:root{--ink:#20372e;--muted:#727972;--forest:#3f6f7a;--forest-dark:#284f59;--sage:#dbe9e8;--paper:#f5f0e5;--paper-light:#fbf8f0;--white:#fffefa;--terracotta:#b36e55;--terracotta-soft:#f0ddd4;--line:#d9ddd6}*{box-sizing:border-box}html{background:var(--paper)}body{color:var(--ink);background:radial-gradient(circle at 12% 3%, #fffffff2 0, #fff0 28%), var(--paper);margin:0;font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,system-ui,sans-serif}button,input,select{font:inherit}button{color:inherit}button:focus-visible,input:focus-visible,select:focus-visible{outline-offset:2px;outline:3px solid #b36e5540}.app-shell{min-height:100vh;padding:28px clamp(18px,4vw,56px) 64px}.topbar{justify-content:space-between;align-items:center;gap:24px;max-width:1500px;margin:0 auto;display:flex}.brand{align-items:center;gap:14px;display:flex}.brand-mark{background:var(--forest);color:#fff;border-radius:14px;place-items:center;width:46px;height:46px;font:700 21px/1 serif;display:grid;box-shadow:0 8px 24px 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