:root {
    --header-height: 3.5rem;

    /*========== Colors ==========*/
    /*Color mode HSL(hue, saturation, lightness)*/
    /* --first-color: hsl(230, 75%, 56%); */
    --first-color: hsl(347, 75%, 56%);
    --title-color: hsl(230, 75%, 15%);
    --text-color: hsl(230, 12%, 40%);
    /* --body-color: hsl(230, 100%, 98%); */
    --container-color: hsl(230, 100%, 97%);
    --border-color: hsl(230, 25%, 80%);

    /*========== Font and typography ==========*/
    /*.5rem = 8px | 1rem = 16px ...*/
    --body-font: "Syne", sans-serif;
    --h2-font-size: 1.25rem;
    --normal-font-size: .938rem;

    /*========== Font weight ==========*/
    --font-regular: 400;
    --font-medium: 500;
    --font-semi-bold: 600;

    /*========== z index ==========*/
    --z-fixed: 100;
    --z-modal: 1000;
}

/*========== Responsive typography ==========*/
@media screen and (min-width: 1023px) {
    :root {
        --h2-font-size: 1.5rem;
        --normal-font-size: 1rem;
    }
}

/*=============== BASE ===============*/
* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--body-color);
    color: var(--text-color);
}

input,
button {
    border: none;
    outline: none;
}

a {
    text-decoration: none;
}


/*=============== REUSABLE CSS CLASSES ===============*/

.prd__download {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    background-color: hsla(230, 75%, 15%, .1);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    /* For safari */
    padding: 8rem 1.5rem 0;
    opacity: 0;
    /* 在显示出来之前，无法被鼠标选中 */
    pointer-events: none;
    transition: opacity .4s;
}

.prd__download__close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    font-size: 1.5rem;
    color: var(--title-color);
    cursor: pointer;
}

.prd-btn {
    background-color:#dc002f; 
    margin-top:35%; 
    padding:10px; 
    color:#FFF;
    cursor: pointer;
}

/* Navigation for mobile devices */
@media screen and (max-width: 1023px) {
    .nav__menu {
        position: fixed;
        top: -100%;
        left: 0;
        background-color: var(--body-color);
        box-shadow: 0 8px 16px hsla(230, 75%, 32%, .15);
        width: 100%;
        padding-block: 4.5rem 4rem;
        transition: top .4s;
    }
}

/* Show menu */
.show-menu {
    top: 0;
}

/*=============== prd__download ===============*/
.prd__download__form,
.prd__download__group {
    display: grid;
}

.prd__download__form {
    background-color: var(--container-color);
    padding: 2rem 1.5rem 2.5rem;
    box-shadow: 0 8px 32px hsla(230, 75%, 15%, .2);
    border-radius: 1rem;
    row-gap: 1.25rem;
    text-align: center;
    transform: translateY(0);
    transition: transform .4s;
}

.prd__download__title {
    font-size: var(--h2-font-size);
    color: var(--title-color);
}

.prd__download__group {
    row-gap: 1rem;
}

.prd__download__label {
    display: block;
    text-align: initial;
    color: var(--title-color);
    font-weight: var(--font-medium);
    margin-bottom: .25rem;
}

.prd__download__input {
    width: 100%;
    background-color: var(--container-color);
    border: 2px solid var(--border-color);
    padding: 1rem;
    border-radius: .5rem;
    color: var(--text-color);
}

.prd__download__input::placeholder {
    color: var(--text-color);
}

.prd__download__signup {
    margin-bottom: .5rem;
}

.prd__download__signup a {
    color: var(--first-color);
}

.prd__download__forgot {
    display: inline-block;
    color: var(--first-color);
    margin-bottom: 1.25rem;
}

.prd__download__button {
    display: inline-block;
    background-color: var(--first-color);
    width: 100%;
    color: #fff;
    font-weight: var(--font-semi-bold);
    padding: 1rem;
    border-radius: .5rem;
    cursor: pointer;
    transition: box-shadow .4s;
}

.prd__download__button:hover {
    box-shadow: 0 4px 24px hsla(230, 75%, 40%, .4);
}

/* Show prd__download */
.show-prd__download {
    opacity: 1;
    pointer-events: initial;
}

.show-prd__download .prd__download__form {
    transform: translateY(5rem);
}

/*=============== BREAKPOINTS ===============*/
/* For medium devices */
@media screen and (min-width: 576px) {
    .prd__download {
        padding-top: 10rem;
    }

    .prd__download__close {
        width: max-content;
        top: 14.5rem;
        left: 37rem;
        right: 0;
        margin-inline: auto;
        font-size: 2rem;
    }

    .prd__download__form {
        max-width: 400px;
        margin-inline: auto;
    }
}

/* For large devices */
@media screen and (min-width: 1023px) {
    .prd__download__form {
        padding: 3rem 2rem 3.5rem;
    }
}

@media screen and (min-width: 1150px) {
    .container {
        margin-inline: auto;
    }
}