*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{

    font-family:Arial, Helvetica, sans-serif;

    background:#f4f8fb;

    color:#222;
}

#app{

    min-height:100vh;
}

.screen{

    max-width:700px;

    margin:50px auto;

    background:white;

    padding:30px;

    border-radius:15px;

    box-shadow:0 5px 15px rgba(0,0,0,.1);

    text-align:center;

}

button{

    padding:12px 25px;

    margin:10px;

    border:none;

    border-radius:10px;

    cursor:pointer;

    font-size:16px;

    background:#4CAF50;

    color:white;

}

button:hover{

    opacity:.9;

}

.home-card{

    max-width:450px;

    margin:40px auto;

    background:#fff;

    border-radius:20px;

    padding:30px;

    text-align:center;

    box-shadow:0 10px 25px rgba(0,0,0,.1);

}

.profile-photo{

    width:160px;

    height:160px;

    border-radius:50%;

    object-fit:cover;

    border:5px solid #4CAF50;

}

.home-card h2{

    margin-top:20px;

}

.age{

    color:#666;

    margin-bottom:20px;

}

.menu{

    display:flex;

    flex-direction:column;

    gap:15px;

    margin:25px 0;

}

.menu button{

    width:100%;

    font-size:18px;

    padding:15px;

    border-radius:12px;

}

.welcome{

    margin-top:25px;

    padding:15px;

    background:#eef8ee;

    border-radius:10px;

}

#channelContainer{

    display:grid;

    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));

    gap:20px;

    margin:25px 0;

}

.channel-card{

    background:white;

    border-radius:15px;

    padding:20px;

    box-shadow:0 5px 15px rgba(0,0,0,.08);

    text-align:center;

    transition:.2s;

}

.channel-card:hover{

    transform:translateY(-3px);

}

.channel-icon{

    font-size:40px;

}

.category{

    color:#4CAF50;

    font-weight:bold;

    margin:10px 0;

}

.description{

    color:#666;

    font-size:14px;

    min-height:50px;

}

.channel-card button{

    margin-top:15px;

    width:100%;

}

#videoList{

    display:grid;

    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));

    gap:20px;

    margin:20px 0;

}

.video-card{

    background:white;

    border-radius:12px;

    overflow:hidden;

    cursor:pointer;

    box-shadow:0 4px 10px rgba(0,0,0,.1);

    transition:.2s;

}

.video-card:hover{

    transform:translateY(-4px);

}

.video-card img{

    width:100%;

    display:block;

}

.video-card h3{

    padding:12px;

    font-size:16px;

}

.video-card p{

    padding:0 12px 12px;

    color:#666;

}

.player-container{

    position:relative;

    width:100%;

    padding-top:56.25%;

    margin:20px 0;

    border-radius:15px;

    overflow:hidden;

    background:#000;

}

.player-container iframe{

    position:absolute;

    inset:0;

    width:100%;

    height:100%;

    border:0;

}