.project_header {
    padding: 4rem 0 2rem 0;
    border-bottom: 1px solid var(--c5);
}

.project_label {
    font-size: 0.75rem;
    color: var(--c4);
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.project_title {
    font-size: 3rem;
    margin: 0 0 1rem 0;
    line-height: 1.1;
}

.project_meta {
    display: flex;
    gap: 2rem;
    font-size: 0.8rem;
    color: var(--c4);
}

.project_meta span b {
    color: var(--c3);
    font-weight: normal;
}

/* tags */
    .project_tags {
        padding-top: 2rem;
        padding-bottom: 1rem;
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    .tag {
        font-size: 0.75rem;
        color: var(--c4);
        border: 1px solid var(--c5);
        padding: 2px 8px;
        transition: color 0.2s ease, border-color 0.2s ease;
    }

    .tag:hover {
        color: var(--c3);
        border-color: var(--c3);
    }

.project_grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 200px;
    gap: 1rem;
    padding: 4rem 0;
    border-bottom: 1px solid var(--c5);
}

.project_cell {
    position: relative;
    overflow: hidden;
}

.project_cell.tall  { grid-row: span 2; }
.project_cell.wide  { grid-column: span 2; }
.project_cell.big   { grid-column: span 2; grid-row: span 2; }

.project_cell a {
    display: block;
    width: 100%;
    height: 100%;
}

.project_cell img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
    display: block;
    filter: grayscale(0%);
    transition: filter 0.3s ease;
}

.project_cell:hover img {
    filter: grayscale(100%);
}

/*
.project_cell .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    color: var(--c1);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    text-align: center;
}

.project_cell:hover .overlay {
    opacity: 1;
}

.project_cell .overlay .title {
    font-size: 1.2rem;
    font-weight: bold;
    padding: 0 1rem;
}
*/

.project_desc {
    grid-template-columns: 1fr;
    gap: 1rem;
}

.desc_label {
    font-size: 0.75rem;
    color: var(--c4);
    letter-spacing: 0.1em;
    padding-top: 0.25rem;
}

.desc_text {
    color: var(--c3);
    line-height: 1.7;
}

.desc_text p + p {
    margin-top: 1rem;
}

.desc_text a{
    color: var(--c1);
    background: linear-gradient(to right, var(--c1) 50%, transparent 50%);
    background-size: 200% 100%;
    background-position: right;
    padding: 0px 4px;
    transition: background-position 0.2s ease, color 0.2s ease;
    border: 2px solid var(--c2);
}

.desc_text a:hover {
    background-position: left;
    color: var(--c2);
}

.desc_text a:active {
    background: transparent;
    color: var(--c1);
    border: 2px solid var(--c1);
}

.back_nav {
    position: fixed;
    bottom: 1rem;
    left: max(5vw, calc((100vw - 900px) / 2));
    transform: translateX(calc(-100% - 1.5rem));
    font-size: 0.8rem;
    z-index: 999;
}

.back_nav a {
    color: var(--c4);
    background: linear-gradient(to right, var(--c1) 50%, transparent 50%);
    background-size: 200% 100%;
    background-position: right;
    padding: 4px 0px;
    transition: background-position 0.2s ease, color 0.2s ease;
    border: 2px solid var(--c2);
}

.back_nav a:hover {
    background-position: left;
    color: var(--c2);
}

.back_nav a:active {
    background: transparent;
    color: var(--c1);
    border: 2px solid var(--c1);
}

/* reserved for embedded contents, either custom divs or iframes */
.project_embed {
    padding: 4rem 0;
    border-bottom: 1px solid var(--c5);
}

.embed_wrapper {
    position: relative;
    padding-top: 54.96%;
    width: 100%;
}

.embed_wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 8px;
}

/* reserved for the gallery type content pages */
.photo_header {
    padding: 4rem 0 2rem 0;
    border-bottom: 1px solid var(--c5);
}

.photo_month {
    padding: 3rem 0;
    border-bottom: 1px solid var(--c5);
}

.photo_month_header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.photo_month_label {
    font-size: 1.5rem;
    color: var(--c1);
}

.photo_month_year {
    font-size: 0.75rem;
    color: var(--c4);
    letter-spacing: 0.1em;
}

.photo_month_count {
    margin-left: auto;
    font-size: 0.7rem;
    color: var(--c4);
    letter-spacing: 0.05em;
}

.photo_grid {
    --columns: 4;
    --gap: 0.5rem;

    display: grid;
    grid-template-columns: repeat(var(--columns), 1fr);
    gap: var(--gap);
}

.photo_item {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1 / 1;
    border-radius: 4px;
}

.photo_item a {
    display: block;
    width: 100%;
    height: 100%;
}

.photo_item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: grayscale(0%);
    transition: filter 0.3s ease;
}

.photo_item:hover img {
    filter: grayscale(100%);
}

/* reserved for music tracks */
.music_header {
    padding: 4rem 0 2rem 0;
    border-bottom: 1px solid var(--c5);
}

.track_list {
    display: flex;
    flex-direction: column;
}

.track_entry {
    padding: 2rem 0;
    border-bottom: 1px solid var(--c5);
}

.track_meta {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.track_index {
    font-size: 0.7rem;
    color: var(--c4);
    min-width: 2ch;
}

.track_title {
    font-size: 1.25rem;
    color: var(--c1);
}

.track_year {
    font-size: 0.75rem;
    color: var(--c3);
    letter-spacing: 0.05em;
}

.track_tags {
    margin-left: auto;
    display: flex;
    gap: 0.4rem;
}

.track_embed iframe {
    display: block;
    width: 100%;
    border: 0;
}

.track_embed > div {
    display: none;
}

/* reserved for single images */
.single_image {
    display: flex;
    justify-content: center;
    padding: 4rem 0;
    border-bottom: 1px solid var(--c5);
}

.single_image a {
    display: block;
    max-width: 600px;
    width: 100%;
}

.single_image img {
    width: 100%;
    height: auto;
    display: block;
    filter: grayscale(0%);
    transition: filter 0.3s ease;
}

.single_image a:hover img {
    filter: grayscale(100%);
}