:root{--bg:#F3F6F9;--surface:#fff;--soft:#E8EEF5;--ink:#0B1220;--body:#1E293B;--muted:#475569;--helper:#64748B;--blue:#2563EB;--blue-lite:#60A5FA;--blue-deep:#1D4ED8;--lime:#65A30D;--slate:#334155;--line:rgba(37,99,235,.16);--shadow:0 14px 36px rgba(11,18,32,.08);--radius:18px;--header-h:136px;--shell:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg)}body{margin:0;background:var(--bg);color:var(--body);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}body.scroll-locked{overflow:hidden}a{color:inherit;text-decoration:none}a,button{outline:none}a:focus-visible,button:focus-visible{outline:3px solid rgba(37,99,235,.32);outline-offset:3px}img{display:block;max-width:100%;height:auto}.shell{width:min(calc(100% - 32px),var(--shell));margin-inline:auto}.skip-link{position:fixed;top:8px;left:8px;z-index:200;background:#fff;color:var(--ink);padding:8px 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