/* ============================================================
   KOBALTO ACADEMY · "El alumno en el centro" — Slider 16 cards
   Patrón visual de www.kobalto.es ("Contenido a la carta")
   adaptado para mostrar cabecera + capturas (1, 2 o 3 por slide).
   - Caja exterior blanca con cabecera coloreada por slide
   - Sección de imágenes en negro corporativo #0d0d1a
   - Nav inferior con flechas circulares + contador 1 / N
   ============================================================ */

.alumno-slider-wrapper {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.alumno-slider {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    background: var(--blanco, #fff);
    border: 1px solid rgba(4, 36, 84, 0.10);
    box-shadow: 0 14px 50px rgba(4, 36, 84, 0.12);
    margin-bottom: 1.25rem;
}

/* Slides — fade transition (Pattern A de kobalto.es) */
.alumno-slide {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease;
}

.alumno-slide.active {
    position: relative;
    opacity: 1;
    pointer-events: auto;
}

/* Cabecera coloreada — sobre fondo blanco, tintada según slide */
.alumno-slide-header {
    padding: 1.4rem 1.5rem 1.2rem;
    text-align: center;
    color: var(--azul-corporativo, #042454);
    background: var(--blanco, #fff);
}

.alumno-slide-header h4 {
    font-family: 'Josefin Sans', sans-serif;
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin: 0 0 0.35rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.alumno-slide-header h4 i {
    font-size: 1.1em;
}

.alumno-slide-header p {
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.45;
    color: var(--azul-corporativo, #042454);
    opacity: 0.78;
}

/* Variantes de color (5 en rotación, alineadas con plataforma-cards.css) */
.alumno-slide-header.color-turquesa        { background: rgba(29, 211, 176, 0.16); }
.alumno-slide-header.color-turquesa h4     { color: #15a085; }

.alumno-slide-header.color-azul-brillante  { background: rgba(27, 111, 176, 0.16); }
.alumno-slide-header.color-azul-brillante h4 { color: var(--azul-brillante, #1B6FB0); }

.alumno-slide-header.color-dorado          { background: rgba(255, 199, 0, 0.22); }
.alumno-slide-header.color-dorado h4       { color: var(--azul-corporativo, #042454); }
.alumno-slide-header.color-dorado h4 i     { color: #c79c00; }

.alumno-slide-header.color-azul-medio      { background: rgba(64, 80, 134, 0.14); }
.alumno-slide-header.color-azul-medio h4   { color: var(--azul-medio, #5a6a8a); }

.alumno-slide-header.color-morado          { background: rgba(168, 85, 247, 0.14); }
.alumno-slide-header.color-morado h4       { color: var(--morado, #4f0093); }

/* Imágenes — caja oscura corporativa (firma visual de kobalto.es) */
.alumno-slide-images {
    display: grid;
    gap: 0.5rem;
    padding: 0.85rem;
    background: #0d0d1a;
}

.alumno-slide-images.images-1 { grid-template-columns: 1fr; }
.alumno-slide-images.images-2 { grid-template-columns: 1fr 1fr; }
.alumno-slide-images.images-3 { grid-template-columns: 1fr 1fr 1fr; }

.alumno-slide-images picture {
    display: block;
    width: 100%;
    overflow: hidden;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    aspect-ratio: 16 / 9;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.alumno-slide-images img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

/* Barra de navegación — flechas circulares + contador 1/N (sobre fondo oscuro) */
.alumno-slider-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.1rem;
    padding: 0.95rem 0.75rem;
    background: #0d0d1a;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.alumno-slider-arrow {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #fff;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: background 0.25s, transform 0.25s, border-color 0.25s;
}

.alumno-slider-arrow:hover,
.alumno-slider-arrow:focus-visible {
    background: rgba(255, 199, 0, 0.28);
    border-color: rgba(255, 199, 0, 0.5);
    transform: scale(1.06);
    outline: none;
}

.alumno-slider-arrow:active { transform: scale(0.96); }

.alumno-slider-count {
    color: rgba(255, 255, 255, 0.7);
    font-family: 'Josefin Sans', sans-serif;
    font-size: 1rem;
    letter-spacing: 0.08em;
    min-width: 75px;
    text-align: center;
    font-weight: 500;
}

/* Hint de deslizar — solo móvil */
.alumno-slider-hint {
    display: none;
}

@media (max-width: 768px) {
    .alumno-slider-hint {
        display: inline-flex;
        align-items: center;
        gap: 0.55rem;
        padding: 0.65rem 1.1rem;
        margin-top: 0.5rem;
        background: rgba(255, 199, 0, 0.18);
        border: 1px solid rgba(255, 199, 0, 0.35);
        border-radius: 50px;
        color: var(--azul-corporativo, #042454);
        font-size: 0.82rem;
        font-weight: 500;
        animation: alumnoHintPulse 2s ease-in-out infinite;
    }

    .alumno-slider-hint i {
        color: #c79c00;
    }

    .alumno-slider-hint.hidden {
        opacity: 0;
        transform: translateY(-6px);
        transition: opacity 0.4s ease, transform 0.4s ease;
        pointer-events: none;
    }
}

@keyframes alumnoHintPulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.6; }
}

/* Tablet (≤1024px) — 3 imágenes a 2 columnas con la 3ª expandida */
@media (max-width: 1024px) {
    .alumno-slider-wrapper { max-width: 760px; }
    .alumno-slide-header h4 { font-size: 1.18rem; }
    .alumno-slide-header p  { font-size: 0.88rem; }

    .alumno-slide-images.images-3 {
        grid-template-columns: 1fr 1fr;
    }
    .alumno-slide-images.images-3 picture:nth-child(3) {
        grid-column: 1 / -1;
    }
}

/* Móvil (≤640px) — todo a una sola columna */
@media (max-width: 640px) {
    .alumno-slider-wrapper { max-width: 100%; }
    .alumno-slider { border-radius: 14px; }
    .alumno-slide-header { padding: 1rem 1rem 0.85rem; }
    .alumno-slide-header h4 { font-size: 1.05rem; letter-spacing: 0.03em; }
    .alumno-slide-header p  { font-size: 0.82rem; line-height: 1.4; }

    .alumno-slide-images { gap: 0.4rem; padding: 0.55rem; }
    .alumno-slide-images.images-2,
    .alumno-slide-images.images-3 {
        grid-template-columns: 1fr;
    }
    .alumno-slide-images.images-3 picture:nth-child(3) {
        grid-column: auto;
    }

    .alumno-slider-nav    { padding: 0.85rem 0.6rem; gap: 0.85rem; }
    .alumno-slider-arrow  { width: 38px; height: 38px; font-size: 0.85rem; }
    .alumno-slider-count  { font-size: 0.85rem; min-width: 60px; letter-spacing: 0.06em; }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    .alumno-slide,
    .alumno-slider-arrow,
    .alumno-slider-hint { transition: none; animation: none; }
}