/* SkeletonStyles.css - Skeleton placeholder system */

/* Base skeleton */
.UnB-Skeleton {
    position: relative;
    overflow: hidden;
    background-color: var(--unb-skeleton-bg, rgba(255, 255, 255, 0.08));
    border-radius: var(--skeleton-radius, 0.25em);
    min-block-size: 1em;
    width: var(--skeleton-width, 100%);
    height: var(--skeleton-height, 1em);
    cursor: wait;
}

/* Pulse animation */
.UnB-Skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.05) 50%,
        transparent 100%
    );
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* Skeleton types */
.UnB-Skeleton--text {
    inline-size: var(--skeleton-width, 100%);
    block-size: var(--skeleton-height, 1em);
    border-radius: var(--skeleton-radius, 0.25em);
}

.UnB-Skeleton--title {
    inline-size: var(--skeleton-width, 60%);
    block-size: var(--skeleton-height, 1.5em);
    border-radius: var(--skeleton-radius, 0.25em);
}

.UnB-Skeleton--image {
    inline-size: var(--skeleton-width, 100%);
    block-size: var(--skeleton-height, auto);
    aspect-ratio: var(--skeleton-aspect, 16/9);
    border-radius: var(--skeleton-radius, 0.5em);
}

.UnB-Skeleton--button {
    inline-size: var(--skeleton-width, auto);
    min-inline-size: 5em;
    block-size: var(--skeleton-height, 2.5em);
    border-radius: var(--skeleton-radius, 0.5em);
}

.UnB-Skeleton--icon {
    inline-size: var(--skeleton-width, 1.5em);
    block-size: var(--skeleton-height, 1.5em);
    border-radius: var(--skeleton-radius, 50%);
}

.UnB-Skeleton--avatar {
    inline-size: var(--skeleton-width, 2.5em);
    block-size: var(--skeleton-height, 2.5em);
    border-radius: var(--skeleton-radius, 50%);
}

.UnB-Skeleton--input {
    inline-size: var(--skeleton-width, 100%);
    block-size: var(--skeleton-height, 2.5em);
    border-radius: var(--skeleton-radius, 0.25em);
}

.UnB-Skeleton--card {
    inline-size: var(--skeleton-width, 100%);
    block-size: var(--skeleton-height, 10em);
    border-radius: var(--skeleton-radius, 0.75em);
}

.UnB-Skeleton--thumbnail {
    inline-size: var(--skeleton-width, 4em);
    block-size: var(--skeleton-height, 4em);
    border-radius: var(--skeleton-radius, 0.25em);
}

.UnB-Skeleton--paragraph {
    inline-size: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5em;
}

.UnB-Skeleton--paragraph .line {
    inline-size: 100%;
    block-size: 1em;
    border-radius: 0.25em;
    background: var(--unb-skeleton-bg, rgba(255, 255, 255, 0.08));
}

.UnB-Skeleton--paragraph .line:nth-last-child(1) {
    inline-size: 75%;
}

/* Content ready state */
.UnB-Skeleton.content-ready {
    animation: skeleton-fade-in var(--unb-transition-duration, 300ms) ease-out forwards;
}

.UnB-Skeleton.content-error {
    animation: skeleton-fade-in var(--unb-transition-duration, 300ms) ease-out forwards;
    background-color: var(--unb-error-bg, rgba(255, 100, 100, 0.1));
}

@keyframes skeleton-fade-in {
    from {
        opacity: 0.3;
        transform: translateY(0.5em);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dismissed state */
.UnB-Alert--dismissed,
.UnB-Skeleton--dismissed {
    animation: skeleton-fade-out var(--unb-transition-duration, 300ms) ease-out forwards;
}

@keyframes skeleton-fade-out {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(0.5em);
    }
}

/* Transitions */
.UnB-Skeleton--transition-fade {
    transition: opacity var(--unb-transition-duration, 300ms) ease-out;
}

.UnB-Skeleton--transition-slide {
    transition: transform var(--unb-transition-duration, 300ms) ease-out,
                opacity var(--unb-transition-duration, 300ms) ease-out;
}

.UnB-Skeleton--transition-scale {
    transition: transform var(--unb-transition-duration, 300ms) ease-out,
                opacity var(--unb-transition-duration, 300ms) ease-out;
}

@media (prefers-reduced-motion: reduce) {
    .UnB-Skeleton::after {
        animation: none;
    }

    .UnB-Skeleton.content-ready,
    .UnB-Skeleton.content-error {
        animation: none;
        opacity: 1;
        transform: none;
    }
}