:root {
  --chalk: #eff1ec; --card: #fbfcf9; --ink: #16181b; --muted: #5b6169;
  --line: #d6dad2; --volt: #c4f82a; --volt-ink: #2c3a05; --tarmac: #16181b;
  --sans: system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --cond: 'Arial Narrow', 'Roboto Condensed', system-ui, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--chalk); line-height: 1.65; }

.lhead { background: var(--tarmac); }
.lhead nav { max-width: 820px; margin: 0 auto; padding: 18px 22px; display: flex; align-items: center; gap: 16px; }
.lhead .brand { color: #eff1ec; font-weight: 800; text-transform: uppercase; letter-spacing: -0.01em; font-size: 20px; text-decoration: none; }
.lhead .brand b { color: var(--volt); }
.lhead .sp { flex: 1; }
.lhead a.back { color: #9aa1a8; text-decoration: none; font-size: 14px; }
.lhead a.back:hover { color: #eff1ec; }

.wrap { max-width: 820px; margin: 0 auto; padding: 44px 22px 90px; }
h1 { font-size: clamp(30px, 5vw, 42px); font-weight: 800; letter-spacing: -0.02em; margin: 0 0 6px; }
.updated { color: var(--muted); font-size: 14px; margin: 0 0 26px; }
.intro { font-size: 17px; color: #2b2e31; margin: 0 0 28px; }

.toc { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 20px; margin-bottom: 34px; }
.toc strong { font-family: var(--cond); text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px; color: var(--muted); display: block; margin-bottom: 6px; }
.toc a { display: inline-block; margin-right: 16px; padding: 3px 0; color: var(--ink); text-decoration: none; font-size: 14px; }
.toc a:hover { color: var(--volt-ink); text-decoration: underline; }

h2 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; margin: 36px 0 10px; scroll-margin-top: 20px; }
h2 .num { color: var(--muted); font-weight: 700; margin-right: 8px; }
h3 { font-size: 16px; font-weight: 700; margin: 20px 0 6px; }
p, li { color: #2b2e31; font-size: 16px; }
p { margin: 0 0 14px; }
ul { padding-left: 22px; margin: 0 0 14px; }
li { margin: 5px 0; }
a { color: var(--volt-ink); }
strong.k { color: var(--ink); }

.callout { background: #fbfcf9; border: 1px solid var(--line); border-left: 3px solid var(--volt); border-radius: 0 10px 10px 0; padding: 14px 18px; margin: 0 0 20px; font-size: 15px; }

footer.lfoot { border-top: 1px solid var(--line); }
.lfoot .row { max-width: 820px; margin: 0 auto; padding: 24px 22px; font-size: 14px; color: var(--muted); display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.lfoot .row .brand { font-weight: 800; text-transform: uppercase; color: var(--ink); }
.lfoot .row .brand b { color: #0e7a57; }
.lfoot .row .sp { flex: 1; }
.lfoot a { color: var(--muted); text-decoration: none; }
.lfoot a:hover { color: var(--ink); }