:root {
  color-scheme: light;
  --ink: #23312c;
  --muted: #64716c;
  --paper: #fffdf8;
  --canvas: #f1f3ed;
  --line: #d9ded6;
  --green: #176b55;
  --green-dark: #0d493a;
  --green-soft: #e8f4ee;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.85;
}
a { color: var(--green-dark); text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid #9b5c13; outline-offset: 4px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; padding: .65rem 1rem; color: #fff; background: var(--green-dark); border-radius: .5rem; }
.page { width: min(100% - 2rem, 820px); margin: 2rem auto 4rem; background: var(--paper); border: 1px solid var(--line); border-radius: 22px; overflow: hidden; }
.site-nav { display: flex; flex-wrap: wrap; gap: .55rem; padding: .85rem clamp(1.25rem, 6vw, 3.5rem); color: var(--muted); background: #f6f7f3; border-bottom: 1px solid var(--line); font-size: .84rem; }
.site-nav a { font-weight: 700; }
header { padding: clamp(2.2rem, 7vw, 4rem) clamp(1.3rem, 7vw, 4rem); color: #fff; background: linear-gradient(145deg, #0d493a, #176b55); }
.eyebrow { margin: 0 0 .7rem; color: #cce8dc; font-size: .8rem; font-weight: 800; letter-spacing: .12em; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.25; }
.lead { max-width: 670px; margin: 1.2rem 0 0; color: #e4f2ec; }
.updated { margin: 1rem 0 0; color: #cce8dc; font-size: .84rem; }
main { padding: clamp(2rem, 6vw, 4rem); }
h2 { margin: 3rem 0 .8rem; font-size: clamp(1.35rem, 3vw, 1.8rem); line-height: 1.4; }
h3 { margin: 2rem 0 .5rem; color: var(--green-dark); font-size: 1.12rem; }
p, li { max-width: 72ch; }
li { margin: .45rem 0; }
.note { padding: 1rem 1.1rem; background: var(--green-soft); border-left: 4px solid var(--green); border-radius: 10px; }
footer { display: flex; flex-wrap: wrap; gap: .9rem 1.25rem; padding: 1.2rem clamp(1.3rem, 7vw, 4rem) 2rem; color: var(--muted); background: #f6f7f3; border-top: 1px solid var(--line); font-size: .84rem; }
@media (max-width: 680px) { .page { width: 100%; margin: 0; border: 0; border-radius: 0; } }