*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial,sans-serif;
}

body{
background:#0f172a;
color:white;
}

.top-header{
background:#111827;
padding:10px;
display:flex;
flex-direction:column;
align-items:center;
}

.main-logo{
width:100%;
max-width:900px;
border-radius:16px;
object-fit:contain;
}

.top-buttons{
display:flex;
gap:12px;
margin-top:15px;
flex-wrap:wrap;
justify-content:center;
}

button{
padding:14px 22px;
border:none;
border-radius:14px;
background:#2563eb;
color:white;
font-size:16px;
font-weight:bold;
cursor:pointer;
}

.pdf-fullscreen{
width:100%;
background:#111827;
padding:0;
margin-top:10px;
}

.pdf-frame{
width:100%;
height:100vh;
border:none;
background:white;
}

.container{
width:100%;
max-width:900px;
margin:auto;
padding:20px;
}

.card{
background:#1e293b;
padding:25px;
border-radius:20px;
margin-top:20px;
}

input,
select{
width:100%;
padding:15px;
margin-top:15px;
border:none;
border-radius:12px;
font-size:16px;
}

.option{
background:#334155;
padding:15px;
margin-top:15px;
border-radius:12px;
cursor:pointer;
}

.progress-bar{
height:12px;
background:#334155;
border-radius:20px;
margin:20px 0;
overflow:hidden;
}

#progressFill{
height:100%;
width:0%;
background:#22c55e;
}

.timer-box{
font-size:22px;
margin-bottom:20px;
}

.navigation-buttons{
display:flex;
gap:10px;
margin-top:20px;
flex-wrap:wrap;
}

@media(max-width:768px){

.main-logo{
width:100%;
}

.top-buttons{
width:100%;
}

.top-buttons a{
flex:1;
}

button{
width:100%;
}

.pdf-frame{
height:85vh;
}

}