:root {
  color-scheme: light;
  --background: #f4f6f8;
  --surface: #ffffff;
  --text: #17212b;
  --muted: #5f6b76;
  --border: #dce2e8;
  --accent: #235ea7;
  --accent-soft: #eaf2fc;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--background);
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.page {
  width: min(100% - 32px, 800px);
  margin: 40px auto;
}

.document {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 18px 50px rgb(23 33 43 / 8%);
}

.masthead {
  padding: 42px 48px 36px;
  border-top: 5px solid var(--accent);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 30px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand-mark {
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--accent-soft);
}

h1,
h2 {
  line-height: 1.25;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 7vw, 3rem);
  letter-spacing: -0.04em;
}

h2 {
  margin: 42px 0 12px;
  font-size: 1.28rem;
  letter-spacing: -0.015em;
}

p,
ul {
  margin: 0 0 16px;
}

ul {
  padding-left: 24px;
}

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

.summary {
  max-width: 650px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.updated {
  display: inline-block;
  margin-top: 24px;
  padding: 7px 11px;
  color: var(--muted);
  background: var(--background);
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
}

.content {
  padding: 12px 48px 48px;
}

.contents {
  margin: 28px 0 10px;
  padding: 20px 22px;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.contents strong {
  display: block;
  margin-bottom: 8px;
}

.contents ol {
  columns: 2;
  gap: 32px;
  margin: 0;
  padding-left: 20px;
}

.contents li {
  break-inside: avoid;
  margin: 4px 0;
}

.contents a {
  color: var(--muted);
}

.notice {
  margin: 24px 0;
  padding: 18px 20px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
}

.contact {
  margin-top: 42px;
  padding: 24px;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.contact h2 {
  margin-top: 0;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 48px;
  color: var(--muted);
  background: #fafbfc;
  border-top: 1px solid var(--border);
  font-size: 0.86rem;
}

.footer nav {
  display: flex;
  gap: 18px;
}

@media (max-width: 640px) {
  .page {
    width: 100%;
    margin: 0;
  }

  .document {
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .masthead,
  .content {
    padding-right: 24px;
    padding-left: 24px;
  }

  .masthead {
    padding-top: 30px;
  }

  .contents ol {
    columns: 1;
  }

  .footer {
    flex-direction: column;
    padding-right: 24px;
    padding-left: 24px;
  }
}

@media print {
  :root {
    --background: #ffffff;
  }

  .page {
    width: 100%;
    margin: 0;
  }

  .document {
    border: 0;
    box-shadow: none;
  }

  .masthead,
  .content {
    padding-right: 0;
    padding-left: 0;
  }

  .footer {
    padding-right: 0;
    padding-left: 0;
  }
}