:root {
  --ink: #15212b;
  --muted: #62727d;
  --line: #dce4e7;
  --paper: #f7f8f5;
  --white: #ffffff;
  --green: #3b806e;
  --green-soft: #dfeee8;
  --blue: #5f8ca2;
  --orange: #c88852;
  --dark: #18252d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
.shell { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 34px;
  height: 72px;
  padding: 0 max(24px, calc((100vw - 1160px) / 2));
  border-bottom: 1px solid rgba(220, 228, 231, .9);
  background: rgba(247, 248, 245, .94);
  backdrop-filter: blur(12px);
}
.brand { margin-right: auto; font-size: 20px; font-weight: 800; letter-spacing: .01em; }
.brand span, h1 span { color: var(--green); }
.topbar nav { display: flex; gap: 26px; color: var(--muted); font-size: 14px; }
.topbar nav a:hover, .footer a:hover { color: var(--green); }
.nav-button {
  padding: 8px 13px;
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 700;
}

.hero { display: grid; grid-template-columns: .88fr 1.12fr; gap: 72px; align-items: center; padding-top: 92px; padding-bottom: 108px; }
.eyebrow, .section-kicker {
  margin: 0 0 17px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1 { margin: 0; font-size: clamp(64px, 9vw, 116px); line-height: .92; letter-spacing: -.06em; }
.lede { max-width: 520px; margin: 30px 0 25px; font-size: clamp(22px, 2.4vw, 31px); line-height: 1.2; letter-spacing: -.025em; }
.authors { margin: 0; font-size: 14px; }
.affiliations, .note { color: var(--muted); font-size: 12px; line-height: 1.55; }
.actions { display: flex; gap: 10px; margin-top: 29px; }
.button { display: inline-flex; align-items: center; gap: 9px; padding: 12px 17px; border: 1px solid var(--ink); font-size: 13px; font-weight: 750; }
.button-dark { color: #fff; background: var(--ink); }
.button-light { background: transparent; }
.button:hover { transform: translateY(-2px); }
.hero-visual { padding: 18px; border: 1px solid var(--line); background: var(--white); box-shadow: 14px 14px 0 var(--green-soft); }
.visual-label { margin: 0 0 13px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.hero-visual img { width: 100%; aspect-ratio: 1.5; object-fit: contain; background: #f2f4f1; }
.visual-caption, figcaption { margin-top: 12px; color: var(--muted); font-size: 12px; line-height: 1.5; }

.statement-band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--green-soft); }
.statement-grid { display: grid; grid-template-columns: .45fr 1fr 1.05fr; gap: 34px; align-items: start; padding: 56px 0; }
.statement-grid h2 { margin: 0; font-size: clamp(28px, 4vw, 48px); line-height: 1.05; letter-spacing: -.045em; }
.statement-grid > p:last-child { margin: 2px 0 0; color: #426156; font-size: 15px; }
em { color: var(--green); font-style: normal; }

.section { padding-top: 112px; padding-bottom: 112px; }
.section-heading { max-width: 720px; }
h2 { margin: 0 0 18px; font-size: clamp(34px, 5vw, 62px); line-height: 1.02; letter-spacing: -.05em; }
.section-heading > p:last-child { max-width: 650px; margin: 0; color: var(--muted); font-size: 16px; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 58px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.method-step { min-height: 220px; padding: 24px 28px 25px 0; border-right: 1px solid var(--line); }
.method-step + .method-step { padding-left: 28px; }
.method-step:last-child { border-right: 0; }
.step-number { display: block; margin-bottom: 35px; color: var(--green); font-size: 12px; font-weight: 800; }
h3 { margin: 0 0 10px; font-size: 21px; letter-spacing: -.02em; }
.method-step p { margin: 0; color: var(--muted); font-size: 14px; }
.wide-figure { margin: 64px 0 0; }
.wide-figure img { width: 100%; border: 1px solid var(--line); background: #fff; }

.section-tint { background: #eaf0ee; }
.two-column { display: grid; grid-template-columns: .82fr 1.18fr; gap: 90px; align-items: center; }
.two-column > div:first-child > p:not(.section-kicker) { max-width: 500px; color: var(--muted); font-size: 15px; }
.signal-list { margin-top: 34px; border-top: 1px solid #c8d9d3; }
.signal-list div { display: flex; align-items: center; gap: 11px; padding: 12px 0; border-bottom: 1px solid #c8d9d3; color: var(--muted); font-size: 13px; }
.signal-list strong { min-width: 77px; color: var(--ink); }
.signal-dot { width: 9px; height: 9px; border-radius: 50%; }
.green { background: var(--green); } .blue { background: var(--blue); } .orange { background: var(--orange); }
.image-stack { position: relative; min-height: 490px; }
.image-stack figure { width: 78%; margin: 0; padding: 12px; background: var(--white); box-shadow: 8px 8px 0 rgba(95, 140, 162, .17); }
.image-stack figure img { width: 100%; aspect-ratio: 1.35; object-fit: cover; }
.image-stack .offset-figure { position: absolute; right: 0; bottom: 0; box-shadow: -8px 8px 0 rgba(200, 136, 82, .18); }

.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 54px; }
.metric { min-height: 166px; padding: 23px 18px; background: var(--white); border-top: 3px solid var(--green); }
.metric:nth-child(2) { border-color: var(--blue); } .metric:nth-child(3) { border-color: var(--orange); } .metric:nth-child(4) { border-color: var(--ink); }
.metric-value { display: block; font-size: 34px; font-weight: 800; letter-spacing: -.05em; }
.metric-label { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; line-height: 1.35; }
.metric-change { display: block; margin-top: 15px; color: var(--green); font-size: 12px; font-weight: 750; }
.robot-figure { margin-top: 55px; }

.section-dark { color: #f4f7f4; background: var(--dark); }
.section-dark .section-kicker { color: #9bd0bd; }
.deployment { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: end; }
.deployment h2 { max-width: 480px; }
.deployment-points { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.deployment-points p { margin: 0; padding-top: 16px; border-top: 1px solid #53636a; color: #a9b7bb; font-size: 13px; }
.deployment-points strong { color: #fff; font-size: 15px; }

.citation-section { padding-bottom: 90px; }
.resource-row { display: flex; gap: 12px; margin-top: 38px; }
.resource { display: flex; justify-content: space-between; gap: 70px; padding: 14px 17px; border: 1px solid var(--ink); font-size: 13px; font-weight: 750; }
.resource:hover { color: var(--green); border-color: var(--green); }
.bibtex { margin-top: 42px; overflow: hidden; border: 1px solid var(--line); background: #edf0ee; }
.bibtex-header { display: flex; justify-content: space-between; padding: 10px 15px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.bibtex button { padding: 0; border: 0; color: var(--green); background: transparent; font: inherit; cursor: pointer; text-transform: uppercase; }
pre { overflow-x: auto; margin: 0; padding: 20px; color: #3b4b53; font: 12px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.footer { border-top: 1px solid var(--line); }
.footer-inner { display: flex; align-items: center; gap: 18px; min-height: 88px; color: var(--muted); font-size: 12px; }
.footer img { width: 90px; height: auto; object-fit: contain; }
.footer a { margin-left: auto; }

@media (max-width: 850px) {
  .topbar { gap: 16px; padding: 0 24px; }
  .topbar nav { display: none; }
  .hero, .two-column, .deployment, .statement-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero { padding-top: 64px; padding-bottom: 80px; }
  .hero-visual { box-shadow: 8px 8px 0 var(--green-soft); }
  .statement-grid { padding: 42px 0; }
  .statement-grid h2 { max-width: 620px; }
  .method-grid, .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .method-step:nth-child(2) { border-right: 0; }
  .method-step:nth-child(3) { border-top: 1px solid var(--line); padding-left: 0; }
  .image-stack { min-height: 440px; }
  .deployment-points { gap: 15px; }
}
@media (max-width: 560px) {
  .shell { width: min(100% - 32px, 1160px); }
  .topbar { height: 62px; padding: 0 16px; }
  .nav-button { padding: 7px 10px; }
  .hero { padding-top: 54px; }
  h1 { font-size: 72px; }
  .lede { font-size: 24px; }
  .actions, .resource-row { flex-wrap: wrap; }
  .button, .resource { width: 100%; justify-content: center; }
  .section { padding-top: 75px; padding-bottom: 75px; }
  .method-grid, .metric-grid { grid-template-columns: 1fr; }
  .method-step, .method-step + .method-step { padding: 22px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .method-step:last-child { border-bottom: 0; }
  .method-step:nth-child(3) { border-top: 0; }
  .image-stack { min-height: 350px; }
  .image-stack figure { width: 87%; }
  .image-stack .offset-figure { width: 72%; }
  .deployment-points { grid-template-columns: 1fr; }
  .footer-inner { flex-wrap: wrap; padding: 20px 0; }
  .footer a { margin-left: 0; width: 100%; }
}