:root {
  --bg: #ffffff;
  --bg-alt: #f6f8f5;
  --paper: #ffffff;
  --ink: #1f2328;
  --ink-soft: #424a53;
  --muted: #68717a;
  --line: #e2e6df;
  --line-strong: #ccd4ca;
  --green: #286a5a;
  --red: #b54d3b;
  --yellow: #d6a400;
  --cyan: #227f91;
  --soft-green: #e7f2eb;
  --soft-red: #f4e8e5;
  --soft-cyan: #e5f1f3;
  --shadow: none;
  --maxw: 1120px;
  --maxw-narrow: 840px;
  --radius: 8px;
  --transition: 160ms ease-out;
  color-scheme: light;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  color: #174f42;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: var(--radius);
  background: var(--ink);
  color: #ffffff;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.site-mark {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

.site-mark:hover {
  color: var(--ink);
  text-decoration: none;
}

.site-mark span:first-child {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--soft-green);
  color: #174f42;
  font-size: 13px;
}

.language-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #ffffff;
}

.language-switch__button {
  min-width: 48px;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
}

.language-switch__button:hover {
  color: var(--ink);
}

.language-switch__button.is-active {
  background: var(--ink);
  color: #ffffff;
}

.section,
.section-band {
  padding: 66px 24px;
}

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.section:first-child {
  border-top: 0;
}

.section-tinted {
  max-width: none;
  border-block: 1px solid var(--line);
  background: var(--bg-alt);
}

.section-tinted > * {
  max-width: var(--maxw);
  margin-inline: auto;
}

.hero {
  display: block;
  min-height: auto;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #f9fbf8 100%);
  text-align: center;
}

.hero-copy,
.hero-evidence,
.metric {
  min-width: 0;
}

.hero-copy-wide {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
}

.meta-line,
.authors {
  color: var(--muted);
}

.meta-line {
  margin-bottom: 16px;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.authors {
  max-width: 860px;
  margin: 0 auto 10px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.75;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  overflow-wrap: anywhere;
}

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

h1 {
  max-width: 980px;
  margin: 0 auto 18px;
  font-size: 46px;
  font-weight: 700;
  line-height: 1.12;
  overflow-wrap: anywhere;
  word-break: normal;
  text-wrap: balance;
}

h2 {
  max-width: 860px;
  margin-bottom: 1rem;
  font-family: "Noto Serif", Georgia, "Times New Roman", serif;
  font-size: 39px;
  font-weight: 700;
  line-height: 1.14;
  text-wrap: balance;
}

h3 {
  margin-bottom: 0.7rem;
  font-size: 1.1rem;
  line-height: 1.2;
}

.lead {
  max-width: 880px;
  margin: 24px auto 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.7;
  text-wrap: balance;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.resource-button {
  flex: 0 1 auto;
  min-height: 42px;
}

.button-prefix {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 22px;
  padding: 0 6px;
  border-radius: 5px;
  background: rgba(40, 106, 90, 0.12);
  color: #174f42;
  font-size: 10px;
  font-weight: 700;
}

.button.primary .button-prefix {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

.button:hover {
  border-color: var(--green);
  background: var(--soft-green);
  color: var(--ink);
  text-decoration: none;
  transform: translateY(-1px);
}

.button.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.button.primary:hover {
  border-color: #303741;
  background: #303741;
  color: #ffffff;
}

.button.compact {
  min-height: 40px;
  align-self: end;
  padding-inline: 0.9rem;
}

.hero-evidence {
  display: grid;
  gap: 1rem;
}

.metric,
.result-card,
.method-lane,
.boundary-grid article,
.gallery-card,
.quote-card,
.figure-anchor,
figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.metric {
  padding: 1.3rem;
}

.metric-value {
  display: block;
  color: var(--red);
  font-size: 2.6rem;
  font-weight: 850;
  line-height: 1;
}

.metric-label {
  display: block;
  margin-top: 0.6rem;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.section-heading {
  margin-bottom: 30px;
}

.section-heading p:not(.eyebrow) {
  max-width: 840px;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.7;
}

.two-column,
.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.two-column p {
  color: var(--ink-soft);
  font-size: 17px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.method-lane {
  padding: 24px;
}

.method-lane.emphasized {
  border-color: rgba(31, 122, 90, 0.42);
  background: var(--soft-green);
}

.flow-list {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-list li {
  position: relative;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.74);
}

.flow-list li + li::before {
  content: "";
  position: absolute;
  top: -0.72rem;
  left: 1.1rem;
  width: 2px;
  height: 0.72rem;
  background: var(--green);
}

.callout {
  margin: 1rem 0 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--yellow);
  background: #fff9df;
  color: #40361a;
}

.claim-note {
  margin: 1.5rem 0 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(181, 77, 59, 0.28);
  border-radius: 6px;
  background: var(--soft-red);
  color: #4e2c26;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.result-card {
  padding: 24px;
}

.evidence-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.evidence-strip div {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
}

.evidence-strip strong,
.evidence-strip span {
  display: block;
}

.evidence-strip strong {
  color: var(--red);
  font-size: 1.8rem;
  line-height: 1;
}

.evidence-strip span {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.tag {
  display: block;
  margin-bottom: 10px;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  text-transform: none;
}

.result-card p,
.boundary-grid p,
.gallery-card p,
.fine-print {
  color: var(--muted);
}

.figure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

figure {
  margin: 0;
  overflow: hidden;
}

figure img {
  width: 100%;
  background: #fff;
}

figcaption {
  padding: 0.8rem 1rem 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.featured-example {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.featured-copy {
  padding: 1.25rem;
}

.featured-copy p {
  color: var(--muted);
}

.featured-example img {
  width: 100%;
  border-left: 1px solid var(--line);
  background: #fff;
}

.gallery-controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr)) auto;
  gap: 0.8rem;
  align-items: end;
  margin-bottom: 0.8rem;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfcfb;
}

.gallery-controls label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
}

select {
  width: 100%;
  min-height: 40px;
  padding: 0 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.gallery-count {
  color: var(--muted);
  font-size: 0.94rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.gallery-card {
  overflow: hidden;
}

.gallery-card-body {
  padding: 1rem;
}

.card-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.8rem;
}

.pill {
  display: inline-flex;
  padding: 0.18rem 0.48rem;
  border-radius: 999px;
  background: var(--soft-red);
  color: var(--red);
  font-size: 0.75rem;
  font-weight: 800;
}

.pill.secondary {
  background: var(--soft-cyan);
  color: var(--cyan);
}

.case-text {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
}

.takeaway {
  color: var(--red);
  font-weight: 800;
}

.case-details {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0;
}

.case-details div {
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fafbf9;
}

.case-details dt {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.case-details dd {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.plain-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.boundary-grid article,
.quote-card {
  padding: 1.25rem;
}

.description-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 1rem;
}

.quote-card p {
  color: var(--muted);
  font-size: 1.05rem;
}

.figure-anchor-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.figure-anchor {
  overflow: hidden;
}

.figure-anchor img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.figure-anchor div {
  padding: 1rem;
}

.figure-anchor h3 {
  margin-bottom: 0.45rem;
}

.figure-anchor p {
  color: var(--muted);
}

.figure-anchor a {
  color: var(--green);
  font-weight: 800;
  text-decoration: none;
}

.bibtex {
  max-width: 760px;
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #141615;
  color: #eff8f1;
  font-size: 0.92rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 900px) {
  .two-column,
  .method-grid,
  .result-grid,
  .figure-grid,
  .evidence-strip,
  .featured-example,
  .description-grid,
  .figure-anchor-grid,
  .boundary-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(2.35rem, 8vw, 3rem);
    max-width: 100%;
  }

  h2 {
    font-size: 30px;
  }

  .gallery-controls {
    grid-template-columns: 1fr;
  }

  .featured-example img {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 560px) {
  .section,
  .section-band {
    padding: 42px 18px;
  }

  .container {
    padding: 0 18px;
  }

  .topbar {
    gap: 12px;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .site-mark {
    gap: 7px;
    font-size: 13px;
  }

  .site-mark span:first-child {
    width: 50px;
  }

  .language-switch__button {
    min-width: 42px;
  }

  .button-row {
    gap: 0.5rem;
    margin-top: 1.25rem;
    width: 100%;
  }

  .button {
    flex: 1 1 150px;
    min-height: 40px;
    padding: 0.58rem 0.68rem;
    font-size: 0.92rem;
  }

  .resource-button {
    min-height: 38px;
    max-width: 100%;
  }

  h1 {
    font-size: clamp(2rem, 9.6vw, 2.45rem);
    line-height: 1.15;
    text-wrap: wrap;
    word-break: break-word;
  }

  .meta-line {
    font-size: 12px;
    line-height: 1.45;
  }

  .lead {
    font-size: 16px;
    max-width: 100%;
  }
}