:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --panel-strong: #eef2ff;
  --text: #0b1220;
  --muted: #4a5568;
  --accent: #1f7cff;
  --accent-2: #14cba8;
  --border: rgba(15, 23, 42, 0.08);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #050c15;
    --panel: rgba(255,255,255,0.04);
    --panel-strong: rgba(255,255,255,0.08);
    --text: #eef6ff;
    --muted: rgba(238,246,255,0.7);
    --accent: #64f4cb;
    --accent-2: #6f7dff;
    --border: rgba(255,255,255,0.12);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body.blog-shell {
  margin: 0;
  background: var(--bg);
  font-family: 'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  min-height: 100vh;
}
.blog-shell, .blog-shell * {
  color-scheme: inherit;
}
.blog-header {
  padding: 2.5rem clamp(1.5rem, 4vw, 4rem) 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.blog-brand a {
  text-decoration: none;
  color: inherit;
}
.blog-brand__eyebrow {
  display: block;
  letter-spacing: 0.25em;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--muted);
}
.blog-brand__title {
  font-family: 'Space Grotesk', 'DM Sans', sans-serif;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}
.blog-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  margin-left: 1.5rem;
  position: relative;
}
.blog-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity 0.2s ease;
}
.blog-nav a:hover::after,
.blog-nav a:focus-visible::after { opacity: 1; }
.blog-main {
  padding: 0 clamp(1.5rem, 4vw, 4rem) 4rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}
.feature {
  background: var(--panel);
  border-radius: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--border);
  min-height: 520px;
}
.feature__link {
  display: grid;
  grid-template-rows: 320px 1fr;
  height: 100%;
  color: inherit;
  text-decoration: none;
}
.feature__media {
  background-size: cover;
  background-position: center;
}
.feature__body {
  padding: 2rem;
}
.eyebrow {
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--muted);
}
.feature__body h1 {
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  font-size: 2rem;
}
.feature__body p {
  color: var(--muted);
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.card {
  border-radius: 1rem;
  border: 1px solid var(--border);
  background: var(--panel);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card a {
  display: block;
  padding: 1.5rem;
  color: inherit;
  text-decoration: none;
}
.card__meta {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  color: var(--muted);
  font-size: 0.85rem;
}
.card:hover,
.card:focus-within {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card h2 {
  margin: 0.25rem 0 0.5rem;
}
.card p {
  margin: 0;
  color: var(--muted);
}
.card__author {
  margin-top: 0.35rem;
  font-size: 0.9rem;
}
.tag-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag-list li {
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}
.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.pill--pdf {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #050c15;
}
.pill--outline {
  border: 1px solid var(--border);
  color: var(--muted);
}
.article-shell {
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: var(--panel);
  overflow: hidden;
}
.article-hero {
  padding: clamp(1.5rem, 5vw, 4rem);
}
.article-hero__media {
  border-radius: 1rem;
  margin-top: 2rem;
  height: clamp(180px, 32vw, 300px);
  background-size: cover;
  background-position: center;
}
.article-body {
  padding: clamp(1.5rem, 5vw, 4rem);
  border-top: 1px solid var(--border);
  line-height: 1.75;
  color: var(--muted);
}
.article-body h2 {
  color: var(--text);
}
.article-body img,
.article-body video {
  max-width: 100%;
  border-radius: 1rem;
  border: 1px solid var(--border);
}
.article-body pre {
  background: #eef2ff;
  padding: 1rem;
  border-radius: 0.75rem;
  overflow-x: auto;
}
@media (prefers-color-scheme: dark) {
  .article-body pre {
    background: #0c1623;
  }
}
.article-abstract {
  margin: 1rem 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel-strong);
  color: var(--muted);
}
.article-abstract h3 {
  margin: 0 0 0.35rem;
  color: var(--text);
}
.rich-block {
  margin-bottom: 2.5rem;
}
.rich-block h2,
.rich-block h3 {
  margin-top: 0;
  color: var(--text);
}
.rich-grid {
  margin-bottom: 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  align-items: start;
}
.rich-highlight {
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.08));
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #050c15;
  text-decoration: none;
  font-weight: 600;
}
.empty {
  text-align: center;
  padding: 4rem 1rem;
  background: var(--panel);
  border-radius: 1.5rem;
  border: 1px dashed var(--border);
}
.pdf-viewer {
  padding: clamp(1.5rem, 5vw, 4rem);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.pdf-viewer--tight {
  padding: 1rem 0 1.5rem;
  border-top: none;
}
.pdf-viewer__frame {
  background: #0c1623;
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
}
.pdf-viewer__frame {
  background: #f5f7fb;
}
@media (prefers-color-scheme: dark) {
  .pdf-viewer__frame {
    background: #0c1623;
    border-color: rgba(255,255,255,0.12);
  }
}
.pdf-viewer__frame iframe {
  width: 100%;
  height: clamp(360px, 60vw, 720px);
  border: none;
  border-radius: 0.75rem;
  background: #fff;
}
.pdf-viewer__fallback {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.pdf-viewer__fallback a {
  color: var(--accent);
}
.pdf-viewer__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}
.ghost-link {
  color: var(--text);
  text-decoration: none;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.blog-footer {
  padding: 3rem clamp(1.5rem, 4vw, 4rem);
  border-top: 1px solid var(--border);
  color: var(--text);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
}
.blog-footer a {
  color: inherit;
  text-decoration: none;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.skip-link {
  position: absolute;
  left: -1000px;
  background: var(--text);
  color: #050c15;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}
@media (max-width: 768px) {
  .blog-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .blog-nav a {
    margin-left: 0;
    margin-right: 1rem;
  }
  .feature__link {
    grid-template-rows: 220px 1fr;
  }
}