: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;--header:72px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}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;overflow-x:hidden}html.menu-open,body.menu-open{overflow:hidden}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.container{width:min(1220px,calc(100% - 40px));margin:0 auto}.skip-link{position:fixed;left:12px;top:-80px;background:#fff;color:var(--brand);padding:10px 14px;border-radius:10px;z-index:12000}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:9999;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid 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