*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: #000;
  font-family: 'Courier New', monospace;
}

canvas {
  display: block;
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
}

#hud {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 10;
}

#vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 45%, rgba(0,0,0,0.75) 100%);
}

#theme-label {
  position: absolute;
  top: 1.4rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.78rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  text-shadow: 0 0 18px rgba(255,255,255,0.9);
  white-space: nowrap;
}

/* ── Audio controls ──────────────────────────────────────────────────────── */
#audio-controls {
  position: absolute;
  bottom: 1.4rem;
  left: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  pointer-events: auto;
}

#sound-toggle {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.18);
  color: rgba(255,255,255,0.38);
  font-family: 'Courier New', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 0.28rem 0.7rem;
  cursor: pointer;
  transition: background 0.25s, border-color 0.25s, color 0.25s, text-shadow 0.25s;
}
#sound-toggle:hover {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.65);
}
#sound-toggle.on {
  background: rgba(0,255,200,0.1);
  border-color: rgba(0,255,200,0.38);
  color: rgba(0,255,200,0.85);
  text-shadow: 0 0 10px rgba(0,255,200,0.5);
}

#bpm-control {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  opacity: 0.22;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
#bpm-control.active {
  opacity: 1;
  pointer-events: auto;
}

#bpm-label {
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
}

#bpm-slider {
  width: min(128px, 22vw);
  cursor: pointer;
  accent-color: rgba(0,255,200,0.85);
}