:root {
  --paper: #f2efe7;
  --ink: #171815;
  --muted: #68685f;
  --line: rgba(23, 24, 21, .18);
  --accent: #ea4f2d;
  --page: min(88vw, 820px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; line-height: 1.8; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 10; padding: 10px 14px; color: white; background: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
header, main, footer { width: var(--page); margin-inline: auto; }
header { padding: 28px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line); }
header a { color: inherit; text-decoration: none; font-size: 1.25rem; font-weight: 700; }
main { padding: 56px 0 80px; }
main:focus, main > section[lang]:focus { outline: none; }
h1 { margin: 0 0 8px; font-family: "Iowan Old Style", "Yu Mincho", serif; font-size: clamp(2.5rem, 8vw, 4.8rem); line-height: 1; }
h2 { margin-top: 2.6rem; font-size: 1.2rem; }
p, li { color: var(--muted); }
.notice { margin: 28px 0; padding: 18px; border-left: 3px solid var(--accent); background: rgba(255,255,255,.45); }
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
h1, h2 { scroll-margin-top: 24px; }
footer { padding: 24px 0 44px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: inherit; }
.language-nav { display: flex; flex-wrap: wrap; gap: 16px; }
.language-nav a { min-height: 44px; display: inline-flex; align-items: center; color: var(--accent); font: 650 .95rem -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; }
.language-nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 560px) {
  header { align-items: flex-start; flex-direction: column; }
}