@charset "UTF-8";h1>small,h2>small,h3>small,h4>small{font-size:60%}h1 a:hover,h2 a:hover,h3 a:hover,h4 a:hover{text-decoration:none}.comment-count{margin-left:15px}.pagination li{padding:0 5px}.content summary{border-radius:1rem;padding-left:1rem}h1 code,h2 code,h3 code,h4 code{font-size:inherit}code{hyphens:none}.content .featured-image{text-align:center}.featured-image img,.content article figure img{border-radius:1rem;object-fit:contain;margin-left:auto;margin-right:auto;max-width:100%}div.littlefoot-footnote__wrapper>div>p{text-align:left;color:#212121}article .note-box>h6{margin-top:1rem;margin-bottom:1rem;padding-top:10px;padding-left:2rem}article .note-box>p{margin-top:0;margin-bottom:0;padding-left:2rem;padding-right:2rem}div.note-box{border-left:.5rem;border-left-style:solid;padding-bottom:1rem;margin-left:auto;margin-right:auto;width:90%;margin-bottom:1rem;margin-top:1rem;border-radius:1rem}@media only screen and (max-width:600px){div.note-box{width:100%}}div.addendum{border-left-color:#1565c0}div.warning{border-left-color:#fece31}div.problem{border-left-color:#de1919}div.maintenance{border:.5rem solid #fece31}figure.code{text-align:left}.gh-repo a{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.rpkg{white-space:nowrap}.rpkg a{font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.tooltip{font-family:-apple-system,BlinkMacSystemFont,segoe ui,Roboto,Oxygen-Sans,Ubuntu,Cantarell,helvetica neue,Helvetica,游ゴシック,pingfang sc,STXihei,华文细黑,microsoft yahei,微软雅黑,SimSun,宋体,Heiti,黑体,sans-serif;visibility:hidden;width:auto;background-color:#424242;color:#dadada;text-align:center;padding:1rem;border-radius:1rem;position:fixed;bottom:5%;right:5%;z-index:3}.rpkg:hover .tooltip,.rpkg:focus-within .tooltip,.rpkg:focus .tooltip,.rpkg:active .tooltip{visibility:visible}.rpkg i{font-size:80%}.content video{margin-left:auto;margin-right:auto;max-width:100%;border-radius:1rem}body.colorscheme-dark{}body.colorscheme-dark .chroma .err{color:#960050;background-color:#1e0010}body.colorscheme-dark .chroma .lntd{vertical-align:top;padding:0;margin:0;border:0}body.colorscheme-dark .chroma .lntable{border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block}body.colorscheme-dark .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-dark .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-dark .chroma .kn{color:#f92672}body.colorscheme-dark .chroma .nt{color:#f92672}body.colorscheme-dark .chroma .l{color:#ae81ff}body.colorscheme-dark .chroma .m{color:#ae81ff}body.colorscheme-dark .chroma .mb{color:#ae81ff}body.colorscheme-dark .chroma .mf{color:#ae81ff}body.colorscheme-dark .chroma .mh{color:#ae81ff}body.colorscheme-dark .chroma .mi{color:#ae81ff}body.colorscheme-dark .chroma .il{color:#ae81ff}body.colorscheme-dark .chroma .mo{color:#ae81ff}body.colorscheme-dark .chroma .ow{color:#f92672}body.colorscheme-dark .chroma .c{color:#75715e}body.colorscheme-dark .chroma .ch{color:#75715e}body.colorscheme-dark .chroma .cm{color:#75715e}body.colorscheme-dark .chroma .c1{color:#75715e}body.colorscheme-dark .chroma .cs{color:#75715e}body.colorscheme-dark .chroma .cp{color:#75715e}body.colorscheme-dark .chroma .cpf{color:#75715e}body.colorscheme-dark .chroma .ge{font-style:italic}body.colorscheme-dark .chroma .gs{font-weight:700}body.colorscheme-dark .chroma{color:#f8f8f2;background-color:#1d1d1d}body.colorscheme-dark .chroma .hl{display:block;width:100%;background-color:#484828}body.colorscheme-dark .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-dark .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-dark .chroma .k{color:#66d9ef}body.colorscheme-dark .chroma .kc{color:#66d9ef}body.colorscheme-dark .chroma .kd{color:#66d9ef}body.colorscheme-dark .chroma .kp{color:#66d9ef}body.colorscheme-dark .chroma .kr{color:#66d9ef}body.colorscheme-dark .chroma .kt{color:#66d9ef}body.colorscheme-dark .chroma .na{color:#a6e22e}body.colorscheme-dark .chroma .nc{color:#a6e22e}body.colorscheme-dark .chroma .no{color:#66d9ef}body.colorscheme-dark .chroma .nd{color:#a6e22e}body.colorscheme-dark .chroma .ne{color:#a6e22e}body.colorscheme-dark .chroma .nf{color:#a6e22e}body.colorscheme-dark .chroma .nx{color:#a6e22e}body.colorscheme-dark .chroma .ld{color:#e6db74}body.colorscheme-dark .chroma .s{color:#e6db74}body.colorscheme-dark .chroma .sa{color:#e6db74}body.colorscheme-dark .chroma .sb{color:#e6db74}body.colorscheme-dark .chroma .sc{color:#e6db74}body.colorscheme-dark .chroma .dl{color:#e6db74}body.colorscheme-dark .chroma .sd{color:#e6db74}body.colorscheme-dark .chroma .s2{color:#e6db74}body.colorscheme-dark .chroma .se{color:#ae81ff}body.colorscheme-dark .chroma .sh{color:#e6db74}body.colorscheme-dark .chroma .si{color:#e6db74}body.colorscheme-dark .chroma .sx{color:#e6db74}body.colorscheme-dark .chroma .sr{color:#e6db74}body.colorscheme-dark .chroma .s1{color:#e6db74}body.colorscheme-dark .chroma .ss{color:#e6db74}body.colorscheme-dark .chroma .o{color:#fb2976}body.colorscheme-dark .chroma .gd{color:#f92672}body.colorscheme-dark .chroma .gi{color:#a6e22e}body.colorscheme-dark .chroma .gu{color:#75715e}body.colorscheme-dark code{background-color:#1d1d1d}body.colorscheme-dark a code{color:#42a5f5}body.colorscheme-dark mjx-container{background-color:#212121;border:0;color:#dadada}body.colorscheme-dark .littlefoot-footnote__button{color:#dadada}body.colorscheme-dark div.note-box{background-color:#171717}body.colorscheme-dark .content summary{background-color:#1d1d1d}@media(prefers-color-scheme:dark){body.colorscheme-auto{}body.colorscheme-auto .chroma .err{color:#960050;background-color:#1e0010}body.colorscheme-auto .chroma .lntd{vertical-align:top;padding:0;margin:0;border:0}body.colorscheme-auto .chroma .lntable{border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block}body.colorscheme-auto .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .kn{color:#f92672}body.colorscheme-auto .chroma .nt{color:#f92672}body.colorscheme-auto .chroma .l{color:#ae81ff}body.colorscheme-auto .chroma .m{color:#ae81ff}body.colorscheme-auto .chroma .mb{color:#ae81ff}body.colorscheme-auto .chroma .mf{color:#ae81ff}body.colorscheme-auto .chroma .mh{color:#ae81ff}body.colorscheme-auto .chroma .mi{color:#ae81ff}body.colorscheme-auto .chroma .il{color:#ae81ff}body.colorscheme-auto .chroma .mo{color:#ae81ff}body.colorscheme-auto .chroma .ow{color:#f92672}body.colorscheme-auto .chroma .c{color:#75715e}body.colorscheme-auto .chroma .ch{color:#75715e}body.colorscheme-auto .chroma .cm{color:#75715e}body.colorscheme-auto .chroma .c1{color:#75715e}body.colorscheme-auto .chroma .cs{color:#75715e}body.colorscheme-auto .chroma .cp{color:#75715e}body.colorscheme-auto .chroma .cpf{color:#75715e}body.colorscheme-auto .chroma .ge{font-style:italic}body.colorscheme-auto .chroma .gs{font-weight:700}body.colorscheme-auto .chroma{color:#f8f8f2;background-color:#1d1d1d}body.colorscheme-auto .chroma .hl{display:block;width:100%;background-color:#484828}body.colorscheme-auto .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .k{color:#66d9ef}body.colorscheme-auto .chroma .kc{color:#66d9ef}body.colorscheme-auto .chroma .kd{color:#66d9ef}body.colorscheme-auto .chroma .kp{color:#66d9ef}body.colorscheme-auto .chroma .kr{color:#66d9ef}body.colorscheme-auto .chroma .kt{color:#66d9ef}body.colorscheme-auto .chroma .na{color:#a6e22e}body.colorscheme-auto .chroma .nc{color:#a6e22e}body.colorscheme-auto .chroma .no{color:#66d9ef}body.colorscheme-auto .chroma .nd{color:#a6e22e}body.colorscheme-auto .chroma .ne{color:#a6e22e}body.colorscheme-auto .chroma .nf{color:#a6e22e}body.colorscheme-auto .chroma .nx{color:#a6e22e}body.colorscheme-auto .chroma .ld{color:#e6db74}body.colorscheme-auto .chroma .s{color:#e6db74}body.colorscheme-auto .chroma .sa{color:#e6db74}body.colorscheme-auto .chroma .sb{color:#e6db74}body.colorscheme-auto .chroma .sc{color:#e6db74}body.colorscheme-auto .chroma .dl{color:#e6db74}body.colorscheme-auto .chroma .sd{color:#e6db74}body.colorscheme-auto .chroma .s2{color:#e6db74}body.colorscheme-auto .chroma .se{color:#ae81ff}body.colorscheme-auto .chroma .sh{color:#e6db74}body.colorscheme-auto .chroma .si{color:#e6db74}body.colorscheme-auto .chroma .sx{color:#e6db74}body.colorscheme-auto .chroma .sr{color:#e6db74}body.colorscheme-auto .chroma .s1{color:#e6db74}body.colorscheme-auto .chroma .ss{color:#e6db74}body.colorscheme-auto .chroma .o{color:#fb2976}body.colorscheme-auto .chroma .gd{color:#f92672}body.colorscheme-auto .chroma .gi{color:#a6e22e}body.colorscheme-auto .chroma .gu{color:#75715e}body.colorscheme-auto code{background-color:#1d1d1d}body.colorscheme-auto a code{color:#42a5f5}body.colorscheme-auto mjx-container{background-color:#212121;border:0;color:#dadada}body.colorscheme-auto .littlefoot-footnote__button{color:#dadada}body.colorscheme-auto div.note-box{background-color:#171717}body.colorscheme-auto .content summary{background-color:#1d1d1d}}body.colorscheme-light{}body.colorscheme-light .chroma .err{color:#960050;background-color:#1e0010}body.colorscheme-light .chroma .lntd{vertical-align:top;padding:0;margin:0;border:0}body.colorscheme-light .chroma .lntable{border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block}body.colorscheme-light .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-light .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-light .chroma .kn{color:#f92672}body.colorscheme-light .chroma .nt{color:#f92672}body.colorscheme-light .chroma .l{color:#ae81ff}body.colorscheme-light .chroma .m{color:#ae81ff}body.colorscheme-light .chroma .mb{color:#ae81ff}body.colorscheme-light .chroma .mf{color:#ae81ff}body.colorscheme-light .chroma .mh{color:#ae81ff}body.colorscheme-light .chroma .mi{color:#ae81ff}body.colorscheme-light .chroma .il{color:#ae81ff}body.colorscheme-light .chroma .mo{color:#ae81ff}body.colorscheme-light .chroma .ow{color:#f92672}body.colorscheme-light .chroma .c{color:#75715e}body.colorscheme-light .chroma .ch{color:#75715e}body.colorscheme-light .chroma .cm{color:#75715e}body.colorscheme-light .chroma .c1{color:#75715e}body.colorscheme-light .chroma .cs{color:#75715e}body.colorscheme-light .chroma .cp{color:#75715e}body.colorscheme-light .chroma .cpf{color:#75715e}body.colorscheme-light .chroma .ge{font-style:italic}body.colorscheme-light .chroma .gs{font-weight:700}body.colorscheme-light .chroma{color:#272822;background-color:#f3f3f3}body.colorscheme-light .chroma .hl{display:block;width:100%;background-color:#ffc}body.colorscheme-light .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-light .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-light .chroma .k{color:#00a8c8}body.colorscheme-light .chroma .kc{color:#00a8c8}body.colorscheme-light .chroma .kd{color:#00a8c8}body.colorscheme-light .chroma .kp{color:#00a8c8}body.colorscheme-light .chroma .kr{color:#00a8c8}body.colorscheme-light .chroma .kt{color:#00a8c8}body.colorscheme-light .chroma .n{color:#111}body.colorscheme-light .chroma .na{color:#75af00}body.colorscheme-light .chroma .nb{color:#111}body.colorscheme-light .chroma .bp{color:#111}body.colorscheme-light .chroma .nc{color:#75af00}body.colorscheme-light .chroma .no{color:#00a8c8}body.colorscheme-light .chroma .nd{color:#75af00}body.colorscheme-light .chroma .ni{color:#111}body.colorscheme-light .chroma .ne{color:#75af00}body.colorscheme-light .chroma .nf{color:#75af00}body.colorscheme-light .chroma .fm{color:#111}body.colorscheme-light .chroma .nl{color:#111}body.colorscheme-light .chroma .nn{color:#111}body.colorscheme-light .chroma .nx{color:#75af00}body.colorscheme-light .chroma .py{color:#111}body.colorscheme-light .chroma .nv{color:#111}body.colorscheme-light .chroma .vc{color:#111}body.colorscheme-light .chroma .vg{color:#111}body.colorscheme-light .chroma .vi{color:#111}body.colorscheme-light .chroma .vm{color:#111}body.colorscheme-light .chroma .ld{color:#d88200}body.colorscheme-light .chroma .s{color:#d88200}body.colorscheme-light .chroma .sa{color:#d88200}body.colorscheme-light .chroma .sb{color:#d88200}body.colorscheme-light .chroma .sc{color:#d88200}body.colorscheme-light .chroma .dl{color:#d88200}body.colorscheme-light .chroma .sd{color:#d88200}body.colorscheme-light .chroma .s2{color:#d88200}body.colorscheme-light .chroma .se{color:#8045ff}body.colorscheme-light .chroma .sh{color:#d88200}body.colorscheme-light .chroma .si{color:#d88200}body.colorscheme-light .chroma .sx{color:#d88200}body.colorscheme-light .chroma .sr{color:#d88200}body.colorscheme-light .chroma .s1{color:#d88200}body.colorscheme-light .chroma .ss{color:#d88200}body.colorscheme-light .chroma .o{color:#f92672}body.colorscheme-light .chroma .p{color:#111}body.colorscheme-light code{background-color:#f3f3f3}body.colorscheme-light a code{color:#1565c0}body.colorscheme-light mjx-container{background-color:#fafafa;border:0}body.colorscheme-light .littlefoot-footnote__button{color:#3b3b3b}body.colorscheme-light div.note-box{background-color:#f0f0f0}body.colorscheme-light .content summary{background-color:#f3f3f3}@media(prefers-color-scheme:light){body.colorscheme-auto{}body.colorscheme-auto .chroma .err{color:#960050;background-color:#1e0010}body.colorscheme-auto .chroma .lntd{vertical-align:top;padding:0;margin:0;border:0}body.colorscheme-auto .chroma .lntable{border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block}body.colorscheme-auto .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .kn{color:#f92672}body.colorscheme-auto .chroma .nt{color:#f92672}body.colorscheme-auto .chroma .l{color:#ae81ff}body.colorscheme-auto .chroma .m{color:#ae81ff}body.colorscheme-auto .chroma .mb{color:#ae81ff}body.colorscheme-auto .chroma .mf{color:#ae81ff}body.colorscheme-auto .chroma .mh{color:#ae81ff}body.colorscheme-auto .chroma .mi{color:#ae81ff}body.colorscheme-auto .chroma .il{color:#ae81ff}body.colorscheme-auto .chroma .mo{color:#ae81ff}body.colorscheme-auto .chroma .ow{color:#f92672}body.colorscheme-auto .chroma .c{color:#75715e}body.colorscheme-auto .chroma .ch{color:#75715e}body.colorscheme-auto .chroma .cm{color:#75715e}body.colorscheme-auto .chroma .c1{color:#75715e}body.colorscheme-auto .chroma .cs{color:#75715e}body.colorscheme-auto .chroma .cp{color:#75715e}body.colorscheme-auto .chroma .cpf{color:#75715e}body.colorscheme-auto .chroma .ge{font-style:italic}body.colorscheme-auto .chroma .gs{font-weight:700}body.colorscheme-auto .chroma{color:#272822;background-color:#f3f3f3}body.colorscheme-auto .chroma .hl{display:block;width:100%;background-color:#ffc}body.colorscheme-auto .chroma .lnt{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .ln{margin-right:.4em;padding:0 .4em;color:#7f7f7f}body.colorscheme-auto .chroma .k{color:#00a8c8}body.colorscheme-auto .chroma .kc{color:#00a8c8}body.colorscheme-auto .chroma .kd{color:#00a8c8}body.colorscheme-auto .chroma .kp{color:#00a8c8}body.colorscheme-auto .chroma .kr{color:#00a8c8}body.colorscheme-auto .chroma .kt{color:#00a8c8}body.colorscheme-auto .chroma .n{color:#111}body.colorscheme-auto .chroma .na{color:#75af00}body.colorscheme-auto .chroma .nb{color:#111}body.colorscheme-auto .chroma .bp{color:#111}body.colorscheme-auto .chroma .nc{color:#75af00}body.colorscheme-auto .chroma .no{color:#00a8c8}body.colorscheme-auto .chroma .nd{color:#75af00}body.colorscheme-auto .chroma .ni{color:#111}body.colorscheme-auto .chroma .ne{color:#75af00}body.colorscheme-auto .chroma .nf{color:#75af00}body.colorscheme-auto .chroma .fm{color:#111}body.colorscheme-auto .chroma .nl{color:#111}body.colorscheme-auto .chroma .nn{color:#111}body.colorscheme-auto .chroma .nx{color:#75af00}body.colorscheme-auto .chroma .py{color:#111}body.colorscheme-auto .chroma .nv{color:#111}body.colorscheme-auto .chroma .vc{color:#111}body.colorscheme-auto .chroma .vg{color:#111}body.colorscheme-auto .chroma .vi{color:#111}body.colorscheme-auto .chroma .vm{color:#111}body.colorscheme-auto .chroma .ld{color:#d88200}body.colorscheme-auto .chroma .s{color:#d88200}body.colorscheme-auto .chroma .sa{color:#d88200}body.colorscheme-auto .chroma .sb{color:#d88200}body.colorscheme-auto .chroma .sc{color:#d88200}body.colorscheme-auto .chroma .dl{color:#d88200}body.colorscheme-auto .chroma .sd{color:#d88200}body.colorscheme-auto .chroma .s2{color:#d88200}body.colorscheme-auto .chroma .se{color:#8045ff}body.colorscheme-auto .chroma .sh{color:#d88200}body.colorscheme-auto .chroma .si{color:#d88200}body.colorscheme-auto .chroma .sx{color:#d88200}body.colorscheme-auto .chroma .sr{color:#d88200}body.colorscheme-auto .chroma .s1{color:#d88200}body.colorscheme-auto .chroma .ss{color:#d88200}body.colorscheme-auto .chroma .o{color:#f92672}body.colorscheme-auto .chroma .p{color:#111}body.colorscheme-auto code{background-color:#f3f3f3}body.colorscheme-auto a code{color:#1565c0}body.colorscheme-auto mjx-container{background-color:#fafafa;border:0}body.colorscheme-auto .littlefoot-footnote__button{color:#3b3b3b}body.colorscheme-auto div.note-box{background-color:#f0f0f0}body.colorscheme-auto .content summary{background-color:#f3f3f3}}