/* =========================================================
   Shared archive
   ========================================================= */

.kh-archive-header {
    max-width: 52rem;
}

.kh-inline-filter {
    border-radius: 1rem;
}

.kh-archive-results {
    min-height: 20rem;
    scroll-margin-top: 9rem;
    transition: opacity 150ms ease;
}

.kh-archive-results.is-loading {
    opacity: 0.45;
    pointer-events: none;
}

.kh-empty-state {
    padding: 4rem 1.5rem;
    text-align: center;
    border: 1px dashed var(--bs-border-color);
    border-radius: 1rem;
    background: var(--bs-tertiary-bg);
}

.kh-empty-state>i {
    color: var(--bs-secondary-color);
    font-size: 2.75rem;
}


/* =========================================================
   Shared resource cards
   ========================================================= */

.kh-resource-card {
    overflow: hidden;
    border-radius: 1rem;
    transition:
        transform 180ms ease,
        box-shadow 180ms ease;
}

.kh-resource-card:hover {
    transform: translateY(-0.25rem);
    box-shadow: var(--bs-box-shadow);
}

.kh-resource-card-image {
    display: block;
    position: relative;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: var(--bs-tertiary-bg);
}

.kh-resource-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 220ms ease;
}

.kh-resource-card:not(.kh-book-card):hover .kh-resource-card-image img {
    transform: scale(1.025);
}

.kh-resource-placeholder {
    display: grid;
    width: 100%;
    height: 100%;
    min-height: 12rem;
    place-items: center;
    color: var(--bs-secondary-color);
    background:
        linear-gradient(135deg,
            var(--bs-tertiary-bg),
            var(--bs-secondary-bg));
}

.kh-resource-placeholder i {
    font-size: 3rem;
}

.kh-resource-placeholder-large {
    min-height: 24rem;
    border-radius: 1rem;
}


/* =========================================================
   Book cards
   ========================================================= */

.kh-book-grid {
    --bs-gutter-x: 0.75rem;
    --bs-gutter-y: 1rem;
}

.kh-book-card {
    border-radius: 0.75rem;
}

.kh-book-card .kh-resource-card-image {
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 3 / 4;
    padding: 0.4rem;
    background: var(--bs-tertiary-bg);
}

.kh-book-card .kh-resource-card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.kh-book-card:hover .kh-resource-card-image img {
    transform: none;
}

.kh-book-card .card-body {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0.45rem;
    min-height: 4.8rem;
    padding: 0.75rem 0.5rem;
}

.kh-book-card h2 {
    width: 100%;
    margin: 0;
    text-align: center;
}

.kh-book-card h2 a {
    display: -webkit-box;
    overflow: hidden;
    line-height: 1.7;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}


.kh-book-lesson-chips {
    display: flex;
    position: relative;
    z-index: 2;
    width: 100%;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.25rem;
    pointer-events: none;
}

.kh-book-lesson-chip {
    display: inline-flex;
    max-width: 100%;
    min-height: 1.35rem;
    align-items: center;
    padding: 0.12rem 0.45rem;
    overflow: hidden;
    border: 1px solid var(
        --kh-book-chip-border,
        rgba(var(--bs-primary-rgb), 0.18)
    );
    border-radius: 999px;
    color: var(
        --kh-book-chip-color,
        var(--bs-primary-text-emphasis)
    );
    background: var(
        --kh-book-chip-bg,
        rgba(var(--bs-primary-rgb), 0.1)
    );
    font-size: 0.68rem;
    font-weight: 700;
    line-height: 1.45;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.kh-book-lesson-chip--1 {
    --kh-book-chip-border: rgba(13, 110, 253, 0.22);
    --kh-book-chip-color: #0a58ca;
    --kh-book-chip-bg: rgba(13, 110, 253, 0.11);
}

.kh-book-lesson-chip--2 {
    --kh-book-chip-border: rgba(111, 66, 193, 0.22);
    --kh-book-chip-color: #59359a;
    --kh-book-chip-bg: rgba(111, 66, 193, 0.11);
}

.kh-book-lesson-chip--3 {
    --kh-book-chip-border: rgba(25, 135, 84, 0.22);
    --kh-book-chip-color: #146c43;
    --kh-book-chip-bg: rgba(25, 135, 84, 0.11);
}

.kh-book-lesson-chip--4 {
    --kh-book-chip-border: rgba(253, 126, 20, 0.24);
    --kh-book-chip-color: #b55408;
    --kh-book-chip-bg: rgba(253, 126, 20, 0.12);
}

.kh-book-lesson-chip--5 {
    --kh-book-chip-border: rgba(214, 51, 132, 0.22);
    --kh-book-chip-color: #a52867;
    --kh-book-chip-bg: rgba(214, 51, 132, 0.1);
}

.kh-book-lesson-chip--6 {
    --kh-book-chip-border: rgba(13, 202, 240, 0.25);
    --kh-book-chip-color: #087990;
    --kh-book-chip-bg: rgba(13, 202, 240, 0.12);
}

.kh-book-lesson-chip--7 {
    --kh-book-chip-border: rgba(255, 193, 7, 0.28);
    --kh-book-chip-color: #8a6800;
    --kh-book-chip-bg: rgba(255, 193, 7, 0.14);
}

.kh-book-lesson-chip--8 {
    --kh-book-chip-border: rgba(220, 53, 69, 0.22);
    --kh-book-chip-color: #b02a37;
    --kh-book-chip-bg: rgba(220, 53, 69, 0.1);
}

[data-bs-theme="dark"] .kh-book-lesson-chip--1 {
    --kh-book-chip-color: #8bb9ff;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--2 {
    --kh-book-chip-color: #c5a7ff;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--3 {
    --kh-book-chip-color: #75d3a4;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--4 {
    --kh-book-chip-color: #ffb06b;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--5 {
    --kh-book-chip-color: #f08abf;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--6 {
    --kh-book-chip-color: #6edff6;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--7 {
    --kh-book-chip-color: #ffe083;
}

[data-bs-theme="dark"] .kh-book-lesson-chip--8 {
    --kh-book-chip-color: #ff9aa5;
}


/* =========================================================
   Book archive toolbar
   ========================================================= */

.kh-book-archive-container {
    padding-top: 0;
    padding-bottom: 3rem;
}

.kh-book-toolbar {
    position: sticky;
    z-index: 1020;
    top: 4.5rem;
    margin-inline: calc(var(--bs-gutter-x) * -0.5);
    border-bottom: 1px solid var(--bs-border-color);
    background: var(--bs-body-bg);
    box-shadow: 0 0.35rem 0.8rem rgb(0 0 0 / 0.04);
}

.kh-book-toolbar form {
    margin: 0;
}

.kh-book-toolbar-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 4rem;
    padding: 0.625rem calc(var(--bs-gutter-x) * 0.5);
}

.kh-book-search {
    min-width: 0;
    flex: 1 1 auto;
}

.kh-book-search .input-group-text,
.kh-book-search .form-control {
    min-height: 2.75rem;
    border-color: var(--bs-border-color);
    background: var(--bs-body-bg);
}

.kh-book-search .input-group-text {
    border-radius: 0 0.625rem 0.625rem 0;
}

.kh-book-search .form-control {
    border-radius: 0.625rem 0 0 0.625rem;
}

.kh-book-search .form-control:focus {
    position: relative;
    z-index: 3;
    border-color: var(--bs-primary);
    box-shadow:
        0 0 0 0.15rem rgba(var(--bs-primary-rgb), 0.15);
}

.kh-desktop-lesson-filter {
    width: 15rem;
    flex: 0 0 15rem;
}

.kh-desktop-lesson-filter .form-select {
    min-height: 2.75rem;
    border-radius: 0.625rem;
}

.kh-mobile-filter-button {
    width: 2.75rem;
    height: 2.75rem;
    flex: 0 0 2.75rem;
    padding: 0;
    border-radius: 0.625rem;
}

.kh-mobile-filter-button.is-active {
    color: var(--bs-primary-text-emphasis);
    border-color: var(--bs-primary);
    background: var(--bs-primary-bg-subtle);
}

.kh-clear-filter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    min-height: 2.75rem;
    flex: 0 0 auto;
    padding-inline: 0.6rem;
    white-space: nowrap;
    font-size: 0.8125rem;
}

.kh-book-page-content {
    padding-top: 1.25rem;
}


/* =========================================================
   Mobile lesson filter sheet
   ========================================================= */

.kh-book-filter-sheet {
    --bs-offcanvas-height: min(30rem,
            calc(100dvh - 0.75rem));
    --bs-offcanvas-zindex: 1100;

    height: var(--bs-offcanvas-height) !important;
    min-height: min(27rem,
            calc(100dvh - 0.75rem));
    max-height: calc(100dvh - 0.75rem);
    border-radius: 1.25rem 1.25rem 0 0;
}

.kh-book-filter-sheet .offcanvas-header {
    min-height: 4rem;
    flex: 0 0 4rem;
    padding-block: 0.75rem;
}

.kh-book-filter-sheet .offcanvas-body {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding:
        0.75rem 1rem calc(1rem + env(safe-area-inset-bottom));
}

.kh-mobile-lesson-list {
    display: grid;
    gap: 0.5rem;
}

.kh-mobile-lesson-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-height: 3.25rem;
    flex: 0 0 auto;
    padding: 0.75rem 1rem;
    cursor: pointer;
    border: 1px solid var(--bs-border-color);
    border-radius: 0.75rem;
    background: var(--bs-body-bg);
}

.kh-mobile-lesson-option:has(input:checked) {
    color: var(--bs-primary-text-emphasis);
    border-color: var(--bs-primary);
    background: var(--bs-primary-bg-subtle);
}

.kh-mobile-lesson-option input {
    width: 1.1rem;
    height: 1.1rem;
    flex: 0 0 auto;
    margin: 0;
}


/* =========================================================
   Resource detail pages
   ========================================================= */

.kh-detail-cover {
    max-width: 30rem;
    margin-inline: auto;
}

.kh-detail-cover img {
    width: 100%;
    height: auto;
}

.kh-detail-meta dt {
    color: var(--bs-secondary-color);
    font-weight: 500;
}

.kh-detail-meta dd {
    margin-bottom: 0.75rem;
}

.kh-download-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    padding: 1.25rem;
    border: 1px solid var(--bs-border-color);
    border-radius: 1rem;
    background: var(--bs-tertiary-bg);
}

.kh-stat-card {
    display: flex;
    min-width: 8rem;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--bs-border-color);
    border-radius: 1rem;
    background: var(--bs-body-bg);
}

.kh-stat-value {
    font-size: 1.35rem;
    font-weight: 700;
}

.kh-stat-label {
    color: var(--bs-secondary-color);
    font-size: 0.875rem;
}


/* =========================================================
   Desktop
   ========================================================= */

@media (min-width: 992px) {
    .kh-book-toolbar {
        top: 4.75rem;
        border: 1px solid var(--bs-border-color);
        border-top: 0;
        border-radius: 0 0 0.875rem 0.875rem;
    }

    .kh-book-toolbar-row {
        padding-inline: 0.75rem;
    }
}


/* =========================================================
   Tablet and mobile
   ========================================================= */

@media (max-width: 991.98px) {
    .kh-book-toolbar {
        top: 4rem;
    }
}


/* =========================================================
   Mobile
   ========================================================= */

@media (max-width: 575.98px) {
    .kh-book-toolbar-row {
        gap: 0.375rem;
        min-height: 3.5rem;
        padding-block: 0.375rem;
    }

    .kh-book-search .input-group-text,
    .kh-book-search .form-control {
        min-height: 2.5rem;
    }

    .kh-mobile-filter-button {
        width: 2.5rem;
        height: 2.5rem;
        flex-basis: 2.5rem;
    }

    .kh-clear-filter {
        width: 2.25rem;
        min-height: 2.5rem;
        padding: 0;
    }

    .kh-book-page-content {
        padding-top: 1rem;
    }

    .kh-book-card .card-body {
        min-height: 4.5rem;
        padding: 0.6rem 0.35rem;
    }

    .kh-book-card h2 {
        font-size: 0.82rem;
    }

    .kh-book-lesson-chip {
        max-width: 95%;
        min-height: 1.25rem;
        padding: 0.1rem 0.38rem;
        font-size: 0.62rem;
    }

    .kh-download-box {
        align-items: stretch;
        flex-direction: column;
    }

    .kh-download-box .btn {
        width: 100%;
    }

    .kh-stat-card {
        min-width: calc(50% - 0.5rem);
        flex-grow: 1;
    }
}


/* =========================================================
   Reduced motion
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

    .kh-resource-card,
    .kh-resource-card-image img,
    .kh-archive-results {
        transition: none;
    }

    .kh-resource-card:hover {
        transform: none;
    }

    .kh-resource-card:hover .kh-resource-card-image img {
        transform: none;
    }
}