:root{--bg:#ffffff;--surface:#ffffff;--fg:#0a0a0a;--ink:#0a0a0a;--muted:#6b7280;--soft:#f5f6f7;--accent:#0a0a0a;--accent-hover:#333333;--border:#ebebeb;--maxw:1080px;--brand:#3b54ff;--brand-hover:#2c41e0;--hero-bg:#ffffff}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,Segoe UI,Hiragino Sans,Noto Sans JP,Meiryo,sans-serif;line-height:1.8;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.siteHeader{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);-webkit-backdrop-filter:saturate(180%) blur(8px);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--border)}.siteHeaderInner{max-width:var(--maxw);margin:0 auto;padding:.9rem 1.5rem;justify-content:space-between}.brand,.siteHeaderInner{display:flex;align-items:center}.brand{line-height:1}.headerNav{font-size:.9rem;color:var(--muted);font-weight:600}.headerNav:hover{color:var(--fg)}