:root {
  --bg-top: #89c2ff;
  --bg-bottom: #e9f8ff;
  --ink: #1f2a44;
  --panel: #ffffffcc;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body {
  display: grid;
  place-items: center;
  gap: 12px;
  padding: 12px;
}

.hud {
  width: min(960px, 100%);
  background: var(--panel);
  border-radius: 12px;
  padding: 10px 14px;
  box-shadow: 0 6px 24px #0f2a4f22;
}

.hud h1 {
  margin: 0;
  font-size: 1.2rem;
}

.hud p {
  margin: 6px 0 0;
  font-size: 0.92rem;
}

#game {
  width: min(960px, 100%);
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px #0f2a4f33;
  touch-action: none;
}

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

@media (max-width: 900px) {
  html,
  body {
    width: 100%;
    height: var(--app-height, 100dvh);
  }

  body {
    display: block;
    padding: 0;
    overflow: hidden;
    background: #89c2ff;
  }

  .hud {
    display: none;
  }

  #game {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: var(--app-height, 100dvh);
    aspect-ratio: auto;
    border-radius: 0;
    box-shadow: none;
  }
}