*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #fafafa;
  overflow: hidden;
  flex-direction: column;
}

#canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

#keyboard {
  position: fixed;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 10;
}

.key {
  width: 3rem;
  height: 3rem;
  border-radius: 0.5rem;
  border: 2px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.08s, border-color 0.2s, background 0.2s, box-shadow 0.2s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.key.active {
  transform: scale(0.9);
  border-color: var(--key-color, #fff);
  background: var(--key-bg, rgba(255,255,255,0.2));
  box-shadow: 0 0 20px var(--key-color, #fff);
}

.label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.6);
  pointer-events: none;
}

#hint {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.25);
  z-index: 10;
  white-space: nowrap;
}

@media (max-width: 500px) {
  .key { width: 2.2rem; height: 2.2rem; }
  .label { font-size: 0.65rem; }
}