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80px)}.corso-sidebar-header{padding:24px 20px;border-bottom:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;align-items:center;flex-shrink:0}.corso-sidebar-title{font-size:1.1rem;font-weight:600;color:var(--corso-sidebar-text);margin:0}.corso-lesson-count{font-size:.85rem;color:#fff9;background:#ffffff1a;padding:4px 12px;border-radius:20px}.corso-lesson-list{list-style:none;margin:0;padding:0;overflow-y:auto;flex:1}.corso-lesson-item{display:flex;align-items:center;gap:12px;padding:16px 20px;cursor:pointer;transition:all .2s ease;border-bottom:1px solid rgba(255,255,255,.05);position:relative}.corso-lesson-item:hover{background:#ffffff0d}.corso-lesson-item.is-active{background:#ccbc8026}.corso-lesson-item.is-active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--corso-primary)}.corso-lesson-item.is-completed{opacity:.7}.corso-lesson-number{font-size:.85rem;color:#fff6;min-width:20px;text-align:center}.corso-lesson-item.is-active .corso-lesson-number{color:var(--corso-primary);font-weight:600}.corso-lesson-thumb{width:60px;height:40px;border-radius:6px;overflow:hidden;flex-shrink:0;background:#ffffff1a}.corso-lesson-thumb img{width:100%;height:100%;object-fit:cover}.corso-lesson-thumb-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:#ffffff4d}.corso-lesson-item.is-active .corso-lesson-thumb-placeholder{color:var(--corso-primary)}.corso-lesson-name{flex:1;font-size:.95rem;color:var(--corso-sidebar-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.corso-lesson-check{width:24px;height:24px;border-radius:50%;border:2px solid rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .3s ease}.corso-lesson-check svg{opacity:0;transform:scale(0);transition:all .3s ease}.corso-lesson-check[data-completed=true]{background:var(--corso-primary);border-color:var(--corso-primary)}.corso-lesson-check[data-completed=true] svg{opacity:1;transform:scale(1);stroke:#1a1a2e}.corso-sidebar-footer{padding:20px;border-top:1px solid rgba(255,255,255,.1);flex-shrink:0}.corso-next-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;background:var(--corso-secondary);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease}.corso-next-btn:hover{background:var(--corso-primary);color:#1a1a2e;transform:translateY(-2px)}.corso-next-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}@media(max-width:1024px){.corso-container{grid-template-columns:1fr}}@media(max-width:768px){.corso-lesson-info{padding:20px}.corso-lesson-title{font-size:1.35rem}.corso-sidebar-header{padding:16px}.corso-lesson-item{padding:12px 16px}.corso-lesson-thumb{width:50px;height:34px}.corso-lesson-name{font-size:.9rem}}@media(max-width:480px){.corso-lesson-thumb{display:none}.corso-sidebar-header{flex-direction:column;gap:8px;align-items:flex-start}}.corso-lesson-list::-webkit-scrollbar{width:6px}.corso-lesson-list::-webkit-scrollbar-track{background:transparent}.corso-lesson-list::-webkit-scrollbar-thumb{background:#fff3;border-radius:3px}.corso-lesson-list::-webkit-scrollbar-thumb:hover{background:#ffffff4d}.corso-video.is-loading{background:#111 url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" stroke="%23CCBC80" stroke-width="4" fill="none" stroke-dasharray="164" stroke-dashoffset="50"><animateTransform attributeName="transform" type="rotate" from="0 50 50" to="360 50 50" dur="1s" repeatCount="indefinite"/></circle></svg>') center/60px no-repeat}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.corso-lesson-info{animation:fadeIn .4s ease}.corso-video-container{position:relative}.corso-video-container.is-loading:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:10;pointer-events:none}.corso-video-container.is-loading:before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:50px;height:50px;border:4px solid rgba(255,255,255,.2);border-top-color:var(--corso-primary, #CCBC80);border-radius:50%;animation:corso-spin .8s linear infinite;z-index:11}@keyframes corso-spin{to{transform:translate(-50%,-50%) rotate(360deg)}}.corso-video{transition:opacity .3s ease}.corso-video-container.is-loading .corso-video{opacity:.5}
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