:root {
  --bg: #ffffff;
  --bg-soft: #f4f5f7;
  --fg: #16181d;
  --fg-muted: #4c5158;
  --accent: #0a5ad6;
  --accent-fg: #ffffff;
  --border: #d5d8dd;
  --code-bg: #f0f1f4;
  --radius: 10px;
  --measure: 72ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d10;
    --bg-soft: #14171c;
    --fg: #eef0f3;
    --fg-muted: #b3b9c2;
    --accent: #74a9ff;
    --accent-fg: #0b0d10;
    --border: #2a2f37;
    --code-bg: #171b21;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration: none; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg);
  color: var(--fg);
  padding: 0.75rem 1rem;
  z-index: 10;
}
.skip-link:focus {
  left: 0;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.site-header nav {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 650;
  color: var(--fg);
  text-decoration: none;
  min-height: 44px;
}
.brand img { border-radius: 6px; }

.site-header ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  margin: 0;
  padding: 0;
}
.site-header ul a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.25rem;
  color: var(--fg-muted);
  text-decoration: none;
}
.site-header ul a:hover { color: var(--accent); text-decoration: underline; }

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1rem;
}

section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}
section:last-of-type { border-bottom: 0; }

h1 {
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
h2 {
  font-size: clamp(1.4rem, 4vw, 1.75rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}
h3 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.5rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 60ch;
}

.meta {
  color: var(--fg-muted);
  font-size: 0.9375rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 200ms ease, color 200ms ease;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:hover { background: transparent; color: var(--accent); }
.btn-secondary {
  background: transparent;
  color: var(--accent);
}
.btn-secondary:hover { background: var(--bg-soft); }

figure {
  margin: 1.5rem 0;
}
figure img {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  width: 100%;
}
figcaption {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  margin-top: 0.5rem;
}

ul.plain { list-style: none; padding-left: 0; }
ul.plain li { margin-bottom: 0.4rem; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}
:not(pre) > code {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

.step {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem 1rem;
  margin: 1.25rem 0;
  background: var(--bg-soft);
}
.step h3 { margin-top: 1rem; }

#faq h3 { margin-top: 1.75rem; }
#faq p { margin-top: 0.35rem; }

.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  color: var(--fg-muted);
  font-size: 0.9375rem;
  border-top: 1px solid var(--border);
}