/*********************
  @Componente: edu-skeleton
  Placeholder de carga con animacion shimmer.
  Reemplaza contenido mientras se cargan datos via AJAX.
**********************/

/* --- #Variables --- */
:root {
    --edu-skeleton-bg: #ffffff;
    --edu-skeleton-color-base: #e8e8e8;
    --edu-skeleton-color-mid: #dcdcdc;
    --edu-skeleton-color-dark: #d2d2d2;
    --edu-skeleton-shimmer: rgba(0, 0, 0, .08);
    --edu-skeleton-duration: .8s;
    --edu-skeleton-radius: 3px;
}

/* --- #Container --- */
.edu-skeleton {
    position: relative;
    background-color: var(--edu-skeleton-bg);
    border-radius: 4px;
    overflow: hidden;
}

.edu-skeleton::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg, transparent, transparent, transparent,
        var(--edu-skeleton-shimmer),
        transparent, transparent, transparent
    );
    transform: translateX(-100%);
    animation: edu-skeleton-shimmer var(--edu-skeleton-duration) infinite;
}

/* --- #SVG placeholder --- */
.edu-skeleton svg {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
}

/* --- #Variant: cards (lista de tarjetas tipo anuncio) --- */
.edu-skeleton-cards {
    padding: 0;
    background-color: transparent;
}

/* El shimmer vive en cada tarjeta, no en el wrapper: asi
   el gap entre tarjetas queda transparente (se ve el fondo
   de la pagina) y el efecto shimmer se limita a cada card. */
.edu-skeleton-cards::after {
    display: none;
}

.edu-skeleton-cards .edu-skeleton-card {
    position: relative;
    overflow: hidden;
    margin-bottom: 20px;
    padding: 16px 20px;
    border: 1px solid #eeeeee;
    border-radius: 6px;
    background: #ffffff;
}

.edu-skeleton-cards .edu-skeleton-card::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg, transparent, transparent, transparent,
        var(--edu-skeleton-shimmer),
        transparent, transparent, transparent
    );
    transform: translateX(-100%);
    animation: edu-skeleton-shimmer var(--edu-skeleton-duration) infinite;
}

.edu-skeleton-cards .edu-skeleton-card:last-child {
    margin-bottom: 0;
}

.edu-skeleton-cards .edu-skeleton-card-head {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.edu-skeleton-cards .edu-skeleton-avatar {
    flex: 0 0 28px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-cards .edu-skeleton-name {
    width: 180px;
    height: 10px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-cards .edu-skeleton-date {
    width: 90px;
    height: 10px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-mid);
}

.edu-skeleton-cards .edu-skeleton-card-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 8px 0 14px;
}

.edu-skeleton-cards .edu-skeleton-line {
    height: 10px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-cards .edu-skeleton-card-foot {
    width: 120px;
    height: 9px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-mid);
}

/* --- #Variant: rows (lista de filas tipo historial wiki) --- */
.edu-skeleton-rows {
    padding: 12px 0;
}

.edu-skeleton-rows .edu-skeleton-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 0;
    border-bottom: 1px dotted #e5e5e5;
}

.edu-skeleton-rows .edu-skeleton-row:last-child {
    border-bottom: none;
}

.edu-skeleton-rows .edu-skeleton-bar {
    height: 9px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-rows .edu-skeleton-bar-mid {
    background: var(--edu-skeleton-color-mid);
}

/* --- #Variant: grid (grilla de tarjetas tipo planes/aulas) --- */
.edu-skeleton-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 0;
    background: transparent;
}

/* El shimmer vive en cada card, no en el wrapper, igual que en .edu-skeleton-cards. */
.edu-skeleton-grid::after { display: none; }

.edu-skeleton-grid .edu-skeleton-grid-card {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .08);
}

.edu-skeleton-grid .edu-skeleton-grid-card::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg, transparent, transparent, transparent,
        var(--edu-skeleton-shimmer),
        transparent, transparent, transparent
    );
    transform: translateX(-100%);
    animation: edu-skeleton-shimmer var(--edu-skeleton-duration) infinite;
}

.edu-skeleton-grid .edu-skeleton-grid-banner {
    width: 100%;
    height: 130px;
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-grid .edu-skeleton-grid-title {
    width: 70%;
    height: 14px;
    margin: 16px 16px 8px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-base);
}

.edu-skeleton-grid .edu-skeleton-grid-line {
    height: 10px;
    margin: 0 16px 16px;
    border-radius: var(--edu-skeleton-radius);
    background: var(--edu-skeleton-color-mid);
}

.edu-skeleton-grid .edu-skeleton-grid-footer {
    height: 36px;
    margin-top: 14px;
    background: var(--edu-skeleton-color-mid);
}

@media (max-width: 1024px) {
    .edu-skeleton-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .edu-skeleton-grid { grid-template-columns: 1fr; }
}

/* --- #Keyframes --- */
@keyframes edu-skeleton-shimmer {
    100% { transform: translateX(100%); }
}