html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem;
}

.site-nav {
  border-bottom: 1px solid #ccc;
  padding: 1rem;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.site-footer {
  border-top: 1px solid #ccc;
  padding: 1rem;
  margin-top: 2rem;
}

.site-footer p {
  max-width: 720px;
  margin: 0 auto;
}

.scope-list {
  padding: 1rem 1rem 1rem 2rem;
  border: 1px solid #ccc;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  margin-bottom: 0.25rem;
}

.field select,
.field input {
  width: 100%;
  padding: 0.5rem;
}

.field-help {
  margin-top: 0.25rem;
  font-size: 0.875rem;
}

.hidden {
  display: none;
}

.figure-pair { display: flex; flex-wrap: wrap; gap: 1rem; }
.figure-pair figure { flex: 1 1 260px; margin: 0; }
.figure-pair img { width: 100%; height: auto; border: 1px solid #ccc; }
.figure-pair figcaption { margin-top: 0.5rem; font-size: 0.9rem; }