.bm {
  display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 12px;
  padding: 12px; max-width: 1600px; margin: 0 auto; align-items: start;
}
.stage { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.tabs { justify-content: flex-start; }
.tabs .seg > button { min-width: 90px; font-weight: 600; }
.view { display: flex; flex-direction: column; gap: 8px; min-width: 0; }

.plot-wrap { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.plot-wrap canvas { width: 100%; height: 100%; }
.plot-wrap.dark { background: var(--panel); }

/* Room for the longest read-out, so the canvases under it never move. */
.readout { display: flex; flex-wrap: wrap; align-items: baseline; align-content: flex-start; gap: 2px 18px; padding: 0 4px; min-height: 2.9em; color: var(--ink-2); }
.readout b { color: var(--ink); }
.readout .probe { color: var(--ink); font-variant-numeric: tabular-nums; }
.readout .good { color: var(--good); font-weight: 600; }
.readout .warn { color: var(--warn); font-weight: 600; }
/* A number in bold in its fixed slot (lib/style.css .fixnum). */
.fixnum.b { font-weight: 600; color: var(--ink); }

/* The bench. */
.bench-wrap { height: max(300px, calc(58vh - 70px)); }
.bench-wrap canvas { cursor: grab; }
.bench-wrap canvas.dragging { cursor: grabbing; }
.gouy-wrap { height: max(130px, 17vh); }
.table-wrap { overflow-x: auto; }
/* Fixed columns: the numbers (in slots of their own) change without moving the columns. */
table.waists { border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; width: 100%; min-width: 780px; table-layout: fixed; }
table.waists th:nth-child(1) { width: 19%; }
table.waists th:nth-child(2) { width: 13%; }
table.waists th:nth-child(3) { width: 14%; }
table.waists th:nth-child(4) { width: 16%; }
table.waists th:nth-child(5) { width: 18%; }
table.waists th { text-align: left; font-weight: 600; color: var(--ink-2); padding: 3px 10px 3px 4px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.waists td { padding: 3px 10px 3px 4px; border-bottom: 1px solid var(--line); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
table.waists tr.virtual td { color: var(--ink-3); }

/* The cavity. */
.cav-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 34%); gap: 8px; }
.cav-wrap { height: max(280px, 44vh); }
.sq-wrap { height: max(220px, 44vh); }
.cav-grid .sq-wrap:last-child { height: max(200px, 30vh); }
.spec-wrap { height: max(200px, 30vh); }
#stability { cursor: crosshair; }
dl.numbers { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 3px 10px; margin: 0; font-size: 13px; }
dl.numbers dt { color: var(--ink-2); }
dl.numbers dd { margin: 0; font-variant-numeric: tabular-nums; }

/* The modes. */
.mode-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 8px; align-items: start; }
.cross-col { min-width: 0; }
.sq-dark { width: 100%; aspect-ratio: 1; background: #000; border-radius: var(--radius); overflow: hidden; }
.sq-dark canvas { width: 100%; height: 100%; }
.side-col { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.mside-wrap { height: max(220px, 30vh); }
.mgouy-wrap { height: max(150px, 20vh); }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 6px; }
.gallery.g-hg { grid-template-columns: repeat(4, 64px); }
.gallery.g-lg { grid-template-columns: repeat(7, 64px); }
.gallery.g-mix { grid-template-columns: repeat(6, 64px); }
.thumb { display: flex; flex-direction: column; align-items: center; gap: 1px; padding: 3px; }
.thumb canvas { width: 48px; height: 48px; border-radius: 4px; background: #000; }
.thumb span { font-size: 11px; color: var(--ink-2); }

/* Controls. */
.controls { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.view-controls { display: flex; flex-direction: column; gap: 10px; }
.controls .panel { display: flex; flex-direction: column; gap: 6px; }
.button-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; }
.button-grid button { padding: 3px 4px; font-size: 13px; }
/* The list of what is on the bench: a row each, to edit it or take it off. */
.el-list { display: flex; flex-direction: column; gap: 4px; }
.el-list:empty { display: none; }
.el-row { display: flex; gap: 4px; align-items: stretch; }
.el-pick { flex: 1; min-width: 0; text-align: left; font-size: 12px; padding: 3px 8px; min-height: 28px; }
.el-x { font-size: 12px; min-width: 30px; min-height: 28px; padding: 2px 6px; color: var(--ink-2); }
.el-x:hover { color: var(--warn); border-color: var(--warn); }
.presets button { font-size: 12px; padding: 2px 8px; min-height: 26px; }
/* What the pointer can do, under the bench (lib/style.css .hint): kept two lines tall so nothing
   below moves as its text changes with what is under the pointer. */
#bench-hint { min-height: 2.6em; padding: 0 4px; line-height: 1.3; }
@media (min-width: 1200px) { #bench-hint { min-height: 1.4em; } }
.cav-grid .hint { grid-column: 1 / -1; padding: 0 4px; }
#modes-hint { padding: 0 4px; }
/* The obscure controls, folded away ("More: ...") until wanted. */
.controls details.more > summary { cursor: pointer; color: var(--accent); font-size: 13px; }
.controls details.more[open] > summary { margin-bottom: 6px; }
.editor-head { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 6px; }
.editor-head .remove { font-size: 12px; min-height: 24px; }
.signed { display: flex; flex-direction: column; gap: 4px; }
.sign-seg button { font-size: 12px; padding: 2px 8px; min-height: 26px; }
.el-info { color: var(--ink-2); display: flex; flex-direction: column; gap: 2px; }
.el-info b { color: var(--ink); }
.el-info .warn { color: var(--warn); }
.lens-plot-wrap { height: 190px; border: 1px solid var(--line); border-radius: 6px; margin-top: 4px; }
details.lens-law summary { cursor: pointer; color: var(--accent); }
.lens-plot { width: 100%; height: 100%; }
.formula { min-height: 1.8em; overflow-x: auto; }
.formula math { font-size: 1.05em; }
#cross-show, #side-show { gap: 8px; }
#cross-show .seg button, #side-show .seg button, #field-box .seg button { font-size: 13px; padding: 3px 8px; }

@media (max-width: 1000px) {
  .bm { grid-template-columns: minmax(0, 1fr); }
  .cav-grid { grid-template-columns: minmax(0, 1fr); }
  .sq-wrap, .cav-grid .sq-wrap:last-child { height: auto; aspect-ratio: 1; max-height: 70vh; }
  /* One column: the hint right under the cavity picture, before the stability diagram. */
  .cav-grid .cav-wrap { order: -2; }
  .cav-grid .hint { order: -1; }
  /* Likewise the modes' hint right under the cross-section: the grid's two columns become
     children of the view's column, with the side view and the gallery after the hint. */
  .mode-grid { display: contents; }
  .side-col { order: 1; }
  #gallery-head, #gallery { order: 2; }
  .bench-wrap { height: max(280px, 46vh); }
}
@media (max-width: 700px) {
  .readout { min-height: 4.4em; }
  /* The waist table fits the width: smaller, and without its notes (a virtual waist is greyed). */
  table.waists { min-width: 0; font-size: 12px; }
  table.waists th, table.waists td { padding: 3px 4px 3px 2px; white-space: normal; }
  table.waists th:nth-child(6), table.waists td:nth-child(6) { display: none; }
  table.waists th:nth-child(1) { width: 24%; }
  table.waists th:nth-child(2), table.waists th:nth-child(3), table.waists th:nth-child(4), table.waists th:nth-child(5) { width: 19%; }
}
@media (max-width: 520px) {
  .gallery.g-hg { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .gallery.g-lg { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .gallery.g-mix { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tabs .seg > button { min-width: 0; }
}