/* portfolio.css */

/* ---- FOND FIXE ---- */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url('../photo/divers/IMG_2066 2.JPG');
    background-size: cover;
    background-position: center;
    opacity: 0.1;
    z-index: -1;
    pointer-events: none;
}

.portfolio-header p {
    font-size: 15px;
    color: var(--stone);
    letter-spacing: 0.04em;
}

/* ---- FILTRES ---- */
.portfolio-filters {
    display: flex;
    gap: 8px;
    padding: 30px 40px;
    background: var(--white);
    border-bottom: 1px solid var(--beige);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.filter-btn {
    font-family: var(--font-body);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 8px 20px;
    border: 1px solid var(--beige);
    background: none;
    color: var(--stone);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}
.filter-btn:hover,
.filter-btn.active {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--white);
}

/* ---- GRILLE MASONRY ---- */
.portfolio-grid {
    display: flex;
    gap: 5px;
    padding: 5px;
    background: var(--warm-bg);
    align-items: flex-start;
}
.portfolio-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.portfolio-item {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    display: block;
    width: 100%;

    /* état initial pour l'animation */
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
.portfolio-item.visible {
    opacity: 1;
    transform: translateY(0);
}
.portfolio-col:nth-child(1) .portfolio-item { transition-delay: 0s; }
.portfolio-col:nth-child(2) .portfolio-item { transition-delay: 0.12s; }
.portfolio-col:nth-child(3) .portfolio-item { transition-delay: 0.24s; }

.portfolio-img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.9s cubic-bezier(0.4, 0, 0.2, 1), filter 0.5s;
    filter: brightness(0.92) saturate(0.85);
}
.portfolio-item:hover .portfolio-img {
    transform: scale(1.04);
    filter: brightness(0.7) saturate(1.1);
}

/* Ligne décorative animée */
.portfolio-item::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0; height: 2px;
    background: var(--white);
    z-index: 2;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.portfolio-item:hover::before {
    width: 100%;
}

.portfolio-caption {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: 28px 24px 24px;
    background: linear-gradient(to top, rgba(28,26,24,0.85) 0%, rgba(28,26,24,0.3) 60%, transparent 100%);
    transform: translateY(10px);
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}
.portfolio-item:hover .portfolio-caption {
    opacity: 1;
    transform: translateY(0);
}
.portfolio-caption span {
    font-family: var(--font-display);
    font-size: 20px;
    color: var(--white);
    font-style: italic;
    letter-spacing: 0.02em;
}
.portfolio-caption small {
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.55);
    padding-bottom: 2px;
    transition: opacity 0.3s ease;
}

.portfolio-item:hover .portfolio-caption small {
    opacity: 0;
}

/* ---- CTA bas de page ---- */
.portfolio-cta {
    padding: 80px 40px;
    text-align: center;
    background: var(--cream);
}
.portfolio-cta p {
    font-family: var(--font-display);
    font-size: 26px;
    font-style: italic;
    color: var(--charcoal);
    margin-bottom: 28px;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
    .portfolio-grid {
        flex-wrap: wrap;
        gap: 4px;
        padding: 4px;
    }
    .portfolio-col { flex: 0 0 calc(50% - 2px); }
    .portfolio-col:nth-child(3) {
        flex: 0 0 100%;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 4px;
    }
    .portfolio-col:nth-child(3) .portfolio-item { flex: 0 0 calc(50% - 2px); }
    .portfolio-cta { padding: 60px 24px; }
    .portfolio-cta p { font-size: 22px; }
}

@media (max-width: 480px) {
    .portfolio-grid {
        flex-direction: column;
        gap: 3px;
        padding: 3px;
    }
    .portfolio-col {
        flex: 1 1 100%;
        flex-direction: column;
    }
    .portfolio-col:nth-child(3) {
        flex: 0 0 100%;
        flex-direction: column;
    }
    .portfolio-col:nth-child(3) .portfolio-item {
        flex: 1 1 100%;
    }
    .portfolio-item .portfolio-caption span {
        font-size: 13px;
    }
    .portfolio-cta { padding: 48px 20px; }
    .portfolio-cta p { font-size: 20px; }
}