:root{--accent:#0284c7;--accent-dark:#075985;--accent-light:#0ea5e9;--text:#1e293b;--muted:#64748b;--bg:#f8fafc;--bg-card:#ffffff;--bg-soft:#f0f9ff;--border:#e2e8f0}*{box-sizing:border-box}html{scroll-behavior:smooth}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}body{margin:0;font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Yu Gothic,Noto Sans JP,system-ui,sans-serif;color:var(--text);background:var(--bg);font-size:17px;line-height:1.9}.container{max-width:760px;margin:0 auto;padding:0 20px}header.site{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:linear-gradient(to right,var(--accent-dark),var(--accent))}header.site .inner{justify-content:space-between;gap:12px;padding:14px 0;flex-wrap:wrap}.brand,header.site 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