/*
 * <x-carousel-item>: one slide of an <x-carousel>, masked and shifted by the keyline maths
 * carousel.css's header describes, unless the row is full-screen or multi-aspect, where nothing
 * masks it at all (docs/reference/m3/components-actions-communication-containment.md § Carousel;
 * docs/audits/m3-alignment/containment.md, C-11, C-12, C-25).
 *
 *   [data-md-carousel-item]        the tab stop (C-18), a focusable `group`, `md-focus-ring`
 *     [data-md-carousel-surface]   the masked, shifted, extra-large-corner (28px) box
 *       [data-md-carousel-content] the slot (an <img>, cropped)
 *       [data-md-carousel-label]   the `label` prop's words, over a scrim gradient
 *         [data-md-carousel-label-text]
 *
 * The item renders the shared `md-focus-ring` class (foundation/interaction.css) rather than a
 * hand-rolled ring — the box the class draws *is* the item's own whole hit area — refined here to
 * an inset ring, 3px in, its own width (the old `focus-visible:-outline-offset-3`): items sit 8px
 * apart with the row clipping them, so the class's own 2px *outward* offset would be cut off at the
 * row's edges and crowd the next item.
 *
 * Full-screen: edge to edge, no corner, no mask — `--material-carousel-shift`/`-inset` go unread.
 * Multi-aspect: the view writes the item's own `aspect-ratio` inline (`aspect`, a prop, held
 * inside M3's 9:16–16:9 range); the extra-large corner still applies but nothing masks it, since
 * an Arrangement describes items of one size and a multi-aspect row has none. Selectors use `>`
 * throughout, matching carousel.css, so a carousel nested inside an item never inherits its
 * parent's layout rules.
 *
 * The label's ink is a literal `white`, not a role: it sits over `--md-sys-color-scrim`, which is
 * black in every scheme, theme and contrast level, so white is the one ink that always has the
 * scrim's contrast — a role (`inverse-on-surface`) is dark ink in a dark scheme and fails there
 * (C-25, deliberately kept, as the component's original header explained).
 */

@layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;

@layer material.components {
    [data-md-carousel-item] {
        position: relative;
        height: 100%;
        flex-shrink: 0;
        scroll-snap-align: start;
        scroll-snap-stop: always;
    }

    [data-md-carousel-item]:focus-visible {
        outline-offset: -3px;
    }

    [data-md-carousel='full-screen'] > [data-md-carousel-scroller] > [data-md-carousel-item] {
        width: 100%;
    }

    [data-md-carousel='multi-aspect'] > [data-md-carousel-scroller] > [data-md-carousel-item] {
        width: auto;
        border-radius: var(--md-sys-shape-corner-xl);
    }

    [data-md-carousel]:not([data-md-carousel='full-screen']):not([data-md-carousel='multi-aspect']) > [data-md-carousel-scroller] > [data-md-carousel-item] {
        width: var(--material-carousel-slot);
        max-width: 100%;
        border-radius: var(--md-sys-shape-corner-xl);
    }

    [data-md-carousel-item] > [data-md-carousel-surface] {
        position: relative;
        width: 100%;
        height: 100%;
        overflow: hidden;
        background-color: var(--md-sys-color-surface-container-highest);
        color: var(--md-sys-color-on-surface);
    }

    [data-md-carousel='multi-aspect'] > [data-md-carousel-scroller] > [data-md-carousel-item] > [data-md-carousel-surface] {
        border-radius: var(--md-sys-shape-corner-xl);
    }

    [data-md-carousel]:not([data-md-carousel='full-screen']):not([data-md-carousel='multi-aspect']) > [data-md-carousel-scroller] > [data-md-carousel-item] > [data-md-carousel-surface] {
        border-radius: var(--md-sys-shape-corner-xl);
        translate: var(--material-carousel-shift) 0;
        clip-path: inset(0 var(--material-carousel-inset, 0px) round var(--md-sys-shape-corner-xl));
    }

    [data-md-carousel-surface] > [data-md-carousel-content] {
        width: 100%;
        height: 100%;

        & > img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
    }

    [data-md-carousel-surface] > [data-md-carousel-label] {
        pointer-events: none;
        position: absolute;
        inset-inline: 0;
        bottom: 0;
        display: flex;
        padding: var(--md-sys-measurement-space500) var(--md-sys-measurement-space200) var(--md-sys-measurement-space200);
        background: linear-gradient(to top, color-mix(in srgb, var(--md-sys-color-scrim) 60%, transparent), transparent);
        opacity: var(--material-carousel-label);
    }

    [data-md-carousel-label] > [data-md-carousel-label-text] {
        overflow: hidden;
        color: white;
        font: var(--md-sys-typescale-title-md);
        letter-spacing: var(--md-sys-typescale-title-md-tracking);
        text-overflow: ellipsis;
        white-space: nowrap;
        translate: var(--material-carousel-label-shift) 0;
    }
}