:root {
  --ink: #14212b;
  --ink-soft: #46586a;
  --paper: #ffffff;
  --paper-soft: #f2f5f7;
  --line: #d5dde3;
  --accent: #0e5a6e;
  --accent-ink: #ffffff;
  --focus: #1f7aa3;
  color-scheme: light dark;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7eef2;
    --ink-soft: #a9b8c3;
    --paper: #0f171d;
    --paper-soft: #172530;
    --line: #2b3b47;
    --accent: #5cc3d9;
    --accent-ink: #0f171d;
    --focus: #8fd6e6;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

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

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 16px;
  padding: 8px 12px;
  background: var(--paper);
}

.masthead,
.footer,
main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  padding-bottom: 24px;
}

.wordmark {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  font-weight: 700;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
}

.masthead nav {
  display: flex;
  gap: 20px;
}

.masthead nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.masthead nav a[aria-current='page'] {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 6px;
}

.footer {
  margin-top: 96px;
  padding-top: 24px;
  padding-bottom: 48px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 15px;
}

.notice {
  max-width: 560px;
  margin: 96px auto;
}

h1 {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.1;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 24px;
  margin: 48px 0 12px;
}

h3 {
  font-size: 19px;
  margin: 28px 0 8px;
}

p,
li {
  max-width: 68ch;
}

.hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  max-width: 18ch;
}

.lead {
  font-size: 20px;
  color: var(--ink-soft);
  max-width: 60ch;
}

.button {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 20px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
}

.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px 56px;
  padding: 48px 0;
}

@media (min-width: 720px) {
  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.feature h2 {
  margin: 0 0 8px;
  font-size: 19px;
}

.feature p {
  margin: 0;
  color: var(--ink-soft);
}

.next {
  padding: 32px;
  background: var(--paper-soft);
  border-radius: 8px;
}

.next p {
  margin: 0;
}

.prose {
  padding: 48px 0;
}

.prose .updated {
  color: var(--ink-soft);
  font-size: 15px;
}

.prose li {
  margin-bottom: 8px;
}

.status {
  margin: 0 0 20px;
  color: var(--ink-soft);
}

.status strong {
  color: var(--ink);
}

.conditions {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 15px;
}

.conditions li {
  margin-bottom: 6px;
}