/* Galley — a Crouwel-grid workbench for Markdown → LaTeX.
   One blue, one ink, graph paper on a 24px module, and a single diagonal:
   LaTeX's backslash. See DESIGN.md for the system. */

/* ------------------------------------------------------------------ tokens */

:root {
  --blue: #0057FF;
  --blue-press: #0046CC;
  --on-blue: #FFFFFF;
  --ink: #111111;
  --ink-2: #3A4253;
  --muted: #5A6478;
  --faint: #A9B2C3;
  --paper: #FFFFFF;
  --surface: #F5F7FA;
  --grid: #E6EBF2;
  --grid-strong: #D3DBE7;
  --wash: rgba(0, 87, 255, 0.09);
  --wash-strong: rgba(0, 87, 255, 0.18);
  --mark-bg: rgba(0, 87, 255, 0.11);
  --signal: #D7320F;
  --signal-wash: rgba(215, 50, 15, 0.08);
  --shadow: 0 12px 32px -8px rgba(17, 24, 39, 0.24), 0 2px 6px rgba(17, 24, 39, 0.08);
  --scrim: rgba(17, 17, 17, 0.32);

  --t-cmd: #0057FF;
  --t-env: #0040BD;
  --t-brace: #8691A6;
  --t-com: #6F7A8F;
  --t-math-bg: rgba(0, 87, 255, 0.06);
  --t-esc: #111111;
  --t-md: #0057FF;
  --t-mdmuted: #8691A6;

  --m: 24px;                 /* the module */
  --gut: 52px;               /* line-number gutter */
  --font-ui: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-code: "Kode Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

[data-theme="night"] {
  --blue: #4D8DFF;
  --blue-press: #3B7BF0;
  --on-blue: #0B0D12;
  --ink: #EDF1F7;
  --ink-2: #C3CBD9;
  --muted: #9AA4B8;
  --faint: #566074;
  --paper: #111111;
  --surface: #1A1A1A;
  --grid: #1C222D;
  --grid-strong: #283040;
  --wash: rgba(77, 141, 255, 0.12);
  --wash-strong: rgba(77, 141, 255, 0.24);
  --mark-bg: rgba(77, 141, 255, 0.16);
  --signal: #FF6A45;
  --signal-wash: rgba(255, 106, 69, 0.10);
  --shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.6), 0 2px 8px rgba(0, 0, 0, 0.4);
  --scrim: rgba(0, 0, 0, 0.55);

  --t-cmd: #6EA3FF;
  --t-env: #9EC1FF;
  --t-brace: #6C7890;
  --t-com: #7E889C;
  --t-math-bg: rgba(77, 141, 255, 0.10);
  --t-esc: #EDF1F7;
  --t-md: #6EA3FF;
  --t-mdmuted: #6C7890;

  color-scheme: dark;
}

/* ------------------------------------------------------------------ base */

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

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 14px/1.45 var(--font-ui);
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--blue); color: var(--on-blue); }

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

a { color: var(--blue); text-underline-offset: 3px; }

kbd {
  font: 500 11px/1 var(--font-code);
  letter-spacing: 0;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.num { font-family: var(--font-code); font-variant-numeric: tabular-nums; }

* { scrollbar-width: thin; scrollbar-color: var(--grid-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--grid-strong); border: 2px solid var(--paper); }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }
::-webkit-scrollbar-corner { background: transparent; }

/* ------------------------------------------------------------------ app frame */

.app {
  height: 100dvh;
  min-height: 520px;
  display: grid;
  grid-template-rows: 56px minmax(0, 1fr) auto 28px;
  grid-template-areas: "top" "work" "band" "status";
}

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

.top {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px 0 14px;
  border-bottom: 1px solid var(--blue);
  background: var(--paper);
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  flex: none;
  padding: 4px 4px 4px 0;
}
.brand-mark { width: 28px; height: 28px; color: var(--blue); --mark-ink: var(--paper); }
[data-theme="night"] .brand-mark { --mark-ink: #0B0D12; }
.brand-word { width: 76px; height: 26px; color: var(--ink); }
.brand-sub {
  font-size: 12px;
  font-weight: 600;
  font-stretch: 78%;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  padding-left: 12px;
  border-left: 1px solid var(--grid-strong);
  line-height: 24px;
  white-space: nowrap;
}

.field select {
  appearance: none;
  height: 36px;
  min-width: 180px;
  padding: 0 34px 0 12px;
  border: 1px solid var(--grid-strong);
  border-radius: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink) 50%),
    linear-gradient(-45deg, transparent 50%, var(--ink) 50%);
  background-position: calc(100% - 17px) 16px, calc(100% - 12px) 16px;
  background-size: 5px 5px;
  background-repeat: no-repeat;
  color: var(--ink);
  font-size: 13.5px;
}
.field select:hover { border-color: var(--ink); }
.field select:focus-visible { border-color: var(--blue); outline-offset: 0; }
.field select option { background: var(--paper); color: var(--ink); }

.top-actions, .top-icons {
  display: flex;
  align-items: center;
  gap: 8px;
}
.top-actions { margin-left: auto; }
.top-icons { gap: 2px; padding-left: 8px; border-left: 1px solid var(--grid-strong); }

/* ------------------------------------------------------------------ buttons */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 0;
  background: none;
  font-weight: 600;
  font-size: 13.5px;
  white-space: nowrap;
  transition: background-color 140ms var(--ease-out), border-color 140ms var(--ease-out), color 140ms var(--ease-out);
}
.btn svg { width: 18px; height: 18px; flex: none; }

.btn-primary {
  background: var(--blue);
  color: var(--on-blue);
  padding-right: 10px;
}
.btn-primary:hover { background: var(--blue-press); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:focus-visible { outline-color: var(--ink); }
.btn-primary .btn-slash { width: 20px; height: 20px; margin-left: 2px; }
.btn-kbd {
  padding: 3px 5px 2px;
  border: 1px solid color-mix(in srgb, var(--on-blue) 45%, transparent);
  color: color-mix(in srgb, var(--on-blue) 88%, transparent);
}

.btn-outline {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--paper);
}
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }

.btn-quiet { color: var(--ink); padding: 0 10px; }
.btn-quiet:hover { background: var(--surface); color: var(--blue); }

.btn.is-done { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid transparent;
  background: none;
  color: var(--ink-2);
  text-decoration: none;
  transition: background-color 140ms var(--ease-out), color 140ms var(--ease-out);
}
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn:hover { background: var(--surface); color: var(--blue); }
.icon-btn-sm { width: 28px; height: 28px; }
.icon-btn-sm svg { width: 16px; height: 16px; }
.icon-btn:disabled { color: var(--faint); background: none; }

.tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 8px;
  border: 0;
  background: none;
  color: var(--ink-2);
  font-size: 12.5px;
  font-weight: 500;
}
.tool svg { width: 16px; height: 16px; }
.tool:hover { color: var(--blue); background: var(--wash); }

.link-btn {
  border: 0;
  padding: 0;
  background: none;
  color: var(--blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.link-btn:hover { text-decoration-thickness: 2px; }

/* ------------------------------------------------------------------ switch */

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 4px;
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  font-size: 13.5px;
}
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch-track {
  position: relative;
  width: 34px;
  height: 18px;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  transition: background-color 140ms var(--ease-out), border-color 140ms var(--ease-out);
}
.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  transition: transform 160ms var(--ease-out), background-color 140ms;
}
.switch input:checked + .switch-track { background: var(--blue); border-color: var(--blue); }
.switch input:checked + .switch-track .switch-thumb { transform: translateX(16px); background: var(--on-blue); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--blue); outline-offset: 2px; }
.switch:hover .switch-track { border-color: var(--blue); }
.switch-sm { height: 28px; font-size: 12.5px; font-weight: 500; color: var(--ink-2); }
.switch-sm .switch-track { width: 28px; height: 16px; }
.switch-sm .switch-thumb { width: 9px; height: 9px; }
.switch-sm input:checked + .switch-track .switch-thumb { transform: translateX(12px); }
.switch-sm input:checked ~ .switch-label { color: var(--blue); }

/* ------------------------------------------------------------------ segmented control */

.seg {
  display: inline-flex;
  border: 1px solid var(--blue);
  height: 28px;
  flex: none;
}
.seg label, .seg button {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg label > span, .seg button {
  position: relative;
  z-index: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 12px;
  border: 0;
  background: none;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--blue);
  white-space: nowrap;
}
/* The selected segment is a parallelogram leaning like a backslash. */
.seg label > span::before, .seg button::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 -3px;
  background: var(--blue);
  transform: skewX(18deg) scaleX(0);
  transition: transform 160ms var(--ease-out);
}
.seg input:checked + span, .seg button[aria-selected="true"] { color: var(--on-blue); }
.seg input:checked + span::before, .seg button[aria-selected="true"]::before { transform: skewX(18deg) scaleX(1); }
.seg input:focus-visible + span { outline: 2px solid var(--ink); outline-offset: -2px; }
.seg label:first-child > span::before, .seg button:first-child::before { left: -16px; }
.seg label:last-child > span::before, .seg button:last-child::before { right: -16px; }
.seg { overflow: hidden; }
.seg label:hover span:not(:where(input:checked + span)) { background: var(--wash); }

/* ------------------------------------------------------------------ work area */

.tabs { display: none; }

.work {
  grid-area: work;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 0;
}

.pane {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--paper);
}
.pane-in { border-right: 1px solid var(--blue); }

.pane-head {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 40px;
  padding: 0 8px 0 16px;
  border-bottom: 1px solid var(--grid-strong);
  background: var(--paper);
  flex: none;
  min-width: 0;
}
.pane-title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  font-stretch: 80%;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  flex: none;
}
.pane-meta {
  font: 400 12px/1 var(--font-code);
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.pane-tools { margin-left: auto; display: flex; gap: 2px; flex: none; }

/* Graph paper: a module-square grid that scrolls with the text, plus the gutter strip. */
.paper {
  background-image:
    linear-gradient(to right, var(--surface) calc(var(--gut) - 1px), var(--grid-strong) calc(var(--gut) - 1px), var(--grid-strong) var(--gut), transparent var(--gut)),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px),
    linear-gradient(to right, var(--grid) 1px, transparent 1px);
  background-size: 100% 100%, var(--m) var(--m), var(--m) var(--m);
  background-position: 0 0, 0 -1px, calc(var(--gut) - 1px) 0;
  background-repeat: no-repeat, repeat, repeat;
}

/* Code lines: input mirror and output share this. */
.code {
  font-family: var(--font-code);
  font-size: 14px;
  line-height: var(--m);
  font-variant-ligatures: none;
  font-variant-numeric: tabular-nums;
  tab-size: 4;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: normal;
}
.ln {
  position: relative;
  min-height: var(--m);
  padding: 0 16px 0 calc(var(--gut) + 12px);
}
.ln::before {
  content: attr(data-n);
  position: absolute;
  left: 0;
  width: calc(var(--gut) - 10px);
  text-align: right;
  font-size: 11.5px;
  color: var(--faint);
  pointer-events: none;
  user-select: none;
}
.ln.src, .ln.link { background: var(--wash); }
.ln.src::before, .ln.link::before { color: var(--blue); font-weight: 700; }
.ln.src::after, .ln.link::after {
  content: "";
  position: absolute;
  left: calc(var(--gut) - 3px);
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--blue);
}
.ln.cur:not(.src)::before { color: var(--ink); }

/* Input editor: a transparent textarea over a highlighted mirror. */
.ed {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.ed-hl {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.ed-lines {
  min-height: 100%;
  padding: 0 0 calc(var(--m) * 4);
  will-change: transform;
}
.ed-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0 16px calc(var(--m) * 4) calc(var(--gut) + 12px);
  border: 0;
  border-radius: 0;
  resize: none;
  outline: none;
  background: transparent;
  color: transparent;
  caret-color: var(--blue);
  overflow: auto;
}
.ed-input::selection { background: var(--wash-strong); color: transparent; }
.ed-input::placeholder { color: var(--muted); }
.ed:focus-within { box-shadow: inset 0 0 0 1px var(--blue); }

/* Markdown highlighting in the mirror */
.md-h { color: var(--ink); font-weight: 700; }
.md-hm, .md-list, .md-quote, .md-div, .md-fn, .md-link-u { color: var(--t-md); }
.md-hm { font-weight: 700; }
.md-em { color: var(--ink); }
.md-strong { font-weight: 700; }
.md-delim, .md-fence, .md-punct, .md-hr, .md-attr { color: var(--t-mdmuted); }
.md-code { background: var(--surface); box-shadow: 0 0 0 1px var(--grid-strong); }
.md-math { background: var(--t-math-bg); }
.md-tex { color: var(--t-cmd); }
.md-com { color: var(--t-com); }
.md-pipe { color: var(--t-md); }

/* Output */
.out {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: auto;
  outline: none;
}
.out:focus-visible { box-shadow: inset 0 0 0 2px var(--blue); }
.out-code {
  min-height: 100%;
  padding: 0 0 calc(var(--m) * 4);
  color: var(--ink);
}
.out-code.is-stale { opacity: 0.5; }

.t-cmd { color: var(--t-cmd); }
.t-env { color: var(--t-env); font-weight: 700; }
.t-brace { color: var(--t-brace); }
.t-com { color: var(--t-com); }
.t-math { background: var(--t-math-bg); }
.t-esc { color: var(--t-esc); font-weight: 700; }

/* Construction marks: invisible until Construction is on. */
.mk { background: none; color: inherit; padding: 0; }
.mk.z { display: none; }
.construct .mk {
  background: var(--mark-bg);
  box-shadow: inset 0 -1.5px 0 var(--blue);
}
.construct .mk.z {
  display: inline-block;
  width: 9px;
  height: 18px;
  margin: 0 1px;
  vertical-align: -4px;
  background:
    linear-gradient(to bottom right, transparent calc(50% - 0.8px), var(--blue) calc(50% - 0.8px), var(--blue) calc(50% + 0.8px), transparent calc(50% + 0.8px));
  box-shadow: none;
}
.construct.has-focus .mk { background: transparent; box-shadow: inset 0 -1px 0 var(--grid-strong); }
.construct[data-focus="escape"] .mk[data-k="escape"],
.construct[data-focus="quote"] .mk[data-k="quote"],
.construct[data-focus="ellipsis"] .mk[data-k="ellipsis"],
.construct[data-focus="dash"] .mk[data-k="dash"],
.construct[data-focus="tie"] .mk[data-k="tie"],
.construct[data-focus="space"] .mk[data-k="space"],
.construct[data-focus="shorthand"] .mk[data-k="shorthand"],
.construct[data-focus="unicode"] .mk[data-k="unicode"],
.construct[data-focus="invisible"] .mk[data-k="invisible"],
.construct[data-focus="ligature"] .mk[data-k="ligature"],
.construct[data-focus="dehyphen"] .mk[data-k="dehyphen"] {
  background: var(--blue);
  color: var(--on-blue);
  box-shadow: none;
}
.construct[data-focus="escape"] .mk[data-k="escape"] *,
.construct[data-focus="quote"] .mk[data-k="quote"] *,
.construct[data-focus="ellipsis"] .mk[data-k="ellipsis"] *,
.construct[data-focus="dash"] .mk[data-k="dash"] *,
.construct[data-focus="tie"] .mk[data-k="tie"] *,
.construct[data-focus="space"] .mk[data-k="space"] *,
.construct[data-focus="shorthand"] .mk[data-k="shorthand"] *,
.construct[data-focus="unicode"] .mk[data-k="unicode"] *,
.construct[data-focus="invisible"] .mk[data-k="invisible"] *,
.construct[data-focus="ligature"] .mk[data-k="ligature"] *,
.construct[data-focus="dehyphen"] .mk[data-k="dehyphen"] * { color: var(--on-blue) !important; }
.construct[data-focus="escape"] .mk[data-k="escape"].z,
.construct[data-focus="quote"] .mk[data-k="quote"].z,
.construct[data-focus="ellipsis"] .mk[data-k="ellipsis"].z,
.construct[data-focus="dash"] .mk[data-k="dash"].z,
.construct[data-focus="tie"] .mk[data-k="tie"].z,
.construct[data-focus="space"] .mk[data-k="space"].z,
.construct[data-focus="shorthand"] .mk[data-k="shorthand"].z,
.construct[data-focus="unicode"] .mk[data-k="unicode"].z,
.construct[data-focus="invisible"] .mk[data-k="invisible"].z,
.construct[data-focus="ligature"] .mk[data-k="ligature"].z,
.construct[data-focus="dehyphen"] .mk[data-k="dehyphen"].z {
  background:
    linear-gradient(to bottom right, transparent calc(50% - 1.3px), var(--blue) calc(50% - 1.3px), var(--blue) calc(50% + 1.3px), transparent calc(50% + 1.3px));
}
.mk.cur { outline: 2px solid var(--ink); outline-offset: 1px; }
.construct .mk.flash { animation: cell 360ms steps(3, end); }
@keyframes cell {
  0% { background: var(--ink); color: var(--paper); }
  100% { background: var(--blue); color: var(--on-blue); }
}

.stale {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 16px;
  border-bottom: 1px solid var(--grid-strong);
  background: var(--surface);
  font-size: 12.5px;
  color: var(--ink-2);
  flex: none;
}

.empty {
  position: absolute;
  top: calc(var(--m) * 2);
  left: calc(var(--gut) + 12px);
  right: 24px;
  max-width: 46ch;
  padding: 20px 22px 18px;
  border: 1px solid var(--blue);
  background: var(--paper);
}
.empty p { margin: 0 0 8px; color: var(--ink-2); }
.empty-title { font-size: 16px; font-weight: 700; color: var(--ink) !important; }
.empty-ex { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0 !important; }
.empty-ex .btn { height: 32px; font-size: 13px; }

.preamble {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 40px;
  padding: 6px 8px 6px 16px;
  border-top: 1px solid var(--grid-strong);
  background: var(--surface);
  flex: none;
  min-width: 0;
}
.preamble-label {
  font-size: 11px;
  font-weight: 700;
  font-stretch: 80%;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  flex: none;
}
.preamble-list {
  font: 12.5px/18px var(--font-code);
  color: var(--ink);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.preamble-list .t-cmd { color: var(--t-cmd); }
.preamble .tool { margin-left: auto; flex: none; }

.drop {
  position: absolute;
  inset: 40px 0 0;
  z-index: 3;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  border: 2px dashed var(--blue);
}
.drop span { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--blue); font-size: 16px; }
.drop svg { width: 24px; height: 24px; }

/* ------------------------------------------------------------------ construction band */

.band {
  grid-area: band;
  display: grid;
  grid-template-columns: 184px minmax(0, 1fr) 132px;
  height: 104px;
  border-top: 1px solid var(--blue);
  background: var(--paper);
}
.band-lead {
  display: flex;
  flex-direction: column;
  padding: 12px 12px 10px 16px;
  border-right: 1px solid var(--grid-strong);
  min-width: 0;
}
.band-title {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  font-stretch: 80%;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
}
.band-total { margin: 6px 0 0; font-size: 13px; color: var(--ink-2); }
.band-total .num { font-size: 22px; font-weight: 700; color: var(--ink); margin-right: 2px; }
.band-nav { display: flex; align-items: center; gap: 2px; margin-top: auto; }
.band-pos { font: 12px/1 var(--font-code); color: var(--ink); margin-right: auto; white-space: nowrap; }

.cells {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(96px, 1fr);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}
.cells::-webkit-scrollbar { display: none; }

.cell {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  padding: 11px 10px 10px 12px;
  border: 0;
  border-right: 1px solid var(--grid);
  background: var(--paper);
  text-align: left;
  scroll-snap-align: start;
  transition: background-color 120ms steps(2, end), color 120ms steps(2, end);
}
.cell-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  font-stretch: 78%;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--blue);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.cell-label svg { width: 13px; height: 13px; flex: none; }
.cell-num {
  margin-top: 2px;
  font-size: 28px;
  line-height: 34px;
  font-weight: 700;
  color: var(--ink);
}
.cell-dots {
  display: grid;
  grid-template-columns: repeat(16, 4px);
  gap: 2px;
  margin-top: auto;
}
.cell-dots i { display: block; width: 4px; height: 4px; background: var(--grid-strong); }
.cell-dots i.on { background: var(--blue); }
.cell-sub { margin-top: auto; font-size: 11.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }

.cell:hover:not(:disabled) { background: var(--surface); }
.cell[aria-pressed="true"] { background: var(--blue); }
.cell[aria-pressed="true"] .cell-label,
.cell[aria-pressed="true"] .cell-num { color: var(--on-blue); }
.cell[aria-pressed="true"] .cell-dots i { background: color-mix(in srgb, var(--on-blue) 30%, transparent); }
.cell[aria-pressed="true"] .cell-dots i.on { background: var(--on-blue); }
.cell:disabled .cell-label { color: var(--faint); }
.cell:disabled .cell-num { color: var(--faint); font-weight: 400; }
.cell:focus-visible { outline-offset: -3px; }

.cell-notes { border-left: 1px solid var(--grid-strong); border-right: 0; }
.cell-notes.has-notes .cell-label { color: var(--signal); }
.cell-notes.has-notes { background: var(--signal-wash); }
.cell-notes.has-notes:hover { background: color-mix(in srgb, var(--signal) 14%, var(--paper)); }

/* ------------------------------------------------------------------ status bar */

.status {
  grid-area: status;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 16px;
  border-top: 1px solid var(--grid-strong);
  background: var(--surface);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
}
.st { display: inline; }
#st-mode { display: inline-flex; align-items: center; gap: 6px; }
.st-grow { margin-right: auto; }
.st .num, .st-num { font-family: var(--font-code); font-size: 11.5px; color: var(--ink-2); }
.st-dot { width: 7px; height: 7px; background: var(--faint); }
.is-live .st-dot { background: var(--blue); }
.is-live #st-mode-text { color: var(--blue); font-weight: 600; }
.st-hint kbd { color: var(--ink-2); }

/* ------------------------------------------------------------------ sheets (dialogs) */

/* Sheets are non-modal and docked below the top bar, so Convert, Copy and
   the pane they don't cover stay live. Rules docks left, over the Markdown. */
.sheet {
  position: fixed;
  z-index: 30;
  top: 56px;
  bottom: 0;
  right: 0;
  left: auto;
  margin: 0;
  padding: 0;
  width: min(460px, 100vw);
  max-width: 100vw;
  height: auto;
  max-height: none;
  border: 0;
  border-left: 1px solid var(--blue);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
}
.sheet-left { left: 0; right: auto; border-left: 0; border-right: 1px solid var(--blue); }
.sheet-narrow { width: min(400px, 100vw); }
.sheet[open] { animation: sheet-in 220ms var(--ease-out); }
.sheet-left[open] { animation-name: sheet-in-left; }
@keyframes sheet-in { from { transform: translateX(24px); opacity: 0; } }
@keyframes sheet-in-left { from { transform: translateX(-24px); opacity: 0; } }

.sheet-inner { display: flex; flex-direction: column; height: 100%; margin: 0; }
.sheet-head {
  position: relative;
  padding: 18px 64px 16px 24px;
  border-bottom: 1px solid var(--grid-strong);
  flex: none;
}
.sheet-head h2 { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.sheet-head p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.sheet-close { position: absolute; top: 14px; right: 14px; }
.sheet-body { flex: 1; overflow: auto; padding: 4px 0 24px; }
.sheet-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 24px;
  border-top: 1px solid var(--grid-strong);
  background: var(--surface);
  flex: none;
}

.rule-group { padding: 16px 24px 4px; }
.rule-group + .rule-group { border-top: 1px solid var(--grid); }
.rule-group h3 {
  margin: 0 0 6px;
  font-size: 11.5px;
  font-weight: 700;
  font-stretch: 80%;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
}
.rule {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 16px;
  padding: 10px 0;
}
.rule + .rule { border-top: 1px solid var(--grid); }
.rule-name { font-weight: 600; font-size: 14px; }
.rule-desc { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.45; max-width: 52ch; }
.rule-desc code { font: 12px var(--font-code); color: var(--ink-2); }
.rule select {
  appearance: none;
  height: 32px;
  min-width: 150px;
  padding: 0 30px 0 10px;
  border: 1px solid var(--grid-strong);
  border-radius: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink) 50%),
    linear-gradient(-45deg, transparent 50%, var(--ink) 50%);
  background-position: calc(100% - 15px) 14px, calc(100% - 10px) 14px;
  background-size: 5px 5px;
  background-repeat: no-repeat;
  font-size: 13px;
}
.rule select:hover { border-color: var(--ink); }
.rule .switch { height: 28px; }
.rule.is-changed .rule-name::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 8px;
  vertical-align: 2px;
  background: var(--blue);
}

.notes-list { list-style: none; margin: 0; padding: 8px 0; overflow: auto; flex: 1; }
.notes-list li { padding: 12px 24px; border-bottom: 1px solid var(--grid); display: grid; grid-template-columns: 56px 1fr; gap: 12px; align-items: baseline; }
.notes-list .note-line { font: 12px var(--font-code); color: var(--blue); }
.notes-list button.note-line { border: 0; background: none; padding: 0; text-align: left; text-decoration: underline; text-underline-offset: 3px; }
.notes-list .note-text { font-size: 13.5px; line-height: 1.45; }

.keys { width: 100%; border-collapse: collapse; margin: 4px 0; }
.keys td { padding: 10px 24px; border-bottom: 1px solid var(--grid); font-size: 13.5px; }
.keys td:last-child { text-align: right; white-space: nowrap; }
.keys kbd {
  display: inline-block;
  min-width: 24px;
  padding: 4px 6px 3px;
  border: 1px solid var(--grid-strong);
  border-bottom-width: 2px;
  text-align: center;
  color: var(--ink);
  background: var(--surface);
}
.keys kbd + kbd { margin-left: 4px; }

/* ------------------------------------------------------------------ toast */

.toast {
  position: fixed;
  left: 50%;
  bottom: 148px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: calc(100vw - 32px);
  padding: 10px 16px 10px 10px;
  background: var(--ink);
  color: var(--paper);
  box-shadow: var(--shadow);
  font-size: 13.5px;
  transform: translateX(-50%);
  animation: toast-in 200ms var(--ease-out);
}
.toast svg { width: 22px; height: 22px; padding: 3px; background: var(--blue); color: var(--on-blue); flex: none; }
.toast .link-btn { color: var(--paper); }
@keyframes toast-in { from { transform: translate(-50%, 8px); opacity: 0; } }

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

@media (max-width: 1180px) {
  .brand-sub { display: none; }
  .btn-kbd { display: none; }
  .band { grid-template-columns: 156px minmax(0, 1fr) 116px; }
}

@media (max-width: 960px) {
  .top { gap: 10px; }
  .field select { min-width: 140px; }
  #rules-open .btn-label, .pane-out .pane-title, #download span {
    position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
  }
  .pane-head { gap: 12px; }
  .seg label > span { padding: 0 10px; }
}

@media (max-width: 820px) {
  .app {
    grid-template-rows: 52px 44px minmax(0, 1fr) 0 0;
    grid-template-areas: "top" "tabs" "work" "band" "status";
    padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px));
  }
  .top { padding: 0 8px 0 12px; }
  .brand-word { width: 66px; }
  .examples { flex: 1; min-width: 0; }
  .field select { min-width: 0; width: 100%; height: 34px; }
  .top-actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10;
    margin: 0;
    gap: 6px;
    height: calc(60px + env(safe-area-inset-bottom, 0px));
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom, 0px));
    border-top: 1px solid var(--blue);
    background: var(--paper);
  }
  .top-actions .btn-primary { margin-left: auto; height: 40px; }
  .top-actions .btn-outline { height: 40px; }
  #copy .btn-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  #copy { padding: 0 11px; }
  .top-icons { border-left: 0; padding-left: 0; }
  #keys-open { display: none; }

  .tabs {
    grid-area: tabs;
    display: flex;
    align-items: center;
    padding: 0 12px;
    border-bottom: 1px solid var(--grid-strong);
  }
  .tabs .seg { width: 100%; height: 30px; }
  .tabs .seg button { flex: 1; justify-content: center; }
  .tab-count { font: 11px var(--font-code); color: inherit; opacity: 0.85; }

  .work { grid-template-columns: minmax(0, 1fr); }
  .pane-in { border-right: 0; }
  .app[data-tab="in"] .pane-out,
  .app[data-tab="out"] .pane-in,
  .app[data-tab="band"] .pane-in,
  .app[data-tab="band"] .pane-out { display: none; }
  .app[data-tab="band"] .work { display: none; }

  .band { display: none; }
  .app[data-tab="band"] {
    grid-template-rows: 52px 44px 0 minmax(0, 1fr) 0;
  }
  .app[data-tab="band"] .band {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    align-content: start;
    height: auto;
    overflow: auto;
    border-top: 0;
  }
  .app[data-tab="band"] .band-lead { border-right: 0; border-bottom: 1px solid var(--grid-strong); padding: 16px; }
  .app[data-tab="band"] .cells {
    grid-auto-flow: row;
    grid-template-columns: repeat(auto-fill, minmax(116px, 1fr));
    overflow: visible;
  }
  .app[data-tab="band"] .cell { min-height: 100px; border-bottom: 1px solid var(--grid); }
  .app[data-tab="band"] .cell-notes { border-left: 0; min-height: 88px; }

  .status { display: none; }
  .pane-head { padding-left: 12px; gap: 10px; }
  :root { --gut: 40px; }
  .ln { padding-right: 10px; padding-left: calc(var(--gut) + 8px); }
  .ed-input { padding-right: 10px; padding-left: calc(var(--gut) + 8px); }
  .preamble { flex-wrap: wrap; gap: 4px 12px; }
  .preamble-list { white-space: normal; flex: 1 1 100%; order: 3; }
  .toast { bottom: calc(76px + env(safe-area-inset-bottom, 0px)); }
  .sheet, .sheet-left {
    top: 52px;
    bottom: calc(60px + env(safe-area-inset-bottom, 0px));
    width: 100vw;
    border-left: 0;
    border-right: 0;
    box-shadow: none;
  }
}

@media (max-width: 480px) {
  .meta-words { display: none; }
}

@media (max-width: 400px) {
  #rules-open { padding: 0 8px; }
  .top-actions { gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}