:root {
  --ink: #11263d;
  --ink-soft: #3d4f5f;
  --paper: #fbfaf7;
  --warm: #f1eee7;
  --line: #ccd2d3;
  --accent: #236b73;
  --accent-dark: #174d53;
  --white: #ffffff;
  --measure: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background: var(--paper);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  padding: 0.75rem 1rem;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-180%);
}

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

.site-header {
  width: min(var(--measure), calc(100% - 48px));
  margin: 0 auto;
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.wordmark-mark {
  width: 0.82rem;
  height: 0.82rem;
  display: block;
  background: var(--accent);
  box-shadow: 0.28rem 0.28rem 0 var(--ink);
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--ink-soft);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  color: var(--accent-dark);
}

main,
footer {
  width: min(var(--measure), calc(100% - 48px));
  margin-inline: auto;
}

.hero {
  min-height: calc(100vh - 78px);
  padding: clamp(4.5rem, 9vw, 8.5rem) 0 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(300px, 0.75fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
}

.eyebrow,
.section-label,
.card-kicker,
.memory-tag {
  margin: 0 0 1.1rem;
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  line-height: 1.3;
  text-transform: uppercase;
}

h1,
h2,
blockquote {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-weight: 500;
  letter-spacing: -0.035em;
}

h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(3rem, 6.5vw, 5.85rem);
  line-height: 0.99;
}

h1 span {
  color: var(--accent-dark);
}

.subtitle {
  max-width: 760px;
  margin: 2rem 0 0;
  color: var(--ink-soft);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
  line-height: 1.35;
}

.author-line {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.author-line a:first-child {
  color: var(--ink);
  font-weight: 700;
}

.actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.button,
.copy-button {
  min-height: 45px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover,
.button:focus-visible,
.copy-button:hover,
.copy-button:focus-visible {
  color: var(--white);
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
}

.button-primary {
  color: var(--white);
  background: var(--ink);
}

.button-text {
  border-color: transparent;
  text-decoration: underline;
}

.thesis-card {
  position: relative;
  padding: 1.7rem;
  border-top: 6px solid var(--accent);
  color: var(--ink);
  background: var(--warm);
  box-shadow: 12px 12px 0 #dbe2e0;
}

.card-question {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 1.65rem;
  line-height: 1.25;
}

.decision-list {
  margin-top: 1.6rem;
  border-top: 1px solid var(--line);
}

.decision-list div {
  padding: 0.9rem 0;
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.decision-list span {
  font-weight: 800;
}

.decision-list small {
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.5;
}

.decision-list .decision-active {
  color: var(--white);
  background: var(--accent-dark);
  margin-inline: -1rem;
  padding-inline: 1rem;
  border-bottom: 0;
}

.decision-list .decision-active small {
  color: #dbeae8;
}

.card-note {
  margin: 1.2rem 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.5;
}

.statement,
.framework,
.figure-section,
.loop-section,
.memory-section,
.agenda,
.abstract-section,
.citation-section {
  padding: clamp(5rem, 9vw, 8rem) 0;
  border-top: 1px solid var(--line);
}

.statement blockquote {
  max-width: 1020px;
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4.8rem);
  line-height: 1.08;
}

.statement-grid {
  max-width: 840px;
  margin: 3.5rem 0 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  color: var(--ink-soft);
}

.statement-grid p,
.section-heading p,
.figure-copy p,
.citation-section > div > p {
  margin: 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.7fr);
  gap: 4rem;
  align-items: end;
}

.section-heading.compact {
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(2.3rem, 4.5vw, 4.2rem);
  line-height: 1.05;
}

.section-heading > p,
.figure-copy > p:last-child,
.citation-section > div > p {
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.layers {
  margin-top: 4rem;
  border-top: 2px solid var(--ink);
}

.layer {
  padding: 2rem 0;
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr) 220px;
  gap: 2rem;
  align-items: start;
  border-bottom: 1px solid var(--line);
}

.layer-number {
  color: var(--accent);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 2.2rem;
  line-height: 1;
}

.layer h3,
.memory-grid h3 {
  margin: 0 0 0.55rem;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 1.55rem;
  line-height: 1.2;
}

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

.layer .layer-output {
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.figure-section {
  display: grid;
  grid-template-columns: minmax(260px, 0.55fr) minmax(0, 1.45fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
}

.figure-copy h2 {
  margin-bottom: 1.4rem;
}

.paper-figure {
  margin: 0;
  padding: 1.2rem;
  border: 1px solid var(--line);
  background: var(--white);
}

.paper-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.paper-figure figcaption {
  margin-top: 1rem;
  color: var(--ink-soft);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 0.9rem;
  line-height: 1.5;
}

.paper-figure-wide,
.hypothesis-figure {
  margin-top: 3.5rem;
}

.loop-section {
  position: relative;
}

.loop-section::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 calc(50% - 50vw);
  background: var(--warm);
}

.memory-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.5fr);
  gap: clamp(3rem, 7vw, 7rem);
}

.memory-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 2px solid var(--ink);
}

.memory-grid article {
  padding: 2rem;
  border-bottom: 1px solid var(--line);
}

.memory-grid article + article {
  border-left: 1px solid var(--line);
}

.memory-grid p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.hypotheses {
  margin: 3.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
  counter-reset: hypotheses;
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--line);
}

.hypotheses li {
  min-height: 190px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  counter-increment: hypotheses;
}

.hypotheses li::before {
  content: "H" counter(hypotheses);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.hypotheses strong {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 1.25rem;
  line-height: 1.2;
}

.hypotheses span {
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.55;
}

.abstract-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.4fr);
  gap: clamp(3rem, 7vw, 7rem);
}

.abstract-section h2 {
  font-size: clamp(2.2rem, 4vw, 3.8rem);
}

.abstract-copy {
  color: var(--ink-soft);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 1.18rem;
  line-height: 1.75;
}

.abstract-copy p:first-child {
  margin-top: 0;
}

.abstract-copy p:last-child {
  margin-bottom: 0;
}

.citation-section {
  display: grid;
  grid-template-columns: minmax(250px, 0.65fr) minmax(0, 1.35fr);
  gap: clamp(3rem, 7vw, 7rem);
}

.citation-card {
  border-top: 6px solid var(--accent);
  background: var(--ink);
  color: #eef4f3;
}

.citation-card pre {
  margin: 0;
  padding: 2rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.citation-card code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.82rem;
  line-height: 1.7;
}

.copy-button {
  margin: 0 2rem 2rem;
  color: var(--white);
  border-color: #80909a;
}

footer {
  padding: 2.5rem 0 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 2rem;
  align-items: center;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
}

footer p {
  margin: 0;
}

footer div {
  display: flex;
  gap: 1rem;
}

.footer-note {
  text-align: right;
}

.toast {
  position: fixed;
  z-index: 20;
  right: 1.5rem;
  bottom: 1.5rem;
  padding: 0.8rem 1rem;
  color: var(--white);
  background: var(--accent-dark);
  font-size: 0.86rem;
  font-weight: 700;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

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

:focus-visible {
  outline: 3px solid #e0a941;
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .site-header {
    min-height: 66px;
  }

  nav {
    display: none;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 4.5rem;
  }

  .thesis-card {
    max-width: 560px;
  }

  .section-heading,
  .figure-section,
  .memory-section,
  .abstract-section,
  .citation-section {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .statement-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .layer {
    grid-template-columns: 60px minmax(0, 1fr);
  }

  .layer-output {
    grid-column: 2;
  }

  .hypotheses {
    grid-template-columns: repeat(2, 1fr);
  }

  footer {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .footer-note {
    text-align: left;
  }
}

@media (max-width: 620px) {
  .site-header,
  main,
  footer {
    width: min(100% - 30px, var(--measure));
  }

  h1 {
    font-size: clamp(2.65rem, 14vw, 4rem);
  }

  .hero {
    padding-top: 3.5rem;
  }

  .button {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .button-text {
    width: auto;
    padding-inline: 0;
  }

  .statement,
  .framework,
  .figure-section,
  .loop-section,
  .memory-section,
  .agenda,
  .abstract-section,
  .citation-section {
    padding-block: 4.5rem;
  }

  .layer {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 1rem;
  }

  .memory-grid,
  .hypotheses {
    grid-template-columns: 1fr;
  }

  .memory-grid article + article {
    border-left: 0;
  }

  .paper-figure {
    padding: 0.7rem;
  }

  .hypothesis-figure,
  .paper-figure-wide {
    overflow-x: auto;
  }

  .hypothesis-figure img,
  .paper-figure-wide img {
    min-width: 760px;
  }

  .citation-card pre {
    padding: 1.2rem;
  }

  .copy-button {
    margin: 0 1.2rem 1.2rem;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}