@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
    user-select: none;
}

/* container */

.container {
    overflow: hidden;
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #4203a9, #90bafc);
    color: #fff;
    padding: 10px;
}

/* calculator div */

.calculator {
    width: 100%;
    max-width: 600px;
    margin-top: 10%;
    margin-left: 10%;
}

/* heading */

.calculator h1 {
    font-size: 60px;
}

.calculator h1 span {
    color: #ffff76;
}

/* input box */

.input-box {
    margin: 40px 0;
    padding: 35px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
}

.input-box input {
    flex: 1;
    margin-right: 20px;
    padding: 14px 20px;
    border: 0;
    outline: 0;
    font-size: 18px;
    border-radius: 5px;
    position: relative;
}

/* to make input box fully clickable */

.input-box input::-webkit-calendar-picker-indicator {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    height: auto;
    position: absolute;
    background-position: calc(100% - 10px);
    background-size: 30px;
    cursor: pointer;
}

/* calculate button */

.input-box button {
    background: #ffff76;
    border: 0;
    outline: 0;
    padding: 15px 30px;
    border-radius: 5px;
    font-weight: 500;
    color: #333;
    cursor: pointer;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

/* result age */

#result {
    font-size: 20px;
    margin-left: 10px;
}

#result span {
    color: #ffff76;
}

/* responsiveness */

@media (max-width: 1240px) {

    .calculator {
        margin: 120px;
    }
}

@media (max-width: 850px) {

    .calculator {
        margin: 120px 60px;
    }
}

@media (max-width: 730px) {

    .calculator {
        margin: 120px 30px;
    }
}

@media (max-width: 680px) {

    .calculator {
        margin: 150px 30px 0;
    }

    .calculator h1 {
        font-size: 50px;
    }

    .input-box {
        width: 500px;
        margin: 30px 0;
        padding: 25px;
    }
}

@media (max-width: 580px) {

    .calculator {
        margin: 170px 20px 0;
    }

    .calculator h1 {
        font-size: 40px;
    }

    .input-box {
        width: 450px;
        margin: 30px 0;
        padding: 25px;
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .input-box input {
        width: 100%;
        padding: 10px 15px;
    }

    .input-box button {
        padding: 10px 20px;
    }
}

@media (max-width: 500px) {

    .calculator h1 {
        font-size: 35px;
    }

    .input-box {
        width: 400px;
    }

    .input-box input {
        font-size: 16px;
    }

    #result {
        width: 390px;
        font-size: 18px;
    }
}

@media (max-width: 450px) {

    .calculator {
        margin: 200px 20px 0;
    }

    .calculator h1 {
        font-size: 30px;
    }

    .input-box {
        margin: 20px 0;
        width: 300px;
        padding: 15px;
        gap: 10px;
    }

    .input-box input {
        font-size: 16px;
    }

    #result {
        width: 290px;
        font-size: 17px;
    }
}

@media (max-width: 350px) {

    .calculator {
        margin: 200px 10px 0;
    }

    .input-box {
        width: 280px;
    }

    #result {
        width: 270px;
    }
}