:root{--bg:#f6f7f9;--surface:#ffffff;--surface-2:#eef1f4;--text:#12161b;--muted:#66707a;--line:#dde2e7;--accent:#111827;--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.shell{width:min(1180px,calc(100% - 40px));margin:0 auto}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:30;border-bottom:1px solid rgba(221,226,231,.9);background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.header-inner{height:68px;display:flex;align-items:center;justify-content:space-between}.brand{display:inline-flex;align-items:center;gap:10px}.brand-mark{display:grid;width:34px;height:34px;place-items:center;border-radius:9px;background:var(--accent);color:white;font-weight:750}.brand 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