:root {
  --series-navy: #003870;
  --series-blue: #0066b3;
  --series-bright: #117fc3;
  --series-lime: #ccdb2f;
  --series-ink: #183047;
  --series-muted: #5f7182;
  --series-pale: #f3f8fc;
}

.behavioral-article .article-hero {
  background: radial-gradient(circle at 84% 22%, rgba(17,127,195,.23), transparent 30%), linear-gradient(135deg, #003870 0%, #082b50 100%);
}
.behavioral-article .article-hero h1 { max-width: 1120px; }
.behavioral-article .article-dek { max-width: 900px; }
.behavioral-article .article-byline a,
.behavioral-article .article-byline a:visited,
.behavioral-article .article-byline a:hover,
.behavioral-article .article-byline a:focus {
  color: #fff;
  text-decoration-color: var(--series-lime);
}

.article-answer {
  margin: 34px 0 48px;
  padding: 28px 30px;
  border-left: 5px solid var(--series-lime);
  border-radius: 0 12px 12px 0;
  background: var(--series-pale);
  box-shadow: 0 14px 34px rgba(0,56,112,.08);
}
.article-answer .article-answer-label {
  margin: 0 0 10px;
  color: var(--series-blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.article-answer p:last-child {
  margin: 0;
  color: var(--series-ink);
  font-size: clamp(1.08rem, 1.6vw, 1.3rem);
  font-weight: 650;
  line-height: 1.55;
}
.article-sources { margin: 18px 0 44px; padding-left: 1.4rem; }
.article-sources li { margin: 0 0 12px; padding-left: 6px; color: var(--series-muted); line-height: 1.55; }
.article-sources a { color: var(--series-blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article-sources a:hover, .article-sources a:focus { color: var(--series-navy); }
.series-back { display: inline-flex; margin-top: 24px; color: var(--series-blue); font-size: 14px; font-weight: 750; text-decoration: none; }

.cta-final > h2 { max-width: 760px; margin: 0 auto 16px; color: #fff; }
.cta-final-intro { max-width: 680px; margin: 0 auto 40px; color: var(--series-lime); font-size: 18px; font-style: italic; }
.cta-diagnostic-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; max-width: 1100px; margin: 0 auto 36px; }
.cta-diagnostic { padding: 28px 24px; border: 1px solid rgba(204,219,47,.4); border-top: 3px solid var(--series-lime); border-radius: 10px; background: rgba(255,255,255,.04); text-align: left; }
.cta-diagnostic-label { margin-bottom: 14px; color: var(--series-lime); font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; }
.cta-diagnostic h3 { min-height: 51px; margin: 0 0 16px; padding-bottom: 16px; border-bottom: 1px solid rgba(204,219,47,.3); color: #fff; font-size: 19px; font-weight: 800; line-height: 1.3; }
.cta-diagnostic p { margin: 0; color: rgba(255,255,255,.78); font-size: 14px; line-height: 1.6; }

.behavioral-series {
  overflow: hidden;
  background: radial-gradient(circle at 88% 0, rgba(17,127,195,.13), transparent 30%), #fff;
}
.journey-series {
  background: radial-gradient(circle at 12% 0, rgba(0,102,179,.14), transparent 32%), #f3f8fc;
  border-top: 1px solid #dbe7f0;
  border-bottom: 1px solid #dbe7f0;
}
.activation-series {
  background: radial-gradient(circle at 88% 8%, rgba(204,219,47,.18), transparent 30%), linear-gradient(180deg, #ffffff 0%, #f7faf2 100%);
  border-top: 1px solid #dfe7cb;
  border-bottom: 1px solid #dfe7cb;
}
.activation-series .series-card { border-top: 4px solid var(--series-lime); }
.activation-series .series-card__topline { color: #52710a; }
.activation-series .series-filter:hover,
.activation-series .series-filter:focus-visible,
.activation-series .series-filter.is-active { border-color: var(--series-navy); background: var(--series-navy); }
.behavioral-series__intro {
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(320px, 1.28fr);
  gap: clamp(32px, 6vw, 90px);
  align-items: end;
  margin-bottom: 36px;
}
.behavioral-series__eyebrow { margin: 0 0 12px; color: var(--series-blue); font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.behavioral-series__intro h2 { margin: 0; color: var(--series-navy); font-size: clamp(2.2rem, 4.6vw, 4.8rem); line-height: .98; letter-spacing: -.045em; }
.behavioral-series__intro p { margin: 0; color: var(--series-ink); font-size: clamp(1.05rem, 1.6vw, 1.35rem); line-height: 1.55; }

.series-filters { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 30px; }
.series-filter {
  appearance: none;
  padding: 10px 15px;
  border: 1px solid #cbd8e3;
  border-radius: 999px;
  background: #fff;
  color: var(--series-ink);
  font: inherit;
  font-size: 13px;
  font-weight: 750;
  cursor: pointer;
}
.series-filter:hover, .series-filter:focus-visible, .series-filter.is-active { border-color: var(--series-blue); background: var(--series-blue); color: #fff; }

.series-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.series-card {
  display: flex;
  min-height: 340px;
  flex-direction: column;
  padding: 28px;
  border: 1px solid #d8e2eb;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(0,56,112,.07);
  color: var(--series-ink);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.series-card:hover, .series-card:focus-visible { transform: translateY(-4px); border-color: var(--series-bright); box-shadow: 0 20px 46px rgba(0,56,112,.13); }
.series-card[hidden] { display: none; }
.series-card__topline { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 24px; color: var(--series-blue); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.series-card h3 { margin: 0 0 16px; color: var(--series-navy); font-size: clamp(1.35rem, 2vw, 1.85rem); line-height: 1.12; letter-spacing: -.025em; }
.series-card__excerpt { margin: 0 0 24px; color: var(--series-muted); font-size: 15px; line-height: 1.62; }
.series-card__meta { display: grid; gap: 5px; margin-top: auto; padding-top: 18px; border-top: 1px solid #e4ebf1; color: var(--series-muted); font-size: 12px; }
.series-card__author { color: var(--series-navy); font-weight: 750; }
.series-card__action { display: inline-flex; margin-top: 17px; color: var(--series-blue); font-size: 13px; font-weight: 800; }

@media (max-width: 980px) {
  .series-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cta-diagnostic-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .behavioral-series__intro { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr; }
  .series-card { min-height: 0; }
  .article-answer { padding: 22px 20px; }
}