:root {
  color-scheme: light dark;
  --bg: #f5f7f2; --surface: #fcfdf9; --text: #18231c; --muted: #4d5c51;
  --accent: #286347; --tint: #ebf0e8; --border: #cad5cb;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--text); background: var(--bg); font-size: 16px; line-height: 1.9;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: .22em; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 2px; }
.skip { position: absolute; top: -100px; left: 16px; padding: 10px 20px; background: var(--surface); z-index: 1; }
.skip:focus { top: 12px; }
.brand { max-width: 900px; margin: auto; padding: 28px 32px; border-bottom: 1px solid var(--border); }
.brand a { display: inline-block; color: var(--text); font-size: 22px; font-weight: 750; text-decoration: none; }
.brand span { display: block; font-size: 12px; color: var(--muted); font-weight: 400; }
main { max-width: 780px; margin: auto; padding: 48px 32px 64px; }
h1, h2 { line-height: 1.5; text-wrap: pretty; }
h1 { font-size: clamp(1.65rem, 4.6vw, 2.3rem); margin: 8px 0 14px; letter-spacing: -.025em; }
h2 { font-size: 1.22rem; margin: 0 0 16px; }
h2 span { display: block; font-size: .8rem; letter-spacing: .12em; color: var(--accent); margin-bottom: 6px; }
p { margin: 0 0 18px; }
.eyebrow { color: var(--accent); font-size: .75rem; letter-spacing: .16em; font-weight: 700; margin-bottom: 8px; }
.date { font-size: .85rem; color: var(--muted); margin-bottom: 24px; }
.summary { background: var(--tint); border-left: 3px solid var(--accent); padding: 24px; margin: 32px 0; border-radius: 0 12px 12px 0; }
.summary h2 { font-size: 1rem; }
.summary p { margin: 0; }
nav { border: 1px solid var(--border); border-radius: 12px; padding: 24px; background: var(--surface); margin-bottom: 40px; }
nav h2 { font-size: 1rem; }
nav ol { margin: 0; padding-left: 24px; }
nav li a { display: inline-block; padding: 7px 0; min-height: 44px; }
section { padding-top: 28px; margin-top: 28px; border-top: 1px solid var(--border); scroll-margin-top: 24px; }
ul { padding-left: 24px; margin: 0 0 20px; }
li { padding-left: 3px; margin-bottom: 10px; }
nav li { margin-bottom: 0; }
code { font-family: ui-monospace, monospace; font-size: .86em; overflow-wrap: anywhere; }
dl { margin: 0; }
dl div { padding: 12px 0; border-bottom: 1px solid var(--border); }
dt { font-size: .85rem; color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
footer { max-width: 900px; margin: auto; padding: 24px 32px; border-top: 1px solid var(--border); color: var(--muted); font-size: .8rem; }
@media (max-width: 480px) {
  .brand, footer { padding: 20px; }
  main { padding: 32px 20px 48px; }
  .summary, nav { padding: 20px; }
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111613; --surface: #161c18; --text: #e4eae4; --muted: #bfcac1; --accent: #a3d4bb; --tint: #202923; --border: #455249; }
}
@media print {
  :root { --bg: white; --text: black; --muted: #333; --accent: #17452f; }
  .skip, nav { display: none; }
  main { max-width: none; padding: 20px 0; }
  section { break-inside: avoid; }
}