:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --rule: #d9d9d9;
  --link: #0b5fa5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #ececec;
    --muted: #a8a8a8;
    --rule: #333333;
    --link: #6fb3f0;
  }
}
* { box-sizing: border-box; }
html { background: var(--bg); color: var(--fg); }
body {
  margin: 0 auto;
  max-width: 44rem;
  padding: 2rem 1rem 3rem;
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.7;
}
header nav { text-align: right; font-size: 0.9rem; }
h1 { margin: 0.5rem 0 0; font-size: 2rem; letter-spacing: 0.02em; }
.tagline { margin: 0.25rem 0 2rem; font-size: 1.1rem; color: var(--muted); }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; border-bottom: 1px solid var(--rule); padding-bottom: 0.25rem; }
ul { padding-left: 1.25rem; }
li { margin: 0.4rem 0; }
a { color: var(--link); }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); font-size: 0.85rem; color: var(--muted); }

.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.25rem; margin-top: 1rem; }
.flow figure { margin: 0; }
.flow svg { display: block; width: 100%; height: auto; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; color: var(--muted); }
.flow figcaption { margin-top: 0.5rem; font-size: 0.9rem; line-height: 1.5; }
.flow figcaption strong { color: var(--fg); }