:root {
  color-scheme: dark;
  font-family: Tahoma, "Noto Sans Thai", Arial, sans-serif;
  background: #0b1020;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: radial-gradient(circle at 50% 35%, #20345f 0, #0b1020 62%, #050812 100%);
}

body {
  display: grid;
  place-items: center;
  padding: max(8px, env(safe-area-inset-top)) max(8px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
}

.game-shell {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
}

.canvas-frame {
  position: relative;
  width: min(100%, 960px, calc((100vh - 16px) * 1.5));
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: #000;
  border-radius: 8px;
  box-shadow: 0 18px 60px rgb(0 0 0 / 52%);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: auto;
  background: #000;
  outline: none;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
}

canvas:focus-visible { box-shadow: inset 0 0 0 4px rgb(255 255 255 / 75%); }

.input-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.answer-input {
  position: absolute;
  z-index: 2;
  display: none;
  height: 9.5%;
  padding: 0 1%;
  border: 0;
  border-radius: 8px;
  outline: none;
  color: #2b1f11;
  background: transparent;
  font: 700 clamp(24px, 6vw, 48px)/1 Tahoma, Arial, sans-serif;
  text-align: center;
  pointer-events: auto;
  caret-color: #0b5ca8;
}

.answer-input:focus { box-shadow: inset 0 0 0 4px rgb(11 92 168 / 48%); }

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 12px;
  color: #fff;
  background: #0b1020;
  font-size: clamp(16px, 2vw, 24px);
  transition: opacity 180ms ease;
}

.loading small { color: #bdc9e6; font-size: 0.65em; }
.loading.is-hidden { pointer-events: none; opacity: 0; }

.spinner {
  width: 42px;
  height: 42px;
  border: 5px solid rgb(255 255 255 / 22%);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

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

@keyframes spin { to { transform: rotate(360deg); } }

@media (max-aspect-ratio: 3 / 2) {
  .canvas-frame { width: min(100%, 960px); height: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 1.8s; }
}