/* Title page and reading-order index. */

.hero {
  min-height: auto;
  display: block;
  padding: 58px 0 62px;
  border-bottom: 1px solid var(--line);
}
.hero-copy {
  position: relative;
  max-width: var(--reading-measure);
}
.hero h1 .outline { color: var(--pink-signature); }
.hero-byline {
  margin: -8px 0 9px;
  color: var(--blue-structural);
  font: 700 var(--font-size-metadata)/1.4 var(--mono-font);
  letter-spacing: .045em;
}
.hero-provenance {
  display: grid;
  grid-template-columns: 1.45fr 1fr .8fr;
  margin: 0 0 20px;
  padding: 9px 0 10px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--sans-font);
}
.hero-provenance > div {
  min-width: 0;
  padding: 0 14px;
}
.hero-provenance > div:first-child { padding-left: 0; }
.hero-provenance > div + div { border-left: 1px solid var(--line); }
.hero-provenance dt {
  margin: 0 0 3px;
  color: var(--faint);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .045em;
  text-transform: uppercase;
}
.hero-provenance dd {
  margin: 0;
  color: var(--ink);
  font: var(--font-size-technical)/1.4 var(--serif-font);
}
.hero-provenance a {
  color: var(--blue-structural);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.hero-provenance code {
  font: 700 var(--font-size-metadata)/1.4 var(--mono-font);
}
.hero-deck {
  max-width: var(--reading-measure);
  margin: 0;
  color: var(--muted);
  font-size: var(--font-size-body);
  line-height: 1.72;
}
.hero-introduction {
  max-width: var(--reading-measure);
  margin-top: 18px;
  color: var(--muted);
  font-size: var(--font-size-body);
  line-height: 1.72;
}
.hero-introduction > :first-child { margin-top: 0; }
.hero-introduction > :last-child { margin-bottom: 0; }
.hero-feedback {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-top: 20px;
  padding-top: 13px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: var(--font-size-supporting)/1.45 var(--serif-font);
  font-style: normal;
}
.hero-feedback span { text-wrap: pretty; }
.hero-feedback a {
  flex: 0 0 auto;
  color: var(--blue-structural);
  font: 700 var(--font-size-technical)/1.4 var(--sans-font);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.hero-feedback a:hover { color: var(--pink-text); }
.hero-reading { margin-top: 30px; }
.hero-index-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 9px;
  padding: 0 1px;
}
.hero-index-head strong {
  color: var(--ink);
  font: 700 var(--font-size-metadata)/1.4 var(--sans-font);
  letter-spacing: .045em;
  text-transform: uppercase;
}
.hero-index-head span {
  color: var(--faint);
  font: var(--font-size-metadata)/1.4 var(--mono-font);
}
.hero-index {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}
.hero-index a {
  min-height: 94px;
  padding: 14px 16px;
  text-decoration: none;
  transition: none;
}
.hero-index a + a { border-left: 1px solid var(--line); }
.hero-index a:nth-child(4n + 1) { border-left: 0; }
.hero-index a:nth-child(n + 5) { border-top: 1px solid var(--line); }
.hero-index a:hover { background: var(--panel-2); }
.hero-index b {
  display: block;
  margin-bottom: 8px;
  color: var(--pink-text);
  font: 700 var(--font-size-metadata) var(--mono-font);
}
.hero-index span {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
  font-family: var(--sans-font);
  font-size: var(--font-size-supporting);
  font-weight: 700;
}
.hero-index code {
  color: var(--faint);
  font: var(--font-size-metadata) var(--mono-font);
}

/* Filesystem notation: persistent key, inline lens, and local definition. */
.notation-key {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--sans-font);
}
.notation-key-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 0 8px 9px;
}
.notation-key-header > span {
  color: var(--faint);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.notation-key-clear {
  appearance: none;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--pink-text);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  cursor: pointer;
}
.notation-key-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.notation-key-item {
  appearance: none;
  width: 100%;
  display: grid;
  grid-template-columns: 23px minmax(0, 1fr);
  gap: 5px;
  align-items: baseline;
  padding: 7px 8px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}
.notation-key-item:hover,
.notation-key-item:focus-visible,
.notation-key-item.notation-highlight {
  background: color-mix(in srgb, var(--pink-signature) 6%, transparent);
  color: var(--ink);
}
.notation-key-item.notation-selected {
  box-shadow: inset 2px 0 var(--pink-signature);
}
.notation-key-item code {
  color: var(--blue-structural);
  font: 800 var(--font-size-technical)/1.2 var(--mono-font);
}
.notation-key-item.notation-highlight code { color: var(--pink-text); }
.notation-key-item span {
  overflow-wrap: anywhere;
  font: var(--font-size-metadata)/1.3 var(--sans-font);
}
.notation-key-detail {
  margin-top: 10px;
  padding: 10px 8px 11px;
  border-left: 2px solid var(--pink-signature);
  background: color-mix(in srgb, var(--pink-signature) 5%, transparent);
}
.notation-key-detail > div {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 5px;
  align-items: baseline;
}
.notation-key-detail code {
  color: var(--pink-text);
  font: 800 var(--font-size-technical)/1.2 var(--mono-font);
}
.notation-key-detail strong {
  font: 700 var(--font-size-technical)/1.25 var(--sans-font);
}
.notation-key-detail > span {
  display: block;
  margin: 7px 0 4px;
  color: var(--green-state);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .045em;
  text-transform: uppercase;
}
.notation-key-detail p {
  margin: 0;
  color: var(--muted);
  font: var(--font-size-metadata)/1.45 var(--serif-font);
}
.notation-key-rail {
  margin: 0;
  padding: 0;
  border-top: 0;
}
.notation-key-rail .notation-key-header { margin-bottom: 12px; }
.notation-key-rail .notation-key-item {
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  padding: 9px 10px;
}
.notation-key-rail .notation-key-item code {
  font-size: var(--font-size-body);
}
.notation-key-rail .notation-key-item span {
  font-size: var(--font-size-technical);
  line-height: 1.35;
}
.notation-key-rail .notation-key-detail {
  padding: 13px 12px 14px;
}
.notation-key-rail .notation-key-detail p {
  font-size: var(--font-size-technical);
  line-height: 1.5;
}
.notation-token {
  display: inline;
  margin: 0 .035em;
  padding: .02em .18em .03em;
  border: 1px solid color-mix(in srgb, var(--blue-structural) 38%, transparent);
  border-radius: 2px;
  background: color-mix(in srgb, var(--blue-structural) 4%, transparent);
  color: var(--blue-structural);
  font: 750 .94em/1.15 var(--mono-font);
  text-decoration: none;
  vertical-align: .02em;
  cursor: help;
}
.notation-token:hover,
.notation-token:focus-visible,
.notation-token.notation-highlight {
  border-color: var(--pink-text);
  background: color-mix(in srgb, var(--pink-signature) 8%, var(--panel));
  color: var(--pink-text);
}
.notation-token.notation-selected {
  box-shadow: inset 0 -2px var(--pink-signature);
}
.notation-popover {
  position: fixed;
  z-index: 90;
  width: min(340px, calc(100vw - 24px));
  padding: 14px 15px 15px;
  border: 1px solid var(--pink-text);
  background: var(--panel);
  box-shadow: 0 10px 30px rgb(41 40 36 / .14);
  pointer-events: none;
}
.notation-popover.is-pinned { pointer-events: auto; }
.notation-popover.from-notation-rail {
  width: min(300px, calc(100vw - 24px));
}
.notation-popover > header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}
.notation-popover > header > div {
  display: grid;
  grid-template-columns: 27px minmax(0, 1fr);
  gap: 7px;
  align-items: baseline;
}
.notation-popover code {
  color: var(--pink-text);
  font: 800 var(--font-size-body)/1.2 var(--mono-font);
}
.notation-popover strong {
  font: 750 var(--font-size-supporting)/1.3 var(--sans-font);
}
.notation-popover button {
  appearance: none;
  width: 25px;
  height: 25px;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--faint);
  font: 700 var(--font-size-technical)/1 var(--sans-font);
  cursor: pointer;
}
.notation-popover > span {
  display: block;
  margin: 9px 0 5px 34px;
  color: var(--green-state);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .055em;
  text-transform: uppercase;
}
.notation-popover > p {
  margin: 0 0 0 34px;
  color: var(--muted);
  font: var(--font-size-supporting)/1.48 var(--serif-font);
}
[data-notation-object] {
  transition:
    outline-color 80ms linear,
    background-color 80ms linear;
}
[data-notation-object].notation-highlight:not(svg *):not(button) {
  outline: 2px solid color-mix(in srgb, var(--pink-signature) 62%, transparent);
  outline-offset: 3px;
  background-color: color-mix(
    in srgb,
    var(--pink-signature) 4%,
    transparent
  );
}
svg [data-notation-control] { cursor: pointer; }
svg [data-notation-object].notation-highlight rect {
  stroke: var(--pink-text);
  stroke-width: 2.5px;
}
svg [data-notation-object].notation-highlight .diagram-symbol {
  fill: var(--pink-text);
}

/* Interactive components and diagrams */
.component-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  text-align: left;
}
.component-heading > .component-kicker {
  grid-row: auto;
  margin: 0;
}
.component-heading > code.component-kicker {
  color: var(--blue-structural);
  font: 700 var(--font-size-metadata)/1.4 var(--mono-font);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.component-heading > :is(h3, h4, strong) {
  margin: 0;
  font: 700 var(--font-size-card-title)/1.25 var(--sans-font);
}
.component-heading > :is(p, small) {
  margin: 0;
  color: var(--muted);
  font: var(--font-size-supporting)/1.45 var(--serif-font);
}

.technical-block {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}
.technical-block-head { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; margin-bottom: 22px; }
.technical-block-head code { color: var(--blue-structural); font: var(--font-size-metadata) ui-monospace, monospace; }
.technical-block-head h3 { margin: 9px 0 0; font-size: var(--font-size-subsection-title); }
.technical-block-head p {
  margin: 0;
  color: var(--muted);
  font-family: var(--serif-font);
  font-size: var(--font-size-supporting);
  line-height: 1.58;
}
.source-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
  border-radius: 2px;
  box-shadow: none;
  counter-reset: source-order;
}
.source-map > li {
  display: grid;
  grid-template-columns: 28px minmax(140px, .42fr) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  counter-increment: source-order;
}
.source-map > li::before {
  content: counter(source-order, decimal-leading-zero);
  color: var(--pink-text);
  font: 700 var(--font-size-metadata)/1.45 var(--mono-font);
}
.source-map > li:nth-child(even) { border-left: 1px solid var(--line); }
.source-map b {
  color: var(--ink);
  font: 700 var(--font-size-technical)/1.45 var(--sans-font);
}
.source-map code {
  color: var(--muted);
  font: var(--font-size-metadata)/1.5 var(--mono-font);
  overflow-wrap: anywhere;
  white-space: normal;
}

.code-window {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface-deep);
  box-shadow: none;
}
.code-window > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-raised);
  color: var(--muted);
  font: var(--font-size-metadata) ui-monospace, monospace;
}
.code-window > pre {
  margin: 0;
  padding: 20px;
  color: var(--code-text);
  font: var(--font-size-technical)/1.72 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  tab-size: 2;
}
.code-window > pre.annotated-code-block { padding: 18px 0 22px; }
.code-body {
  overflow-x: auto;
  padding: 18px 0 22px;
  font: var(--font-size-technical)/1.72 var(--mono-font);
  counter-reset: line;
}
.code-line { position: relative; display: block; min-width: 820px; min-height: 30px; padding: 0 172px 0 12px; line-height: 30px; white-space: pre; transition: background 100ms linear; }
.operation-sketch-window .code-line { padding-right: 212px; }
.code-line::before { counter-increment: line; content: counter(line, decimal-leading-zero); display: inline-block; width: 34px; margin-right: 14px; color: var(--faint); user-select: none; }
.code-line.highlight { background: color-mix(in srgb, var(--pink-signature) 8%, transparent); }
.code-line.highlight::before { color: var(--pink-text); }
.code-annotation {
  appearance: none;
  position: absolute;
  top: 50%;
  right: 12px;
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--blue-structural);
  font: 700 var(--font-size-metadata)/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .025em;
  text-transform: uppercase;
  white-space: nowrap;
  transform: translateY(-50%);
  cursor: pointer;
  user-select: none;
}
.code-annotation:hover,
.code-annotation:focus-visible,
.code-annotation.active {
  border-color: var(--pink-text);
  background: var(--panel);
  color: var(--pink-text);
}
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.review-grid:has(> article:nth-child(4):last-child) {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.review-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  box-shadow: none;
}
.review-card .component-heading { margin-bottom: 12px; }
.review-card h3 { font-size: var(--font-size-card-title); }
.review-card ul { margin: 0; padding: 0; list-style: none; }
.review-card li {
  position: relative;
  padding: 6px 0 6px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--font-size-supporting);
  line-height: 1.5;
}
.review-card li::before { content: "·"; position: absolute; left: 0; color: var(--blue-structural); }

.recovery-lab {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: none;
}
.recovery-lab-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
  padding: 24px 26px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.recovery-kicker {
  display: block;
  color: var(--pink-text);
  font: 700 var(--font-size-metadata)/1.35 var(--sans-font);
  letter-spacing: .07em;
  text-transform: uppercase;
}
.recovery-lab-header h4 {
  margin: 0;
  font-size: var(--font-size-card-title);
}
.recovery-lab-header > div:first-child p {
  color: var(--muted);
  font-size: var(--font-size-supporting);
  line-height: 1.5;
}
.recovery-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  min-width: 286px;
  margin: 0;
  padding-left: 26px;
  border-left: 1px solid var(--line);
}
.recovery-facts > div {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.recovery-facts > div + div {
  margin-left: 20px;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}
.recovery-facts dt {
  order: 2;
  margin-top: 4px;
  color: var(--muted);
  font: 700 var(--font-size-metadata)/1.35 var(--sans-font);
  letter-spacing: .055em;
  text-transform: uppercase;
}
.recovery-facts dd {
  order: 1;
  margin: 0;
  color: var(--green-state);
  font: 800 var(--font-size-data)/1 var(--mono-font);
}
.recovery-trace {
  padding: 30px 24px 24px;
  background: var(--surface-deep);
}
.recovery-sequence,
.recovery-durable-bridge {
  display: grid;
  grid-template-columns:
    minmax(0, .9fr)
    minmax(0, 1.1fr)
    minmax(116px, .72fr)
    minmax(0, 1.1fr)
    minmax(0, .9fr);
  gap: 24px;
}
.recovery-sequence {
  margin: 0;
  padding: 0;
  list-style: none;
}
.recovery-sequence > li {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 158px;
  padding: 16px 15px 15px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.recovery-sequence > li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -20px;
  z-index: 2;
  color: var(--blue-structural);
  content: "→";
  font: 700 var(--font-size-body)/1 var(--mono-font);
  transform: translateY(-50%);
}
.recovery-stage-label {
  display: block;
  color: var(--blue-structural);
  font: 700 var(--font-size-metadata)/1.3 var(--mono-font);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.recovery-stage > .recovery-stage-label {
  margin-bottom: auto;
}
.recovery-sequence strong {
  display: block;
  color: var(--ink);
  font: 700 var(--font-size-technical)/1.35 var(--sans-font);
}
.recovery-sequence small {
  display: block;
  margin-top: 5px;
  color: var(--faint);
  font: var(--font-size-metadata)/1.35 var(--mono-font);
}
.recovery-stage-run {
  box-shadow: inset 0 3px var(--blue-structural);
}
.recovery-stage-saved,
.recovery-stage-validated {
  box-shadow: inset 0 3px var(--green-state);
}
.recovery-stage-saved .recovery-stage-label,
.recovery-stage-validated .recovery-stage-label,
.recovery-stage-validated small {
  color: var(--green-state);
}
.recovery-stage-committed {
  box-shadow: inset 0 3px var(--blue-structural);
}
.recovery-crash {
  align-items: center;
  justify-content: center;
  border-color: color-mix(in srgb, var(--danger) 55%, var(--line));
  background: color-mix(in srgb, var(--danger) 5%, var(--panel));
  text-align: center;
}
.recovery-crash-mark {
  margin-bottom: 8px;
  color: var(--danger);
  font: 700 var(--font-size-data)/.8 var(--mono-font);
}
.recovery-crash .recovery-stage-label,
.recovery-crash strong {
  color: var(--danger);
}
.recovery-crash strong {
  margin-top: 12px;
}
.recovery-survival {
  display: none;
  margin-top: 10px;
  color: var(--green-state);
  font: 700 var(--font-size-metadata)/1.4 var(--mono-font);
}
.recovery-durable-bridge {
  margin-top: 27px;
}
.recovery-durable-bridge span {
  position: relative;
  grid-column: 2 / 5;
  padding-top: 10px;
  border-top: 2px solid var(--green-state);
  color: var(--green-state);
  font: 700 var(--font-size-metadata)/1.35 var(--sans-font);
  letter-spacing: .045em;
  text-align: center;
  text-transform: uppercase;
}
.recovery-durable-bridge span::before,
.recovery-durable-bridge span::after {
  position: absolute;
  top: -5px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green-state);
  content: "";
}
.recovery-durable-bridge span::before { left: 0; }
.recovery-durable-bridge span::after { right: 0; }

/* Persistent orientation for the long-form study. */
.study-layout {
  display: grid;
  grid-template-columns: minmax(180px, 190px) minmax(0, var(--max));
  align-items: start;
  width: 100%;
  max-width: calc(var(--max) + 190px);
  margin-inline: auto;
}
.study-chapters {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}
.chapter-rail {
  grid-column: 1;
  grid-row: 1;
  position: sticky;
  top: 24px;
  align-self: start;
  height: calc(100vh - 48px);
  height: calc(100dvh - 48px);
  padding: 34px 16px 28px 14px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  scrollbar-width: auto;
}
.chapter-rail-kicker {
  display: block;
  margin: 0 8px 12px;
  color: var(--faint);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.chapter-navigation-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.chapter-navigation-link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  min-height: 38px;
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans-font);
  line-height: 1.2;
  text-decoration: none;
}
.chapter-navigation-link:hover {
  background: var(--panel-2);
  color: var(--ink);
}
.chapter-navigation-link[aria-current="location"] {
  background: color-mix(in srgb, var(--pink-signature) 5%, transparent);
  box-shadow: inset 2px 0 var(--pink-signature);
  color: var(--ink);
  font-weight: 700;
}
.chapter-navigation-index {
  color: var(--pink-text);
  font: 700 var(--font-size-metadata)/1.2 var(--mono-font);
}
.chapter-navigation-label {
  overflow-wrap: anywhere;
  font-size: var(--font-size-technical);
  letter-spacing: .025em;
}
.section-position {
  margin: 14px 8px 0;
  padding: 12px 0 13px;
  border-top: 1px solid var(--line);
}
.section-position > span,
.contents-navigation-kicker,
.chapter-outline-kicker {
  display: block;
  color: var(--faint);
  font: 700 var(--font-size-metadata)/1.3 var(--sans-font);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.section-position strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font: 700 var(--font-size-metadata)/1.4 var(--sans-font);
}
.section-position + .notation-key-rail { margin-top: 14px; }
.chapter-outline {
  max-width: 830px;
  margin-top: 30px;
}
.chapter-outline-kicker { margin-bottom: 9px; }
.chapter-outline-list,
.section-navigation-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.chapter-outline-list > li,
.section-navigation-list > li {
  min-width: 0;
  border-bottom: 1px solid var(--line);
}
.chapter-outline-list > li:nth-child(even),
.section-navigation-list > li:nth-child(even) {
  border-left: 1px solid var(--line);
}
.chapter-outline-link,
.section-navigation-link {
  display: grid;
  grid-template-columns: 27px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  height: 100%;
  min-height: 48px;
  padding: 11px 13px 12px;
  color: var(--muted);
  font-family: var(--sans-font);
  line-height: 1.32;
  text-decoration: none;
}
.chapter-outline-link:hover,
.section-navigation-link:hover {
  background: var(--panel-2);
  color: var(--ink);
}
.chapter-outline-link[aria-current="location"],
.section-navigation-link[aria-current="location"] {
  background: color-mix(in srgb, var(--pink-signature) 5%, transparent);
  box-shadow: inset 2px 0 var(--pink-signature);
  color: var(--ink);
}
.chapter-outline-link > span,
.section-navigation-link > span {
  color: var(--pink-text);
  font: 700 var(--font-size-metadata)/1.3 var(--mono-font);
}
.chapter-outline-link > strong,
.section-navigation-link > strong {
  font-size: var(--font-size-technical);
  font-weight: 700;
}
.chapter-outline-link code,
.section-navigation-link code {
  font-size: .92em;
}
.contents-section-group,
.contents-chapter-group {
  background: var(--panel);
}
.contents-navigation-kicker {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 14px 20px 10px;
}
.contents-section-group:not([hidden]) + .contents-chapter-group {
  border-top: 1px solid var(--line);
}
.compact-study-tools,
.chapter-menu,
.notation-menu { display: none; }