*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  min-height: 100%;
  background:
    radial-gradient(circle at 16% 12%, rgba(255, 237, 116, 0.85), transparent 22rem),
    radial-gradient(circle at 86% 8%, rgba(119, 213, 255, 0.75), transparent 20rem),
    linear-gradient(160deg, #dff8ff 0%, #aeead0 48%, #f6f1b8 100%);
  font-family: "Comic Sans MS", "Trebuchet MS", "Pretendard", "Apple SD Gothic Neo",
    sans-serif;
  color: #123047;
  display: flex;
  justify-content: center;
  align-items: stretch;
}

body {
  padding: 16px 12px;
}

.page {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  line-height: 1;
  color: #d83333;
  text-shadow: 0 3px 0 #fff3c4;
}

.subtitle {
  margin: 8px 0 12px;
  font-size: 1.08rem;
  font-weight: 800;
  color: #195374;
}

#game-canvas {
  width: min(980px, 96vw);
  max-width: 960px;
  aspect-ratio: 16 / 9;
  border: 8px solid #fff4b7;
  border-radius: 18px;
  box-shadow: 0 18px 38px rgba(35, 84, 74, 0.26), inset 0 0 0 4px #38a9ff;
  background: #81d4fa;
  touch-action: none;
}

.controls {
  display: inline-block;
  max-width: min(92vw, 760px);
  margin-top: 12px;
  margin-bottom: 0;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  font-size: 1rem;
  line-height: 1.35;
  font-weight: 900;
  color: #173047;
  box-shadow: 0 6px 18px rgba(48, 116, 96, 0.12);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}