/* AI Research blog — shared styles */
:root {
  --blog-bg: #ffffff;
  --blog-text: #1a1a1a;
  --blog-muted: #5c5c5c;
  --blog-accent: #1f5bff;
  --blog-accent-hover: #0d4ae8;
  --blog-border: #e5e5e5;
  --blog-dark: #0a0a0a;
  --blog-code-bg: #f4f6f8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.blog-body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.65;
  color: var(--blog-text);
  background: var(--blog-bg);
  font-size: 1.05rem;
}

.blog-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.blog-nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.blog-nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

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

.blog-nav-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  flex-wrap: wrap;
}

.blog-lang a {
  font-weight: 500;
  opacity: 0.85;
}

.blog-lang a.active {
  color: var(--blog-accent);
  opacity: 1;
}

.blog-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.blog-article h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.blog-meta {
  color: var(--blog-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.blog-lead {
  font-size: 1.12rem;
  color: #333;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--blog-border);
}

.blog-article h2 {
  font-size: 1.35rem;
  margin: 2.25rem 0 0.75rem;
  letter-spacing: -0.01em;
}

.blog-article h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  color: #222;
}

.blog-article p {
  margin: 0 0 1rem;
}

.blog-article ul,
.blog-article ol {
  margin: 0 0 1rem 1.25rem;
  padding: 0;
}

.blog-article li {
  margin-bottom: 0.35rem;
}

.blog-figure {
  margin: 1.75rem 0;
  padding: 1rem;
  background: var(--blog-code-bg);
  border-radius: 8px;
  border: 1px solid var(--blog-border);
  overflow-x: auto;
}

.blog-figure figcaption {
  margin-top: 0.75rem;
  font-size: 0.88rem;
  color: var(--blog-muted);
}

.blog-table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
}

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.blog-article th,
.blog-article td {
  border: 1px solid var(--blog-border);
  padding: 0.6rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.blog-article th {
  background: var(--blog-code-bg);
  font-weight: 600;
}

.blog-related {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--blog-border);
}

.blog-related h2 {
  font-size: 1.15rem;
  margin-top: 0;
}

.blog-related ul {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
}

.blog-related li {
  margin-bottom: 0.5rem;
}

.blog-related a {
  color: var(--blog-accent);
  text-decoration: none;
  font-weight: 500;
}

.blog-related a:hover {
  text-decoration: underline;
}

.blog-cta {
  margin: 2rem 0;
  padding: 1.5rem;
  background: linear-gradient(135deg, #f0f4ff 0%, #fafafa 100%);
  border: 1px solid var(--blog-border);
  border-radius: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.blog-cta p {
  margin: 0;
  font-weight: 600;
  max-width: 420px;
}

.blog-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-cta {
  display: inline-block;
  padding: 0.65rem 1.15rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.btn-cta-primary {
  background: var(--blog-accent);
  color: #fff;
}

.btn-cta-primary:hover {
  background: var(--blog-accent-hover);
  color: #fff;
}

.btn-cta-secondary {
  background: #fff;
  color: var(--blog-accent);
  border: 2px solid var(--blog-accent);
}

.btn-cta-secondary:hover {
  background: var(--blog-accent);
  color: #fff;
}

.blog-footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--blog-border);
  text-align: center;
  color: var(--blog-muted);
  font-size: 0.88rem;
}

.blog-footer a {
  color: var(--blog-accent);
}

/* Blog index */
.blog-index-hero {
  padding: 2.5rem 1.25rem 1rem;
  max-width: 960px;
  margin: 0 auto;
}

.blog-index-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.1rem);
  margin: 0 0 0.5rem;
}

.blog-index-hero p {
  color: var(--blog-muted);
  margin: 0;
}

.blog-clusters {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.blog-cluster {
  margin-bottom: 2.5rem;
}

.blog-cluster h2 {
  font-size: 1.2rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--blog-accent);
  display: inline-block;
}

.blog-cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .blog-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

.blog-card {
  border: 1px solid var(--blog-border);
  border-radius: 10px;
  padding: 1.15rem 1.25rem;
  transition: box-shadow 0.2s, border-color 0.2s;
  background: #fff;
}

.blog-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  border-color: #c8d4ff;
}

.blog-card.pillar {
  border-left: 4px solid var(--blog-accent);
}

.blog-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.blog-card h3 a {
  color: inherit;
  text-decoration: none;
}

.blog-card h3 a:hover {
  color: var(--blog-accent);
}

.blog-card .excerpt {
  font-size: 0.92rem;
  color: var(--blog-muted);
  margin: 0;
}

.blog-tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blog-accent);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

code {
  font-family: ui-monospace, 'Cascadia Code', 'Segoe UI Mono', monospace;
  font-size: 0.88em;
  background: var(--blog-code-bg);
  padding: 0.12em 0.35em;
  border-radius: 4px;
}