.app-layout {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    height: 100dvh;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    transition: padding 0.25s ease-out;
    border-bottom: 1px solid var(--text-color);
}

body.category-open .header-content {
    padding: 0.5rem 2rem;
}

.app-layout h1 {
    font-size: clamp(1.5rem, 5vw, 5rem);
    font-family: 'Grenze Gotisch', serif;
    font-weight: 900;
    transition: font-size 0.25s ease-out;
}

body.category-open .app-layout h1 {
    font-size: clamp(1rem, 3vw, 2.5rem);
}

body.category-open .app-layout h1 {
    cursor: pointer;
}

main#nav-grid {
    display: grid;
    grid-template-columns: calc(50% - 0.5px) calc(50% - 0.5px);
    grid-template-rows: calc(50% - 0.5px) calc(50% - 0.5px);
    gap: 1px;
    margin: 0;
    list-style: none;
    position: relative;
    width: auto;
    height: auto;
    align-self: stretch;
    justify-self: stretch;
    background-color: var(--text-color);
    transition: grid-template-columns 0.25s ease-out, grid-template-rows 0.25s ease-out;
}

main#nav-grid.has-active.active-work {
    grid-template-columns: calc(100% - 2rem - 1px) 2rem;
    grid-template-rows: calc(100% - 2rem - 1px) 2rem;
}

main#nav-grid.has-active.active-play {
    grid-template-columns: 2rem calc(100% - 2rem - 1px);
    grid-template-rows: calc(100% - 2rem - 1px) 2rem;
}

main#nav-grid.has-active.active-thoughts {
    grid-template-columns: calc(100% - 2rem - 1px) 2rem;
    grid-template-rows: 2rem calc(100% - 2rem - 1px);
}

main#nav-grid.has-active.active-contact {
    grid-template-columns: 2rem calc(100% - 2rem - 1px);
    grid-template-rows: 2rem calc(100% - 2rem - 1px);
}

main#nav-grid > article {
    display: block;
    position: relative;
    background-color: var(--bg-color);
    overflow: hidden;
    transition: background-color 0.25s ease-out;
}

.category-bg {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.25s ease-out;
    z-index: 0;
}

.category-bg.bg-work {
    background-color: var(--color-work);
}

.category-bg.bg-play {
    background-color: var(--color-play);
}

.category-bg.bg-thoughts {
    background-color: var(--color-thoughts);
}

.category-bg.bg-contact {
    background-color: var(--color-contact);
}

main#nav-grid.has-active.active-work article:nth-child(1) .category-bg,
main#nav-grid.has-active.active-play article:nth-child(2) .category-bg,
main#nav-grid.has-active.active-thoughts article:nth-child(3) .category-bg,
main#nav-grid.has-active.active-contact article:nth-child(4) .category-bg {
    opacity: 1;
}

main#nav-grid.has-active.active-work article:nth-child(1) a.category-trigger,
main#nav-grid.has-active.active-play article:nth-child(2) a.category-trigger,
main#nav-grid.has-active.active-thoughts article:nth-child(3) a.category-trigger,
main#nav-grid.has-active.active-contact article:nth-child(4) a.category-trigger {
    /*color: white;
    mix-blend-mode: difference;*/
    color: var(--text-color);
    z-index: 10;
    pointer-events: none;
    isolation: isolate;
}

main#nav-grid.has-active.active-work article:nth-child(1) a.category-trigger .label,
main#nav-grid.has-active.active-play article:nth-child(2) a.category-trigger .label,
main#nav-grid.has-active.active-thoughts article:nth-child(3) a.category-trigger .label,
main#nav-grid.has-active.active-contact article:nth-child(4) a.category-trigger .label {
    pointer-events: auto;
    cursor: pointer;
}

main#nav-grid:not(.has-active) article:nth-child(1):hover {
    background-color: var(--color-work);
}

main#nav-grid:not(.has-active) article:nth-child(2):hover {
    background-color: var(--color-play);
}

main#nav-grid:not(.has-active) article:nth-child(3):hover {
    background-color: var(--color-thoughts);
}

main#nav-grid:not(.has-active) article:nth-child(4):hover {
    background-color: var(--color-contact);
}

main#nav-grid > article a.category-trigger {
    display: flex;
    width: 100%;
    height: 100%;
    padding: 2rem;
    text-decoration: none;
    color: var(--text-color);
    font-size: clamp(2rem, 10vw, 5rem);
    font-weight: 600;
    transition: var(--page-color-transition);
    font-family: 'VT323', monospace;
    z-index: 1;
    position: relative;
    box-sizing: border-box;
}

main#nav-grid > article a.category-trigger:focus-visible {
    outline-offset: -4px;
}

main#nav-grid > article a.category-trigger .label {
    overflow: hidden;
    white-space: nowrap;
}


main#nav-grid.has-active.active-work article#cell-work .category-content,
main#nav-grid.has-active.active-play article#cell-play .category-content,
main#nav-grid.has-active.active-thoughts article#cell-thoughts .category-content,
main#nav-grid.has-active.active-contact article#cell-contact .category-content {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: scale(1);
}

main#nav-grid .category-content {
    transform: scale(0.95);
    transition: opacity 0.25s ease-out, visibility 0.25s ease-out, transform 0.25s ease-out;
}


main#nav-grid.has-active.active-work article:not(:nth-child(1)) a .label,
main#nav-grid.has-active.active-play article:not(:nth-child(2)) a .label,
main#nav-grid.has-active.active-thoughts article:not(:nth-child(3)) a .label,
main#nav-grid.has-active.active-contact article:not(:nth-child(4)) a .label {
    opacity: 0;
    font-size: 0;
}

main#nav-grid.has-active.active-work article:nth-child(1),
main#nav-grid.has-active.active-play article:nth-child(2),
main#nav-grid.has-active.active-thoughts article:nth-child(3),
main#nav-grid.has-active.active-contact article:nth-child(4) {
    /* Keep default overflow: hidden so that expanding content like lightboxes stays within category bounds */
}

main#nav-grid > article a .label {
    position: relative;
}

main#nav-grid.active-work article:nth-child(4) a::before,
main#nav-grid.active-work article:nth-child(4) a::after,
main#nav-grid.active-play article:nth-child(3) a::before,
main#nav-grid.active-play article:nth-child(3) a::after,
main#nav-grid.active-thoughts article:nth-child(2) a::before,
main#nav-grid.active-thoughts article:nth-child(2) a::after,
main#nav-grid.active-contact article:nth-child(1) a::before,
main#nav-grid.active-contact article:nth-child(1) a::after {
    content: '';
    position: absolute;
    transition: all 0.25s ease-out;
}

main#nav-grid.active-work article:nth-child(4) a::before,
main#nav-grid.active-play article:nth-child(3) a::before,
main#nav-grid.active-thoughts article:nth-child(2) a::before,
main#nav-grid.active-contact article:nth-child(1) a::before {
    width: 0.8rem;
    height: 0.8rem;
    border: 0 solid currentColor;
}

main#nav-grid.active-work article:nth-child(4) a::after,
main#nav-grid.active-play article:nth-child(3) a::after,
main#nav-grid.active-thoughts article:nth-child(2) a::after,
main#nav-grid.active-contact article:nth-child(1) a::after {
    width: 2px;
    height: 1.6rem;
    background-color: currentColor;
}

/* Back labels */
main#nav-grid .back-label {
    position: absolute;
    opacity: 0;
    font-size: 1.15rem;
    line-height: 1;
    pointer-events: none;
    transition: opacity 0.25s ease-out;
    font-family: 'VT323', monospace;
    font-weight: 600;
}

/* When Work is active: Arrow is in Contact (4). Horizontally adjacent is Thoughts (3).
   Thoughts (3) is the wide strip at the bottom. Position label at the right edge. */
main#nav-grid.active-work article:nth-child(3) .back-label {
    opacity: 1;
    right: 0.45rem;
    top: 50%;
    transform: translateY(-50%);
    bottom: auto;
    left: auto;
}

/* When Play is active: Arrow is in Thoughts (3). Horizontally adjacent is Contact (4).
   Contact (4) is the wide strip at the bottom. Position label at the left edge. */
main#nav-grid.active-play article:nth-child(4) .back-label {
    opacity: 1;
    left: 0.45rem;
    top: 50%;
    transform: translateY(-50%);
    bottom: auto;
    right: auto;
}

/* When Thoughts is active: Arrow is in Play (2). Horizontally adjacent is Work (1).
   Work (1) is the wide strip at the top. Position label at the right edge. */
main#nav-grid.active-thoughts article:nth-child(1) .back-label {
    opacity: 1;
    right: 0.45rem;
    top: 50%;
    transform: translateY(-50%);
    bottom: auto;
    left: auto;
}

/* When Contact is active: Arrow is in Work (1). Horizontally adjacent is Play (2).
   Play (2) is the wide strip at the top. Position label at the left edge. */
main#nav-grid.active-contact article:nth-child(2) .back-label {
    opacity: 1;
    left: 0.45rem;
    top: 50%;
    transform: translateY(-50%);
    bottom: auto;
    right: auto;
}

/* ↘ Work Active */
main#nav-grid.active-work article:nth-child(4) a::before {
    border-width: 0 3px 3px 0;
    transform: translate(3px, 3px);
}

main#nav-grid.active-work article:nth-child(4) a::after {
    transform: rotate(-45deg);
}

/* ↙ Play Active */
main#nav-grid.active-play article:nth-child(3) a::before {
    border-width: 0 0 3px 3px;
    transform: translate(-3px, 3px);
}

main#nav-grid.active-play article:nth-child(3) a::after {
    transform: rotate(45deg);
}

/* ↗ Thoughts Active */
main#nav-grid.active-thoughts article:nth-child(2) a::before {
    border-width: 3px 3px 0 0;
    transform: translate(3px, -3px);
}

main#nav-grid.active-thoughts article:nth-child(2) a::after {
    transform: rotate(45deg);
}

/* ↖ Contact Active */
main#nav-grid.active-contact article:nth-child(1) a::before {
    border-width: 3px 0 0 3px;
    transform: translate(-3px, -3px);
}

main#nav-grid.active-contact article:nth-child(1) a::after {
    transform: rotate(-45deg);
}

main#nav-grid.hover-close.active-work article:nth-child(4) {
    background-color: var(--color-contact) !important;
}

main#nav-grid.hover-close.active-play article:nth-child(3) {
    background-color: var(--color-thoughts) !important;
}

main#nav-grid.hover-close.active-thoughts article:nth-child(2) {
    background-color: var(--color-play) !important;
}

main#nav-grid.hover-close.active-contact article:nth-child(1) {
    background-color: var(--color-work) !important;
}

main#nav-grid.hover-close.active-work article:nth-child(4) a,
main#nav-grid.hover-close.active-play article:nth-child(3) a,
main#nav-grid.hover-close.active-thoughts article:nth-child(2) a,
main#nav-grid.hover-close.active-contact article:nth-child(1) a {
    color: var(--text-color);
}

#center-close-hitbox {
    position: absolute;
    z-index: 100;
    cursor: pointer;
    border: none;
    background: transparent;
    display: none;
    font-family: 'VT323', monospace;
    font-size: clamp(2rem, 10vw, 5rem);
    font-weight: 600;
}

main#nav-grid.has-active #center-close-hitbox {
    display: block;
}

main#nav-grid.active-work #center-close-hitbox {
    bottom: 0;
    right: 0;
    width: calc(3.5rem + (var(--hitbox-text-chars) * 1ch) + 0.5ch);
    height: calc(3.5rem + 1.2em);
}

main#nav-grid.active-play #center-close-hitbox {
    bottom: 0;
    left: 0;
    width: calc(3.5rem + (var(--hitbox-text-chars) * 1ch) + 0.5ch);
    height: calc(3.5rem + 1.2em);
}

main#nav-grid.active-thoughts #center-close-hitbox {
    top: 0;
    right: 0;
    width: calc(3.5rem + (var(--hitbox-text-chars) * 1ch) + 0.5ch);
    height: calc(3.5rem + 1.2em);
}

main#nav-grid.active-contact #center-close-hitbox {
    top: 0;
    left: 0;
    width: calc(3.5rem + (var(--hitbox-text-chars) * 1ch) + 0.5ch);
    height: calc(3.5rem + 1.2em);
}

main#nav-grid.active-work article:nth-child(4) a.category-trigger,
main#nav-grid.active-play article:nth-child(3) a.category-trigger,
main#nav-grid.active-thoughts article:nth-child(2) a.category-trigger,
main#nav-grid.active-contact article:nth-child(1) a.category-trigger {
    align-items: center !important;
    justify-content: center !important;
    padding: 0 !important;
}

/* Collapse padded space around inactive SVGs */
main#nav-grid.has-active.active-work > article:not(:nth-child(1)) a.category-trigger,
main#nav-grid.has-active.active-play > article:not(:nth-child(2)) a.category-trigger,
main#nav-grid.has-active.active-thoughts > article:not(:nth-child(3)) a.category-trigger,
main#nav-grid.has-active.active-contact > article:not(:nth-child(4)) a.category-trigger {
    pointer-events: none;
    padding: 0 !important;
}

main#nav-grid > article:nth-child(1) a.category-trigger {
    align-items: flex-end;
    justify-content: flex-end;
}

main#nav-grid > article:nth-child(2) a.category-trigger {
    align-items: flex-end;
    justify-content: flex-start;
}

main#nav-grid > article:nth-child(3) a.category-trigger {
    align-items: flex-start;
    justify-content: flex-end;
}

main#nav-grid > article:nth-child(4) a.category-trigger {
    align-items: flex-start;
    justify-content: flex-start;
}

#center-close-hitbox:focus-visible {
    outline: none !important;
}

#center-close-hitbox:focus-visible::after {
    content: '';
    position: absolute;
    border: 2px dashed var(--text-color);
    height: 2.2rem;
    width: calc(2rem + (var(--hitbox-text-chars) * 1ch) + 1rem);
    pointer-events: none;
}

/* Custom focus ring placement for each active state */
main#nav-grid.active-work #center-close-hitbox:focus-visible::after {
    bottom: -0.1rem;
    right: -0.1rem;
}

main#nav-grid.active-play #center-close-hitbox:focus-visible::after {
    bottom: -0.1rem;
    left: -0.1rem;
}

main#nav-grid.active-thoughts #center-close-hitbox:focus-visible::after {
    top: -0.1rem;
    right: -0.1rem;
}

main#nav-grid.active-contact #center-close-hitbox:focus-visible::after {
    top: -0.1rem;
    left: -0.1rem;
}