:root{color-scheme:light;--ug-ink:#102033;--ug-muted:#607086;--ug-line:#dde5ef;--ug-orange:#ed5000;--ug-header:#061a2b}
*{box-sizing:border-box}html{scroll-behavior:smooth}body.ug-page{margin:0;background:#fff;color:var(--ug-ink);font:15px/1.7 "Segoe UI","Microsoft YaHei",Arial,sans-serif;letter-spacing:0}a{color:#0965c8;text-decoration:none}a:hover{text-decoration:underline}button,input,summary{font:inherit}button{cursor:pointer}button,a,input,summary{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #2482c4;outline-offset:3px}[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.4;overflow-wrap:anywhere}button{color:inherit}img{max-width:100%}
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.ug-skip{position:fixed;top:-100px;left:20px;z-index:100;background:#fff;padding:12px}.ug-skip:focus{top:12px}.ug-header{background:var(--ug-header);color:white}.ug-header-inner{max-width:1500px;margin:auto;min-height:68px;padding:0 32px;display:flex;align-items:center;gap:46px}.ug-brand{display:flex;align-items:center;gap:11px;color:#fff;white-space:nowrap;font-size:22px;line-height:1}.ug-brand:hover{text-decoration:none}.ug-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:7px;background:#ff5a00;color:white;font-weight:800;font-size:28px}.ug-site-nav{display:flex;align-items:center;gap:30px;margin-left:36px}.ug-site-nav a,.ug-return{color:white;font-size:14px;font-weight:600}.ug-return{margin-left:auto;display:flex;align-items:center;gap:6px}.ug-mobile-nav{display:none!important}
.ug-masthead{border-bottom:1px solid var(--ug-line)}.ug-masthead-inner{max-width:1500px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:28px;padding:30px 32px}.ug-breadcrumb{display:flex;flex-wrap:wrap;gap:10px;color:var(--ug-muted);font-size:13px;margin-bottom:8px}.ug-breadcrumb a{color:inherit}.ug-masthead h1{font-size:30px;margin-bottom:7px}.ug-meta{font-size:13px;color:var(--ug-muted);margin:0}.ug-toolbar{flex-shrink:0}.ug-toolbar-row{display:flex;gap:12px;align-items:start}.ug-language{position:relative;min-width:126px}.ug-language summary{display:flex;justify-content:space-between;gap:16px;align-items:center;cursor:pointer;list-style:none;border:1px solid #cbd6e3;border-radius:6px;padding:9px 12px;height:44px;font-size:14px;background:#fff}.ug-language summary::-webkit-details-marker{display:none}.ug-language nav{position:absolute;z-index:20;top:48px;right:0;min-width:150px;padding:5px;background:white;border:1px solid var(--ug-line);border-radius:6px;box-shadow:0 8px 24px #10203318}.ug-language a{display:flex;align-items:center;justify-content:space-between;padding:9px 10px;color:var(--ug-ink);font-size:14px}.ug-language a[aria-current]{color:var(--ug-orange);background:#fff4ec}.ug-language a:hover{background:#f3f6fa;text-decoration:none}.ug-download{display:flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--ug-orange);background:var(--ug-orange);color:#fff;border-radius:6px;min-height:44px;padding:8px 14px;font-size:14px;font-weight:650;white-space:nowrap}.ug-download:hover{background:#d44700;text-decoration:none}.ug-pdf-meta{display:flex;justify-content:flex-end;gap:13px;color:var(--ug-muted);font-size:12px;margin-top:7px}
.ug-reader{display:grid;grid-template-columns:280px minmax(0,1fr);max-width:1500px;min-height:calc(100vh - 228px);margin:auto}.ug-sidebar{border-right:1px solid var(--ug-line);background:#f8fafc;padding:24px 20px}.ug-toc{position:sticky;top:22px;max-height:calc(100vh - 44px);overflow:auto;scrollbar-width:thin;padding:3px}.ug-toc>h2{font-size:16px;margin:20px 0 8px}.ug-search{display:flex;align-items:center;gap:8px;padding:0 8px;border:1px solid #cbd6e3;background:white;border-radius:6px;height:42px;color:var(--ug-muted)}.ug-search input{border:0;background:none;min-width:0;width:100%;font-size:13px;color:var(--ug-ink);height:38px}.ug-search input::-webkit-search-cancel-button{-webkit-appearance:none}.ug-icon-button{width:40px;height:40px;flex:0 0 40px;border:1px solid var(--ug-line);border-radius:6px;display:inline-flex;align-items:center;justify-content:center;background:white}.ug-search .ug-icon-button{width:24px;height:28px;flex-basis:24px;border:0;padding:0}.ug-search .ug-icon-button .ug-icon{width:16px;height:16px;flex-basis:16px}.ug-search-status{font-size:12px;margin:5px 0;color:var(--ug-muted)}.ug-search-status:empty{display:none}.ug-toc nav a{display:flex;gap:12px;align-items:start;border-left:3px solid transparent;padding:8px 8px;font-size:13px;line-height:1.55;color:#526078;overflow-wrap:anywhere}.ug-toc nav a>span:first-child{flex:0 0 21px;font-variant-numeric:tabular-nums}.ug-toc nav a[aria-current]{color:#c94600;background:#fff2e7;border-left-color:#ff5a00;border-radius:0 4px 4px 0;font-weight:650}.ug-toc nav a:hover{background:#eef3f8;text-decoration:none}.ug-sidebar-return{display:flex;align-items:center;gap:6px;color:var(--ug-muted);font-size:13px;margin-top:30px}.ug-toc-toggle{display:none}.ug-content{padding:32px 48px 48px;min-width:0;max-width:1150px}.ug-kicker{font-size:12px;color:var(--ug-muted);margin-bottom:7px}.ug-chapter h2{font-size:28px;margin:0 0 12px}.ug-lead{color:#4b5e73}.ug-chapter h3{font-size:17px;margin:0 0 6px}.ug-chapter p{margin-bottom:16px;overflow-wrap:anywhere}.ug-steps{padding-left:25px;margin:22px 0}.ug-steps>li{padding-left:5px;margin:0 0 18px}.ug-steps>li::marker{font-weight:700}.ug-callout{border-left:3px solid #21858d;background:#f0f8f7;padding:12px 16px;margin:20px 0;font-size:14px}.ug-callout.warning{border-color:#d2a000;background:#fff9e9}.ug-callout p{margin:4px 0 0}.ug-figure{margin:28px 0;max-width:100%}.ug-figure>h3{margin-bottom:12px}.ug-screenshot{display:block;position:relative;width:100%;padding:0;background:#f6f8fb;border:1px solid var(--ug-line);border-radius:4px;cursor:zoom-in;text-align:left}.ug-image-stage{display:block;position:relative;width:100%}.ug-image-stage>img{display:block;width:100%;height:auto;object-fit:contain}.ug-marker{position:absolute;display:grid;place-items:center;width:24px;height:24px;border:2px solid white;border-radius:50%;background:#d94b20;color:white;font-size:12px;font-weight:700;line-height:1;transform:translate(-50%,-50%);box-shadow:0 1px 3px #0003;pointer-events:none}.ug-expand{position:absolute;right:9px;top:9px;display:grid;place-items:center;width:34px;height:34px;border:1px solid #cbd6e3;background:#fffffff0;border-radius:4px;color:#47617e}.ug-figure figcaption{font-size:12px;color:var(--ug-muted);margin-top:8px}.ug-image-notes{padding:0;list-style:none;margin:15px 0;font-size:14px}.ug-image-notes li{display:flex;gap:9px;margin:8px 0}.ug-image-notes li>span{flex:0 0 21px;display:grid;place-items:center;align-self:flex-start;min-height:21px;background:#fff0e7;color:#b64314;border-radius:50%;font-size:12px;font-weight:700}.ug-image-notes li p{margin:0}.ug-table-wrap{overflow:auto;border:1px solid var(--ug-line);margin:20px 0;max-width:100%}.ug-table-wrap table{border-collapse:collapse;min-width:100%;font-size:14px}.ug-table-wrap th,.ug-table-wrap td{text-align:left;vertical-align:top;padding:12px;border-bottom:1px solid var(--ug-line);min-width:100px}.ug-table-wrap th{background:#f3f6fa;font-weight:650}.ug-table-wrap tr:last-child td{border-bottom:0}.ug-chapter-pagination{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--ug-line);padding:20px 0;margin-top:24px}.ug-chapter-pagination a{display:flex;align-items:center;gap:5px;max-width:48%;font-size:13px}.ug-chapter-pagination a:last-child{margin-left:auto;text-align:right}.ug-edition{font-size:12px;color:var(--ug-muted);border-top:1px solid var(--ug-line);padding:16px 0}.ug-edition summary{cursor:pointer}.ug-edition p{margin:10px 0}
.ug-lightbox{border:1px solid var(--ug-line);border-radius:6px;width:min(96vw,1700px);height:92vh;max-width:96vw;max-height:94vh;padding:0;background:#f3f6fa;color:var(--ug-ink)}.ug-lightbox::backdrop{background:#061a2bce}.ug-lightbox[open]{display:flex;flex-direction:column}.ug-lightbox-bar{display:flex;align-items:center;gap:10px;background:white;border-bottom:1px solid var(--ug-line);padding:12px 16px}.ug-lightbox-bar h2{flex:1;font-size:17px;margin:0;min-width:0}.ug-lightbox-scroll{flex:1;overflow:auto;padding:18px;min-height:0}.ug-lightbox-stage{margin:auto}.ug-lightbox-stage .ug-image-stage{max-width:none}.ug-lightbox-stage .ug-expand{display:none}.ug-lightbox-stage img{max-width:none}.ug-unavailable{max-width:800px;margin:60px auto;padding:24px}
.ug-screenshot{max-width:800px;margin-inline:auto}
@media(max-width:1100px){.ug-header-inner{gap:25px}.ug-site-nav{gap:20px;margin-left:0}.ug-content{padding:30px}.ug-reader{grid-template-columns:245px minmax(0,1fr)}.ug-sidebar{padding:22px 14px}}
@media(max-width:768px){.ug-header-inner{padding:12px 20px;min-height:60px;position:relative}.ug-brand{font-size:19px}.ug-brand-mark{width:34px;height:34px;font-size:24px}.ug-return{display:none}.ug-mobile-nav{display:inline-flex!important;margin-left:auto;color:#fff;border:0;background:transparent}.ug-site-nav{display:none;position:absolute;left:0;right:0;top:100%;z-index:30;background:var(--ug-header);padding:12px 20px 18px;margin:0;border-top:1px solid #ffffff24}.ug-site-nav.open{display:grid;grid-template-columns:1fr 1fr;gap:8px}.ug-site-nav a{padding:10px}.ug-masthead-inner{display:block;padding:22px 20px}.ug-masthead h1{font-size:25px}.ug-meta{font-size:12px;line-height:1.7}.ug-toolbar{margin-top:18px}.ug-toolbar-row{justify-content:space-between;gap:10px}.ug-language{flex:1;min-width:0}.ug-download{padding:8px 12px;font-size:13px}.ug-pdf-meta{margin-top:10px}.ug-reader{display:block}.ug-sidebar{padding:18px 20px 0;background:#fff;border:0}.ug-toc-toggle{display:flex;width:100%;align-items:center;gap:10px;text-align:left;background:#f8fafc;border:1px solid var(--ug-line);border-radius:5px;min-height:44px;padding:10px 12px;font-size:14px}.ug-toc-toggle .ug-chevron{margin-left:auto}.ug-toc-toggle[aria-expanded=true] .ug-chevron{transform:rotate(180deg)}.ug-toc{position:static;max-height:none;padding:14px 0 0}.ug-toc nav a{font-size:14px;padding:10px}.ug-toc>h2,.ug-sidebar-return{display:none}.ug-content{padding:28px 20px}.ug-chapter h2{font-size:24px}.ug-chapter h3{font-size:17px}.ug-page .ug-chapter{font-size:15px}.ug-callout{padding:12px}.ug-marker{width:18px;height:18px;font-size:10px;border-width:1px}.ug-expand{width:30px;height:30px;right:5px;top:5px}.ug-lightbox-bar{padding:10px;flex-wrap:wrap}.ug-lightbox-bar h2{flex-basis:100%;font-size:15px}.ug-lightbox-scroll{padding:8px}}
@media(max-width:360px){.ug-masthead-inner,.ug-sidebar,.ug-header-inner{padding-left:14px;padding-right:14px}.ug-content{padding-left:14px;padding-right:14px}.ug-toolbar-row{flex-wrap:wrap}.ug-language{min-width:110px}.ug-download{white-space:normal;flex:1;min-width:160px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(max-width:768px){.ug-language nav{left:0;right:auto}.ug-toc-toggle .ug-i-chevron{margin-left:auto}.ug-toc-toggle[aria-expanded=true] .ug-i-chevron{transform:rotate(180deg)}}
@media print{.ug-header,.ug-toolbar,.ug-sidebar,.ug-chapter-pagination,.ug-lightbox,.ug-edition{display:none!important}.ug-reader{display:block}.ug-content{padding:0;max-width:none}.ug-chapter[hidden]{display:block!important}.ug-chapter{break-before:page}.ug-masthead-inner{padding:10px 0}.ug-figure,.ug-callout,tr{break-inside:avoid}.ug-expand{display:none}}