html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #10141d;
  color: #f0f4fa;
  font: 14px/1.5 system-ui, sans-serif;
}

#viewport {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 360px;
}

#viewport canvas {
  display: block;
}

.panel {
  position: absolute;
  z-index: 1;
  top: 16px;
  left: 16px;
  width: min(300px, calc(100vw - 64px));
  padding: 16px;
  border: 1px solid #637389;
  border-radius: 12px;
  background: #182232ef;
  box-shadow: 0 12px 32px #0007;
}

h1 {
  margin: 0 0 8px;
  font-size: 18px;
}

p {
  margin: 8px 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

a {
  color: #8ddaff;
}

label {
  display: block;
  margin-top: 12px;
}

select,
input[type='range'] {
  display: block;
  width: 100%;
  margin-top: 4px;
}

.hint {
  color: #c7d5e7;
  font-size: 12px;
}

@media (max-width: 720px) {
  body {
    display: flex;
    flex-direction: column;
    overflow: auto;
  }

  #viewport {
    position: relative;
    inset: auto;
    order: 2;
    flex: 1 0 320px;
    min-height: 320px;
  }

  .panel {
    position: relative;
    top: auto;
    left: auto;
    order: 1;
    width: auto;
    margin: 8px;
    padding: 12px;
  }
}