:root {
  --text: #222;
  --muted: #666;
  --bg: #fff;
  --accent: #1a6fd1;
  --line: #e5e5e5;
  --soft: #f6f7f9;
}
@media (prefers-color-scheme: dark) {
  :root { --text: #e8e8e8; --muted: #a0a0a0; --bg: #16181c; --accent: #6aa8ff; --line: #2c2f36; --soft: #1f2228; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.02em;
}
a { color: var(--accent); }
.container { max-width: 760px; margin: 0 auto; padding: 0 16px 48px; }
.site-header {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  max-width: 760px; margin: 0 auto; padding: 16px; border-bottom: 1px solid var(--line);
}
.site-name { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.lang-switch a { margin-left: 10px; font-size: 0.9rem; }
.site-description { color: var(--muted); }
.article-title { font-size: 1.7rem; line-height: 1.4; margin: 28px 0 8px; }
.meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 24px; }
.toc { background: var(--soft); border: 1px solid var(--line); border-radius: 8px; padding: 12px 18px; margin: 24px 0; }
.toc-title { font-weight: 700; margin: 0 0 4px; }
.toc ol { margin: 0; padding-left: 1.4em; }
.toc ol ol { padding-left: 1.2em; }
.article-body h2 { font-size: 1.35rem; margin: 2.2em 0 0.8em; padding-bottom: 6px; border-bottom: 2px solid var(--line); }
.article-body h3 { font-size: 1.15rem; margin: 1.8em 0 0.6em; }
.article-body img { max-width: 100%; height: auto; }
.article-body pre { background: var(--soft); padding: 12px; overflow-x: auto; border-radius: 6px; font-size: 0.9rem; }
.article-body code { background: var(--soft); padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }
.article-body pre code { background: none; padding: 0; }
.article-body blockquote { margin: 1.2em 0; padding: 4px 16px; border-left: 4px solid var(--line); color: var(--muted); }
.article-body table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 6px 10px; }
.post-list { list-style: none; padding: 0; }
.post-list li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.post-list a { font-weight: 700; font-size: 1.05rem; text-decoration: none; }
.post-list time { display: block; color: var(--muted); font-size: 0.85rem; }
.post-list .excerpt { margin: 4px 0 0; color: var(--muted); font-size: 0.92rem; }
.back { margin-top: 40px; }
.site-footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 24px 16px; border-top: 1px solid var(--line); }
.ad-slot, .affiliate-slot { margin: 24px 0; }