:root { color-scheme: light dark; --paper: #fff; --text: #162135; --muted: #49576b; --rule: #dce5f1; --blue: #0056b7; --wash: #eef5ff; }
* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--paper); font: 1rem/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif; }
header, main, footer { width: min(calc(100% - 2.5rem), 46rem); margin: 0 auto; }
header { padding: 1.05rem 0; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .8rem 1.5rem; border-bottom: 1px solid var(--rule); }
.brand { display: inline-flex; align-items: center; gap: .65rem; color: var(--text); font-weight: 750; text-decoration: none; }
.brand img { border-radius: 22%; width: 34px; height: 34px; }
nav { display: flex; flex-wrap: wrap; gap: 1rem; font-size: .9rem; }
nav [aria-current] { font-weight: 750; }
main { padding: 2.65rem 0 2rem; }
h1, h2, h3 { margin: 0 0 .65rem; line-height: 1.4; }
h1 { font-size: clamp(1.8rem, 5.6vw, 2.55rem); letter-spacing: -.045em; }
h2 { font-size: 1.22rem; }
h3 { font-size: 1.03rem; }
p, ol { margin: 0 0 .7rem; }
ol { padding-left: 1.5rem; }
section { padding: 1.15rem 0; border-top: 1px solid var(--rule); }
.intro { margin: .5rem 0 1.65rem; color: var(--muted); }
.note { padding: .75rem 1rem; border-radius: .6rem; background: var(--wash); }
footer { padding: 1rem 0 2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .88rem; }
a { color: var(--blue); text-underline-offset: .18em; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
@media (prefers-color-scheme: dark) {
  :root { --paper: #141c2a; --text: #f2f6ff; --muted: #bac6d8; --rule: #374558; --blue: #a5cbff; --wash: #202e45; }
}

.languages { width: 100%; }