:root { color-scheme: light dark; font: 16px/1.55 system-ui,sans-serif; }
  body { margin: 0; }
  main { max-width: 56rem; margin: auto; padding: 2rem clamp(1rem,4vw,3rem); }
  header { display: flex; justify-content: space-between; gap: 1rem; align-items: center;
    border-bottom: 1px solid GrayText; padding-bottom: 1rem; margin-bottom: 2rem; }
  header a { color: inherit; font-weight: 700; text-decoration: none; }
  header span { font-size: .8rem; letter-spacing: .12em; }
  section { border-top: 1px solid GrayText; padding-top: .75rem; margin-top: 2rem; }
  form { display: flex; flex-wrap: wrap; gap: .65rem; align-items: end; margin: .8rem 0; }
  label { display: grid; gap: .25rem; }
  input, button { font: inherit; border: 1px solid GrayText; border-radius: .35rem; padding: .45rem .7rem; }
  button { min-height: 44px; background: #006b62; color: white; border-color: #006b62; cursor: pointer; }
  button.secondary { background: Canvas; color: CanvasText; border-color: GrayText; }
  a:focus-visible, input:focus-visible, button:focus-visible { outline: 2px solid #008b80; outline-offset: 3px; }
  code { overflow-wrap: anywhere; }
  .pair { font: 700 2rem ui-monospace,monospace; letter-spacing: .14em; display: block; }
  li { margin-block: .6rem; }
  ul.devices, ul.clients { padding: 0; list-style: none; }
  .devices li, .clients li { border: 1px solid GrayText; border-radius: .5rem; padding: .85rem 1rem; }