:root{--bg:#ffffff;--ink:#111827;--muted:#5d697a;--line:#dbe3ee;--line-strong:#b7c6da;--blue:#0b57d0;--blue-strong:#0743a5;--blue-soft:#eaf3ff;--green:#12a66a;--orange:#ef7d1a;--graphite:#0c1724;--panel:#f8fbff;--shadow:0 18px 48px rgba(14,42,84,0.1);--radius:8px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,Segoe UI,PingFang SC,Microsoft YaHei,Arial,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}img{max-width:100%;height:auto}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:40;height:76px;display:flex;align-items:center;gap:28px;padding:0 clamp(20px,5vw,72px);border-bottom:1px solid rgba(219,227,238,.9);background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.brand,.footer-brand{display:inline-flex;align-items:center;gap:12px;min-width:238px}.brand strong,.footer-brand 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