:root {
  --text-strong: #2b3138;
  --text-body: #495057;
  --text-muted: #5f676f;
  --text-link: #146fd7;
  --surface-card: #ffffff;
  --border-subtle: #e4e7ec;
  --border-focus: #4a8ee2;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--surface-card);
  color: var(--text-body);
  overflow-wrap: break-word;
}

a {
  color: var(--text-link);
}

a:focus-visible {
  outline: 0.125rem solid var(--border-focus);
  outline-offset: 0.125rem;
}

.site-header,
main,
.site-footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.brand {
  color: var(--text-strong);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
}

h1,
h2,
h3 {
  color: var(--text-strong);
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 1.5rem 0 1rem;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.3;
  margin: 2rem 0 0.5rem;
}

h3 {
  font-size: 1.0625rem;
  margin: 1.5rem 0 0.5rem;
}

p,
ul {
  margin: 0 0 0.75rem;
}

li {
  margin-bottom: 0.375rem;
}

.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
  padding: 0;
}