:root{
    --bg:#0f0f0f;
    --text:#fff;
    --accent:#5b8cff;
}

body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto;
    background: linear-gradient(160deg,#111,#1a1a2f);
    color: var(--text);
}

.app{
    max-width:500px;
    margin:auto;
    min-height:100vh;
    display:flex;
    flex-direction:column;
}

.topbar{
    display:flex;
    align-items:center;
    gap:10px;
    padding:15px;
}

#exitBtn{
    background:none;
    border:none;
    color:white;
    font-size:20px;
    cursor:pointer;
}

.progress{
    flex:1;
    height:8px;
    background:rgba(255,255,255,0.1);
    border-radius:10px;
    overflow:hidden;
}

#progressBar{
    height:100%;
    width:0%;
    background:linear-gradient(90deg,#6cffc6,#5b8cff);
    transition:.4s;
}

.screen{
    display:none;
    padding:20px;
    animation:fade .4s ease;
}

.active{
    display:block;
}

.quiz-list{
    display:flex;
    flex-direction:column;
    gap:15px;
}

.quiz-card{
    padding:20px;
    border-radius:18px;
    border:none;
    font-size:18px;
    font-weight:600;
    cursor:pointer;
    color:white;
    background: linear-gradient(135deg,#5b8cff,#6cffc6);
    box-shadow:0 8px 15px rgba(0,0,0,0.2);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    text-align:center;
}

.quiz-card:hover{
    transform: scale(1.05);
    box-shadow:0 12px 20px rgba(0,0,0,0.3);
}

.quiz-card:active{
    transform: scale(0.97);
    box-shadow:0 6px 10px rgba(0,0,0,0.25);
}

.answer{
    padding:16px;
    border:none;
    border-radius:12px;
    font-size:16px;
    cursor:pointer;
    background:rgba(255,255,255,0.08);
    color:white;
    transition:.2s;
}

.answer:hover{
    transform:scale(1.02);
}
#resultQScreen{
    padding:25px;
    margin-top:20px;
    text-align:center;
    animation:fade .4s ease;
}

#resultIcon{
    font-size:80px;
    margin-bottom:10px;
    animation:pop .5s;
}

#resultTitle{
    font-size:24px;
    margin-bottom:10px;
}

#resultText{
    font-size:16px;
    color:white;
}

#nextBtn{
    display:block; /* скроется и покажется через JS */
    margin:20px auto 0 auto;
    padding:16px 25px;
    border:none;
    border-radius:14px;
    font-size:18px;
    cursor:pointer;
    background:linear-gradient(90deg,#6cffc6,#5b8cff);
    color:black;
    transition:.2s;
}

#nextBtn:hover{
    transform:scale(1.03);
}

.correct{
    background:#2ecc71;
}

.wrong{
    background:#e74c3c;
}

#nextBtn{
	display: none;
    margin-top:20px;
    padding:16px 25px;
    border:none;
    border-radius:14px;
    font-size:18px;
    cursor:pointer;
    background:linear-gradient(90deg,#6cffc6,#5b8cff);
    color:black;
}

@keyframes fade{
    from{opacity:0;transform:translateY(15px);}
    to{opacity:1;transform:translateY(0);}
}