:root {
  --bg: #0b0f14;
  --surface: #121821;
  --surface-2: #18202b;
  --border: #243040;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #3ddc97;
  --accent-2: #5cc8ff;
  --accent-ink: #06130d;
  --radius: 14px;
  --maxw: 1080px;
  --prose: 720px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f9fb;
    --surface: #ffffff;
    --surface-2: #eef2f6;
    --border: #d9e0e7;
    --text: #0f1720;
    --muted: #55626f;
    --accent: #0a8f5a;
    --accent-2: #0b6fa8;
    --accent-ink: #ffffff;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex; flex-direction: column; min-height: 100vh;
}
main { flex: 1; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 700; }
.accent { color: var(--accent); }
.eyebrow, .brand, .stat-value, .chip, .dot, .filter, .back, code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* header & footer */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { font-weight: 600; font-size: 1.1rem; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-null { color: var(--muted); }
.brand-arrow { color: var(--accent-2); margin: 0 2px; }
.brand-value { color: var(--accent); }
nav { display: flex; gap: 4px; }
nav a { color: var(--muted); padding: 6px 12px; border-radius: 8px; font-size: .95rem; }
nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.site-footer { border-top: 1px solid var(--border); margin-top: 64px; padding: 24px 0; color: var(--muted); font-size: .9rem; }
.site-footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.site-footer p { margin: 0; }

/* hero */
.hero { padding: 72px 20px 32px; }
.eyebrow { color: var(--accent-2); font-size: .9rem; margin: 0 0 12px; }
.lede { color: var(--muted); font-size: 1.15rem; max-width: 680px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600;
  background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent);
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }

/* sections & cards */
.section { padding-top: 40px; }
.section-title { font-size: 1rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; display: flex; flex-direction: column; transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { font-size: 1.2rem; margin: 10px 0 8px; }
.card h3 a { color: var(--text); }
.card p { color: var(--muted); margin: 0 0 16px; font-size: .97rem; }
.read-more { margin-top: auto; font-weight: 600; font-size: .95rem; }
.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chip {
  font-size: .75rem; padding: 3px 9px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent);
}
a.chip:hover { text-decoration: none; background: color-mix(in srgb, var(--accent) 24%, transparent); }
.dot { font-size: .8rem; color: var(--muted); }
.empty { color: var(--muted); }

.topics { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.topic {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px; color: var(--text); font-weight: 600;
}
.topic:hover { border-color: var(--accent-2); text-decoration: none; }
.topic small { color: var(--muted); font-weight: 400; white-space: nowrap; margin-left: 8px; }

/* blog list */
.page-head { padding-top: 56px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.filter {
  font-size: .85rem; padding: 7px 14px; border-radius: 999px; cursor: pointer;
  background: var(--surface); color: var(--muted); border: 1px solid var(--border);
}
.filter:hover { color: var(--text); }
.filter[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* post */
.post { max-width: calc(var(--prose) + 40px); padding-top: 40px; }
.back { display: inline-block; font-size: .85rem; margin-bottom: 24px; color: var(--muted); }
.post h1 { margin-top: 16px; font-size: clamp(1.9rem, 4.5vw, 2.6rem); }
.prose { font-size: 1.08rem; }
.prose h2 { font-size: 1.55rem; margin-top: 2em; }
.prose h3 { font-size: 1.2rem; margin-top: 1.6em; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.2em; }
.prose strong { color: var(--text); font-weight: 600; }
.prose img { max-width: 100%; border-radius: 10px; }
.prose code { background: var(--surface-2); padding: 2px 6px; border-radius: 6px; font-size: .9em; }
.prose pre { background: var(--surface); border: 1px solid var(--border); padding: 16px; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { margin: 1.5em 0; padding-left: 18px; border-left: 3px solid var(--accent-2); color: var(--muted); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: .95rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.callout {
  margin: 2em 0; padding: 20px 22px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent);
}
.callout-title { font-family: "JetBrains Mono", monospace; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin: 0 0 8px !important; }
.callout p:last-child { margin-bottom: 0; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin: 2em 0; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; text-align: center; }
.stat-value { display: block; font-size: 1.9rem; font-weight: 600; color: var(--accent); }
.stat-label { display: block; font-size: .85rem; color: var(--muted); margin-top: 4px; }
.post-end {
  margin-top: 56px; padding: 28px; border-radius: var(--radius); text-align: center;
  background: var(--surface); border: 1px solid var(--border);
}
.post-end h2 { font-size: 1.3rem; }
.post-end p { color: var(--muted); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.pager a { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; color: var(--text); font-weight: 600; }
.pager a small { display: block; color: var(--muted); font-weight: 400; }
.pager .next { text-align: right; grid-column: 2; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding-top: 48px; }
  nav a { padding: 6px 8px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}

/* photo, LinkedIn, author box */
.icon { width: 18px; height: 18px; flex: none; }
.btn-icon { display: inline-flex; align-items: center; gap: 8px; }
.nav-icon { display: inline-flex; align-items: center; }
.avatar { display: block; border-radius: 50%; object-fit: cover; flex: none; border: 2px solid var(--border); }
.avatar-initials {
  display: flex; align-items: center; justify-content: center; font-weight: 700;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 30%, var(--surface)), color-mix(in srgb, var(--accent-2) 30%, var(--surface)));
  color: var(--text); font-family: "JetBrains Mono", monospace;
}
.avatar-lg { width: 220px; height: 220px; font-size: 64px; }
.avatar-md { width: 72px; height: 72px; font-size: 24px; }
.hero { display: flex; align-items: center; gap: 48px; }
.hero-text { flex: 1; min-width: 0; }
.hero-photo .avatar { box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 18%, transparent); }
.about-head { display: flex; align-items: center; gap: 32px; margin-bottom: 32px; flex-wrap: wrap; }
.about-head h1 { margin-bottom: 4px; }
.about-head .lede { margin: 0 0 16px; }
.author-box {
  display: flex; gap: 18px; align-items: center; margin-top: 56px; padding: 22px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.author-box p { margin: 0; }
.author-name { font-weight: 700; }
.author-bio { color: var(--muted); font-size: .95rem; margin: 4px 0 6px !important; }
.author-links { font-size: .9rem; }
.author-box + .post-end { margin-top: 24px; }
@media (max-width: 760px) {
  .hero { flex-direction: column-reverse; align-items: flex-start; gap: 24px; }
  .avatar-lg { width: 120px; height: 120px; font-size: 36px; }
}