:root {
  --blog-ink: #172033;
  --blog-muted: #58677d;
  --blog-line: #dbe4f0;
  --blog-surface: #ffffff;
  --blog-soft: #f4f7fb;
  --blog-accent: #2563eb;
  --blog-accent-dark: #1d4ed8;
}

.blog-hero {
  padding: 96px 20px 70px;
  color: #fff;
  text-align: center;
  background:
    radial-gradient(circle at 15% 20%, rgba(96, 165, 250, .28), transparent 30%),
    radial-gradient(circle at 85% 10%, rgba(167, 139, 250, .25), transparent 34%),
    linear-gradient(135deg, #0f172a, #1e3a8a 58%, #312e81);
}

.blog-hero .eyebrow,
.article-hero .eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  color: #bfdbfe;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.blog-hero h1,
.article-hero h1 {
  max-width: 900px;
  margin: 0 auto 18px;
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 1.08;
}

.blog-hero p {
  max-width: 760px;
  margin: 0 auto;
  color: #dbeafe;
  font-size: 1.08rem;
  line-height: 1.75;
}

.blog-section {
  padding: 64px 20px 84px;
  background: var(--blog-soft);
}

.topic-banner-section {
  padding: 52px 20px;
  background: #fff;
}

.topic-banner-heading {
  margin: 0 0 8px;
  color: var(--blog-ink);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.topic-banner-intro {
  margin: 0 0 26px;
  color: var(--blog-muted);
  line-height: 1.7;
}

.topic-banner-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.topic-banner-card {
  overflow: hidden;
  color: var(--blog-ink);
  text-decoration: none;
  border: 1px solid var(--blog-line);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 23, 42, .08);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.topic-banner-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: 0 18px 38px rgba(37, 99, 235, .14);
}

.topic-banner-card:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .3);
  outline-offset: 4px;
}

.topic-banner-card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 630;
  object-fit: cover;
}

.topic-banner-copy {
  display: block;
  padding: 16px 18px 18px;
}

.topic-banner-copy strong {
  display: block;
  margin-bottom: 5px;
  font-size: 1.05rem;
}

.topic-banner-copy span {
  color: var(--blog-muted);
  font-size: .9rem;
  line-height: 1.55;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.blog-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  overflow: hidden;
  color: var(--blog-ink);
  text-decoration: none;
  border: 1px solid var(--blog-line);
  border-radius: 18px;
  background: var(--blog-surface);
  box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: 0 18px 40px rgba(37, 99, 235, .13);
}

.blog-card-visual {
  display: grid;
  min-height: 150px;
  place-items: center;
  font-size: 3rem;
  background: linear-gradient(135deg, #dbeafe, #ede9fe);
}

.blog-card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 24px;
}

.blog-card-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--blog-muted);
  font-size: .82rem;
}

.blog-card h2 {
  margin: 14px 0 10px;
  font-size: 1.28rem;
  line-height: 1.35;
}

.blog-card p {
  margin: 0 0 22px;
  color: var(--blog-muted);
  line-height: 1.7;
}

.blog-card .read-more {
  margin-top: auto;
  color: var(--blog-accent);
  font-weight: 800;
}

.article-hero {
  padding: 88px 20px 54px;
  color: #fff;
  text-align: center;
  background: linear-gradient(135deg, #0f172a, #1e3a8a 62%, #3730a3);
}

.article-hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.article-hero .dek {
  max-width: 780px;
  margin: 0 auto 22px;
  color: #dbeafe;
  font-size: 1.08rem;
  line-height: 1.75;
}

.article-hero .article-meta {
  justify-content: center;
  color: #bfdbfe;
}

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 760px) 240px;
  gap: 44px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 54px 20px 86px;
}

.article-content {
  color: var(--blog-ink);
  font-size: 1.02rem;
  line-height: 1.82;
}

.article-content h2 {
  margin: 2.3rem 0 .8rem;
  font-size: 1.7rem;
  line-height: 1.28;
}

.article-content h3 {
  margin: 1.7rem 0 .55rem;
  font-size: 1.24rem;
}

.article-content p,
.article-content ul,
.article-content ol {
  margin: 0 0 1.25rem;
}

.article-content a {
  color: var(--blog-accent-dark);
  font-weight: 650;
}

.article-content blockquote,
.article-callout {
  margin: 1.8rem 0;
  padding: 20px 22px;
  border-left: 4px solid var(--blog-accent);
  border-radius: 0 12px 12px 0;
  background: #eff6ff;
}

.article-content table {
  width: 100%;
  margin: 1.5rem 0 2rem;
  border-collapse: collapse;
  font-size: .94rem;
}

.article-content th,
.article-content td {
  padding: 12px;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--blog-line);
}

.article-content th {
  background: #eff6ff;
}

.article-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  padding: 20px;
  border: 1px solid var(--blog-line);
  border-radius: 14px;
  background: var(--blog-surface);
}

.article-toc strong {
  display: block;
  margin-bottom: 10px;
}

.article-toc a {
  display: block;
  padding: 6px 0;
  color: var(--blog-muted);
  font-size: .88rem;
  line-height: 1.35;
  text-decoration: none;
}

.article-toc a:hover {
  color: var(--blog-accent);
}

.article-author {
  display: flex;
  gap: 16px;
  margin-top: 42px;
  padding: 22px;
  border: 1px solid var(--blog-line);
  border-radius: 14px;
  background: var(--blog-soft);
}

.article-author .avatar {
  display: grid;
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
}

.faq-list details {
  margin-bottom: 10px;
  padding: 14px 16px;
  border: 1px solid var(--blog-line);
  border-radius: 12px;
  background: #fff;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 800;
}

.faq-list details p {
  margin: 12px 0 0;
}

.blog-breadcrumb {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 20px 0;
  color: var(--blog-muted);
  font-size: .88rem;
}

.blog-breadcrumb a {
  color: var(--blog-accent);
  text-decoration: none;
}

@media (max-width: 900px) {
  .blog-grid { grid-template-columns: 1fr; }
  .topic-banner-grid { grid-template-columns: 1fr; }
  .article-shell { grid-template-columns: 1fr; }
  .article-toc { position: static; order: -1; }
}

body.dark-mode .blog-section,
body.dark-mode .article-shell { background: #0f172a; }
body.dark-mode .topic-banner-section { background: #0f172a; }
body.dark-mode .blog-card,
body.dark-mode .topic-banner-card,
body.dark-mode .article-toc,
body.dark-mode .faq-list details { color: #e5e7eb; border-color: #334155; background: #172033; }
body.dark-mode .blog-card p,
body.dark-mode .topic-banner-heading,
body.dark-mode .topic-banner-card,
body.dark-mode .topic-banner-intro,
body.dark-mode .blog-card-meta,
body.dark-mode .article-content,
body.dark-mode .article-toc a,
body.dark-mode .blog-breadcrumb { color: #cbd5e1; }
body.dark-mode .article-callout,
body.dark-mode .article-content blockquote,
body.dark-mode .article-content th { background: #172554; }
body.dark-mode .article-author { border-color: #334155; background: #172033; }