:root {
  --paper: #f3f1ea;
  --ink: #1c1b17;
  --ink-soft: #4a473e;
  --line: #cfc9b8;
  --accent: #a24a2b;
  --box: #ffffff;
  --mono: "SFMono-Regular", "Consolas", "Liberation Mono", Menlo, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
}

code, q, .flow__label, .diagram__tag, .roster__name, .doc-head__path, .toc__label, .num {
  font-family: var(--mono);
}

code {
  background: rgba(28, 27, 23, 0.06);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.05em 0.35em;
  font-size: 0.85em;
}

q {
  quotes: "\201C" "\201D" "\2018" "\2019";
  font-style: italic;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(162, 74, 43, 0.4);
}

a:hover {
  text-decoration-color: var(--accent);
}

/* ---- header ---- */

.doc-head {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  border-bottom: 1px solid var(--line);
}

.doc-head__path {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.doc-head__path .sep {
  color: var(--line);
  margin: 0 2px;
}

.doc-head h1 {
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 600;
  margin: 8px 0 6px;
  letter-spacing: -0.01em;
}

.doc-head__meta {
  color: var(--ink-soft);
  font-size: 15px;
  margin: 0;
}

/* ---- table of contents ---- */

.toc {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
}

.toc__label {
  font-size: 12px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.toc ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.toc a {
  text-decoration: none;
  border-bottom: 1px dotted var(--line);
}

.toc a:hover {
  border-bottom-color: var(--accent);
}

/* ---- main content ---- */

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 8px 24px 40px;
}

.lede {
  padding-top: 28px;
}

section {
  padding-top: 40px;
  padding-bottom: 8px;
  border-top: 1px solid var(--line);
  margin-top: 0;
}

section:first-of-type {
  border-top: none;
}

h2 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.num {
  color: var(--accent);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.05em;
}

p {
  margin: 0 0 16px;
}

/* ---- two-layer diagram ---- */

.diagram {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 20px 0 28px;
  flex-wrap: wrap;
}

.diagram__box {
  flex: 1 1 160px;
  background: var(--box);
  border: 1px solid var(--ink);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 150px;
}

.diagram__box--repo {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.diagram__tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.diagram__box--repo .diagram__tag {
  color: #e0a888;
}

.diagram__title {
  font-size: 17px;
  font-weight: 600;
}

.diagram__sub {
  font-size: 13px;
  color: var(--ink-soft);
}

.diagram__box--repo .diagram__sub {
  color: #c9c5b8;
}

.diagram__arrow {
  flex: 0 0 auto;
  width: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.diagram__arrow::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--line);
}

.diagram__arrow span {
  position: relative;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-soft);
  padding: 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---- roster ---- */

.roster {
  border: 1px solid var(--line);
  margin: 4px 0 24px;
}

.roster__row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}

.roster__row:last-child {
  border-bottom: none;
}

.roster__row--muted {
  background: rgba(28, 27, 23, 0.03);
  color: var(--ink-soft);
}

.roster__name {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

.roster__row--muted .roster__name {
  color: var(--ink-soft);
}

.roster__desc {
  font-size: 15px;
}

/* ---- flow ---- */

.flow {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  margin: 4px 0 20px;
  background: var(--box);
}

.flow__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
  display: block;
}

.flow__steps {
  margin: 0;
  padding-left: 20px;
  font-size: 15px;
  color: var(--ink);
}

.flow__steps li {
  margin: 3px 0;
}

/* ---- hard rules ---- */

.rules {
  margin: 0 0 16px;
  padding-left: 0;
  list-style: none;
}

.rules li {
  position: relative;
  padding: 9px 0 9px 22px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}

.rules li:last-child {
  border-bottom: none;
}

.rules li::before {
  content: "\2014";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ---- footer ---- */

.doc-foot {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 24px 56px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
}

.doc-foot p {
  margin: 0;
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }
  .doc-head h1 {
    font-size: 30px;
  }
  .diagram {
    flex-direction: column;
  }
  .diagram__arrow {
    width: auto;
    height: 32px;
  }
  .diagram__arrow::before {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    width: 1px;
    height: auto;
  }
  .roster__row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}