:root {
  --paper: #f4f1e9;
  --paper-bright: #fbfaf6;
  --ink: #12233f;
  --ink-soft: #445066;
  --line: #d5d5ce;
  --line-dark: #aeb5ae;
  --green: #153f36;
  --green-soft: #dce7dd;
  --blue: #3158ad;
  --blue-soft: #dce6fa;
  --ochre: #9a6b18;
  --slate-soft: #e1e5eb;
  --red: #a5443f;
  --sans: "Avenir Next", Avenir, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --max: 1240px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent calc(100% - 1px), rgba(21, 63, 54, 0.05) 1px) 0 0 / 64px 64px,
    var(--paper);
  font-family: var(--sans);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 3px solid #e9ad3d;
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: white;
  background: var(--green);
  transform: translateY(-200%);
}

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

.site-header {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  max-width: var(--max);
  min-height: 82px;
  margin: 0 auto;
  padding: 0 2rem;
  border-bottom: 1px solid var(--line-dark);
}

.wordmark {
  display: inline-flex;
  gap: 0.7rem;
  align-items: center;
  justify-self: start;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.wordmark-mark,
.footer-mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  aspect-ratio: 1;
  color: var(--paper-bright);
  background: var(--green);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0;
}

.site-header nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header nav a,
.header-link {
  text-decoration: none;
}

.site-header nav a:hover,
.header-link:hover,
.footer-links a:hover {
  color: var(--blue);
}

.header-link {
  justify-self: end;
  font-size: 0.82rem;
  font-weight: 700;
}

.hero {
  display: grid;
  grid-template-columns: 1.03fr 0.97fr;
  gap: clamp(2.5rem, 6vw, 6.5rem);
  align-items: center;
  max-width: var(--max);
  min-height: calc(100svh - 82px);
  margin: 0 auto;
  padding: clamp(4.5rem, 8vw, 8rem) 2rem;
}

.hero-copy {
  max-width: 680px;
}

.eyebrow,
.proof-label {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1.5rem;
  color: var(--green);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow span:first-child::before {
  display: inline-block;
  width: 2.5rem;
  height: 2px;
  margin: 0 0.7rem 0.25rem 0;
  background: var(--green);
  content: "";
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 1.6rem;
  font-family: var(--serif);
  font-size: clamp(3.25rem, 5.7vw, 6.8rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.94;
}

.title-acronym {
  display: block;
  color: var(--green);
  font-family: var(--sans);
  font-size: 0.23em;
  font-weight: 800;
  letter-spacing: 0.18em;
  line-height: 1;
  text-transform: uppercase;
}

.hero-deck {
  max-width: 610px;
  margin-bottom: 1.75rem;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(1.1rem, 1.6vw, 1.38rem);
  line-height: 1.55;
}

.hero-deck em {
  color: var(--ink);
  font-style: italic;
}

.authors {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  margin-bottom: 0.15rem;
  font-weight: 750;
}

.affiliation {
  margin-bottom: 2rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.button {
  display: inline-flex;
  gap: 0.65rem;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.7rem 1.05rem;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.32);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.045em;
  text-decoration: none;
  transition: transform 160ms ease, color 160ms ease, background 160ms ease;
}

.button:hover {
  color: var(--paper-bright);
  background: var(--ink);
  transform: translateY(-2px);
}

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

.button-text {
  border-color: transparent;
  background: transparent;
}

.hero-proof {
  position: relative;
  padding: 1rem;
  background: var(--paper-bright);
  border: 1px solid var(--line-dark);
  box-shadow: 16px 16px 0 var(--green-soft);
}

.hero-proof::before {
  position: absolute;
  inset: -12px 18px auto -12px;
  height: 1px;
  background: var(--green);
  content: "";
}

.hero-proof img {
  width: 100%;
  min-height: 240px;
  object-fit: contain;
  background: #fff;
  border: 1px solid #e3e3de;
}

.hero-proof > p {
  max-width: 36rem;
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.proof-index {
  color: var(--ink-soft);
}

.thesis-band {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  align-items: center;
  padding: clamp(2rem, 4vw, 4rem) max(2rem, calc((100vw - var(--max)) / 2 + 2rem));
  color: white;
  background: var(--green);
}

.thesis-band p {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.5vw, 2.5rem);
  line-height: 1.2;
}

.thesis-band span {
  color: #a8c8b8;
  font-size: 2rem;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(6rem, 10vw, 10rem) 2rem;
  scroll-margin-top: 2rem;
}

.section-heading {
  display: grid;
  grid-template-columns: 0.3fr 1.05fr 0.65fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
  margin-bottom: clamp(3rem, 6vw, 6rem);
}

.section-number,
.card-kicker,
.flow-label,
.prob-step {
  color: var(--green);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.section-heading h2 {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(2.65rem, 5vw, 5.3rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.section-heading > p:last-child {
  color: var(--ink-soft);
  font-size: 1rem;
}

.failure-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.failure-card {
  display: flex;
  min-height: 390px;
  padding: 2rem;
  border-right: 1px solid var(--line-dark);
  flex-direction: column;
}

.failure-card:last-child {
  border-right: 0;
}

.failure-code {
  display: flex;
  min-height: 92px;
  margin-bottom: 2rem;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.42);
  border: 1px solid var(--line);
}

.token {
  padding: 0.4rem 0.55rem;
  background: white;
  border: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
}

.token-bad {
  color: var(--red);
  border-color: rgba(165, 68, 63, 0.45);
  text-decoration: line-through;
}

.failure-card h3,
.constraint-list h3,
.flow-input h3,
.result-card h3,
.plan h3,
.demo-card h3 {
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.15;
}

.failure-card > p:not(.card-kicker) {
  color: var(--ink-soft);
}

.failure-tag {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 1rem;
  color: var(--red);
  border-top: 1px solid rgba(165, 68, 63, 0.3);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-method {
  max-width: none;
  padding-right: max(2rem, calc((100vw - var(--max)) / 2 + 2rem));
  padding-left: max(2rem, calc((100vw - var(--max)) / 2 + 2rem));
  background: var(--ink);
}

.section-method,
.section-method .section-number,
.section-method .card-kicker,
.section-method .flow-label {
  color: #f3f0e6;
}

.section-method .section-heading > p:last-child,
.section-method .flow-input > p:last-child,
.section-method .constraint-list p,
.scope-note {
  color: #b9c0cc;
}

.method-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 1.5rem;
  align-items: stretch;
  margin-bottom: 4rem;
}

.flow-input {
  min-height: 260px;
  padding: 1.75rem;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.flow-input h3 {
  color: white;
  font-size: 1.7rem;
}

.flow-output {
  background: var(--green);
  border-color: #739789;
}

.flow-step {
  float: right;
  color: #778198;
  font-family: var(--serif);
  font-size: 2rem;
}

.flow-arrow {
  display: grid;
  place-items: center;
  color: #6d7892;
}

.constraint-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.constraint-list article {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  padding: 2.25rem 2rem 2.25rem 0;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.constraint-list article + article {
  padding-left: 2rem;
}

.constraint-list article:last-child {
  border-right: 0;
}

.constraint-symbol {
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.8rem;
  color: var(--ink);
  background: #c8d9cf;
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
}

.constraint-list h3 {
  color: white;
}

.scope-note {
  max-width: 820px;
  margin: 3rem 0 0 auto;
  padding-left: 1.25rem;
  border-left: 3px solid #76a090;
  font-size: 0.9rem;
}

.scope-note strong {
  color: white;
}

.result-feature {
  display: grid;
  grid-template-columns: 0.42fr 0.58fr;
  gap: clamp(2rem, 6vw, 6rem);
  padding: clamp(2rem, 4vw, 4rem);
  background: var(--paper-bright);
  border: 1px solid var(--line-dark);
}

.result-number {
  margin: 1.2rem 0 0;
  color: var(--blue);
  font-family: var(--serif);
  font-size: clamp(4.5rem, 8vw, 8rem);
  font-weight: 600;
  letter-spacing: -0.08em;
  line-height: 0.85;
}

.result-lead h3 {
  margin: 0 0 1.5rem;
  font-family: var(--serif);
  font-size: 1.7rem;
}

.result-lead > p:last-child,
.result-card > p:last-child {
  color: var(--ink-soft);
}

.result-chart {
  align-self: center;
}

.chart-row {
  display: grid;
  grid-template-columns: 9rem 1fr 3rem;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.35rem;
  font-size: 0.76rem;
}

.chart-row strong {
  font-size: 0.95rem;
  text-align: right;
}

.bar-track {
  height: 9px;
  overflow: hidden;
  background: #e7e4db;
}

.bar {
  display: block;
  width: calc(var(--value) * 2.25);
  height: 100%;
  background: #8e96a5;
}

.bar.hard { background: #6f8a80; }
.bar.hmm { background: #6282c7; }
.bar.clamp { background: var(--blue); }

.chart-row-emphasis {
  padding: 0.75rem;
  background: var(--blue-soft);
}

.chart-note {
  margin: 2rem 0 0;
  padding-top: 1rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  font-size: 0.72rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.result-card {
  min-height: 340px;
  padding: 2rem;
  border: 1px solid var(--line-dark);
}

.result-card-blue { background: var(--blue-soft); }
.result-card-green { background: var(--green-soft); }
.result-card-ochre { background: #eee4ce; }
.result-card-slate { background: var(--slate-soft); }

.before-after {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: end;
  margin: 2.5rem 0;
}

.before-after > div {
  display: flex;
  flex-direction: column;
}

.before-after span {
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.before-after strong {
  font-family: var(--serif);
  font-size: 2.8rem;
  line-height: 1;
}

.diagnostic-pair {
  display: grid;
  gap: 0.8rem;
  margin: 2rem 0;
}

.diagnostic-pair > div {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.9rem 0;
  border-top: 1px solid rgba(18, 35, 63, 0.2);
}

.diagnostic-pair > div:last-child {
  border-bottom: 1px solid rgba(18, 35, 63, 0.2);
}

.diagnostic-pair span {
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.diagnostic-pair strong {
  flex: 0 0 auto;
  font-family: var(--serif);
  font-size: 1.45rem;
  line-height: 1;
}

.cases-heading {
  margin-bottom: 4rem;
}

.case-feature {
  background: var(--paper-bright);
  border: 1px solid var(--line-dark);
}

.case-context {
  display: grid;
  grid-template-columns: 0.48fr 0.52fr;
  border-bottom: 1px solid var(--line-dark);
}

.case-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line-dark);
}

figure {
  margin: 0;
}

.case-images figure {
  position: relative;
  background: white;
}

.case-images img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.case-images figcaption {
  position: absolute;
  right: 0.7rem;
  bottom: 0.7rem;
  padding: 0.35rem 0.5rem;
  color: white;
  background: rgba(18, 35, 63, 0.85);
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.case-prompt {
  display: flex;
  padding: clamp(2rem, 4vw, 4rem);
  justify-content: center;
  flex-direction: column;
}

.case-prompt > span {
  color: var(--blue);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.case-prompt blockquote {
  margin: 1rem 0 2rem;
  font-family: var(--serif);
  font-size: clamp(1.7rem, 2.6vw, 2.8rem);
  line-height: 1.2;
}

.case-prompt p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.plan-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line-dark);
}

.plan {
  padding: clamp(2rem, 4vw, 3.5rem);
}

.plan:first-child {
  border-right: 1px solid var(--line-dark);
}

.plan-baseline {
  background: #f3e4e1;
}

.plan-clamp {
  background: var(--green-soft);
}

.plan > code {
  display: block;
  min-height: 76px;
  padding: 1.1rem;
  overflow-wrap: anywhere;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(18, 35, 63, 0.15);
  font-size: 0.78rem;
}

.plan-metrics {
  display: flex;
  gap: 1.2rem;
  margin-top: 1.5rem;
  color: var(--ink-soft);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.plan-metrics strong {
  color: var(--ink);
}

.probability-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line-dark);
}

.probability-strip article {
  min-height: 230px;
  padding: 1.75rem;
  border-right: 1px solid var(--line-dark);
}

.probability-strip article:last-child {
  border-right: 0;
}

.probability-strip h4 {
  margin: 0.7rem 0 1.3rem;
  font-family: var(--serif);
  font-size: 1.25rem;
}

.probability-strip article > p:last-child {
  color: var(--ink-soft);
  font-size: 0.74rem;
}

.prob-pair {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.prob-pair > span {
  display: flex;
  flex: 1;
  padding: 0.55rem;
  background: #e8e6df;
  flex-direction: column;
  font-size: 0.62rem;
  text-transform: uppercase;
}

.prob-pair > span:last-child {
  color: white;
  background: var(--blue);
}

.case-download {
  display: flex;
  gap: 2rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
}

.case-download p {
  max-width: 860px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.case-download a {
  flex: 0 0 auto;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 800;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.demo-card {
  display: grid;
  grid-template-columns: minmax(150px, 0.45fr) 0.55fr;
  column-gap: 1.6rem;
  align-items: center;
  padding: 1.25rem;
  border: 1px solid var(--line-dark);
}

.demo-image-wrap {
  grid-row: 1 / span 3;
}

.demo-image-wrap img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.demo-card .card-kicker,
.demo-card h3,
.demo-card > p:last-child {
  grid-column: 2;
}

.demo-card > p:last-child {
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.section-dataset {
  max-width: none;
  padding: 0;
}

.dataset-panel {
  padding: clamp(5rem, 8vw, 8rem) max(2rem, calc((100vw - var(--max)) / 2 + 2rem));
  color: white;
  background: var(--green);
}

.dataset-heading {
  grid-template-columns: 0.3fr 1fr 0.7fr;
}

.dataset-heading .section-number,
.dataset-heading > p:last-of-type {
  color: #c2d0c9;
}

.button-light {
  align-self: start;
  justify-self: start;
  color: var(--green);
  background: white;
  border-color: white;
}

.dataset-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.35);
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
}

.dataset-stats div {
  padding: 2.5rem 2rem;
  border-right: 1px solid rgba(255, 255, 255, 0.35);
}

.dataset-stats div:last-child {
  border-right: 0;
}

.dataset-stats dt {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 4vw, 4.5rem);
  font-weight: 600;
  line-height: 1;
}

.dataset-stats dd {
  margin: 0.8rem 0 0;
  color: #c2d0c9;
  font-size: 0.78rem;
}

.artifact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 2rem;
}

.artifact-line span {
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 999px;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
}

.citation-heading {
  margin-bottom: 3rem;
}

.citation-card {
  position: relative;
  padding: clamp(1.5rem, 3vw, 3rem);
  color: #eef1f6;
  background: var(--ink);
}

.citation-card pre {
  margin: 0;
  overflow-x: auto;
  font-size: clamp(0.7rem, 1.2vw, 0.86rem);
  line-height: 1.8;
  white-space: pre-wrap;
}

.citation-actions {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  gap: 0.65rem;
  align-items: center;
}

.copy-button,
.citation-actions a {
  min-height: 40px;
  padding: 0.55rem 0.8rem;
  color: white;
  background: transparent;
  border: 1px solid #7c869b;
  font: 750 0.7rem var(--sans);
  letter-spacing: 0.06em;
  line-height: 1.65;
  text-decoration: none;
  text-transform: uppercase;
}

.copy-button {
  cursor: pointer;
}

.copy-button:hover,
.citation-actions a:hover {
  color: var(--ink);
  background: white;
}

.copy-status {
  min-height: 1.5em;
  margin: 1rem 0 0;
  color: #bfc9d7;
  font-size: 0.7rem;
}

footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 2rem;
  border-top: 1px solid var(--line-dark);
}

footer > div:first-child {
  display: flex;
  gap: 1rem;
  align-items: center;
}

footer strong {
  letter-spacing: 0.1em;
}

footer p {
  margin: 0.15rem 0 0;
  color: var(--ink-soft);
  font-size: 0.72rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.footer-note {
  grid-column: 1 / -1;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .hero,
  .section-heading,
  .dataset-heading {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-proof {
    max-width: 760px;
  }

  .section-heading {
    gap: 1rem;
  }

  .section-heading h2 {
    max-width: 780px;
  }

  .section-heading > p:last-child {
    max-width: 620px;
  }

  .failure-grid,
  .constraint-list,
  .result-grid,
  .probability-strip,
  .dataset-stats {
    grid-template-columns: 1fr 1fr;
  }

  .failure-card:nth-child(2),
  .constraint-list article:nth-child(2),
  .probability-strip article:nth-child(2),
  .dataset-stats div:nth-child(2) {
    border-right: 0;
  }

  .failure-card:last-child,
  .constraint-list article:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid var(--line-dark);
  }

  .constraint-list article:last-child,
  .constraint-list article:nth-child(2) {
    border-right: 0;
  }

  .method-flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .result-feature,
  .case-context {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    min-height: 68px;
    padding: 0 1.1rem;
  }

  .header-link {
    font-size: 0.72rem;
  }

  .hero,
  .section {
    padding-right: 1.1rem;
    padding-left: 1.1rem;
  }

  .hero {
    gap: 3rem;
    padding-top: 4rem;
    padding-bottom: 5rem;
  }

  .eyebrow {
    flex-direction: column;
  }

  .hero-actions .button {
    flex: 1 1 calc(50% - 0.65rem);
  }

  .hero-proof {
    box-shadow: 8px 8px 0 var(--green-soft);
  }

  .thesis-band {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 2.5rem 1.1rem;
  }

  .thesis-band span {
    transform: rotate(90deg);
    transform-origin: left center;
  }

  .failure-grid,
  .constraint-list,
  .result-grid,
  .probability-strip,
  .dataset-stats,
  .plan-comparison {
    grid-template-columns: 1fr;
  }

  .failure-card,
  .constraint-list article,
  .constraint-list article + article,
  .result-card,
  .probability-strip article,
  .dataset-stats div {
    grid-column: auto;
    padding: 1.5rem;
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .constraint-list article,
  .constraint-list article + article {
    border-bottom-color: rgba(255, 255, 255, 0.2);
  }

  .failure-card:last-child,
  .constraint-list article:last-child,
  .result-card:last-child,
  .probability-strip article:last-child,
  .dataset-stats div:last-child {
    border-bottom: 0;
  }

  .section-method,
  .dataset-panel {
    padding-right: 1.1rem;
    padding-left: 1.1rem;
  }

  .result-feature,
  .case-prompt,
  .plan {
    padding: 1.5rem;
  }

  .chart-row {
    grid-template-columns: 1fr 2.5rem;
    gap: 0.45rem;
  }

  .chart-row .bar-track {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .chart-row strong {
    grid-column: 2;
    grid-row: 1;
  }

  .case-images {
    grid-template-columns: 1fr 1fr;
  }

  .plan:first-child {
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .case-download {
    align-items: flex-start;
    flex-direction: column;
  }

  .demo-card {
    grid-template-columns: 1fr;
  }

  .demo-image-wrap,
  .demo-card .card-kicker,
  .demo-card h3,
  .demo-card > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }

  .demo-image-wrap {
    margin-bottom: 1rem;
  }

  .citation-actions {
    position: static;
    margin-top: 1rem;
    flex-wrap: wrap;
  }

  footer {
    grid-template-columns: 1fr;
    padding: 2.5rem 1.1rem;
  }

  .footer-links {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
  }
}

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

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