:root {
    --paper: #ece9e3; --ink: #2a2724; --muted: #8d877e; --line: #d6d0c6;
    --card: rgba(249, 247, 243, .84); --serif: 'Instrument Serif', Georgia, serif;
    --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; height: 100%; overflow: hidden; background: var(--paper); color: var(--ink); font-family: var(--sans); }
  canvas { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; }
  canvas.grabbing { cursor: grabbing; }
  .vignette { position: fixed; inset: 0; pointer-events: none;
    background: radial-gradient(ellipse 75% 70% at 50% 46%, transparent 55%, rgba(110, 98, 80, .14) 100%); }
  .ui { position: fixed; z-index: 2; }
  .kicker { font-size: 9.5px; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
  .kicker a { color: inherit; text-decoration: none; border-bottom: 1px solid var(--line); }
  .kicker a:hover { color: var(--ink); }

  .intro { top: 22px; left: 26px; pointer-events: none; }
  .intro a { pointer-events: auto; }
  .intro h1 { margin: 10px 0 12px; font: italic 400 58px/0.86 var(--serif); letter-spacing: -.01em; }
  .intro h1 span { display: block; padding-left: 1.05em; }
  .intro p { margin: 0; max-width: 210px; font: 400 14px/1.35 var(--serif); color: var(--soft); }

  .hud { top: 18px; right: 26px; font-size: 9.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted);
    font-variant-numeric: tabular-nums; text-align: right; }
  .hud b { color: var(--ink); font-weight: 600; }
  .live { display: inline-block; margin-top: 6px; padding: 3px 7px; border: 1px solid var(--line); border-radius: 2px; }
  .live::before { content: ''; display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: #3aa76d;
    margin-right: 5px; vertical-align: 1px; animation: blink 2s infinite; }
  @keyframes blink { 50% { opacity: .25; } }

  .panel { top: 66px; right: 26px; width: 236px; padding: 14px 16px 16px; background: var(--card); border: 1px solid var(--line);
    border-radius: 3px; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); box-shadow: 0 6px 30px rgba(80, 70, 50, .07); }
  .row { display: flex; justify-content: space-between; align-items: baseline; }
  .fig { font: italic 13px var(--serif); color: var(--muted); }
  .sect { margin-top: 14px; }
  .swatches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 8px; }
  .sw { appearance: none; background: none; border: 1px solid transparent; border-radius: 2px; padding: 6px 4px 4px; cursor: pointer;
    font: italic 12px var(--serif); color: var(--muted); display: grid; gap: 5px; justify-items: center; }
  .sw i { display: block; width: 100%; height: 13px; border-radius: 1px; }
  .sw[aria-pressed="true"] { border-color: var(--ink); color: var(--ink); background: rgba(255, 255, 255, .55); }
  .val { font-size: 10px; font-weight: 600; font-variant-numeric: tabular-nums; }
  input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; margin: 9px 0 3px; background: transparent; height: 14px; }
  input[type=range]::-webkit-slider-runnable-track { height: 1px; background: #b9b2a7; }
  input[type=range]::-moz-range-track { height: 1px; background: #b9b2a7; }
  input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 11px; height: 11px; border-radius: 50%; margin-top: -5px;
    background: var(--paper); border: 1px solid var(--ink); cursor: pointer; }
  input[type=range]::-moz-range-thumb { width: 10px; height: 10px; border-radius: 50%; background: var(--paper); border: 1px solid var(--ink); }
  .ends { display: flex; justify-content: space-between; font: italic 11.5px var(--serif); color: var(--muted); }
  .btns { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 16px; }
  .btn { appearance: none; border: 1px solid #bfb8ad; background: rgba(255, 255, 255, .4); color: var(--ink); border-radius: 2px;
    padding: 8px 6px; font: 500 11.5px var(--sans); cursor: pointer; transition: background .15s, border-color .15s; }
  .btn:hover { border-color: var(--ink); }
  .btn.primary { background: var(--ink); border-color: var(--ink); color: #f4f1eb; }
  .btn.primary:hover { background: #000; }
  .btn:active { transform: translateY(1px); }
  .checks { display: flex; gap: 14px; margin: 12px 0 2px; font-size: 11px; color: var(--soft); }
  .checks label { display: flex; align-items: center; gap: 5px; cursor: pointer; }
  .checks input { margin: 0; accent-color: var(--ink); }

  .foot { left: 26px; bottom: 22px; width: 300px; }
  .handle { margin: 0 0 12px; font: 400 13px/1.35 var(--serif); color: var(--soft); }
  .handle em { font-style: normal; }
  .stats { display: grid; grid-template-columns: repeat(4, auto); justify-content: start; border-top: 1px solid var(--line); }
  .stat { padding: 7px 18px 7px 0; margin-right: 12px; border-right: 1px solid var(--line); }
  .stat:last-child { border-right: 0; }
  .stat .k { font-size: 8.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
  .stat .v { margin-top: 3px; font: 400 21px var(--serif); font-variant-numeric: tabular-nums; white-space: nowrap; }
  .stat .v small { font-size: 11px; color: var(--muted); font-family: var(--sans); margin-left: 2px; }
  .note { margin: 8px 0 0; font-size: 9.5px; line-height: 1.45; color: #a29b90; max-width: 290px; }

  .inside { right: 26px; bottom: 22px; width: 236px; background: var(--card); border: 1px solid var(--line); border-radius: 3px;
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
  .inside summary { list-style: none; cursor: pointer; padding: 10px 14px; display: flex; justify-content: space-between; }
  .inside summary::-webkit-details-marker { display: none; }
  .inside summary::after { content: '›'; transition: transform .2s; }
  .inside[open] summary::after { transform: rotate(90deg); }
  .inside div { padding: 0 14px 14px; font: 400 13px/1.4 var(--serif); color: var(--soft); }
  .inside div p { margin: 0 0 8px; }

  .hint { left: 50%; bottom: 24px; transform: translateX(-50%); font: italic 15px var(--serif); color: var(--muted);
    pointer-events: none; transition: opacity .8s; }
  .hint.gone { opacity: 0; }

  @media (max-width: 760px) {
    .intro { top: 14px; left: 16px; }
    .intro h1 { font-size: 38px; margin: 6px 0 0; }
    .intro p, .handle, .note, .inside, .hint { display: none; }
    .hud { top: 14px; right: 16px; }
    .hud .meta { display: none; }
    .foot { left: 16px; top: 112px; bottom: auto; width: auto; }
    .stats { border-top: 0; grid-template-columns: repeat(2, auto); }
    .stat { padding: 4px 12px 4px 0; margin-right: 8px; border-right: 0; }
    .stat .v { font-size: 17px; }
    .panel { top: auto; bottom: max(12px, env(safe-area-inset-bottom)); left: 12px; right: 12px; width: auto; padding: 10px 12px 12px;
      display: grid; grid-template-columns: 1fr 1fr; column-gap: 14px; }
    .panel .head { display: none; }
    .panel .sect { margin-top: 6px; }
    .panel .colour { grid-column: 1 / -1; }
    .swatches { margin-top: 4px; }
    .btns { margin-top: 8px; }
    .checks { grid-column: 1 / -1; margin: 6px 0 0; }
    .panel .btns.b1 { grid-column: 1; } .panel .btns.b2 { grid-column: 2; }
  }

  /* lab additions */
  :root { --soft: #5a554e; --btn: rgba(255, 255, 255, .4); --btnLine: #bfb8ad; --track: #b9b2a7; --onInk: #f4f1eb; }
  body.dark { --paper: #1d1a1f; --ink: #ece6dc; --muted: #8f877d; --line: #3a353b; --soft: #b9b0a4;
    --card: rgba(33, 30, 35, .82); --btn: rgba(255, 255, 255, .04); --btnLine: #4a444b; --track: #5b545b; --onInk: #1d1a1f; }
  .btn { background: var(--btn); border-color: var(--btnLine); }
  .btn.primary { color: var(--onInk); }
  .btn.on { background: var(--ink); color: var(--onInk); border-color: var(--ink); }
  input[type=range]::-webkit-slider-runnable-track { background: var(--track); }
  input[type=range]::-moz-range-track { background: var(--track); }
  .btns.three { grid-template-columns: 1fr 1fr 1fr; }
  .seg { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 8px; }
  .sw[aria-pressed="true"] { background: var(--btn); }
  .keys { margin-top: 6px; font-size: 10px; color: var(--muted); letter-spacing: .04em; }
  .keys kbd { font: 600 9.5px var(--sans); border: 1px solid var(--line); border-radius: 2px; padding: 0 4px; margin-right: 2px; }
  body.dark .btn.primary:hover { background: #fff; }