:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --bg: #ffffff;
  --accent: #5C57D6;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #f5f5f7; --muted: #9a9a9a; --bg: #0d0d0d; --accent: #8B86F0; }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

body {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

header {
  margin-bottom: 32px;
}

h1 {
  font-size: 2.4rem;
  letter-spacing: -0.02em;
  margin: 0 0 4px;
}

h2 {
  font-size: 1.35rem;
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.05rem;
  margin: 24px 0 6px;
}

p, li {
  color: var(--fg);
}

.tagline {
  color: var(--muted);
  margin: 0;
  font-size: 1.05rem;
}

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

nav {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}

ul {
  padding-left: 1.4em;
}

li {
  margin-bottom: 6px;
}

section {
  margin-bottom: 12px;
}

footer {
  margin-top: 56px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid color-mix(in srgb, var(--fg) 12%, transparent);
  padding-top: 16px;
}

em { color: var(--muted); }