:root {
  --bg: #ffffff;
  --text: #1f2933;
  --muted: #616e7c;
  --accent: #1a7f5a;
  --border: #e4e7eb;
  --soft: #f5f7f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15191c;
    --text: #e4e7eb;
    --muted: #9aa5b1;
    --accent: #4cc38a;
    --border: #2c3338;
    --soft: #1d2226;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.85;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
.site-header { border-bottom: 1px solid var(--border); padding: 14px 0; }
.site-header .wrap { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.logo { font-weight: 700; font-size: 1.3rem; text-decoration: none; color: var(--text); }
.tagline { color: var(--muted); font-size: 0.85rem; }
.hero { padding: 32px 0 8px; }
.hero h1 { font-size: 1.6rem; line-height: 1.4; }
.post-list { list-style: none; padding: 0; }
.post-list li { border-bottom: 1px solid var(--border); padding: 16px 0; }
.post-list a { font-weight: 700; font-size: 1.1rem; }
.post-list time { display: block; color: var(--muted); font-size: 0.8rem; }
.post-list p { margin: 4px 0 0; color: var(--muted); }
.post h1 { font-size: 1.6rem; line-height: 1.4; }
.post h2 { border-left: 4px solid var(--accent); padding-left: 10px; margin-top: 2.2em; }
.post img { max-width: 100%; height: auto; }
.post table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.post th, .post td { border: 1px solid var(--border); padding: 6px 10px; }
.post pre { background: var(--soft); padding: 12px; overflow-x: auto; border-radius: 6px; }
.meta, .pr-note { color: var(--muted); font-size: 0.8rem; }
.download {
  display: block; background: var(--soft); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px; margin: 24px 0;
}
.site-footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 24px 0; color: var(--muted); font-size: 0.85rem; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }