:root {
  color-scheme: light;
  --ink: #3e3336;
  --muted: #716267;
  --paper: #fffdf9;
  --accent: #a64f60;
  --line: #eadbd4;
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: #8e3548; text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid #c56b7d; outline-offset: 3px; }
.article-shell { width: min(100% - 32px, 760px); margin: 0 auto; padding: 24px 0 56px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 30px; font-size: .94rem; }
.eyebrow { margin: 0; color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .12em; }
h1 { margin: 8px 0 12px; font-size: clamp(1.8rem, 7vw, 2.6rem); line-height: 1.35; }
h2 { margin-top: 2.2em; font-size: 1.42rem; line-height: 1.5; }
h3 { margin-top: 1.8em; font-size: 1.12rem; }
.dek { color: var(--muted); font-size: 1.08rem; }
.article-meta { color: var(--muted); font-size: .9rem; }
.note, .result { margin: 20px 0; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff7f1; }
.result { background: #f7f4ee; }
.table-wrap { overflow-x: auto; margin: 18px 0; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; }
th { white-space: nowrap; }
figure { margin: 24px 0; padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
figure img { display: block; width: min(100%, 560px); height: auto; margin: 0 auto; }
figcaption { margin-top: 10px; color: var(--muted); font-size: .9rem; }
.article-footer { display: grid; gap: 8px; margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line); }
@media (max-width: 420px) {
  .article-shell { width: min(100% - 24px, 760px); padding-top: 18px; }
  th, td { padding: 8px 6px; }
}