:root {
  color-scheme: dark;
  --background: #0b1017;
  --surface: #151e29;
  --surface-raised: #1b2938;
  --border: #314255;
  --text: #edf4fb;
  --muted: #9dafc1;
  --accent: #76adff;
  --accent-soft: #203a5c;
}

* { box-sizing: border-box; }

html { background: var(--background); }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 0%, rgba(57, 101, 153, .24), transparent 36rem),
    var(--background);
  color: var(--text);
  font: 17px/1.65 "Segoe UI", system-ui, -apple-system, sans-serif;
}

a { color: #b9d7ff; }
a:hover { color: #fff; }

.shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; }

header {
  padding: 32px 0 20px;
  border-bottom: 1px solid rgba(112, 142, 173, .32);
}

.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; color: var(--text); }
.mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid #4f7aaa;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
}

.brand b { font-size: 20px; }
.brand span { display: block; color: var(--muted); font-size: 13px; }

nav { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 22px; }
nav a { text-decoration: none; color: var(--muted); }
nav a[aria-current="page"], nav a:hover { color: var(--text); }

main { padding: 64px 0 80px; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .14em; font-size: 13px; font-weight: 750; }
h1 { margin: 8px 0 18px; max-width: 760px; font-size: clamp(38px, 7vw, 64px); line-height: 1.08; letter-spacing: -.035em; }
h2 { margin: 0 0 10px; font-size: 25px; line-height: 1.3; }
h3 { margin: 32px 0 8px; font-size: 20px; }
p { margin: 0 0 18px; }
.lede { max-width: 760px; color: #c7d6e5; font-size: 21px; }

.notice {
  margin: 34px 0;
  padding: 18px 20px;
  border: 1px solid #3e668f;
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: #102334;
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 36px; }
.card { padding: 24px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); }
.card p { color: var(--muted); margin: 0; }

.document { max-width: 800px; }
.document h1 { font-size: clamp(36px, 6vw, 52px); }
.document p, .document li { color: #c7d6e5; }
.document li { margin-bottom: 8px; }
.updated { color: var(--muted); font-size: 14px; }

footer { padding: 28px 0 44px; border-top: 1px solid rgba(112, 142, 173, .32); color: var(--muted); font-size: 14px; }
footer .shell { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

@media (max-width: 680px) {
  header { padding-top: 22px; }
  main { padding-top: 44px; }
  .grid { grid-template-columns: 1fr; }
}