:root{--bg:#F1F6FE;--surface:#fff;--soft:#F5F8FE;--brand:#4A9FF2;--brand2:#3F94EC;--text:#66769F;--muted:#8794B5;--border:#E4EAF5;--shadow:0 10px 28px rgba(65,115,180,.10);--radius:16px}*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{margin:0;padding:0;overflow-x:hidden}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{font:inherit}.container{width:min(1220px,calc(100% - 36px));margin:auto}.site-header{position:sticky;top:0;z-index:9999;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.header-inner{height:72px;width:min(1220px,calc(100% - 28px));margin:auto;display:flex;align-items:center;gap:24px}.brand-logo{width:146px;flex:0 0 auto}.brand-logo 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