:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #0a0a0a;
  color: #8cff9a;
  font-family: "IBM Plex Mono", "Courier New", monospace;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
}

.header {
  text-align: center;
  max-width: 52rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header p {
  margin: 0;
  color: #5fd67a;
  font-size: 0.9rem;
  line-height: 1.5;
}

kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border: 1px solid #2d6b3c;
  border-radius: 0.2rem;
  background: #102016;
  color: #b8ffd0;
  font-size: 0.85em;
}

.game-shell {
  border: 1px solid #1f5f31;
  box-shadow: 0 0 24px rgba(32, 255, 100, 0.08);
  background: #000;
}

canvas {
  display: block;
  width: 800px;
  height: 600px;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - 8rem);
}