* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 15%, rgba(74, 144, 226, 0.28), transparent 28%),
    radial-gradient(circle at 80% 85%, rgba(255, 193, 7, 0.18), transparent 30%),
    #111821;
  color: #eef4ff;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(100%, 1040px);
}

.game-panel {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(12, 18, 26, 0.86);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
}

.hud,
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
}

.hud {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0;
}

p {
  margin: 4px 0 0;
  color: #b9c6d8;
}

.scoreboard {
  min-width: 96px;
  text-align: right;
}

.scoreboard span,
.controls {
  color: #b9c6d8;
  font-size: 0.95rem;
}

.scoreboard strong {
  display: block;
  color: #ffd166;
  font-size: 2rem;
  line-height: 1;
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #17212d;
}

.controls {
  flex-wrap: wrap;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  .hud {
    align-items: flex-start;
  }
}