/*Top of webpage*/
header{
    background:#ff6b6b;
    color:white;
    padding:20px;
    font-size:32px;
}

/* Navigation Bar */
nav{
    background:#ffa94d;
    padding:10px;
}

nav a{
    margin:0 20px;
    text-decoration:none;
    font-size:20px;
    color:white;
    font-weight:bold;
}
body{
    font-family: Arial, sans-serif;
    text-align:center;
    background:#1e3a5f;
    color:white;
    margin:0;
}
h1{
    margin-top:20px;
}
#gameArea{
    width:90%;
    height:400px;
    margin:20px auto;
    border:3px solid white;
    position:relative;
    background:#0b2545;
    overflow:hidden;
}

.star{
    position:absolute;
    font-size:40px;
    cursor:pointer;
}

#scoreboard{
    font-size:22px;
    margin-top:10px;
}

button{
    padding:10px 20px;
    font-size:18px;
    margin-top:10px;
    cursor:pointer;
    border:none;
    border-radius:6px;
    background:#ffd166;
}



/*Responsive Web Design*/
/* Universal Reset */
*{
    box-sizing: border-box;
    margin:0;
    padding:0;
}

/* Base Layout (Mobile First) */
body{
    font-family: "Comic Sans MS", Arial, sans-serif;
    line-height:1.6;
    padding:10px;
}
/* Banner */
header{
    width:100%;
    padding:20px;
    text-align:center;
    font-size:2rem;
}
/* Navigation */
nav{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:10px;
    padding:10px;
}
nav a{
    text-decoration:none;
    font-size:1.2rem;
    padding:8px 15px;
}
/* Content Area */
.container{
    max-width:1200px;
    margin:auto;
    padding:10px;
}
/* Letter blocks */
.letter{
    font-size:3rem;
    padding:15px;
    margin:10px;
    border-radius:10px;
    display:inline-block;
}

/* Math problem */

#problem{
    font-size:2.5rem;
    margin:20px 0;
}

input{
    font-size:1.5rem;
    padding:10px;
    width:100px;
    text-align:center;
}
button{
    padding:10px 15px;
    font-size:1.1rem;
    margin-top:10px;
}
/* Footer */
footer{
    text-align:center;
    padding:15px;
    margin-top:30px;
    font-size:1rem;
}

/* Tablet Screens */
@media (min-width: 600px){
    nav{
        flex-direction:row;
        justify-content:center;
    }
    .letter{
        font-size:4rem;
        padding:20px;
    }
    #problem{
        font-size:3rem;
    }
    button{
        font-size:1.2rem;
    }
}

/* Laptop Screens */

@media (min-width: 900px){
    header{
        font-size:2.5rem;
    }
    nav a{
        font-size:1.3rem;
    }
    .letter{
        font-size:5rem;
    }
    #problem{
        font-size:3.5rem;
    }
    .container{
        padding:20px;
    }
}

/* Large Desktop */
@media (min-width: 1200px){

    header{
        font-size:3rem;
    }
    nav a{
        font-size:1.5rem;
    }
    .letter{
        font-size:6rem;
        padding:25px;
    }
    #problem{
        font-size:4rem;
    }
    button{
        font-size:1.3rem;
    }
}