:root{--bg:#f6f8fc;--surface:#ffffff;--border:#dde3ea;--text:#1f1f1f;--muted:#5f6368;--accent:#1a73e8;--accent-soft:#e8f0fe;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--bg:#1b1b1f;--surface:#26272b;--border:#3a3b40;--text:#e8eaed;--muted:#9aa0a6;--accent:#8ab4f8;--accent-soft:#2a3b55}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Yu Gothic UI,Meiryo,system-ui,sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:var(--surface);border-bottom:1px solid var(--border)}.site-header-inner{max-width:1100px;margin:0 auto;padding:12px 16px 6px;display:flex;align-items:center;gap:16px}.logo{font-size:21px;font-weight:700;letter-spacing:.02em;display:inline-flex;align-items:center;gap:9px}.logo 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