:root{--bg:#f7f5ef;--surface:#ffffff;--surface-muted:#f1f6f4;--ink:#17211d;--muted:#66736e;--line:#d7ded9;--accent:#0f766e;--accent-dark:#105e58;--warn:#9a5414;--ok:#2f6f44;--shadow:0 20px 60px rgba(32,47,40,0.12)}*{box-sizing:border-box}html{color:var(--ink);background:var(--bg)}body{margin:0;font-family:Arial,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;letter-spacing:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.shell{min-height:100vh}.topbar{align-items:center;background:rgba(247,245,239,.92);border-bottom:1px solid var(--line);display:flex;gap:16px;justify-content:space-between;padding:18px clamp(18px,4vw,48px);position:-webkit-sticky;position:sticky;top:0;z-index:10}.brand{display:grid;grid-gap:2px;gap:2px}.brand strong{font-size:18px}.brand span{color:var(--muted);font-size:13px}.container{margin:0 auto;max-width:1180px;padding:32px clamp(18px,4vw,48px) 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