:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --faint: #8d8d8d;
  --line: #e2e2e2;
  --line-strong: #c9c9c9;
  --panel: #f4f4f5;
  --panel-2: #ebebed;
  --accent: #111111;
  --accent-fg: #ffffff;
  --focus: #2563eb;
  --danger: #b91c1c;
  --hover: rgba(0, 0, 0, 0.06);

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  font-family: var(--sans);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d0d;
    --fg: #f2f2f2;
    --muted: #9a9a9a;
    --faint: #7c7c7c;
    --line: #2a2a2a;
    --line-strong: #3d3d3d;
    --panel: #161616;
    --panel-2: #1f1f1f;
    --accent: #f2f2f2;
    --accent-fg: #0d0d0d;
    --focus: #6ea8fe;
    --danger: #f87171;
    --hover: rgba(255, 255, 255, 0.08);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; height: 100%; overflow: hidden; }
body {
  margin: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.45;
}

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 20;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- top bar ---------- */

.topbar {
  flex: none;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding: 12px max(16px, min(4vw, 32px));
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  font-size: 0.94rem;
  letter-spacing: -0.012em;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
.brand:hover { opacity: 0.72; }
.brand-mark { width: 15px; height: 15px; fill: currentColor; flex: none; }
.brand-dim { color: var(--muted); font-weight: 500; }

.counts {
  padding-left: 20px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  white-space: nowrap;
}
.counts:empty { padding: 0; border: 0; }

.top-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.field {
  position: relative;
  display: flex;
  align-items: center;
}
.field-icon {
  position: absolute;
  left: 9px;
  width: 14px;
  height: 14px;
  color: var(--faint);
  pointer-events: none;
}
.field input {
  width: min(34ch, 46vw);
  font: inherit;
  font-size: 0.83rem;
  padding: 7px 10px 7px 29px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 120ms ease;
}
.field input::placeholder { color: var(--faint); }
.field input:hover { border-color: var(--line-strong); }
.field input:focus-visible { outline-offset: 1px; }

button {
  font: inherit;
  font-size: 0.83rem;
  cursor: pointer;
  min-height: 32px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  transition: background 120ms ease, border-color 120ms ease;
}
button:hover { border-color: var(--fg); }
button:disabled { opacity: 0.5; cursor: default; }
button.ghost {
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  padding: 4px 8px;
  min-height: 26px;
  font-size: 0.78rem;
}
button.ghost:hover { background: var(--hover); border-color: transparent; color: var(--fg); }

/* ---------- layout ---------- */

main {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 20px max(16px, min(4vw, 32px)) 28px;
}

.footer {
  flex: none;
  display: flex;
  gap: 14px;
  justify-content: center;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.76rem;
}
.footer a { color: var(--muted); }

/* ---------- drop zone ---------- */

#panelEmpty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: min(62vh, 28rem);
}

.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 100%;
  max-width: 40rem;
  min-height: 22rem;
  padding: 40px 24px;
  border: 1.5px dashed var(--line-strong);
  border-radius: 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease;
}
.drop:hover, .drop.drag { border-color: var(--fg); background: var(--panel); }
.drop.drag { border-style: solid; }

.drop-art { width: 208px; height: 126px; margin-bottom: 18px; }
.drop-art-grid rect {
  fill: var(--panel);
  stroke: var(--line-strong);
  stroke-width: 1;
}
.drop-art-rules line {
  stroke: var(--bg);
  stroke-width: 1;
  opacity: 0.55;
}
.drop-art-grid .tint {
  fill: hsl(var(--h) 52% 84%);
  fill: oklch(0.862 0.105 var(--h));
  stroke: hsl(var(--h) 34% 66%);
  stroke: oklch(0.735 0.105 var(--h));
}
@media (prefers-color-scheme: dark) {
  .drop-art-rules line {
  stroke: var(--bg);
  stroke-width: 1;
  opacity: 0.55;
}
.drop-art-grid .tint {
    fill: hsl(var(--h) 32% 33%);
    fill: oklch(0.415 0.105 var(--h));
    stroke: hsl(var(--h) 30% 45%);
    stroke: oklch(0.535 0.105 var(--h));
  }
}

.drop-title { margin: 0; font-size: 1rem; font-weight: 550; }
.drop-title code { font-family: var(--mono); font-size: 0.92em; }
.drop-sub { margin: 0; max-width: 44ch; color: var(--muted); font-size: 0.85rem; }

.status { margin: 14px 0 0; min-height: 20px; color: var(--muted); font-size: 0.85rem; }
.status.error { color: var(--danger); }

.no-match { color: var(--muted); font-size: 0.9rem; padding: 24px 2px; }

/* ---------- allocation map ---------- */

#panelMap {
  /* Grow into spare room, but never shrink below the content: a shrunk column
   * overflows its box and draws on top of whatever follows it. */
  flex: 1 0 auto;
  justify-content: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.map-head,
.map-empty,
.others {
  /* flex: none, or a short window squashes these below their content height
   * and they draw on top of one another. */
  flex: none;
  width: var(--map-w, 100%);
  max-width: 100%;
}

/* One row, two lines of text, never rewrapping. The grid's size is solved
 * against the height left over, so a heading that changes height as it
 * changes width leaves the two chasing each other. */
.map-head {
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px 20px;
}
.map-heading { display: flex; flex-direction: column; gap: 3px; min-width: 0; flex: 1 1 auto; }
.map-title,
.map-sub {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.map-controls { display: flex; flex-wrap: nowrap; align-items: center; gap: 8px 14px; flex: none; }
.map-empty {
  margin: 0;
  padding: 10px 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.85rem;
}

.theme-picker { display: inline-flex; align-items: center; gap: 7px; }
.theme-label { color: var(--muted); font-size: 0.76rem; }
.theme-picker select {
  font: inherit;
  font-size: 0.8rem;
  min-height: 30px;
  padding: 4px 26px 4px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23888' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 9px center / 9px 6px;
  color: var(--fg);
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}
.theme-picker select:hover { border-color: var(--fg); }
.map-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 620;
  letter-spacing: -0.015em;
}
.map-sub { margin: 0; color: var(--muted); font-size: 0.83rem; }
.map-sub .mono { font-size: 0.9em; }

/* The matrix is the subject: centre it, and hang the legend under it. */
.map-body {
  flex: none;
  width: var(--map-w, 100%);
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
}

/* The grid sits in its own frame so the empty slots read as empty slots
 * rather than as nothing at all. */
.grid-scroll {
  /* Never squash: the grid is solved to fit, and a squashed frame reports a
   * nonsense height back into that calculation. */
  flex: none;
  width: max-content;
  max-width: 100%;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
}

.side { flex: none; }
.side-head {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.pgn-grid {
  position: relative;
  /* --cell is solved against the measured box in fitGrid(); this is only the
   * value used for the first paint. */
  --cell: 2.4rem;
  display: grid;
  grid-template-columns: 2.9rem repeat(var(--cols, 16), minmax(0, var(--cell)));
  gap: 3px;
  align-content: start;
}
/* 2048 identifiers need smaller cells than 256 parameter groups. */
.pgn-grid[data-range="pdu2"] {
  grid-template-columns: 3.6rem repeat(var(--cols, 16), minmax(0, var(--cell)));
  gap: 1px;
}

.pgn-grid[data-range="pdu2"] .pgn-row-label { padding-right: 6px; }


.pgn-grid[data-range="std11"] {
  grid-template-columns: 2.6rem repeat(var(--cols, 16), minmax(0, var(--cell)));
  gap: 1px;
}

.pgn-grid[data-range="std11"] .pgn-row-label { padding-right: 6px; }


.pgn-col-head,
.pgn-row-label {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-family: var(--mono);
  /* Scaled with the cell: a fixed label height is a floor under the whole
     grid, and the map stops fitting long before the cells get small. */
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.pgn-col-head {
  font-size: var(--label-x, 0.7rem);
  align-items: flex-end;
  padding-bottom: 6px;
  margin-bottom: 3px;
  border-bottom: 1px solid var(--line);
}
/* The crosshair. Two bars over the cells, tinted just enough to read as a
   guide rather than a selection. */
.pgn-cross {
  position: absolute;
  pointer-events: none;
  z-index: 3;
  border-radius: 2px;
  background: color-mix(in srgb, var(--grid-ink, var(--fg)) 9%, transparent);
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--grid-ink, var(--fg)) 16%, transparent);
}
.pgn-cross[hidden] { display: none; }

.pgn-col-head.hl,
.pgn-row-label.hl {
  color: var(--grid-ink, var(--fg));
  font-weight: 700;
}

/* Nibble ticks: 0, 4, 8, C are where blocks tend to get handed out. */
.pgn-col-head.tick,
.pgn-row-label.tick { color: var(--fg); font-weight: 600; }
.pgn-row-label {
  font-size: var(--label-y, 0.7rem);
  justify-content: flex-end;
  padding-right: 9px;
  margin-right: 3px;
  border-right: 1px solid var(--line);
}

.pgn {
  aspect-ratio: 1 / var(--ratio, 1);
  /* A claimed cell is a <button>; without this it inherits the 32px minimum
   * from the button rule and dwarfs the free <div> cells beside it. */
  min-height: 0;
  min-width: 0;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 5px;
}
.pgn.free {
  background: var(--panel);
  box-shadow: inset 0 0 0 1px var(--line);
}

/* --shift lets the adaptive themes darken for a dark page while the fixed
 * themes (blueprint, phosphor) keep their own field in both. */
.pgn-grid { --shift: 0; }

.pgn.used {
  cursor: pointer;
  background: hsl(var(--h) 42% 66%);
  background: oklch(calc(var(--l) + var(--shift)) var(--c) var(--h));
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.17), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}
.pgn.used:hover {
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.17),
    0 0 0 2px var(--grid-bg, var(--bg)),
    0 0 0 3px color-mix(in srgb, var(--grid-ink, var(--fg)) 55%, transparent);
  z-index: 1;
}
.pgn.used.dim { opacity: 0.22; }
.pgn.used.selected {
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.17), 0 0 0 2px var(--grid-bg, var(--bg)),
    0 0 0 3.5px var(--grid-ink, var(--fg));
  z-index: 2;
}
/* Two files claiming the same PGN — worth seeing, not worth a dialog. */
.pgn.used.shared {
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.45) 0 2px,
    transparent 2px 5px
  );
}

@media (prefers-color-scheme: dark) {
  .pgn-grid { --shift: -0.155; }
  /* A theme with its own field carries its own lightness. */
  [data-grid-fixed="true"] .pgn-grid { --shift: 0; }
  .pgn.used { box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.11); }
  .pgn.used.shared {
    background-image: repeating-linear-gradient(
      -45deg,
      rgba(0, 0, 0, 0.32) 0 2px,
      transparent 2px 5px
    );
  }
}

/* ---------- file legend ---------- */

.file-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 4px 4px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  font-size: 0.78rem;
  transition: border-color 120ms ease;
}
.file-chip:hover { border-color: var(--line-strong); }
.file-swatch {
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: hsl(var(--h) 42% 66%);
  background: oklch(var(--l, 0.7) var(--c) var(--h));
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.28);
}
.free-chip .file-swatch { background: var(--panel-2); box-shadow: inset 0 0 0 1px var(--line-strong); }

.file-label {
  min-width: 3ch;
  max-width: 22ch;
  padding: 1px 3px;
  border: 1px solid transparent;
  border-radius: 5px;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 550;
}
.file-label:hover { border-color: var(--line-strong); }
.file-label:focus { outline: none; border-color: var(--fg); background: var(--bg); }
.file-label-static { font-weight: 550; color: var(--muted); }
.file-count {
  color: var(--muted);
  font-size: 0.73rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.file-remove {
  display: grid;
  place-items: center;
  min-height: 24px;
  width: 24px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1;
}
.file-chip:hover .file-remove { border-color: var(--line-strong); color: var(--fg); }
.file-remove:hover {
  border-color: var(--fg);
  background: var(--hover);
  color: var(--fg);
}
/* Touch pointers need a bigger target than a mouse does. */
@media (pointer: coarse) {
  .file-remove { min-height: 30px; width: 30px; }
}

/* ---------- outside Proprietary B ---------- */

.others { margin-top: 2px; }
.others-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.others-head::-webkit-details-marker { display: none; }
.others-head::before {
  content: "";
  width: 0;
  height: 0;
  margin-right: 2px;
  border: 4px solid transparent;
  border-left-color: var(--muted);
  transition: transform 120ms ease;
}
.others[open] .others-head::before { transform: rotate(90deg) translateX(-1px); }
.others-list { padding-top: 6px; }
.others-group {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 10px 0 6px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 600;
}
.others-group:first-child { margin-top: 2px; }
.others-group .others-count { font-weight: 400; }
.others-row { display: flex; flex-wrap: wrap; gap: 5px; }
.others-count { color: var(--muted); font-size: 0.76rem; font-weight: 400; }
.others-list { display: flex; flex-wrap: wrap; gap: 5px; }

.other-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 26px;
  padding: 3px 9px 3px 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  font-size: 0.76rem;
}
.other-chip:hover { border-color: var(--fg); }
.other-chip.selected { border-color: var(--fg); background: var(--panel); box-shadow: inset 0 0 0 1px var(--fg); }
.other-chip .file-swatch { width: 9px; height: 9px; }
.other-id { color: var(--muted); font-size: 0.72rem; }
.other-name { max-width: 24ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- detail ---------- */

dialog.detail {
  width: max-content;
  max-width: min(62rem, calc(100vw - 2rem));
  max-height: min(86dvh, 54rem);
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: var(--bg);
  color: var(--fg);
  overflow: hidden;
}
dialog.detail:not([open]) { display: none; }
dialog.detail[open] { display: flex; flex-direction: column; }
dialog.detail::backdrop {
  background: rgba(18, 18, 20, 0.5);
}
@media (prefers-color-scheme: dark) {
  dialog.detail::backdrop { background: rgba(0, 0, 0, 0.62); }
}

dialog.detail[open] { animation: detail-in 140ms ease-out; }
@keyframes detail-in {
  from { opacity: 0; transform: translateY(6px) scale(0.99); }
  to { opacity: 1; transform: none; }
}

.detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex: none;
  padding: 11px 14px 11px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.detail-title { margin: 0; font-size: 0.9rem; font-weight: 600; }

.detail-body:focus { outline: none; }
.detail-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
}

/* The dialog is the frame, so the cards inside it do not need one. */
.detail-body .card { border: 0; border-radius: 0; }
.detail-body .card + .card { border-top: 1px solid var(--line); }
.detail-body .card-head { background: transparent; }

/* ---------- message card ---------- */

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
  overflow: hidden;
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.msg-name {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 620;
  letter-spacing: -0.01em;
}
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; }
.chip {
  padding: 1px 7px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--bg);
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.6;
  white-space: nowrap;
}
.chip.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.chip.strong { color: var(--fg); border-color: var(--fg); font-weight: 600; }
.chip.muted { border-style: dashed; }
.chip.origin {
  border-color: transparent;
  color: var(--fg);
  font-weight: 550;
  background: hsl(var(--h) 42% 88%);
  background: oklch(0.9 calc(var(--c) * 0.4) var(--h));
}
@media (prefers-color-scheme: dark) {
  .chip.origin {
    background: hsl(var(--h) 30% 28%);
    background: oklch(0.36 calc(var(--c) * 0.5) var(--h));
  }
}

.msg-comment {
  flex-basis: 100%;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.card-body {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  align-items: start;
  gap: 18px 28px;
  padding: 16px 18px 18px;
}

/* ---------- the matrix ---------- */

.matrix {
  display: grid;
  /* A fixed cell, not 1fr: stretching to the dialog width turned a byte into
     a row of banners and squeezed the signal table off the edge. */
  grid-template-columns: 1.9rem repeat(8, minmax(0, 2.5rem));
  gap: 2px;
  align-content: start;
  width: max-content;
  max-width: 100%;
}

.bit-head {
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.gutter {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  border-right: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}
.gutter.over { opacity: 0.45; }

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.05rem;
  padding: 0 3px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-variant-numeric: tabular-nums;
  overflow: hidden;
}

.cell.empty {
  background: var(--panel);
  border-color: var(--panel-2);
  color: var(--faint);
  opacity: 0.75;
}
.cell.empty.over { background: transparent; border-style: dashed; border-color: var(--line); opacity: 0.5; }

/* Signal runs. --h hue, --c chroma, --dl lightness offset are set per signal
 * in JS. The hsl() declarations are a fallback for engines without oklch(). */
.cell.sig,
.legend-main .swatch {
  background: hsl(var(--h) 52% 84%);
  background: oklch(calc(0.862 + var(--dl)) var(--c) var(--h));
  border-color: hsl(var(--h) 34% 66%);
  border-color: oklch(calc(0.735 + var(--dl)) var(--c) var(--h));
}
.cell.sig {
  color: hsl(var(--h) 58% 24%);
  color: oklch(calc(0.375 + var(--dl)) calc(var(--c) * 1.5) var(--h));
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 550;
  transition: opacity 110ms ease;
}

/* Rule off every bit boundary inside a run, so a signal spanning whole bytes
 * still reads as eight bits rather than one bar. --span is set per run. */
.cell.sig::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to right,
    transparent 0 calc((100% + 2px) / var(--span, 1) - 1px),
    currentColor calc((100% + 2px) / var(--span, 1) - 1px) calc((100% + 2px) / var(--span, 1))
  );
  opacity: 0.22;
  pointer-events: none;
}
.cell.sig[data-span="1"]::before { content: none; }

@media (prefers-color-scheme: dark) {
  .cell.sig,
  .legend-main .swatch {
    background: hsl(var(--h) 32% 33%);
    background: oklch(calc(0.415 + var(--dl)) var(--c) var(--h));
    border-color: hsl(var(--h) 30% 45%);
    border-color: oklch(calc(0.535 + var(--dl)) var(--c) var(--h));
  }
  .cell.sig {
    color: hsl(var(--h) 45% 93%);
    color: oklch(calc(0.955 + var(--dl) * 0.2) calc(var(--c) * 0.32) var(--h));
  }
}

.cell-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cell.sig[data-span="1"] .cell-label,
.cell.sig[data-span="2"] .cell-label { visibility: hidden; }

.cell.sig:hover { box-shadow: inset 0 0 0 2px color-mix(in srgb, currentColor 45%, transparent); }

/* Selection: the chosen signal keeps full colour and gains an inner rule,
 * everything else in the card recedes. Unmistakable next to a hover, and it
 * survives a long signal without ringing seventeen rows in black. */
.cell.sig.selected {
  box-shadow: inset 0 0 0 1.5px currentColor;
  z-index: 2;
}
.card.has-selection .cell.sig:not(.selected) { opacity: 0.45; }
.card.has-selection .cell.empty { opacity: 0.5; }
.card.has-selection .legend-row:not(:has(.selected)) { opacity: 0.6; }
.legend-main.selected {
  background: var(--panel);
  border-color: var(--line-strong);
}
.cell.sig.overlap {
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(0, 0, 0, 0.16) 0 2px,
    transparent 2px 6px
  );
}

.matrix-note { margin: 8px 0 0; color: var(--faint); font-size: 0.75rem; }

/* ---------- signal table ---------- */

.pane-title {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: none;
}

.signals { min-width: 0; overflow-x: auto; }
.legend-empty { margin: 0; color: var(--muted); font-size: 0.85rem; }

.sigtable {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
}
.sigtable th {
  padding: 0 8px 6px 0;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.68rem;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}
.sigtable td {
  padding: 5px 8px 5px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: baseline;
  white-space: nowrap;
}
.sigtable .mono { font-family: var(--mono); font-size: 0.73rem; font-variant-numeric: tabular-nums; }
/* The name column takes the slack; the rest hug their content. */
.sigtable .col-signal { width: auto; padding-right: 16px; }
.sigtable th:not(.col-signal),
.sigtable td:not(.col-signal) { width: 1%; }
.sigtable tr:last-child td { border-bottom: 0; }

.signame {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 0;
  padding: 2px 6px 2px 4px;
  margin-left: -4px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  font: inherit;
  font-size: 0.79rem;
  font-weight: 550;
  color: var(--fg);
  text-align: left;
}
.signame:hover { background: var(--panel); border-color: var(--line-strong); }
.signame-text { white-space: nowrap; }
.signame.selected { background: var(--panel); border-color: var(--fg); }

.swatch {
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: hsl(var(--h) 52% 84%);
  background: oklch(calc(0.862 + var(--dl)) var(--c) var(--h));
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.22);
}
@media (prefers-color-scheme: dark) {
  .swatch { background: oklch(calc(0.415 + var(--dl)) var(--c) var(--h)); }
}

.badge {
  padding: 0 5px;
  border-radius: 4px;
  background: var(--accent);
  color: var(--accent-fg);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 600;
  line-height: 1.6;
}

.sigextra td {
  padding: 0 0 8px;
  white-space: normal;
}
.sigcomment {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.75rem;
  max-width: 68ch;
}

.values { margin: 0; }
.values summary {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--muted);
  font-size: 0.71rem;
  cursor: pointer;
}
.values summary:hover { background: var(--panel); color: var(--fg); }
.value-list {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1px 10px;
  margin: 6px 0 2px;
  padding: 8px 10px;
  border-left: 2px solid var(--line);
  font-size: 0.72rem;
}
.value-list dt { color: var(--muted); text-align: right; }
.value-list dd { margin: 0; overflow-wrap: anywhere; }

/* Selection: the chosen signal keeps full colour, the rest recede. */
/* Both rows carry data-sig, so both take .selected from toggleSignal. */
.card.has-selection .sigrow:not(.selected),
.card.has-selection .sigextra:not(.selected) { opacity: 0.55; }

/* ---------- source panel ---------- */

.source {
  grid-column: 1 / -1;
  margin: 0;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.source-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
}
.source-title { color: var(--muted); font-size: 0.76rem; }
.source-title .mono { color: var(--fg); font-size: 0.78rem; }
.source-actions { display: flex; gap: 2px; }

.source-body {
  margin: 0;
  padding: 12px 16px 14px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.6;
}
.source-line {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 10px;
  padding: 1px 0;
}
.source-tag {
  color: var(--faint);
  font-size: 0.68rem;
  text-align: right;
  user-select: none;
}
.source-line code { white-space: pre-wrap; overflow-wrap: anywhere; }

/* ---------- responsive ---------- */

@media (max-width: 880px) {
  .card-body { grid-template-columns: minmax(0, 1fr); }
  .matrix { max-width: 30rem; }
}

@media (max-width: 720px) {
  body { font-size: 14px; }
  .topbar { gap: 8px 12px; padding: 10px 14px; }
  .file-meta { order: 3; flex-basis: 100%; padding-left: 0; border-left: 0; }
  .top-actions { width: 100%; margin-left: 0; }
  .field { flex: 1; }
  .field input { width: 100%; }
  main { padding: 16px 14px 32px; }
  .card-body { padding: 12px; gap: 14px; }
  .card-head { padding: 11px 12px; }
  /* Always fit all sixteen columns: the point of the map is seeing the whole
   * range at once, so the cells shrink rather than the grid scrolling. */
  .grid-scroll { padding: 10px 11px 12px; }
  .pgn-grid { grid-template-columns: 1.9rem repeat(var(--cols, 16), minmax(0, var(--cell))); }
  .pgn-grid[data-range="std11"],
  .pgn-grid[data-range="pdu2"] {
    grid-template-columns: 2.2rem repeat(var(--cols, 16), minmax(0, var(--cell)));
  }


  .pgn-row-label { padding-right: 5px; margin-right: 2px; }
  .pgn-col-head { padding-bottom: 4px; margin-bottom: 2px; }
  .pgn-row-label { padding-right: 4px; }
  .map-title { font-size: 0.98rem; }

  /* On a phone the matrix is narrower than the text beside it, so the column
   * follows the screen rather than the grid. */
  .map-head,
  .map-empty,
  .others {
    width: 100%;
    min-width: 0;
  }
  .file-legend { flex-direction: column; align-items: stretch; width: 100%; }
  .file-chip { width: 100%; }
  .file-count { margin-left: auto; }
  .map-head { flex-wrap: wrap; }
  .map-controls { gap: 8px 10px; flex-wrap: wrap; }
  .map-title, .map-sub { white-space: normal; }
  .theme-picker { flex: 1 1 auto; min-width: 0; }
  .theme-picker select { flex: 1; min-width: 0; }
  .others-head { flex-wrap: wrap; }
  .others-head > span:first-of-type { white-space: nowrap; }
  dialog.detail {
    width: 100vw;
    max-width: 100vw;
    max-height: 100dvh;
    height: 100dvh;
    margin: 0;
    border: 0;
    border-radius: 0;
  }
  .matrix { grid-template-columns: 1.5rem repeat(8, minmax(0, 1fr)); gap: 2px; }
  .cell { min-height: 1.85rem; }
  .cell.sig { font-size: 0.62rem; }
  .cell.sig[data-span="3"] .cell-label { visibility: hidden; }
  .source-line { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .source-tag { text-align: left; }
  .values { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}


/* ---------- themes with their own field ----------
 *
 * --grid-bg, --grid-ink and --grid-rule are set on the root element from the
 * theme definition, so a new one needs no CSS of its own. */

[data-grid-fixed="true"] .grid-scroll {
  background: var(--grid-bg);
  border-color: var(--grid-rule);
}
[data-grid-fixed="true"] .pgn.free {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--grid-rule);
}
[data-grid-fixed="true"] .pgn-col-head,
[data-grid-fixed="true"] .pgn-row-label {
  color: color-mix(in srgb, var(--grid-ink) 62%, transparent);
  border-color: var(--grid-rule);
}
[data-grid-fixed="true"] .pgn-col-head.tick,
[data-grid-fixed="true"] .pgn-row-label.tick { color: var(--grid-ink); }
[data-grid-fixed="true"] .pgn.used { box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.22); }
[data-grid-fixed="true"] .pgn.used.shared {
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(0, 0, 0, 0.3) 0 2px,
    transparent 2px 5px
  );
}

/* ---------- the dialog follows the grid theme ----------
 *
 * By redefining the base tokens rather than restyling each part. Custom
 * properties inherit, so the cards, chips, bit matrix, signal table and DBC
 * source panel all follow at once, for any theme with a field. */

[data-grid-fixed="true"] dialog.detail {
  --bg: var(--grid-bg);
  --fg: var(--grid-ink);
  --panel: color-mix(in srgb, var(--grid-ink) 7%, var(--grid-bg));
  --panel-2: color-mix(in srgb, var(--grid-ink) 12%, var(--grid-bg));
  --line: color-mix(in srgb, var(--grid-ink) 20%, transparent);
  --line-strong: color-mix(in srgb, var(--grid-ink) 38%, transparent);
  --muted: color-mix(in srgb, var(--grid-ink) 74%, transparent);
  --faint: color-mix(in srgb, var(--grid-ink) 52%, transparent);
  --hover: color-mix(in srgb, var(--grid-ink) 11%, transparent);
  --accent: var(--grid-ink);
  --accent-fg: var(--grid-bg);
  border-color: var(--line-strong);
  background: var(--bg);
  color: var(--fg);
}
[data-grid-fixed="true"] dialog.detail::backdrop { background: rgba(0, 0, 0, 0.6); }

/* The cards sit on the dialog, so they must not paint their own ground. */
[data-grid-fixed="true"] .detail-body .card { background: transparent; }
[data-grid-fixed="true"] .detail-body .cell.empty {
  background: color-mix(in srgb, var(--fg) 7%, transparent);
  border-color: transparent;
}