:root {
  --bg: #0b172a;
  --panel: #102440;
  --text: #f0f4ff;
  --accent: #4cc9f0;
  --danger: #ef476f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Verdana", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #183b64 0%, #0b172a 55%, #070d17 100%);
  display: grid;
  place-items: center;
  padding: 16px;
}

.app {
  width: min(100%, 460px);
  background: rgba(16, 36, 64, 0.92);
  border: 1px solid #2d507f;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  position: relative;
}

h1 {
  margin: 0;
  font-size: 2rem;
}

.subtitle {
  margin-top: 8px;
  opacity: 0.9;
}

.hud {
  margin: 12px 0;
  display: flex;
  justify-content: space-around;
  font-weight: 700;
}

canvas {
  width: 100%;
  max-width: 420px;
  border: 2px solid #40689e;
  border-radius: 10px;
  background: linear-gradient(to bottom, #081424, #0b2138 60%, #0d2a44);
  display: block;
  margin-inline: auto;
}

.controls {
  margin-top: 12px;
  font-size: 0.9rem;
  opacity: 0.95;
}

.touch-controls {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

button {
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #042130;
  font-size: 1rem;
  font-weight: 700;
  padding: 12px;
  cursor: pointer;
}

button:active {
  transform: translateY(1px);
}

.game-over {
  position: absolute;
  inset: 0;
  background: rgba(11, 23, 42, 0.9);
  border-radius: 12px;
  display: grid;
  place-content: center;
  gap: 14px;
  padding: 20px;
}

#gameOverText {
  color: var(--danger);
  font-size: 1.3rem;
  margin: 0;
  font-weight: 700;
}

.hidden {
  display: none;
}

@media (min-width: 700px) {
  .touch-controls {
    display: none;
  }
}