:root{--bg:#edf2e8;--surface:#edf2e8;--surface-soft:#e2eadf;--text:#243027;--muted:#647067;--faint:#818c83;--border:#c8d2c5;--accent:#3f6d49;--accent-soft:#d7e5d4;--header-bg:#edf2e8}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;margin:0;font-family:Geist,Inter,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.8;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,select{color:inherit}img{max-width:100%;display:block}::selection{background:var(--accent-soft)}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.skip-link{z-index:100;background:var(--text);color:var(--bg);padding:8px 14px;position:fixed;top:8px;left:8px;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.mono{letter-spacing:.05em;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace}.page-shell{width:min(70rem,100% - 48px);margin-inline:auto}.site-header{z-index:50;pointer-events:none;background:var(--header-bg);border-bottom:1px solid var(--border);position:fixed;top:0;left:0;right:0}.header-shell{pointer-events:auto;background:0 0;grid-template-columns:1fr auto 1fr;align-items:center;width:min(70rem,100% - 48px);height:70px;margin:0 auto;padding:0;display:grid;position:relative}.brand{letter-spacing:-.04em;width:fit-content;font-size:1.2rem;font-weight:750;line-height:1}.brand span{color:var(--accent)}.primary-nav{gap:6px;display:flex}.primary-nav a{color:var(--muted);border-bottom:1px solid #0000;margin-left:26px;padding:8px 0 5px;font-size:.88rem;line-height:1.4;transition:color .18s,background .18s}.primary-nav 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