:root{--bg:#F3F6F9;--paper:#fff;--soft:#E8EEF5;--ink:#0B1220;--text:#1E293B;--muted:#475569;--subtle:#64748B;--blue:#2563EB;--light-blue:#60A5FA;--deep-blue:#1D4ED8;--lime:#65A30D;--slate:#334155;--border:rgba(37,99,235,.16);--shadow:0 14px 36px rgba(11,18,32,.08);--radius:18px;--max:1180px}*{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","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}img{display:block;max-width:100%;height:auto}.shell{width:min(calc(100% - 32px),var(--max));margin-inline:auto}.skip-link{position:fixed;left:16px;top:-80px;z-index:120;background:var(--ink);color:#fff;padding:10px 14px;border-radius:10px}.skip-link:focus{top:12px}.site-header{position:fixed;inset:0 0 auto 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