:root {
  --brand-blue: #2F80FF;
  --brand-navy: #0F2D5B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--brand-navy);
  background: #FFFFFF;
  font-synthesis: none;
  line-height: 1.85;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--brand-navy); text-decoration-color: var(--brand-blue); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
header {
  max-width: 1000px;
  margin: auto;
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  gap: 20px;
  border-bottom: 1px solid var(--border);
}
header a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; font-weight: 700; }
.brand-link { flex-shrink: 0; }
.brand-logo { display: block; width: 180px; height: auto; max-width: 46vw; object-fit: contain; }
.help-link { gap: 8px; white-space: nowrap; }
.help-link::after { content: "↗"; color: var(--brand-blue); font-size: 18px; }
main {
  max-width: 760px;
  margin: 40px auto 64px;
  padding: 40px;
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow-wrap: anywhere;
}
h1 { font-size: 28px; line-height: 1.5; margin: 0 0 28px; letter-spacing: .02em; }
h1::before { content: ""; display: block; width: 32px; height: 4px; margin-bottom: 18px; border-radius: 2px; background: var(--brand-blue); }
h2 { font-size: 20px; margin: 36px 0 12px; }
p, ul, ol { margin: 12px 0; }
li { margin: 8px 0; }
li::marker { color: var(--brand-blue); }
dt { font-weight: 700; margin-top: 16px; }
dd { margin-left: 0; }
footer { max-width: 1000px; margin: auto; padding: 24px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; border-top: 1px solid var(--border); font-size: 14px; }
footer a { min-height: 44px; display: inline-flex; align-items: center; }
footer button[data-ad-privacy] { min-height: 44px; padding: 4px 0; border: 0; background: transparent; font: inherit; color: var(--brand-navy); text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
footer button[data-ad-privacy][hidden] { display: none; }
footer button:focus-visible { outline: 3px solid var(--brand-blue); outline-offset: 4px; }
.footer-brand { font-weight: 700; margin-right: auto; }
.copyright { color: var(--text-muted); }
.back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 10px 24px;
  margin: 20px 0;
  border: 1px solid var(--brand-navy);
  border-radius: 10px;
  background: var(--brand-navy);
  color: #FFFFFF;
  text-align: center;
  text-decoration: none;
  font-weight: 700;
}
.back:hover { background: #183E73; border-color: #183E73; }
.note { color: var(--text-muted); font-size: 14px; }
table { width: 100%; border-collapse: collapse; table-layout: fixed; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { width: 32%; }
a:focus-visible { outline: 3px solid var(--brand-blue); outline-offset: 4px; }
@media (max-width: 600px) {
  header { padding: 12px 16px; min-height: 76px; gap: 16px; }
  .brand-logo { width: 148px; }
  main { margin: 16px 12px 32px; padding: 24px 20px; border-radius: 12px; }
  h1 { font-size: 25px; }
  footer { padding: 16px; gap: 12px 18px; font-size: 13px; }
  .footer-brand { flex-basis: 100%; }
}