:root{--bg:#f7f9fc;--surface:#fff;--ink:#15243b;--muted:#607086;--line:#e3eaf2;--accent:#2469d8;--soft:#eaf2ff;--teal:#0f9488}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button{cursor:pointer}.shell{max-width:1160px;margin:auto;padding:0 26px}.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav{height:74px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{font-weight:850;font-size:23px;letter-spacing:-1px}.brand span{color:var(--accent)}.links{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.navbtn{background:transparent;border:0;border-radius:10px;padding:10px 13px;color:#51627a;font-weight:650}.navbtn.active,.navbtn:hover{background:var(--soft);color:var(--accent)}.btn{background:var(--accent);border:1px 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