:root {
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --paper: #fafaf9;
  --side-0: #57534e;
  --side-1: #c2410c;
  --cold: #f5f5f4;
  --hot: #7c2d12;
  font-family: system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

body {
  margin: 0;
}

main {
  max-width: 60rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

h2 {
  font-size: 1.1rem;
  margin: 2.5rem 0 0.75rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: end;
  margin-top: 2rem;
}

.source {
  border: 0;
  padding: 0;
  margin: 0;
  flex: 1 1 24rem;
}

.source legend,
.layout-picker span {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.segments {
  display: inline-flex;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  overflow: hidden;
}

.segment {
  flex: 1 1 auto;
  min-width: 0;
  text-align: center;
}

.segment input {
  position: absolute;
  opacity: 0;
}

.segment span {
  display: block;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  background: white;
}

.segment + .segment span {
  border-left: 1px solid var(--line);
}

.segment input:checked + span {
  background: var(--ink);
  color: white;
}

/* Inset: .segments clips anything drawn outside its border. */
.segment input:focus-visible + span {
  outline: 2px solid var(--side-1);
  outline-offset: -2px;
}

select:focus-visible,
textarea:focus-visible,
.reset:focus-visible {
  outline: 2px solid var(--side-1);
  outline-offset: 2px;
}

textarea {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 0.75rem;
  padding: 0.6rem;
  font: inherit;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

.layout-picker {
  display: flex;
  align-items: end;
  gap: 0.5rem;
}

.layout-picker label {
  display: flex;
  flex-direction: column;
}

.reset[aria-disabled="true"] {
  color: var(--muted);
  cursor: default;
}

.reset {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: white;
  cursor: pointer;
}

select {
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: white;
}

.status {
  margin-top: 2rem;
  color: var(--muted);
}

.status.error {
  color: #b91c1c;
}

/* Shared two-column grid, so pickers, scores, and keyboards line up per side. */
.columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.sides {
  margin-top: 1.5rem;
}

.side {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.score {
  /* Fills the column, so both cards match even when only one shows a change. */
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  background: white;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
}

.score-name {
  color: var(--muted);
  font-size: 0.9rem;
}

.score-value {
  font-size: 2.25rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.score-change {
  color: var(--side-1);
  font-weight: 600;
}

.meta {
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.keyboard {
  margin: 0;
}

.keyboard figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.keys {
  display: grid;
  /* minmax(0, …): plain 1fr will not shrink below the key labels, which
     pushes the keyboard past narrow screens. */
  grid-template-columns: repeat(5, minmax(0, 1fr)) minmax(0, 0.4fr) repeat(6, minmax(0, 1fr));
  gap: 0.25rem;
}

.key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  border-radius: 0.35rem;
  background: color-mix(in oklab, var(--hot) calc(var(--heat) * 100%), var(--cold));
  color: black;
  font-variant-numeric: tabular-nums;
}

.key.thumb {
  aspect-ratio: auto;
}

button.key {
  border: 0;
  padding: 0;
  font: inherit;
  cursor: pointer;
}

button.key:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

/* Inset paper ring inside an accent ring: reads on cold and hot keys alike, and
   the focus outline outside the key never covers it. */
.key.selected {
  box-shadow: inset 0 0 0 2px var(--side-1), inset 0 0 0 4px var(--paper);
}

.hint {
  margin: -0.5rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.key.hot {
  color: white;
}

.key-char {
  font-weight: 600;
  font-size: 0.95rem;
}

.key-share {
  font-size: 0.7rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.data-table thead th {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.data-table tbody + tbody tr:first-child > * {
  border-top: 2px solid var(--line);
}

.data-table.numeric td {
  text-align: right;
}

.data-table.numeric thead th:not(:first-child) {
  text-align: right;
}

.bar-cell {
  width: 40%;
}

.bar-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bar-track {
  flex: 1;
}

.bar {
  display: block;
  height: 0.6rem;
  border-radius: 0.3rem;
}

.bar.side-0 {
  background: var(--side-0);
}

.bar.side-1 {
  background: var(--side-1);
}

.bar-value {
  flex: 0 0 3.5rem;
  font-size: 0.85rem;
}

@media (max-width: 48rem) {
  .columns {
    grid-template-columns: 1fr;
  }

  .segment span {
    padding: 0.45rem 0.55rem;
  }
}