:root {
  color-scheme: light;
  --ink: #122c32;
  --muted: #587078;
  --paper: #f5f8f7;
  --line: #cbd8d5;
  --accent: #16738a;
  --accent-soft: #dceff1;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  line-height: 1.8;
}
a { color: var(--accent); text-underline-offset: .2em; }
.shell { width: min(920px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
}
.brand { color: var(--ink); font-weight: 700; letter-spacing: .02em; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: .9rem; }
.hero { padding: 88px 0 64px; border-top: 1px solid var(--line); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: .78rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
h1 { max-width: 760px; margin: 0; font-size: clamp(2.3rem, 6vw, 5rem); line-height: 1.06; letter-spacing: -.045em; }
.lead { max-width: 720px; margin: 30px 0 0; color: var(--muted); font-size: clamp(1rem, 2.2vw, 1.25rem); }
.notice { margin-top: 34px; padding: 18px 22px; background: var(--accent-soft); border-left: 3px solid var(--accent); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 28px 0 72px; background: var(--line); border: 1px solid var(--line); }
.grid article { min-height: 230px; padding: 28px; background: var(--paper); }
.grid h2 { margin: 0 0 12px; font-size: 1.05rem; }
.grid p { margin: 0; color: var(--muted); font-size: .94rem; }
.document { padding: 60px 0 90px; border-top: 1px solid var(--line); }
.document h1 { font-size: clamp(2.1rem, 5vw, 4rem); }
.document h2 { margin: 48px 0 10px; font-size: 1.25rem; }
.document p, .document li { color: var(--muted); }
.document ul { padding-left: 1.25rem; }
.meta { margin-top: 18px; color: var(--muted); font-size: .88rem; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 28px 0 42px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
@media (max-width: 720px) {
  .site-header, footer { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 56px; }
  .grid { grid-template-columns: 1fr; }
  .grid article { min-height: 0; }
}