.research-hero {
  overflow: hidden;
  padding: 28px 0 68px;
}

.breadcrumb {
  min-height: 44px;
  display: flex;
  align-items: center;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: color-mix(in srgb, var(--muted) 55%, transparent);
}

.breadcrumb a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
}

.site-nav a {
  min-width: 44px;
  justify-content: center;
}

.research-hero-layout {
  display: grid;
  align-items: center;
  gap: 38px;
}

.research-hero h1 {
  max-width: 19ch;
  font-size: clamp(36px, 7vw, 60px);
  font-weight: 800;
  letter-spacing: -.045em;
  line-height: 1.03;
}

.access-note {
  max-width: 58ch;
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.cta-disabled {
  min-height: 48px;
  cursor: not-allowed;
  opacity: .68;
  filter: saturate(.72);
  user-select: none;
}

.research-preview {
  position: relative;
  padding: 16px;
  border: 1px solid color-mix(in srgb, #187a78 28%, var(--border));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  box-shadow: 0 22px 58px rgba(30, 92, 104, .14);
}

.research-preview::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -32px;
  border-radius: 48px;
  background: radial-gradient(circle, rgba(35, 166, 158, .15), transparent 68%);
  filter: blur(12px);
}

.preview-head,
.preview-head > div,
.source-stack li {
  display: flex;
  align-items: center;
}

.preview-head {
  justify-content: space-between;
  gap: 12px;
  padding: 2px 2px 14px;
  font-size: 13px;
}

.preview-head > div {
  gap: 8px;
}

.preview-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #238a67;
  box-shadow: 0 0 0 4px color-mix(in srgb, #238a67 14%, transparent);
}

.preview-status,
.source-kind {
  padding: 5px 9px;
  border-radius: 999px;
  color: #187a78;
  background: color-mix(in srgb, #187a78 9%, transparent);
  font-size: 11px;
  font-weight: 800;
}

.preview-query {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface-soft) 72%, transparent);
  font-size: 12px;
}

.source-stack {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.source-stack li {
  gap: 11px;
  padding: 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface-soft) 74%, transparent);
}

.source-stack li:first-child {
  border-color: color-mix(in srgb, #187a78 28%, transparent);
  background: color-mix(in srgb, #187a78 6%, var(--surface));
}

.source-stack div {
  display: grid;
  min-width: 0;
  flex: 1;
  gap: 2px;
}

.source-stack strong {
  font-size: 13px;
}

.source-stack small,
.preview-foot {
  color: var(--muted);
  font-size: 11px;
}

.source-index {
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: #187a78;
  font-size: 10px;
  font-weight: 800;
}

.source-kind-warn {
  color: #a46100;
  background: color-mix(in srgb, #f4c76a 18%, transparent);
}

.preview-foot {
  margin-top: 12px;
  padding: 0 2px;
}

.when-grid,
.criteria-grid,
.example-grid,
.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 30px;
}

.when-grid article,
.criteria-grid li,
.research-example,
.related-grid a {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.when-grid article,
.criteria-grid li,
.research-example {
  padding: 22px;
}

.when-grid article,
.criteria-grid li {
  position: relative;
  overflow: hidden;
}

.when-grid article::after,
.criteria-grid li::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -36px;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: color-mix(in srgb, #187a78 7%, transparent);
}

.when-grid article > span,
.criteria-grid li > span {
  color: #187a78;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.when-grid h3,
.criteria-grid h3 {
  margin: 12px 0 6px;
  font-size: 17px;
}

.when-grid p,
.criteria-grid p {
  color: var(--muted);
  font-size: 14px;
}

.example-label {
  margin-bottom: 8px;
  color: #187a78;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.research-example h3 {
  font-size: 19px;
}

.research-example blockquote {
  margin: 16px 0 14px;
  padding: 14px;
  border-left: 3px solid color-mix(in srgb, #187a78 58%, transparent);
  border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, #187a78 7%, var(--surface));
  font-size: 14px;
}

#worked-example {
  scroll-margin-top: 90px;
}

.worked-example-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 30px;
  overflow-wrap: anywhere;
}

.worked-source,
.worked-result {
  min-width: 0;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.worked-result {
  border-color: color-mix(in srgb, var(--primary) 32%, var(--border));
}

.worked-example-layout h3 {
  font-size: 19px;
  margin-bottom: 18px;
}

.source-points,
.result-points {
  display: grid;
  gap: 16px;
  margin: 0;
  font-size: 14px;
}

.source-points li {
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  scroll-margin-top: 110px;
}

.result-points > div + div {
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.result-points dt {
  color: var(--primary);
  font-weight: 800;
}

.result-points dd {
  margin: 5px 0 0;
}

.worked-prompt,
.worked-check {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.research-example ul {
  display: grid;
  gap: 7px;
}

.research-example li {
  position: relative;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
}

.research-example li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #238a67;
  font-weight: 800;
}

.verify-layout,
.limits-layout {
  display: grid;
  gap: 28px;
}

.verification-flow {
  display: grid;
  gap: 10px;
}

.verification-flow li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.verification-flow li > span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: #187a78;
  background: color-mix(in srgb, #187a78 9%, transparent);
  font-size: 12px;
  font-weight: 800;
}

.verification-flow p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.research-note {
  padding: 24px;
  border: 1px solid color-mix(in srgb, #b7791f 34%, var(--border));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, #f4c76a 10%, var(--surface));
}

.research-note h3 {
  font-size: 19px;
}

.research-note ul {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.research-note li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14px;
}

.research-note li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: #a46100;
  font-weight: 800;
}

.research-note > p {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  font-weight: 700;
}

.faq-wrap {
  max-width: 820px;
}

.faq-list {
  display: grid;
  gap: 10px;
  margin-top: 28px;
}

.faq-list details {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.faq-list summary {
  min-height: 52px;
  display: flex;
  align-items: center;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 700;
}

.faq-list details p {
  padding: 0 18px 18px;
  color: var(--muted);
  font-size: 14px;
}

.related-grid a {
  min-height: 132px;
  display: grid;
  align-content: center;
  gap: 6px;
  padding: 22px;
  color: var(--text);
  text-decoration: none;
}

.related-grid a:hover {
  border-color: color-mix(in srgb, #187a78 42%, var(--border));
  box-shadow: var(--shadow-md);
}

.related-grid span {
  color: #187a78;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.related-grid small {
  color: var(--muted);
  font-size: 13px;
}

@media (min-width: 760px) {
  .when-grid,
  .criteria-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .example-grid,
  .related-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .verify-layout,
  .limits-layout {
    grid-template-columns: minmax(0, .9fr) minmax(340px, 1fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .worked-example-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .research-hero-layout {
    grid-template-columns: minmax(0, 1.02fr) minmax(360px, .78fr);
    gap: 54px;
  }
}

@media (prefers-color-scheme: dark) {
  .worked-example-layout dt,
  .worked-example-layout a {
    color: #c5b6ff;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}