/* ==========================================================================
   Indexing Page Manager — frontend-grid.css
   The responsive logo grid + index tiles.

   Each card is a fixed light tile so logos (often dark-on-transparent) stay
   legible in light AND dark mode. Because the tile background is always light,
   the captions on it use an explicit dark colour rather than inheriting the
   theme text — otherwise, in a theme's dark mode the inherited text turns light
   and disappears on the white tile. Column count is admin-controlled via the
   --ipm-cols custom property; mobile clamps to 2 (<640px) then 1 (<420px).
   ========================================================================== */

.ipm-grid {
    display: grid;
    grid-template-columns: repeat(var(--ipm-cols, 4), minmax(0, 1fr));
    gap: 1rem;
    align-items: stretch;
}

.ipm-card {
    display: flex;
    border: 1px solid rgba(0, 0, 0, .08);
    border-radius: 10px;
    background: #fff;
    overflow: hidden;
    transition: box-shadow .18s ease, transform .18s ease, border-color .18s ease;
}
.ipm-card:hover { border-color: rgba(0, 0, 0, .14); box-shadow: 0 6px 18px rgba(0, 0, 0, .07); transform: translateY(-2px); }

/* Keyboard focus must be at least as obvious as the hover state (WCAG 2.4.7).
   The card link carries no text decoration, and `.ipm-card` sets
   `overflow: hidden` — which would clip an outline drawn on the inner <a> — so
   the focus ring is drawn on the CARD itself via :focus-within (an element's
   own outline is not clipped by its own overflow). The ring uses an explicit
   high-contrast colour because the tile is a fixed light surface on every
   theme, incl. dark mode. :focus-visible keeps the ring keyboard-only; the
   plain :focus rule is the fallback for engines without :focus-visible. */
.ipm-card:focus-within {
    border-color: rgba(0, 0, 0, .14);
    box-shadow: 0 6px 18px rgba(0, 0, 0, .07);
    transform: translateY(-2px);
    outline: 3px solid var(--ipm-accent, #1e3a8a);
    outline-offset: 2px;
}
.ipm-card:has(.ipm-card-link:focus:not(:focus-visible)) { outline: none; }
@media (prefers-contrast: more), (forced-colors: active) {
    .ipm-card:focus-within { outline-width: 4px; }
}

.ipm-card-link {
    display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
    gap: .6rem; width: 100%; padding: 1.25rem 1rem;
    text-decoration: none; color: #1f2937;
}
/* Fallback for engines without :has(): the card-level ring above can't be
   suppressed for mouse focus there, so instead skip it on the card and draw an
   inset ring on the link itself (inset so `.ipm-card`'s overflow:hidden can't
   clip it). Engines WITH :has() ignore this block, avoiding a doubled ring. */
@supports not (selector(:has(*))) {
    .ipm-card:focus-within { outline: none; }
    .ipm-card-link:focus-visible { outline: 3px solid var(--ipm-accent, #1e3a8a); outline-offset: -3px; }
}
.ipm-card-link--static { cursor: default; }

.ipm-card-logo { display: flex; align-items: center; justify-content: center; width: 100%; height: 64px; }
/* Logos render in their own colours; the card's hover shadow/lift is the only
   effect (no grayscale). */
.ipm-card-logo-img {
    max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain;
}

.ipm-card-logo-fallback {
    display: flex; align-items: center; justify-content: center; text-align: center;
    width: 100%; height: 100%; padding: 0 .4rem; box-sizing: border-box;
    font-size: .95rem; font-weight: 600; color: #374151; line-height: 1.2;
}

/* Captions use explicit colours readable on the fixed light tile in any theme /
   mode (see header note). */
.ipm-card-name { font-size: .9rem; font-weight: 600; text-align: center; line-height: 1.3; color: #1f2937; }
.ipm-card-desc { font-size: .78rem; text-align: center; line-height: 1.45; color: #4b5563; }

/* Logo-only grid can breathe a touch more. */
.ipm-grid--logos .ipm-card-link { padding: 1.4rem 1rem; }
.ipm-grid--logos .ipm-card-logo { height: 58px; }

@media (max-width: 640px) { .ipm-grid { --ipm-cols: 2 !important; gap: .75rem; } }
@media (max-width: 420px) { .ipm-grid { --ipm-cols: 1 !important; } }