:root{--bg:#071629;--panel:#0d213d;--panel2:#102a4f;--text:#eef6ff;--muted:#a9b9cc;--brand:#3b82f6;--brand2:#22d3ee;--line:rgba(255,255,255,.12);--white:#fff;--dark:#08111f}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.65}a{color:inherit;text-decoration:none}.container{width:min(1180px,92%);margin:auto}.site-header{position:sticky;top:0;z-index:10;background:rgba(7,22,41,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-wrap{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;font-weight:800}.brand 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