html,body{
margin:0;
padding:0;
height:100%;
background:black;
font-family:Segoe UI, Arial;
overflow:hidden;
color:white;
}

/* VIDEO */
#introVideo{
position:fixed;
width:100%;
height:100%;
object-fit:cover;
z-index:10;
}

/* MAIN */
#mainScreen{
display:none;
position:fixed;
width:100%;
height:100%;
}

/* 3D */
#bg3d{
position:absolute;
width:100%;
height:100%;
}

/* UI */
.ui{
position:absolute;
top:50%;
left:50%;
transform:translate(-50%,-50%);
text-align:center;
}

.logo{
width:200px;
border-radius:50%;
}

.title{
margin-top:15px;
font-weight:300;
letter-spacing:2px;
}

.glow{
animation:glow 2s infinite alternate;
}

@keyframes glow{
from{filter:drop-shadow(0 0 10px cyan);}
to{filter:drop-shadow(0 0 40px cyan);}
}

.menu{
margin-top:30px;
display:grid;
grid-template-columns:repeat(2,200px);
gap:20px;
}

.btn{
padding:15px;
background:rgba(0,0,0,0.6);
border:1px solid rgba(255,255,255,0.2);
cursor:pointer;
border-radius:8px;
transition:0.3s;
}

.btn:hover{
background:rgba(0,255,255,0.25);
box-shadow:0 0 15px cyan;
transform:scale(1.05);
}