:root {
  color-scheme: dark;
  --background: #070b1a;
  --surface: #12182b;
  --border: #283149;
  --text: #f7f8fc;
  --muted: #b7bfd2;
  --accent: #54d7ef;
  --accent-secondary: #7658ff;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 85% 0%, rgba(118, 88, 255, 0.24), transparent 34rem),
    var(--background);
}

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

a:hover {
  text-decoration-thickness: 2px;
}

.shell {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 750;
  text-decoration: none;
}

.mark {
  color: var(--accent);
  font-size: 1.45rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--text);
}

main {
  display: block;
}

h1,
h2 {
  line-height: 1.18;
  letter-spacing: -0.025em;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2.25rem, 8vw, 4rem);
}

h2 {
  margin: 2.25rem 0 0.65rem;
  font-size: 1.3rem;
}

p,
li {
  color: var(--muted);
}

.lede {
  max-width: 42rem;
  margin: 0 0 2rem;
  font-size: 1.08rem;
}

.updated {
  display: inline-block;
  margin-bottom: 2rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
}

.card {
  margin: 1rem 0;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: rgba(18, 24, 43, 0.82);
}

.card h2 {
  margin-top: 0;
}

.notice {
  border-left: 3px solid var(--accent-secondary);
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 0.45rem;
}

strong {
  color: var(--text);
}

address {
  color: var(--muted);
  font-style: normal;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  header {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 2.5rem;
  }
}