/* =========================
   Titres & filtres
   ========================= */
.title{
    text-align:center;
    letter-spacing:.06em;
    font-weight:700;
    font-size:1.8rem;
    margin-bottom:1.25rem;
    color: #193A63;
}

.filter-btn {
    color: #193A63;
}

.filters{
    display:flex;
    gap:.75rem;
    justify-content:center;
    flex-wrap:wrap;
    margin:1.5rem 0 2rem;
}

.filter-btn{
    border: 2px solid transparent;
    background: #f5f7fa;
    padding: .65rem 1.2rem;
    font-weight: 600;
    letter-spacing: .03em;
    cursor: pointer;
    border-radius: 999px;
    transition: all .3s ease;
    color: #193A63;
}

.filter-btn:hover{
    background: #e8ecf1;
    transform: translateY(-2px);
}

.filter-btn:active{
    transform: scale(.98);
}

.filter-btn.active{
    background: #193A63;
    color: #fff;
    border-color: #193A63;
    box-shadow: 0 4px 12px rgba(25, 58, 99, 0.3);
}

/* =========================
   Grille (desktop par défaut)
   ========================= */
.grid{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* =========================
   Cartes images
   ========================= */
.card{
    position: relative;
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .1);
    transition: transform .3s ease, box-shadow .3s ease;
    cursor: pointer;
}

.card:hover{
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .18);
}

.card img{
    width: 100%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    display: block;
    transition: transform .4s ease;
}

.card:hover img{
    transform: scale(1.05);
}

/* Légende overlay - améliorée */
.card .caption{
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 1rem 1rem;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: .04em;
    color: #fff;
    text-align: center;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, .75) 100%);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* États utilitaires */
.hidden{
    display: none !important;
}

.empty{
    text-align: center;
    opacity: .7;
    padding: 3rem 0;
    font-size: 1.1rem;
    color: #666;
}

/* =========================
   Lightbox (viewer plein écran) - améliorée
   ========================= */
.lightbox{
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .92);
    display: grid;
    place-items: center;
    z-index: 9999;
    padding: 32px;
    backdrop-filter: blur(4px);
}

.lightbox.hidden{
    display: none;
}

.lb-content{
    max-width: min(95vw, 1400px);
    max-height: 90vh;
    margin: 0;
    display: grid;
    gap: 16px;
    color: #fff;
    text-align: center;
}

#lb-image{
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    width: auto;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, .5);
}

#lb-caption{
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: .04em;
    word-break: break-word;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* Boutons overlay - améliorés */
.lb-close, .lb-prev, .lb-next{
    position: absolute;
    border: none;
    background: rgba(255, 255, 255, .2);
    color: #fff;
    font-size: 32px;
    line-height: 1;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: all .3s ease;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.lb-close{
    top: 24px;
    right: 24px;
    font-size: 36px;
}

.lb-prev {
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.lb-next {
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.lb-close:hover,
.lb-prev:hover,
.lb-next:hover{
    background: rgba(255, 255, 255, .35);
    transform: translateY(-50%) scale(1.1);
}

.lb-close:hover {
    transform: scale(1.1);
}

.lb-prev:active, .lb-next:active, .lb-close:active{
    transform: scale(.94);
}

/* =========================
   Responsive
   ========================= */

/* Tablette */
@media (max-width: 992px){
    .grid{
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    .card img{
        aspect-ratio: 3 / 4;
    }
}

/* Téléphone */
@media (max-width: 600px){
    .grid{
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card{
        border-radius: 12px;
    }

    .card img{
        aspect-ratio: 4 / 5;
    }

    .card .caption{
        font-size: .9rem;
        padding: .75rem .6rem;
    }

    /* filtres scrollables horizontalement */
    .filters{
        justify-content: flex-start;
        overflow-x: auto;
        gap: .5rem;
        padding: 0 1rem;
        margin: 1rem 0 1.5rem;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
    }

    .filter-btn{
        flex: 0 0 auto;
        scroll-snap-align: start;
        padding: .6rem .9rem;
        font-size: .9rem;
    }

    /* Lightbox boutons */
    #lb-image{
        max-height: 70vh;
        border-radius: 8px;
    }

    .lb-close, .lb-prev, .lb-next{
        width: 48px;
        height: 48px;
        font-size: 28px;
    }

    .lb-close {
        top: 16px;
        right: 16px;
    }

    .lb-prev {
        left: 16px;
    }

    .lb-next {
        right: 16px;
    }
}