* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem;
  background: #111;
  color: #eee;
  font-family: system-ui, sans-serif;
}

main {
  max-width: 960px;
  margin: 0 auto;
}

h1 {
  margin-top: 0;
}

a {
  color: #9fd3ff;
}

.menu {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.menu a {
  display: block;
  padding: 1rem;
  border: 1px solid #444;
  border-radius: 0.75rem;
  background: #1b1b1b;
  text-decoration: none;
}

.stage {
  position: relative;
  width: 640px;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  border: 1px solid #444;
  border-radius: 0.75rem;
  overflow: hidden;
}

canvas,
video {
  width: 100%;
  height: 100%;
  display: block;
}

video {
  display: none;
}

.controls {
  display: grid;
  gap: 0.75rem;
  max-width: 640px;
  margin: 1rem 0;
  padding: 1rem;
  background: #1b1b1b;
  border: 1px solid #333;
  border-radius: 0.75rem;
}

label {
  display: grid;
  gap: 0.25rem;
}

input[type="range"] {
  width: 100%;
}

button {
  width: fit-content;
  padding: 0.6rem 1rem;
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}

.note {
  max-width: 640px;
  color: #bbb;
  line-height: 1.5;
}

.value {
  color: #fff;
  font-weight: 700;
}