:root {
  --bg: #0d1117;
  --fg: #e6edf3;
  --muted: #9da7b3;
  --accent: #2f81f7;
  --card: #161b22;
  --border: #30363d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(8px);
}
.site-header nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; font-size: 1.1rem; }
.site-header ul { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
.site-header a { color: var(--muted); text-decoration: none; }
.site-header a:hover { color: var(--fg); }
main { max-width: 820px; margin: 0 auto; padding: 2.5rem 1.5rem; }
.hero { text-align: center; padding: 2rem 0 3rem; }
.hero h1 { font-size: 2.6rem; margin: 0 0 0.5rem; }
.tagline { color: var(--accent); font-weight: 600; margin: 0 0 1rem; }
.intro { color: var(--muted); font-size: 1.1rem; }
.cta { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.5rem; }
.btn {
  background: var(--accent); color: #fff; padding: 0.6rem 1.1rem;
  border-radius: 8px; text-decoration: none; font-weight: 600;
}
.btn.ghost { background: transparent; border: 1px solid var(--border); color: var(--fg); }
h2 { margin-top: 2.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; }
.skills { list-style: none; padding: 0; }
.skills li { background: var(--card); border: 1px solid var(--border); padding: 0.6rem 0.9rem; border-radius: 8px; margin-bottom: 0.5rem; }
details { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; margin-bottom: 0.6rem; }
summary { cursor: pointer; font-weight: 600; }
.prose p, .prose li { color: var(--fg); }
.byline { color: var(--muted); font-size: 0.95rem; }
pre { background: #010409; border: 1px solid var(--border); border-radius: 8px; padding: 1rem; overflow-x: auto; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: #79c0ff; }
.post-list { list-style: none; padding: 0; }
.post-list li { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; margin-bottom: 0.8rem; }
.post-list a { color: var(--accent); font-weight: 700; font-size: 1.1rem; text-decoration: none; }
.post-list p { color: var(--muted); margin: 0.4rem 0 0; }
footer { border-top: 1px solid var(--border); text-align: center; color: var(--muted); padding: 1.5rem; font-size: 0.9rem; }
a { color: var(--accent); }