:root {
    --colore-giallo: #CC8A00;
    --colore-blue: #002F6C;
    --colore-azzurro: #0092BC;
    --colore-verde: #4C8D2B;
    --colore-grigioScuro: #4A4A4A;
    --colore-grigioChiaro: #efefef;
    --colore-footer: #272727;
}

.b-example-divider {
    width: 100%;
    height: 3rem;
    background-color: rgba(0, 0, 0, .1);
    border: solid rgba(0, 0, 0, .15);
    border-width: 1px 0;
    box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
}

.bi {
    vertical-align: -.125em;
    fill: currentColor;
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    border-radius: .75rem;
}
  
.icon-square {
    width: 3rem;
    height: 3rem;
    border-radius: .75rem;
}
  
.text-shadow-1 { text-shadow: 0 .125rem .25rem rgba(0, 0, 0, .25); }
.text-shadow-2 { text-shadow: 0 .25rem .5rem rgba(0, 0, 0, .25); }
.text-shadow-3 { text-shadow: 0 .5rem 1.5rem rgba(0, 0, 0, .25); }
  
.card-cover {
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
}
  
.feature-icon-small {
    width: 3rem;
    height: 3rem;
}

.bg_yellow {
    background-color: var(--colore-giallo);
}

.bg_green {
    background-color: var(--colore-verde);
}

.bg_ciano {
    background-color: var(--colore-azzurro);
}
  
.footer-bg {
    background-color: var(--colore-footer);
    /*color: #ffffff;  Cambia il colore del testo se necessario per contrasto */
}

.color-style1 {
    color: var(--colore-blue);
}

.color-style2 {
    color: var(--colore-azzurro);
}

.accordion-header h2 {
    font-size: 1.5rem;
    font-weight: bold;
}

/* Modern polish and motion (respect reduced motion) */
:root {
    scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
    :root { scroll-behavior: auto; }
}

/* Navbar shadow on scroll */
.navbar.scrolled {
    box-shadow: 0 6px 24px rgba(0,0,0,0.08);
    background-color: rgba(255,255,255,0.9);
    backdrop-filter: saturate(180%) blur(6px);
}
/* Smooth navbar hide/show on scroll */
.navbar {
    transition: transform 250ms ease, background-color 300ms ease, box-shadow 300ms ease;
    will-change: transform;
}
.navbar.nav-hidden {
    transform: translateY(-100%);
}

/* Card subtle hover */
.card {
    transition: transform 300ms ease, box-shadow 300ms ease;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}
@media (prefers-reduced-motion: reduce) {
    .card { transition: none; }
    .card:hover { transform: none; box-shadow: none; }
}

/* Scroll-reveal base styles */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 600ms ease, transform 600ms ease;
    will-change: opacity, transform;
}
.reveal.reveal-right { transform: translateX(24px); }
.reveal.reveal-left  { transform: translateX(-24px); }
.reveal.reveal-fade  { transform: none; }
.reveal.is-visible {
    opacity: 1;
    transform: none;
}
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
}

/* Prevent CLS on card images */
.card-img-top {
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

/* Hero gradient overlay stripe */
.hero {
    position: relative;
    isolation: isolate;
    background:
      linear-gradient(135deg, rgba(0,47,108,0.95) 0%, rgba(0,146,188,0.85) 55%, rgba(255,255,255,0.0) 100%),
      radial-gradient(1200px 400px at 20% 0%, rgba(255,255,255,0.15), rgba(255,255,255,0));
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0));
}
.hero h1,
.hero .lead,
.hero p,
.hero .display-5 {
    color: #fff;
}
.hero .opacity-90 { opacity: .9; }
.hero .btn-primary { box-shadow: 0 8px 24px rgba(0,0,0,.18); }

/* Focus-visible accessibility polish */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--colore-azzurro);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0,146,188,0.25);
    border-radius: .35rem;
}

/* Enhance hover/focus for buttons and links */
.btn-primary:hover,
.btn-primary:focus-visible {
    filter: saturate(1.1) brightness(1.02);
}
.btn:active { transform: translateY(0); }

a {
    transition: color 200ms ease, text-shadow 200ms ease;
}
a:hover { text-shadow: 0 1px 0 rgba(255,255,255,0.2); }

/* Back-to-top floating button */
#backToTop.to-top {
    position: fixed;
    right: 1rem;
    bottom: 1.25rem;
    z-index: 1040;
    width: 52px;
    height: 52px;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    transition: opacity 300ms ease, transform 300ms ease;
}
#backToTop.to-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
@media (prefers-reduced-motion: reduce) {
    #backToTop.to-top { transition: none; }
}

/* Skip link for keyboard users */
.skip-link {
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    padding: .5rem .75rem;
    background-color: #000;
    color: #fff;
    z-index: 1050;
    border-radius: .25rem;
    transform: translateY(-150%);
    transition: transform 200ms ease;
}
.skip-link:focus { transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
    .skip-link { transition: none; }
}

/* Reduce motion transitions for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .navbar { transition: none; }
}