@import url("https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap");
* {
    margin: 0;
    padding: 0;
    outline: none;
    font-family: "Poppins", sans-serif;
}
:root {
    --primary: #333;
    --secondary: #333;
    --errorColor: red;
    --stepNumber: 6;
    --containerWidth: 600px;
    --bgColor: #333;
    --inputBorderColor: lightgray;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow-x: hidden;
    background: var(--bgColor);
}
::selection {
    color: #fff;
    background: var(--primary);
}
.container {
    width: var(--containerWidth);
    background: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 50px 35px 10px 35px;
}
.container header {
    font-size: 35px;
    font-weight: 600;
    margin: 0 0 30px 0;
}
.container .form-outer {
    width: 100%;
    overflow: hidden;
}
.container .form-outer form {
    display: flex;
    width: calc(100% * var(--stepNumber));
}
.form-outer form .page {
    width: calc(100% / var(--stepNumber));
    transition: margin-left 0.3s ease-in-out;
}
.form-outer form .page .title {
    text-align: left;
    font-size: 25px;
    font-weight: 500;
}
.form-outer form .page .field {
    width: var(--containerWidth);
    height: 45px;
    margin: 45px 0;
    display: flex;
    position: relative;
}
form .page .field .label {
    position: absolute;
    top: -30px;
    font-weight: 500;
}
form .page .field input {
    box-sizing: border-box;
    height: 100%;
    width: 100%;
    border: 1px solid var(--inputBorderColor);
    border-radius: 5px;
    padding-left: 15px;
    margin: 0 1px;
    font-size: 18px;
    transition: border-color 150ms ease;
}
form .page .field input.invalid-input {
    border-color: var(--errorColor);
}
form .page .field select {
    width: 100%;
    padding-left: 10px;
    font-size: 17px;
    font-weight: 500;
}
form .page .field button {
    width: 100%;
    height: calc(100% + 5px);
    border: none;
    background: var(--secondary);
    margin-top: -20px;
    border-radius: 5px;
    color: #fff;
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: 0.5s ease;
}
form .page .field button:hover {
    background: #000;
}
form .page .btns button {
    margin-top: -20px !important;
}
form .page .btns button.prev {
    margin-right: 3px;
    font-size: 17px;
}
form .page .btns button.next {
    margin-left: 3px;
}
.container .progress-bar {
    display: flex;
    margin: 40px 0;
    user-select: none;
}
.container .progress-bar .step {
    text-align: center;
    width: 100%;
    position: relative;
}
.container .progress-bar .step p {
    font-weight: 500;
    font-size: 18px;
    color: #000;
    margin-bottom: 8px;
}
.progress-bar .step .bullet {
    height: 25px;
    width: 25px;
    border: 2px solid #000;
    display: inline-block;
    border-radius: 50%;
    position: relative;
    transition: 0.2s;
    font-weight: 500;
    font-size: 17px;
    line-height: 25px;
}
.progress-bar .step .bullet.active {
    border-color: var(--primary);
    background: var(--primary);
}
.progress-bar .step .bullet span {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}
.progress-bar .step .bullet.active span {
    display: none;
}
.progress-bar .step .bullet:before,
.progress-bar .step .bullet:after {
    position: absolute;
    content: "";
    bottom: 11px;
    right: -51px;
    height: 3px;
    width: 44px;
    background: #262626;
}
.progress-bar .step .bullet.active:after {
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    animation: animate 0.3s linear forwards;
}
@keyframes animate {
    100% {
        transform: scaleX(1);
    }
}
.progress-bar .step:last-child .bullet:before,
.progress-bar .step:last-child .bullet:after {
    display: none;
}
.progress-bar .step p.active {
    color: var(--primary);
    transition: 0.2s linear;
}
.progress-bar .step .check {
    position: absolute;
    left: 50%;
    top: 70%;
    font-size: 15px;
    transform: translate(-50%, -50%);
    display: none;
}
.progress-bar .step .check.active {
    display: block;
    color: #fff;
}

@media screen and (max-width: 660px) {
    :root {
        --containerWidth: 400px;
    }
    .progress-bar .step p {
        display: none;
    }
    .progress-bar .step .bullet::after,
    .progress-bar .step .bullet::before {
        display: none;
    }
    .progress-bar .step .bullet {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .progress-bar .step .check {
        position: absolute;
        left: 50%;
        top: 50%;
        font-size: 15px;
        transform: translate(-50%, -50%);
        display: none;
    }
    .step {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}
@media screen and (max-width: 490px) {
    :root {
        --containerWidth: 100%;
    }
    .container {
        box-sizing: border-box;
        border-radius: 0;
    }
}

initMultiStepForm();

function initMultiStepForm() {
    const progressNumber = document.querySelectorAll(".step").length;
    const slidePage = document.querySelector(".slide-page");
    const submitBtn = document.querySelector(".submit");
    const progressText = document.querySelectorAll(".step p");
    const progressCheck = document.querySelectorAll(".step .check");
    const bullet = document.querySelectorAll(".step .bullet");
    const pages = document.querySelectorAll(".page");
    const nextButtons = document.querySelectorAll(".next");
    const prevButtons = document.querySelectorAll(".prev");
    const stepsNumber = pages.length;

    if (progressNumber !== stepsNumber) {
        console.warn(
            "Error, number of steps in progress bar do not match number of pages"
        );
    }

    document.documentElement.style.setProperty("--stepNumber", stepsNumber);

    let current = 1;

    for (let i = 0; i < nextButtons.length; i++) {
        nextButtons[i].addEventListener("click", function (event) {
            event.preventDefault();

            inputsValid = validateInputs(this);
            // inputsValid = true;

            if (inputsValid) {
                slidePage.style.marginLeft = `-${
                    (100 / stepsNumber) * current
                }%`;
                bullet[current - 1].classList.add("active");
                progressCheck[current - 1].classList.add("active");
                progressText[current - 1].classList.add("active");
                current += 1;
            }
        });
    }

    for (let i = 0; i < prevButtons.length; i++) {
        prevButtons[i].addEventListener("click", function (event) {
            event.preventDefault();
            slidePage.style.marginLeft = `-${
                (100 / stepsNumber) * (current - 2)
            }%`;
            bullet[current - 2].classList.remove("active");
            progressCheck[current - 2].classList.remove("active");
            progressText[current - 2].classList.remove("active");
            current -= 1;
        });
    }
    submitBtn.addEventListener("click", function () {
        bullet[current - 1].classList.add("active");
        progressCheck[current - 1].classList.add("active");
        progressText[current - 1].classList.add("active");
        current += 1;
        setTimeout(function () {
            alert("Your Form Successfully Signed up");
            location.reload();
        }, 800);
    });

    function validateInputs(ths) {
        let inputsValid = true;

        const inputs =
            ths.parentElement.parentElement.querySelectorAll("input");
        for (let i = 0; i < inputs.length; i++) {
            const valid = inputs[i].checkValidity();
            if (!valid) {
                inputsValid = false;
                inputs[i].classList.add("invalid-input");
            } else {
                inputs[i].classList.remove("invalid-input");
            }
        }
        return inputsValid;
    }
}