:root{--bg:#fff;--bg2:#f5f8ff;--bg3:#eaf0ff;--text:#1a1f2e;--body:#333847;--muted:#667085;--subtle:#98a2b3;--blue:#4f6ef7;--blue2:#6b8aff;--indigo:#3b5bdb;--deep:#2a3f9d;--line:rgba(79,110,247,.14);--shadow:0 14px 40px rgba(30,40,80,.08);--r:22px;--nav:74px;--max:1280px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}body.is-locked{overflow:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button,input{font:inherit}button{cursor:pointer}.skip-link{position:fixed;left:16px;top:-70px;z-index:999;background:#fff;padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.95);backdrop-filter:blur(16px);border-bottom:1px solid 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