.article{padding:2rem 1.5rem 4rem}.article-container{max-width:900px;margin:0 auto}.article-header{margin-bottom:2.5rem;padding-bottom:2rem;border-bottom:1px solid var(--border-color)}.article-header-container{display:flex;gap:2rem;align-items:flex-start}.article-logo{flex-shrink:0}.article-logo img{display:block;border-radius:.5rem;width:150px;height:150px;object-fit:contain}.article-info{flex:1;min-width:0}.article-info .article-meta{margin-bottom:.5rem}.article-info .article-title{margin-bottom:.75rem}.article-info .article-description{margin-bottom:1rem}.article-header .article-meta{margin-bottom:1rem}.article-level{display:inline-flex;align-items:center;gap:.5rem;font-size:.875rem;font-weight:500;margin-left:1rem}.article-level .level-icon{display:inline-flex;gap:2px;align-items:flex-end}.article-level .level-bar{width:4px;background:var(--border-color);border-radius:1px}.article-level .level-bar:nth-child(1){height:8px}.article-level .level-bar:nth-child(2){height:12px}.article-level .level-bar:nth-child(3){height:16px}.article-level.level-beginner .level-bar:nth-child(1){background:#22c55e}.article-level.level-beginner .level-text{color:#22c55e}.article-level.level-intermediate .level-bar:nth-child(1),.article-level.level-intermediate .level-bar:nth-child(2){background:#f59e0b}.article-level.level-intermediate .level-text{color:#f59e0b}.article-level.level-advanced .level-bar:nth-child(1),.article-level.level-advanced .level-bar:nth-child(2),.article-level.level-advanced .level-bar:nth-child(3){background:#ef4444}.article-level.level-advanced .level-text{color:#ef4444}.article-header .article-title{font-size:3rem;font-weight:700;color:var(--text-primary);line-height:1.15;letter-spacing:-.02em;margin-bottom:1rem}.article-header .article-description{font-size:1.125rem;color:var(--text-secondary);line-height:1.7;margin-bottom:1.5rem}.toc{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:.75rem;padding:1.5rem;margin-bottom:2.5rem}.toc-title{display:flex;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-color)}.toc-title-icon{width:1.25rem;height:1.25rem;color:var(--accent-color);flex-shrink:0}.toc-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-color);cursor:pointer;user-select:none}.toc-header .toc-title{margin-bottom:0;padding-bottom:0;border-bottom:none}.toc-toggle{display:flex;align-items:center;justify-content:center;width:1.5rem;height:1.5rem;padding:0;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:.375rem;cursor:pointer;transition:background-color .2s ease,border-color .2s ease;flex-shrink:0}.toc-toggle:hover{background-color:var(--accent-color);border-color:var(--accent-color)}.toc-toggle:hover .toc-toggle-icon::before,.toc-toggle:hover .toc-toggle-icon::after{background-color:#fff}.toc-header:hover .toc-toggle{background-color:var(--accent-color);border-color:var(--accent-color)}.toc-header:hover .toc-toggle-icon::before,.toc-header:hover .toc-toggle-icon::after{background-color:#fff}.toc-toggle:focus{outline:2px solid var(--accent-color);outline-offset:2px}.toc-toggle:focus:not(:focus-visible){outline:none}.toc-toggle-icon{position:relative;width:.625rem;height:.625rem}.toc-toggle-icon::before,.toc-toggle-icon::after{content:'';position:absolute;background-color:var(--text-secondary);transition:transform .3s ease,opacity .3s ease,background-color .2s ease}.toc-toggle-icon::before{width:100%;height:2px;top:50%;left:0;transform:translateY(-50%)}.toc-toggle-icon::after{width:2px;height:100%;left:50%;top:0;transform:translateX(-50%)}[data-collapsible]:not(.collapsed) .toc-toggle-icon::after{opacity:0}.toc-nav{overflow:hidden;transition:max-height .3s ease-out,opacity .3s ease-out;max-height:1e3px;opacity:1}.toc.collapsed .toc-nav{max-height:0;opacity:0}.toc.collapsed .toc-header{margin-bottom:0;padding-bottom:0;border-bottom:none}.toc-nav ul{list-style:none}.toc-nav li{margin-bottom:.5rem}.toc-nav a{display:block;color:var(--text-secondary);font-size:.9375rem;transition:color .2s ease;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toc-nav a:hover{color:var(--accent-color)}.toc-nav ul ul{margin-left:.5rem;margin-top:.5rem}.toc-nav ul ul a{font-size:.875rem;color:var(--text-muted)}.toc-nav ul ul a:hover{color:var(--accent-color)}.toc-nav a.active{color:var(--accent-color);font-weight:600}.toc-branch-toggle{display:inline-block;width:1rem;margin-right:.25rem;text-align:center;color:var(--text-muted);font-size:.8rem;line-height:1;cursor:pointer;user-select:none;transition:color .2s ease}.toc-branch-toggle:hover{color:var(--accent-color)}.toc-branch-toggle::before{content:"\2212"}.toc-parent.collapsed>.toc-branch-toggle::before{content:"+"}.toc-grid{display:grid;grid-template-rows:1fr;transition:grid-template-rows .3s ease}.toc-grid>ul{overflow:hidden;min-height:0;opacity:1;transition:opacity .25s ease}.toc-parent.collapsed>.toc-grid{grid-template-rows:0fr}.toc-parent.collapsed>.toc-grid>ul{opacity:0}.toc-nav li:not(.toc-parent)>a{padding-left:1.25rem}.toc-nav .toc-parent{display:flex;flex-wrap:wrap;align-items:baseline}.toc-nav .toc-parent>.toc-branch-toggle{flex:none}.toc-nav .toc-parent>a{flex:1;min-width:0}.toc-nav .toc-parent>.toc-grid{flex-basis:100%}.sidebar-related{display:none;background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:.75rem;padding:1.5rem}.sidebar-related-list{list-style:none;display:flex;flex-direction:column;gap:1.5rem;overflow:hidden;transition:max-height .3s ease-out,opacity .3s ease-out;max-height:1e3px;opacity:1}.sidebar-related.collapsed .sidebar-related-list{max-height:0;opacity:0}.sidebar-related.collapsed .toc-header{margin-bottom:0;padding-bottom:0;border-bottom:none}.sidebar-related-list li+li{border-top:1px solid var(--border-color);padding-top:1.5rem}.sidebar-related-link{display:block}.sidebar-related-head{display:flex;align-items:center;gap:.875rem;margin-bottom:.625rem}.sidebar-related-logo{width:2.75rem;height:2.75rem;object-fit:contain;flex-shrink:0}.sidebar-related-name{font-size:1.1875rem;font-weight:600;color:var(--text-primary);line-height:1.3;transition:color .2s ease}.sidebar-related-link:hover .sidebar-related-name{color:var(--accent-color)}.sidebar-related-desc{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;line-clamp:3;overflow:hidden;font-size:1rem;color:var(--text-secondary);line-height:1.55}.article-content h1,.article-content h2,.article-content h3,.article-content h4,.article-content h5{scroll-margin-top:5rem}@media(min-width:1025px){.article-container.has-toc{max-width:1280px}.article-body.has-toc{display:grid;grid-template-columns:300px minmax(0,1fr);gap:3rem;align-items:start}.article-container.has-toc .article-header-container{display:grid;grid-template-columns:300px minmax(0,1fr);gap:3rem;align-items:start}.article-container.has-toc .article-logo{width:100%;display:flex;justify-content:center}.article-container.has-toc .article-logo img{width:240px;height:240px}.article-body.has-toc .toc-column{position:sticky;top:5rem;align-self:start}.article-body.has-toc .toc{margin-bottom:1.5rem}.article-body.has-toc .toc:not(.collapsed) .toc-nav{max-height:none;overflow:visible}.article-body.has-toc .sidebar-related:not(.collapsed) .sidebar-related-list{max-height:none}.article-body.has-toc .sidebar-related{display:block}.article-container.has-toc .related-articles{display:none}}.article-content{font-size:1.125rem;line-height:1.85}.article-content>:first-child{margin-top:0}.article-content p{margin-bottom:.75rem;text-align:justify}.article-content h1{font-size:2.25rem;font-weight:700;color:var(--text-primary);line-height:1.2;margin-top:3rem;margin-bottom:1.25rem}.article-content h2{font-size:2.25rem;font-weight:700;color:var(--text-primary);line-height:1.2;margin-top:3rem;margin-bottom:1.25rem}.article-content hr{border:none;border-top:2px solid var(--accent-color);margin:2.5rem 0}.article-content h3{font-size:1.5rem;font-weight:600;color:var(--text-primary);line-height:1.35;margin-top:2rem;margin-bottom:1rem}.article-content h4{font-size:1.25rem;font-weight:600;color:var(--text-primary);line-height:1.4;margin-top:1.5rem;margin-bottom:.75rem}.article-content h5{font-size:1.0625rem;font-weight:700;color:var(--text-secondary);line-height:1.4;text-transform:uppercase;letter-spacing:.04em;margin-top:1.5rem;margin-bottom:.5rem}.article-content strong{font-weight:600;color:var(--text-primary)}.article-content a{color:var(--accent-color);text-decoration:underline;text-underline-offset:2px}.article-content a:hover{color:var(--accent-hover)}.article-content img{max-height:500px;width:auto;height:auto;display:block;margin:1.5rem auto;border-radius:.5rem}.article-content blockquote{margin:2rem 0;padding:1.5rem 2rem;background:linear-gradient(135deg,var(--bg-card) 0%,var(--bg-secondary) 100%);border-left:4px solid var(--accent-color);border-radius:0 .75rem .75rem 0;font-size:1.25rem;font-style:italic;color:var(--text-primary);text-align:center;box-shadow:var(--card-shadow)}.article-content blockquote p{margin-bottom:0;text-align:center}.article-content blockquote strong{color:var(--accent-color);font-weight:700}.article-content ul,.article-content ol{margin-bottom:1.5rem;padding-left:1.75rem}.article-content p+ul,.article-content p+ol{margin-top:-.25rem}.article-content li{margin-bottom:.25rem;color:var(--text-secondary);text-align:justify}.article-content li strong{color:var(--text-primary)}.article-content table{width:100%;margin:1.5rem 0;border-collapse:collapse;background-color:var(--bg-card);border-radius:.5rem;overflow:hidden;box-shadow:var(--card-shadow);border:1px solid var(--border-color)}.article-content thead{background-color:var(--accent-color)}.article-content thead th{padding:.875rem 1.25rem;font-weight:600;font-size:.9375rem;color:#fff;text-align:left;border-bottom:2px solid var(--accent-hover)}.article-content tbody tr{border-bottom:1px solid var(--border-color);transition:background-color .2s ease}.article-content tbody tr:last-child{border-bottom:none}.article-content tbody tr:nth-child(even){background-color:var(--bg-secondary)}.article-content tbody tr:hover{background-color:var(--bg-secondary)}.article-content tbody td{padding:.75rem 1.25rem;font-size:.9375rem;color:var(--text-secondary);text-align:left}.article-content tbody td:first-child{font-weight:500;color:var(--text-primary)}.article-content th:not(:first-child),.article-content td:not(:first-child){text-align:center}@media(max-width:768px){.article-content table{font-size:.875rem;display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}.article-content thead th,.article-content tbody td{padding:.625rem 1rem;white-space:nowrap}}@media(max-width:480px){.article-content thead th,.article-content tbody td{padding:.5rem .75rem;font-size:.8125rem}}.article-content code{font-family:sf mono,fira code,monaco,consolas,monospace;font-size:.875em;padding:.2em .4em;background-color:var(--inline-code-bg);color:var(--inline-code-text);border-radius:.25rem}.code-block{margin-bottom:1.5rem;border-radius:.5rem;overflow:hidden;background-color:var(--code-bg);box-shadow:var(--card-shadow)}.code-header{display:flex;justify-content:space-between;align-items:center;padding:.5rem 1rem;background-color:var(--code-header-bg);border-bottom:1px solid rgba(255,255,255,.1)}.code-language{font-size:.75rem;font-weight:600;text-transform:uppercase;color:var(--accent-color);letter-spacing:.05em}.code-copy-btn{display:flex;align-items:center;justify-content:center;padding:.375rem;background:0 0;border:none;color:var(--text-muted);cursor:pointer;border-radius:.25rem;transition:color .2s ease,background-color .2s ease}.code-copy-btn:hover{color:var(--text-primary);background-color:rgba(255,255,255,.1)}.code-copy-btn.copied{color:var(--accent-color)}.code-content{margin:0;padding:.75rem 1.25rem 1.25rem;overflow-x:auto}.code-content code{font-family:sf mono,fira code,monaco,consolas,monospace;font-size:.875rem;line-height:1.35;color:var(--code-text);background:0 0;padding:0}.highlight{margin-bottom:1.5rem;border-radius:.5rem;overflow:hidden;background-color:var(--code-bg);box-shadow:var(--card-shadow)}.highlight pre{margin:0;padding:1rem 1.25rem;overflow-x:auto}.highlight code{font-family:sf mono,fira code,monaco,consolas,monospace;font-size:.875rem;line-height:1.35;color:var(--code-text);background:0 0;padding:0}.code-block .highlight{margin-bottom:0;border-radius:0;overflow:visible;background-color:initial;box-shadow:none}.code-block .highlight pre{padding:0;overflow-x:visible}.code-block .chroma{background-color:initial}.article-figure{margin:2rem 0;text-align:center}.article-image{max-width:100%;height:auto;border-radius:.5rem;box-shadow:var(--card-shadow);border:1px solid var(--border-color)}.article-caption{margin-top:.75rem;font-size:.875rem;color:var(--text-muted);font-style:italic}.content-divider{border:none;border-top:1px solid var(--border-color);margin:2.5rem 0}.admonition{display:flex;gap:1rem;padding:1.25rem;margin:1.5rem 0;border-radius:.5rem;border-left:4px solid}.admonition-note{background-color:var(--note-bg);border-left-color:var(--note-border)}.admonition-warning{background-color:var(--warning-bg);border-left-color:var(--warning-border)}.admonition-tip{background-color:var(--tip-bg);border-left-color:var(--tip-border)}.admonition-danger{background-color:var(--danger-bg);border-left-color:var(--danger-border)}.admonition-icon{flex-shrink:0;margin-top:.125rem}.admonition-note .admonition-icon{color:var(--note-icon)}.admonition-warning .admonition-icon{color:var(--warning-icon)}.admonition-tip .admonition-icon{color:var(--tip-icon)}.admonition-danger .admonition-icon{color:var(--danger-icon)}.admonition-content{flex:1;font-size:inherit;color:var(--text-secondary);line-height:1.6}.admonition-title{font-weight:600;font-size:1.1rem;margin-bottom:.5rem;color:var(--text-primary)}.admonition-content p{margin-bottom:.5rem}.admonition-content p:last-child{margin-bottom:0}.admonition-content ul{margin:0;padding-left:1.25rem}.admonition-content li{margin-bottom:.25rem;color:var(--text-secondary)}.admonition-content li:last-child{margin-bottom:0}.steps-container{counter-reset:step-counter;margin:2rem 0;padding:0}.step-item{display:flex;gap:1.25rem;counter-increment:step-counter;position:relative}.step-marker{display:flex;flex-direction:column;align-items:center;flex-shrink:0}.step-number{width:2.25rem;height:2.25rem;border-radius:50%;background-color:var(--accent-color);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;flex-shrink:0;z-index:1}.step-number::before{content:counter(step-counter)}.step-line{width:2px;flex-grow:1;background-color:var(--border-color);min-height:1.5rem}.step-item:last-child .step-line{display:none}.step-content{padding-bottom:2rem;min-width:0;flex:1}.step-item:last-child .step-content{padding-bottom:0}.step-content .step-title{margin:0 0 .75rem;font-size:1.5rem;font-weight:600;color:var(--text-primary);line-height:2.25rem}.step-description{color:var(--text-primary);font-size:1.05rem;line-height:1.75}.step-description p:first-child{margin-top:0}.step-description p:last-child{margin-bottom:0}.step-description pre{margin:1rem 0}.step-description ul,.step-description ol{margin:.5rem 0;padding-left:1.25rem}@media(max-width:768px){.steps-container{margin:1.5rem 0}.step-item{gap:1rem}.step-number{width:2rem;height:2rem;font-size:.8rem}.step-title{font-size:1.25rem;line-height:2rem}.step-content{padding-bottom:1.5rem}}@media(max-width:480px){.step-item{gap:.75rem}.step-number{width:1.75rem;height:1.75rem;font-size:.75rem}.step-title{font-size:1.125rem;line-height:1.75rem}}.step-item{counter-reset:substep-counter}.substeps-container{margin:1rem 0 .5rem;padding:0}.substep-item{display:flex;gap:1rem;counter-increment:substep-counter;position:relative}.substep-marker{display:flex;flex-direction:column;align-items:center;flex-shrink:0}.substep-number{width:1.5rem;height:1.5rem;border-radius:50%;background-color:var(--accent-color);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.7rem;flex-shrink:0;z-index:1}.substep-number::before{content:counter(substep-counter)}.substep-line{width:1px;flex-grow:1;background-color:var(--border-color);min-height:1rem}.substep-item:last-child .substep-line{display:none}.substep-content{padding-bottom:1.25rem;min-width:0;flex:1}.substep-item:last-child .substep-content{padding-bottom:0}.substep-content .substep-title{margin:0 0 .5rem;font-size:1.15rem;font-weight:600;color:var(--text-primary);line-height:1.5rem}.substep-description{color:var(--text-primary);font-size:1rem;line-height:1.7}.substep-description p:first-child{margin-top:0}.substep-description p:last-child{margin-bottom:0}.substep-description pre{margin:1rem 0}.substep-description ul,.substep-description ol{margin:.5rem 0;padding-left:1.25rem}@media(max-width:768px){.substeps-container{margin:.75rem 0 .25rem}.substep-item{gap:.75rem}.substep-number{width:1.35rem;height:1.35rem;font-size:.625rem}.substep-content .substep-title{font-size:1.05rem;line-height:1.35rem}.substep-content{padding-bottom:1rem}}@media(max-width:480px){.substep-item{gap:.5rem}.substep-number{width:1.25rem;height:1.25rem;font-size:.575rem}.substep-content .substep-title{font-size:1rem;line-height:1.25rem}}.article-navigation{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border-color)}.nav-prev,.nav-next{display:flex;flex-direction:column;padding:1.25rem;background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:.5rem;transition:border-color .2s ease,box-shadow .2s ease}.nav-prev:hover,.nav-next:hover{border-color:var(--accent-color);box-shadow:var(--card-shadow)}.nav-next{text-align:right}.nav-empty{background:0 0;border:none}.nav-empty:hover{border:none;box-shadow:none}.nav-label{font-size:.75rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.5rem}.nav-title{font-size:1rem;font-weight:600;color:var(--text-primary);transition:color .2s ease}.nav-prev:hover .nav-title,.nav-next:hover .nav-title{color:var(--accent-color)}@media(max-width:1024px){.article-header .article-title{font-size:2.5rem}.article-header .article-description{font-size:1rem}.article-content h2{font-size:1.875rem}.article-content h3{font-size:1.3rem}}@media(max-width:768px){.article{padding:1.5rem 1rem 3rem}.article-header{margin-bottom:2rem;padding-bottom:1.5rem}.article-header-container{gap:1.5rem}.article-logo img{width:120px;height:120px}.article-header .article-title{font-size:2.25rem}.article-header .article-description{font-size:.9375rem}.toc{padding:1.25rem}.article-content h2{font-size:1.625rem;margin-top:2.5rem}.article-content h3{font-size:1.25rem;margin-top:1.75rem}.code-content{padding:.625rem 1rem 1rem}.code-content code{font-size:.8125rem}.article-navigation{grid-template-columns:1fr;gap:1rem}.nav-next{text-align:left}}@media(max-width:480px){.article{padding:1rem .75rem 2rem}.article-header-container{flex-direction:column;gap:1rem;align-items:center;text-align:center}.article-logo img{width:100px;height:100px}.article-info{text-align:center}.article-info .article-meta{justify-content:center}.article-tags{justify-content:center}.article-header .article-title{font-size:1.75rem}.article-header .article-description{font-size:.875rem}.toc{padding:1rem}.toc-title{font-size:.9375rem}.toc-nav a{font-size:.875rem}.toc-nav ul ul a{font-size:.8125rem}.article-content{font-size:1rem}.article-content h2{font-size:1.5rem;margin-top:2rem}.article-content h3{font-size:1.15rem;margin-top:1.5rem}.article-content ul,.article-content ol{padding-left:1.25rem}.code-header{padding:.375rem .75rem}.code-content{padding:.5rem .75rem .75rem}.code-content code{font-size:.75rem}.admonition{padding:1rem;gap:.75rem}.admonition-title{font-size:1rem}.admonition-content{font-size:inherit}.nav-prev,.nav-next{padding:1rem}.nav-title{font-size:.9375rem}}.related-articles{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border-color)}.related-articles-title{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:1.5rem}.related-articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}@media(max-width:768px){.related-articles-grid{grid-template-columns:repeat(2,1fr);gap:1rem}.related-articles-title{font-size:1.25rem}}@media(max-width:480px){.related-articles-grid{grid-template-columns:1fr}}@media print{.toc,.article-navigation,.related-articles,.code-copy-btn{display:none}.article{padding:0}.code-block,.highlight{border:1px solid #ccc}}.yt-guide{margin:0 0 1rem;padding-bottom:2.5rem;border-bottom:2px solid var(--accent-color);scroll-margin-top:5rem}.yt-window{border-radius:.5rem;overflow:hidden;background-color:var(--code-bg);box-shadow:var(--card-shadow)}.yt-window-bar{display:flex;align-items:center;gap:.75rem;padding:.5rem 1rem;background-color:var(--code-header-bg);border-bottom:1px solid rgba(255,255,255,.1)}.yt-window-dots{display:inline-flex;gap:.4rem;flex-shrink:0}.yt-window-dots span{width:.72rem;height:.72rem;border-radius:50%;display:block}.yt-window-dots span:nth-child(1){background-color:#ff5f56}.yt-window-dots span:nth-child(2){background-color:#ffbd2e}.yt-window-dots span:nth-child(3){background-color:#27c93f}.yt-window-title{font-size:.8125rem;font-weight:600;color:var(--accent-color);letter-spacing:.02em}.yt-window-link{margin-left:auto;display:inline-flex;align-items:center;flex-shrink:0;line-height:0;border-radius:.3rem;transition:transform .2s ease}.yt-window-link:hover{transform:scale(1.08)}.yt-window-logo{display:block}.yt-logo-body{fill:var(--text-secondary);transition:fill .2s ease}.yt-logo-tri{fill:var(--code-header-bg)}.yt-window-link:hover .yt-logo-body,.yt-window-link:focus-visible .yt-logo-body{fill:red}.yt-window-link:focus-visible{outline:2px solid var(--accent-color);outline-offset:2px}.yt-window-body{padding:.5rem 1rem 1rem}.yt-facade{position:relative;display:block;width:100%;aspect-ratio:16/9;border-radius:.375rem;overflow:hidden;cursor:pointer;background-color:#000}.yt-facade-thumb{width:100%;height:100%;object-fit:cover;display:block;transition:opacity .2s ease}.yt-facade:hover .yt-facade-thumb,.yt-facade:focus-visible .yt-facade-thumb{opacity:.9}.yt-facade:focus-visible{outline:3px solid var(--accent-color);outline-offset:3px}.yt-facade-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;filter:drop-shadow(0 2px 6px rgba(0,0,0,.4));transition:transform .2s ease}.yt-facade:hover .yt-facade-play{transform:translate(-50%,-50%)scale(1.08)}.yt-facade-play-bg{fill:var(--accent-color);transition:fill .2s ease}.yt-facade:hover .yt-facade-play-bg,.yt-facade:focus-visible .yt-facade-play-bg{fill:var(--accent-hover)}.yt-facade.yt-loaded{cursor:default;transform:none}.yt-facade.yt-loaded .yt-facade-thumb,.yt-facade.yt-loaded .yt-facade-play{display:none}.yt-facade-iframe{position:absolute;inset:0;width:100%;height:100%;border:0}@media print{.yt-guide{display:none}}.toc-nav .toc-video{margin-bottom:.75rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-color)}.toc-nav li.toc-video>a{display:flex;align-items:center;gap:0;padding-left:0;color:var(--accent-color);font-weight:600}.toc-video-icon{flex:0 0 1rem;width:1rem;margin-right:.25rem}.toc-video-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chroma{background-color:#0d0d0d;color:#cdd6f4;line-height:1.35}.chroma .ln{color:#6c7086;margin-right:.5em;padding:0 .5em}.chroma .lnt{color:#6c7086;margin-right:.5em;padding:0 .5em}.chroma .err{color:#f38ba8}.chroma .cl{color:#cdd6f4}.chroma .lntd{vertical-align:top;padding:0;margin:0;border:0}.chroma .lntable{border-spacing:0;padding:0;margin:0;border:0}.chroma .hl{background-color:#313244;display:block;width:100%}.chroma .k{color:#cba6f7}.chroma .kc{color:#fab387}.chroma .kd{color:#cba6f7}.chroma .kn{color:#94e2d5}.chroma .kp{color:#cba6f7}.chroma .kr{color:#cba6f7}.chroma .kt{color:#f9e2af}.chroma .n{color:#cdd6f4}.chroma .na{color:#89b4fa}.chroma .nb{color:#f5e0dc}.chroma .bp{color:#f5e0dc}.chroma .nc{color:#f9e2af}.chroma .no{color:#fab387}.chroma .nd{color:#89b4fa}.chroma .ni{color:#f9e2af}.chroma .ne{color:#f38ba8}.chroma .nf{color:#89b4fa}.chroma .fm{color:#89b4fa}.chroma .nl{color:#74c7ec}.chroma .nn{color:#f9e2af}.chroma .nx{color:#cdd6f4}.chroma .py{color:#cdd6f4}.chroma .nt{color:#cba6f7}.chroma .nv{color:#cdd6f4}.chroma .vc{color:#cdd6f4}.chroma .vg{color:#cdd6f4}.chroma .vi{color:#cdd6f4}.chroma .vm{color:#cdd6f4}.chroma .l{color:#fab387}.chroma .ld{color:#a6e3a1}.chroma .s{color:#a6e3a1}.chroma .sa{color:#a6e3a1}.chroma .sb{color:#a6e3a1}.chroma .sc{color:#a6e3a1}.chroma .dl{color:#a6e3a1}.chroma .sd{color:#6c7086;font-style:italic}.chroma .s2{color:#a6e3a1}.chroma .se{color:#f5c2e7}.chroma .sh{color:#a6e3a1}.chroma .si{color:#a6e3a1}.chroma .sx{color:#a6e3a1}.chroma .sr{color:#f5c2e7}.chroma .s1{color:#a6e3a1}.chroma .ss{color:#f38ba8}.chroma .m{color:#fab387}.chroma .mb{color:#fab387}.chroma .mf{color:#fab387}.chroma .mh{color:#fab387}.chroma .mi{color:#fab387}.chroma .il{color:#fab387}.chroma .mo{color:#fab387}.chroma .o{color:#89dceb}.chroma .ow{color:#89dceb;font-weight:700}.chroma .p{color:#9399b2}.chroma .c{color:#6c7086;font-style:italic}.chroma .ch{color:#6c7086;font-style:italic}.chroma .cm{color:#6c7086;font-style:italic}.chroma .c1{color:#6c7086;font-style:italic}.chroma .cs{color:#6c7086;font-style:italic}.chroma .cp{color:#f9e2af}.chroma .cpf{color:#a6e3a1}.chroma .g{color:#cdd6f4}.chroma .gd{color:#f38ba8;background-color:rgba(243,139,168,.1)}.chroma .ge{font-style:italic}.chroma .gr{color:#f38ba8}.chroma .gh{color:#89b4fa;font-weight:700}.chroma .gi{color:#a6e3a1;background-color:rgba(166,227,161,.1)}.chroma .go{color:#9399b2}.chroma .gp{color:#6c7086;font-weight:700}.chroma .gs{font-weight:700}.chroma .gu{color:#89b4fa}.chroma .gt{color:#f38ba8}.chroma .gl{text-decoration:underline}.chroma .w{color:#45475a}