rmcg.dev/projects/FrontendMentor/newbie/faq-accordion-card/css/style.css

/* 
Info: 
    desktop size 1440x768
    mobile size 375x768

*/

@import url("https://fonts.googleapis.com/css2?family=Kumbh+Sans:wght@400;700&display=swap");

:root {
    /* colors: */
    /* Text */
    --col-red-soft: hsl(14, 88%, 65%);
    --col-blue-very-dark-desaturated: hsl(238, 29%, 16%);
    --col-blue-very-dark-grayish: hsl(237, 12%, 33%);
    --col-blue-dark-grayish: hsl(240, 6%, 50%);

    /*  divider */
    --col-blue-light-grayish: hsl(240, 5%, 91%);

    /* background gradient */
    --col-violet-soft: hsl(273, 75%, 66%);
    --col-blue-soft: hsl(240, 73%, 65%);

    --clr-test: rgb(255, 111, 000);

    /* Fonts */
    --fs-12px: 0.75rem;
    --fw-400: 400;
    --fw-700: 700;
}

*,
::after,
::before {
    box-sizing: border-box;
}

html,
body,
main {
    min-height: 100vh;
    width: 100%;
}

/* Base page styling */

body {
    background: linear-gradient(
        180deg,
        var(--col-violet-soft) 0%,
        var(--col-blue-soft) 100%
    );
}

main {
    display: grid;
    align-content: center;
    justify-items: center;
}

.card {
    display: flex;
    flex-direction: column;
    font-family: "Kumbh Sans", sans-serif;

    background-color: white;
    width: 87%;
    border-radius: 23px;
    background-image: var(--card-image);
}

.card__header {
    text-align: center;
    font-weight: var(--fw-700);
    font-size: 2rem;
    line-height: 2.5rem;
}

.card__header_image {
    position: absolute;
    background-size: contain;
    content: url(../images/illustration-woman-online-mobile.svg);
    /* margin: 0 auto; */
    width: 237px;
    height: 180px;
    left: calc(50% - calc(237px / 2) - 10px);
    top: -20px;
    /* : calc(100% - 237px/2); */
    /* left: 40px; */
}

.card__header_image_shadow {
    background-image: url(../images/bg-pattern-mobile.svg);
    background-repeat: no-repeat;
    background-position: top center;
    border: 1px solid red;
}

@media screen and (min-width: 376px) {
    .card {
        flex-direction: row;
    }
    .card__header {
        text-align: start;
    }
}

.faq {
    margin-top: 6.125rem;
    /* border: 1px red solid; */
    color: var(--col-red-soft);
}

/* FAQ Section */

details {
    font-size: var(--fs-12px);
    line-height: 1.125rem;
    padding: 1rem 0 1rem 1.5rem;
    color: var(--col-blue-dark-grayish);

    border-bottom: 1px solid var(--col-blue-light-grayish);
    border-width: 75%;
}

summary {
    font-size: 0.8125rem;
    font-weight: var(--fw-400);
    line-height: 1rem;

    color: var(--col-blue-very-dark-grayish);
    /* padding: 1rem 1.5rem; */
    margin-bottom: 1rem;
    outline: none;
    /* border-radius: 0.25rem; */
    text-align: left;
    cursor: pointer;
    position: relative;
    display: block;
}

summary:hover {
    color: var(--col-red-soft);
}

details > summary::after {
    position: absolute;
    content: url(../images/icon-arrow-down.svg);
    right: 20px;
}
details[open] > summary {
    font-weight: var(--fw-700);
    color: var(--col-blue-very-dark-desaturated);
}
details[open] > summary::after {
    transform: rotate(180deg);
}

details > summary::-webkit-details-marker {
    display: none;
}

details[open] summary ~ * {
    animation: sweep 0.5s ease-in-out;
}
@keyframes sweep {
    0% {
        opacity: 0;
        margin-top: -10px;
    }
    100% {
        opacity: 1;
        margin-top: 0px;
    }
}