:root {
  --bg: #ffffff;
  --fg: #222222;
  --muted: #6b6b6b;
  --link: #1a5fb4;
  --code-bg: #f4f4f2;
  --border: #e3e3e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --fg: #e6e6e3;
    --muted: #9a9a96;
    --link: #78aeed;
    --code-bg: #232427;
    --border: #34353a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", sans-serif;
  font-size: 17px;
  line-height: 1.85;
}

a { color: var(--link); }

.site-header, .site-footer, main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}
.site-header { padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.site-header a { color: var(--fg); text-decoration: none; font-weight: 700; }
.site-footer { padding-top: 24px; padding-bottom: 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 48px; }

h1 { font-size: 1.6rem; line-height: 1.45; margin: 1.6em 0 0.3em; }
h2 { font-size: 1.35rem; margin: 2.2em 0 0.6em; padding-bottom: 0.2em; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.15rem; margin: 1.8em 0 0.5em; }
h4 { font-size: 1rem; margin: 1.6em 0 0.4em; }
.meta { color: var(--muted); font-size: 14px; margin-top: 0; }

figure { margin: 1.6em 0; }
img { max-width: 100%; height: auto; display: block; border-radius: 4px; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 0.5em; line-height: 1.6; }

code {
  font-family: ui-monospace, "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
  overflow-x: auto;
  line-height: 1.6;
}
pre code { background: none; padding: 0; font-size: 14px; }

ul { padding-left: 1.4em; }

.post-list { list-style: none; padding: 0; }
.post-list li { margin: 1em 0; }
.post-list time { display: block; color: var(--muted); font-size: 14px; }