:root{--bg:#f5fbff;--white:#fff;--soft:#eaf7fc;--pale:#dff5fb;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--title:#173b60;--body:#2d4359;--muted:#687f93;--line:#dcebf3;--shadow:0 16px 48px rgba(19,74,112,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:var(--navy);text-decoration:none}a:hover{color:var(--blue)}button{font:inherit;cursor:pointer}img{max-width:100%}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:60}.header-inner{min-height:72px;display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;flex-shrink:0;min-width:145px}.brand 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