:root {
  --paper: #f6f3eb;
  --paper-soft: #eee9dd;
  --ink: #171819;
  --muted: #5a5b5a;
  --rule: #373a3d;
  --blue: #0756ca;
  --blue-dark: #0646aa;
  --yellow: #f0dc00;
  --serif: "Iowan Old Style", "Baskerville", "Times New Roman", serif;
  --sans: "Helvetica Neue", "Arial Narrow", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  background: var(--blue);
}
body {
  margin: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; }

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

.skip-link {
  position: fixed;
  left: 18px;
  top: 12px;
  z-index: 100;
  transform: translateY(-160%);
  padding: 11px 15px;
  background: var(--ink);
  color: white;
}
.skip-link:focus { transform: none; }

.site-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  background: var(--paper);
}
.chapter-nav {
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 0 22px;
  background: var(--blue);
  color: white;
}
.guide-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
}
.guide-mark img {
  width: 31px;
  height: 31px;
}
.chapter-nav nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-evenly;
  padding: 25px 0 8px;
}
.chapter-nav nav a {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  text-decoration: none;
  text-transform: uppercase;
  font: 700 10px/1 var(--mono);
  letter-spacing: .14em;
}
.chapter-nav nav a:hover { color: var(--yellow); }
.site-content { min-width: 0; overflow: clip; }

.masthead {
  display: none;
  min-height: 74px;
  padding: 0 clamp(28px, 5vw, 72px);
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 34px;
  border-bottom: 1px solid var(--rule);
}
.wordmark {
  text-decoration: none;
  text-transform: uppercase;
  font: 700 13px/1 var(--mono);
  letter-spacing: .14em;
}
.masthead p {
  margin: 0;
  color: var(--muted);
  font: 10px/1.35 var(--mono);
}
.masthead p strong { color: var(--ink); }
.sponsor-link,
.primary-link,
.definition a {
  width: max-content;
  color: var(--blue);
  text-decoration: none;
  text-transform: uppercase;
  font: 700 11px/1 var(--mono);
  letter-spacing: .12em;
  border-bottom: 2px solid var(--yellow);
  padding-bottom: 7px;
}
.sponsor-link:hover,
.primary-link:hover,
.definition a:hover { color: var(--ink); }

.hero {
  min-height: 670px;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(360px, 1fr);
  border-bottom: 1px solid var(--rule);
}
.hero-copy {
  padding: 48px clamp(34px, 5vw, 74px) 32px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  align-items: end;
}
.hero h1 {
  margin: 0;
  text-transform: uppercase;
  font: 800 clamp(88px, 10.2vw, 164px)/.86 var(--sans);
  letter-spacing: -.08em;
}
.hero h1 span { display: block; }
.hero-definition {
  max-width: 510px;
  margin-top: 46px;
}
.eyebrow,
.section-tag {
  margin: 0 0 22px;
  text-transform: uppercase;
  font: 700 12px/1.25 var(--mono);
  letter-spacing: .18em;
}
.eyebrow::before,
.section-tag::before {
  content: "";
  display: block;
  width: 26px;
  margin-bottom: 22px;
  border-top: 3px solid var(--yellow);
}
.hero-definition > p:nth-child(2) {
  max-width: 55ch;
  margin: 0 0 25px;
  color: #292b2d;
  font: 16px/1.48 var(--sans);
}
.field-note {
  margin: 42px 0 0;
  font: italic 20px/1.2 var(--serif);
}
.hero-plate {
  margin: 0;
  padding: 30px clamp(28px, 4vw, 60px);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid var(--rule);
}
.hero-plate img {
  width: min(100%, 430px);
  max-height: 500px;
  margin: 0 auto;
  object-fit: contain;
}
.hero-plate figcaption {
  max-width: 430px;
  margin: 10px auto 0;
  color: var(--muted);
  font: 9px/1.45 var(--mono);
}

.essentials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--rule);
}
.essentials article {
  min-height: 240px;
  padding: 38px clamp(26px, 3vw, 48px);
}
.essentials article + article { border-left: 1px solid var(--rule); }
.essentials h2 {
  margin: 0 0 34px;
  text-transform: uppercase;
  font: 700 16px/1 var(--mono);
  letter-spacing: .14em;
}
.essentials h2::after {
  content: "";
  display: block;
  width: 24px;
  margin-top: 22px;
  border-top: 3px solid var(--yellow);
}
.essentials p {
  max-width: 42ch;
  margin: 0;
  font: 15px/1.55 var(--sans);
}

.definition {
  min-height: 560px;
  padding: 100px clamp(36px, 7vw, 110px);
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) minmax(280px, 430px);
  gap: 50px;
  align-items: start;
  border-bottom: 1px solid var(--rule);
}
.definition > .section-tag { margin-top: 10px; }
.definition h2,
.section-intro h2,
.experience-copy > h2,
.boise-note h2,
.questions h2 {
  margin: 0;
  font: 800 clamp(48px, 5.5vw, 88px)/.95 var(--sans);
  letter-spacing: -.055em;
}
.definition > div > p {
  margin: 9px 0 34px;
  font: 20px/1.5 var(--serif);
}

.process {
  padding: 100px clamp(36px, 7vw, 110px) 110px;
  background: var(--blue);
  color: white;
}
.section-intro {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) minmax(260px, 390px);
  gap: 50px;
  align-items: end;
}
.process .section-tag::before { border-color: var(--yellow); }
.section-intro > p:last-child {
  margin: 0 0 8px;
  color: rgba(255,255,255,.8);
  font: 17px/1.5 var(--sans);
}
.process-image {
  margin: 70px 0 0 230px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 24px;
  align-items: end;
}
.process-image img {
  width: 100%;
  height: clamp(620px, 62vw, 820px);
  object-fit: contain;
  object-position: center;
  border: 1px solid rgba(255,255,255,.5);
}
.process-image figcaption {
  color: rgba(255,255,255,.84);
  font: 10px/1.55 var(--mono);
}
.process-list {
  margin: 58px 0 0 230px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid rgba(255,255,255,.55);
}
.process-step {
  min-height: 190px;
  padding: 25px 22px 0 0;
}
.process-step + .process-step {
  padding-left: 22px;
  border-left: 1px solid rgba(255,255,255,.55);
}
.process-step h3 {
  margin: 0 0 22px;
  text-transform: uppercase;
  color: var(--yellow);
  font: 700 12px/1 var(--mono);
  letter-spacing: .14em;
}
.process-step p {
  margin: 0;
  color: rgba(255,255,255,.82);
  font: 14px/1.5 var(--sans);
}

.experience {
  display: grid;
  grid-template-columns: minmax(360px, .9fr) minmax(0, 1.1fr);
  border-bottom: 1px solid var(--rule);
}
.experience > figure {
  margin: 0;
  position: relative;
  align-self: start;
  background: var(--paper-soft);
  border-right: 1px solid var(--rule);
}
.experience > figure img {
  width: 100%;
  height: auto;
  min-height: 0;
  object-fit: contain;
}
.experience > figure figcaption {
  position: absolute;
  inset: auto 0 0;
  padding: 18px 24px;
  background: rgba(246,243,235,.94);
  font: 9px/1.5 var(--mono);
}
.experience-copy { padding: 100px clamp(36px, 7vw, 110px); }
.experience-intro {
  max-width: 58ch;
  margin: 35px 0 60px;
  font: 19px/1.55 var(--serif);
}
.experience-list { border-top: 1px solid var(--rule); }
.experience-item {
  padding: 25px 0;
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 30px;
  border-bottom: 1px solid var(--rule);
}
.experience-item h3 {
  margin: 0;
  text-transform: uppercase;
  font: 700 11px/1.3 var(--mono);
  letter-spacing: .1em;
}
.experience-item p { margin: 0; font: 15px/1.5 var(--sans); }

.reference { padding: 100px clamp(36px, 7vw, 110px) 115px; }
.reference .section-intro { color: var(--ink); }
.reference .section-intro > p:last-child { color: var(--muted); }
.reference-table {
  margin: 65px 0 0 230px;
  border-top: 2px solid var(--ink);
}
.reference-row {
  display: grid;
  grid-template-columns: .65fr 1fr 1fr;
  border-bottom: 1px solid var(--rule);
}
.reference-row > * { padding: 18px 20px 18px 0; font: 14px/1.45 var(--sans); }
.reference-row > * + * { padding-left: 20px; border-left: 1px solid var(--rule); }
.reference-row strong { text-transform: uppercase; font: 700 10px/1.4 var(--mono); letter-spacing: .1em; }
.reference-header { color: var(--blue); }

.boise-note {
  padding: 90px clamp(36px, 7vw, 110px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, .6fr);
  gap: 90px;
  background: var(--paper-soft);
  border-top: 1px solid var(--rule);
}
.boise-note > div > p:last-child {
  max-width: 64ch;
  margin: 34px 0 0;
  font: 18px/1.55 var(--serif);
}
.boise-note aside {
  padding-left: 34px;
  border-left: 4px solid var(--yellow);
}
.boise-note aside span,
.sponsor-band span {
  display: block;
  margin-bottom: 9px;
  text-transform: uppercase;
  font: 700 9px/1 var(--mono);
  letter-spacing: .14em;
}
.boise-note aside strong {
  font: 700 20px/1.2 var(--mono);
  text-transform: uppercase;
}
.boise-note aside p { margin: 20px 0 0; font: 14px/1.5 var(--sans); }
.sponsor-name-link,
.sponsor-inline-link {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}

.sponsor-band {
  min-height: 130px;
  padding: 28px clamp(36px, 7vw, 110px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  color: white;
  background: var(--blue);
}
.sponsor-band strong {
  text-transform: uppercase;
  font: 700 clamp(18px, 2vw, 30px)/1 var(--mono);
  letter-spacing: .12em;
}
.sponsor-band .sponsor-cta {
  justify-self: end;
  color: white;
  text-decoration: none;
  text-transform: uppercase;
  font: 700 11px/1 var(--mono);
  letter-spacing: .13em;
  border-bottom: 2px solid var(--yellow);
  padding-bottom: 8px;
}

.questions {
  padding: 100px clamp(36px, 7vw, 110px) 120px;
  display: grid;
  grid-template-columns: minmax(300px, .7fr) minmax(0, 1fr);
  gap: 90px;
}
.faq-list { border-top: 2px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--rule); }
.faq-list summary {
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  cursor: pointer;
  list-style: none;
  font: 700 16px/1.35 var(--sans);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary b { color: var(--blue); font: 400 22px/1 var(--mono); }
.faq-list details[open] summary b { transform: rotate(45deg); }
.faq-list details p {
  max-width: 62ch;
  margin: 0 0 25px;
  color: var(--muted);
  font: 15px/1.55 var(--sans);
}

.site-footer {
  padding: 60px clamp(36px, 7vw, 110px);
  display: grid;
  grid-template-columns: .6fr 1fr 1fr auto;
  gap: 40px;
  background: var(--ink);
  color: white;
}
.site-footer strong {
  text-transform: uppercase;
  font: 700 12px/1.4 var(--mono);
  letter-spacing: .12em;
}
.site-footer p { margin: 0; color: rgba(255,255,255,.68); font: 12px/1.5 var(--sans); }
.site-footer a {
  align-self: start;
  color: white;
  font: 10px/1 var(--mono);
  text-transform: uppercase;
}
.site-footer .sponsor-inline-link {
  color: inherit;
  font: inherit;
  text-transform: none;
}

@media (max-width: 1100px) {
  .site-shell { grid-template-columns: 78px minmax(0, 1fr); }
  .hero { grid-template-columns: minmax(0, 2fr) minmax(300px, 1fr); }
  .hero h1 { font-size: clamp(72px, 10vw, 112px); }
  .definition,
  .section-intro { grid-template-columns: 130px minmax(0, 1fr); }
  .definition > div,
  .section-intro > p:last-child { grid-column: 2; }
  .process-image,
  .process-list,
  .reference-table { margin-left: 180px; }
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .experience { grid-template-columns: .72fr 1.28fr; }
  .experience-item { grid-template-columns: 150px 1fr; }
}

@media (max-width: 760px) {
  .site-shell { display: block; }
  .chapter-nav {
    position: sticky;
    width: 100%;
    height: 58px;
    flex-direction: row;
    justify-content: space-between;
    padding: 0 18px;
  }
  .guide-mark { width: 30px; height: 30px; }
  .guide-mark { display: none; }
  .chapter-nav nav {
    width: 100%;
    flex: 1;
    min-width: 0;
    height: 100%;
    flex-direction: row;
    justify-content: space-between;
    gap: 8px;
    padding: 0;
    overflow-x: auto;
  }
  .chapter-nav nav a {
    writing-mode: initial;
    transform: none;
    white-space: nowrap;
    font-size: 8px;
  }
  .masthead {
    min-height: 66px;
    padding: 0 20px;
    grid-template-columns: 1fr auto;
  }
  .masthead p { display: none; }
  .sponsor-link { font-size: 9px; }
  .hero {
    min-height: 0;
    grid-template-columns: 1fr;
  }
  .hero-copy { padding: 42px 20px 30px; }
  .hero h1 { font-size: clamp(63px, 22vw, 104px); }
  .hero-definition { margin-top: 40px; }
  .field-note { margin-top: 36px; }
  .hero-plate {
    min-height: 430px;
    padding: 20px;
    border-top: 1px solid var(--rule);
    border-left: 0;
  }
  .hero-plate img { max-height: 390px; }
  .essentials { grid-template-columns: 1fr; }
  .essentials article { min-height: 0; }
  .essentials article + article { border-top: 1px solid var(--rule); border-left: 0; }
  .definition,
  .section-intro,
  .boise-note,
  .questions {
    display: block;
  }
  .definition,
  .process,
  .reference,
  .experience-copy,
  .boise-note,
  .questions { padding: 72px 20px; }
  .definition h2,
  .section-intro h2,
  .experience-copy > h2,
  .boise-note h2,
  .questions h2 { font-size: clamp(45px, 13vw, 66px); }
  .definition > div > p,
  .section-intro > p:last-child { margin-top: 28px; }
  .process-image {
    margin: 45px 0 0;
    display: block;
  }
  .process-image img {
    height: auto;
    object-fit: contain;
  }
  .process-image figcaption { margin-top: 14px; }
  .process-list {
    margin: 42px 0 0;
    grid-template-columns: 1fr;
  }
  .process-step,
  .process-step + .process-step {
    min-height: 0;
    padding: 22px 0;
    border-left: 0;
    border-bottom: 1px solid rgba(255,255,255,.5);
  }
  .experience { grid-template-columns: 1fr; }
  .experience > figure { border-right: 0; border-bottom: 1px solid var(--rule); }
  .experience > figure img { min-height: 0; }
  .experience-copy { padding-top: 72px; }
  .experience-item { grid-template-columns: 1fr; gap: 10px; }
  .reference-table { margin: 42px 0 0; }
  .reference-row {
    grid-template-columns: 1fr;
    padding: 17px 0;
  }
  .reference-row > * { padding: 7px 0; }
  .reference-row > * + * { padding-left: 0; border-left: 0; }
  .reference-header { display: none; }
  .boise-note aside { margin-top: 42px; }
  .sponsor-band {
    padding: 28px 20px;
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .sponsor-band .sponsor-cta { justify-self: start; }
  .faq-list { margin-top: 45px; }
  .site-footer {
    padding: 54px 20px;
    grid-template-columns: 1fr;
    gap: 24px;
  }
}