:root {
  --bg: #0d4ea6;
  --panel: #0a3f86;
  --text: #f3f8ff;
  --wall: #ffffff;
  --accent: #ffef5a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Courier New", Courier, monospace;
  background: radial-gradient(circle at top, #1c66ca, var(--bg));
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app {
  width: min(94vw, 760px);
  padding: 1rem;
}

h1 {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hud {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.4rem 1rem;
  background: var(--panel);
  border: 3px solid var(--wall);
  padding: 0.6rem;
  margin-bottom: 0.8rem;
}

canvas {
  width: 100%;
  max-width: 640px;
  display: block;
  border: 8px solid var(--wall);
  background: #0f58b8;
  image-rendering: pixelated;
}

.instructions {
  margin-top: 0.8rem;
  background: var(--panel);
  border: 3px solid var(--wall);
  padding: 0.6rem;
}

.mobile-controls {
  display: none;
  margin-top: 0.8rem;
  gap: 0.5rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    ". up ."
    "left . right"
    ". down .";
  touch-action: none;
}

.mobile-controls .pad {
  margin: 0;
  padding: 0.8rem 0;
  min-height: 56px;
  font-size: 1.25rem;
  font-weight: 700;
}

.mobile-controls .up { grid-area: up; }
.mobile-controls .left { grid-area: left; }
.mobile-controls .right { grid-area: right; }
.mobile-controls .down { grid-area: down; }

.instructions p {
  margin: 0.2rem 0;
}

button {
  margin-top: 0.5rem;
  font: inherit;
  color: #071d43;
  background: var(--accent);
  border: 2px solid #fff6ae;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

@media (max-width: 640px) {
  .hud {
    grid-template-columns: 1fr;
  }

  .mobile-controls {
    display: grid;
  }
}