.edu-library-section{width:100%;box-sizing:border-box;position:relative}.edu-library-section__layout{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,3fr);gap:20px;align-items:stretch}.edu-library-section__main{display:flex;flex-direction:column;width:100%;justify-content:flex-start}.edu-library-section__topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px}.edu-library-section__heading-row{display:inline-flex;align-items:center;flex:0 0 auto;margin-bottom:0}.edu-library-section__title{border-left:3px solid var(--edu-primary)!important;padding-left:12px!important;margin:0!important;color:var(--theme-palette-color-4)!important;text-align:justify!important;text-align-last:left!important}.edu-library-section__control-row{display:inline-flex;align-items:center;justify-content:flex-end;flex-wrap:nowrap;gap:10px;width:auto;margin-left:auto;margin-bottom:0;flex:0 0 auto}.edu-library-section__dropdown{position:relative;display:inline-flex;align-items:center;width:auto;flex:0 1 auto}.edu-library-section__dropdown-trigger{display:inline-flex;align-items:center;justify-content:flex-start;gap:6px;width:auto;white-space:nowrap;border:0;background:0 0;box-shadow:none;padding:6px 0;color:#ef1b24;font-size:18px;line-height:1.2;cursor:pointer}.edu-library-section__dropdown-label{color:#ef1b24;font-size:18px}.edu-library-section__dropdown-trigger:hover,.edu-library-section__dropdown-trigger:hover .edu-library-section__dropdown-label{color:var(--theme-palette-color-2)}.edu-library-section__dropdown-arrow{flex-shrink:0;transition:transform .2s ease;margin-top:2px;color:var(--theme-palette-color-4)}.edu-library-section__dropdown.is-open .edu-library-section__dropdown-arrow{transform:rotate(180deg)}.edu-library-section__dropdown-menu{position:absolute;top:100%;left:0;margin:4px 0 0 0;padding:6px 0;list-style:none;background-color:var(--edu-white);border:1px solid var(--edu-border);border-radius:var(--edu-radius);box-shadow:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);z-index:4;min-width:220px;max-height:250px;overflow-y:auto;box-sizing:border-box}.edu-library-section__dropdown-item{padding:8px 16px;font-size:16px;color:var(--theme-palette-color-4);cursor:pointer;white-space:nowrap}.edu-library-section__dropdown-item:hover{background-color:var(--edu-bg-soft);color:var(--theme-palette-color-2)}.edu-library-section__dropdown-item.is-active{background-color:var(--edu-bg-soft);color:var(--theme-palette-color-3);font-weight:600}.edu-library-section__playlist-btn,.edu-library-section__playlist-button{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;border:0;background:0 0;box-shadow:none;padding:0;margin:0;line-height:1;color:var(--theme-palette-color-2);cursor:pointer;outline:0;transition:color .2s ease}.edu-library-section__playlist-btn:hover,.edu-library-section__playlist-button:hover{color:var(--theme-palette-color-3)}.edu-library-section__playlist-svg{display:block;flex:0 0 auto;width:28px;height:28px;margin:0}.edu-library-section__video-wrap{position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--edu-radius);overflow:hidden;box-shadow:var(--edu-shadow);background-color:#000}.edu-library-section .edu-yt-lazy-player{position:absolute;top:0;left:0;width:100%;height:100%}.edu-library-section .edu-yt-lazy-player__play-btn{background-color:var(--theme-palette-color-3)!important;color:var(--edu-white)!important}.edu-library-section .edu-yt-lazy-player__placeholder:hover .edu-yt-lazy-player__play-btn{background-color:var(--theme-palette-color-2)!important;transform:translate(-50%,-50%) scale(1.1)!important}.edu-library-section__side{height:100%;display:flex;flex-direction:column}.edu-library-section__posts-container{flex-grow:1}.edu-library-section__post-list{display:flex;flex-direction:column;justify-content:space-between;height:100%;gap:10px}.edu-library-section__post-item{display:grid;grid-template-columns:clamp(118px,34%,150px) minmax(0,1fr);gap:10px;align-items:center;text-decoration:none;flex-shrink:0}.edu-library-section__post-thumb{position:relative;display:block;overflow:hidden;background-color:var(--edu-bg-soft);border-radius:var(--edu-radius);width:100%;aspect-ratio:16/9}.edu-library-section__post-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.edu-library-section__post-item:hover .edu-library-section__post-thumb img{transform:scale(1.05)}.edu-library-section__post-thumb--placeholder{background:linear-gradient(135deg,var(--edu-bg-soft),var(--edu-border))}.edu-library-section__post-thumb--placeholder::after{content:"";position:absolute;inset:0;background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23cbd5e1" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="18" height="18" rx="2" ry="2"/><circle cx="8.5" cy="8.5" r="1.5"/><polyline points="21 15 16 10 5 21"/></svg>');background-repeat:no-repeat;background-position:center;background-size:24px;opacity:.6}.edu-library-section__post-content{min-width:0}.edu-library-section__post-title{margin:0 0 6px 0!important;padding:0!important;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-align:justify;text-align-last:left}.edu-library-section__post-title a{color:var(--theme-palette-color-4);text-decoration:none;transition:color .2s ease}.edu-library-section__post-item:hover .edu-library-section__post-title a{color:var(--theme-palette-color-2)}.edu-library-section__post-item:active .edu-library-section__post-title a{color:var(--theme-palette-color-3)}.edu-library-section__post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--edu-muted);font-size:12px}.edu-library-section__meta-item{display:inline-flex;align-items:center;gap:4px}.edu-library-section__meta-icon{flex-shrink:0;stroke:currentColor}.edu-library-section__meta-text{white-space:nowrap}.edu-library-section__meta-sep{color:var(--edu-border);user-select:none}.edu-library-section__empty-message{padding:20px;text-align:center;color:var(--edu-muted);background-color:var(--edu-bg-soft);border-radius:var(--edu-radius);width:100%;box-sizing:border-box}.edu-library-section.is-loading{position:relative}.edu-library-section.is-loading::after{content:"";position:absolute;inset:0;background-color:rgba(255,255,255,.6);z-index:99;cursor:wait;border-radius:var(--edu-radius)}@media (max-width:1024px){.edu-library-section__layout{grid-template-columns:minmax(0,7fr) minmax(0,3fr);gap:16px}.edu-library-section__post-item{grid-template-columns:clamp(110px,34%,130px) minmax(0,1fr);gap:12px}}@media (max-width:767px){.edu-library-section__layout{grid-template-columns:1fr;gap:20px}.edu-library-section__side{height:auto}.edu-library-section__post-list{height:auto;gap:12px;display:flex;flex-direction:column;justify-content:flex-start}.edu-library-section__post-item{grid-template-columns:96px minmax(0,1fr);gap:12px}.edu-library-section__topbar{flex-wrap:wrap;gap:10px}}