/* Project logo box for project cards */
.project-logo {
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8f9fa;
    border-radius: 1rem;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
}

.project-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

/* Spacing and separation for news articles */
#news-section .news-article {
    margin-bottom: 2rem;
    padding: 1.5rem 1.5rem 1rem 1.5rem;
    border-bottom: 1px solid #e0e0e0;
    background: #f7fafd;
    border-radius: 1rem;
    box-shadow: 0 2px 8px 0 rgba(13, 110, 253, 0.06);
    transition: box-shadow 0.2s;
}

#news-section .news-article:hover,
#news-section .news-article:focus-within {
    box-shadow: 0 4px 16px 0 rgba(13, 110, 253, 0.13);
}

#news-section .news-article h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #111;
    margin-bottom: 0.5rem;
}

#news-section .news-article p {
    color: #333;
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

/* Accessible accordion styles for news section */
.accordion-toggle {
    background: none;
    border: none;
    color: blue;
    text-decoration: underline;
    cursor: pointer;
    padding: 0;
    font-size: 1em;
}

.accordion-toggle:focus {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
}

.accordion-panel {
    margin-top: 0.5em;
    padding: 0.5em 0 0.5em 1.5em;
    border-left: 3px solid #0d6efd;
    background: #f8f9fa;
}

:root {
    --brand: #0b5cff;
    /* ensure good contrast */
    --muted: #000000;
    --bg: #ffffff;
}

/* Skip link visible on focus */
.skip-link {
    position: absolute;
    left: -999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    /* move on-screen and make visually prominent for keyboard users */
    left: 1rem;
    top: 1rem;
    width: auto;
    height: auto;
    padding: .5rem 1rem;
    background: var(--brand);
    color: #fff;
    z-index: 5000;
    border-radius: .25rem;
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
}

/* Ensure the main landmark is scrolled into view past the sticky header */
main {
    scroll-margin-top: 6rem;
}

/* Larger focus outlines for keyboard users */
:focus {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
}

/* High-contrast headings */
h1,
h2,
h3 {
    color: #0a2540
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important
    }
}

/* Minor styling for hero */
.hero {
    padding: 4rem 1rem;
    background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.profile-img {
    width: 140px;
    height: 140px;
    object-fit: cover;
    border-radius: 50%;
}

.muted {
    color: var(--muted)
}

/* Ensure readable font sizes */
body {
    font-size: 1rem;
    line-height: 1.6;
    color: #222;
    background: var(--bg);
}

/* Make interactive elements obvious */
.card a {
    color: var(--brand)
}

/* Links: visible, recognisable, and accessible (WCAG) */
a {
    color: var(--brand);
    text-decoration: underline;
    text-decoration-thickness: auto;
}

a:hover,
a:active {
    color: #083bb2;
    text-decoration: underline;
}

/* Clear keyboard focus for links (use focus-visible where available) */
a:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
    text-decoration: underline;
}

/* Preserve button visuals (don't force underline on Bootstrap buttons) */
a.btn,
button,
.btn {
    text-decoration: none;
}

/* Strong focus style for primary hero action links to improve visibility */
.hero a[href="#who"]:focus-visible,
.hero a[href="#publications"]:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(255, 191, 71, 0.12);
    background: rgba(87, 148, 228, 0.05);
}

/* Apply same visible focus to primary buttons site-wide */
.btn-primary:focus-visible,
.btn-outline-primary:focus-visible,
.btn:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(255, 191, 71, 0.12);
    background: rgba(87, 148, 228, 0.05);
    color: black;
}

/* Make navbar items more visible when active/hovered/focused */
.navbar .nav-link {
    padding: 0.35rem 0.5rem;
    /* slightly larger hit area */
    border-radius: 0.25rem;
    text-decoration: underline; /* Sottolineato per distinguere i link */
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
    color: #062042;
    /* darker text for contrast */
    background-color: rgba(11, 92, 255, 0.08);
    /* subtle brand-tinted background */
    text-decoration: none; /* Rimuovi il sottolineato per indicare interazione */
}

/* Strong keyboard focus for navbar links */
.navbar .nav-link:focus-visible,
.navbar .nav-link:focus {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(255, 191, 71, 0.12);
    background-color: rgba(11, 92, 255, 0.06);
    color: #062042;
}

/* Ensure contrast for white/dark navbars (footer links use text-white so skip) */
@media (prefers-contrast: more) {

    .navbar .nav-link.active,
    .navbar .nav-link:focus-visible {
        background-color: rgba(11, 92, 255, 0.15);
    }
}

.py-5 {
    padding-top: 4rem !important;
    padding-bottom: 3rem !important;
}

/* Back-to-top button */
#back-to-top {
    position: fixed;
    right: 1rem;
    bottom: 4.5rem;
    z-index: 9999;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .45rem .65rem;
    border-radius: .375rem;
    background: #062042;
    /* dark blue for contrast */
    color: #fff;
    box-shadow: 0 6px 18px rgba(6, 32, 66, 0.18);
    border: none;
    cursor: pointer;
    font-weight: 600;
}

/* Hidden state (not focusable) */
#back-to-top[aria-hidden="true"] {
    display: none;
}

#back-to-top:focus-visible {
    outline: 3px solid #ffbf47;
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(255, 191, 71, 0.12);
}