:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1d21;
  --muted: #5b626b;
  --border: #e2e5e9;
  --card-bg: #f8f9fa;
  --accent: #1a3a5f;
  --accent-soft: #eef3f8;
  --caveat-bg: #fff8e6;
  --caveat-border: #e0c36a;
  --callout-bg: #f2f5f7;
  --max-width: 72ch;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --fg: #e8eaed;
    --muted: #a8adb4;
    --border: #2a2f36;
    --card-bg: #171b20;
    --accent: #9cc0e6;
    --accent-soft: #18222e;
    --caveat-bg: #26200f;
    --caveat-border: #8a7326;
    --callout-bg: #171b20;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 1.05rem;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--fg);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.12em;
  text-decoration: none;
  color: var(--fg);
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.nav-list a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--fg);
  text-decoration: underline;
}

main section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

main section:last-child {
  border-bottom: none;
}

.hero {
  padding: 4.5rem 0 3.5rem;
}

.badge {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  margin: 0 0 1.25rem;
  background: var(--accent-soft);
  color: var(--fg);
}

.brand-kicker {
  font-weight: 800;
  letter-spacing: 0.18em;
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.2;
  margin: 0 0 1.25rem;
  max-width: 22ch;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin: 0 0 1rem;
  letter-spacing: -0.005em;
}

.lede {
  font-size: 1.2rem;
  max-width: 60ch;
}

.lede-secondary {
  max-width: 62ch;
  color: var(--muted);
}

.hero-note {
  font-size: 0.95rem;
  color: var(--muted);
}

.clean-list {
  padding-left: 1.25rem;
  max-width: 62ch;
}

.clean-list li {
  margin-bottom: 0.35rem;
}

.steps {
  padding-left: 1.5rem;
  max-width: 64ch;
}

.steps li {
  margin-bottom: 0.6rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.metric-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  padding: 1rem 1.1rem;
}

.metric-label {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.metric-value {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.caveat {
  border: 1px solid var(--caveat-border);
  background: var(--caveat-bg);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  max-width: 70ch;
}

.callout {
  border-left: 3px solid var(--border);
  background: var(--callout-bg);
  padding: 0.8rem 1rem;
  border-radius: 0 8px 8px 0;
  max-width: 70ch;
}

a {
  color: inherit;
  text-underline-offset: 0.15em;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95em;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.35em;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer .legal {
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

@media (max-width: 600px) {
  body {
    font-size: 1rem;
  }

  main section {
    padding: 2.25rem 0;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}