:root {
  --fg: #1f2328;
  --muted: #57606a;
  --bg: #f6f8fa;
  --card: #ffffff;
  --border: #d0d7de;
  --accent: #0969da;
  --accent-fg: #ffffff;
  --notice-bg: #dafbe1;
  --notice-border: #2da44e;
  --notice-heading: #116329;
  --code-bg: #f0f3f6;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 2rem 1rem 3rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
}

header {
  margin-bottom: 1.5rem;
  text-align: left;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
  letter-spacing: -0.01em;
  line-height: 1;
}

.logo {
  display: block;
  max-width: 280px;
  width: 100%;
  height: auto;
}

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

h2 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-size: 1.3rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.25rem;
}

h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.05rem;
}

p { margin: 0.6rem 0; }

a {
  color: var(--accent);
  text-decoration: underline;
}

a:hover { text-decoration: none; }

a:focus-visible,
.button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

.notice {
  background: var(--notice-bg);
  border-color: var(--notice-border);
  border-left-width: 4px;
}

.notice h2 {
  color: var(--notice-heading);
  border-bottom-color: var(--notice-border);
}

.notice .options {
  margin: 0.5rem 0 0.25rem;
  padding-left: 1.25rem;
}

.notice .options li { margin: 0.2rem 0; }

.cta-row {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.55rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.button:hover { background: #0550ae; }

.secondary { font-weight: 500; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 0.9rem;
  overflow-x: auto;
  margin: 0.5rem 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo,
               Consolas, "Liberation Mono", monospace;
  font-size: 0.92rem;
}

pre code { display: block; white-space: pre; }

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

ul.links {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

ul.links li { margin: 0.15rem 0; }

.citation {
  font-size: 0.95rem;
}

footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  body { padding: 1.25rem 0.75rem 2rem; }
  h1 { font-size: 1.6rem; }
  .logo { max-width: 220px; }
  section { padding: 0.85rem 0.9rem; }
  .cta-row { flex-direction: column; align-items: flex-start; }
  .button { width: 100%; text-align: center; }
}