:root {
  --paper: #f4f1e8;
  --paper-deep: #ebe6da;
  --ink: #132238;
  --ink-soft: #4f5b68;
  --line: #b9b8b0;
  --blue: #2055a5;
  --blue-dark: #173e78;
  --blue-pale: #dbe7f7;
  --red: #b8442e;
  --green: #2d695d;
  --shadow: rgba(19, 34, 56, 0.12);
  --serif: Georgia, "Times New Roman", "Noto Serif SC", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(19, 34, 56, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 32px;
  font-family: var(--sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--paper);
  box-shadow: 0 0 0 6px var(--blue);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: white;
  background: var(--ink);
  transform: translateY(-150%);
}

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

.reading-progress {
  position: fixed;
  z-index: 90;
  inset: 0 0 auto;
  height: 4px;
  background: transparent;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--blue);
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  padding: 0 32px;
  border-bottom: 1px solid var(--ink);
  background: rgba(244, 241, 232, 0.95);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.masthead-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  width: max-content;
  text-decoration: none;
}

.masthead-brand span {
  color: var(--blue);
}

.masthead p {
  margin: 0;
  color: var(--ink-soft);
}

.masthead-exit {
  justify-self: end;
  text-underline-offset: 4px;
}

main,
.page-footer {
  width: min(1440px, 100%);
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(310px, 0.65fr);
  min-height: 640px;
  border-bottom: 1px solid var(--ink);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(64px, 9vw, 132px) clamp(32px, 7vw, 108px);
  border-right: 1px solid var(--ink);
}

.kicker,
.section-index,
.stage-nav > p,
.card-meta,
.evidence {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kicker,
.section-index {
  margin: 0 0 18px;
  color: var(--blue);
  font-weight: 700;
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(84px, 11vw, 172px);
  font-weight: 400;
  line-height: 0.88;
  letter-spacing: -0.07em;
}

.hero-deck {
  max-width: 760px;
  margin: 34px 0 0;
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 43px);
  line-height: 1.18;
}

.hero-intro {
  max-width: 780px;
  margin: 36px 0 0;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.5vw, 20px);
}

.hero-ledger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
  padding: 48px clamp(28px, 4vw, 64px);
  background: var(--paper-deep);
}

.hero-ledger > p {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  margin: 0;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.35;
}

.hero-ledger > p:first-child {
  border-top: 1px solid var(--line);
}

.hero-ledger > p span {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 12px;
}

.hero-ledger dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 56px 0 0;
}

.hero-ledger dl div {
  padding-right: 10px;
}

.hero-ledger dt {
  font-family: var(--serif);
  font-size: 42px;
  line-height: 1;
}

.hero-ledger dd {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.35;
  text-transform: uppercase;
}

.protocol,
.notes-section {
  display: grid;
  grid-template-columns: minmax(250px, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(32px, 8vw, 120px);
  padding: clamp(64px, 8vw, 112px) clamp(28px, 7vw, 104px);
  border-bottom: 1px solid var(--ink);
}

.protocol h2,
.section-head h2,
.answer-guide h2,
.notes-section h2,
.evidence-note h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(38px, 5vw, 72px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.protocol-body > p {
  max-width: 780px;
  margin: 0 0 22px;
  font-size: clamp(17px, 1.5vw, 21px);
}

.followup-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 42px;
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.followup-strip button {
  min-height: 78px;
  padding: 16px 18px;
  color: var(--ink);
  border: 0;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: transparent;
  font-family: var(--serif);
  font-size: 18px;
  text-align: left;
  cursor: pointer;
}

.followup-strip button:hover {
  color: white;
  background: var(--blue);
}

.stage-nav {
  position: sticky;
  z-index: 40;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 90px;
  padding: 12px 32px;
  color: white;
  background: var(--ink);
  box-shadow: 0 8px 20px var(--shadow);
}

.stage-nav > p {
  margin: 0;
  color: #bbc6d2;
}

.stage-buttons {
  display: flex;
  justify-content: center;
  gap: 6px;
}

.stage-buttons button {
  padding: 10px 13px;
  color: white;
  border: 1px solid #738092;
  border-radius: 999px;
  background: transparent;
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
}

.stage-buttons button[aria-pressed="true"],
.stage-buttons button:hover {
  color: var(--ink);
  border-color: var(--paper);
  background: var(--paper);
}

.filter-status {
  min-width: 130px;
  text-align: right;
}

.interview-section,
.answer-guide,
.evidence-note {
  padding: clamp(72px, 9vw, 132px) clamp(28px, 7vw, 104px);
  border-bottom: 1px solid var(--ink);
}

.interview-section[hidden] {
  display: none;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.55fr);
  column-gap: clamp(40px, 8vw, 120px);
  align-items: end;
  margin-bottom: 64px;
}

.section-head .section-index {
  grid-column: 1 / -1;
}

.section-head > p:last-child {
  max-width: 520px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
}

.question-list {
  border-top: 2px solid var(--ink);
}

.question-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(180px, 0.34fr) minmax(0, 1.2fr) minmax(230px, 0.58fr);
  gap: clamp(20px, 4vw, 58px);
  padding: 42px 0 46px;
  border-bottom: 1px solid var(--line);
}

.question-card.featured-question {
  margin: 0 -24px;
  padding-right: 24px;
  padding-left: 24px;
  background: var(--blue-pale);
}

.card-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 6px;
  font-weight: 700;
}

.evidence {
  width: fit-content;
  padding: 4px 7px;
  border: 1px solid currentColor;
  font-size: 9px;
  font-weight: 600;
}

.evidence.direct {
  color: var(--green);
}

.evidence.adapted {
  color: var(--blue);
}

.evidence.transfer {
  color: var(--red);
}

blockquote {
  margin: 0;
}

.question-card blockquote,
.offer-note blockquote,
.caution blockquote {
  font-family: var(--serif);
  font-size: clamp(24px, 2.45vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

blockquote p {
  margin: 0;
}

blockquote .follow-up {
  position: relative;
  margin-top: 22px;
  padding-left: 24px;
  color: var(--blue-dark);
  font-size: 0.76em;
}

blockquote .follow-up::before {
  position: absolute;
  top: 0;
  left: 0;
  content: "↳";
  color: var(--blue);
  font-family: var(--sans);
}

.question-card > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.copy-button {
  align-self: start;
  justify-self: start;
  grid-column: 2;
  margin-top: -20px;
  padding: 5px 0;
  color: var(--blue);
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.copy-button:hover {
  color: var(--red);
}

.offer-note {
  position: relative;
  display: grid;
  grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1fr);
  gap: 48px;
  margin: 0 0 72px;
  padding: 32px;
  color: white;
  background: var(--blue-dark);
}

.offer-note > p {
  margin: 0;
  color: #dce7f5;
}

.offer-note .copy-button {
  color: white;
}

.answer-guide {
  background: var(--paper-deep);
}

.answer-guide > .section-head {
  grid-template-columns: 1fr;
}

.answer-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.answer-columns article {
  min-height: 340px;
  padding: 34px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.answer-columns h3 {
  margin: 0 0 24px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
}

.answer-columns ul {
  margin: 0;
  padding-left: 20px;
}

.answer-columns li + li {
  margin-top: 12px;
}

.answer-columns .caution {
  color: white;
  background: var(--ink);
}

.caution > p {
  color: #ced6df;
}

.caution blockquote {
  margin-top: 26px;
  font-size: 20px;
}

.caution .copy-button {
  grid-column: auto;
  margin-top: 22px;
  color: #9fc2f4;
}

/* .caution is the one dark card in .answer-columns, so the follow-up line needs
   the same light blue the other children get; --blue-dark reads 1.5:1 here. */
.caution blockquote .follow-up,
.caution blockquote .follow-up::before {
  color: #9fc2f4;
}

.notes-section {
  align-items: center;
}

.notes-section > div > p:last-child {
  max-width: 480px;
  color: var(--ink-soft);
}

.notes-section pre {
  overflow-x: auto;
  margin: 0;
  padding: 36px;
  color: #e8edf4;
  background: var(--ink);
  box-shadow: 12px 12px 0 var(--blue-pale);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
}

.evidence-note {
  color: white;
  background: var(--blue-dark);
}

.evidence-note .section-index {
  color: #adcaf3;
}

.evidence-note > p:not(.section-index) {
  max-width: 900px;
  margin: 28px 0 0;
  color: #dbe5f1;
  font-size: 17px;
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 58px;
  border-top: 1px solid #7086a4;
  border-left: 1px solid #7086a4;
}

.source-list a {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  padding: 20px;
  border-right: 1px solid #7086a4;
  border-bottom: 1px solid #7086a4;
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
}

.source-list a:hover {
  color: var(--ink);
  background: var(--paper);
}

.source-list span {
  color: #adcaf3;
}

.source-list a:hover span {
  color: var(--blue);
}

.page-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 140px;
  padding: 32px clamp(28px, 7vw, 104px);
  color: white;
  background: var(--ink);
}

.page-footer p {
  display: flex;
  flex-direction: column;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-footer span {
  margin-top: 8px;
  color: #9cabbc;
}

.page-footer a {
  font-family: var(--mono);
  font-size: 11px;
  text-underline-offset: 5px;
}

.copy-status {
  position: fixed;
  z-index: 95;
  right: 20px;
  bottom: 20px;
  max-width: calc(100vw - 40px);
  padding: 11px 16px;
  color: white;
  background: var(--blue-dark);
  box-shadow: 4px 4px 0 rgba(19, 34, 56, 0.2);
  font-family: var(--mono);
  font-size: 11px;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.copy-status.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .masthead {
    grid-template-columns: 1fr auto;
    padding: 0 20px;
  }

  .masthead > p,
  .masthead-brand b {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    min-height: 560px;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .hero-ledger {
    min-height: 420px;
  }

  .stage-nav {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 12px 20px 16px;
  }

  .stage-nav > p:first-child {
    display: none;
  }

  .stage-buttons {
    justify-content: flex-start;
    overflow-x: auto;
    padding: 4px 3px 8px;
    scrollbar-width: thin;
  }

  .stage-buttons button {
    flex: 0 0 auto;
  }

  .filter-status {
    text-align: left;
  }

  .question-card {
    grid-template-columns: minmax(150px, 0.32fr) minmax(0, 1fr);
  }

  .question-card > p {
    grid-column: 2;
  }

  .answer-columns {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 116px;
  }

  body {
    background-size: 100% 28px;
  }

  .masthead {
    min-height: 58px;
  }

  .hero-copy {
    min-height: 500px;
    padding: 72px 24px;
  }

  .hero h1 {
    font-size: clamp(70px, 24vw, 110px);
  }

  .hero-deck {
    font-size: 27px;
  }

  .hero-intro {
    margin-top: 28px;
    font-size: 16px;
  }

  .hero-ledger {
    min-height: auto;
    padding: 44px 24px;
  }

  .hero-ledger dl {
    margin-top: 38px;
  }

  .hero-ledger dt {
    font-size: 34px;
  }

  .protocol,
  .notes-section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 64px 24px;
  }

  .protocol h2,
  .section-head h2,
  .answer-guide h2,
  .notes-section h2,
  .evidence-note h2 {
    font-size: 43px;
  }

  .followup-strip {
    grid-template-columns: 1fr;
  }

  .stage-nav {
    position: sticky;
    min-height: 86px;
  }

  .interview-section,
  .answer-guide,
  .evidence-note {
    padding: 68px 24px;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 46px;
  }

  .question-card {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 34px 0 38px;
  }

  .question-card.featured-question {
    margin: 0 -12px;
    padding-right: 12px;
    padding-left: 12px;
  }

  .card-meta {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .question-card blockquote,
  .offer-note blockquote {
    font-size: 28px;
  }

  .question-card > p,
  .copy-button {
    grid-column: 1;
  }

  .copy-button {
    margin-top: -12px;
  }

  .offer-note {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 54px;
    padding: 26px 22px 34px;
  }

  .answer-columns article {
    min-height: auto;
    padding: 28px 24px;
  }

  .notes-section pre {
    margin-right: 8px;
    padding: 24px;
    font-size: 11px;
    box-shadow: 8px 8px 0 var(--blue-pale);
  }

  .source-list {
    grid-template-columns: 1fr;
  }

  .page-footer {
    min-height: 120px;
    padding: 26px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .copy-status {
    transition: none;
  }
}