/* ============================================
   SISTEMA EXPAND/COLLAPSE PER SEZIONI LUNGHE
   Riduce la prolissità mantenendo i contenuti
   ============================================ */

/* Contenitore sezione espandibile */
.expandable-section {
    position: relative;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Stato collassato - mostra solo prime righe */
.expandable-section.collapsed {
    max-height: 300px; /* Altezza iniziale visibile */
}

/* Stato espanso - mostra tutto */
.expandable-section.expanded {
    max-height: none;
}

/* Gradiente fade-out quando collassato */
.expandable-section.collapsed::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to bottom, transparent 0%, var(--bg-light, #ffffff) 100%);
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.expandable-section.expanded::after {
    opacity: 0;
}

/* Bottone espandi/collassa */
.expand-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem auto;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.expand-toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.expand-toggle-btn:active {
    transform: translateY(0);
}

/* Icona freccia nel bottone */
.expand-toggle-btn .icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

/* Rotazione icona quando espanso */
.expand-toggle-btn[aria-expanded="true"] .icon {
    transform: rotate(180deg);
}

/* SVG freccia */
.expand-toggle-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Testo del bottone */
.expand-toggle-btn .text-collapsed {
    display: inline;
}

.expand-toggle-btn .text-expanded {
    display: none;
}

.expand-toggle-btn[aria-expanded="true"] .text-collapsed {
    display: none;
}

.expand-toggle-btn[aria-expanded="true"] .text-expanded {
    display: inline;
}

/* Contenitore centrato per il bottone */
.expand-toggle-container {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
    z-index: 10;
}

/* Variante alternativa - stile minimal */
.expand-toggle-btn.minimal {
    background: transparent;
    color: var(--primary, #6366f1);
    border: 2px solid var(--primary, #6366f1);
    box-shadow: none;
}

.expand-toggle-btn.minimal:hover {
    background: var(--primary, #6366f1);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .expandable-section.collapsed {
        max-height: 250px;
    }
    
    .expand-toggle-btn {
        font-size: 0.9rem;
        padding: 0.65rem 1.25rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .expandable-section.collapsed::after {
        background: linear-gradient(to bottom, transparent 0%, #0b1020 100%);
    }
}

/* Animazione smooth per contenuto */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.expandable-section.expanded .expandable-content {
    animation: fadeIn 0.4s ease;
}

/* ============================================
   JAVASCRIPT PER EXPAND/COLLAPSE
   Inserire prima di </body>
   ============================================ */