:root {
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-card: #141414;
  --border: #222222;
  --border-subtle: #1a1a1a;
  --text: #e8e8e8;
  --text-secondary: #888888;
  --text-muted: #555555;
  --accent: #3dff8a;
  --accent-dim: rgba(61, 255, 138, 0.12);
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-sans: "Inter", system-ui, sans-serif;
  --max-width: 720px;
  --page-width: 1080px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent); text-decoration: none; }

.page-header {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 4rem 2rem 2rem;
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.page-header .lead {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 52ch;
}

.article-layout,
.blog-layout {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.article-main {
  max-width: var(--max-width);
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.article-meta .tag {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.article-body h2 {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 1rem;
  color: var(--text);
}

.article-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.article-body p,
.article-body li {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.article-body ul,
.article-body ol {
  padding-left: 1.35rem;
  margin-bottom: 1.25rem;
}

.article-body li { margin-bottom: 0.5rem; }

.article-body strong { color: var(--text); font-weight: 600; }

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 1.75rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-card);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent);
}

.article-body pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.callout {
  background: var(--accent-dim);
  border: 1px solid rgba(61, 255, 138, 0.2);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
}

.callout p:last-child { margin-bottom: 0; }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  max-width: var(--page-width);
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.blog-card:hover {
  border-color: rgba(61, 255, 138, 0.35);
  text-decoration: none;
}

.blog-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.blog-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.blog-card-meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.related-posts {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.related-posts h2 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.related-list {
  list-style: none;
  padding: 0;
}

.related-list li {
  margin-bottom: 0.65rem;
}

.related-list a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem;
  border-top: 1px solid var(--border-subtle);
  max-width: var(--page-width);
  margin: 0 auto;
}

.footer-left,
.footer-right {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

@media (max-width: 640px) {
  .nav { padding: 1rem 1.25rem; }
  .nav-links { gap: 1rem; }
  .page-header, .article-layout, .blog-layout { padding-left: 1.25rem; padding-right: 1.25rem; }
}