:root {
  --glass-bg: rgba(255,255,255,0.25);
  --glass-border: rgba(255,255,255,0.35);
  --text: #16181a;
  --text-inverse: #ffffff;
  --accent: #37a6ff;
}
html, body {
  height: 100%;
}
body {
  margin: 0;
  background: linear-gradient(180deg, #7dd3fc 0%, #dff6ff 100%);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  overflow: hidden;
  color: var(--text);
}
body.turbo {
  /* Slightly darker to hide scaling artifacts at very low DPR */
  background: #0a0f1a;
}
#settingsModal .label-strong { min-width: 110px; font-weight: 600; }
#settingsModal .flex-label { display:flex; align-items:center; gap:8px; }
#settingsModal .tip { opacity: 0.9; font-size: 13px; }
#game {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
  cursor: pointer;
  outline: none;
  image-rendering: pixelated;
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.hud {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: calc(12px + env(safe-area-inset-right));
  left: auto;
  transform: none;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 10;
  pointer-events: none;
}
.hud .btn {
  pointer-events: auto;
  -webkit-tap-highlight-color: transparent;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 12px;
  font-size: 16px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.35);
  backdrop-filter: saturate(1.2) blur(6px);
  cursor: pointer;
  user-select: none;
}
body.turbo .hud .btn { backdrop-filter: none; box-shadow: 0 2px 6px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.25); }
.hud .btn:active { transform: translateX(0) scale(0.98); }
.hud .btn[aria-pressed="true"] {
  background: rgba(55,166,255,0.22);
  border-color: rgba(55,166,255,0.45);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: calc(16px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom)) 16px;
}
.modal-backdrop.open { display: flex; }
.modal {
  width: min(480px, 92vw);
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  backdrop-filter: saturate(1.2) blur(10px);
  color: #0b0e11;
}
body.turbo .modal { backdrop-filter: none; }
.modal header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  font-weight: 700;
}
.modal .content { padding: 12px 16px 16px; }
.row { display: flex; align-items: center; gap: 12px; margin: 10px 0; flex-wrap: wrap; }
.segmented {
  display: inline-flex;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  border-radius: 12px;
  overflow: hidden;
}
.segmented button {
  border: none;
  padding: 8px 12px;
  background: transparent;
  cursor: pointer;
}
.segmented button.active { background: rgba(55,166,255,0.25); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(16px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 10px 12px;
  display: none;
  align-items: center;
  gap: 10px;
  z-index: 30;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  backdrop-filter: saturate(1.2) blur(8px);
}
body.turbo .toast { backdrop-filter: none; box-shadow: 0 6px 18px rgba(0,0,0,0.12); }
.toast.open { display: inline-flex; }
.toast .action {
  background: rgba(55,166,255,0.22);
  border: 1px solid rgba(55,166,255,0.45);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 10px;
  cursor: pointer;
}

[hidden] { display: none !important; }

/* High-contrast UI variant */
body.hc .hud .btn {
  background: rgba(255,255,255,0.92);
  border-color: rgba(0,0,0,0.35);
  box-shadow: 0 2px 10px rgba(0,0,0,0.12), inset 0 1px 0 rgba(255,255,255,0.9);
}
body.hc .modal {
  background: rgba(255,255,255,0.96);
  border-color: rgba(0,0,0,0.1);
}
body.hc .toast {
  background: rgba(20,20,20,0.86);
  color: #fff;
  border-color: rgba(255,255,255,0.2);
}

/* Fallback help text for non-canvas environments */
noscript {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: #222;
  color: white;
  z-index: 1000;
}

/* Visible focus for keyboard users */
.hud .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }