:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #101214;
  color: #f5f7f8;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --surface: rgba(22, 26, 30, 0.94);
  --surface-strong: #181c20;
  --border: rgba(255, 255, 255, 0.15);
  --muted: #b3bbc2;
  --accent: #f5f7f8;
  --accent-text: #101214;
  --success: #8bd6aa;
  --warning: #ffd479;
  --danger: #ff9b9b;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background: #101214;
}

html.is-ar-active,
html.is-ar-active body,
body:xr-overlay {
  background: transparent;
}

button {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.scene-root {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: #101214;
  opacity: 0;
  transition: opacity 180ms ease;
}

.scene-root.is-active {
  opacity: 1;
}

html.is-ar-active .scene-root,
body:xr-overlay .scene-root {
  background: transparent;
  transition: none;
}

.webgl-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

html.is-ar-active .webgl-canvas,
body:xr-overlay .webgl-canvas {
  background: transparent;
}

.app-shell {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.screen,
.fatal-error {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding:
    max(24px, env(safe-area-inset-top))
    max(20px, env(safe-area-inset-right))
    max(24px, env(safe-area-inset-bottom))
    max(20px, env(safe-area-inset-left));
  background: #101214;
  pointer-events: auto;
}

.panel {
  width: min(100%, 560px);
  padding: clamp(24px, 5vw, 44px);
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
}

.panel-compact {
  width: min(100%, 440px);
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 12px;
}

.lead {
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.button,
.icon-button,
.text-button {
  min-height: 46px;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, opacity 140ms ease, transform 140ms ease;
}

.button {
  padding: 12px 18px;
  font-weight: 750;
}

.button-primary {
  background: var(--accent);
  color: var(--accent-text);
}

.button-secondary {
  border: 1px solid var(--border);
  background: transparent;
  color: #f5f7f8;
}

.button:hover:not(:disabled),
.icon-button:hover,
.text-button:hover {
  transform: translateY(-1px);
}

.button:focus-visible,
.icon-button:focus-visible,
.text-button:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.32);
  outline-offset: 3px;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.compatibility-message {
  min-height: 42px;
  margin: 18px 0 4px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.text-button {
  min-height: 36px;
  padding: 6px 0;
  background: transparent;
  color: #dbe1e5;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.game-hud {
  position: absolute;
  inset: 0;
  padding:
    max(16px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(20px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}

.hud-top {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 16px;
  align-items: center;
  width: min(100%, 620px);
  margin: 0 auto;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(16, 18, 20, 0.86);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(12px);
  pointer-events: auto;
}

.hud-label {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hud-value {
  display: block;
  margin-top: 2px;
  font-size: 1.45rem;
}

.hud-progress {
  color: #e6ebee;
  font-variant-numeric: tabular-nums;
}

.icon-button {
  min-height: 38px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #f5f7f8;
}

.game-instruction {
  position: absolute;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  left: max(16px, env(safe-area-inset-left));
  width: fit-content;
  max-width: min(92vw, 560px);
  margin: 0 auto;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(16, 18, 20, 0.86);
  color: #f5f7f8;
  text-align: center;
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(12px);
}

.completion-panel {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(8, 10, 12, 0.52);
  pointer-events: auto;
}

.diagnostics-panel {
  position: absolute;
  top: max(12px, env(safe-area-inset-top));
  right: max(12px, env(safe-area-inset-right));
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 5;
  width: min(420px, calc(100vw - 24px));
  padding: 20px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(18, 22, 25, 0.97);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
}

.diagnostics-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
}

.diagnostics-list {
  margin: 18px 0;
}

.diagnostics-list > div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.diagnostics-list dt {
  color: var(--muted);
}

.diagnostics-list dd {
  margin: 0;
  text-align: right;
}

[data-status="ok"] {
  color: var(--success);
}

[data-status="warning"],
[data-status="pending"] {
  color: var(--warning);
}

[data-status="error"] {
  color: var(--danger);
}

.diagnostics-details {
  margin: 0;
  padding: 12px;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  border-radius: 10px;
  background: #0b0d0f;
  color: #c7cfd5;
  font-size: 0.75rem;
  line-height: 1.5;
}

.toast {
  position: absolute;
  top: 104px;
  left: 50%;
  z-index: 4;
  max-width: min(90vw, 480px);
  padding: 10px 16px;
  border: 1px solid rgba(255, 212, 121, 0.42);
  border-radius: 10px;
  background: rgba(24, 28, 32, 0.96);
  color: var(--warning);
  text-align: center;
  transform: translateX(-50%);
}

.fatal-error {
  z-index: 10;
}

noscript {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #101214;
  color: #fff;
}

@media (max-width: 560px) {
  .actions {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 24px;
  }

  .hud-top {
    grid-template-columns: 1fr auto auto;
    gap: 10px;
  }

  .hud-progress {
    font-size: 0.88rem;
  }
}

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