.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0;
  color: #6a7a89;
  font-size: 13px;
}

.breadcrumbs a {
  color: #315b7c;
  text-decoration: none;
}

.breadcrumbs span:not(:last-child)::after,
.breadcrumbs a::after {
  content: "/";
  margin-left: 8px;
  color: #a5b0ba;
}

.knowledge-hero,
.article-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(120deg, #071e3d 0%, #0a3d73 65%, #126ca3 100%);
}

.knowledge-hero::after,
.article-hero::after {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -160px;
  top: -220px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 50%;
  box-shadow: 0 0 0 90px rgba(255,255,255,.03), 0 0 0 180px rgba(255,255,255,.025);
}

.knowledge-hero .container,
.article-hero .container {
  position: relative;
  z-index: 1;
}

.knowledge-hero .hero-copy {
  max-width: 840px;
  padding: 86px 0 92px;
}

.article-hero .hero-copy {
  max-width: 900px;
  padding: 62px 0 76px;
}

.knowledge-hero h1,
.article-hero h1 {
  margin: 0;
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.2;
  letter-spacing: -.035em;
}

.article-hero h1 {
  font-size: clamp(34px, 4.2vw, 52px);
}

.knowledge-hero .lead,
.article-hero .lead {
  max-width: 820px;
  margin: 22px 0 0;
  color: rgba(255,255,255,.78);
  font-size: 18px;
  line-height: 1.9;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 28px;
  color: rgba(255,255,255,.62);
  font-size: 13px;
}

.knowledge-intro {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 70px;
  align-items: start;
}

.knowledge-intro h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(30px, 3.5vw, 44px);
  line-height: 1.25;
}

.knowledge-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  min-height: 270px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  background: #fff;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.topic-card:first-child {
  grid-column: 1 / -1;
  min-height: 230px;
  background: linear-gradient(135deg, #f2f7fa, #fff);
}

.topic-card:hover {
  transform: translateY(-4px);
  border-color: #adc8db;
  box-shadow: var(--shadow);
}

.topic-card .topic-tag {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
}

.topic-card h2,
.topic-card h3 {
  margin: 18px 0 12px;
  color: var(--navy);
  font-size: 24px;
  line-height: 1.45;
}

.topic-card h3 { font-size: 21px; }
.topic-card p { margin: 0; color: var(--muted); }
.topic-card strong { margin-top: auto; padding-top: 24px; color: var(--blue); font-size: 14px; }

.reading-path {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  list-style: none;
}

.reading-path li {
  padding: 26px;
  border-right: 1px solid var(--line);
  background: #fff;
}

.reading-path li:last-child { border-right: 0; }
.reading-path span { color: var(--blue); font-size: 12px; font-weight: 800; }
.reading-path strong { display: block; margin: 8px 0 6px; color: var(--navy); }
.reading-path p { margin: 0; color: var(--muted); font-size: 14px; }

.article-shell { padding: 64px 0 100px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 780px) 280px; gap: 76px; align-items: start; }
.article-content { min-width: 0; }
.article-content h2 { margin: 54px 0 18px; color: var(--navy); font-size: 30px; line-height: 1.35; }
.article-content h2:first-of-type { margin-top: 0; }
.article-content h3 { margin: 34px 0 12px; color: #173e63; font-size: 21px; line-height: 1.45; }
.article-content p { margin: 0 0 18px; color: #33485c; font-size: 16px; line-height: 1.95; }
.article-content ul,
.article-content ol { margin: 0 0 22px; padding-left: 24px; color: #33485c; }
.article-content li { margin: 8px 0; padding-left: 4px; line-height: 1.8; }
.article-content a { color: var(--blue); text-underline-offset: 3px; }

.key-answer {
  margin: 0 0 38px;
  padding: 24px 26px;
  border-left: 4px solid var(--cyan);
  border-radius: 0 10px 10px 0;
  background: #eef7fa;
}

.key-answer strong { display: block; margin-bottom: 8px; color: var(--navy); font-size: 17px; }
.key-answer p { margin: 0; color: #36566d; }

.article-callout {
  margin: 30px 0;
  padding: 22px 24px;
  border: 1px solid #cddde8;
  border-radius: 12px;
  background: #f7fafc;
}

.article-callout strong { color: var(--navy); }
.article-callout p:last-child { margin-bottom: 0; }

.definition-table {
  width: 100%;
  margin: 24px 0 34px;
  border-collapse: collapse;
  border: 1px solid var(--line);
  font-size: 15px;
}

.definition-table th,
.definition-table td {
  padding: 15px 16px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.definition-table th { color: var(--navy); background: #f2f7fa; }
.definition-table td { color: #405467; }

.article-toc {
  position: sticky;
  top: 104px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.article-toc > strong { color: var(--navy); font-size: 16px; }
.article-toc ol { margin: 14px 0 0; padding: 0; list-style: none; counter-reset: toc; }
.article-toc li { counter-increment: toc; margin: 0; border-top: 1px solid #edf1f4; }
.article-toc a { display: block; padding: 10px 0; color: #526678; text-decoration: none; font-size: 14px; line-height: 1.5; }
.article-toc a::before { content: counter(toc, decimal-leading-zero) " "; color: #8fa3b3; font-size: 11px; }
.article-toc .service-link { display: block; margin-top: 18px; padding: 11px 14px; border-radius: 6px; color: #fff; background: var(--navy); text-align: center; text-decoration: none; font-size: 13px; font-weight: 700; }

.article-faq { margin-top: 54px; }
.article-faq details { border-bottom: 1px solid var(--line); }
.article-faq summary { padding: 18px 34px 18px 0; color: var(--navy); cursor: pointer; font-weight: 700; }
.article-faq details p { padding: 0 0 18px; }

.related-articles { padding: 72px 0; background: var(--tint); }
.related-articles h2 { margin: 0 0 28px; color: var(--navy); font-size: 30px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.related-grid a { display: block; min-height: 150px; padding: 24px; border: 1px solid var(--line); border-radius: 12px; color: var(--navy); background: #fff; text-decoration: none; font-weight: 700; line-height: 1.6; }
.related-grid span { display: block; margin-top: 18px; color: var(--blue); font-size: 13px; font-weight: 700; }

@media (max-width: 940px) {
  .article-layout { grid-template-columns: 1fr; gap: 40px; }
  .article-toc { position: static; order: -1; }
}

@media (max-width: 740px) {
  .knowledge-hero .hero-copy,
  .article-hero .hero-copy { padding: 56px 0 62px; }
  .knowledge-hero h1,
  .article-hero h1 { font-size: 36px; }
  .knowledge-intro,
  .topic-grid,
  .reading-path,
  .related-grid { grid-template-columns: 1fr; }
  .knowledge-intro { gap: 24px; }
  .topic-card:first-child { grid-column: auto; }
  .reading-path li { border-right: 0; border-bottom: 1px solid var(--line); }
  .reading-path li:last-child { border-bottom: 0; }
  .article-shell { padding: 48px 0 72px; }
  .article-content h2 { margin-top: 42px; font-size: 26px; }
  .definition-table { display: block; overflow-x: auto; }
}