@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-latin-500-normal.woff2') format('woff2');
}

:root {
  --bg: #FAFAF8;
  --fg: #17181A;
  --cell: 8px;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  /* #5C6166 measures 5.99:1 on --bg, clearing the 4.5:1 floor it is used
     at (captions, footer text) -- see scripts/contrast-check.sh. */
  --muted: #5C6166;
  --rule: rgba(23, 24, 26, 0.15);

  /* State colors -- the Nagios exit-code vocabulary (OK/WARNING/CRITICAL/
     UNKNOWN/PENDING), never the board's wood tones. Rule: a state is never
     carried by color alone -- always the color AND the word, set in the
     mono face. The transcript, the diagram and the status table all sit on
     the page ground, so the tokens are per-theme: this set clears 4.5:1 on
     paper, the dark overrides clear 4.5:1 on graphite -- see
     scripts/contrast-check.sh. */
  --jq-state-ok: #14764F;
  --jq-state-warning: #8A5A00;
  --jq-state-critical: #C8102C;
  --jq-state-unknown: #6D3FD6;
  --jq-state-pending: #5A6675;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101214;
    --fg: #E8EAED;
    /* #9AA0A6 measures 7.11:1 on --bg -- see scripts/contrast-check.sh. */
    --muted: #9AA0A6;
    --rule: rgba(232, 234, 237, 0.15);
    --jq-state-ok: #259563;
    --jq-state-warning: #B57515;
    --jq-state-critical: #EF3E58;
    --jq-state-unknown: #916AEE;
    --jq-state-pending: #75849B;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.55;
  /* An RFC page is 72 columns of monospace; 72ch plus the 3ch body indent
     and a little air. ch here tracks the mono face the whole page is set
     in, so the widest pre (the status table, 72 chars) exactly fits. */
  max-width: calc(76ch + 2rem);
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

a:hover {
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

code {
  font-family: inherit;
}

/* Document header: RFC letterhead -- metadata left, mark and date right,
   then the centered title block. */
.meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.meta p {
  margin: 0;
  line-height: 1.7;
}

.meta-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
}

.meta-right .rook {
  margin-bottom: 0.75rem;
}

h1 {
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  letter-spacing: 0.01em;
  margin: 3rem 0 0.75rem;
}

.subtitle,
.tagline {
  text-align: center;
  margin: 0;
  color: var(--muted);
}

.tagline {
  margin-top: 1.5rem;
  color: var(--fg);
}

h2 {
  font-size: inherit;
  font-weight: 500;
  margin: 3rem 0 1rem;
}

h3 {
  font-size: inherit;
  font-weight: 500;
  margin: 2rem 0 1rem 0;
}

section {
  margin: 0;
}

/* RFC body text is indented three columns under its heading. */
main p,
main pre,
main ul {
  margin-left: 3ch;
}

main p {
  max-width: 72ch;
  margin-top: 0;
  margin-bottom: 1rem;
}

main pre {
  font-family: inherit;
  font-size: inherit;
  line-height: 1.55;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  overflow-x: auto;
}

pre.toc {
  margin-left: 0;
  margin-top: 0;
}

pre.toc a {
  text-decoration: none;
}

pre.toc a:hover {
  background: var(--fg);
  color: var(--bg);
}

/* Figure captions: centered and muted, RFC-style. */
.fig {
  text-align: center;
  color: var(--muted);
  max-width: none;
  margin: 0 0 2rem;
}

.state.ok {
  color: var(--jq-state-ok);
}

.state.critical {
  color: var(--jq-state-critical);
}

.state.warning {
  color: var(--jq-state-warning);
}

.state.unknown {
  color: var(--jq-state-unknown);
}

.state.pending {
  color: var(--jq-state-pending);
}

/* The replay: lines are visible by default (the static page and the
   finished state are the same thing); while a replay runs the terminal
   carries .playing and lines appear as the player reveals them. */
pre.terminal.playing .line {
  opacity: 0;
}

pre.terminal.playing .line.show {
  opacity: 1;
}

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  margin-left: 1px;
  background: currentColor;
  vertical-align: text-bottom;
  animation: cursor-blink 1s steps(1) infinite;
}

@keyframes cursor-blink {
  50% {
    opacity: 0;
  }
}

.replay-again {
  font: inherit;
  color: var(--muted);
  background: none;
  border: none;
  padding: 0;
  margin-left: 1ch;
  cursor: pointer;
}

.replay-again:hover {
  background: var(--fg);
  color: var(--bg);
}

.rook {
  display: grid;
  grid-template-columns: repeat(7, var(--cell));
  grid-template-rows: repeat(7, var(--cell));
  gap: 1px;
  flex: none;
}

.c {
  width: var(--cell);
  height: var(--cell);
  background: transparent;
  border-radius: 0;
}

.c.on {
  background: var(--fg);
}

footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.rook-sm {
  --cell: 6px;
}

.footer-word {
  font-weight: 500;
  margin: 0;
}

.ipa {
  color: var(--muted);
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
}

.footer-group h2 {
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.footer-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-group li {
  margin: 0.25rem 0;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
}

.footer-bottom p {
  margin: 0;
}

/* 404.html shares this stylesheet and the letterhead structure; its .links
   strip is the one element of its own. */
.links {
  margin: 2rem 0;
  text-align: center;
}

@media (max-width: 560px) {
  body {
    font-size: 0.8125rem;
  }

  .meta {
    flex-direction: column-reverse;
    gap: 1.25rem;
  }

  .meta-right {
    align-items: flex-start;
    text-align: left;
  }

  h1 {
    margin-top: 2rem;
  }
}