:root { --bg: #f3f3ef; --card: #fff; --ink: #17171c; --muted: #6c6c76; --line: #e3e3dc; --primary: #2d5bff; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: 'Noto Sans JP', system-ui, sans-serif; line-height: 1.85; font-size: 15px; }
header { background: var(--card); border-bottom: 1px solid var(--line); padding: 12px 16px; }
header .in { max-width: 860px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
header img { height: 30px; display: block; }
header a.back { color: var(--primary); font-weight: 700; text-decoration: none; font-size: 14px; }
main { max-width: 860px; margin: 24px auto 48px; padding: 0 16px; }
article { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 36px 40px; }
@media (max-width: 600px) { article { padding: 24px 18px; } }
h1 { font-size: 24px; margin: 0 0 6px; }
.date { color: var(--muted); font-size: 13px; margin: 0 0 24px; }
h2 { font-size: 17px; margin: 32px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
h2:first-of-type { border-top: none; }
p { margin: 0 0 10px; }
ol, ul { margin: 0 0 10px; padding-left: 1.6em; }
li { margin: 2px 0; }
table { width: 100%; border-collapse: collapse; margin: 8px 0 16px; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: #fafaf7; width: 32%; font-weight: 700; }
@media (max-width: 600px) { th, td { display: block; width: 100%; } th { border-bottom: none; } }
.end { text-align: right; margin-top: 28px; }
footer { text-align: center; font-size: 13px; color: var(--muted); padding: 0 16px 40px; }
footer a { color: var(--muted); margin: 0 8px; }