@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

:root{
    --linear-gradient: linear-gradient(90deg, #38bdf8, #6d2bd9, #4c1d95);
}
*{
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

#container {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--linear-gradient);
    color: #d1d5db;
}

#calculator {
    background-color: #262626;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 10px 10px 10px rgba(0,0,0,0.323);
    display: flex;
    flex-direction: column;
    gap: 25px;
}

#calculator h2 {
    font-size: 30px;
    position: relative;
}

#calculator h2::before {
    position: absolute;
    content: '';
    height: 3px;
    width: 150px;
    background: var(--linear-gradient);
    bottom: 5px;
}

#input_box {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.input-field {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.input-field label {
    font-size: 15px;
    color: #c8ced6;
    font-weight: 500;
}

.input-field input  {
    background-color: transparent;
    border: none;
    border-bottom: 1px solid #4c1d95;
    color: #fff;
    font-size: 20px;
    padding: 5px;
}

.input-field input:focus {
    outline: none;
}

#result {
    text-align: center;
}

#total {
    font-size: 40px;
}

#calculate {
    background: var(--linear-gradient);
    border: none;
    padding: 10px;
    color:#fff;
    font-weight: bold;
    font-size: 18px;
    border-radius: 4px;
    cursor: pointer;
}

@media (max-width: 768px) {
    #calculator {
        padding: 20px;
        width: 90%;
    }
    
    #calculator h2 {
        font-size: 24px;
    }
}