:root {
  --paper: #fffefa;
  --background: #f4f2ed;
  --ink: #252523;
  --muted: #666661;
  --soft: #817f78;
  --line: #d8d5cd;
  --line-dark: #b8b2a9;
  --accent: #872b35;
  --accent-dark: #63202a;
  --accent-soft: #f6eeee;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 22px; }
body { margin: 0; color: var(--ink); background: var(--background); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-dark); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
h1, h2, h3, h4, p, ol, ul, figure { margin-top: 0; }
h1, h2, h3, h4 { color: var(--ink); }
p { margin-bottom: 1.05em; }
::selection { background: #e5cdd0; color: #29191d; }
.site { background: var(--paper); min-height: 100vh; max-width: 1440px; margin: auto; box-shadow: 0 0 0 1px rgba(0,0,0,.035); }
.container { max-width: 1160px; margin: 0 auto; padding-left: 38px; padding-right: 38px; }
.top-rule { height: 5px; background: var(--accent); }
.utility-row { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding-top: 13px; padding-bottom: 12px; color: var(--muted); border-bottom: 1px solid var(--line); font: 10px/1.5 var(--mono); text-transform: uppercase; letter-spacing: .065em; }
.utility-row a { color: var(--muted); text-decoration: none; }
.utility-row a:hover { color: var(--accent); }
.masthead { display: flex; justify-content: space-between; gap: 30px; align-items: center; padding-top: 25px; padding-bottom: 28px; }
.logo-link { display: inline-flex; align-items: center; gap: 15px; text-decoration: none; color: var(--ink); }
.logo-link:hover { color: var(--ink); }
.logo-type { display: block; font: 700 43px/.95 var(--serif); letter-spacing: -.035em; }
.logo-sub { display: block; font: 10px/1.8 var(--mono); text-transform: uppercase; color: var(--accent); letter-spacing: .12em; margin-top: 7px; }
.masthead-description { max-width: 285px; margin: 0; font: 14px/1.55 var(--serif); color: var(--muted); text-align: right; }
.nav-shell { border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line); background: #f8f7f3; }
.primary-nav { display: flex; align-items: stretch; gap: 0; flex-wrap: wrap; }
.primary-nav a { display: inline-flex; align-items: center; padding: 11px 19px 12px; border-right: 1px solid var(--line); font: 12px/1.3 var(--sans); font-weight: 600; letter-spacing: .015em; color: #3b3b39; text-decoration: none; transition: background .15s, color .15s; }
.primary-nav a:first-child { border-left: 1px solid var(--line); }
.primary-nav a:hover { background: var(--accent-soft); color: var(--accent); }
.primary-nav a[aria-current="page"] { background: var(--accent); color: #fff; }
.breadcrumb { display: flex; gap: 9px; color: var(--soft); font: 11px/1.5 var(--mono); margin: 31px 0 0; }
.breadcrumb a { color: var(--muted); }
.page-heading { padding: 34px 0 38px; border-bottom: 1px solid var(--line-dark); }
.kicker { font: 11px/1.5 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
.page-heading h1 { font: 400 clamp(34px, 3.7vw, 50px)/1.16 var(--serif); letter-spacing: -.025em; max-width: 900px; margin: 0 0 19px; text-wrap: balance; overflow-wrap: normal; word-break: normal; hyphens: manual; }
.page-heading .lead { font: 18px/1.65 var(--serif); color: #4e4a48; max-width: 810px; margin-bottom: 18px; }
.keywords { font: 11px/1.7 var(--mono); color: var(--muted); margin: 0; }
.keywords strong { color: #44413d; font-weight: 600; }
.main-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: clamp(38px, 5.5vw, 76px); align-items: start; padding-top: 44px; padding-bottom: 82px; }
.main-column { min-width: 0; }
.side-column { border-left: 1px solid var(--line); padding-left: 22px; position: sticky; top: 28px; }
.side-block + .side-block { margin-top: 32px; }
.side-title { font: 700 11px/1.5 var(--sans); text-transform: uppercase; letter-spacing: .06em; padding-bottom: 9px; margin: 0 0 11px; color: #3a3936; border-bottom: 1px solid var(--line); }
.side-column p { color: var(--muted); font-size: 12px; line-height: 1.7; }
.side-list { padding: 0; margin: 0; list-style: none; }
.side-list li { margin: 0; padding: 5px 0; font-size: 13px; line-height: 1.4; }
.side-list a { text-decoration: none; }
.side-list a:hover { text-decoration: underline; }
.side-meta { margin: 0; }
.side-meta div { padding: 7px 0 10px; border-bottom: 1px solid #e7e4df; }
.side-meta dt { font: 10px/1.6 var(--mono); color: var(--muted); text-transform: uppercase; }
.side-meta dd { margin: 1px 0 0; font-size: 13px; line-height: 1.5; }
.content-section { padding-top: 4px; scroll-margin-top: 25px; }
.content-section + .content-section { margin-top: 54px; }
.section-head { display: flex; align-items: baseline; gap: 14px; padding-bottom: 9px; border-bottom: 1px solid var(--line-dark); margin-bottom: 21px; }
.section-index { flex: 0 0 auto; font: 11px/1 var(--mono); color: var(--accent); }
.section-head h2 { font: 400 clamp(23px, 2.5vw, 30px)/1.25 var(--serif); letter-spacing: -.015em; margin: 0; }
.section-intro { font: 17px/1.7 var(--serif); color: #484744; margin: 0 0 20px; }
.text-block p { max-width: 72ch; font-size: 15px; line-height: 1.78; color: #40403e; }
.text-block p:last-child { margin-bottom: 0; }
.research-items { list-style: none; padding: 0; margin: 0; }
.research-items li { display: grid; grid-template-columns: 31px 1fr; gap: 13px; padding: 15px 0 17px; border-bottom: 1px solid var(--line); }
.research-items li:first-child { border-top: 1px solid var(--line); }
.item-num { font: 11px/1.8 var(--mono); color: var(--accent); }
.research-items h3 { font: 400 20px/1.35 var(--serif); margin: 0 0 7px; }
.research-items p { font-size: 14px; line-height: 1.7; color: #53514d; margin: 0; }
.record-list { margin: 0; padding: 0; list-style: none; }
.record { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 18px; padding: 20px 0 21px; border-bottom: 1px solid var(--line); }
.record:first-child { border-top: 1px solid var(--line); }
.record-category { color: var(--soft); font: 11px/1.8 var(--mono); }
.record h3 { font: 400 22px/1.25 var(--serif); margin-bottom: 6px; }
.record h3 a { text-decoration: none; }
.record h3 a:hover { text-decoration: underline; }
.record p { font-size: 14px; line-height: 1.65; color: #514f4b; margin-bottom: 9px; }
.record-links { display: flex; flex-wrap: wrap; gap: 8px 16px; font: 12px/1.5 var(--sans); }
.record-links a { font-weight: 600; }
.definition-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0 24px; margin: 6px 0 0; }
.definition-list div { border-top: 1px solid var(--line); padding: 14px 0; }
.definition-list dt { font: 700 13px/1.55 var(--sans); margin: 0 0 4px; }
.definition-list dd { font-size: 13px; line-height: 1.68; color: #585650; margin: 0; }
.notice { padding: 17px 20px 16px; border-left: 3px solid var(--accent); background: #f6f4f0; font-size: 14px; line-height: 1.75; color: #514e4a; }
.notice strong { color: var(--ink); }
.notice p:last-child { margin: 0; }
.implementation-notice { margin-top: 20px; }
.note-record { padding: 18px 0 21px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.note-record .note-meta { font: 11px/1.6 var(--mono); color: var(--muted); margin-bottom: 6px; }
.note-record h3 { font: 400 22px/1.4 var(--serif); margin: 0 0 7px; }
.note-record p { font-size: 14px; color: #55534e; margin: 0; }
.link-line { font-size: 14px; margin: 18px 0 0; }
.link-line a { font-weight: 600; }
.paper-heading h1 { font-size: clamp(48px, 7vw, 78px); letter-spacing: -.045em; margin-bottom: 6px; }
.paper-subtitle { font: 400 clamp(19px,2.3vw,27px)/1.4 var(--serif); color: #5a5651; margin: 0 0 24px; }
.paper-label { display: flex; flex-wrap: wrap; gap: 9px 24px; font: 11px/1.55 var(--mono); color: var(--muted); margin-bottom: 18px; }
.paper-label span + span { position: relative; }
.paper-label span + span:before { content: "·"; position: absolute; left: -15px; color: var(--soft); }
.abstract { background: #f8f6f2; border: 1px solid var(--line); padding: 22px 26px 19px; margin: 0 0 25px; }
.abstract h2 { font: 700 12px/1.5 var(--sans); text-transform: uppercase; letter-spacing: .065em; color: var(--accent); margin: 0 0 9px; }
.abstract p { font: 16px/1.75 var(--serif); color: #44413e; margin: 0; }
.protocol-list { margin: 0; padding: 0; list-style: none; counter-reset: protocol; border-top: 1px solid var(--line); }
.protocol-list li { counter-increment: protocol; display: grid; grid-template-columns: 29px 145px 1fr; column-gap: 13px; padding: 11px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.protocol-list li::before { content: counter(protocol,decimal-leading-zero); color: var(--accent); font: 11px/1.5 var(--mono); }
.protocol-list strong { font: 600 13px/1.55 var(--sans); }
.protocol-list span { font-size: 13px; color: #585650; line-height: 1.6; }
.diagram { border: 1px solid var(--line-dark); background: #fbfaf7; padding: 22px; margin: 25px 0 16px; text-align: center; }
.diagram-label { font: 10px/1.5 var(--mono); color: var(--soft); text-transform: uppercase; letter-spacing: .06em; text-align: left; margin-bottom: 20px; }
.flow-box { width: min(100%, 415px); margin: auto; border: 1px solid #a6a49d; background: #fffefa; padding: 10px 13px; font: 700 12px/1.5 var(--sans); letter-spacing: .045em; }
.flow-box small { display: block; font: 11px/1.6 var(--mono); letter-spacing: 0; font-weight: 400; color: var(--muted); }
.flow-arrow { display: block; font: 23px/1.4 var(--serif); color: #88847e; padding: 3px; }
.runtime-shell { border: 1px solid #a6a49d; padding: 16px; text-align: left; }
.runtime-shell-title { font: 700 11px/1.4 var(--mono); letter-spacing: .05em; color: var(--accent); margin: 0 0 13px; text-transform: uppercase; }
.module-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 9px; }
.module { padding: 11px 10px; border: 1px solid var(--line); background: white; }
.module b { display: block; font: 700 12px/1.4 var(--sans); }
.module small { display: block; color: var(--muted); font: 11px/1.5 var(--sans); margin-top: 4px; }
.decision-module { border: 1px solid #ad9296; background: #f8f1f1; padding: 10px; margin-top: 10px; text-align: center; }
.decision-module b { font-size: 12px; }
.decision-module small { display: block; font-size: 11px; color: #6b5557; }
.figure-caption { text-align: left; font: 11px/1.65 var(--mono); color: var(--muted); margin: 12px 0 0; }
.table-wrap { width: 100%; overflow-x: auto; }
.spec-table { width: 100%; border-collapse: collapse; margin: 12px 0 0; font-size: 13px; }
.spec-table th { background: #f6f4f0; font: 700 11px/1.45 var(--sans); text-align: left; letter-spacing: .045em; text-transform: uppercase; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); padding: 12px; }
.spec-table td { border-bottom: 1px solid var(--line); vertical-align: top; padding: 11px 12px; line-height: 1.65; color: #4d4b48; }
.spec-table td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }
.question-list { margin: 0; padding-left: 22px; }
.question-list li { margin: 0 0 10px; padding-left: 5px; font: 15px/1.7 var(--serif); }
.reference-list { padding-left: 20px; margin: 0; font-size: 14px; line-height: 1.9; }
.reference-list li { padding-left: 3px; }
.footer { border-top: 1px solid var(--line-dark); background: #f8f7f3; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 22px; padding-top: 25px; padding-bottom: 29px; }
.footer-name { font: 700 20px/1.3 var(--serif); margin: 0 0 3px; }
.footer-description { font-size: 12px; color: var(--muted); margin: 0; }
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; }
.footer-bottom { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 13px; padding-bottom: 15px; font: 10px/1.6 var(--mono); color: var(--soft); }
.footer-bottom a { color: var(--muted); }
@media (max-width: 850px) {
  .container { padding-left: 26px; padding-right: 26px; }
  .primary-nav { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: thin; }
  .primary-nav a { flex: 0 0 auto; padding-left: 14px; padding-right: 14px; }
  .main-layout { grid-template-columns: 1fr; gap: 48px; padding-top: 36px; padding-bottom: 65px; }
  .side-column { position: static; border-left: 0; border-top: 1px solid var(--line-dark); padding: 20px 0 0; display: grid; grid-template-columns: repeat(2,1fr); gap: 20px; }
  .side-block + .side-block { margin-top: 0; }
}
@media (max-width: 560px) {
  body { font-size: 15px; }
  .container { padding-left: 19px; padding-right: 19px; }
  .utility-row { font-size: 9px; }
  .utility-row span:last-child { display: none; }
  .masthead { padding-top: 19px; padding-bottom: 18px; }
  .logo-type { font-size: 36px; }
  .masthead-description { display: none; }
  .primary-nav { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: thin; }
  .primary-nav a { flex: 0 0 auto; padding: 11px 13px; font-size: 12px; }
  .breadcrumb { margin-top: 23px; flex-wrap: wrap; }
  .page-heading { padding: 25px 0 28px; }
  .page-heading h1 { font-size: 35px; }
  .page-heading .lead { font-size: 17px; }
  .paper-heading h1 { font-size: 55px; }
  .paper-subtitle { font-size: 20px; }
  .paper-label { gap: 5px 12px; }
  .paper-label span + span:before { display: none; }
  .section-head h2 { font-size: 24px; }
  .record { grid-template-columns: 1fr; gap: 3px; }
  .record-category { font-size: 10px; }
  .definition-list { grid-template-columns: 1fr; }
  .side-column { grid-template-columns: 1fr; }
  .protocol-list li { grid-template-columns: 27px 1fr; gap: 6px 10px; }
  .protocol-list span { grid-column: 2; }
  .module-grid { grid-template-columns: repeat(2,1fr); }
  .diagram { padding: 13px; }
  .abstract { padding: 18px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-bottom { flex-direction: column; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .primary-nav a { transition: none; }
}

.org-hierarchy { border: 1px solid var(--line-dark); margin: 25px 0 23px; background: #fbfaf7; padding: 18px 20px; }
.org-parent { display: grid; gap: 2px; padding: 0 0 15px; border-bottom: 1px solid var(--line); }
.org-tag { font: 10px/1.6 var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .035em; }
.org-parent strong { font: 400 24px/1.2 var(--serif); }
.org-parent small, .org-child small { display: block; font: 12px/1.6 var(--sans); color: var(--muted); }
.org-children { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 15px; padding: 16px 0 0 14px; border-left: 1px solid var(--line-dark); margin-left: 8px; }
.org-child { position: relative; min-width: 0; }
.org-child::before { content: ""; position: absolute; left: -15px; top: 12px; width: 12px; border-top: 1px solid var(--line-dark); }
.org-child strong { display: block; font: 400 17px/1.35 var(--serif); margin: 4px 0; }
.org-child strong a { text-decoration: none; }
.org-child strong a:hover { text-decoration: underline; }
@media (max-width: 650px) { .org-children { grid-template-columns: 1fr; gap: 20px; } }