/* Baseline chrome for the site. The design pass (backlog item 2) refines this. */
:root {
  --paper: #f5efe2;
  --paper-2: #ece4d2;
  --ink: #1f1b16;
  --ink-2: #4a423a;
  --rule: #b9ae98;
  --hair: #7d7360;
  --red: #b5322a;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, Menlo, Consolas, monospace;
  --measure: 68ch;
}
* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); }
body { margin: 0; font-family: var(--serif); font-size: 17px; line-height: 1.55; }
a { color: var(--red); text-decoration: none; }
a:hover { text-decoration: underline; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* sticky header */
.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--paper); border-bottom: 1px solid var(--hair); }
.top .book { color: var(--ink); font-size: 15px; letter-spacing: .01em; white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; flex: 1 1 0; min-width: 0; }
.top .picker { flex: 0 0 auto; width: min(46vw, 260px); }
.top select { width: 100%; font: 13px var(--sans); padding: 5px 6px; background: var(--paper-2);
  color: var(--ink); border: 1px solid var(--hair); border-radius: 3px; }

/* frame: single column; sidebar above 1000px */
.frame { display: block; }
.side { display: none; }
main { padding: 0 16px 48px; }
article { max-width: var(--measure); }
@media (min-width: 1000px) {
  .frame { display: grid; grid-template-columns: 16rem minmax(0, 1fr); gap: 32px; padding: 0 24px; }
  .side { display: block; position: sticky; top: 50px; align-self: start; max-height: calc(100vh - 50px);
    overflow-y: auto; padding: 24px 0 24px; border-right: 1px solid var(--rule); font-family: var(--sans); font-size: 13.5px; }
  .side ol { list-style: none; margin: 0; padding: 0 12px 0 0; }
  .side li a { display: flex; gap: 10px; padding: 5px 6px; color: var(--ink-2); border-radius: 2px; line-height: 1.3; }
  .side li a .n { flex: 0 0 1.6em; text-align: right; color: var(--hair); font-variant-numeric: tabular-nums; }
  .side li.current a { color: var(--ink); background: var(--paper-2); }
  .side li.current a .n { color: var(--red); }
  .side li a:hover { text-decoration: none; color: var(--ink); }
  .top .picker { display: none; }
  main { padding: 0 0 64px; }
}

/* prev/next */
.pager { display: grid; grid-template-columns: 1fr auto 1fr; align-items: baseline; gap: 12px;
  padding: 14px 0; font-family: var(--sans); font-size: 13.5px; color: var(--ink-2); }
.pager .next { text-align: right; }
.pager .where { color: var(--hair); white-space: nowrap; }
.pager .where b { font-weight: 600; color: var(--ink-2); }
.pager a { color: var(--ink); }
.pager .arrow { color: var(--red); }
main > .pager:first-child { border-bottom: 1px solid var(--rule); }
main > .pager:last-child { border-top: 1px solid var(--rule); margin-top: 32px; }

/* chapter opener */
.opener { margin: 28px 0 28px; }
.opener .chlabel { display: block; font: 13px var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--hair); }
.opener .chnum { display: block; font-size: 84px; line-height: 1; color: var(--red); margin: 4px 0 6px; font-variant-numeric: lining-nums; }
.opener h1 { font-size: 30px; line-height: 1.15; font-weight: 400; margin: 0 0 8px; }
.opener .summary { margin: 0; color: var(--ink-2); font-style: italic; }
.opener.cover h1 { font-size: 36px; }
.opener.cover .subtitle { font-size: 19px; margin: 6px 0 12px; color: var(--ink-2); }
.opener.cover .byline { font-family: var(--sans); font-size: 13.5px; color: var(--hair); margin: 0; }

/* text */
h2 { font-size: 22px; font-weight: 400; line-height: 1.25; margin: 40px 0 10px; padding-top: 10px; border-top: 1px solid var(--rule); }
h3 { font-size: 18px; font-weight: 600; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 1em; }
li { margin: 0 0 .3em; }
li.todo, li.done { list-style: none; margin-left: -1.4em; }
li .box { display: inline-block; width: 1em; height: 1em; border: 1px solid var(--hair); vertical-align: -.15em;
  margin-right: .35em; font: 11px/1em var(--sans); text-align: center; }
li.done .box { background: var(--paper-2); }
blockquote { margin: 1.2em 0; padding: 10px 16px; border-left: 3px solid var(--red); background: var(--paper-2); }
blockquote p:last-child, blockquote ul:last-child, blockquote div:last-child { margin-bottom: 0; }
blockquote.fill { border-left-color: var(--hair); }
code { font-family: var(--mono); font-size: .88em; background: var(--paper-2); padding: 0 .25em; border-radius: 2px; }
pre { font-family: var(--mono); font-size: 13.5px; line-height: 1.45; padding: 12px 14px; overflow-x: auto;
  background: var(--paper-2); border: 1px solid var(--rule); }
pre code { background: none; padding: 0; font-size: inherit; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2em 0; }
img { max-width: 100%; height: auto; }

/* tables: sans, scroll inside a container */
.table-scroll { overflow-x: auto; margin: 1em 0 1.4em; border: 1px solid var(--rule); }
table { border-collapse: collapse; width: 100%; font-family: var(--sans); font-size: 14px; line-height: 1.4; }
th, td { text-align: left; vertical-align: top; padding: 7px 10px; border-bottom: 1px solid var(--rule); }
th { font-weight: 600; background: var(--paper-2); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

/* plates: mermaid diagrams in a hairline frame; scroll, never shrink */
.plate { margin: 1.2em 0 1.6em; border: 1px solid var(--hair); padding: 4px; background: #fbf8f1; max-width: 100%; }
.plate-scroll { overflow-x: auto; padding: 12px; }
.plate pre.mermaid { background: none; border: 0; padding: 0; margin: 0; font-family: var(--sans); color: transparent; }
.plate pre.mermaid[data-processed] { color: inherit; }
.plate svg { display: block; margin: 0 auto; }

/* figures */
figure.figure { margin: 1.4em 0; padding: 8px; border: 1px solid var(--hair); background: #fbf8f1; }
figure.figure img { display: block; margin: 0 auto 8px; }
figure.figure figcaption { font-family: var(--sans); font-size: 13.5px; color: var(--ink-2); padding: 4px 6px 2px; }

/* cover */
.box { border: 1px solid var(--hair); padding: 14px 18px; margin: 1.4em 0; background: var(--paper-2); }
.box h2 { border: 0; margin: 0 0 8px; padding: 0; font-size: 19px; }
.box p:last-child { margin-bottom: 0; }
.doors { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 1.4em 0; }
@media (min-width: 560px) { .doors { grid-template-columns: 1fr 1fr; } }
.door { display: block; padding: 16px 18px; border: 1px solid var(--ink); color: var(--ink); background: var(--paper); }
.door b { display: block; font-size: 22px; font-weight: 400; color: var(--red); }
.door span { font-family: var(--sans); font-size: 13.5px; color: var(--ink-2); }
.door:hover { text-decoration: none; background: var(--paper-2); }
.contents h2 { margin-top: 32px; }
.contents ol { list-style: none; padding: 0; }
.contents li { margin: 0 0 .5em; }
.contents li a { color: var(--ink); }
.contents li .n { display: inline-block; font-family: var(--sans); font-size: 12.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--hair); min-width: 6.5em; }
.contents li .t { font-weight: 600; }
.contents li .summary { color: var(--ink-2); font-style: italic; }
.corrections { font-family: var(--sans); font-size: 13.5px; color: var(--ink-2); border-top: 1px solid var(--rule); padding-top: 12px; margin-top: 32px; }

/* evidence gallery */
figure.evidence { margin: 1.6em 0; padding: 8px; border: 1px solid var(--hair); background: #fbf8f1; }
figure.evidence img { display: block; margin: 0 auto 8px; }
figure.evidence figcaption { font-family: var(--sans); font-size: 13.5px; color: var(--ink-2); padding: 2px 6px; }
figure.evidence .clip { font-family: var(--mono); font-size: 12.5px; }

/* model pages: full width, the model in an iframe with its own dark chrome */
article.modelpage { max-width: none; }
article.modelpage .opener, article.modelpage > p { max-width: var(--measure); }
iframe.model { display: block; width: 100%; border: 1px solid var(--hair); background: #3a3833; margin: 1em 0 .6em; }
.modelnote { font-family: var(--sans); font-size: 13px; color: var(--hair); }