:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --fg: #0f172a;
  --fg-muted: #55607a;
  --border: #e4e7ee;
  --accent: #2b5bd7;
  --accent-fg: #ffffff;
  --radius: 10px;
  --maxw: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f19;
    --bg-alt: #111827;
    --fg: #e6e8ef;
    --fg-muted: #9aa3b8;
    --border: #1f2738;
    --accent: #7aa2ff;
    --accent-fg: #0b0f19;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.container.narrow { max-width: 42rem; }

code {
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  padding: 0.12em 0.35em;
  border-radius: 5px;
  font-size: 0.92em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

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

a:hover { text-decoration: underline; }

/* ── Header / nav ──────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(6px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.75rem;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  color: var(--fg);
  font-size: 1.05rem;
}

.logo:hover { text-decoration: none; }

.logo-mark {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #9bb5ff);
  display: inline-block;
}

.nav nav {
  display: flex;
  gap: 1.25rem;
}

.nav nav a {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.nav nav a:hover { color: var(--fg); text-decoration: none; }

/* ── Hero ──────────────────────────────────────────────── */
.hero {
  padding: 5rem 0 4rem;
  text-align: left;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.015em;
  max-width: 36ch;
}

.hero .lede {
  font-size: 1.1rem;
  color: var(--fg-muted);
  max-width: 56ch;
  margin: 0 0 1.75rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.625rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background-color 0.15s, transform 0.06s;
}

.btn:hover { text-decoration: none; background: var(--bg-alt); }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 85%, #000);
}

/* ── Sections ──────────────────────────────────────────── */
.section {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.75rem);
  margin: 0 0 1.75rem;
  letter-spacing: -0.01em;
}

/* ── Feature grid ──────────────────────────────────────── */
.grid-3 {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--fg-muted);
}

/* ── Stack description list ────────────────────────────── */
.stack-list {
  display: grid;
  gap: 0.9rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  margin: 0;
}

.stack-list > div {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
}

.stack-list dt {
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin-bottom: 0.2rem;
}

.stack-list dd {
  margin: 0;
  color: var(--fg);
}

/* ── Footer ────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 2rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-inner .meta a { color: var(--fg-muted); }
.footer-inner p { margin: 0; }