:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  background: #0a35c8;
  color: #11120f;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: #0a35c8;
}

button {
  font: inherit;
}

.stage {
  --turn: 0;
  --glint: 48%;
  position: relative;
  width: 100vw;
  height: 100svh;
  min-height: 32rem;
  isolation: isolate;
  overflow: hidden;
  background: #0a35c8;
}

.under-plane {
  position: absolute;
  z-index: 0;
  inset: 0;
  overflow: hidden;
  color: #f0eee5;
  background: #0a35c8;
}

.under-plane::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0,
    transparent calc(12.5vw - 1px),
    #f0eee5 calc(12.5vw - 1px),
    #f0eee5 12.5vw
  );
}

.under-header,
.masthead {
  position: absolute;
  top: clamp(1.25rem, 3.5vw, 3rem);
  left: clamp(1.25rem, 3.5vw, 3rem);
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.under-header {
  right: clamp(1.25rem, 3.5vw, 3rem);
  justify-content: space-between;
  color: #f0eee5;
}

.under-header p,
.masthead p,
.masthead h1,
.instruction,
.status,
.under-index {
  margin: 0;
  font-size: clamp(0.65rem, 1vw, 0.82rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.orbit {
  position: absolute;
  top: 50%;
  left: 58%;
  width: min(70vw, 46rem);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.orbit span {
  position: absolute;
  inset: 0;
  border: clamp(0.16rem, 0.35vw, 0.3rem) solid #f0eee5;
  border-radius: 50%;
}

.orbit span:nth-child(2) {
  inset: 15%;
}

.orbit span:nth-child(3) {
  inset: 32%;
  background: #ec422c;
}

.orbit b {
  position: absolute;
  top: 50%;
  left: 50%;
  color: #0b1458;
  font-size: clamp(4rem, 13vw, 11rem);
  font-weight: 900;
  line-height: 0.8;
  transform: translate(-50%, -50%);
}

.under-index {
  position: absolute;
  bottom: -0.16em;
  left: -0.04em;
  color: rgba(240, 238, 229, 0.16);
  font-size: clamp(15rem, 42vw, 38rem);
  line-height: 0.7;
}

.scene {
  position: absolute;
  z-index: 2;
  inset: 0;
  perspective: 1300px;
  perspective-origin: 32% 50%;
  pointer-events: none;
}

.metal-panel {
  position: absolute;
  inset: 0;
  transform: rotateY(calc(var(--turn) * -102deg));
  transform-style: preserve-3d;
  transform-origin: left center;
  pointer-events: auto;
}

.metal-panel.is-snapping {
  transition: transform 720ms cubic-bezier(0.18, 0.74, 0.12, 1);
}

.panel-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  backface-visibility: hidden;
}

.panel-front {
  background-color: #a9afb0;
  background-image: linear-gradient(
    112deg,
    #4e5558 0%,
    #eef0ed 13%,
    #777e80 25%,
    #d9ddda 39%,
    #565d60 52%,
    #f6f7f3 67%,
    #7b8183 82%,
    #d8dcda 100%
  );
  background-position: var(--glint) 50%;
  background-size: 220% 100%;
  box-shadow: 1.2rem 0 3rem rgba(0, 0, 0, 0.45);
}

.panel-front::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.24;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.08) 0,
    rgba(255, 255, 255, 0.08) 1px,
    rgba(0, 0, 0, 0.05) 2px,
    transparent 3px
  );
}

.panel-back {
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.32);
  background: linear-gradient(90deg, #1f2527, #858c8d 45%, #22282a);
  transform: rotateY(180deg);
}

.panel-back span {
  font-size: clamp(3rem, 12vw, 10rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  transform: scaleX(-1);
}

.masthead {
  z-index: 2;
}

.masthead .index {
  font-size: 0.65rem;
}

.masthead h1 {
  font-size: clamp(0.78rem, 1.2vw, 0.98rem);
}

.engraving {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(68vw, 54rem);
  height: min(46vh, 23rem);
  transform: translate(-50%, -50%);
}

.groove {
  position: absolute;
  right: 0;
  left: 0;
  height: clamp(1.6rem, 5vw, 4rem);
  border-top: 1px solid rgba(255, 255, 255, 0.75);
  border-bottom: 1px solid rgba(0, 0, 0, 0.5);
  background: rgba(17, 18, 15, 0.88);
  box-shadow: inset 0 0.5rem 0.8rem rgba(0, 0, 0, 0.5), 0 1px rgba(255, 255, 255, 0.45);
}

.groove-one {
  top: 0;
}

.groove-two {
  top: 50%;
  transform: translateY(-50%);
}

.groove-three {
  bottom: 0;
}

.engraving b {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  color: #ec422c;
  font-size: clamp(5rem, 18vw, 14rem);
  font-weight: 900;
  line-height: 0.75;
  text-shadow: 0 1px rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
}

.edge {
  position: absolute;
  z-index: 3;
  top: 0;
  right: 0;
  bottom: 0;
  width: clamp(3rem, 5vw, 4.5rem);
  padding: 0;
  border: 0;
  border-left: 1px solid rgba(17, 18, 15, 0.75);
  border-radius: 0;
  color: #11120f;
  background: rgba(238, 240, 237, 0.28);
  cursor: ew-resize;
  touch-action: none;
}

.edge span {
  display: block;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transform: rotate(-90deg);
  white-space: nowrap;
}

.edge:hover {
  color: #f0eee5;
  background: #11120f;
}

.edge:focus-visible,
.controls button:focus-visible {
  outline: 3px solid #ec422c;
  outline-offset: -5px;
}

.instruction {
  position: absolute;
  z-index: 4;
  right: clamp(5rem, 8vw, 7rem);
  bottom: clamp(1.25rem, 3.5vw, 3rem);
  color: #11120f;
  line-height: 1.45;
  text-align: right;
  pointer-events: none;
}

.controls {
  position: absolute;
  z-index: 5;
  left: clamp(1.25rem, 3.5vw, 3rem);
  bottom: clamp(1.25rem, 3.5vw, 3rem);
}

.controls button {
  min-width: 7.5rem;
  min-height: 2.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid currentColor;
  border-radius: 0;
  color: #11120f;
  background: rgba(238, 240, 237, 0.56);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}

.controls button:hover {
  color: #f0eee5;
  background: #11120f;
}

.status {
  position: absolute;
  z-index: 5;
  top: clamp(1.25rem, 3.5vw, 3rem);
  right: clamp(5rem, 8vw, 7rem);
}

.stage.is-open .instruction,
.stage.is-open .status,
.stage.is-open .controls button {
  color: #f0eee5;
}

.stage.is-open .controls button {
  background: rgba(10, 53, 200, 0.7);
}

.stage.is-open .instruction {
  display: none;
}

.stage.is-open .status {
  right: auto;
  left: 50%;
  transform: translateX(-50%);
}

.stage.is-hidden .metal-panel {
  transition: none;
}

@media (max-width: 40rem) {
  .stage {
    min-height: 28rem;
  }

  .scene {
    perspective: 800px;
  }

  .orbit {
    left: 50%;
    width: 92vw;
  }

  .engraving {
    width: 74vw;
    height: min(38vh, 17rem);
  }

  .instruction {
    right: 4.4rem;
    bottom: 5rem;
  }

  .status {
    right: 4.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .metal-panel.is-snapping {
    transition: none;
  }
}