/* Blog index and post card styles */
.blog-index-hero {
  padding: 48px 24px 40px;
  background:
    radial-gradient(ellipse at 20% 30%, var(--navy-50) 0%, transparent 50%),
    var(--white);
  border-bottom: 0.5px solid var(--border-light);
}
.blog-index-hero__inner {
  max-width: 960px;
  margin: 0 auto;
}
.blog-index-hero__inner h1 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.blog-index-hero__sub {
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 600px;
}

/* Post grid */
.blog-index-grid {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.blog-card {
  display: grid;
  grid-template-columns: 1fr;
  border: 0.5px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, transform 0.2s;
}
.blog-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.blog-card__body {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.blog-card__tag {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--navy-50);
  color: var(--navy-700);
}
.blog-card__title {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}
.blog-card__excerpt {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.blog-card__read {
  font-size: 15px;
  font-weight: 500;
  color: var(--navy-700);
  margin-top: auto;
}

/* Blog post layout */
.blog-hero {
  padding: 48px 24px 40px;
  background:
    radial-gradient(ellipse at 20% 30%, var(--navy-50) 0%, transparent 50%),
    var(--white);
  border-bottom: 0.5px solid var(--border-light);
}
.blog-hero__inner {
  max-width: 760px;
  margin: 0 auto;
}
.blog-hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.blog-hero__tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--navy-700);
  color: var(--white);
}
.blog-hero__inner h1 {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.blog-hero__subtitle {
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 640px;
}

/* Article body */
.blog-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.blog-body h2 {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-top: 48px;
  margin-bottom: 16px;
}
.blog-body h3 {
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-top: 36px;
  margin-bottom: 12px;
}
.blog-body p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}
.blog-body ul, .blog-body ol {
  margin: 0 0 24px 0;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.blog-body ul li, .blog-body ol li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.65;
  padding-left: 20px;
  position: relative;
}
.blog-body ul li::before, .blog-body ol li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--navy-500);
}
.blog-body ol { counter-reset: ol-counter; }
.blog-body ol li::before {
  content: counter(ol-counter);
  counter-increment: ol-counter;
  width: auto;
  height: auto;
  border-radius: 0;
  background: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--navy-700);
  top: 0;
}
.blog-body ul li strong, .blog-body ol li strong {
  color: var(--text-primary);
  font-weight: 500;
}
.blog-body a {
  color: var(--navy-700);
  text-decoration: none;
  border-bottom: 1px solid var(--navy-200);
}
.blog-body a:hover {
  border-color: var(--navy-700);
}
/* Nested list inside li */
.blog-body ul ul {
  margin-top: 12px;
  margin-bottom: 0;
  gap: 8px;
}
.blog-body ul ul li {
  font-size: 15px;
}
.blog-body ul ul li::before {
  width: 5px;
  height: 5px;
  top: 10px;
  background: var(--navy-300);
}

/* Highlight block */
.blog-highlight {
  background: var(--navy-50);
  border-left: 3px solid var(--navy-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 32px 0;
}
.blog-highlight p {
  color: var(--navy-800);
  margin-bottom: 0;
}
.blog-highlight a {
  color: var(--navy-800);
  font-weight: 500;
  border-bottom-color: var(--navy-300);
}

/* Diagram figure */
.blog-figure {
  margin: 40px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 0.5px solid var(--border-light);
  background: var(--surface);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}
.blog-figure svg {
  width: 100%;
  max-width: 600px;
}

/* Back link */
.blog-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 20px;
  transition: color 0.15s;
}
.blog-back:hover {
  color: var(--navy-700);
}

/* CTA at bottom */
.blog-cta {
  margin-top: 48px;
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 0.5px solid var(--border-light);
  text-align: center;
}
.blog-cta p {
  color: var(--text-primary);
  font-size: 17px;
  margin-bottom: 20px;
}
.blog-cta a.btn {
  display: inline-block;
  padding: 14px 28px;
  background: var(--navy-700);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: none;
  transition: opacity 0.15s;
}
.blog-cta a.btn:hover {
  opacity: 0.9;
}

@media (max-width: 640px) {
  .blog-index-hero { padding: 36px 20px 28px; }
  .blog-index-grid { padding: 32px 20px 60px; gap: 24px; }
  .blog-card__body { padding: 20px 24px; }
  .blog-hero { padding: 36px 20px 28px; }
  .blog-body { padding: 32px 20px 60px; }
  .blog-body h2 { margin-top: 36px; }
  .blog-body h3 { margin-top: 28px; }
}