:root{--black:#05070b;--ink:#111827;--muted:#667085;--line:#e5e7eb;--soft:#f5f7fb;--blue:#002fa7;--blue2:#1f62ff;--green:#9cff3b;--white:#fff;--gray:#d0d5dd;--shadow:0 24px 70px rgba(5,7,11,.12);--radius:28px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--ink);line-height:1.75}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button,input,textarea,select{font:inherit}.container{width:min(1180px,calc(100% - 40px));margin-inline:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(16px);border-bottom:1px solid 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