.menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 4vh, 40px);
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
  padding: clamp(56px, 9vh, 72px) 16px clamp(16px, 4vh, 32px);
}

.menu__header {
  text-align: center;
  animation: fade-up 0.6s var(--ease-out) backwards;
  transition: opacity 0.35s, transform 0.5s var(--ease-in);
}

.menu__title {
  margin-top: 8px;
  font-size: clamp(1.6rem, 4.5vw, 2.6rem);
  font-weight: 800;
}

.menu__title span {
  font-weight: 300;
  color: var(--gc-silver);
}

/* Diamond layout: four options around the cube. */
.menu__stage {
  /* Follows the window height too, so the whole menu always fits without scrolling. */
  --cube: clamp(80px, min(20vw, 18dvh), 180px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas:
    '.    top    .'
    'left cube   right'
    '.    bottom .';
  align-items: center;
  justify-items: center;
  gap: clamp(8px, 2.5vw, 28px) clamp(10px, 4vw, 56px);
  width: min(100%, 820px);
}

.menu__cube {
  grid-area: cube;
  width: calc(var(--cube) * 1.9);
  height: calc(var(--cube) * 1.9);
  display: grid;
  place-items: center;
  animation: cube-in 0.9s var(--ease-out) backwards;
  transition: transform 0.65s var(--ease-in), opacity 0.5s ease 0.15s;
}

@keyframes cube-in {
  from {
    opacity: 0;
    transform: scale(0.5);
  }
}

.menu-opt--top { grid-area: top; }
.menu-opt--left { grid-area: left; justify-self: end; text-align: right; }
.menu-opt--right { grid-area: right; justify-self: start; text-align: left; }
.menu-opt--bottom { grid-area: bottom; }

.menu-opt {
  --dx: 0px;
  --dy: 0px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 230px;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  text-align: center;
  animation: opt-in 0.7s var(--ease-out) backwards;
  transition:
    background 0.25s,
    border-color 0.25s,
    box-shadow 0.25s,
    transform 0.35s var(--ease-out),
    opacity 0.4s;
}

.menu-opt--top { --dy: -30px; animation-delay: 0.15s; }
.menu-opt--left { --dx: -30px; animation-delay: 0.22s; }
.menu-opt--right { --dx: 30px; animation-delay: 0.29s; }
.menu-opt--bottom { --dy: 30px; animation-delay: 0.36s; }

@keyframes opt-in {
  from {
    opacity: 0;
    transform: translate(var(--dx), var(--dy));
  }
}

.menu-opt__label {
  font-size: clamp(0.95rem, 2.2vw, 1.25rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.menu-opt__caption {
  font-size: 0.82rem;
  color: var(--muted);
}

.menu-opt.is-active {
  background: linear-gradient(135deg, rgba(93, 74, 142, 0.55), rgba(76, 60, 117, 0.25));
  border-color: var(--primary-bright);
  box-shadow: 0 0 24px var(--glow), inset 0 0 18px rgba(255, 255, 255, 0.05);
  transform: scale(1.06);
}

.menu-opt.is-active .menu-opt__label {
  color: #fff;
  text-shadow: 0 0 12px var(--glow);
}

.menu-opt.is-active .menu-opt__caption {
  color: var(--gc-silver);
}

.menu__hint {
  color: var(--muted);
  font-size: 0.85rem;
  animation: fade-up 0.6s var(--ease-out) 0.5s backwards;
  transition: opacity 0.3s;
}

.menu__hint .pixel {
  color: var(--gc-silver);
}

/* ---------- Leaving: options fly out, cube zooms toward the viewer ---------- */
.menu--leaving .menu__header,
.menu--leaving .menu__hint {
  opacity: 0;
  transform: translateY(-10px);
}

.menu--leaving .menu-opt {
  opacity: 0;
  transform: translate(calc(var(--dx) * 3), calc(var(--dy) * 3));
}

.menu--leaving .menu-opt.is-chosen {
  opacity: 1;
  border-color: var(--accent);
  box-shadow: 0 0 32px rgba(255, 111, 0, 0.5);
  transform: scale(1.12);
  transition-duration: 0.2s;
}

.menu--leaving .menu__cube {
  transform: scale(2.6);
  opacity: 0;
}

.menu-opt:disabled {
  cursor: default;
}

/* ---------- The cube ---------- */
.cube-scene {
  position: relative;
  width: var(--cube);
  height: var(--cube);
  perspective: calc(var(--cube) * 5);
}

.cube {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
}

.cube__face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: rgba(255, 255, 255, 0.55);
  /* Faint 3x3 grid on each face, like a cube built from smaller cubes. */
  background:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px) 0 0 / 33.34% 33.34%,
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px) 0 0 / 33.34% 33.34%,
    linear-gradient(145deg, var(--gc-indigo-3), var(--gc-indigo) 60%, #2c2150);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22), inset 0 0 30px rgba(0, 0, 0, 0.35);
  backface-visibility: hidden;
  transition: color 0.3s, box-shadow 0.3s;
}

:root[data-spice='on'] .cube__face {
  background:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px) 0 0 / 33.34% 33.34%,
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px) 0 0 / 33.34% 33.34%,
    linear-gradient(145deg, #ffa04d, var(--gc-orange) 55%, #8a3200);
}

.cube__face svg {
  width: 38%;
  height: 38%;
}

.cube__face.is-lit {
  color: #fff;
  box-shadow: inset 0 0 0 2px var(--accent), inset 0 0 30px rgba(255, 111, 0, 0.25);
}

.cube__face--front { transform: translateZ(calc(var(--cube) / 2)); }
.cube__face--back { transform: rotateY(180deg) translateZ(calc(var(--cube) / 2)); }
.cube__face--right { transform: rotateY(90deg) translateZ(calc(var(--cube) / 2)); }
.cube__face--left { transform: rotateY(-90deg) translateZ(calc(var(--cube) / 2)); }
.cube__face--top { transform: rotateX(90deg) translateZ(calc(var(--cube) / 2)); }
.cube__face--bottom { transform: rotateX(-90deg) translateZ(calc(var(--cube) / 2)); }

/* Hollow square mark on the plain faces. */
.cube__mark {
  width: 34%;
  height: 34%;
  border: 3px solid rgba(255, 255, 255, 0.5);
  border-radius: 6px;
}

.cube-shadow {
  position: absolute;
  left: 50%;
  bottom: calc(var(--cube) * -0.55);
  width: 110%;
  height: 18px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(ellipse, var(--glow), transparent 70%);
  opacity: 0.6;
  filter: blur(4px);
}

/* ---------- Small screens ---------- */
@media (max-width: 640px) {
  .menu__stage {
    gap: 6px 4px;
  }

  .menu-opt {
    padding: 10px 8px;
  }

  .menu-opt__caption {
    display: none;
  }

  .menu-opt--left,
  .menu-opt--right {
    max-width: 110px;
  }

  .menu__cube {
    width: calc(var(--cube) * 1.5);
    height: calc(var(--cube) * 1.5);
  }
}

.menu__version {
  position: fixed;
  left: 16px;
  bottom: 14px;
  font-size: 0.5rem;
  color: rgba(255, 255, 255, 0.35);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
}