/*
 * Page shell and page header (templates/base.html, partials/page_header.html).
 * Theme variables only: these rules run under all 32 themes, and the header
 * navbar is data-bs-theme="dark" everywhere, so nothing here keys on a theme.
 *
 * Rhythm: tight inside the header (title, subtitle and count line read as one
 * unit), generous below it (the header is separate from the page's content).
 */

/* ---- Shell ------------------------------------------------------------ */

.clu-shell {
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
}

/* Cover grids use the whole width; the gutter grows with the screen so the
   first column of covers never touches the window edge. */
.clu-shell.clu-shell-wide {
    padding-inline: clamp(0.75rem, 2.5vw, 2.5rem);
}

/* The nav and footer on a wide page (core/page_width.py): the same gutter as
   the shell, so the brand lines up with the first column of covers. */
.clu-shell-wide-chrome {
    padding-inline: clamp(0.75rem, 2.5vw, 2.5rem);
}

/* ---- Header ----------------------------------------------------------- */

.clu-page-header {
    margin-bottom: 1.5rem;
}

.clu-page-crumbs .breadcrumb {
    /* Some themes (Minty, Sketchy...) paint breadcrumbs as a filled bar; in
       the header it is a quiet line of links. */
    --bs-breadcrumb-bg: transparent;
    --bs-breadcrumb-padding-x: 0;
    --bs-breadcrumb-padding-y: 0;
    --bs-breadcrumb-border-radius: 0;
    --bs-breadcrumb-divider-color: var(--bs-secondary-color);
    --bs-breadcrumb-item-active-color: var(--bs-secondary-color);
    margin-bottom: 0.25rem;
    padding: 0;
    background: none;
    border: 0;
    font-size: 0.875rem;
}

.clu-page-crumbs .breadcrumb {
    flex-wrap: nowrap;
    min-width: 0;
}

.clu-page-crumbs .breadcrumb-item {
    flex: 0 0 auto;
    white-space: nowrap;
}

/* The current item is the same text as the title below it, so it is the
   one that gives way on a narrow screen. */
.clu-page-crumbs .breadcrumb-item:last-child {
    flex: 0 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

.clu-page-crumbs .breadcrumb-item a {
    color: var(--bs-link-color);
}

.clu-page-crumbs .breadcrumb-item + .breadcrumb-item::before {
    color: var(--bs-secondary-color);
}

.clu-page-crumbs .breadcrumb-item.active {
    color: var(--bs-secondary-color);
}

/* A one-item breadcrumb ("Library" at the top level, "Select a library"
   before one is picked) only repeats the title; show the path once it is
   a path. JS-built breadcrumbs grow and shrink, so this cannot be decided
   in the template. */
.clu-page-crumbs:has(> .breadcrumb > li:only-child),
.clu-page-crumbs:has(> .breadcrumb:empty) {
    display: none;
}

.clu-page-header-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem 1rem;
}

.clu-page-title {
    flex: 1 1 auto;
    min-width: 0;
    margin: 0;
    color: var(--bs-emphasis-color);
    font-size: calc(1.3rem + 0.6vw);
    font-weight: 500;
    line-height: 1.2;
    text-wrap: balance;
}

.clu-page-title .bi {
    margin-inline-end: 0.5rem;
    font-size: 0.85em;
}

@media (min-width: 1200px) {
    .clu-page-title {
        font-size: 1.75rem;
    }
}

.clu-page-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* Inline buttons never break their label over two lines. */
.clu-page-actions > .btn,
.clu-page-actions > .btn-group > .btn,
.clu-page-actions > .dropdown > .btn {
    white-space: nowrap;
}

/* "Small grey outline buttons" means grey on every theme. Several themes
   make secondary a brand colour (Minty: pink at about 2:1 on white) or a
   grey that vanishes into the page (Darkly: about 1.6:1), so the shared
   header, empty states, any .clu-neutral-buttons region (App Settings) and
   .clu-choice option cards take their neutral from the text and border
   tokens instead of --bs-secondary. */
.clu-page-actions .btn-outline-secondary,
.clu-empty-actions .btn-outline-secondary,
.clu-neutral-buttons .btn-outline-secondary,
.btn-outline-secondary.clu-choice {
    --bs-btn-color: var(--bs-body-color);
    --bs-btn-border-color: color-mix(in srgb, var(--bs-body-color) 35%, transparent);
    --bs-btn-hover-color: var(--bs-emphasis-color);
    --bs-btn-hover-bg: var(--bs-secondary-bg);
    --bs-btn-hover-border-color: color-mix(in srgb, var(--bs-body-color) 45%, transparent);
    --bs-btn-active-color: var(--bs-emphasis-color);
    --bs-btn-active-bg: var(--bs-tertiary-bg);
    --bs-btn-active-border-color: color-mix(in srgb, var(--bs-body-color) 55%, transparent);
    --bs-btn-disabled-color: var(--bs-secondary-color);
    --bs-btn-disabled-border-color: var(--bs-border-color);
    /* Bootswatch themes such as Minty set color and border-color on the
       class itself, not through the variables. */
    color: var(--bs-btn-color);
    border-color: var(--bs-btn-border-color);
}

.clu-page-actions .btn-outline-secondary:hover,
.clu-empty-actions .btn-outline-secondary:hover,
.clu-neutral-buttons .btn-outline-secondary:hover,
.btn-outline-secondary.clu-choice:hover {
    color: var(--bs-btn-hover-color);
    background-color: var(--bs-btn-hover-bg);
    border-color: var(--bs-btn-hover-border-color);
}

.clu-page-actions .btn-outline-secondary:is(:active, .active, .show),
.clu-empty-actions .btn-outline-secondary:is(:active, .active, .show),
.clu-neutral-buttons .btn-outline-secondary:is(:active, .active, .show),
.btn-outline-secondary.clu-choice:is(:active, .active, .show) {
    color: var(--bs-btn-active-color);
    background-color: var(--bs-btn-active-bg);
    border-color: var(--bs-btn-active-border-color);
}

.clu-page-actions .btn-outline-secondary:disabled,
.clu-empty-actions .btn-outline-secondary:disabled,
.clu-neutral-buttons .btn-outline-secondary:disabled,
.btn-outline-secondary.clu-choice:disabled {
    color: var(--bs-btn-disabled-color);
    border-color: var(--bs-btn-disabled-border-color);
}

/* A chosen option (a radio drawn as a button, or a .clu-choice card) is
   marked like a selected cover: the primary pushed 30% toward the emphasis
   colour (collection.css --clu-select), so a muted primary such as Darkly's
   still shows. A 2px edge and a light wash of the same colour. */
.clu-neutral-buttons .btn-check:checked + .btn-outline-secondary,
.btn-check:checked + .btn-outline-secondary.clu-choice {
    --clu-choice-select: color-mix(in srgb, var(--bs-primary) 70%, var(--bs-emphasis-color));
    color: var(--bs-emphasis-color);
    background-color: color-mix(in srgb, var(--clu-choice-select) 18%, transparent);
    border-color: var(--clu-choice-select);
    box-shadow: inset 0 0 0 1px var(--clu-choice-select);
}

/* Keep the keyboard focus ring on a chosen option. */
.clu-neutral-buttons .btn-check:checked:focus-visible + .btn-outline-secondary,
.btn-check:checked:focus-visible + .btn-outline-secondary.clu-choice {
    box-shadow: inset 0 0 0 1px var(--clu-choice-select), var(--bs-btn-focus-box-shadow);
}

/* Code inside an alert takes the alert's text colour: the theme's code pink
   is not made for an info or warning fill. The mono face still sets it apart. */
.alert code {
    color: inherit;
}

/* The More menu is always rendered so phones have somewhere to fold the
   secondary actions into; it only shows when it holds something. */
.clu-page-more-empty:not(.clu-page-more-folded) {
    display: none;
}

/* Folded buttons carry me-1 icons, menu items me-2: give every menu icon one
   fixed slot so the labels line up. */
.clu-page-more .dropdown-item > .bi:first-child {
    display: inline-block;
    width: 1.25em;
    margin-inline-end: 0.5rem !important;
}

.clu-page-sub {
    max-width: 75ch;
    margin: 0.25rem 0 0;
    color: var(--bs-secondary-color);
}

.clu-page-stats {
    margin: 0.25rem 0 0;
    color: var(--bs-secondary-color);
    font-size: 0.875rem;
    font-variant-numeric: tabular-nums;
}

.clu-stat + .clu-stat::before {
    content: "\00B7";
    margin-inline: 0.5rem;
    color: var(--bs-secondary-color);
}

.clu-stat-value {
    color: var(--bs-emphasis-color);
    font-weight: 600;
}

a.clu-stat {
    color: inherit;
    text-decoration: none;
}

a.clu-stat:hover .clu-stat-value,
a.clu-stat:focus-visible .clu-stat-value {
    text-decoration: underline;
    text-underline-offset: 0.2em;
}

/* "How this works": the page's explanation, one click away. Native
   <details>, so it opens from the keyboard and needs no script. */
.clu-page-help {
    max-width: 75ch;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.clu-page-help > summary {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--bs-link-color);
    cursor: pointer;
    list-style: none;
    border-radius: var(--bs-border-radius-sm);
}

.clu-page-help > summary::-webkit-details-marker {
    display: none;
}

.clu-page-help > summary:hover {
    color: var(--bs-link-hover-color);
    text-decoration: underline;
    text-underline-offset: 0.2em;
}

.clu-page-help > summary:focus-visible {
    outline: 0;
    box-shadow: var(--bs-focus-ring-x, 0) var(--bs-focus-ring-y, 0) var(--bs-focus-ring-blur, 0)
        var(--bs-focus-ring-width) var(--bs-focus-ring-color);
}

.clu-page-help > summary .bi {
    font-size: 0.75em;
    transition: transform 0.15s ease-out;
}

.clu-page-help[open] > summary .bi {
    transform: rotate(90deg);
}

.clu-page-help-body {
    margin-top: 0.5rem;
    padding-inline-start: 1.125rem;
    color: var(--bs-secondary-color);
}

.clu-page-help-body > :last-child {
    margin-bottom: 0;
}

.clu-page-help-body p {
    margin-bottom: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
    .clu-page-help > summary .bi {
        transition: none;
    }
}

/* ---- Empty states (partials/empty_state.html, CLU.emptyState) ------- */

.clu-empty {
    max-width: 40rem;
    margin-inline: auto;
    padding: 3rem 1rem;
    text-align: center;
}

.clu-empty-icon {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--bs-secondary-color);
    font-size: 2.5rem;
    line-height: 1;
}

.clu-empty-title {
    margin: 0 0 0.375rem;
    color: var(--bs-emphasis-color);
    font-size: 1.25rem;
    font-weight: 500;
    text-wrap: balance;
}

.clu-empty-text {
    max-width: 60ch;
    margin: 0 auto;
    color: var(--bs-secondary-color);
    text-wrap: pretty;
}

.clu-empty-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
}

.clu-empty-compact {
    padding: 1.5rem 1rem;
}

.clu-empty-compact .clu-empty-icon {
    font-size: 1.75rem;
}

.clu-empty-success .clu-empty-icon {
    color: var(--bs-success-text-emphasis);
}

/* ---- Toasts (static/js/clu-toast.js) --------------------------------- */

.clu-toasts {
    /* Never wider than the phone it is on. */
    max-width: 100%;
}

.clu-toast {
    width: min(var(--bs-toast-max-width, 350px), calc(100vw - 2rem));
}

.clu-toast .toast-body {
    overflow-wrap: anywhere;
}

/* Messages are text; a newline in one is a line break. */
.clu-toast-text {
    white-space: pre-line;
}

.clu-toast-icon {
    flex: none;
    margin-top: 0.125rem;
}

.clu-toast-close {
    flex: none;
    align-self: flex-start;
    margin: 0.375rem 0.375rem 0 0;
    padding: 0.25rem 0.375rem;
    border: 0;
    border-radius: var(--bs-border-radius-sm);
    background: transparent;
    color: inherit;
    line-height: 1;
    opacity: 0.7;
}

.clu-toast-close:hover {
    opacity: 1;
}

.clu-toast-close:focus-visible {
    opacity: 1;
    outline: 2px solid currentColor;
    outline-offset: 1px;
}

/* Phone: the secondaries have folded into More (clu-page.js), so title +
   primary + More normally share one line. When the actions still don't fit
   (an action the page's JS restyles stays inline via data-clu-keep), they
   drop to their own line under the title rather than push the page sideways. */
@media (max-width: 575.98px) {
    .clu-page-title {
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    .clu-page-actions {
        flex: 0 1 auto;
        justify-content: flex-start;
    }
}

/* Filter rows (letter bars, status, tag and publisher pills). On a phone they
   keep to one line and scroll sideways, as /collection's letter bar does,
   instead of wrapping into a block that pushes the results down a screen.
   clu-page.js fades whichever edge has more to scroll to and keeps the active
   choice in view. Wider screens wrap as before, unless the row also carries
   .clu-filter-scroll-always (App Settings' tabs, which overflow a tablet). */
@media (max-width: 767.98px) {
    .clu-filter-scroll {
        flex-wrap: nowrap !important;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        /* Room for the focus ring, which the overflow would clip. */
        padding: 0.25rem;
        margin: -0.25rem;
    }

    .clu-filter-scroll > * {
        flex-shrink: 0;
        white-space: nowrap;
    }
}

.clu-filter-scroll-always {
    flex-wrap: nowrap !important;
    overflow-x: auto;
    overflow-y: hidden;
}

.clu-filter-scroll-always > * {
    flex-shrink: 0;
    white-space: nowrap;
}

/* The rest needs no breakpoint: a row that wraps is not a scroll container
   and clu-page.js marks an edge only when the row really overflows, so these
   do nothing until one of the rules above makes the row scroll. */
.clu-filter-scroll {
    --clu-filter-fade: 2rem;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    /* Focus scrolling and the active-choice reveal stop clear of the fade. */
    scroll-padding-inline: var(--clu-filter-fade);
}

.clu-filter-scroll::-webkit-scrollbar {
    display: none;
}

.clu-filter-scroll[data-more-end] {
    -webkit-mask-image: linear-gradient(to right, #000 calc(100% - var(--clu-filter-fade)), transparent);
    mask-image: linear-gradient(to right, #000 calc(100% - var(--clu-filter-fade)), transparent);
}

.clu-filter-scroll[data-more-start] {
    -webkit-mask-image: linear-gradient(to right, transparent, #000 var(--clu-filter-fade));
    mask-image: linear-gradient(to right, transparent, #000 var(--clu-filter-fade));
}

.clu-filter-scroll[data-more-start][data-more-end] {
    -webkit-mask-image: linear-gradient(to right, transparent, #000 var(--clu-filter-fade), #000 calc(100% - var(--clu-filter-fade)), transparent);
    mask-image: linear-gradient(to right, transparent, #000 var(--clu-filter-fade), #000 calc(100% - var(--clu-filter-fade)), transparent);
}

/* ---- Filters, search and pagers (partials/filters.html, clu-filters.js) ----
   One look for every list toolbar. Buttons are Bootstrap's
   btn-outline-secondary btn-sm with .active for the selection; these rules
   only lay them out. */
.clu-filter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

.clu-filter-label {
    flex: 0 0 auto;
    font-size: 0.875rem;
    color: var(--bs-body-color);
    white-space: nowrap;
}

.clu-filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    min-width: 0;
}

/* A count inside a filter button: a tint of the button's own text colour, so
   it reads on the outline and on the filled (.active) state, on every theme. */
.clu-filter-count {
    display: inline-block;
    margin-left: 0.375rem;
    padding: 0 0.4em;
    border-radius: var(--bs-border-radius-pill);
    background: color-mix(in srgb, currentColor 16%, transparent);
    font-size: 0.75em;
    font-weight: 600;
    line-height: 1.5;
    font-variant-numeric: tabular-nums;
}

/* Letter bars are one joined group. They wrap onto another row on wider
   screens; on a phone .clu-filter-scroll keeps them to one line and scrolls.
   The row gap keeps a wrapped row's borders off the row above it. */
.clu-letter-bar {
    flex-wrap: wrap;
    row-gap: 0.25rem;
}

.clu-letter-bar > .btn {
    flex: 0 0 auto;
    min-width: 2rem;
}

.clu-search {
    width: 100%;
    max-width: 22rem;
}

.clu-search .input-group-text {
    color: var(--bs-secondary-color);
}

/* Every page bar: page numbers keep their width while the window moves. */
.pagination .page-link {
    font-variant-numeric: tabular-nums;
}

/* Touch screens: 44px targets on every pager, not only /collection's. */
@media (pointer: coarse) {
    .pagination .page-link {
        min-width: 2.75rem;
        min-height: 2.75rem;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* ---- The list toolbar (toolbar() in partials/filters.html) ----------------
   Every list's controls sit in one flat panel on the theme's raised surface:
   search and selects first, the result count, view toggle and page size
   pushed right, then one row per filter, then the letter bar. */
.clu-toolbar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background-color: var(--bs-tertiary-bg);
    border-radius: var(--bs-border-radius-lg);
}

.clu-toolbar-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

/* Rows are display:flex, which beats the bare [hidden] rule. */
.clu-toolbar-row[hidden] {
    display: none !important;
}

.clu-toolbar-row > .clu-search {
    flex: 1 1 14rem;
}

.clu-toolbar-end {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    margin-left: auto;
}

.clu-toolbar-count {
    color: var(--bs-secondary-color);
    font-size: 0.875rem;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

/* A label sits on the first line of buttons when the buttons wrap: its line
   box is a btn-sm's height (font 0.875rem x 1.5, 0.25rem padding, 1px border). */
.clu-toolbar .clu-filter {
    align-items: flex-start;
}

.clu-toolbar .clu-filter-label {
    line-height: calc(1.3125rem + 0.5rem + 2px);
}

/* Stacked filter rows start their buttons in one column. */
@media (min-width: 768px) {
    .clu-toolbar .clu-filter-label {
        min-width: 5.5rem;
    }
}

@media (max-width: 575.98px) {
    .clu-toolbar {
        padding: 0.75rem;
    }

    .clu-toolbar-row > .clu-search {
        flex-basis: 100%;
        max-width: none;
    }

    /* The end group takes its own line: the count on the left, the
       controls packed together after it. */
    .clu-toolbar-end {
        width: 100%;
        margin-left: 0;
    }

    .clu-toolbar-end > .clu-toolbar-count {
        margin-right: auto;
    }
}

/* A labelled select (select_field, per_page_select): the label sits inside
   the control on the page background, so the pair reads as one field on the
   toolbar's raised surface. As wide as its longest option: it never stretches
   across a row, and never shrinks until "240" reads "2". The borderless
   control keeps a visible focus ring on the group. */
.clu-select {
    width: auto;
    flex: 0 0 auto;
    border-radius: var(--bs-border-radius-sm);
}

.clu-select > .input-group-text,
.clu-select > .form-select {
    border: 0;
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.clu-select > .input-group-text {
    color: var(--bs-secondary-color);
}

.clu-select > .form-select {
    width: auto;
    min-width: 5rem;
    max-width: 16rem;
    flex: 0 0 auto;
    box-shadow: none;
}

.clu-select:focus-within {
    outline: 2px solid var(--bs-focus-ring-color, var(--bs-primary));
    outline-offset: 1px;
}