:root {
  color-scheme: dark;
  --bg: #08111d;
  --panel: #202a38;
  --panel-strong: #2b3544;
  --text: #f3f7fb;
  --muted: #aab4c2;
  --accent: #47d8f4;
  --stroke: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  background:
    radial-gradient(circle at 82% 0%, rgba(71, 216, 244, 0.16), transparent 30rem),
    radial-gradient(circle at 0% 85%, rgba(79, 104, 155, 0.16), transparent 28rem),
    linear-gradient(145deg, #070b16, var(--bg));
  color: var(--text);
  line-height: 1.7;
}

.document {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.document::before {
  content: "";
  display: block;
  width: 76px;
  height: 76px;
  margin-bottom: 22px;
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 38%, rgba(255, 255, 255, 0.82), transparent 9%),
    radial-gradient(circle at 50% 50%, #aebcc8, #56636f 38%, #101923 72%),
    linear-gradient(145deg, #26323f, #101720);
  border: 1px solid rgba(71, 216, 244, 0.32);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.4), 0 0 24px rgba(71, 216, 244, 0.12);
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 8vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

h2 {
  margin: 34px 0 8px;
  font-size: clamp(22px, 4vw, 30px);
  letter-spacing: -0.025em;
}

p,
li {
  color: var(--muted);
  font-size: 17px;
}

ul {
  padding-left: 22px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.back-link {
  display: inline-flex;
  margin-bottom: 18px;
  color: #07121a;
  background: var(--accent);
  border-radius: 999px;
  padding: 7px 13px;
  font-weight: 700;
  font-size: 13px;
}

.updated {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--stroke);
  color: var(--muted);
  font-size: 14px;
}

@media (min-width: 720px) {
  .document {
    margin-top: 42px;
    padding: 48px;
    border-radius: 30px;
    background: color-mix(in srgb, var(--panel) 86%, transparent);
    border: 1px solid var(--stroke);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
  }
}