:root{--bg:#F2F7FD;--white:#FFFFFF;--soft:#EDF5FD;--soft2:#E7F1FB;--title:#2D79D8;--brand:#168DFF;--nav:#5E6E8D;--text:#33445F;--muted:#687995;--note:#8D9AB2;--cyan:#35BFF0;--footer:#344564;--shadow:0 12px 32px rgba(68,106,153,.10);--line:rgba(72,120,176,.12);--grad:linear-gradient(180deg,#39D6F4 0%,#1EBDEB 48%,#168DFF 100%)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:#fff;backdrop-filter:blur(10px);box-shadow:0 6px 20px rgba(68,106,153,.10)}.header-inner{max-width:1240px;margin:0 auto;height:76px;padding:0 20px;display:flex;align-items:center;gap:18px}.logo 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