@charset "UTF-8";

/* 全ページ共通。ページ固有の指定は専用クラスに限定する。 */
:root {
  color-scheme: light;
  --color-text: #172c36;
  --color-muted: #4b606a;
  --color-brand: #005b70;
  --color-background: #fff;
  --color-surface: #eef6f8;
  --color-border: #c6d9de;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --content-width: 68rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  color: var(--color-text);
  background: var(--color-background);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 1rem;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
main { flex: 1; }
h1, h2, h3 { margin: 0 0 var(--space-2); line-height: 1.5; }
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }
p, ul, ol, dl { margin: 0 0 var(--space-2); }
a { color: var(--color-brand); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 0.15em; }
:focus-visible { outline: 3px solid var(--color-brand); outline-offset: 4px; }
img, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
input, select, textarea { max-width: 100%; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.75rem; border: 1px solid var(--color-border); text-align: left; }
th { background: var(--color-surface); }
/* 幅のある仕様表はこのクラスで包み、必要に応じてラベルとtabindexを付ける。 */
.table-scroll { overflow-x: auto; }
.container { width: min(var(--content-width), calc(100% - 2.5rem)); margin-inline: auto; }
.skip-link { position: absolute; top: 0.5rem; left: 0.5rem; padding: 0.75rem 1rem; background: #fff; transform: translateY(-200%); z-index: 10; }
.skip-link:focus { transform: translateY(0); }
.site-header { padding-block: var(--space-3); border-top: 5px solid var(--color-brand); border-bottom: 1px solid var(--color-border); }
.site-name { margin: 0; color: var(--color-brand); font-size: 1.6rem; font-weight: 700; }
.site-tagline { margin: 0; color: var(--color-muted); font-size: 0.875rem; }
.intro { max-width: 49rem; padding-block: clamp(2.5rem, 7vw, 6rem); }
.eyebrow { margin-bottom: var(--space-3); color: var(--color-brand); font-weight: 700; }
.lead { max-width: 42rem; margin-block: var(--space-3) var(--space-5); font-size: 1.125rem; }
.notice { padding: var(--space-3); border-left: 3px solid var(--color-brand); background: var(--color-surface); }
.notice h2 { font-size: 1.125rem; }
.notice p { margin: 0; }
.site-footer { padding-block: var(--space-3); border-top: 1px solid var(--color-border); color: var(--color-muted); }
small { font-size: 0.875rem; }
@media (min-width: 48rem) {
  .container { width: min(var(--content-width), calc(100% - 5rem)); }
  .notice { padding: var(--space-4); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}