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

body{
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #023047;
}

.simple-interest-calc{
    width: 450px;
    padding: 25px;
    background: #e0e1dd;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

h1{
    text-align: center;
    margin-bottom: 10px;
}

.formula{
    text-align: center;
    margin-bottom: 20px;
    color: #666;
}

label{
    display: block;
    margin: 12px 0 5px;
    font-weight: bold;
}

input{
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    font-size: 16px;
    border-radius: 10px;
    transition: 0.3s ease-in;
}

/* input:hover, input:active{
    border-color: red;
} */

button{
    width: 48%;
    padding: 12px;
    margin-top: 20px;
    border: none;
    border-radius: 10px;
    background: #222;
    color: #ccc;
    font-size: 1.2rem;
    cursor: pointer;
    transition: 0.3 ease-in;
}

#calc{
    background: #222;
    transition: 0.3s ease-in;
}

#calc:hover{
    opacity: 0.8;
    color:black ;
    background: #57cc99;
}

button:hover{
    opacity: 0.8;
    color:black ;
    background: #57cc99;
}

#clear{
    background: #edf2f4;
    color: black;
    transition: 0.3s ease-in;
}


#clear:hover{
    opacity: 0.9;
    color: red;
    background: #222
}


.result{
    margin-top: 20px;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 10px;
}

.result p {
    margin: 8px 0;
    font-weight: bold;
}

.result span{
    float: right;
}

@media (max-width: 500px){
    body{
        padding: 15px;
    }

    .simple-interest-calc{
        width: 100%;
        max-width: 450px;
        padding: 20px;
    }

    h1{
        font-size: 24px;
    }


    .formula{
        font-size: 14px;
    }

    input{
        padding: 10px;
        font-size: 15px;
    }

    button{
        width: 100%;
        margin-top: 12px;
        font-size: 1rem;
    }

    .result{
        padding: 12px;
    }

    .result p{
        font-size: 14px;
    }
}