.ott-course-player{
    display:flex;
    gap:32px;
    max-width:1400px;
    margin:40px auto;
    padding:20px;
    align-items:flex-start;
}

.ott-sidebar{
    width:320px;
    background:#ffffff;
    border:1px solid #e5e7eb;
    border-radius:18px;
    padding:24px;
    position:sticky;
    top:30px;
    box-shadow:0 8px 24px rgba(0,0,0,.06);
}

.ott-sidebar h1{
    font-size:28px;
    margin-bottom:10px;
}

.ott-section{
    margin-top:24px;
}

.ott-section h2{
    font-size:16px;
    margin-bottom:10px;
}

.ott-sidebar ul{
    list-style:none;
    margin:0;
    padding:0;
}

.ott-sidebar li{
    margin:8px 0;
}

.ott-sidebar a{
    display:block;
    padding:10px 14px;
    border-radius:10px;
    text-decoration:none;
    color:#222;
    transition:.2s;
}

.ott-sidebar a:hover{
    background:#f3f4f6;
}

.ott-content{
    flex:1;
    background:#fff;
    border:1px solid #e5e7eb;
    border-radius:18px;
    padding:40px;
    min-height:600px;
    box-shadow:0 8px 24px rgba(0,0,0,.06);
}

.ott-content h2{
    margin-top:0;
    font-size:32px;
}

.ott-content p{
    line-height:1.8;
}

@media(max-width:900px){
    .ott-course-player{
        flex-direction:column;
    }

    .ott-sidebar{
        width:100%;
        position:static;
    }
}

.active-lesson{
    display:block;
    background:#2563eb;
    color:#fff !important;
    font-weight:600;
    border-radius:10px;
}

.ott-lesson-meta{
    display:flex;
    gap:20px;
    margin:30px 0;
    flex-wrap:wrap;
}

.ott-meta-item{
    background:#f8fafc;
    border:1px solid #e5e7eb;
    border-radius:14px;
    padding:18px 22px;
    min-width:160px;
}

.ott-meta-label{
    display:block;
    font-size:12px;
    color:#6b7280;
    margin-bottom:6px;
    text-transform:uppercase;
    letter-spacing:.08em;
}

.ott-meta-item strong{
    font-size:18px;
}



.ott-lesson-nav{
    display:flex;
    justify-content:space-between;
    margin-top:40px;
    gap:16px;
}

.ott-nav-button{
    padding:12px 20px;
    border:1px solid #d1d5db;
    border-radius:10px;
    text-decoration:none;
    color:#111827;
    font-weight:600;
    transition:.2s;
}

.ott-nav-button:hover{
    background:#f3f4f6;
}

.ott-progress{
    margin-bottom:30px;
}

.ott-progress-bar{
    width:100%;
    height:8px;
    background:#e5e7eb;
    border-radius:999px;
    overflow:hidden;
    margin-bottom:10px;
}

.ott-progress-fill{
    height:100%;
    background:#2563eb;
    transition:width .3s ease;
}

.ott-live-card{
    margin:32px 0;
    padding:32px;
    border-radius:24px;
    background:linear-gradient(180deg,#ffffff,#f8fafc);
    border:1px solid #e5e7eb;
    box-shadow:0 20px 50px rgba(0,0,0,.08);
}

.ott-live-card h3{
    margin:0 0 10px;
    font-size:24px;
    color:#111827;
}

.ott-live-card p{
    color:#6b7280;
    line-height:1.7;
    margin-bottom:24px;
}

.ott-live-button{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    padding:14px 28px;
    border-radius:999px;
    background:#111827;
    color:#fff;
    text-decoration:none;
    font-weight:600;
    transition:.25s ease;
}

.ott-live-button:hover{
    transform:translateY(-2px);
    box-shadow:0 10px 25px rgba(17,24,39,.25);
}