:root{--ink:#16242a;--muted:#607078;--teal:#0f766e;--teal-dark:#0b5f59;--teal-soft:#eef9f7;--surface:#f6f8f9;--line:#dbe3e6;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--white);margin:0;font-family:Arial,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif}button,input{font:inherit}button,[role=button]{-webkit-tap-highlight-color:transparent}main{min-width:0;min-height:100vh;overflow:hidden}.page-shell{width:min(1080px,100% - 40px);margin-inline:auto}.topbar{border-bottom:1px solid var(--line);background:#fffffff5;height:66px}.header-inner{justify-content:space-between;align-items:center;height:100%;display:flex}.brand{color:var(--ink);letter-spacing:-.8px;font-size:20px;font-weight:900;text-decoration:none}.brand span,.site-footer strong span{color:var(--teal)}.header-note{color:var(--muted);align-items:center;gap:7px;font-size:12px;font-weight:700;display:inline-flex}.header-note 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