvh;
  overflow: hidden;
  color: var(--cube-ink);
  font-family: var(--pb-font-body, Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 320ms ease, visibility 0s linear 320ms;
}

.cube-view::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(41, 40, 36, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(41, 40, 36, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 50% 46%, #fff 0, var(--cube-paper) 52%, #eee9dc 100%);
  background-size: 32px 32px, 32px 32px, auto;
}

.cube-view.is-open {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transition-delay: 0s;
}

.cube-view__header {
  position: absolute;
  top: max(26px, env(safe-area-inset-top));
  right: 28px;
  left: 28px;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  pointer-events: none;
}

.cube-view__eyebrow {
  margin: 0 0 6px;
  color: var(--cube-signal);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cube-view__title {
  margin: 0;
  font-family: var(--pb-font-display, Georgia, serif);
  font-size: clamp(28px, 3.2vw, 48px);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1;
}

.cube-view__hint {
  max-width: 260px;
  margin: 4px 94px 0 0;
  color: var(--cube-muted);
  font-family: var(--pb-font-mono, ui-monospace, monospace);
  font-size: 11px;
  letter-spacing: 0.05em;
  line-height: 1.5;
  text-align: right;
  text-transform: uppercase;
}

.cube-stage {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  min-height: 100dvh;
  cursor: grab;
  perspective: 1500px;
  perspective-origin: 50% 48%;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

.cube-stage:active {
  cursor: grabbing;
}

.cube-stage:focus-visible {
  outline: none;
}

.cube-stage:focus-visible::after {
  content: "";
  position: absolute;
  inset: 18px;
  border: 2px solid var(--cube-signal);
  border-radius: 4px;
  pointer-events: none;
}

.cube-stage__shadow {
  position: absolute;
  top: calc(50% + (var(--cube-size) * 0.42));
  left: 50%;
  width: calc(var(--cube-size) * 0.92);
  height: calc(var(--cube-size) * 0.2);
  border-radius: 50%;
  background: rgba(41, 40, 36, 0.28);
  filter: blur(28px);
  opacity: 0.55;
  transform: translate(-50%, -50%) rotateX(72deg);
}

.page-cube {
  --rotate-x: -18deg;
  --rotate-y: 32deg;
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--cube-size);
  height: var(--cube-size);
  transform: translate(-50%, -50%) translateZ(calc(var(--cube-size) * -0.5)) rotateX(var(--rotate-x)) rotateY(var(--rotate-y));
  transform-style: preserve-3d;
  transition: transform 900ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

.page-cube.is-dragging,
.page-cube.is-free {
  transition: none;
}

.cube-face {
  position: absolute;
  inset: 0;
  overflow: visible;
  border: 1px solid rgba(41, 40, 36, 0.32);
  background: #fff;
  box-shadow: inset 0 0 44px rgba(41, 40, 36, 0.07);
  color: inherit;
  cursor: pointer;
  text-decoration: none;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.cube-face:focus-visible {
  outline: 3px solid #fff;
  outline-offset: -4px;
}

.cube-face::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 45%, rgba(20, 18, 14, 0.58) 100%);
  pointer-events: none;
}

.cube-face--front { transform: rotateY(0deg) translateZ(calc(var(--cube-size) * 0.5)); }
.cube-face--right { transform: rotateY(90deg) translateZ(calc(var(--cube-size) * 0.5)); }
.cube-face--back { transform: rotateY(180deg) translateZ(calc(var(--cube-size) * 0.5)); }
.cube-face--left { transform: rotateY(-90deg) translateZ(calc(var(--cube-size) * 0.5)); }
.cube-face--top { transform: rotateX(90deg) translateZ(calc(var(--cube-size) * 0.5)); }
.cube-face--bottom { transform: rotateX(-90deg) translateZ(calc(var(--cube-size) * 0.5)); }

.cube-face__viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: var(--cube-paper);
}

.cube-face__viewport img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  pointer-events: none;
}

.cube-face__meta {
  position: absolute;
  right: clamp(14px, 3.2vw, 26px);
  bottom: clamp(14px, 3.2vw, 26px);
  left: clamp(14px, 3.2vw, 26px);
  z-index: 2;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  color: #fff;
  pointer-events: none;
}

.cube-face__number {
  display: block;
  margin-bottom: 5px;
  font-family: var(--pb-font-mono, ui-monospace, monospace);
  font-size: 10px;
  letter-spacing: 0.12em;
  opacity: 0.72;
  text-transform: uppercase;
}

.cube-face__title {
  max-width: 15ch;
  margin: 0;
  font-family: var(--pb-font-display, Georgia, serif);
  font-size: clamp(20px, 3vw, 34px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.02;
  text-wrap: balance;
}

.cube-face__visit {
  display: inline-grid;
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  background: rgba(251, 250, 243, 0.14);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  pointer-events: none;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.cube-face:hover .cube-face__visit,
.cube-face:focus-visible .cube-face__visit {
  background: #fff;
  color: var(--cube-ink);
  transform: scale(1.06);
}

.cube-view__status {
  position: absolute;
  right: 116px;
  bottom: max(36px, env(safe-area-inset-bottom));
  z-index: 2;
  margin: 0;
  color: var(--cube-muted);
  font-family: var(--pb-font-mono, ui-monospace, monospace);
  font-size: 10px;
  letter-spacing: 0.1em;
  pointer-events: none;
  text-transform: uppercase;
}

@supports not (transform-style: preserve-3d) {
  .cube-stage {
    overflow: auto;
  }

  .page-cube {
    position: relative;
    top: 110px;
    left: 0;
    display: grid;
    width: auto;
    height: auto;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    padding: 24px;
    transform: none;
  }

  .cube-face {
    position: relative;
    aspect-ratio: 1;
    transform: none;
  }
}

@media (max-width: 700px) {
  :root {
    --cube-size: min(76vw, 47vh, 390px);
  }

  .cube-view__header {
    top: max(22px, env(safe-area-inset-top));
    right: 20px;
    left: 20px;
  }

  .cube-view__title {
    font-size: 30px;
  }

  .cube-view__hint {
    display: none;
  }

  .cube-stage {
    perspective: 1050px;
    perspective-origin: 50% 52%;
  }

  .page-cube {
    top: 53%;
  }

  .cube-stage__shadow {
    top: calc(53% + (var(--cube-size) * 0.42));
  }

  .cube-face__meta {
    right: 16px;
    bottom: 16px;
    left: 16px;
  }

  .cube-face__title {
    font-size: clamp(19px, 7vw, 28px);
  }

  .cube-face__visit {
    width: 42px;
    height: 42px;
  }

  .cube-fab {
    right: max(16px, env(safe-area-inset-right));
    bottom: max(16px, env(safe-area-inset-bottom));
    width: 62px;
    height: 62px;
  }

  .cube-view__status {
    right: 94px;
    bottom: max(27px, env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  .cube-view,
  .page-cube,
  .cube-fab,
  .cube-fab__open,
  .cube-fab__close,
  .cube-face__visit {
    animation: none !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}