:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-grid: #11161d;
  --fg: #d6dde6;
  --fg-strong: #f0f4f8;
  --fg-dim: #8b95a1;
  --accent: #5dafec;
  --accent-dim: #3d8fc4;
  --border: #1f242c;
  --border-strong: #2a313b;
  --max: 64rem;
  --max-prose: 42rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease, color 120ms ease;
}
a:hover { border-bottom-color: var(--accent-dim); }

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: saturate(180%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.95rem;
  padding-bottom: 0.95rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--fg-strong);
  border-bottom: none;
  font-weight: 600;
  letter-spacing: 0.005em;
}
.brand:hover { color: var(--fg-strong); border-bottom: none; }
.brand-mark {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.92rem;
  padding: 0.18rem 0.45rem;
  border: 1px solid var(--accent-dim);
  border-radius: 3px;
  line-height: 1;
}
.brand-name { letter-spacing: 0.01em; }
.nav-main {
  display: flex;
  gap: 1.5rem;
}
.nav-main a {
  color: var(--fg-dim);
  font-size: 0.95rem;
  border-bottom: none;
}
.nav-main a:hover, .nav-main a.active {
  color: var(--fg-strong);
}

/* ---------- Hero ---------- */
.hero {
  padding: 5.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(93, 175, 236, 0.10), transparent 60%),
    linear-gradient(to bottom, var(--bg-grid), var(--bg));
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin: 0 0 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.12;
  margin: 0 0 1.5rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--fg-strong);
}
.lead {
  font-size: 1.18rem;
  color: var(--fg-dim);
  max-width: var(--max-prose);
  margin: 0;
  line-height: 1.6;
}
.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.btn {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid transparent;
  border-bottom: 1px solid transparent;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.btn-primary {
  background: var(--accent);
  color: #07121c;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: #7ec0f0;
  border-color: #7ec0f0;
  color: #07121c;
}
.btn-ghost {
  color: var(--fg);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  color: var(--fg-strong);
  border-color: var(--accent-dim);
}

/* ---------- Prose / sections ---------- */
.prose {
  padding: 3rem 0;
  max-width: var(--max-prose);
}
.prose h2 {
  margin-top: 2.75rem;
  margin-bottom: 0.75rem;
  font-size: 1.45rem;
  letter-spacing: -0.005em;
  color: var(--fg-strong);
  font-weight: 600;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  margin-top: 2rem;
  font-size: 1.1rem;
  color: var(--fg-strong);
  font-weight: 600;
}
.prose p, .prose ul, .prose ol {
  margin: 1rem 0;
}
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li { margin: 0.4rem 0; }
.prose blockquote {
  margin: 2rem 0;
  padding: 0.85rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  color: var(--fg-strong);
  font-style: italic;
}
.prose blockquote p { margin: 0; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1rem 0.35rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 3px;
}
.prose pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.prose pre code {
  background: transparent;
  border: none;
  padding: 0;
}
.prose strong { color: var(--fg-strong); font-weight: 600; }
.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ---------- Single page ---------- */
.page {
  padding: 4rem 0 5rem;
}
.page h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  margin: 0 0 1rem;
  letter-spacing: -0.005em;
  color: var(--fg-strong);
  font-weight: 700;
}
.page > .container > .lead {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

/* ---------- List page ---------- */
.page-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}
.page-list li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.page-list-desc {
  display: block;
  color: var(--fg-dim);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.25rem 0;
  color: var(--fg-dim);
  font-size: 0.9rem;
  margin-top: 4rem;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--fg-dim);
}
.footer-meta { margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .nav-main { gap: 1rem; }
  .brand-name { display: none; }
  .hero { padding: 4rem 0 2.5rem; }
}