/* Buckner Intelligence public research layer.
   Narrow scope: research landing, article reading surface, and homepage research feature. */

.research-feature-section {
  background: var(--white);
  border-top: 1px solid var(--ink-line);
}

.research-feature-layout {
  display: grid;
  grid-template-columns: minmax(300px, .8fr) minmax(520px, 1.2fr);
  gap: 86px;
  align-items: start;
}

.research-feature-heading h2,
.research-index-hero h1,
.article-header h1 {
  color: var(--ink);
  font-weight: 650;
  letter-spacing: -.043em;
}

.research-feature-heading h2 {
  max-width: 620px;
  margin: 24px 0 22px;
  font-size: clamp(38px, 4vw, 58px);
  line-height: 1.04;
}

.research-feature-heading > p:last-child {
  max-width: 590px;
  margin: 0;
  color: var(--ink-2);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.65;
}

.research-feature-card {
  padding: 30px 0 32px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink-line);
}

.research-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  color: var(--blue-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.research-meta time,
.article-meta time {
  color: var(--ink-2);
  font-weight: 700;
}

.research-feature-card h3 {
  max-width: 720px;
  margin: 24px 0 16px;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.research-feature-card h3 a:hover,
.research-list-item h2 a:hover {
  color: var(--blue-dark);
}

.research-feature-card > p {
  max-width: 700px;
  margin: 0 0 24px;
  color: var(--ink-2);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.65;
}

.research-index-link {
  margin-top: 34px;
  text-align: right;
}

.research-page,
.research-article-page {
  background: var(--blue-soft);
}

.research-index-hero {
  padding: 84px 0 66px;
  border-bottom: 1px solid var(--ink-line);
}

.research-index-hero .eyebrow {
  margin-bottom: 20px;
}

.research-index-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(50px, 6vw, 76px);
  line-height: 1.01;
}

.research-index-hero .hero-lede {
  max-width: 760px;
  margin: 28px 0 0;
  text-align: left;
}

.research-list-section {
  padding: 70px 0 96px;
}

.research-list {
  border-top: 1px solid var(--ink);
}

.research-list-item {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 48px;
  padding: 34px 0 38px;
  border-bottom: 1px solid var(--ink-line);
}

.research-list-item h2 {
  max-width: 800px;
  margin: 0 0 14px;
  font-size: clamp(29px, 3vw, 42px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.research-list-item p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-2);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.65;
}

.article-header {
  padding: 76px 0 58px;
  border-bottom: 1px solid var(--ink-line);
}

.article-shell {
  width: min(900px, calc(100vw - 72px));
  margin-inline: auto;
}

.article-header h1 {
  max-width: 900px;
  margin: 24px 0 22px;
  font-size: clamp(48px, 5.7vw, 76px);
  line-height: 1.01;
}

.article-dek {
  max-width: 790px;
  margin: 0;
  color: var(--ink-2);
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 500;
  line-height: 1.5;
}

.article-byline {
  margin: 28px 0 0;
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 650;
}

.article-body {
  padding: 62px 0 92px;
}

.article-body .article-shell {
  width: min(760px, calc(100vw - 72px));
}

.article-body p,
.article-body li {
  color: var(--ink);
  font-size: 18px;
  line-height: 1.78;
}

.article-body p {
  margin: 0 0 24px;
}

.article-body h2 {
  margin: 58px 0 20px;
  color: var(--ink);
  font-size: clamp(30px, 3vw, 40px);
  line-height: 1.12;
  letter-spacing: -.03em;
}

.article-body h3 {
  margin: 38px 0 14px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.25;
}

.article-body a {
  color: var(--blue-dark);
  text-decoration: underline;
  text-decoration-color: var(--blue-line);
  text-underline-offset: 3px;
}

.article-body a:hover {
  text-decoration-color: var(--blue-dark);
}

.article-body ul {
  margin: 0 0 28px;
  padding-left: 24px;
}

.article-callout {
  margin: 42px 0;
  padding: 26px 28px;
  background: var(--blue-soft);
  border-left: 4px solid var(--blue-dark);
}

.article-callout p {
  margin: 0;
  color: var(--ink);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.5;
}

.article-model {
  margin: 34px 0;
  padding: 24px 26px;
  background: var(--cream);
  border: 1px solid var(--ink-line);
}

.article-model code {
  display: block;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.9;
  white-space: normal;
}

.article-note {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--ink-line);
  color: var(--ink-2);
  font-size: 14px !important;
  line-height: 1.65 !important;
}

.sources-list {
  margin-top: 18px;
  padding-left: 22px;
}


.sources-list a {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.sources-list li {
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.6;
}

.article-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid var(--ink);
  font-weight: 750;
}

.site-nav .is-current {
  border-color: rgba(255,255,255,.82);
}

@media (max-width: 1020px) {
  .research-feature-layout,
  .research-list-item {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .research-feature-heading h2 {
    margin-top: 18px;
  }

  .research-list-item {
    gap: 18px;
  }

  .site-nav .is-current {
    border-color: var(--blue-dark);
  }
}

@media (max-width: 640px) {
  .research-index-hero {
    padding: 52px 0 44px;
  }

  .research-index-hero h1,
  .article-header h1 {
    font-size: clamp(38px, 11vw, 50px);
  }

  .research-index-hero .hero-lede {
    font-size: 17px;
  }

  .research-list-section {
    padding: 46px 0 64px;
  }

  .research-feature-card {
    padding-top: 22px;
  }

  .research-feature-card h3,
  .research-list-item h2 {
    font-size: 28px;
  }

  .article-header {
    padding: 50px 0 42px;
  }

  .article-shell,
  .article-body .article-shell {
    width: calc(100vw - 32px);
  }

  .article-dek {
    font-size: 18px;
  }

  .article-body {
    padding: 42px 0 64px;
  }

  .article-body p,
  .article-body li {
    font-size: 17px;
    line-height: 1.72;
  }

  .article-body h2 {
    margin-top: 46px;
  }

  .article-callout {
    margin: 34px 0;
    padding: 22px 20px;
  }

  .article-callout p {
    font-size: 19px;
  }

  .article-model {
    padding: 20px;
  }

  .article-footer-nav {
    flex-direction: column;
  }
}