:root {
  --bg: #fafafa;
  --surface: #f8fafc;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #2563eb;
  --ok-bg: #ecfdf5;
  --ok: #15803d;
  --warn-bg: #fffbeb;
  --warn: #b45309;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.7;
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}
h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 8px; border-bottom: 2px solid var(--border); padding-bottom: 12px; }
h2 { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; margin: 40px 0 12px; padding-top: 16px; border-top: 1px solid var(--border); }
h3 { font-size: 17px; font-weight: 700; margin: 24px 0 8px; }
h4 { font-size: 15px; font-weight: 700; margin: 16px 0 6px; color: var(--muted); }
p, ul, ol { margin: 8px 0 12px; }
code { background: var(--surface); padding: 2px 6px; border-radius: 4px; font-size: 13px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  line-height: 1.5;
}
pre code { background: transparent; padding: 0; }
table { border-collapse: collapse; width: 100%; margin: 12px 0 20px; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface); font-weight: 600; color: var(--muted); font-size: 12px; letter-spacing: 0.03em; text-transform: uppercase; }
tr:hover td { background: var(--surface); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
blockquote { border-left: 3px solid var(--border); padding: 4px 16px; color: var(--muted); margin: 12px 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
strong { font-weight: 700; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
header.meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 32px;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}
header.meta a { color: var(--muted); }