:root {
    --d: 700ms;
    --e: cubic-bezier(0.19, 1, 0.22, 1);
}


/* =========================
   PAGE
========================= */

.page-content {
    display: grid;
    grid-gap: 1rem;
    padding: 1rem;
    max-width: 1024px;
    margin: 0 auto;
    font-family: var(--font-sans);
}

@media (min-width: 600px) {
    .page-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 800px) {
    .page-content {
        grid-template-columns: repeat(4, 1fr);
    }
}


/* =========================
   CARD
========================= */

.card {
    position: relative;
    display: flex;
    align-items: flex-end;
    width: 100%;
    height: 350px;
    overflow: hidden;
    padding: 1rem;
    text-align: center;
    color: whitesmoke;
    background-color: whitesmoke;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.1), 0 4px 4px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1), 0 16px 16px rgba(0, 0, 0, 0.1);
}


    /* =========================
   BACKGROUND IMAGE
========================= */

    .card:before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 110%;
        background-size: cover;
        background-position: center;
        transition: transform calc(var(--d) * 1.5) var(--e);
        pointer-events: none;
    }


    /* =========================
   OVERLAY
========================= */

    .card:after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 200%;
        pointer-events: none;
        background-image: linear-gradient( to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.009) 11.7%, rgba(0, 0, 0, 0.034) 22.1%, rgba(0, 0, 0, 0.072) 31.2%, rgba(0, 0, 0, 0.123) 39.4%, rgba(0, 0, 0, 0.182) 46.6%, rgba(0, 0, 0, 0.249) 53.1%, rgba(0, 0, 0, 0.32) 58.9%, rgba(0, 0, 0, 0.394) 64.3%, rgba(0, 0, 0, 0.468) 69.3%, rgba(0, 0, 0, 0.54) 74.1%, rgba(0, 0, 0, 0.607) 78.8%, rgba(0, 0, 0, 0.668) 83.6%, rgba(0, 0, 0, 0.721) 88.7%, rgba(0, 0, 0, 0.762) 94.1%, rgba(0, 0, 0, 0.79) 100% );
        transform: translateY(-50%);
        transition: transform calc(var(--d) * 2) var(--e);
    }


    /* =========================
   IMAGES
========================= */

    .card:nth-child(1):before {
        background-image: url(https://images.unsplash.com/photo-1517021897933-0e0319cfbc28?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    }

    .card:nth-child(2):before {
        background-image: url(https://images.unsplash.com/photo-1533903345306-15d1c30952de?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    }

    .card:nth-child(3):before {
        background-image: url(https://images.unsplash.com/photo-1545243424-0ce743321e11?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    }

    .card:nth-child(4):before {
        background-image: url(https://images.unsplash.com/photo-1531306728370-e2ebd9d7bb99?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ);
    }


/* =========================
   CONTENT
========================= */

.content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: 1rem;
    margin-top: 6rem;
    /*
     * ارتفاع ثابت ندهیم
     * تا محتوا در پایین کارت قرار بگیرد.
     */
    min-height: 0;
    transition: transform var(--d) var(--e);
}


    /* فاصله بین عناصر */

    .content > * + * {
        margin-top: 1rem;
    }


/* =========================
   TITLE
========================= */

.title {
    width: 100%;
    margin: 0;
    font-size: 1.3rem;
    font-weight: bold;
    line-height: 1.3;
    text-align: center;
}


/* =========================
   DESCRIPTION
========================= */

.copy {
    width: 100%;
    margin: 0;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-style: italic;
    line-height: 1.5;
    /*
     * حداکثر 3 خط
     */
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
}


/* =========================
   BUTTON
========================= */

.btn {
    cursor: pointer;
    margin-top: 1.5rem;
    min-height: 42px;
    padding: 0.75rem 1.5rem;
    font-size: 0.65rem;
    font-weight: bold;
    letter-spacing: 0.025rem;
    text-transform: uppercase;
    color: white;
    background-color: black;
    border: none;
    flex-shrink: 0;
    transition: background-color 0.2s ease;
}

    .btn:hover {
        background-color: #0d0d0d;
    }

    .btn:focus {
        outline: 1px dashed yellow;
        outline-offset: 3px;
    }


/* =========================
   DESKTOP HOVER
========================= */

@media (hover: hover) and (min-width: 600px) {

    .card:after {
        transform: translateY(0);
    }


    /*
     * در حالت عادی:
     * محتوا کاملاً پایین کارت است.
     *
     * فقط عنوان دیده می‌شود.
     */
    .content {
        transform: translateY(calc(100% - 4.5rem));
    }


        /*
     * متن و دکمه مخفی
     */
        .content > *:not(.title) {
            opacity: 0;
            transform: translateY(1rem);
            transition: transform var(--d) var(--e), opacity var(--d) var(--e);
        }


    /* =========================
       HOVER
    ========================= */

    .card:hover,
    .card:focus-within {
        align-items: center;
    }


        .card:hover:before,
        .card:focus-within:before {
            transform: translateY(-4%);
        }


        .card:hover:after,
        .card:focus-within:after {
            transform: translateY(-50%);
        }


        /*
     * کل محتوا بالا می‌آید
     */
        .card:hover .content,
        .card:focus-within .content {
            transform: translateY(0);
        }


            /*
     * متن و دکمه ظاهر می‌شوند
     */
            .card:hover .content > *:not(.title),
            .card:focus-within .content > *:not(.title) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: calc(var(--d) / 8);
            }


            .card:focus-within:before,
            .card:focus-within:after,
            .card:focus-within .content,
            .card:focus-within .content > *:not(.title) {
                transition-duration: 0s;
            }
}


/* =========================
   MOBILE
========================= */

@media (max-width: 599px) {

    .card {
        height: 300px;
    }

    .content {
        padding: 0.75rem;
    }

    .title {
        font-size: 1.2rem;
    }

    .copy {
        font-size: 1rem;
        line-height: 1.45;
        -webkit-line-clamp: 3;
    }

    .btn {
        min-height: 40px;
        padding: 0.65rem 1.25rem;
    }
}