:root{--navy:#0b2440;--navy2:#153a66;--gold:#c9a227;--ink:#1f2933;--mute:#5b6770;--line:#e5e8ec;--bg:#fff;--bg2:#f6f8fb}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-family:Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Hiragino Sans,Noto Sans JP,Meiryo,sans-serif;line-height:1.85}a{color:var(--navy2);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}header.site{border-bottom:1px solid var(--line);z-index:10;background:#fff;position:sticky;top:0}header.site .wrap{justify-content:space-between;align-items:center;height:64px;display:flex}.brand{color:var(--navy);letter-spacing:.02em;align-items:center;gap:10px;font-size:17px;font-weight:700;display:flex}.brand .mark{background:linear-gradient(135deg,var(--navy),var(--navy2));border-radius:6px;width:28px;height:28px;position:relative}.brand .mark:after{content:"";border:1.5px solid 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b{color:var(--navy)}footer.site{border-top:1px solid var(--line);color:var(--mute);margin-top:48px;padding:28px 0 40px;font-size:13px}footer.site .wrap{flex-wrap:wrap;justify-content:space-between;gap:12px 24px;display:flex}footer.site a{color:var(--mute)}.cats{flex-wrap:wrap;gap:8px;margin:20px 0 0;display:flex}.cats a{border:1px solid var(--line);color:var(--navy);border-radius:999px;padding:5px 12px;font-size:13px}.cats a.on{background:var(--navy);color:#fff;border-color:var(--navy)}@media (width<=640px){header.site .wrap{height:56px}.brand{font-size:15px}nav.main a{margin-left:12px;font-size:13px}.hero{padding:36px 0 32px}.hero h1,article.post h1{font-size:22px}.prose h2{font-size:19px}}