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

body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: #1a1a1a;
  background: #fff;
}

#interaction-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background: #f0f0f0;
  border-bottom: 1px solid #ddd;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 1.5rem;
  touch-action: none;
}

.readout-group {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
}

.readout-label {
  font-size: 11px;
  text-transform: uppercase;
  color: #999;
  letter-spacing: 0.05em;
}

.readout-value {
  font-family: ui-monospace, monospace;
  font-size: 20px;
  color: #1a1a1a;
  min-width: 3.5ch;
}

#content {
  max-width: 680px;
  margin: 0 auto;
  padding: 92px 1.25rem 2rem;
}

#content p + p {
  margin-top: 1.25em;
}