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

.main-div {
    margin: 2.5rem 3.5rem 0;
    display: grid;
    grid-template-columns: 4fr 2fr;
    height: 100vh;
    gap: 2rem;
    border-radius: 5px;
}

/* -----------nav------------ */
.menu {
    position: absolute;
    width: 100%;
}

/* -----------heading---------- */
.main-heading {
    color: var(--black);
    padding-top: 12rem;
    padding-bottom: 0;
    font-family: 'Black And White Picture', sans-serif;
    font-size: 6rem;
    text-align: center;
}

.main-heading+p {
    margin-top: 0;
    padding-top: 0;
    color: var(--black);
    text-align: center;
}

/* ----------------display video-------------------- */
.main-div .video-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--yellow);
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
}

.video-wrapper .display-video {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
    width: 90%;
    height: 90%;
}

.display-video iframe {
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.display-video h3 {
    background: linear-gradient(to left, var(--yellow), var(--pink));
    padding: .5rem 0 .5rem 1rem;
    font-size: 2rem;
    font-weight: bold;
}

/* ------------playlist------------- */
.video-playlist-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--yellow);
    border-radius: 8px;
    padding-block: 1em;
    overflow-y: scroll;
    overflow-x: hidden;
    /* firefox custom scrollbar */
    scrollbar-color: var(--black) var(--green);
    scrollbar-width: thin;
}

/* chrome, edge, safari, opera custom scrollbar  */
.video-playlist-wrapper::-webkit-scrollbar {
    width: .6rem;
}

.video-playlist-wrapper::-webkit-scrollbar-track {
    background-color: var(--green);
}

.video-playlist-wrapper::-webkit-scrollbar-thumb {
    background-color: var(--black);
}

.video-playlist-wrapper .video-thumbnail {
    width: 90%;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 1em;
    margin: 5px;
    padding-right: 1em;
    background-color: var(--green);
    border-radius: 8px;
    cursor: pointer;
}

.video-playlist-wrapper .video-thumbnail iframe {
    width: 60%;
    max-width: 100%;
    max-height: 100%;
    border-top-left-radius: 8px;
    border-bottom-left-radius: 8px;
}

.video-playlist-wrapper .video-thumbnail h3 {
    font-size: .8rem;
    font-weight: bold;
    flex: 1;
}

/* thumbnail on hover */
.video-playlist-wrapper .video-thumbnail:hover {
    background: var(--pink);
}

/* active thumbnail */
.video-playlist-wrapper .video-thumbnail.active {
    background: linear-gradient(45deg, var(--yellow), var(--pink));
}

.video-playlist-wrapper .video-thumbnail.active h3 {
    color: var(--black);
}

/* ------------footer----------------- */
footer {
    margin-top: 4rem;
    padding: 1rem 0 1.5rem;
    background: linear-gradient(to top, var(--yellow), var(--pink));
    color: var(--black);
    font-family: 'Fredoka One', monospace;
    font-size: .8rem;
    text-align: center;
}

/* ------------media queries-------------- */
@media (max-width: 900px) {
    .main-div {
        grid-template-columns: 1fr;
        grid-template-rows: 4fr 2fr;
    }
}

@media (max-width: 670px) {
    header {
        padding: 1.8rem 1.3rem .8rem;
    }

    .menu li {
        margin: 1.7rem 0;
    }

    .menu li a {
        padding: .6rem;
        font-size: 1rem;
    }

    .main-div {
        /* grid-template-columns: 1fr; */
        grid-template-rows: 2fr 4fr;
        margin: 0 .5rem;
    }

    .main-heading {
        font-size: 3.2rem;
    }

    .main-heading+p {
        font-size: .8rem;
    }

    .main-div .video-wrapper {
        height: 145%;
        padding: 1rem 0;
        margin-top: 1em;
    }

    .video-wrapper .display-video h3 {
        font-size: 1.3rem;
    }

    .main-div .video-playlist-wrapper {
        margin-top: 8.5rem;
    }

    footer {
        padding: 4rem 0 .8rem;
    }
}