:root {
  color-scheme: light dark;
  --background: #f4f8fb;
  --surface: #ffffff;
  --text: #10263b;
  --secondary: #4b6479;
  --line: #d7e2ea;
  --accent: #1f72e5;
  --focus: #0a8f62;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #061421;
    --surface: #0d2132;
    --text: #edf6fc;
    --secondary: #abc0d0;
    --line: #294156;
    --accent: #5da4ff;
    --focus: #36d496;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 10;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--text);
  color: var(--background);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform 120ms ease;
}
.skip-link:focus { transform: translateY(0); }

header,
main,
footer {
  width: min(100% - 32px, 760px);
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: 24px 18px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 750;
  text-decoration: none;
}

nav { display: flex; flex-wrap: wrap; gap: 16px; }
nav a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 650; }

main { padding-block: 34px 48px; }

h1,
h2 { line-height: 1.2; }
h1 { margin: 0 0 12px; font-size: clamp(2rem, 8vw, 3.2rem); }
h2 { margin: 34px 0 10px; font-size: 1.25rem; }
p, ul { margin-block: 10px; }
ul { padding-left: 24px; }

.summary {
  color: var(--secondary);
  font-size: 1.08rem;
  max-width: 62ch;
}

.notice {
  margin-top: 28px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.meta { color: var(--secondary); font-size: 0.94rem; }

footer {
  padding-block: 22px 36px;
  color: var(--secondary);
  border-top: 1px solid var(--line);
}

@media (max-width: 560px) {
  header { align-items: flex-start; flex-direction: column; }
  main { padding-top: 26px; }
}