/* Four-pane playground. Base tokens and pane chrome live in theme.css. */
.wm {
  flex: 1 1 auto; min-width: 0;
  display: grid; gap: 16px;
  grid-template-columns: minmax(430px, 1fr) minmax(300px, 1.3fr) minmax(300px, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas: "fn tree prog" "sess tree prog";
}
.pane { padding: 14px 14px 10px; }
.pane-fn { grid-area: fn; }
.pane-tree { grid-area: tree; }
.pane-prog { grid-area: prog; }
.pane-sess { grid-area: sess; }

.fxrow { margin: 2px 0; }
.fxrow .lbl { color: var(--dim); }
.fin {
  font: inherit; color: inherit; background: transparent;
  border: 0; border-bottom: 1px dashed var(--dim);
  padding: 0 1px; width: 37ch; max-width: 100%;
}
.fin:focus { outline: none; border-bottom-color: var(--accent); }
.fin:disabled { color: var(--dim); }
.ferr {
  color: var(--accent); margin: 4px 0 0; display: none; font-size: 13px;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.screen {
  position: relative; display: inline-block; align-self: flex-start;
  border: 1px solid var(--faint); padding: 8px 10px; cursor: ew-resize;
  touch-action: none; max-width: 100%; overflow-x: auto; margin-top: 10px;
}
.screen pre {
  margin: 0; font-family: "Source Code Pro", "Braille Mono", ui-monospace, monospace;
  font-size: 12px; line-height: 12px; letter-spacing: 0; user-select: none;
}
.screen pre.lay { position: absolute; top: 8px; left: 10px; }
.screen pre.grid { color: var(--dim); opacity: .7; }
.screen pre.curve { color: var(--ink); }
.screen pre.tan { color: var(--accent); font-weight: 700; }
.xlabels {
  margin: 2px 0 0 11px; color: var(--dim); white-space: pre;
  font-family: "Source Code Pro", ui-monospace, monospace; font-size: 12px; line-height: 12px;
}
.readrow { margin: 8px 0 0; color: var(--dim); font-size: 13.5px; }
.readrow + .readrow { margin-top: 1px; }
/* fixed 8ch value slots, right-aligned: dragging never jiggles the row, and
   toFixed(4) keeps the decimal points of both lines vertically aligned */
.readrow b, .readrow .g, .readrow .h2 { display: inline-block; min-width: 8ch; text-align: right; }
.readrow b { color: var(--ink); font-weight: 700; }
.readrow .g { color: var(--accent); font-weight: 700; }

.tapewrap, .treewrap { flex: 1 1 auto; min-height: 0; overflow: auto; margin-top: 2px; }
pre.tape, pre.ctree { margin: 0; line-height: 1.5; }
pre.ctree { line-height: 1.55; }
.irline { display: block; cursor: pointer; padding: 0 4px; white-space: pre; }
.irline:hover, .irline.hl { background: var(--faint); }
.irline.peer { box-shadow: inset 3px 0 var(--ink); }
/* chain roles from the runtime: f-only stays ink, df-only accent, shared amber */
.irline.role-derivative { color: var(--accent); }
.irline.role-shared { color: var(--warn); }
.irline.shr { color: var(--dim); }
.irline.sel { background: var(--warn); color: var(--bg); text-shadow: none; font-weight: 700; }
.irline.sel .tid { color: var(--bg); }
.irplain { display: block; padding: 0 4px; }
.tid { color: var(--dim); }
.pfoot { border-top: 1px solid var(--faint); margin-top: 8px; padding-top: 7px; font-size: 13px; flex: 0 0 auto; }

/* mode toggles as chips on the right end of the pane's border line */
.ptitle.pr { left: auto; right: 12px; }
.pane-fn > .ptitle:not(.pr), .pane-tree > .ptitle:not(.pr), .pane-prog > .ptitle:not(.pr) {
  max-width: calc(96% - 15ch);
}

.sessgrid { display: flex; gap: 20px; flex: 1 1 auto; min-height: 0; }
.bootcol { flex: 0 0 auto; }
.logo { position: relative; display: inline-block; }
.logo pre {
  margin: 0; font-family: "Source Code Pro", "Braille Mono", ui-monospace, monospace;
  font-size: 13px; line-height: 13px; user-select: none;
}
.logo pre.lay { position: absolute; top: 0; left: 0; }
.logo .lg-ink { color: var(--ink); }
.logo .lg-acc { color: var(--accent); }
.logo-meta { color: var(--dim); font-size: 12px; margin-top: 8px; line-height: 1.45; }
.logo-meta b { color: var(--ink); font-weight: 700; }
.transcript {
  margin: 0; flex: 1 1 auto; min-width: 0; overflow-y: auto;
  line-height: 1.5; white-space: pre-wrap; word-break: break-word; font-size: 12.5px;
}
.transcript .ps { color: var(--dim); user-select: none; }
.transcript .out { font-weight: 700; }
.transcript .err { color: var(--accent); }
.transcript .cmt { color: var(--dim); }

@media (max-width: 1100px), (max-height: 620px) {
  /* the playground stacks earlier than the docs shell (its grid needs more
     width), so it must also switch the page to normal scrolling itself */
  html, body { overflow: auto; height: auto; }
  .desktop { height: auto; }
  .wm { display: flex; flex-direction: column; }
  .pane-tree .treewrap, .pane-prog .tapewrap { max-height: 50vh; }
  .transcript { max-height: 40vh; }
}
@media (max-width: 700px) {
  /* scale the braille plot to the viewport so touch-drag never fights a
     horizontally scrolling box (56 columns ≈ 33.6em at 0.6em per glyph) */
  .screen { overflow: hidden; }
  .screen pre {
    font-size: clamp(7px, calc((100vw - 76px) / 33.6), 12px);
    line-height: clamp(7px, calc((100vw - 76px) / 33.6), 12px);
  }
  .xlabels {
    font-size: clamp(7px, calc((100vw - 76px) / 33.6), 12px);
    line-height: clamp(7px, calc((100vw - 76px) / 33.6), 12px);
  }
  .sessgrid { flex-direction: column; gap: 10px; }
  .bootcol { display: flex; gap: 14px; align-items: flex-start; }
  .transcript { max-height: 30vh; }
}

/* equation mirror: paints linked source spans under the transparent input */
.finwrap { position: relative; display: inline-block; }
.finwrap .fin { position: relative; z-index: 1; }
.finmirror {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  font: inherit; white-space: pre; color: transparent;
  padding: 0 1px; overflow: hidden;
}
.finmirror mark {
  background: color-mix(in srgb, var(--warn) 40%, transparent);
  color: transparent; border-radius: 2px;
}
.fold { color: var(--warn); font-weight: 700; font-size: 11.5px; }
.irline.sel .fold { color: var(--bg); }

/* autocomplete: a terminal-style dropdown pinned under the caret */
.complete {
  position: fixed; z-index: 40; min-width: 14ch; max-width: 30ch;
  background: var(--bg); border: 1px solid var(--dim);
  font-size: 13px; line-height: 1.5;
}
.complete .ci { display: block; padding: 0 8px; cursor: pointer; color: var(--dim); white-space: pre; }
.complete .ci b { color: var(--ink); font-weight: 700; }
.complete .ci.on { background: var(--ink); color: var(--bg); }
.complete .ci.on b { color: var(--bg); font-weight: 700; }

/* def-mode editor: highlight mirror behind a transparent-background textarea,
   same trick as .finwrap — metrics must match the textarea exactly */
.fdefwrap { position: relative; display: block; margin: 2px 0; }
.fdefwrap[hidden] { display: none; }
.fdef {
  position: relative; z-index: 1; display: block; margin: 0;
  font: inherit; color: inherit; background: transparent; width: 100%;
  border: 1px solid var(--faint); padding: 6px 8px;
  resize: vertical; line-height: 1.45; tab-size: 4;
}
.fdef:focus { outline: none; border-color: var(--accent); }
.fdefmirror {
  position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
  margin: 0; font: inherit; line-height: 1.45; tab-size: 4;
  white-space: pre-wrap; overflow-wrap: break-word;
  border: 1px solid transparent; padding: 6px 8px; color: transparent;
}
.fdefmirror mark {
  background: color-mix(in srgb, var(--warn) 40%, transparent);
  color: transparent; border-radius: 2px;
}
.screen pre.para { color: var(--add); }
.readrow .h2 { color: var(--add); font-weight: 700; }
.irline.irrun { color: var(--del); opacity: .75; }
.irline.irrun:hover { background: var(--faint); opacity: 1; }
.pfoot .btns { display: flex; gap: 14px; flex-wrap: wrap; }
#loadfile { display: none; }