/* Contenitore portfolio */
.portfolio {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    border-radius: 8px;
}

/* Immagine */
.portfolio img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    position: relative;
    z-index: 1; /* sotto overlay */
}

/* Overlay scuro */
.portfolio .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.55);
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 2; /* sopra immagine, sotto titolo e bottone */
    border-radius: 8px;
}

.portfolio:hover .overlay {
    opacity: 1;
}

/* Titolo SEMPRE visibile sopra overlay */
.portfolio .overlay-title {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 22px;
    font-weight: bold;
    opacity: 1;
    z-index: 4; /* sopra overlay e sopra bottone */
    text-align: center;
    pointer-events: none;
}

/* Bottone */
.portfolio .overlay-btn {
    position: absolute;
    left: 50%;
    bottom: 25px;
    transform: translateX(-50%);
    padding: 10px 22px;
    background: #ff6600;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    opacity: 0;
    z-index: 3; /* sotto titolo, sopra overlay */
    transition: opacity 0.3s ease;
}

/* Bottone visibile solo in hover */
.portfolio:hover .overlay-btn {
    opacity: 1;
}

/* Sfondo blur dietro al titolo */
.portfolio .overlay-title::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 110%;
    height: 140%;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(6px);
    border-radius: 8px;
    z-index: -1; /* resta dietro al testo */
    transition: opacity 0.3s ease;
    opacity: 1; /* visibile di default */
}

/* Quando parte l’overlay scuro, il blur sparisce */
.portfolio:hover .overlay-title::before {
    opacity: 0;
}


/* Effetti hover */
.portfolio:hover {
    border-radius: 12; /* diventa quadrato */
}

.portfolio:hover img {
    transform: scale(1.05);
    border-radius: 12; /* diventa quadrato */
}

.portfolio:hover .overlay {
    opacity: 1;
    border-radius: 12; /* diventa quadrato */
}

.portfolio:hover .overlay-title {
    opacity: 1;
}

.portfolio:hover .overlay-btn {
    opacity: 1;
    transform: translateX(-50%) translateY(-5px);
}