:root{--ink:#16312f;--muted:#73827f;--teal:#1c7968;--line:#e3eae6;--bg:#f6f8f5;--soft:#eef5ef;--white:#fff;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft Yahei",sans-serif;font-size:14px;line-height:1.6}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}button:focus-visible,summary:focus-visible{outline:3px solid #81b8a7;outline-offset:4px}[hidden]{display:none!important}.topbar{height:80px;background:#fff;border-bottom:1px solid var(--line);padding:0 max(4%,calc((100vw - 1280px)/2));display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:12px;align-items:center;font-size:18px;font-weight:650;letter-spacing:.3px}.brand-icon{background:var(--ink);color:white;width:38px;height:38px;border-radius:10px;font:600 17px/38px 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