:root{--link:#3366cc;--link-visited:#795cb2;--link-red:#d33;--border:#a2a9b1;--border-light:#c8ccd1;--border-blue:#a7d7f9;--bg-page:#f6f6f6;--bg-content:#ffffff;--bg-soft:#f8f9fa;--text:#202122;--text-soft:#54595d;--font-body:"Helvetica Neue",Helvetica,Arial,"Liberation Sans",sans-serif;--font-head:"Linux Libertine",Georgia,"Times New Roman",Times,serif}*{box-sizing:border-box}html{font-size:100%}body{margin:0;background:var(--bg-page);color:var(--text);font-family:var(--font-body);font-size:.875rem;line-height:1.6}a{color:var(--link);text-decoration:none}a:visited{color:var(--link-visited)}a:hover{text-decoration:underline}a.new,a.new:visited{color:var(--link-red)}a.external{color:#36b}a.external:after{content:"\2197";font-size:.75em;padding-left:1px;color:#72777d}.personal-bar{background:var(--bg-page);padding:.35rem 1rem .2rem;text-align:right;font-size:.75rem;line-height:1.9}.personal-bar ul{list-style:none;margin:0;padding:0}.personal-bar li{display:inline-block;margin-left:.85rem}.personal-bar .user-name{font-weight:700}.personal-bar .user-name:before{content:"";display:inline-block;width:12px;height:13px;margin-right:4px;vertical-align:-2px;background:#72777d;-webkit-clip-path:polygon(50% 0,68% 22%,50% 44%,32% 22%,100% 100%,0 100%);clip-path:polygon(50% 0,68% 22%,50% 44%,32% 22%,100% 100%,0 100%);opacity:.55}.layout{display:grid;grid-template-columns:11.5rem minmax(0,1fr);grid-gap:0;gap:0;align-items:start;padding:0 1rem 2rem;max-width:1260px;margin:0 auto}.sidebar{padding:.25rem .6rem 2rem 0}.logo{display:block;margin:0 0 1.1rem;text-align:center}.logo img{width:84px;height:84px}.logo .wordmark{display:block;font-family:var(--font-head);font-size:1.05rem;color:var(--text);line-height:1.2;margin-top:.3rem}.logo .wordmark small{display:block;font-family:var(--font-body);font-size:.625rem;color:var(--text-soft);letter-spacing:.02em}.portlet{margin-bottom:1.1rem}.portlet h3{font-size:.6875rem;font-weight:400;color:#54595d;margin:0 0 .25rem;padding-left:.4rem;border-bottom:1px solid var(--border-light);text-transform:lowercase;font-feature-settings:"smcp";font-variant:small-caps}.portlet ul{list-style:none;margin:0;padding:0 0 0 .4rem}.portlet li{font-size:.75rem;line-height:1.85}.search-box{margin-bottom:1.1rem;padding-left:.4rem}.search-box input{width:100%;padding:.28rem .35rem;border:1px solid var(--border-light);border-radius:2px;font-size:.75rem;font-family:inherit;background:#fff}.tabs{justify-content:space-between;align-items:flex-end;gap:1rem;padding:0 0 0 .15rem;border-bottom:1px solid var(--border-blue);flex-wrap:wrap}.tabs,.tabs ul{display:flex;margin:0}.tabs ul{list-style:none;padding:0}.tabs li{margin:0 -1px 0 0}.tabs a,.tabs span.tab-inactive{display:block;padding:.3rem .7rem .25rem;font-size:.75rem;background:#f0f0f0;border:1px solid var(--border-blue);border-bottom:none;color:var(--link)}.tabs li.selected a,.tabs li.selected span.tab-inactive{background:var(--bg-content);color:var(--text);font-weight:400;padding-bottom:.3rem;margin-bottom:-1px}.tabs span.tab-inactive{color:#72777d;cursor:default}.content-area{min-width:0}.content{background:var(--bg-content);border:1px solid var(--border-blue);border-top:none;padding:1rem 1.4rem 1.6rem;overflow-wrap:anywhere}.first-heading{font-family:var(--font-head);font-size:1.75rem;font-weight:400;line-height:1.3;margin:.1rem 0;padding-bottom:.15rem;border-bottom:1px solid var(--border)}.short-description{color:var(--text-soft);font-size:.8125rem;margin:.25rem 0 1rem}.content .section-heading,.content h2{font-family:var(--font-head);font-size:1.375rem;font-weight:400;margin:1.4rem 0 .4rem;padding-bottom:.15rem;border-bottom:1px solid var(--border)}.content h3{font-size:1.0625rem;font-family:var(--font-head);margin:1.1rem 0 .3rem}.content p{margin:.5rem 0 .85rem}.content ol,.content ul{margin:.4rem 0 .9rem;padding-left:1.6rem}.content li{margin:.15rem 0}.section-header{display:flex;align-items:baseline;justify-content:space-between;gap:1rem}.section-header h2{flex:1 1}.editsection{font-size:.75rem;white-space:nowrap;padding-bottom:.2rem}.editsection:before{content:"[";color:var(--text-soft)}.editsection:after{content:"]";color:var(--text-soft)}sup.reference{font-size:.7em;line-height:1}sup.cn{font-size:.75em}sup.cn,sup.cn a{color:var(--link-red)}ol.references{font-size:.8125rem}ol.references li{margin-bottom:.2rem}.hatnote{color:var(--text-soft);font-style:italic;padding-left:1.6rem;margin:.3rem 0 .6rem}.hatnote,.notice{font-size:.8125rem}.notice{border:1px solid var(--border-light);border-left:6px solid #36c;background:var(--bg-soft);padding:.5rem .75rem;margin:.6rem 0 1rem}.notice.saved{border-left-color:#14866d}.infobox{float:right;clear:right;width:21.5rem;max-width:100%;margin:0 0 1rem 1.2rem;border:1px solid var(--border);background:var(--bg-soft);font-size:.8125rem;line-height:1.5}.infobox .infobox-title{font-family:var(--font-head);font-size:1.05rem;text-align:center;padding:.4rem .5rem .15rem;font-weight:700}.infobox .infobox-subtitle{text-align:center;font-size:.75rem;color:var(--text-soft);padding:0 .5rem .4rem;border-bottom:1px solid var(--border-light)}.infobox figure{margin:0;padding:.5rem}.infobox figure img{width:100%;height:auto;display:block;border:1px solid var(--border-light);background:#fff}.infobox figcaption{font-size:.6875rem;color:var(--text-soft);padding-top:.3rem;line-height:1.4}.infobox table{width:100%;border-collapse:collapse}.infobox th{text-align:left;vertical-align:top;width:7.5rem;font-weight:700}.infobox td,.infobox th{padding:.25rem .4rem;border-top:1px solid var(--border-light)}.infobox .split{display:block}.infobox .split+.split{margin-top:.2rem;padding-top:.2rem;border-top:1px dotted var(--border-light)}.toc{display:table;border:1px solid var(--border-light);background:var(--bg-soft);padding:.5rem 1.1rem .6rem .7rem;margin:.8rem 0 1rem;font-size:.8125rem}.toc .toctitle{font-weight:700;text-align:center;margin-bottom:.2rem}.toc ol{list-style:none;counter-reset:toc;margin:0;padding-left:.2rem}.toc li{counter-increment:toc;margin:.1rem 0}.toc li:before{content:counter(toc) " ";color:var(--text-soft)}table.wikitable{border-collapse:collapse;width:100%;font-size:.8125rem;margin:.6rem 0 1rem}table.wikitable td,table.wikitable th{border:1px solid var(--border-light);padding:.3rem .5rem;text-align:left;vertical-align:top}table.wikitable th{background:var(--bg-soft);font-weight:700}ul.changes{list-style:none;padding:0;margin:.6rem 0;font-size:.8125rem}ul.changes li{padding:.22rem 0;border-bottom:1px dotted #e4e6e8}.changes .minor{color:#72777d;font-weight:700}.changes .pos{color:#14866d;font-weight:700}.changes .neg{color:#d33;font-weight:700}.changes .summary{color:var(--text-soft);font-style:italic}.changes .ts{color:#72777d}.prefs-tabs{display:flex;gap:0;margin:.8rem 0 0;border-bottom:1px solid var(--border);flex-wrap:wrap}.prefs-tabs a,.prefs-tabs span{padding:.35rem .85rem;font-size:.8125rem;border:1px solid var(--border);border-bottom:none;background:var(--bg-soft);color:var(--link);margin-right:2px}.prefs-tabs .active{background:#fff;color:var(--text);font-weight:700;margin-bottom:-1px}fieldset.prefs{border:1px solid var(--border-light);padding:.6rem 1rem 1rem;margin:1.1rem 0}fieldset.prefs legend{font-weight:700;padding:0 .35rem;font-size:.875rem}.pref-row{display:flex;gap:1rem;padding:.32rem 0;align-items:baseline;flex-wrap:wrap}.pref-row .pref-label{width:11rem;flex-shrink:0;color:var(--text-soft)}.pref-row .pref-value{flex:1 1;min-width:12rem}.pref-row .pref-value input[type=text]{width:100%;max-width:26rem;padding:.28rem .4rem;border:1px solid var(--border-light);font-family:inherit;font-size:.8125rem;background:#fff;color:var(--text)}.pref-note{margin:.15rem 0 .4rem 12rem}.pref-note,.pref-private{font-size:.75rem;color:var(--text-soft)}.pref-private{background:var(--bg-soft);border-left:3px solid var(--border);padding:.3rem .6rem;margin:.5rem 0 0}.edit-form textarea{width:100%;min-height:26rem;font-family:monospace,monospace;font-size:.8125rem;line-height:1.5;padding:.5rem;background:#fff;color:var(--text)}.edit-form textarea,.edit-toolbar{border:1px solid var(--border-light)}.edit-toolbar{border-bottom:none;background:var(--bg-soft);padding:.3rem .5rem;font-size:.75rem;color:var(--text-soft)}.edit-summary{margin:.7rem 0 .4rem}.edit-summary label{display:block;font-size:.8125rem;margin-bottom:.2rem}.edit-summary input{width:100%;padding:.32rem .4rem;border:1px solid var(--border-light);font-family:inherit;font-size:.8125rem;background:#fff}.edit-checks{font-size:.8125rem;margin:.35rem 0 .7rem}.edit-buttons{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}button.primary,button.secondary{font-family:inherit;font-size:.8125rem;padding:.42rem .9rem;min-height:2.75rem;border-radius:2px;cursor:pointer}button.primary{background:#36c;border:1px solid #36c;color:#fff;font-weight:700}button.primary:hover{background:#447ff5}button.secondary{background:#f8f9fa;border:1px solid var(--border);color:var(--text)}button.secondary:hover{background:#fff}.edit-license{font-size:.75rem;color:var(--text-soft);margin-top:.7rem;line-height:1.5}.talk-comment{margin:.3rem 0 .9rem}.talk-comment.reply{margin-left:2rem}.talk-signature{color:var(--text-soft);font-size:.8125rem}.catlinks{border:1px solid var(--border-light);background:var(--bg-soft);padding:.4rem .6rem;margin-top:1.6rem;font-size:.8125rem}.catlinks ul{list-style:none;display:inline;margin:0;padding:0}.catlinks li{display:inline;border-left:1px solid var(--border-light);padding:0 .4rem}.catlinks li:first-child{border-left:none}.site-footer{max-width:1260px;margin:0 auto;padding:1rem 1rem 2.5rem;font-size:.75rem;color:var(--text-soft);border-top:1px solid var(--border-light)}.site-footer ul{list-style:none;margin:.5rem 0 0;padding:0}.site-footer li{display:inline-block;margin-right:1rem}.last-edited{font-size:.75rem;color:var(--text-soft);margin-top:1.2rem}@media (max-width:850px){.layout{grid-template-columns:1fr;padding:0 .5rem 1.5rem}.sidebar{padding:.5rem 0}.logo{text-align:left;display:flex;align-items:center;gap:.6rem}.logo img{width:42px;height:42px}.logo .wordmark{margin-top:0;text-align:left}.portlet{display:inline-block;vertical-align:top;margin-right:1.5rem}.content{padding:.8rem .9rem 1.2rem}.infobox{float:none;width:100%;margin:.8rem 0}.first-heading{font-size:1.5rem}.personal-bar{text-align:left;padding-left:.5rem}.personal-bar li{margin:0 .85rem 0 0}.pref-row .pref-label{width:100%}.pref-note{margin-left:0}}