:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: #183c35;
  background: #f7f8f3;
  line-height: 1.8;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-underline-offset: 0.25em; }
button { font: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid #b54b20; outline-offset: 5px; }
.site-header, main, footer { width: min(1080px, calc(100% - 48px)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 26px; border-bottom: 1px solid #d8ded3; }
.site-header > a:last-child { font-size: 0.85rem; }
.brand { text-decoration: none; font-size: 1.7rem; font-weight: 800; letter-spacing: 0.06em; line-height: 1.2; }
.brand span { display: block; font-size: 0.6rem; letter-spacing: 0.18em; margin-top: 5px; }
.hero { padding-block: 72px 64px; }
.hero.compact { padding-bottom: 40px; }
.eyebrow { color: #45655a; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.13em; }
h1 { font-size: clamp(2rem, 5vw, 3.7rem); line-height: 1.5; letter-spacing: 0.02em; margin-block: 20px; }
h2 { font-size: 1.45rem; line-height: 1.5; }
h3 { font-size: 1.2rem; margin-block: 22px 10px; }
.lead { color: #456056; font-size: 1rem; margin-bottom: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 28px; border: 0; border-radius: 6px; padding: 14px 23px; background: #204d40; color: #fff; text-decoration: none; cursor: pointer; font-weight: 600; }
.button:hover { background: #12372e; }
.section-heading { margin-bottom: 24px; }
.section-heading p, .section-heading h2 { margin-block: 4px; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { padding: 28px; border-radius: 10px; }
.card p { margin-bottom: 0; color: #3f5b50; font-size: 0.93rem; }
.card-number { font-size: 0.75rem; letter-spacing: 0.1em; }
.sky { background: #dfebef; }
.leaf { background: #e4ecda; }
.sun { background: #f1e9ce; }
.notice { border-left: 3px solid #8c9e81; padding: 4px 20px; margin-block: 44px; color: #4b6154; font-size: 0.85rem; }
.notice p { margin-block: 4px; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; border-top: 1px solid #d8ded3; padding-block: 24px; color: #4b6154; font-size: 0.8rem; }
.batch { font-family: ui-monospace, monospace; font-size: 0.8rem; overflow-wrap: anywhere; }
.interactive { border: 1px solid #d6dfcc; border-radius: 10px; background: #eaf0e2; padding: 32px; }
output { display: block; margin-block: 26px; font-size: 1.25rem; font-weight: 600; }
.test-details { margin-block: 40px; }
dl > div { display: grid; grid-template-columns: 120px minmax(0, 1fr); padding-block: 12px; border-bottom: 1px solid #d8ded3; }
dt { font-weight: 600; }
dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 640px) {
  .site-header, main, footer { width: calc(100% - 36px); }
  .site-header { padding-block: 20px; }
  .site-header > a:last-child { font-size: 0.75rem; }
  .hero { padding-block: 42px; }
  .lead { font-size: 0.93rem; }
  .cards { grid-template-columns: 1fr; gap: 14px; }
  .card, .interactive { padding: 24px; }
  dl > div { grid-template-columns: 92px minmax(0, 1fr); font-size: 0.9rem; }
}