:root {
  color-scheme: light;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  --ink: #172033;
  --muted: #60708f;
  --blue: #2d75dc;
  --line: rgb(83 153 229 / 24%);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 5%, rgb(156 216 255 / 68%), transparent 26%),
    radial-gradient(circle at 90% 30%, rgb(255 224 148 / 48%), transparent 25%),
    linear-gradient(145deg, #f8fcff, #eaf5ff 56%, #fffaf0);
  color: var(--ink);
}

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

.shell {
  width: min(850px, calc(100vw - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 0;
}

.brand {
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
  text-decoration: none;
}

.back {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 14px;
  background: rgb(255 255 255 / 70%);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

main {
  margin-bottom: 42px;
  border: 1px solid rgb(255 255 255 / 76%);
  border-radius: 32px;
  padding: clamp(24px, 6vw, 54px);
  background: rgb(255 255 255 / 80%);
  box-shadow: 0 26px 80px rgb(31 79 136 / 13%);
  backdrop-filter: blur(18px);
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(36px, 7vw, 58px);
  letter-spacing: -0.06em;
}

h2 {
  margin: 32px 0 10px;
  font-size: 23px;
  letter-spacing: -0.035em;
}

h3 {
  margin: 22px 0 8px;
  font-size: 18px;
}

p,
li {
  color: var(--muted);
  line-height: 1.75;
}

ul {
  margin: 8px 0 0;
  padding-left: 22px;
}

li + li {
  margin-top: 8px;
}

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

.updated {
  display: inline-block;
  margin: 10px 0 4px;
  border-radius: 999px;
  padding: 7px 11px;
  background: #e8f4ff;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.notice {
  margin-top: 30px;
  border-left: 4px solid #65aaf4;
  border-radius: 4px 18px 18px 4px;
  padding: 16px 18px;
  background: #edf7ff;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.links a {
  border-radius: 999px;
  padding: 10px 15px;
  background: #172033;
  color: white;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

footer {
  padding: 0 0 34px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 520px) {
  header {
    align-items: flex-start;
  }

  main {
    border-radius: 24px;
  }
}