:root{--ink:#27251f;--muted:#777165;--paper:#f4f0e6;--sheet:#fffdf8;--line:#d9d2c3;--red:#d7563c;--blue:#2e5962;--yellow:#eabf55}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);min-width:320px;margin:0;font-family:Trebuchet MS,PingFang SC,Microsoft YaHei,sans-serif}button,input,select{font:inherit;color:inherit}button{cursor:pointer}.topbar{border-bottom:1px solid var(--line);z-index:10;backdrop-filter:blur(12px);background:#f4f0e6f0;justify-content:space-between;align-items:center;height:78px;padding:0 clamp(22px,4vw,64px);display:flex;position:sticky;top:0}.brand{color:inherit;align-items:center;gap:10px;text-decoration:none;display:flex}.brand-mark{background:var(--red);color:#fff;border-radius:50% 50% 45% 55%;place-items:center;width:38px;height:38px;font:700 22px Georgia,serif;display:grid;transform:rotate(-5deg)}.brand b{letter-spacing:.08em;display:block}.brand 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