/* ==========================================================================
   SLIDER INSTITUCIONAL (v10) - IESTP Carlos Salazar Romero

   [FIX-14] Versión limpia y definitiva: elimina reglas acumuladas de
            versiones anteriores (aspect-ratio, position relative) que
            ocultaban la imagen en móvil.
   - Alto fijo por variable (--csr-slider-height).
   - Escritorio: object-fit: cover (llena todo).
   - Móvil (en responsive.css): object-fit: contain (imagen completa) +
     fondo desenfocado con la misma foto (::before + --csr-slide-img).

   Convención: prefijo csr- | Metodología BEM
   NOTA: los media queries están en responsive.css (bloque v10)
   ========================================================================== */

/* ==========================================================================
   1. CONTENEDOR — ALTO FIJO
   ========================================================================== */
.csr-slider {
    --csr-slider-height: 720px;   /* alto de escritorio */
    position: relative;
    width: 100%;
    height: var(--csr-slider-height);
    overflow: hidden;
    background-color: var(--csr-color-primary-dark);
    outline: none;
}

/* ==========================================================================
   2. PISTA Y DIAPOSITIVAS
   ========================================================================== */
.csr-slider__track {
    display: flex;
    height: 100%;
    transition: transform 0.65s cubic-bezier(0.65, 0, 0.35, 1);
    will-change: transform;
}

.csr-slider__slide {
    position: relative;
    flex: 0 0 100%;
    height: 100%;
    overflow: hidden;
}

/* ==========================================================================
   3. IMAGEN + FONDO DESENFOCADO
   ========================================================================== */

/* .csr-slider__media: capa absoluta que llena la diapositiva */
.csr-slider__media {
    position: absolute;
    inset: 0;
    z-index: 0;
    /* Respaldo si la foto no carga */
    background: linear-gradient(135deg,
        var(--csr-color-primary-dark) 0%,
        var(--csr-color-primary) 55%,
        var(--csr-color-secondary) 100%);
}

/* Fondo desenfocado con la MISMA foto (rellena franjas en móvil;
   en escritorio queda oculto detrás de la imagen cover) */
.csr-slider__media::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--csr-slide-img, none);
    background-size: cover;
    background-position: center;
    filter: blur(24px) brightness(0.55) saturate(1.1);
    transform: scale(1.15);   /* oculta el borde difuminado */
}

/* Imagen principal */
.csr-slider__media img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;          /* escritorio: llena sin distorsionar */
    object-position: center;
    display: block;
    z-index: 1;
}

/* Si la imagen no carga, se oculta y queda el degradado/fondo blur */
.csr-slider__media img.csr-slider__img--error {
    opacity: 0;
}

/* ---------- Capa oscura solo en la zona inferior (texto legible) ---------- */
.csr-slider__overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: linear-gradient(to top,
        rgba(0, 29, 58, 0.85) 0%,
        rgba(0, 29, 58, 0.35) 32%,
        rgba(0, 29, 58, 0) 60%);
}

/* ==========================================================================
   4. CONTENIDO DE TEXTO (BICOLOR)
   ========================================================================== */
.csr-slider__content {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3;
    padding: 2.5rem clamp(1.5rem, 6vw, 5rem) 4.6rem;
    color: var(--csr-color-white);
}

.csr-slider__tag {
    display: inline-block;
    background-color: var(--csr-color-tertiary);
    color: var(--csr-color-dark);
    padding: 0.4rem 1.1rem;
    border-radius: var(--csr-radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.9rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
}

.csr-slider__title {
    color: var(--csr-color-white);
    font-size: clamp(1.5rem, 3.6vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    max-width: 760px;
    margin-bottom: 0.8rem;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

/* Segundo color del texto = TERCIARIO (#ffee00) */
.csr-slider__highlight {
    color: var(--csr-color-tertiary);
}

.csr-slider__text {
    color: rgba(255, 255, 255, 0.92);
    font-size: clamp(0.92rem, 1.4vw, 1.1rem);
    line-height: 1.65;
    max-width: 640px;
    margin-bottom: 1.3rem;
}

.csr-slider__text strong {
    color: var(--csr-color-tertiary);
}

.csr-slider__btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--csr-color-secondary), var(--csr-color-secondary-dark));
    color: var(--csr-color-white);
    padding: 0.7rem 1.6rem;
    border-radius: var(--csr-radius-xl, 20px);
    font-weight: 600;
    font-size: 0.92rem;
    text-decoration: none;
    box-shadow: 0 6px 20px rgba(227, 0, 15, 0.35);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.csr-slider__btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(227, 0, 15, 0.5);
    color: var(--csr-color-white);
}

/* ---------- Animación de entrada escalonada del texto ---------- */
.csr-slider__content > * {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.csr-slider__slide--active .csr-slider__content > * {
    opacity: 1;
    transform: translateY(0);
}

.csr-slider__slide--active .csr-slider__tag   { transition-delay: 0.2s; }
.csr-slider__slide--active .csr-slider__title { transition-delay: 0.35s; }
.csr-slider__slide--active .csr-slider__text  { transition-delay: 0.5s; }
.csr-slider__slide--active .csr-slider__btn   { transition-delay: 0.65s; }

/* ==========================================================================
   5. FLECHAS LATERALES — DIBUJADAS CON CSS
   ========================================================================== */
.csr-slider__arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 4;
    width: 50px;
    height: 50px;
    border-radius: var(--csr-radius-full);
    background-color: rgba(0, 61, 122, 0.55);
    backdrop-filter: blur(3px);
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.csr-slider__arrow::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 13px;
    height: 13px;
    border-right: 3px solid var(--csr-color-white);
    border-bottom: 3px solid var(--csr-color-white);
    transition: border-color 0.3s ease;
}

.csr-slider__arrow--prev { left: 1rem; }
.csr-slider__arrow--prev::after { transform: translate(-35%, -50%) rotate(135deg); }

.csr-slider__arrow--next { right: 1rem; }
.csr-slider__arrow--next::after { transform: translate(-65%, -50%) rotate(315deg); }

.csr-slider__arrow:hover {
    background-color: var(--csr-color-tertiary);
    transform: translateY(-50%) scale(1.08);
}

.csr-slider__arrow:hover::after {
    border-color: var(--csr-color-dark);
}

/* ==========================================================================
   6. INDICADORES (DOTS)
   ========================================================================== */
.csr-slider__dots {
    position: absolute;
    bottom: 1.2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    display: flex;
    gap: 0.5rem;
}

.csr-slider__dot {
    width: 12px;
    height: 12px;
    border-radius: var(--csr-radius-full);
    background-color: rgba(255, 255, 255, 0.45);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: all 0.3s ease;
}

.csr-slider__dot:hover { background-color: rgba(255, 255, 255, 0.8); }

.csr-slider__dot--active {
    width: 34px;
    background-color: var(--csr-color-tertiary);
}