:root {
  color-scheme: dark;
  --bg: #020610;
  --panel: rgba(7, 14, 31, 0.72);
  --panel-border: rgba(167, 210, 255, 0.2);
  --text: #f4f8ff;
  --muted: #a9b8cf;
  --cyan: #6de8ff;
  --cyan-strong: #22c9f2;
  --amber: #ffc36d;
  --danger: #ff9b9b;
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 62% 42%, rgba(22, 58, 117, 0.25), transparent 36%),
    radial-gradient(circle at 20% 78%, rgba(48, 30, 105, 0.2), transparent 42%),
    var(--bg);
}

body {
  color: var(--text);
}

button {
  font: inherit;
}

#scene-canvas {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
}

.glass-panel {
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(145deg, rgba(15, 28, 55, 0.8), rgba(4, 9, 22, 0.66)),
    var(--panel);
  box-shadow:
    0 22px 70px rgba(0, 0, 0, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.help-panel {
  position: fixed;
  z-index: 10;
  top: clamp(16px, 3vw, 34px);
  left: clamp(16px, 3vw, 34px);
  width: min(370px, calc(100vw - 32px));
  padding: 24px;
  border-radius: 22px;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 0.67rem;
  font-weight: 760;
  letter-spacing: 0.22em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 650;
  letter-spacing: -0.055em;
  line-height: 1;
}

h1 span {
  display: inline-block;
  margin-left: 0.12em;
  color: var(--amber);
  font-size: 0.48em;
  font-weight: 750;
  letter-spacing: 0.08em;
  vertical-align: 0.43em;
}

.lead {
  max-width: 29ch;
  margin: 14px 0 19px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.75;
}

.control-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  margin: 0;
}

.control-list div {
  min-width: 0;
  padding: 10px 8px 9px;
  border: 1px solid rgba(164, 210, 255, 0.12);
  border-radius: 12px;
  background: rgba(109, 232, 255, 0.045);
  text-align: center;
}

.control-list dt {
  margin-bottom: 4px;
  color: var(--cyan);
  font-size: 0.61rem;
  font-weight: 740;
  letter-spacing: 0.12em;
}

.control-list dd {
  margin: 0;
  color: #eaf3ff;
  font-size: 0.65rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

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

.scale-note {
  margin: 15px 2px 0;
  color: #7f91ab;
  font-size: 0.68rem;
  line-height: 1.55;
}

.xr-launch {
  position: fixed;
  z-index: 12;
  bottom: max(22px, env(safe-area-inset-bottom));
  left: 50%;
  display: grid;
  width: min(390px, calc(100vw - 32px));
  justify-items: center;
  transform: translateX(-50%);
  transition: opacity 180ms ease;
}

#ar-button,
#xr-exit {
  min-width: 168px;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid rgba(154, 235, 255, 0.54);
  border-radius: 999px;
  color: #021119;
  background: linear-gradient(135deg, #a7f3ff, #4dd8f5 58%, #6db9ff);
  box-shadow:
    0 12px 34px rgba(27, 189, 231, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  font-size: 0.86rem;
  font-weight: 780;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    transform 150ms ease,
    box-shadow 150ms ease,
    opacity 150ms ease;
}

#ar-button:not(:disabled):hover,
#xr-exit:hover {
  transform: translateY(-2px);
  box-shadow:
    0 16px 42px rgba(27, 189, 231, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

#ar-button:not(:disabled):active,
#xr-exit:active {
  transform: translateY(0);
}

#ar-button:focus-visible,
#xr-exit:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.92);
  outline-offset: 4px;
}

#ar-button:disabled {
  border-color: rgba(173, 191, 217, 0.25);
  color: #9faec2;
  background: rgba(24, 34, 52, 0.86);
  box-shadow: none;
  cursor: not-allowed;
}

#ar-button.is-unavailable {
  color: #c5cfde;
}

#xr-status {
  max-width: 100%;
  margin: 9px 0 0;
  padding: 7px 12px;
  border: 1px solid rgba(171, 204, 244, 0.12);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(2, 7, 17, 0.72);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.24);
  font-size: 0.69rem;
  line-height: 1.35;
  text-align: center;
}

#xr-status.is-error {
  color: var(--danger);
}

.xr-overlay {
  position: fixed;
  z-index: 30;
  inset: 0;
  display: grid;
  padding:
    max(18px, env(safe-area-inset-top))
    max(18px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom))
    max(18px, env(safe-area-inset-left));
  align-content: space-between;
  justify-items: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

body.xr-active .xr-overlay {
  opacity: 1;
  visibility: visible;
}

.xr-overlay__guide {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 10px 12px;
  border: 1px solid rgba(182, 226, 255, 0.25);
  border-radius: 15px;
  color: white;
  background: rgba(2, 8, 18, 0.62);
  font-size: 0.73rem;
  line-height: 1.4;
  text-shadow: 0 1px 8px black;
}

.xr-overlay__guide span + span::before {
  margin-right: 8px;
  color: rgba(255, 255, 255, 0.35);
  content: "•";
}

#xr-scale {
  min-width: 52px;
  color: var(--amber);
  text-align: center;
}

#xr-exit {
  min-width: 130px;
  min-height: 42px;
  padding: 9px 18px;
  color: white;
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(4, 10, 22, 0.7);
  box-shadow: 0 9px 26px rgba(0, 0, 0, 0.32);
  pointer-events: auto;
}

body.xr-active .help-panel,
body.xr-active .xr-launch {
  opacity: 0;
  pointer-events: none;
}

.no-script {
  position: fixed;
  z-index: 100;
  inset: 50% auto auto 50%;
  width: min(420px, calc(100vw - 32px));
  margin: 0;
  padding: 20px;
  border-radius: 16px;
  color: white;
  background: #121a2c;
  transform: translate(-50%, -50%);
  text-align: center;
}

@media (max-width: 640px) {
  .help-panel {
    top: 12px;
    left: 12px;
    width: min(322px, calc(100vw - 24px));
    padding: 18px;
    border-radius: 18px;
  }

  .lead {
    margin: 10px 0 14px;
    font-size: 0.8rem;
  }

  .control-list div {
    padding: 8px 5px;
  }

  .scale-note {
    margin-top: 11px;
  }

  .xr-launch {
    bottom: max(14px, env(safe-area-inset-bottom));
  }

  #xr-status {
    font-size: 0.64rem;
  }
}

@media (max-height: 600px) and (orientation: landscape) {
  .help-panel {
    width: 300px;
    padding: 15px 17px;
  }

  .lead,
  .scale-note {
    display: none;
  }

  .control-list {
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}