/* Palette on :root, redefined once for dark. Nothing else names a colour. */
:root {
  color-scheme: light dark;
  --page: #fbfaf8;
  --panel: #ffffff;
  --ink: #1b1a18;
  --faint: #6d6a63;
  --line: #ddd8cf;
  --accent: #7a3b12;
  --bad: #a11b1b;
  --good: #1f6b32;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #17161a;
    --panel: #1e1d22;
    --ink: #e8e5e0;
    --faint: #9b968d;
    --line: #33313a;
    --accent: #e0a06a;
    --bad: #f08a8a;
    --good: #86d29b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.5rem clamp(1rem, 4vw, 3rem) 2rem;
  background: var(--page);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
}

header {
  max-width: 62rem;
}
h1 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}
header p {
  margin: 0.4rem 0 0;
  color: var(--faint);
  max-width: 58rem;
}
a {
  color: var(--accent);
}

.bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 1.2rem 0 0.8rem;
}
.bar label {
  color: var(--faint);
  font-size: 0.85rem;
}

select,
button {
  font: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.32rem 0.7rem;
}
button {
  cursor: pointer;
}
button:hover:not(:disabled) {
  border-color: var(--accent);
}
button:disabled,
select:disabled {
  opacity: 0.5;
  cursor: default;
}
#run-button {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}
.quiet {
  color: var(--faint);
}

#status {
  color: var(--faint);
  font-size: 0.85rem;
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}
#status.bad {
  color: var(--bad);
}
#status.good {
  color: var(--good);
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}
@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
  }
}

.pane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 7px;
  overflow: hidden;
  min-width: 0;
}
.pane h2 {
  margin: 0;
  padding: 0.5rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
  border-bottom: 1px solid var(--line);
}

textarea {
  display: block;
  width: 100%;
  height: 30rem;
  border: 0;
  padding: 0.8rem;
  resize: vertical;
  background: transparent;
  color: var(--ink);
  font: 13px/1.6 var(--mono);
  tab-size: 2;
}
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.tabs button {
  border: 0;
  border-radius: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--faint);
  padding: 0.5rem 0.85rem;
  font-size: 0.85rem;
  white-space: nowrap;
}
.tabs button[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.view {
  margin: 0;
  padding: 0.8rem;
  height: 30rem;
  overflow: auto;
  font: 13px/1.6 var(--mono);
  white-space: pre;
}

#errors {
  margin: 0;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--line);
  color: var(--bad);
  font: 13px/1.5 var(--mono);
  white-space: pre-wrap;
}

footer {
  margin-top: 1.2rem;
  color: var(--faint);
  font-size: 0.85rem;
}
footer p {
  margin: 0;
  max-width: 62rem;
}
kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 0.3rem;
  font: 0.85em var(--mono);
}


/* ---------------------------------------------------------- help pages */

body.prose {
  max-width: 52rem;
  margin: 0 auto;
}
body.prose main {
  display: block;
}
h1.plain::after {
  content: none;
}
nav {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

body.prose h2 {
  margin: 2rem 0 0.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 1.1rem;
}
body.prose h3 {
  margin: 1.4rem 0 0.4rem;
  font-size: 0.95rem;
}
body.prose p,
body.prose dd {
  max-width: 46rem;
}
body.prose dt {
  margin-top: 0.7rem;
  font: 13px/1.5 var(--mono);
}
body.prose dd {
  margin: 0.2rem 0 0 1.4rem;
}

code {
  font: 0.9em var(--mono);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 0.25em;
}
pre {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.8rem;
  overflow-x: auto;
  font: 13px/1.6 var(--mono);
}
pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 1em;
}

table {
  border-collapse: collapse;
  margin: 0.6rem 0;
  font-size: 0.9rem;
}
th,
td {
  text-align: left;
  padding: 0.25rem 1.2rem 0.25rem 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  color: var(--faint);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.note {
  border-left: 3px solid var(--accent);
  padding-left: 0.8rem;
  color: var(--faint);
}
.derived {
  font: 0.65em var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.1em 0.55em;
  vertical-align: 0.3em;
}
.words code {
  margin-right: 0.15rem;
  line-height: 2;
}

/* The language switch sits apart from the section links beside it. */
nav a.switch {
  margin-left: auto;
  color: var(--faint);
}