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#0000004d}.nav-btn{color:var(--color-gray);cursor:pointer;background:0 0;border:none;flex-direction:column;align-items:center;gap:4px;padding:8px;transition:color .2s;display:flex}.nav-btn.active{color:var(--color-gold)}.nav-btn span{text-transform:uppercase;letter-spacing:.05em;font-size:10px;font-weight:600}.lesson-card{scroll-snap-align:center;scroll-snap-stop:always;background-color:#000;justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:relative}@keyframes practiceFadeIn{0%{opacity:0}to{opacity:1}}.video-bg{object-fit:cover;z-index:0;width:100%;height:100%;position:absolute;top:0;left:0}.stream-player{object-fit:cover;pointer-events:none;width:100%;height:100%}@media (width>=600px){.app-container{border-left:1px solid #ffffff1a;border-right:1px solid #ffffff1a;max-width:480px;margin:0 auto;box-shadow:0 0 50px #00000080}}.video-overlay{pointer-events:none;background:linear-gradient(#0006 0%,#0000 40%,#000c 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