.tb-room{
    --ink:#111110;
    --bg:#ffffff;
    --surface:#fafaf9;
    --muted:#6b6b68;
    --line:#e7e5e2;
    --accent:#f5c518;
    --room:#1f1f1c;
    --rust:#9a3324;
    --green:#1f5d50;
    --blue:#2c4a7c;
    --purple:#6b4a8a;
    --olive:#8a6a2f;
    --serif:"Instrument Serif",Georgia,serif;
    --body:"Newsreader",Georgia,serif;
    --mono:"JetBrains Mono",ui-monospace,monospace;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  /* scoped to .tb-room, not body — body belongs to the Lab shell */
  .tb-room{
    background:var(--bg);color:var(--ink);
    font-family:var(--body);font-size:17px;line-height:1.55;
    overflow-x:clip;
  }
  .tb-room ::selection{background:var(--ink);color:var(--accent);}

  .mono{font-family:var(--mono);}
  .stage{
    position:relative;border-top:1px solid var(--line);
    padding:0;overflow:clip;
  }
  .stage-label{
    position:absolute;top:18px;left:22px;z-index:20;
    font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
    display:flex;gap:14px;align-items:baseline;pointer-events:none;
  }
  .stage-label .no{color:var(--accent);background:var(--ink);padding:2px 7px;}
  .stage-label .nm{color:var(--muted);}
  .stage.dark .stage-label .nm{color:#a5a29a;}
  .stage-note{
    position:absolute;bottom:16px;left:22px;z-index:20;max-width:44ch;
    font-family:var(--mono);font-size:10px;letter-spacing:.06em;line-height:1.7;
    color:var(--muted);text-transform:uppercase;pointer-events:none;
  }
  .stage.dark{background:var(--room);color:#f2efe6;}
  .stage.dark .stage-note{color:#8f8c83;}

.stage-src{
    position:absolute;top:18px;right:22px;z-index:20;max-width:36ch;text-align:right;
    font-family:var(--mono);font-size:9px;letter-spacing:.13em;line-height:1.8;
    color:#a8a49c;text-transform:uppercase;pointer-events:none;
  }
  .stage.dark .stage-src{color:#8b877e;}
  /* several stages put drawn artwork right under these captions — a scrim
     keeps them readable without printing a box over the picture */
  .stage.dark .stage-src,.stage.dark .stage-note{
    text-shadow:0 1px 3px rgba(0,0,0,.95),0 0 12px rgba(0,0,0,.8);
  }
  @media (max-width:900px){.stage-src{display:none;}}

@keyframes tick{to{stroke-dashoffset:0;}}

.morph-stage{min-height:56vh;display:flex;align-items:center;justify-content:center;gap:4vw;flex-wrap:wrap;background:var(--bg);padding:14vh 6vw;}

.morph{
    position:relative;border:none;cursor:pointer;overflow:clip;background:var(--ink);color:#f2efe6;
    font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
    padding:0;width:230px;height:58px;transition:width .5s cubic-bezier(.16,1,.3,1),background .3s;
  }

.morph .lay{position:absolute;inset:0;display:grid;place-items:center;transition:transform .45s cubic-bezier(.16,1,.3,1),opacity .3s;}

.morph .l2{transform:translateY(100%);opacity:0;}

.morph .l3{transform:translateY(100%);opacity:0;}

.morph:hover .l1{transform:translateY(-100%);opacity:0;}

.morph:hover .l2{transform:translateY(0);opacity:1;}

.morph.done{width:58px;background:var(--accent);}

.morph.done .l1,.morph.done .l2{opacity:0;transform:translateY(-100%);}

.morph.done .l3{opacity:1;transform:translateY(0);}

.morph.done .l3 svg{stroke:var(--ink);}

.morph .l3 svg path{stroke-dasharray:26;stroke-dashoffset:26;}

.morph.done .l3 svg path{animation:tick .4s .18s cubic-bezier(.16,1,.3,1) forwards;}

.morph-note{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);max-width:26ch;line-height:1.9;}

@media (prefers-reduced-motion: reduce){
    *,*::before,*::after{animation-duration:.001s !important;animation-iteration-count:1 !important;transition-duration:.001s !important;}
    .scrub-wrap,.roll-wrap,.hz-wrap,.wt-wrap,.dw,.cyl{height:auto;}
    .scrub-pin,.roll-pin,.hz-pin,.wt-pin,.dw-pin,.cyl-pin{position:static;height:auto;min-height:0;padding:10vh 6vw;}
    .stack-card{position:static;height:auto;margin-top:6vh;}
    .crt .roll{display:none;}
  }