:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; color: #253247; background: #f8f9fb; }
* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.85; }
a { color: #244f93; text-underline-offset: .2em; }
a:hover { color: #172f5b; }
a:focus-visible { outline: 3px solid #365f9d; outline-offset: 4px; }
header, main, footer { width: min(900px, calc(100% - 48px)); margin-inline: auto; }
header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; padding: 24px 0; border-bottom: 1px solid #dde2e9; }
.brand { font-size: 15px; font-weight: 700; color: #253247; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; }
nav a { text-decoration: none; }
nav a[aria-current] { font-weight: 700; text-decoration: underline; }
main { padding-block: 48px 32px; }
.eyebrow { color: #637186; font-size: 13px; letter-spacing: .06em; margin: 0 0 16px; }
h1 { color: #172237; font-size: clamp(27px, 4.2vw, 44px); line-height: 1.5; letter-spacing: -.025em; margin: 0 0 22px; }
h2 { font-size: 20px; line-height: 1.6; margin: 0 0 12px; }
p { margin: 0 0 14px; }
.lead { font-size: 18px; color: #4b5b71; }
section { padding-block: 30px; border-bottom: 1px solid #dde2e9; }
.notice { background: #eaf0f8; border-left: 3px solid #557caf; padding: 20px 24px; margin-top: 28px; border-radius: 0 8px 8px 0; }
.notice p { font-size: 15px; margin: 6px 0 0; }
.steps { padding-left: 24px; margin: 16px 0 0; }
.steps li { padding-left: 6px; margin-block: 14px; }
.steps span { display: block; color: #536177; font-size: 15px; }
code { font-size: 14px; overflow-wrap: anywhere; background: #edf0f5; padding: 2px 4px; border-radius: 3px; }
footer { padding-block: 24px 36px; font-size: 12px; color: #6a7688; }
footer p { margin-bottom: 8px; }
.skip { position: absolute; top: 8px; left: 8px; transform: translateY(-150%); background: white; padding: 4px 12px; }
.skip:focus { transform: none; }
@media (max-width: 600px) {
  header, main, footer { width: calc(100% - 32px); }
  main { padding-top: 32px; }
  header { align-items: flex-start; gap: 10px; padding-block: 18px; }
  nav { width: 100%; gap: 18px; }
  .lead { font-size: 16px; }
  .notice { padding: 16px; }
}