:root {
  --handbook-bg: #05080b;
  --handbook-panel: #0b1117;
  --handbook-panel-strong: #101820;
  --handbook-line: rgba(226, 232, 240, 0.17);
  --handbook-ink: #f8fafc;
  --handbook-body: #d7dee7;
  --handbook-muted: #9aa6b2;
  --handbook-lime: #a3e635;
  --handbook-teal: #2dd4bf;
}

body {
  background:
    radial-gradient(circle at 8% 10%, rgba(163, 230, 53, 0.055), transparent 32rem),
    radial-gradient(circle at 92% 22%, rgba(45, 212, 191, 0.055), transparent 34rem),
    var(--handbook-bg);
}

html:has(.handbook-chapter-page),
body:has(.handbook-chapter-page) {
  overflow-x: clip;
}

.handbook-page,
.handbook-page * {
  -webkit-user-select: text;
  user-select: text;
}

.handbook-page {
  color: var(--handbook-ink);
  overflow-x: clip;
}

.handbook-page a:focus-visible,
.handbook-page summary:focus-visible,
.handbook-page [tabindex="0"]:focus-visible {
  outline: 3px solid var(--handbook-lime);
  outline-offset: 4px;
}

.handbook-hero,
.chapter-hero {
  border-bottom: 1px solid var(--handbook-line);
  background:
    linear-gradient(110deg, rgba(163, 230, 53, 0.06), transparent 48%),
    repeating-linear-gradient(90deg, transparent 0, transparent calc(25% - 1px), rgba(226, 232, 240, 0.035) 25%);
}

.handbook-hero {
  padding: clamp(4rem, 9vw, 8rem) clamp(1rem, 6vw, 6rem) clamp(3.5rem, 7vw, 6.5rem);
}

.handbook-hero h1,
.chapter-hero h1 {
  color: #fff;
  font-weight: 950;
  letter-spacing: -0.06em;
  text-wrap: balance;
}

.handbook-hero h1 {
  max-width: 1040px;
  margin: 0 0 1.75rem;
  font-size: clamp(3.7rem, 8vw, 8.5rem);
  line-height: 0.92;
}

.handbook-hero h1 span,
.chapter-hero h1 > .chapter-number,
.chapter-hero h1 .chapter-title-accent,
.chapter-section h2 {
  background: linear-gradient(92deg, #a3e635 0%, #58dd7a 54%, #2dd4bf 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
}

.handbook-hero h1 span,
.chapter-hero h1 .chapter-title-accent {
  margin: -0.08em -0.035em -0.12em;
  padding: 0.08em 0.035em 0.12em;
}

.handbook-standfirst,
.handbook-intro {
  max-width: 850px;
}

.handbook-update {
  width: fit-content;
  margin: 0 0 2rem;
  padding: 0.55rem 0.75rem;
  border-left: 0.2rem solid var(--handbook-lime);
  background: rgba(163, 230, 53, 0.07);
  color: var(--handbook-body);
  font-size: 0.9rem;
}

.handbook-update strong {
  color: #fff;
}

.handbook-standfirst {
  margin: 0;
  color: #fff;
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  font-weight: 760;
  line-height: 1.48;
}

.handbook-intro {
  margin: 1rem 0 2rem;
  color: var(--handbook-body);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.7;
}

.chapter-directory {
  width: min(1320px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 6rem) 0 7rem;
}

.directory-heading {
  max-width: 790px;
  margin-bottom: 3rem;
}

.directory-heading h2 {
  margin: 0 0 0.9rem;
  color: #fff;
  font-size: clamp(2.35rem, 5vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.directory-heading > p:last-child {
  color: var(--handbook-muted);
  font-size: 1.08rem;
}

.chapter-group + .chapter-group {
  margin-top: 3.5rem;
}

.chapter-group > h2 {
  margin: 0 0 1rem;
  color: var(--handbook-teal);
  font-size: 0.82rem;
  font-weight: 950;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--handbook-line);
  list-style: none;
}

.chapter-card-grid li {
  display: flex;
  min-width: 0;
}

.chapter-card-grid a {
  display: grid;
  grid-template-rows: auto minmax(4.7rem, auto) auto;
  width: 100%;
  min-height: 12rem;
  padding: 1.35rem;
  background: var(--handbook-panel);
  color: var(--handbook-ink);
  text-decoration: none;
}

.chapter-card-grid a:hover {
  background: var(--handbook-panel-strong);
}

.chapter-card-grid a > span,
.chapter-card-grid small {
  color: var(--handbook-lime);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chapter-card-grid strong {
  align-self: center;
  color: #fff;
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.chapter-card-grid small {
  color: var(--handbook-muted);
  text-transform: none;
}

.chapter-hero {
  padding: clamp(3rem, 7vw, 6.5rem) clamp(1rem, 6vw, 6rem) clamp(2.8rem, 5vw, 5rem);
}

.chapter-hero h1 {
  max-width: 1100px;
  margin: 0;
  font-size: clamp(3rem, 7vw, 7rem);
  line-height: 0.94;
}

.chapter-hero h1 > .chapter-number {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 0.24em;
  line-height: 1;
  letter-spacing: 0.09em;
}

.chapter-layout {
  display: grid;
  grid-template-columns: minmax(15rem, 20rem) minmax(0, 58rem);
  gap: clamp(2rem, 5vw, 5rem);
  justify-content: center;
  width: min(1380px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 5rem) 0;
}

.chapter-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  align-self: start;
  max-height: calc(100vh - var(--header-height) - 2rem);
  overflow: auto;
  border: 1px solid var(--handbook-line);
  background: rgba(11, 17, 23, 0.94);
}

.chapter-sidebar details + details {
  border-top: 1px solid var(--handbook-line);
}

.chapter-sidebar summary {
  cursor: pointer;
  padding: 1rem;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 950;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.chapter-nav-list,
.section-nav-list,
.section-subnav {
  margin: 0;
  padding: 0 0.8rem 0.9rem;
  list-style: none;
}

.chapter-nav-list a,
.section-nav-list a {
  display: grid;
  color: var(--handbook-muted);
  font-size: 0.78rem;
  font-weight: 720;
  line-height: 1.32;
  text-decoration: none;
}

.chapter-nav-list a {
  grid-template-columns: 2rem 1fr;
  gap: 0.35rem;
  padding: 0.52rem 0;
  border-top: 1px solid rgba(226, 232, 240, 0.09);
}

.chapter-nav-list a span {
  color: var(--handbook-lime);
  font-variant-numeric: tabular-nums;
}

.chapter-nav-list a[aria-current="page"] {
  color: #fff;
}

.section-nav-list > li {
  border-top: 1px solid rgba(226, 232, 240, 0.09);
}

.section-nav-list > li > a {
  padding: 0.58rem 0;
  color: #d7dee7;
}

.section-subnav {
  padding: 0 0 0.45rem 0.8rem;
  border-left: 1px solid rgba(45, 212, 191, 0.32);
}

.section-subnav a {
  padding: 0.25rem 0;
  font-size: 0.72rem;
}

.chapter-nav-list a:hover,
.section-nav-list a:hover {
  color: var(--handbook-lime);
}

.handbook-chapter-content {
  min-width: 0;
  color: var(--handbook-body);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.04rem;
  line-height: 1.72;
}

.handbook-formula {
  border-color: var(--handbook-line);
  background: var(--handbook-panel-strong);
  color: #fff;
  font-size: clamp(1rem, 2vw, 1.3rem);
}

.chapter-section {
  margin-bottom: 1.25rem;
  padding: clamp(1.25rem, 3.5vw, 2.7rem);
  border: 1px solid var(--handbook-line);
  background:
    linear-gradient(112deg, rgba(45, 212, 191, 0.025), transparent 52%),
    var(--handbook-panel);
}

.chapter-section--lead {
  border-left: 0.45rem solid var(--handbook-lime);
}

.chapter-section h2,
.chapter-section h3 {
  scroll-margin-top: 1.5rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.chapter-section h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.65rem, 3.2vw, 2.75rem);
  line-height: 1.06;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.chapter-section h3 {
  margin: 2rem 0 0.7rem;
  color: #fff;
  font-size: clamp(1.12rem, 2vw, 1.45rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.chapter-section p {
  margin: 0.85rem 0;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.chapter-section a {
  color: #78eadb;
  overflow-wrap: anywhere;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
}

.chapter-section strong,
.chapter-section b {
  color: #fff;
}

.chapter-section .source-list,
.chapter-opening ul,
.chapter-section > ul,
.chapter-section > ol {
  margin: 1rem 0;
  padding-left: 1.4rem;
}

.chapter-opening > p {
  color: #fff;
  font-size: 1.12rem;
}

.chapter-opening h3 {
  color: var(--handbook-teal);
}

.current-practice-note {
  margin: 1.8rem 0;
  padding: clamp(1rem, 3vw, 1.4rem);
  border: 1px solid rgba(45, 212, 191, 0.45);
  border-left: 0.35rem solid var(--handbook-teal);
  background: rgba(45, 212, 191, 0.065);
  color: var(--handbook-body);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

.current-practice-note > strong:first-child {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--handbook-lime);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.current-practice-note p {
  margin: 0;
}

.current-reading-intro {
  color: #fff;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-weight: 750;
}

.contemporary-reading {
  padding: 1rem 1rem 1rem 2.3rem !important;
  border: 1px solid rgba(163, 230, 53, 0.25);
  background: rgba(163, 230, 53, 0.035);
}

.process-diagram {
  margin: 2rem 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid rgba(163, 230, 53, 0.42);
  background: #080d11;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

.process-diagram figcaption {
  margin-bottom: 1.2rem;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 780;
  line-height: 1.45;
}

.process-diagram ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: process-step;
}

.process-diagram li {
  position: relative;
  min-width: 0;
  padding: 2.6rem 0.75rem 0.85rem;
  border: 1px solid var(--handbook-line);
  background: var(--handbook-panel-strong);
  counter-increment: process-step;
}

.process-diagram li::before {
  position: absolute;
  top: 0.65rem;
  left: 0.75rem;
  color: var(--handbook-lime);
  content: counter(process-step, decimal-leading-zero);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.08em;
}

.process-diagram li::after {
  position: absolute;
  top: 50%;
  right: -0.55rem;
  z-index: 1;
  color: var(--handbook-lime);
  content: "→";
  font-weight: 950;
  transform: translateY(-50%);
}

.process-diagram li:last-child::after {
  content: none;
}

.process-diagram strong,
.process-diagram span {
  display: block;
}

.process-diagram strong {
  margin-bottom: 0.35rem;
  color: #fff;
  font-size: 0.85rem;
}

.process-diagram span {
  color: var(--handbook-muted);
  font-size: 0.74rem;
  line-height: 1.45;
}

.chapter-section li {
  padding-left: 0.28rem;
  overflow-wrap: anywhere;
}

.chapter-section li + li {
  margin-top: 0.65rem;
}

.chapter-section .process-diagram li + li {
  margin-top: 0;
}

.chapter-section li::marker {
  color: var(--handbook-lime);
  font-weight: 900;
}

.chapter-section img {
  max-width: 100%;
  height: auto;
}

.handbook-figure {
  margin: 2rem 0;
  padding: 0.8rem;
  border: 1px solid rgba(163, 230, 53, 0.4);
  background: #fff;
}

.handbook-figure img {
  display: block;
  width: 100%;
}

.handbook-figure figcaption {
  padding: 0.8rem 0.2rem 0.15rem;
  color: #303d42;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.84rem;
  font-weight: 780;
}

.handbook-figure--html {
  background: #080d11;
  color: var(--handbook-body);
}

.handbook-figure--html figcaption {
  color: #fff;
}

.identifier-example {
  margin: 1.6rem 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid rgba(163, 230, 53, 0.42);
  background: #080d11;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

.identifier-example figcaption {
  margin-bottom: 1rem;
  color: #fff;
  font-weight: 780;
}

.identifier-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.identifier-fields > div {
  min-width: 0;
}

.identifier-fields strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--handbook-teal);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.digit-boxes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.digit-boxes i {
  display: grid;
  width: 2rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid #8e9ba3;
  background: #fff;
  color: #111;
  font-style: normal;
  font-weight: 850;
}

.table-scroll {
  width: 100%;
  margin: 1.6rem 0;
  overflow-x: auto;
  border: 1px solid var(--handbook-line);
}

.table-scroll table {
  width: 100%;
  min-width: 42rem;
  border-collapse: collapse;
  color: #e7edf2;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.84rem;
  line-height: 1.42;
}

.table-scroll th,
.table-scroll td {
  min-width: 8rem;
  padding: 0.72rem;
  border: 1px solid var(--handbook-line);
  vertical-align: top;
  text-align: left;
}

.table-scroll th {
  background: rgba(163, 230, 53, 0.075);
  color: #fff;
  font-weight: 820;
}

.table-scroll p {
  margin: 0.2rem 0;
}

.chapter-pagination {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  width: min(930px, calc(100% - 2rem));
  margin: 0 auto clamp(4rem, 8vw, 8rem);
  padding: 1px;
  background: var(--handbook-line);
}

.chapter-pagination a {
  display: grid;
  min-height: 7.5rem;
  align-content: center;
  padding: 1.2rem;
  background: var(--handbook-panel);
  color: #fff;
  text-decoration: none;
}

.chapter-pagination a:hover {
  background: var(--handbook-panel-strong);
}

.chapter-pagination span,
.chapter-pagination strong {
  display: block;
}

.chapter-pagination span {
  margin-bottom: 0.35rem;
  color: var(--handbook-lime);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.chapter-pagination strong {
  font-size: 1.12rem;
  line-height: 1.2;
}

@media (max-width: 960px) {
  .chapter-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-diagram ol {
    grid-template-columns: 1fr;
  }

  .process-diagram li::after {
    top: auto;
    right: 50%;
    bottom: -0.78rem;
    transform: translateX(50%) rotate(90deg);
  }

  .chapter-layout {
    display: block;
  }

  .chapter-sidebar {
    position: static;
    max-height: none;
    margin-bottom: 1rem;
  }
}

@media (max-width: 600px) {
  .handbook-hero h1 {
    font-size: clamp(3.15rem, 17vw, 5.3rem);
  }

  .chapter-hero h1 {
    font-size: clamp(2.7rem, 13vw, 4.5rem);
  }

  .chapter-card-grid,
  .chapter-pagination {
    grid-template-columns: 1fr;
  }

  .chapter-card-grid a {
    min-height: 10.5rem;
  }

  .chapter-section {
    padding: 1.15rem;
  }

  .handbook-chapter-content {
    font-size: 0.98rem;
  }

  .table-scroll table {
    min-width: 36rem;
  }

  .identifier-fields {
    grid-template-columns: 1fr;
  }
}

@media print {
  .site-header,
  .story-trail,
  .chapter-sidebar,
  .chapter-pagination,
  .site-footer {
    display: none;
  }

  body,
  .chapter-section {
    background: #fff;
    color: #111;
  }

  .handbook-hero h1 span,
  .chapter-hero h1 > .chapter-number,
  .chapter-hero h1 .chapter-title-accent,
  .chapter-section h2 {
    background: none;
    color: #111;
    -webkit-text-fill-color: #111;
  }

  .chapter-layout {
    display: block;
  }
}