:root{color-scheme:light;--paper:#fff;--canvas:#fff;--side:#f7f7f7;--quiet:#f0f0f0;--ink:#191919;--soft:#525252;--muted:#686868;--line:#e3e3e3;--blue:#171717;--blue-bg:#ececec;--focus:#171717;--code:#181818;--code-ink:#f2f2f2;--radius:9px;--top:72px;font-family:"Segoe UI","Microsoft YaHei UI","Microsoft YaHei","PingFang SC",Arial,sans-serif;font-synthesis:none}
:root.dark{color-scheme:dark;--paper:#111111;--canvas:#111111;--side:#0e0e0e;--quiet:#1c1c1c;--ink:#f4f4f4;--soft:#c0c0c0;--muted:#a0a0a0;--line:#303030;--blue:#fafafa;--blue-bg:#262626;--focus:#fafafa;--code:#0a0a0a;--code-ink:#eeeeee}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;background:var(--canvas);color:var(--ink);font-size:15px;line-height:1.75}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button{cursor:pointer}a{color:var(--blue);text-decoration:none;text-underline-offset:4px}a:hover{text-decoration:underline}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--focus);outline-offset:4px}button:disabled{cursor:not-allowed;opacity:.5}svg{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}button svg{width:19px;height:19px;flex:none}img{max-width:100%}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:20px;top:-90px;background:var(--paper);padding:12px 20px;z-index:90;border:2px solid var(--focus)}.skip-link:focus{top:10px}.topbar{height:var(--top);position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:25px;padding:0 30px;border-bottom:1px solid var(--line);background:var(--paper)}.brand{display:flex;align-items:center;gap:10px;flex:none;color:var(--ink);font-size:18px;font-weight:650;letter-spacing:.01em}.brand:hover{text-decoration:none}.brand img{object-fit:contain}.brand-divider{width:1px;height:17px;background:var(--line);margin:0 3px}.brand-description{font-size:12px;font-weight:450;letter-spacing:.02em;color:var(--muted)}.search-trigger{margin-left:auto;width:clamp(230px,27vw,390px);display:flex;align-items:center;gap:10px;background:var(--side);border:1px solid var(--line);padding:9px 12px;border-radius:6px;color:var(--muted);text-align:left;font-size:12px;transition:border-color .15s ease-out}.search-trigger:hover{border-color:var(--muted)}.search-trigger kbd{margin-left:auto;font:11px "Segoe UI",sans-serif;border:1px solid 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var(--line);line-height:1.6}.on-this-page nav a.active{color:var(--blue);border-color:var(--blue);font-weight:550}.toc-tools{display:flex;flex-direction:column;align-items:start;gap:11px;margin-top:27px;padding-top:20px;border-top:1px solid var(--line)}.toc-tools button{border:0;background:none;padding:0;color:var(--muted);font-size:11px}.toc-tools button:hover{color:var(--blue)}.toc-tools a{font-size:11px;color:var(--muted)}.flow-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.flow-heading h2{margin-right:auto}.flow-heading a{font-size:11px;white-space:nowrap}.flow-scroll{overflow:auto;padding-bottom:10px;scrollbar-width:thin}.flow{display:flex;align-items:stretch;gap:10px;min-width:590px;margin:4px 0 5px}.flow-node{flex:1;min-width:108px;padding:15px 12px;border:1px solid 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0;font-size:13px;color:var(--soft);line-height:1.9}.demo-accounts{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:23px 0}.demo-account{border:1px solid var(--line);border-radius:7px;padding:19px}.demo-account h3{margin:0 0 18px;font-size:16px}.demo-account dl{display:grid;grid-template-columns:45px 1fr;gap:9px 12px;font-size:12px;margin:0 0 19px}.demo-account dt{color:var(--muted)}.demo-account dd{margin:0;font-family:Consolas,monospace;font-size:13px;display:flex;justify-content:space-between;gap:8px;align-items:center}.copy-small{border:0;background:var(--quiet);border-radius:3px;font-size:10px;padding:2px 7px;color:var(--soft);font-family:inherit}.demo-link{display:block;padding:8px 13px;border-radius:5px;background:var(--blue);color:var(--paper);font-size:12px;text-align:center;font-weight:550}.dark .demo-link{color:#101010}.demo-link:hover{filter:brightness(1.08);text-decoration:none}.demo-account 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.top-navigation{display:flex;align-items:center;gap:25px;height:100%;flex:none}.top-link:hover{text-decoration:none;color:var(--ink)}.top-link[aria-current=true]{color:var(--ink);border-bottom-color:var(--blue);font-weight:650}.audience-switch button:hover{background:var(--paper);color:var(--ink)}.video-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 15px;margin:0 0 14px;padding:0;list-style:none}.video-chapters button{display:flex;align-items:baseline;gap:8px;min-height:39px;text-align:left;line-height:1.5;width:100%;padding:8px 10px;border:1px solid transparent;border-radius:4px;background:var(--side);color:var(--soft);font-size:11px}.video-chapters button span{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}.video-chapters button:hover{color:var(--blue);border-color:var(--line)}.video-chapters button[aria-current=true]{background:var(--blue-bg);color:var(--blue)}.video-frame video::cue{background:#111111;color:#fff;font-family:"Microsoft YaHei",sans-serif}
.directory-toolbar{position:sticky;top:-28px;z-index:2;background:var(--side);padding:12px 0 1px;margin-top:-12px}.catalog-group a{scroll-margin-top:180px}.audience-switch button{border-radius:4px}
.theme-toggle{width:64px;gap:6px;padding:0 8px;border:1px solid var(--line);font-size:12px;font-weight:600}.theme-symbol{display:block;flex:none;width:12px;height:12px;border:1px solid var(--ink);border-radius:50%;background:linear-gradient(90deg,#111 50%,#fff 50%)}
@media(max-width:1180px){.topbar{gap:20px;padding-inline:24px}.top-navigation{gap:18px}.search-trigger{width:250px}.brand-description,.brand-divider{display:none}}
@media(max-width:820px){.top-navigation{display:none}.video-caption{display:block}.video-time{display:block;margin-top:5px}.video-chapters{gap:4px 7px}.video-chapters button{padding:8px 6px}}
@media(min-width:1450px){.layout{grid-template-columns:285px minmax(0,1fr) 220px}main{padding-inline:65px}.topbar{padding-inline:38px}}
@media(max-width:1150px){.layout{grid-template-columns:248px minmax(0,1fr)}main{padding-inline:35px}.on-this-page{display:none}.search-trigger{width:290px}.topbar{gap:20px}.brand-description{display:none}.brand-divider{display:none}}
@media(max-width:820px){:root{--top:60px}.topbar{padding:0 16px;gap:12px}.menu-toggle{display:inline-flex}.brand{font-size:15px;gap:7px}.brand img{width:28px}.top-link{display:none}.search-trigger{margin-left:auto;width:36px;justify-content:center;border:0;background:transparent;padding:7px}.search-trigger span,.search-trigger kbd{display:none}.layout{display:block}.sidebar{position:fixed;top:var(--top);bottom:0;left:0;width:286px;height:calc(100dvh - var(--top));z-index:35;transform:translateX(-100%);transition:transform .2s ease-out;box-shadow:12px 0 35px #00000016}.sidebar.open{transform:none}main{padding:27px 23px 0;max-width:760px}.breadcrumbs{margin-bottom:21px;font-size:11px}h1{font-size:29px;line-height:1.45;margin-bottom:18px}h2{font-size:20px;margin-top:35px}.article-summary{font-size:15px;line-height:1.95}.step p{font-size:14px}.article-footer{font-size:9px;gap:8px}.flow{min-width:660px}.video-library{gap:24px 15px}.screen figcaption span:last-child{display:none}.demo-accounts{gap:14px}.code-toolbar{gap:8px}.code-toolbar span{max-width:75%;line-height:1.5}.table-wrap td,.table-wrap th{padding:10px 12px}td:first-child{min-width:100px}.page-turn{gap:20px;font-size:12px}.search-dialog{margin-top:7dvh}}
@media(max-width:460px){main{padding-inline:19px}.brand{font-size:14px}.brand img{width:26px}.topbar{gap:8px;padding-inline:12px}.demo-accounts{grid-template-columns:1fr}.video-library{grid-template-columns:1fr 1fr;gap:24px 12px}.video-card h3{font-size:12px}.video-card .poster::after{width:30px;height:30px;font-size:12px}.route-bar{font-size:11px;padding:11px 12px}.article-meta{font-size:11px}.screen{margin-inline:-3px}.screen figcaption{font-size:10px}.step{grid-template-columns:26px minmax(0,1fr);gap:10px}.step h3{font-size:15px}.doc-note{display:block}.doc-note strong{display:block;margin-bottom:6px}.image-dialog{width:calc(100% - 14px)}.image-stage{padding:4px}.image-stage img{min-width:950px}.image-toolbar span{font-size:11px}.search-footer{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{.topbar,.sidebar,.on-this-page,.page-turn,.article-footer,.breadcrumbs,.video-frame,dialog,.toast,.skip-link,.screen-button{display:none!important}.layout{display:block}main{padding:0;max-width:100%}body{font-size:11pt;color:#111;background:white}.article-summary,.prose,.step p,td{color:#222}h1{font-size:25pt}h2{break-after:avoid}table,.step{break-inside:avoid}.screen figcaption{display:block}.flow{min-width:0;gap:5px}.flow-node{padding:7px;min-width:0;font-size:9px}.flow-node small{font-size:8px}.demo-link{background:none;color:#111}.transcript{display:block}.transcript>p{display:block}.code-block{background:#f5f5f5;color:#111}pre{white-space:pre-wrap;word-break:break-all}.code-toolbar{color:#111}.code-toolbar button{display:none}}

.flow-branches{display:grid;grid-template-columns:repeat(2,minmax(180px,1fr));gap:16px;min-width:400px}.flow-branches .flow-node::after{display:none}.flow-fork-label{color:var(--muted);font-size:13px;text-align:center;padding:6px 0}
.video-guide-note { margin: 0 0 14px; color: var(--soft); font-size: 13px; line-height: 1.8; }