:root {
  --bg:#080b0d;
  --bg-raised:#0d1114;
  --panel:#10161a;
  --panel-soft:#0b1013;
  --text:#edf3f5;
  --muted:#a7b3b9;
  --faint:#7b898f;
  --line:#233037;
  --line-strong:#34464f;
  --accent:#a9d6df;
  --accent-strong:#d2eef3;
  --max:1180px;
  --shadow:0 24px 80px rgba(0,0,0,.24);
}

*{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  background:var(--bg);
}

body{
  margin:0;
  min-width:0;
  color:var(--text);
  background:
    radial-gradient(circle at 82% 9%,rgba(120,182,194,.08),transparent 28rem),
    linear-gradient(180deg,#090d0f 0%,#080b0d 52%,#070a0c 100%);
  font-family:
    Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,
    "Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.65;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}

a{
  color:inherit;
  text-decoration:none;
}

a:focus-visible{
  outline:2px solid var(--accent-strong);
  outline-offset:4px;
  border-radius:4px;
}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:100;
  min-height:44px;
  padding:10px 16px;
  display:inline-flex;
  align-items:center;
  color:var(--bg);
  background:var(--accent-strong);
  font-size:14px;
  font-weight:700;
  transform:translateY(calc(-100% - 24px));
}

.skip-link:focus{
  transform:translateY(0);
}

main:focus{outline:none}

.shell{
  width:min(calc(100% - 40px),var(--max));
  margin-inline:auto;
}

.site-header{
  position:sticky;
  top:0;
  z-index:20;
  border-bottom:1px solid rgba(52,70,79,.52);
  background:rgba(8,11,13,.88);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
}

.header-inner{
  min-height:78px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:13px;
  min-width:max-content;
}

.brand-mark{
  width:34px;
  height:34px;
  border:1px solid var(--line-strong);
  display:grid;
  place-items:center;
  color:var(--accent-strong);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  background:linear-gradient(145deg,rgba(169,214,223,.08),transparent);
}

.brand-copy{
  display:grid;
  line-height:1.1;
}

.brand-title{
  font-size:13px;
  font-weight:700;
  letter-spacing:.13em;
  text-transform:uppercase;
}

.brand-parent{
  margin-top:5px;
  color:var(--faint);
  font-size:10px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.primary-nav{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:8px 20px;
  color:var(--muted);
  font-size:13px;
}

.primary-nav a,
.footer-links a{
  min-height:24px;
  display:inline-flex;
  align-items:center;
}

.primary-nav a{transition:color .18s ease}

.primary-nav a:hover,
.primary-nav a[aria-current="page"]{
  color:var(--text);
}

.primary-nav a[aria-current="page"]{
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:.38em;
}

.hero{
  padding:clamp(82px,10vw,132px) 0 82px;
  border-bottom:1px solid var(--line);
}

.eyebrow{
  margin:0 0 22px;
  color:var(--accent);
  font-size:11px;
  font-weight:700;
  letter-spacing:.19em;
  text-transform:uppercase;
}

h1,h2,h3,p{margin-top:0}

h1,h2,h3,
.hero-lead,
.section-copy,
.footer-copy{
  overflow-wrap:anywhere;
}

h1{
  max-width:920px;
  margin-bottom:30px;
  font-size:clamp(44px,5.5vw,82px);
  line-height:.98;
  letter-spacing:-.045em;
  font-weight:650;
}

.hero-lead{
  max-width:810px;
  margin-bottom:0;
  color:#c6d1d5;
  font-size:clamp(19px,1.7vw,26px);
  line-height:1.45;
  letter-spacing:-.012em;
}

.hero-rule{
  width:100%;
  max-width:790px;
  height:1px;
  margin:46px 0 28px;
  background:linear-gradient(90deg,var(--accent),var(--line) 54%,transparent);
}

.hero-note{
  max-width:760px;
  margin:0;
  color:var(--muted);
  font-size:15px;
}

.section{
  padding:88px 0;
  border-bottom:1px solid var(--line);
}

.section-grid{
  display:grid;
  grid-template-columns:minmax(220px,.76fr) minmax(0,1.6fr);
  gap:clamp(42px,8vw,120px);
  align-items:start;
}

.section-kicker{
  position:sticky;
  top:116px;
}

.section-number{
  display:block;
  margin-bottom:12px;
  color:var(--faint);
  font-size:10px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
}

h2{
  margin-bottom:22px;
  font-size:clamp(30px,4vw,52px);
  line-height:1.08;
  letter-spacing:-.035em;
  font-weight:620;
}

h3{
  margin-bottom:11px;
  font-size:18px;
  line-height:1.28;
  letter-spacing:-.016em;
  font-weight:620;
}

.section-copy{
  min-width:0;
  color:var(--muted);
  font-size:18px;
}

.section-copy>p{
  max-width:820px;
  margin-bottom:24px;
}

.section-copy p a,
.hero-lead a,
.hero-note a,
.institutional-note a,
.footer-copy a{
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:.2em;
}

.definition{
  margin:36px 0 0;
  padding:28px 30px;
  border:1px solid var(--line-strong);
  border-left:3px solid var(--accent);
  background:linear-gradient(135deg,rgba(169,214,223,.055),rgba(255,255,255,.015));
  box-shadow:var(--shadow);
}

.definition p{
  margin:0;
  color:var(--text);
  font-size:clamp(19px,2.2vw,25px);
  line-height:1.5;
  letter-spacing:-.013em;
}

.page-index .hero-lead{max-width:800px}
.page-index .hero-note{max-width:750px}
.page-index .section-copy>p{max-width:800px}
.page-lifecycle h1{max-width:940px}
.page-lifecycle .hero-lead{max-width:820px}
.page-lifecycle .section-copy>p{max-width:830px}

/* Overview */
.contrast{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:18px;
  margin:42px 0 0;
  align-items:stretch;
}

.contrast-card{
  padding:26px 28px;
  border:1px solid var(--line);
  background:var(--panel-soft);
}

.contrast-card small{
  display:block;
  margin-bottom:10px;
  color:var(--faint);
  font-size:10px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.contrast-card strong{
  display:block;
  color:var(--text);
  font-size:19px;
  font-weight:610;
}

.contrast-divider{
  align-self:center;
  color:var(--faint);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
}

.principles{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
  margin-top:36px;
}

.principle{
  min-height:205px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
  transition:transform .18s ease,border-color .18s ease,background .18s ease;
}

a.principle:hover{
  transform:translateY(-2px);
  border-color:var(--line-strong);
  background:linear-gradient(155deg,#12191d,#0b1013);
}

.principle-index{
  display:inline-block;
  margin-bottom:34px;
  color:var(--accent);
  font-size:10px;
  font-weight:700;
  letter-spacing:.14em;
}

.principle h3{
  text-decoration:underline;
  text-decoration-color:var(--accent);
  text-decoration-thickness:1px;
  text-underline-offset:.2em;
}

.principle p{
  margin:0;
  color:var(--muted);
  font-size:15px;
}

.sequence{
  margin-top:38px;
  border-top:1px solid var(--line-strong);
}

.sequence-row{
  display:grid;
  grid-template-columns:70px minmax(180px,.72fr) minmax(0,1.45fr);
  gap:22px;
  padding:24px 0;
  border-bottom:1px solid var(--line);
}

.sequence-index,
.evidence-index,
.dimension-index,
.creation-index,
.change-index{
  color:var(--faint);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
}

.sequence-title,
.evidence-title,
.dimension-title,
.creation-title,
.change-title,
.map-title{
  color:var(--text);
  font-weight:620;
}

.sequence-copy,
.evidence-copy,
.dimension-copy,
.creation-copy,
.change-copy,
.map-copy{
  color:var(--muted);
  font-size:15px;
}

/* Authority */
.authority-types{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
  margin-top:38px;
}

.authority-card{
  min-height:255px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

.authority-card small,
.action-card small,
.mode-card small,
.object-card small,
.provenance-card small,
.phase-card small,
.time-card small{
  display:block;
  color:var(--accent);
  font-size:10px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.authority-card small{margin-bottom:34px}

.authority-card p,
.action-card p,
.mode-card p,
.object-card p,
.provenance-card p,
.phase-card p,
.time-card p{
  margin-bottom:0;
  color:var(--muted);
  font-size:15px;
}

.authority-card .caution{
  margin-top:16px;
  padding-top:16px;
  border-top:1px solid var(--line);
  color:var(--faint);
  font-size:13px;
}

.dimensions{
  margin-top:38px;
  border-top:1px solid var(--line-strong);
}

.dimension-row{
  display:grid;
  grid-template-columns:62px minmax(150px,.65fr) minmax(0,1.55fr);
  gap:22px;
  padding:23px 0;
  border-bottom:1px solid var(--line);
}

.chain{
  margin-top:40px;
  padding:30px;
  border:1px solid var(--line);
  background:var(--panel-soft);
}

.chain-step{
  display:grid;
  grid-template-columns:38px minmax(0,1fr);
  gap:18px;
  align-items:start;
}

.chain-step+.chain-step{margin-top:19px}

.chain-node{
  width:30px;
  height:30px;
  display:grid;
  place-items:center;
  border:1px solid var(--line-strong);
  color:var(--accent);
  font-size:10px;
  font-weight:700;
  background:var(--bg-raised);
}

.chain-body{padding-top:2px}

.chain-body strong,
.history-body strong{
  display:block;
  color:var(--text);
  font-weight:620;
}

.chain-body strong{margin-bottom:3px}
.history-body strong{margin-bottom:4px}

.chain-body span,
.history-body span{
  display:block;
  color:var(--muted);
  font-size:15px;
}

.chain-connector{
  width:1px;
  height:19px;
  margin:4px 0 4px 14px;
  background:var(--line-strong);
}

.boundary-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
  margin-top:38px;
}

.boundary-card{
  padding:26px 28px;
  border:1px solid var(--line);
  background:var(--panel-soft);
}

.boundary-card strong{
  display:block;
  margin-bottom:8px;
  color:var(--text);
  font-size:17px;
  font-weight:620;
}

.boundary-card span{
  display:block;
  color:var(--muted);
  font-size:14px;
}

.lifecycle{
  display:grid;
  grid-template-columns:repeat(5,minmax(0,1fr));
  gap:10px;
  margin-top:38px;
}

.lifecycle-step{
  min-height:160px;
  padding:20px;
  border:1px solid var(--line);
  background:var(--panel-soft);
}

.lifecycle-step small{
  display:block;
  margin-bottom:24px;
  color:var(--faint);
  font-size:10px;
  font-weight:700;
  letter-spacing:.13em;
}

.lifecycle-step strong{
  display:block;
  margin-bottom:8px;
  color:var(--text);
  font-size:16px;
  line-height:1.25;
  font-weight:620;
}

.lifecycle-step span{
  color:var(--muted);
  font-size:13px;
  line-height:1.5;
}

/* Signatory */
.action-grid,
.mode-grid,
.object-grid,
.provenance-grid,
.phase-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
  margin-top:38px;
}

.action-card{
  min-height:220px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

.action-card small,
.mode-card small,
.object-card small,
.provenance-card small,
.time-card small{margin-bottom:28px}

.page-signatory .sequence-row{
  grid-template-columns:62px minmax(175px,.72fr) minmax(0,1.5fr);
  padding:23px 0;
}

.exact-version,
.record-model,
.history-flow,
.lifecycle-map{
  margin-top:40px;
  padding:30px;
  border:1px solid var(--line);
  background:var(--panel-soft);
}

.version-flow{
  display:grid;
  grid-template-columns:1fr auto 1fr auto 1fr;
  gap:14px;
  align-items:center;
}

.version-node{
  min-height:128px;
  padding:22px;
  border:1px solid var(--line);
  background:var(--bg-raised);
}

.version-node small{
  display:block;
  margin-bottom:18px;
  color:var(--faint);
  font-size:10px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
}

.version-node strong{
  display:block;
  margin-bottom:7px;
  color:var(--text);
  font-size:16px;
  line-height:1.28;
}

.version-node span{
  display:block;
  color:var(--muted);
  font-size:13px;
}

.version-arrow{
  color:var(--faint);
  font-size:17px;
}

.mode-card,
.provenance-card{
  padding:28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

.evidence-list,
.creation-list,
.change-list{
  margin-top:38px;
  border-top:1px solid var(--line-strong);
}

.evidence-row{
  display:grid;
  grid-template-columns:54px minmax(155px,.65fr) minmax(0,1.5fr);
  gap:20px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}

.institutional-note{
  max-width:900px;
  margin-top:36px;
  padding-top:28px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:16px;
}

/* Records */
.object-card{
  min-height:205px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

.record-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding-bottom:20px;
  margin-bottom:4px;
  border-bottom:1px solid var(--line-strong);
}

.record-head strong{
  color:var(--text);
  font-size:20px;
  font-weight:620;
}

.record-head span{
  color:var(--faint);
  font-size:11px;
  font-weight:700;
  letter-spacing:.11em;
  text-transform:uppercase;
}

.record-row{
  display:grid;
  grid-template-columns:minmax(150px,.62fr) minmax(0,1.5fr);
  gap:24px;
  padding:19px 0;
  border-bottom:1px solid var(--line);
}

.record-row:last-child{border-bottom:0}

.record-label{
  color:var(--text);
  font-size:14px;
  font-weight:620;
}

.record-value{
  color:var(--muted);
  font-size:14px;
}

.creation-row{
  display:grid;
  grid-template-columns:60px minmax(170px,.7fr) minmax(0,1.5fr);
  gap:22px;
  padding:23px 0;
  border-bottom:1px solid var(--line);
}

.history-item{
  display:grid;
  grid-template-columns:60px minmax(0,1fr);
  gap:18px;
  align-items:start;
}

.history-item+.history-item{margin-top:22px}

.history-id{
  width:52px;
  min-height:30px;
  display:grid;
  place-items:center;
  border:1px solid var(--line-strong);
  color:var(--accent);
  font-size:10px;
  font-weight:700;
  letter-spacing:.05em;
  background:var(--bg-raised);
}

.history-connector{
  width:1px;
  height:20px;
  margin:5px 0 5px 25px;
  background:var(--line-strong);
}

.retrieval-box,
.reconstruction-box{
  margin-top:40px;
  padding:30px;
  border:1px solid var(--line-strong);
  background:linear-gradient(140deg,rgba(169,214,223,.045),rgba(255,255,255,.008));
}

.retrieval-box p,
.reconstruction-box p{
  margin-bottom:0;
  color:var(--muted);
  font-size:16px;
}

.retrieval-box strong,
.reconstruction-box strong{
  color:var(--text);
  font-weight:620;
}

/* Lifecycle */
.lifecycle-map{margin-top:42px}

.map-step{
  display:grid;
  grid-template-columns:60px minmax(180px,.7fr) minmax(0,1.5fr);
  gap:22px;
  align-items:start;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}

.map-step:last-child{border-bottom:0}

.map-index{
  width:44px;
  height:30px;
  display:grid;
  place-items:center;
  border:1px solid var(--line-strong);
  background:var(--bg-raised);
  color:var(--accent);
  font-size:10px;
  font-weight:700;
  letter-spacing:.06em;
}

.phase-card{
  min-height:215px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

.phase-card small{margin-bottom:30px}

.change-row{
  display:grid;
  grid-template-columns:56px minmax(170px,.7fr) minmax(0,1.5fr);
  gap:22px;
  padding:23px 0;
  border-bottom:1px solid var(--line);
}

.time-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
  margin-top:38px;
}

.time-card{
  min-height:210px;
  padding:26px 28px;
  border:1px solid var(--line);
  background:linear-gradient(155deg,var(--panel),#0a0f12);
}

/* 404 */
.not-found{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:40px 0;
}

.not-found-panel{
  width:min(100%,720px);
  padding:clamp(30px,7vw,64px);
  border:1px solid var(--line-strong);
  background:var(--panel);
  box-shadow:var(--shadow);
}

.not-found-panel h1{font-size:clamp(40px,8vw,68px)}

.not-found-panel p{
  max-width:560px;
  margin-bottom:30px;
  color:var(--muted);
  font-size:18px;
}

.return-link{
  min-height:44px;
  padding:9px 14px;
  display:inline-flex;
  align-items:center;
  border:1px solid var(--line-strong);
  color:var(--accent-strong);
  text-decoration:underline;
  text-underline-offset:.2em;
}

.site-footer{padding:46px 0 58px}

.footer-grid{
  display:grid;
  grid-template-columns:1fr auto;
  gap:32px;
  align-items:end;
}

.footer-brand{
  margin-bottom:8px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.footer-copy{
  max-width:670px;
  margin:0;
  color:var(--faint);
  font-size:12px;
}

.footer-links{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:12px 20px;
  color:var(--muted);
  font-size:12px;
}

.footer-links a:hover{color:var(--text)}

@media(max-width:1020px){
  .authority-types{grid-template-columns:1fr}
  .lifecycle{grid-template-columns:repeat(2,minmax(0,1fr))}
  .version-flow{grid-template-columns:1fr}
  .version-arrow{transform:rotate(90deg);justify-self:center}
  .time-grid{grid-template-columns:1fr}
}

@media(max-width:920px){
  .header-inner{
    min-height:auto;
    padding:18px 0;
    align-items:flex-start;
    flex-direction:column;
  }

  .primary-nav{justify-content:flex-start}
  .hero{padding-top:72px}
  .section-grid{grid-template-columns:1fr;gap:32px}
  .section-kicker{position:static}
}

@media(max-width:640px){
  .shell{width:min(calc(100% - 28px),var(--max))}
  .site-header{position:static}
  .primary-nav{gap:9px 14px}
  .hero{padding:60px 0 64px}
  h1{font-size:clamp(40px,12vw,58px)}
  .section{padding:66px 0}

  .principles,
  .contrast,
  .boundary-grid,
  .lifecycle,
  .action-grid,
  .mode-grid,
  .object-grid,
  .provenance-grid,
  .phase-grid,
  .time-grid{
    grid-template-columns:1fr;
  }

  .contrast-divider{display:none}

  .sequence-row,
  .evidence-row,
  .dimension-row,
  .creation-row,
  .map-step,
  .change-row{
    grid-template-columns:42px 1fr;
  }

  .sequence-copy,
  .evidence-copy,
  .dimension-copy,
  .creation-copy,
  .map-copy,
  .change-copy{
    grid-column:2;
  }

  .record-row{grid-template-columns:1fr;gap:8px}
  .footer-grid{grid-template-columns:1fr}
  .footer-links{justify-content:flex-start}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important}
}