/*
 * Tokens are assigned three times on purpose — once for the system default, once for each
 * pinned scheme — rather than through `light-dark()`, which is newer than the oldest
 * browser worth being able to open this in. The default branch is the media query, so a
 * page whose JS never ran still follows the system.
 */
:root {
  --paper-l: #fcfcfb;
  --paper-d: #101214;
  --panel-l: #f2f2ef;
  --panel-d: #181b1e;
  --cell-l: #ffffff;
  --cell-d: #16191c;
  --ink-l: #16181a;
  --ink-d: #e9e9e6;
  --dim-l: #6a7076;
  --dim-d: #8d949b;
  --line-l: #e3e3de;
  --line-d: #2a2f34;
  --accent-l: #1d6b52;
  --accent-d: #6fcaa4;
  --warn-bg-l: #fdf6e6;
  --warn-bg-d: #241f12;
  --warn-line-l: #e8d9a8;
  --warn-line-d: #4a3f22;

  --paper: var(--paper-l);
  --panel: var(--panel-l);
  --cell: var(--cell-l);
  --ink: var(--ink-l);
  --dim: var(--dim-l);
  --line: var(--line-l);
  --accent: var(--accent-l);
  --warn-bg: var(--warn-bg-l);
  --warn-line: var(--warn-line-l);

  color-scheme: light dark;
  accent-color: var(--accent);

  --glyph-bg: transparent;
  --glyph-size: 48px;
  --glyph-fill: currentColor;
  --flag-opacity: 1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: var(--paper-d);
    --panel: var(--panel-d);
    --cell: var(--cell-d);
    --ink: var(--ink-d);
    --dim: var(--dim-d);
    --line: var(--line-d);
    --accent: var(--accent-d);
    --warn-bg: var(--warn-bg-d);
    --warn-line: var(--warn-line-d);
  }
}

:root[data-scheme='light'] {
  color-scheme: light;
  --paper: var(--paper-l);
  --panel: var(--panel-l);
  --cell: var(--cell-l);
  --ink: var(--ink-l);
  --dim: var(--dim-l);
  --line: var(--line-l);
  --accent: var(--accent-l);
  --warn-bg: var(--warn-bg-l);
  --warn-line: var(--warn-line-l);
}

:root[data-scheme='dark'] {
  color-scheme: dark;
  --paper: var(--paper-d);
  --panel: var(--panel-d);
  --cell: var(--cell-d);
  --ink: var(--ink-d);
  --dim: var(--dim-d);
  --line: var(--line-d);
  --accent: var(--accent-d);
  --mark-a: var(--mark-a-d);
  --mark-b: var(--mark-b-d);
  --warn-bg: var(--warn-bg-d);
  --warn-line: var(--warn-line-d);
}

* {
  box-sizing: border-box;
}

/* An author `display` beats the UA stylesheet's `[hidden] { display: none }`, so anything
   given one below would ignore the attribute without this. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  padding: 0 clamp(12px, 3vw, 32px) 64px;
  background: var(--paper);
  color: var(--ink);
  font:
    14px/1.5 ui-sans-serif,
    system-ui,
    sans-serif;
}

code,
pre,
.mono {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
}

/* Header ------------------------------------------------------------------ */

.bar {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding: 24px 0 16px;
}
.bar h1 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.01em;
}
/* Sized in em so the mark tracks the word it sits beside. */
.mark {
  width: 1.15em;
  height: 1.15em;
  flex: none;
}
.tagline {
  margin: 0;
  color: var(--dim);
  flex: 1 1 20ch;
}

.ghost {
  font: inherit;
  color: var(--ink);
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
.ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Drawn rather than fetched: two paths, stroked in the button's own colour. */
.ghost.icon {
  padding: 5px;
  line-height: 0;
}
.ghost.icon svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Settings ---------------------------------------------------------------- */

.panel {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 12px 20px;
  padding: 14px 16px;
  margin-bottom: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.field > label,
.field > .legend {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}
.field.wide {
  flex: 1 1 240px;
}
.pair {
  display: flex;
  align-items: center;
  gap: 8px;
}
.pair input[type='range'] {
  flex: 1 1 120px;
  min-width: 90px;
}

.panel input[type='text'],
.panel input[type='search'],
.panel select {
  font:
    13px/1.4 ui-monospace,
    'SF Mono',
    Menlo,
    monospace;
  color: var(--ink);
  background: var(--cell);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 7px;
}
.panel select {
  font-family: inherit;
  font-size: 13px;
}
.panel input:user-invalid,
.panel input[aria-invalid='true'] {
  border-color: #c0392b;
}

.checks {
  gap: 6px;
}
.checks label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0;
  cursor: pointer;
}
.checks code {
  font-size: 12px;
}

.count {
  margin: 0 0 0 auto;
  color: var(--dim);
  font-size: 12px;
  white-space: nowrap;
}

.advice {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: -12px 0 24px;
  padding: 10px 14px;
  font-size: 13px;
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 8px;
}
.advice b {
  font-family: ui-monospace, Menlo, monospace;
  font-weight: 600;
}
.advice .ghost {
  margin-inline-start: auto;
  white-space: nowrap;
}
.ghost.tiny {
  padding: 3px 7px;
  font-size: 12px;
}

#probe {
  position: absolute;
  visibility: hidden;
  pointer-events: none;
  width: var(--glyph-size);
  height: 0;
}

/* Specimen ---------------------------------------------------------------- */

.specimen {
  margin: 0 0 28px;
  max-width: 62ch;
}
.specimen h2 {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  font-weight: 600;
}
.specimen h2 code {
  text-transform: none;
  letter-spacing: 0;
}
#specimen {
  margin: 0;
  font-size: 17px;
  line-height: 1.7;
}
#specimen svg {
  vertical-align: -0.14em;
  margin-inline: 0.08em;
}
#specimen .rest {
  color: var(--dim);
  font-size: 0.8em;
}
.note {
  color: var(--dim);
  font-size: 12.5px;
  margin: 8px 0 0;
}

/* Grid -------------------------------------------------------------------- */

#grid {
  display: grid;
  /* Tracks widen with the glyph, so a 160px setting does not overflow a 108px cell.
     `clamp` keeps it sane if the size is typed rather than dragged. */
  grid-template-columns: repeat(
    auto-fill,
    minmax(clamp(6.5rem, calc(var(--glyph-size) + 2.75rem), 18rem), 1fr)
  );
  gap: 8px;
}
.loading {
  grid-column: 1 / -1;
  color: var(--dim);
}

.cell {
  /* Containment, so re-rendering or filtering the grid reflows a cell and not the page.
     The intrinsic size is a placeholder for the cells that are skipped while offscreen. */
  content-visibility: auto;
  contain-intrinsic-size: auto 7rem auto 8rem;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: end;
  gap: 6px;
  min-height: calc(var(--glyph-size) + 4.5rem);
  padding: 12px 6px 8px;
  font: inherit;
  color: var(--ink);
  background: var(--glyph-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
}
@supports not (content-visibility: auto) {
  .cell {
    contain: layout style paint;
  }
}
.cell:hover {
  border-color: var(--accent);
}
.cell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cell .art {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 auto;
}
.cell .code {
  font:
    11px ui-monospace,
    Menlo,
    monospace;
  letter-spacing: 0.09em;
  color: var(--dim);
}
.cell .missing {
  font-size: 11px;
  color: var(--dim);
}
.cell .name {
  font-size: 11px;
  line-height: 1.25;
  color: var(--dim);
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* The live knobs. CSS beats a presentation attribute, so these paint exactly what the
   same values passed to `toSvg` would — without re-serialising 242 outlines per frame. */
#grid svg {
  width: var(--glyph-size);
  height: var(--glyph-size);
}
#grid .geoglyph-shape,
#specimen .geoglyph-shape {
  fill: var(--glyph-fill);
}
#grid .geoglyph-flag,
#specimen .geoglyph-flag {
  opacity: var(--flag-opacity);
  transition: opacity 150ms;
}
/* Both sides of this carry the id, or the reveal loses to the rule above it. */
#grid .cell:hover .geoglyph-flag,
#specimen svg:hover .geoglyph-flag {
  opacity: 1;
}
#grid img.flag {
  height: var(--glyph-size);
  width: auto;
  max-width: 100%;
}

/* Detail ------------------------------------------------------------------ */

#detail {
  width: min(720px, calc(100vw - 32px));
  max-height: min(80vh, 720px);
  margin: auto;
  padding: 20px 24px 24px;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: auto;
  overscroll-behavior: contain;
}
#detail::backdrop {
  background: rgb(0 0 0 / 0.4);
}
#detail .close {
  position: sticky;
  top: 0;
  float: inline-end;
  font-size: 16px;
  line-height: 1;
}

.detail-head {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.detail-head h2 {
  margin: 0;
  font-size: 18px;
}
.detail-head .code {
  color: var(--dim);
  font:
    12px ui-monospace,
    Menlo,
    monospace;
  letter-spacing: 0.09em;
}
.previews {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--accent);
}
.previews figure {
  margin: 0;
  text-align: center;
}
.previews figcaption {
  font-size: 11px;
  color: var(--dim);
  margin-top: 4px;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.facts li {
  font-size: 12px;
  color: var(--dim);
}
.facts b {
  font-weight: 600;
  color: var(--ink);
  font-family: ui-monospace, Menlo, monospace;
}

.costs {
  margin: 14px 0 0;
  border-collapse: collapse;
  font-size: 12.5px;
}
.costs caption {
  text-align: start;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  padding-bottom: 5px;
}
.costs th {
  text-align: start;
  font-weight: 400;
  color: var(--dim);
  padding: 3px 18px 3px 0;
}
.costs td {
  text-align: end;
  padding: 3px 0 3px 18px;
  font-family: ui-monospace, Menlo, monospace;
  font-variant-numeric: tabular-nums;
}
.costs td:last-child {
  color: var(--dim);
}
.costs b {
  color: var(--ink);
}

.snippet {
  margin: 18px 0 0;
}
.snippet-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 5px;
}
.snippet-head span {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}
.snippet pre {
  margin: 0;
  padding: 10px 12px;
  max-height: 220px;
  overflow: auto;
  background: var(--cell);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
  tab-size: 2;
}

/* Colophon ---------------------------------------------------------------- */

.colophon {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 12.5px;
}
.colophon p {
  margin: 0;
}
.colophon a {
  color: var(--dim);
}
.colophon a:hover {
  color: var(--accent);
}
.colophon__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.05em;
  text-decoration: none;
  white-space: nowrap;
}
/* The mark ships cream-on-black, which is invisible on a light page. A filter is cheaper
   than a second asset and keeps it a single file shared with the site it points at. */
.colophon__brand img {
  height: 1.15em;
  width: auto;
  align-self: center;
}
:root[data-scheme='light'] .colophon__brand img,
:root:not([data-scheme='dark']) .colophon__brand img {
  filter: invert(1);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-scheme='light']) .colophon__brand img {
    filter: none;
  }
}

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