/* Zeta Strategy — technical brief */
:root {
  --ink: #08131b;
  --ink-2: #10212b;
  --paper: #f1f0e9;
  --paper-2: #e4e4da;
  --mint: #b8f5d0;
  --mint-2: #84e8af;
  --coral: #ff7a59;
  --coral-paper: #b9432f;
  --muted-dark: #89969e;
  --muted-light: #5c686e;
  --line-dark: rgba(241, 240, 233, .15);
  --line-light: rgba(8, 19, 27, .18);
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", Baskerville, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --page: min(92vw, 1500px);
  --pad: clamp(22px, 4vw, 64px);
  --ease: cubic-bezier(.22, 1, .36, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  background: var(--ink);
}

body {
  margin: 0;
  color: var(--paper);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
img, svg { display: block; max-width: 100%; }
p, h1, h2, h3, figure, dl, dd { margin-top: 0; }

::selection { color: var(--ink); background: var(--mint); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 11px 16px;
  color: var(--ink);
  background: var(--mint);
  transform: translateY(-160%);
  transition: transform .2s;
}

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

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  width: 100%;
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad);
  border-bottom: 1px solid transparent;
  transition: height .3s, background .3s, border-color .3s;
}

.site-header.is-scrolled {
  height: 70px;
  background: rgba(8, 19, 27, .9);
  border-color: var(--line-dark);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.wordmark {
  position: relative;
  z-index: 102;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.wordmark__mark {
  width: 29px;
  height: 29px;
  overflow: visible;
  fill: none;
  stroke: var(--mint);
  stroke-width: 2.1;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.wordmark__mark circle {
  fill: var(--coral);
  stroke: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(22px, 3vw, 48px);
  font-size: 13px;
}

.site-nav a {
  position: relative;
  color: rgba(241, 240, 233, .68);
  transition: color .2s;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 1px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .3s var(--ease);
}

.site-nav a:hover,
.site-nav a[aria-current="true"] { color: var(--paper); }
.site-nav a:hover::after,
.site-nav a[aria-current="true"]::after { transform: scaleX(1); transform-origin: left; }
.menu-toggle { display: none; }

.brief-hero {
  width: var(--page);
  min-height: auto;
  margin: 0 auto;
  padding: 102px 0 28px;
}

.brief-meta {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 0 14px;
  color: var(--muted-dark);
  border-top: 1px solid var(--line-dark);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.brief-hero__statement {
  padding: clamp(24px, 2.2vw, 34px) 0 clamp(30px, 2.8vw, 42px);
}

.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 900px;
  margin-bottom: 22px;
  color: rgba(241, 240, 233, .76);
  font-size: clamp(15px, 1.05vw, 18px);
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: -.01em;
}

.kicker span {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 122, 89, .13);
}

.brief-hero h1 {
  max-width: 980px;
  margin-bottom: 0;
  font-size: clamp(38px, 3.1vw, 58px);
  font-weight: 480;
  line-height: .96;
  letter-spacing: -.035em;
}

.brief-hero h1 em {
  display: block;
  margin-top: .08em;
  color: var(--mint);
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -.025em;
}

.brief-hero__intro {
  color: rgba(241, 240, 233, .72);
  font-size: 16px;
  line-height: 1.65;
}

.brief-hero__intro p { margin-bottom: 1.35em; }
.brief-hero__intro p:last-child { margin-bottom: 0; }

.system-view {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line-dark);
  background:
    linear-gradient(rgba(255, 255, 255, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .022) 1px, transparent 1px),
    #0a1821;
  background-size: 32px 32px;
}

.system-view__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 58px;
  margin: 0 22px;
  border-bottom: 1px solid var(--line-dark);
}

.system-view__topline,
.system-view__conditions,
.flow-stage__index,
.flow-analysis dt {
  color: var(--muted-dark);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--mint);
}

.live-indicator i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint-2);
  box-shadow: 0 0 0 5px rgba(132, 232, 175, .1);
}

.assessment-flow {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) 52px minmax(0, 1fr) 52px minmax(0, .9fr);
  min-height: 320px;
}

.flow-stage {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: clamp(26px, 3.3vw, 50px);
  border-right: 1px solid var(--line-dark);
  background: rgba(8, 19, 27, .2);
}

.flow-stage__index { display: block; margin-bottom: 22px; color: var(--mint); }

.flow-stage__title {
  margin-bottom: auto;
  font-family: var(--serif);
  font-size: clamp(25px, 2.4vw, 37px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -.025em;
}

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--mint);
  border-right: 1px solid var(--line-dark);
  font-family: var(--mono);
  font-size: 18px;
  font-style: normal;
}

.flow-components {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 38px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
  list-style: none;
}

.flow-components li {
  padding: 11px 12px;
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  color: rgba(241, 240, 233, .76);
  font-size: 11px;
}

.flow-analysis { margin: 38px 0 0; border-top: 1px solid var(--line-dark); }

.flow-analysis > div {
  display: grid;
  grid-template-columns: minmax(96px, .8fr) 1.2fr;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-dark);
}

.flow-analysis dd {
  margin: 0;
  color: rgba(241, 240, 233, .72);
  font-size: 11px;
}

.flow-stage--output {
  color: var(--paper);
  border-right: 0;
  background: rgba(132, 232, 175, .035);
  box-shadow: inset 0 3px 0 var(--mint);
}

.flow-stage--output .flow-stage__index,
.flow-stage--output .flow-stage__title { color: var(--mint); }

.flow-output {
  margin: 38px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.flow-output li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-dark);
  color: rgba(241, 240, 233, .78);
  font-size: 12px;
  font-weight: 500;
}

.system-view__conditions {
  display: grid;
  grid-template-columns: 1.15fr repeat(4, 1fr);
  border-top: 1px solid var(--line-dark);
}

.system-view__conditions > * { padding: 13px 14px; border-right: 1px solid var(--line-dark); }
.system-view__conditions > *:last-child { border-right: 0; }
.system-view__conditions strong { color: var(--mint); font-weight: 500; }

.signal-rail {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 2vw, 34px);
  padding: 20px var(--pad);
  color: var(--ink);
  background: var(--mint);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.signal-rail i {
  width: clamp(30px, 6vw, 94px);
  height: 1px;
  background: rgba(8, 19, 27, .35);
}

.dossier {
  display: grid;
  grid-template-columns: minmax(220px, 24vw) minmax(0, 1fr);
  color: var(--ink);
  background: var(--paper);
}

.dossier-index {
  align-self: start;
  position: sticky;
  top: 70px;
  min-height: calc(100vh - 70px);
  padding: clamp(54px, 6vw, 92px) clamp(28px, 3.5vw, 58px);
  border-right: 1px solid var(--line-light);
}

.dossier-index > p:first-child {
  margin-bottom: 28px;
  color: var(--muted-light);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.dossier-index ol { margin: 0; padding: 0; list-style: none; }
.dossier-index li { border-top: 1px solid var(--line-light); }
.dossier-index li:last-child { border-bottom: 1px solid var(--line-light); }

.dossier-index li a {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 8px;
  padding: 14px 0;
  font-size: 13px;
  transition: color .2s, padding-left .25s var(--ease);
}

.dossier-index li a:hover { color: #23754a; padding-left: 4px; }
.dossier-index li span { color: var(--muted-light); font-family: var(--mono); font-size: 9px; }

.dossier-index__note {
  max-width: 250px;
  margin: clamp(70px, 14vh, 150px) 0 0;
  color: var(--muted-light);
  font-family: var(--serif);
  font-size: 19px;
  font-style: italic;
  line-height: 1.45;
}

.dossier-body { min-width: 0; }

.dossier-section {
  padding: clamp(76px, 9vw, 144px) clamp(28px, 6vw, 104px);
  border-bottom: 1px solid var(--line-light);
}

.dossier-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(250px, .55fr);
  column-gap: clamp(50px, 9vw, 150px);
  align-items: end;
  margin-bottom: clamp(54px, 7vw, 100px);
}

.section-index {
  grid-column: 1 / -1;
  margin-bottom: 20px;
  color: var(--muted-light);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.dossier-heading h2 {
  max-width: 820px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 5vw, 76px);
  font-weight: 400;
  line-height: .98;
  letter-spacing: -.045em;
}

.dossier-heading > p:last-child {
  margin-bottom: .35em;
  color: var(--muted-light);
  font-size: 15px;
  line-height: 1.65;
}

.about .dossier-heading { grid-template-columns: 1fr; }

.about .dossier-heading h2 {
  max-width: 1120px;
  font-size: clamp(50px, 5.5vw, 84px);
}

.about .dossier-heading > p:last-child {
  max-width: 660px;
  margin-top: 32px;
}

.about-brief {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr);
  gap: clamp(54px, 8vw, 130px);
  padding: clamp(34px, 5vw, 72px) 0;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.about-brief__lead {
  max-width: 760px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(29px, 3.3vw, 50px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.about-brief__details { align-self: end; margin-bottom: 0; border-top: 1px solid var(--line-light); }

.about-brief__details > div {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-light);
}

.about-brief__details dt {
  color: #347956;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.about-brief__details dd {
  margin: 0;
  color: var(--muted-light);
  font-size: 14px;
  line-height: 1.55;
}

.work .dossier-heading { grid-template-columns: 1fr; margin-bottom: 16px; }

.work-entry {
  display: grid;
  grid-template-columns: minmax(150px, .34fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 100px);
  padding: clamp(52px, 7vw, 96px) 0;
  border-top: 1px solid var(--line-light);
}

.work-entry:last-child { padding-bottom: 0; }

.work-entry__label span {
  display: block;
  margin-bottom: 26px;
  color: var(--coral-paper);
  font-family: var(--serif);
  font-size: 76px;
  font-style: italic;
  line-height: .8;
}

.work-entry__label p {
  margin-bottom: 0;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.5;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.work-entry__body { max-width: 900px; }

.work-entry__lead {
  max-width: 820px;
  margin-bottom: 28px;
  font-family: var(--serif);
  font-size: clamp(27px, 3.2vw, 48px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.work-entry__body > p:not(.work-entry__lead) {
  max-width: 690px;
  margin-bottom: 44px;
  color: var(--muted-light);
  line-height: 1.7;
}

.work-entry dl { margin-bottom: 0; border-top: 1px solid var(--line-light); }

.work-entry dl > div {
  display: grid;
  grid-template-columns: minmax(90px, .3fr) 1fr;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-light);
}

.work-entry dt {
  color: var(--muted-light);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.work-entry dd { margin: 0; font-size: 14px; }

.assessment { background: var(--mint); }

.assessment-grid {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  border: 1px solid rgba(8, 19, 27, .3);
}

.assessment-grid > div { padding: clamp(28px, 4vw, 62px); }
.assessment-grid__scope { border-right: 1px solid rgba(8, 19, 27, .3); }

.assessment-grid > div > p:first-child {
  margin-bottom: 42px;
  color: rgba(8, 19, 27, .7);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.assessment-grid ul { margin: 0; padding: 0; list-style: none; }

.assessment-grid li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid rgba(8, 19, 27, .22);
  font-size: 14px;
}

.assessment-grid li:last-child { border-bottom: 1px solid rgba(8, 19, 27, .22); }
.assessment-grid li span { font-family: var(--mono); font-size: 9px; }

.assessment-grid__output h3 {
  max-width: 540px;
  margin-bottom: 24px;
  font-family: var(--serif);
  font-size: clamp(38px, 4vw, 62px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.045em;
}

.assessment-grid__output p:last-child {
  max-width: 560px;
  margin-bottom: 0;
  color: rgba(8, 19, 27, .65);
  line-height: 1.7;
}

.notes-list { margin-bottom: 0; border-top: 1px solid var(--line-light); }

.notes-list > div {
  display: grid;
  grid-template-columns: minmax(56px, .12fr) 1fr;
  padding: clamp(24px, 3vw, 42px) 0;
  border-bottom: 1px solid var(--line-light);
}

.notes-list dt { color: #347956; font-family: var(--mono); font-size: 10px; }

.notes-list dd {
  display: grid;
  grid-template-columns: minmax(250px, .9fr) minmax(240px, 1fr);
  gap: clamp(32px, 7vw, 120px);
  margin: 0;
}

.notes-list strong {
  max-width: 520px;
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 34px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -.025em;
}

.notes-list dd span {
  max-width: 480px;
  color: var(--muted-light);
  font-size: 14px;
  line-height: 1.65;
}

.contact {
  min-height: 390px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 70px;
  padding: clamp(64px, 8vw, 120px) var(--pad);
  border-bottom: 1px solid var(--line-dark);
}

.contact > div > p:last-child { margin-bottom: 0; color: var(--muted-dark); font-size: 14px; }
.contact .section-index { color: var(--mint); }

.contact > a {
  align-self: flex-start;
  max-width: 100%;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(184, 245, 208, .45);
  color: var(--mint);
  font-family: var(--serif);
  font-size: clamp(25px, 4.5vw, 68px);
  line-height: 1.05;
  letter-spacing: -.03em;
  overflow-wrap: anywhere;
  transition: color .2s, border-color .2s;
}

.contact > a:hover { color: var(--paper); border-color: var(--paper); }
.contact > a span { color: var(--coral); font-family: var(--sans); font-size: .55em; }

.site-footer {
  min-height: 120px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: center;
  padding: 32px var(--pad);
  color: var(--muted-dark);
  font-size: 11px;
}

.site-footer .wordmark { color: var(--paper); font-size: 14px; }
.site-footer .wordmark__mark { width: 24px; height: 24px; }
.site-footer p { margin: 0; }
.site-footer p:last-child { justify-self: end; }

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

.reveal.is-visible { opacity: 1; transform: none; }

.error-page { min-height: 100vh; }
.error-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px var(--pad) clamp(58px, 8vw, 110px);
}

.error-shell > div { max-width: 900px; }
.error-shell h1 {
  margin-bottom: 26px;
  font-family: var(--serif);
  font-size: clamp(56px, 9vw, 130px);
  font-weight: 400;
  line-height: .88;
  letter-spacing: -.06em;
}

.error-shell > div > p:not(.kicker) { color: var(--muted-dark); }

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  gap: 36px;
  margin-top: 18px;
  padding: 0 18px;
  border: 1px solid currentColor;
  font-size: 13px;
  transition: color .2s, background .2s;
}

.button--light { color: var(--ink); background: var(--mint); border-color: var(--mint); }
.button--light:hover { color: var(--paper); background: transparent; }

@media (max-width: 1180px) {
  .assessment-flow { grid-template-columns: minmax(0, 1.05fr) 38px minmax(0, 1fr) 38px minmax(0, .95fr); }
  .flow-stage { padding: 30px 26px; }
  .dossier { grid-template-columns: 230px minmax(0, 1fr); }
  .dossier-heading { grid-template-columns: 1fr; }
  .dossier-heading > p:last-child { max-width: 600px; margin-top: 28px; }
  .notes-list dd { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 900px) {
  :root { --page: calc(100vw - 48px); }
  html { scroll-padding-top: 76px; }
  .site-header { height: 72px; padding: 0 24px; }
  .site-header.is-scrolled { height: 64px; }

  .menu-toggle {
    position: relative;
    z-index: 102;
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    gap: 7px;
    padding: 0;
    background: transparent;
    border: 0;
    cursor: pointer;
  }

  .menu-toggle > span:not(.sr-only) {
    width: 24px;
    height: 1px;
    display: block;
    background: var(--paper);
    transition: transform .25s, opacity .25s;
  }

  .menu-toggle[aria-expanded="true"] > span:nth-of-type(2) { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] > span:nth-of-type(3) { transform: translateY(-4px) rotate(-45deg); }

  .site-nav {
    position: fixed;
    z-index: 101;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 8px;
    padding: 84px 24px 40px;
    background: var(--ink);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .25s, visibility .25s;
  }

  .site-nav.is-open { opacity: 1; visibility: visible; pointer-events: auto; }
  .site-nav a {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--line-dark);
    color: var(--paper);
    font-family: var(--serif);
    font-size: clamp(34px, 8vw, 56px);
    line-height: 1.05;
  }
  .site-nav a::after { display: none; }

  .brief-hero { min-height: auto; padding: 92px 0 30px; }
  .brief-hero__statement { padding: 34px 0 40px; }
  .brief-hero h1 { font-size: clamp(46px, 8vw, 64px); }
  .brief-hero__intro { max-width: 640px; }

  .assessment-flow { grid-template-columns: 1fr; }
  .flow-stage { min-height: 280px; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .flow-arrow { min-height: 48px; border-right: 0; border-bottom: 1px solid var(--line-dark); font-size: 0; }
  .flow-arrow::after { content: "↓"; font-size: 18px; }
  .flow-stage--output { min-height: 250px; border-bottom: 0; }
  .system-view__conditions { grid-template-columns: repeat(2, 1fr); }
  .system-view__conditions strong { grid-column: 1 / -1; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .system-view__conditions span:nth-of-type(2) { border-right: 0; }
  .system-view__conditions span:nth-of-type(-n+2) { border-bottom: 1px solid var(--line-dark); }

  .dossier { grid-template-columns: 1fr; }
  .dossier-index {
    position: static;
    min-height: 0;
    padding: 42px 24px;
    border-right: 0;
    border-bottom: 1px solid var(--line-light);
  }
  .dossier-index > p:first-child { margin-bottom: 16px; }
  .dossier-index ol { display: grid; grid-template-columns: repeat(2, 1fr); }
  .dossier-index li:nth-child(2) { border-top: 1px solid var(--line-light); }
  .dossier-index li:nth-child(odd) { padding-right: 20px; }
  .dossier-index li:nth-child(even) { padding-left: 20px; border-left: 1px solid var(--line-light); }
  .dossier-index li:nth-last-child(2) { border-bottom: 1px solid var(--line-light); }
  .dossier-index__note { max-width: 500px; margin-top: 36px; }

  .dossier-section { padding: 78px 24px; }
  .dossier-heading { margin-bottom: 54px; }
  .about-brief { grid-template-columns: 1fr; gap: 44px; }
  .work-entry { grid-template-columns: 125px 1fr; gap: 34px; }
  .assessment-grid { grid-template-columns: 1fr; }
  .assessment-grid__scope { border-right: 0; border-bottom: 1px solid rgba(8, 19, 27, .3); }

  .site-footer { grid-template-columns: 1fr auto; }
  .site-footer p:nth-child(2) { display: none; }
}

@media (max-width: 620px) {
  :root { --page: calc(100vw - 36px); }
  .site-header { padding: 0 18px; }
  .wordmark { font-size: 15px; }

  .brief-meta { align-items: flex-start; }
  .brief-meta span:last-child { max-width: 130px; text-align: right; }
  .brief-hero__statement { padding: 32px 0 38px; }
  .brief-hero h1 { font-size: clamp(34px, 9vw, 40px); }
  .brief-hero__intro { font-size: 15px; }
  .kicker { margin-bottom: 18px; }

  .system-view__topline { min-height: 52px; margin: 0 14px; }
  .flow-stage { min-height: 260px; padding: 25px 20px; }
  .flow-stage__title { font-size: 28px; }
  .flow-components,
  .flow-analysis,
  .flow-output { margin-top: 30px; }
  .flow-analysis > div { grid-template-columns: 76px 1fr; gap: 10px; }
  .flow-stage--output { min-height: 225px; }
  .system-view__conditions > * { padding: 11px 8px; font-size: 8px; }

  .signal-rail { justify-content: space-between; gap: 8px; padding: 18px; font-size: 8px; }
  .signal-rail i { flex: 1; min-width: 8px; }

  .dossier-index { padding: 36px 18px; }
  .dossier-index ol { grid-template-columns: 1fr; }
  .dossier-index li:nth-child(n) { padding-right: 0; padding-left: 0; border-left: 0; }
  .dossier-index li:nth-child(n+2) { border-top: 0; }
  .dossier-index li:nth-last-child(2) { border-bottom: 0; }

  .dossier-section { padding: 68px 18px; }
  .dossier-heading { margin-bottom: 44px; }
  .dossier-heading h2 { font-size: clamp(38px, 12vw, 58px); }
  .dossier-heading > p:last-child { margin-top: 24px; }
  .about .dossier-heading h2 { font-size: 42px; }

  .about-brief { gap: 34px; padding: 32px 0; }
  .about-brief__lead { font-size: 31px; }
  .about-brief__details > div { grid-template-columns: 72px 1fr; gap: 12px; }

  .work-entry { grid-template-columns: 1fr; gap: 34px; padding: 54px 0; }
  .work-entry__label { display: flex; align-items: flex-end; gap: 22px; }
  .work-entry__label span { margin: 0; font-size: 64px; }
  .work-entry__lead { font-size: 29px; }
  .work-entry__body > p:not(.work-entry__lead) { margin-bottom: 34px; }
  .work-entry dl > div { grid-template-columns: 76px 1fr; gap: 10px; }

  .assessment-grid > div { padding: 26px 22px; }
  .assessment-grid__output h3 { font-size: 38px; }

  .notes-list > div { grid-template-columns: 36px 1fr; gap: 8px; }
  .notes-list dd { grid-template-columns: 1fr; }
  .notes-list strong { font-size: 24px; }

  .contact { min-height: 330px; padding: 64px 18px; }
  .contact > a { font-size: clamp(18px, 6vw, 30px); }

  .site-footer { padding: 28px 18px; }
  .site-footer p:last-child { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
  .reveal { opacity: 1; transform: none; }
}