*{
    box-sizing: border-box;
}

:root{
    --hue-normal: 200;
    --hue-wrong: 0;
    --hue-correct: 145;
}

body{
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    --hue: var(--hue-normal);
    background-color: hsl(var(--hue), 100%, 20%);
}

body.correct{
    --hue: var(--hue-correct);
}

body.wrong{
    --hue: var(--hue-wrong);
}

.container{
    width: 600px;
    max-width: 80%;
    background-color: white;
    border-radius: 5px;
    padding: 10px;
    box-shadow: 0 0 10px 2px;
    font-size: 2rem;
}
.btn-grid{
    display: grid;
    grid-template-columns: repeat(2, auto);
    gap: 10px;
    margin: 20px 0;
    
}
.btn{
    --hue:var(--hue-normal);
    border: 3px solid hsl(var(--hue), 100%, 30%);
    background-color: hsl(var(--hue), 100%, 50%);
    border-radius: 5px;
    padding: 5px 10px;
    color: white;
    outline: none;
    height: 50px;   
    font-size: 1.5rem;
}
.btn:hover{
    border-color: lightskyblue;
    cursor: pointer;
    transform: scale(0.97);
    transition: all 0.3s ease; 
}
.btn.correct{
    --hue: var(--hue-correct);
}
.btn.wrong{
    --hue: var(--hue-wrong);
}

.start-btn, .next-btn{
    font-size: 1.5rem;
    font-weight: bold;
    padding: 10px 20px;
}

.controls{
    display: flex;
    justify-content: center;
    align-items: center;
}
.return{
    display: flex;
    justify-content: flex-end;
}
#title{
    text-align: center;
}
.hide{
    display: none;
}

@media all and (max-width: 450px) {
    .btn{
        height: 35px;   
        font-size: 1rem;
    }
    .controls{
        margin-bottom: 10px;
    }
    .next-btn{
        font-size: 1rem;
    }