:root{--bg:#fff;--sub:#f5f8ff;--soft:#eaf0ff;--gray:#f7f7f8;--ink:#1a1f2e;--text:#333847;--muted:#667085;--faint:#98a2b3;--blue:#4f6ef7;--bright:#6b8aff;--indigo:#3b5bdb;--deep:#2a3f9d;--line:rgba(79,110,247,.14);--grayline:rgba(0,0,0,.08);--shadow:0 14px 40px rgba(30,40,80,.08);--bshadow:0 16px 42px rgba(79,110,247,.14);--radius:22px;--max:1280px}*{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;overflow-x:hidden}body.panel-open{overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit}.skip-link{position:fixed;left:16px;top:-80px;z-index:9999;background:var(--ink);color:#fff;padding:10px 16px;border-radius:12px}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(16px);border-bottom:1px solid 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@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}