*{margin:0;padding:0;box-sizing:border-box;}
body{
font-family:Arial;
background:#111;
color:#fff;
}

.snow{
position:fixed;
width:100%;
height:100%;
opacity:0.1;
background-image:radial-gradient(#fff 1px,transparent 1px);
background-size:50px 50px;
}

.login-screen{
position:fixed;
width:100%;height:100%;
display:flex;
justify-content:center;
align-items:center;
background:#000;
}

.login-box{
background:#1a1a1a;
padding:40px;
border-radius:20px;
width:300px;
text-align:center;
}

input,textarea,button{
width:100%;
padding:12px;
margin-top:10px;
border:none;
border-radius:10px;
background:#222;
color:#fff;
}

button{background:#555;cursor:pointer;}

.sidebar{
position:fixed;
left:0;
top:0;
width:250px;
height:100%;
background:#1a1a1a;
padding:20px;
}

.main{
margin-left:260px;
padding:20px;
}

.tab{display:none;}
.tab.active{display:block;}

.tab-btn{
width:100%;
padding:12px;
margin-top:8px;
background:#222;
color:#fff;
border:none;
border-radius:10px;
cursor:pointer;
}

.tab-btn.active{background:#555;}

.application-card{
background:#1c1c1c;
padding:15px;
border-radius:15px;
margin-top:10px;
}

.hero{
text-align:center;
padding:60px;
}

#chatBox{
height:300px;
overflow:auto;
background:#1a1a1a;
padding:10px;
border-radius:10px;
margin-bottom:10px;
}