html, body {
  margin: 0;
  padding: 0;
  background: #111;
  color: #eee;
  font-family: Helvetica, Arial, sans-serif;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 18px 60px;
}

.info {
  text-align: center;
  margin-bottom: 16px;
}

.info h1 {
  margin: 0 0 10px 0;
  font-size: 44px;
  letter-spacing: 0.5px;
}

.info p {
  margin: 0 auto;
  max-width: 720px;
  opacity: 0.9;
  line-height: 1.4;
}

#game-wrap {
  width: 600px;             /* match your createCanvas(600,400) */
  margin: 18px auto 18px;
  position: relative;        /* important: anchors overlay */
  border-radius: 0px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0,0,0,0.55);
  background: #222;
}

/* p5 canvas will be inserted inside sketch-holder */
#sketch-holder canvas {
  display: block;
}

/* overlay layer that sits on top of the canvas */
#ui-layer {
  position: absolute;
  inset: 0;
  pointer-events: none; /* let mouse go to canvas unless an element opts-in */
}

/* helper class for clickable overlay elements */
.ui-clickable {
  pointer-events: auto;
}

.below {
  max-width: 720px;
  margin: 0 auto;
  opacity: 0.9;
}

.howto-title {
  font-weight: 700;
  margin: 14px 0 6px 0;
}

#settings-panel {
  width: 600px;              /* match your canvas */
  margin: 12px auto 16px;
  padding: 12px 14px;
  border-radius: 14px;
  background: #1a1a1a;
  color: #eee;
  font-family: Helvetica, Arial, sans-serif;
  box-shadow: 0 10px 28px rgba(0,0,0,0.45);
}
.setting-row {
  display: grid;
  grid-template-columns: 160px 1fr 90px;
  gap: 10px;
  align-items: center;
  margin: 8px 0;
}

.setting-label {
  opacity: 0.95;
  user-select: none;
}

.setting-row input[type="range"] {
  width: 100%;
}

.setting-row {
  grid-template-columns: 160px 220px 90px;
}

.setting-row input[type="number"] {
  width: 90px;
  padding: 6px 8px;
  border-radius: 10px;
  border: 1px solid #333;
  background: #111;
  color: #eee;
}

#stereoIODRange {
  width: 70%;
}

#stereoIODRange {
  width: 220px;
}

/* Make the checkbox row not use the 3-column layout */
.setting-row:first-child {
  grid-template-columns: 1fr;
}