/* ============================================================
 * LABORATORY — the interactive causal selection model.
 * Builds on site-tokens.css, editorial.css and notebook.css
 * (header, figures, tables, chart roles). Spec: design-spec.md §4.
 * ============================================================ */

.lab-page { max-width: 1280px; margin: 0 auto; padding: 0 80px 160px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; }
@media (min-width: 1100px) {
  .lab-page { grid-template-columns: 300px minmax(0, 720px); gap: 56px; align-items: start; }
}
@media (max-width: 900px) { .lab-page { padding: 0 24px 96px; } }

/* control column */
.lab-controls { font-family: var(--ui); color: var(--ink); }
details.lab-settings { margin: 0; padding: 0; border-bottom: 0; }
details.lab-settings > summary { display: none; }
@media (max-width: 1099px) {
  details.lab-settings { border-top: 1px solid var(--ink-soft); border-bottom: 1px solid var(--rule); }
  details.lab-settings > summary { display: flex; font-family: var(--ui); font-size: 15px; font-weight: 500; padding: 12px 0; letter-spacing: 0; text-transform: none; color: var(--ink); }
}
.lab-group { border-top: 1px solid var(--rule); padding: 14px 0 18px; }
.lab-group:first-of-type { border-top: 1px solid var(--ink-soft); }
.lab-group h2 { font-family: var(--f-h3); font-style: italic; font-weight: 500; font-size: 19px; margin: 0 0 12px; color: var(--ink); display: flex; gap: 8px; align-items: baseline; }
.lab-group h2 .n { font-family: var(--ui); font-style: normal; font-size: 12.5px; color: var(--muted); font-weight: 400; }
.lab-help { font-size: 12.5px; color: var(--muted); line-height: 1.45; margin: 4px 0 0; }
.lab-field { margin: 0 0 14px; }
.lab-field:last-child { margin-bottom: 0; }
.lab-label { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: 14px; color: var(--ink-soft); margin: 0 0 6px; }
.lab-label output, .lab-readout { font-size: 15px; color: var(--ink); font-variant-numeric: tabular-nums; }

/* clause editor */
.lab-clause { display: grid; grid-template-columns: minmax(0, 1fr) 32px; gap: 6px; margin-bottom: 6px; align-items: start; }
.lab-clause input {
  width: 100%; box-sizing: border-box; height: 36px; padding: 0 10px; border: 1px solid var(--rule); border-radius: 0;
  background: var(--paper-callout); font-family: var(--mono); font-size: 14px; color: var(--ink); font-variant-ligatures: none;
}
.lab-clause input::placeholder { color: var(--muted-light); opacity: 1; }
.lab-clause input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.lab-clause input[aria-invalid="true"] { border-color: #b3261e; }
.lab-icon-btn { height: 36px; width: 32px; border: 1px solid var(--rule); background: var(--paper); color: var(--ink-soft); font-size: 18px; line-height: 1; cursor: pointer; padding: 0; }
.lab-icon-btn:hover { color: var(--accent-deep); border-color: var(--accent-deep); }
.lab-icon-btn:focus-visible, .lab-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.lab-error { font-size: 13px; color: #b3261e; margin: 2px 0 8px; display: flex; gap: 6px; }
.lab-error::before { content: "!"; font-weight: 700; }
.lab-preview { font-size: 15px; color: var(--ink-soft); margin: 4px 0 10px; min-height: 22px; }

/* buttons in the app */
.lab-btn {
  font-family: var(--ui); font-size: 14px; height: 36px; padding: 0 14px; border: 1px solid var(--rule); background: var(--paper);
  color: var(--ink); cursor: pointer; border-radius: 0; letter-spacing: 0;
}
.lab-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-deep); }
.lab-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.lab-btn.primary:hover:not(:disabled) { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; }
.lab-btn:disabled { color: var(--muted-light); cursor: not-allowed; }
.lab-btn kbd { font-family: var(--ui); font-size: 11px; color: var(--muted); border: 1px solid var(--rule); padding: 0 4px; margin-left: 6px; }
.lab-btn.primary kbd { color: #fff; border-color: rgba(255,255,255,.5); }

/* sliders: square thumb, 2px track */
.lab-range { -webkit-appearance: none; appearance: none; display: block; width: 100%; height: 24px; background: transparent; margin: 0; cursor: pointer; }
.lab-range::-webkit-slider-runnable-track { height: 2px; background: linear-gradient(var(--ink), var(--ink)) 0 / var(--fill, 50%) 100% no-repeat, var(--rule); }
.lab-range::-moz-range-track { height: 2px; background: var(--rule); }
.lab-range::-moz-range-progress { height: 2px; background: var(--ink); }
.lab-range::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; margin-top: -7px; background: var(--paper); border: 1px solid var(--ink); border-radius: 0; }
.lab-range::-moz-range-thumb { width: 14px; height: 14px; background: var(--paper); border: 1px solid var(--ink); border-radius: 0; }
.lab-range:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* segmented control (radio group) */
.lab-seg { display: inline-flex; border: 1px solid var(--rule); }
.lab-seg label { position: relative; }
.lab-seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.lab-seg span { display: block; font-size: 13.5px; padding: 0 12px; height: 32px; line-height: 32px; color: var(--ink-soft); background: var(--paper); }
.lab-seg label + label span { border-left: 1px solid var(--rule); }
.lab-seg input:checked + span { background: var(--ink); color: #fff; }
.lab-seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; position: relative; z-index: 1; }

/* variable rows (prior + actual world) */
.lab-var { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; gap: 4px 12px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--rule-light); }
.lab-var:last-child { border-bottom: 0; }
.lab-var .v { font-family: KaTeX_Math, var(--serif); font-style: italic; font-size: 19px; color: var(--ink); }
.lab-var .p { display: grid; grid-template-columns: minmax(0, 1fr) 40px; gap: 8px; align-items: center; }
.lab-var .p output { font-size: 14px; text-align: right; font-variant-numeric: tabular-nums; }
.lab-var .lab-seg span { height: 28px; line-height: 28px; padding: 0 9px; font-size: 13px; }

/* output column */
.lab-out > section { margin: 0 0 64px; }
.lab-out h2.lab-h { font-family: var(--f-h2); font-weight: 400; font-size: 28px; letter-spacing: -0.3px; margin: 0 0 6px; color: var(--ink); }
.lab-out .lab-sub { font-family: var(--f-body); font-size: 17px; line-height: 1.6; color: var(--ink-soft); max-width: 38em; margin: 0 0 18px; }
.lab-status { font-family: var(--ui); display: flex; flex-wrap: wrap; gap: 6px 22px; align-items: baseline; font-size: 13.5px; color: var(--muted); margin: 0 0 10px; font-variant-numeric: tabular-nums; }
.lab-status b { color: var(--ink); font-weight: 600; }
.lab-stale { color: #8a5a00; }
.lab-stale::before { content: "\25B2\00a0"; font-size: 10px; }

.lab-transport { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 6px; }
.lab-why { font-family: var(--ui); font-size: 12.5px; color: var(--muted); min-height: 18px; margin: 0; }
.lab-why + .nb-figure { margin-top: 16px; }   /* the empty hint line already holds 18px */

/* chain strip */
.chain { display: grid; grid-auto-flow: column; grid-auto-columns: 14px; gap: 3px; overflow-x: auto; padding: 5px 5px 5px 0; }
.chain-col { display: grid; gap: 3px; grid-auto-rows: 14px; }
.chain-cell { width: 14px; height: 14px; box-sizing: border-box; border: 1.25px solid var(--ink); background: var(--paper); }
.chain-cell.on { background: var(--viz-on); }
.chain-col.rej .chain-cell { border-color: var(--muted-light); }
.chain-col.cur .chain-cell { outline: 2px solid var(--accent); outline-offset: 1px; }
.chain-wrap { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; }
.chain-names { display: grid; gap: 3px; grid-auto-rows: 14px; padding-top: 5px; font-family: KaTeX_Math, var(--serif); font-style: italic; font-size: 14px; line-height: 14px; color: var(--ink); text-align: right; }

/* stat readouts */
.stat-row { display: flex; flex-wrap: wrap; gap: 18px 44px; margin: 6px 0 20px; }
.stat .k { font-family: var(--f-figlabel); font-size: 14px; color: var(--ink-soft); }
.stat .v { font-family: var(--ui); font-weight: 600; font-size: 32px; line-height: 1.15; color: var(--ink); font-variant-numeric: proportional-nums; }
.stat .d { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }

/* cause-set chips */
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 14px; }
.chip { position: relative; }
/* the home page's .chip (editorial.css) would draw a second frame round each label */
.chips .chip { padding: 0; border: 0; background: none; font: inherit; letter-spacing: 0; text-transform: none; color: inherit; }
.chips .chip:hover span { border-color: var(--accent); }
.chip input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.chip span { display: block; height: 30px; line-height: 30px; padding: 0 11px; border: 1px solid var(--rule); font-family: KaTeX_Math, var(--serif); font-style: italic; font-size: 15px; color: var(--ink); background: var(--paper); }
.chip input:checked + span { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.chip input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

/* relevance bars */
.rel-row { display: grid; grid-template-columns: 40px minmax(0, 1fr) 56px; gap: 10px; align-items: center; height: 26px; }
.rel-row .v { font-family: KaTeX_Math, var(--serif); font-style: italic; font-size: 16px; text-align: right; }
.rel-row .n { font-family: var(--ui); font-size: 13px; color: var(--ink-soft); text-align: right; font-variant-numeric: tabular-nums; }
.rel-track { position: relative; height: 12px; }
.rel-track::before { content: ""; position: absolute; left: 50%; top: -7px; bottom: -7px; border-left: 1px solid var(--ink-soft); }
.rel-bar { position: absolute; top: 0; height: 12px; background: var(--viz-1); transition: width 150ms ease-out, left 150ms ease-out; }
.rel-bar.neg { background: #8f4700; }
.rel-bar.focus { background: var(--accent); }

.lab-note { font-size: 13px; color: var(--muted); margin: 8px 0 0; max-width: 46em; line-height: 1.5; }
.is-busy { opacity: .6; transition: opacity 120ms; }
@media (prefers-reduced-motion: reduce) { .rel-bar, .is-busy { transition: none; } }

/* phone: the transport bar stays under the masthead while the network and chain are on screen */
@media (max-width: 640px) {
  .lab-transport.sticky { position: sticky; top: var(--masthead-h, 0px); background: var(--paper); padding: 10px 24px; margin: 0 -24px; box-shadow: 0 1px 0 var(--rule); z-index: 5; }
  .lab-transport .lab-btn { flex: 1 1 auto; }
  .stat-row { gap: 14px 28px; }
  .stat .v { font-size: 26px; }
}

.lab-out h3.lab-h3 { font-family: var(--f-h3); font-weight: 500; font-size: 20px; margin: 30px 0 8px; color: var(--ink); }
.full-params { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; margin: 14px 0 4px; }
@media (max-width: 640px) { .full-params { grid-template-columns: minmax(0, 1fr); } }
.lab-sub .katex, .lab-note .katex { font-size: 1.05em; }

.lab-help code, .lab-error code { font-family: var(--mono); font-size: 12px; letter-spacing: 0; color: var(--ink-soft); background: var(--paper-callout); padding: 0 3px; font-variant-ligatures: none; }
.lab-seg { flex-wrap: wrap; max-width: 100%; }
@media (max-width: 640px) { #scen.lab-seg { display: grid; grid-template-columns: 1fr 1fr; border-right: 0; border-bottom: 0; } #scen.lab-seg label + label span { border-left: 0; } #scen.lab-seg span { border: 1px solid var(--rule); margin: -1px 0 0 -1px; text-align: center; } }
.chain-col.cur { outline: 2px solid var(--accent); outline-offset: 2px; }
.chain-col.cur .chain-cell { outline: none; }
.lab-label .lab-name { display: inline-flex; gap: 6px; align-items: baseline; }
table.nb-table tr.is-focus th, table.nb-table tr.is-focus td { font-weight: 600; color: var(--ink); }
table.nb-table tr.is-focus th .math-var { box-shadow: inset 0 -2px 0 var(--accent); }
.rel-track.pos-only::before { left: 0; }
.stat .k.words { font-family: var(--f-figlabel); }
.lab-check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; color: var(--ink-soft); cursor: pointer; }
.lab-check input { width: 16px; height: 16px; margin: 2px 0 0; accent-color: var(--ink); }
.lab-check:has(input:disabled) { color: var(--muted-light); cursor: not-allowed; }
.lab-check input:disabled { cursor: not-allowed; }
.lab-error code { color: inherit; white-space: nowrap; }
#net-cap-text .unit { white-space: nowrap; }
#net-cap-text .math-var { font-size: 1.02em; padding-right: 0.05em; }
#net-cap-text .eq { margin: 0 0.22em; }
#net-cap-text .math-var + .math-var { margin-left: 0.18em; }
#net-cap-text sub { font-family: var(--ui); font-style: normal; font-size: 0.72em; line-height: 0; margin-left: -0.06em; }

/* phone: the long model-code credit would squeeze the name into two lines; stack the two */
@media (max-width: 640px) { .lab .colophon { flex-direction: column; gap: 2px; } }