:root {
  --ink: #061229;
  --muted: #516079;
  --soft: #f5f8fc;
  --panel: rgba(255, 255, 255, 0.82);
  --line: rgba(25, 54, 93, 0.16);
  --blue: #0b63f6;
  --navy: #071b63;
  --cyan: #36d0d7;
  --violet: #6d4aff;
  --red: #f04438;
  --green: #16a34a;
  --shadow: 0 24px 80px rgba(14, 45, 88, 0.16);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 10% -10%, rgba(54, 208, 215, 0.26), transparent 32rem),
    radial-gradient(circle at 88% 4%, rgba(109, 74, 255, 0.18), transparent 34rem),
    linear-gradient(180deg, #fbfdff 0%, #f4f8ff 44%, #ffffff 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

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

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.page-shell {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 16px 0 42px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 40px rgba(20, 50, 90, 0.09);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 13px;
  color: white;
  font-size: 13px;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  box-shadow: 0 8px 20px rgba(11, 99, 246, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav-links a:hover {
  color: var(--blue);
}

/* More Research dropdown */
.nav-dropdown {
  position: relative;
  display: inline-flex;
}

.nav-dropdown-toggle {
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-dropdown-toggle::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform 0.2s ease;
}

.nav-dropdown:hover .nav-dropdown-toggle,
.nav-dropdown:focus-within .nav-dropdown-toggle {
  color: var(--blue);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 190px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 18px 45px rgba(20, 50, 90, 0.14);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  z-index: 40;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown:hover .nav-dropdown-toggle::after,
.nav-dropdown:focus-within .nav-dropdown-toggle::after {
  transform: rotate(-135deg) translateY(-1px);
}

.nav-dropdown-menu a {
  padding: 8px 12px;
  border-radius: 11px;
  color: var(--muted);
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  color: var(--blue);
  background: rgba(11, 99, 246, 0.08);
}

.section {
  margin: 82px 0;
}

.hero {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 34px;
  margin-top: 28px;
}

.hero-copy h1 {
  margin: 12px 0 18px;
  font-family: "Newsreader", Georgia, serif;
  font-size: clamp(48px, 6vw, 84px);
  line-height: 0.92;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 620px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.55;
}

.authors {
  color: var(--navy);
  font-weight: 800;
  line-height: 1.45;
}

.authors sup {
  color: var(--blue);
}

.author-note {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.author-note sup {
  color: var(--blue);
}

.eyebrow {
  margin: 0;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--navy);
  background: rgba(255, 255, 255, 0.78);
  font-weight: 800;
  box-shadow: 0 8px 22px rgba(20, 50, 90, 0.08);
}

.button.primary {
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, var(--blue), var(--violet));
}

.hero-card,
.figure-panel,
.wide-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 12px;
  transform: rotate(0.4deg);
}

.hero-card img {
  border-radius: 20px;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 46px 0 84px;
}

.stats-bar div {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.66);
  box-shadow: 0 16px 40px rgba(20, 50, 90, 0.08);
}

.stats-bar strong {
  display: block;
  color: var(--navy);
  font-size: 34px;
  line-height: 1;
}

.stats-bar span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.split-section {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  align-items: center;
  gap: 34px;
}

.section-copy h2,
.section-heading h2 {
  margin: 10px 0 16px;
  font-family: "Newsreader", Georgia, serif;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.section-copy p,
.section-heading p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.section-heading {
  max-width: 790px;
  margin-bottom: 26px;
}

.section-heading.centered {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.check-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin: 12px 0;
  padding-left: 30px;
  color: #25344e;
  line-height: 1.45;
  font-weight: 650;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 18px;
  height: 18px;
  content: "";
  border-radius: 50%;
  background: radial-gradient(circle at 40% 38%, white 0 22%, transparent 24%), linear-gradient(135deg, var(--green), #6ee7b7);
}

.figure-panel {
  padding: 10px;
}

.figure-panel img,
.wide-figure img {
  width: 100%;
  border-radius: 20px;
}

figcaption {
  padding: 12px 10px 4px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 30px 0;
}

/* Open resources (HF models & datasets) */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 30px 0 0;
}

.resource-card {
  display: block;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 18px 45px rgba(20, 50, 90, 0.09);
  color: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.resource-card:hover {
  transform: translateY(-4px);
  border-color: rgba(11, 99, 246, 0.45);
  box-shadow: 0 22px 55px rgba(20, 50, 90, 0.16);
}

.resource-tag {
  display: inline-flex;
  padding: 5px 11px;
  border-radius: 999px;
  color: var(--blue);
  background: rgba(11, 99, 246, 0.1);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.resource-tag.data {
  color: #b5710a;
  background: rgba(255, 176, 32, 0.16);
}

.resource-card h3 {
  margin: 14px 0 8px;
  font-size: 19px;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.resource-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.method-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 18px 45px rgba(20, 50, 90, 0.09);
}

.method-card.accent {
  color: white;
  background: linear-gradient(145deg, #081a5a, #0b63f6 65%, #36d0d7);
}

.method-card h3 {
  margin: 12px 0 10px;
  font-size: 23px;
  letter-spacing: -0.03em;
}

.method-card p {
  margin: 0;
  color: inherit;
  opacity: 0.78;
  line-height: 1.55;
}

.step {
  display: inline-flex;
  padding: 7px 11px;
  border-radius: 999px;
  color: var(--blue);
  background: rgba(11, 99, 246, 0.1);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.accent .step {
  color: white;
  background: rgba(255, 255, 255, 0.18);
}

.wide-figure {
  padding: 12px;
}

.wide-figure.compact {
  margin-top: 18px;
}

.results-section {
  padding: 46px;
  border-radius: 36px;
  background: linear-gradient(180deg, rgba(236, 246, 255, 0.72), rgba(255, 255, 255, 0.8));
  border: 1px solid var(--line);
}

.result-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 26px;
}

.result-cards article {
  padding: 24px;
  border-radius: 24px;
  background: white;
  border: 1px solid rgba(11, 99, 246, 0.12);
  box-shadow: 0 14px 40px rgba(20, 50, 90, 0.08);
}

.result-cards span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.result-cards strong {
  display: block;
  margin: 10px 0;
  color: var(--navy);
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.04em;
}

.result-cards p {
  margin: 0;
  color: var(--muted);
  line-height: 1.4;
  font-weight: 650;
}

.figure-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

/* Vertically stacked result figures */
.figure-stack {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.figure-stack .figure-panel img {
  width: 100%;
  height: auto;
}

/* Qualitative cases carousel: one full-width image with prev/next arrows */
.carousel {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
}

.carousel-viewport {
  position: relative;
  flex: 1;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 18px 45px rgba(20, 50, 90, 0.09);
  padding: 18px;
  overflow: hidden;
}

.carousel-slide {
  margin: 0;
  display: none;
}

.carousel-slide.is-active {
  display: block;
  animation: carousel-fade 0.35s ease;
}

.carousel-slide img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  display: block;
}

@keyframes carousel-fade {
  from { opacity: 0; transform: translateX(8px); }
  to   { opacity: 1; transform: translateX(0); }
}

.carousel-arrow {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  color: var(--blue);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 26px rgba(20, 50, 90, 0.12);
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.carousel-arrow:hover {
  transform: scale(1.08);
  background: var(--blue);
  color: white;
}

.carousel-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 14px;
  display: flex;
  justify-content: center;
  gap: 7px;
  pointer-events: none;
}

.carousel-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(11, 99, 246, 0.25);
  cursor: pointer;
  pointer-events: auto;
  transition: background 0.18s ease, transform 0.18s ease;
}

.carousel-dots button.is-active {
  background: var(--blue);
  transform: scale(1.25);
}

.citation-section {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 28px;
  align-items: start;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  color: #dbeafe;
  background: #071225;
  box-shadow: var(--shadow);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin: 90px 0 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-weight: 800;
}

.site-footer a {
  margin-left: 18px;
  color: var(--navy);
}

@media (max-width: 960px) {
  .site-header {
    align-items: flex-start;
    border-radius: 26px;
  }

  .nav-links {
    display: none;
  }

  .hero,
  .split-section,
  .citation-section {
    grid-template-columns: 1fr;
  }

  .stats-bar,
  .method-grid,
  .result-cards,
  .figure-grid,
  .example-grid {
    grid-template-columns: 1fr;
  }

  .carousel {
    gap: 8px;
  }

  .carousel-arrow {
    width: 38px;
    height: 38px;
    font-size: 20px;
  }

  .results-section {
    padding: 24px;
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(100% - 22px, 1180px);
  }

  .hero-copy h1 {
    font-size: 44px;
  }

  .section {
    margin: 58px 0;
  }

  .stats-bar div,
  .method-card {
    padding: 20px;
  }
}