:root {
  color-scheme: light;
  --ink: #1a1a1a;
  --muted: #4a4a4a;
  --bg: #ffffff;
  --band: #f4f3f8;
  --accent: #2d2a6e;
  --accent-contrast: #ffffff;
  --border: #d6d3e6;
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
}

.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

/* Visible only when focused -- lets keyboard/screen-reader users jump past the
   header and nav straight to the content. */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.75rem 1rem;
  z-index: 100;
}

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

header {
  background: var(--accent);
  color: var(--accent-contrast);
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
}

header .tagline {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

header .byline {
  margin: 0;
  font-size: 0.95rem;
  opacity: 0.9;
}

header a {
  color: var(--accent-contrast);
}

nav {
  background: var(--band);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  margin: 0;
  padding: 0;
}

nav a {
  display: inline-block;
  padding: 0.6rem 0.25rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
}

nav a:hover,
nav a:focus {
  text-decoration: underline;
}

main section {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

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

h2 {
  font-size: 1.5rem;
  margin-top: 0;
}

h3 {
  font-size: 1.15rem;
  color: var(--accent);
}

.added-at {
  font-size: 0.9rem;
  color: var(--muted);
  font-style: italic;
  margin-top: -0.5rem;
}

.future-milestone-banner {
  background: var(--band);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin: 0 0 1.25rem;
}

dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.5rem 1rem;
}

dt {
  font-weight: 600;
}

dd {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

caption {
  text-align: left;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--band);
}

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

a {
  color: var(--accent);
}

footer {
  background: var(--band);
  border-top: 1px solid var(--border);
}

footer p {
  margin: 0.25rem 0;
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 600px) {
  header h1 {
    font-size: 1.5rem;
  }
}