* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #0066cc;
    --primary-blue-dark: #004d99;
    --primary-blue-light: #3385d6;
    --secondary-blue: #e6f2ff;
    --white: #ffffff;
    --text-dark: #1a1a1a;
    --text-gray: #4a4a4a;
    --border-light: #d9d9d9;
    --focus-outline: #0066cc;
    --hover-bg: #f0f8ff;
    --card-bg: linear-gradient(180deg, rgba(230, 242, 255, 0.4), rgba(255, 255, 255, 0.9));
    --card-shadow: 0 4px 12px rgba(0, 102, 204, 0.08);
    --card-hover-shadow: 0 8px 20px rgba(0, 102, 204, 0.12);
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(to bottom, #f5f9ff 0%, #ffffff 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Skip to main content link for screen readers */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 1em;
    background-color: var(--primary-blue);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
}

.skip-to-main:focus {
    left: 50%;
    transform: translateX(-50%);
    top: 1em;
}

header {
    background: var(--white);
    color: var(--text-dark);
    padding: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary-blue);
    transition: background 0.3s ease, border-color 0.3s ease;
}

/* Header centrato per index.html */
.header-inner.header-centered {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 40px;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
}

/* Header per viewer.html con pulsante a sinistra */
.header-inner.viewer-header-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 40px;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

.header-inner.viewer-header-inner .back-btn {
    position: absolute;
    left: 40px;
    background: #6c757d;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    transition: background 0.3s ease;
}

.header-inner.viewer-header-inner .back-btn:hover {
    background: #5a6268;
}

.brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    width: 55px;
    height: 55px;
    display: block;
}

.brand-text h1 {
    font-size: 1.75rem;
    margin: 0;
    line-height: 1.2;
    font-weight: 700;
    color: var(--primary-blue);
}

.brand-text p {
    margin: 4px 0 0 0;
    font-size: 0.9rem;
    color: var(--text-gray);
}

.tab-btn {
    background: transparent;
    color: var(--text-gray);
    border: 2px solid var(--border-light);
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: 8px;
    letter-spacing: 0.3px;
}

.tab-btn:hover {
    color: var(--primary-blue);
    background: var(--hover-bg);
    border-color: var(--primary-blue-light);
}

.tab-btn:focus {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

.tab-btn.active {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

.tab-content {
    display: none;
    padding: 40px;
    min-height: calc(100vh - 200px);
}

.tab-content.active {
    display: block;
}

/* Documentation panel controls and card layout */
.documentation .doc-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 18px;
    /* Allow tab buttons to wrap on small screens */
    flex-wrap: wrap;
}

.doc-panels {
    margin-top: 8px;
}

.doc-panel {
    display: none;
}

.doc-panel.active {
    display: block;
}

/* Unified card style for all sections */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 16px 0 24px 0;
}

.card,
.diapositiva-item,
.verbali-folder summary,
.team-member {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    padding: 18px;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
}

/* Limita la larghezza massima delle card per mantenere dimensioni uniformi */
.cards .card {
    max-width: 100%;
    min-width: 0; /* Permette alle card di ridursi sotto minmax */
    /* Su schermi grandi, limita la larghezza per evitare che le card singole si espandano troppo */
    width: 100%;
}

/* Quando c'è una sola card, limita la larghezza massima */
.cards:has(.card:only-child) .card {
    max-width: 350px;
}

.card:hover,
.diapositiva-item:hover,
.team-member:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--primary-blue-light);
}

.card h4,
.diapositiva-item h4,
.verbali-folder summary,
.member-name {
    margin: 0 0 10px 0;
    color: var(--primary-blue);
    font-size: 1.1rem;
    font-weight: 600;
}

.card p {
    margin: 0 0 12px 0;
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.5;
}

.card p:last-child {
    margin-bottom: 0;
}

/* Ensure anchor targets sit nicely under the sticky header */
section[role="region"] {
    scroll-margin-top: 92px; /* header height + small gap */
}

/* Styles for verbali collapsible folders using details/summary */
.verbali-folder {
    margin: 20px 0 10px 0;
    border: 1px solid var(--border-light);
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
    box-shadow: var(--card-shadow);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.verbali-folder summary {
    list-style: none;
    padding: 16px 20px 16px 48px;
    cursor: pointer;
    font-weight: 700;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-light);
    position: relative;
    margin: 0;
    border: none;
    border-radius: 0;
    font-size: 1.1rem;
}

.verbali-folder[open] summary {
    background: var(--card-bg);
    color: var(--primary-blue);
    border-bottom: 1px solid var(--border-light);
}

/* Arrow caret indicator for collapsible folders */
.verbali-folder summary::before {
    content: "▸"; /* triangular caret */
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
    font-size: 1.1rem;
    line-height: 1;
    color: var(--primary-blue);
    transition: transform 0.2s ease;
}

.verbali-folder[open] summary::before {
    transform: translateY(-50%) rotate(90deg);
    color: var(--primary-blue);
}

.verbali-folder .doc-list {
    padding: 16px 20px;
    margin: 0;
    background: var(--white);
    transition: background 0.3s ease;
}

.verbali-folder .doc-list li a {
    display: block;
    padding: 8px 6px;
}

.content-box {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: 40px 50px;
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.08);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.page-title {
    color: var(--primary-blue);
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 30px 0;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-blue);
}

.section-title {
    color: var(--primary-blue);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 35px 0 20px 0;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--primary-blue);
    letter-spacing: 0.5px;
}

.section-title:first-child {
    margin-top: 0;
}

.subsection-title {
    color: var(--text-dark);
    font-size: 1.15rem;
    font-weight: 600;
    margin: 25px 0 15px 0;
    padding-left: 15px;
    border-left: 4px solid var(--primary-blue-light);
}

.doc-list {
    list-style: none;
    padding: 0;
    margin: 15px 0;
}

.doc-list li {
    margin: 0;
    border-bottom: 1px solid rgba(0, 102, 204, 0.1);
    transition: background-color 0.2s ease;
}

.doc-list li:hover {
    background-color: var(--hover-bg);
}

.doc-list li:last-child {
    border-bottom: none;
}

.doc-list a {
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    /* make anchors inline-level flex containers so viewer links can sit on the same line */
    display: inline-flex;
    align-items: center;
    padding: 14px 16px;
    transition: all 0.2s ease;
    border-radius: 6px;
    margin: 2px 0;
}

.doc-list a:hover {
    background: var(--hover-bg);
    color: var(--primary-blue-dark);
    padding-left: 24px;
}

.doc-list a:focus {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
    background: var(--secondary-blue);
}

.doc-list.verbali {
    margin-left: 0;
    padding-left: 25px;
    border-left: 2px solid var(--secondary-blue);
}

/* Layout for verbali list items: put file title and action buttons on one line */
.doc-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 6px;
}

.file-title {
    color: var(--primary-blue);
    font-weight: 600;
    flex: 1 1 auto; /* allow title to take remaining space */
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-open {
    background: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
}

.btn-open:hover,
.btn-open:focus {
    background: var(--hover-bg);
    transform: translateY(-1px);
}

.btn-viewer {
    background: var(--primary-blue);
    color: var(--white);
    border: 1px solid var(--primary-blue);
}

.btn-viewer:hover,
.btn-viewer:focus {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
}

/* Chi Siamo Section Styles */
.team-info {
    line-height: 1.8;
}

.team-intro {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 30px;
    line-height: 1.8;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.team-member {
    padding: 25px;
    text-align: center;
    border: 2px solid var(--border-light);
}

.team-member:hover {
    transform: translateY(-5px);
    border-color: var(--primary-blue-light);
}

.member-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.member-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.member-name {
    margin: 10px 0 5px 0;
}

.member-role {
    color: var(--text-gray);
    font-size: 0.9rem;
    margin: 0;
}

.project-description {
    font-size: 1rem;
    color: var(--text-dark);
    line-height: 1.8;
    margin: 20px 0;
}

.contact-info {
    margin-top: 30px;
    padding: 25px;
    background: var(--hover-bg);
    border-radius: 10px;
    border-left: 4px solid var(--primary-blue);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.contact-info p {
    margin: 10px 0;
    font-size: 1rem;
}

.contact-info a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease;
}

.contact-info a:hover {
    border-bottom-color: var(--primary-blue);
}

.contact-info a:focus {
    outline: 2px solid var(--focus-outline);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Visually hidden class for screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* Diapositive vertical list */
.diapositive-vertical {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 16px 0 24px 0;
}

.diapositiva-links {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.diapositiva-links .separator {
    color: var(--text-gray);
    font-size: 0.9rem;
    opacity: 0.5;
}

.diapositiva-links a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.diapositiva-links a:hover {
    background: var(--hover-bg);
    transform: translateY(-1px);
}

/* MODIFICA: Rendi il testo "Apri con Viewer" bianco in modalità chiara */
.diapositiva-links .viewer-link {
    color: #ffffff; /* Bianco invece di verde */
    background-color: var(--primary-blue);
    padding: 6px 12px;
    border-radius: 4px;
}

.diapositiva-links .viewer-link:hover {
    color: #ffffff;
    background: var(--primary-blue-dark);
    text-decoration: none;
}

/* Unified link styles for all sections */
.card p a,
.diapositiva-links a,
.doc-list a,
.team-member a {
    color: var(--primary-blue);
    text-decoration: none;
}

.card p a:hover,
.diapositiva-links a:hover,
.doc-list a:hover,
.team-member a:hover {
    color: var(--primary-blue-dark);
}

/* MODIFICA: Rendi il testo "Apri con Viewer" nelle card bianco */
.card p a.viewer-link {
    color: #ffffff;
    background-color: var(--primary-blue);
    padding: 4px 8px;
    border-radius: 4px;
}

.card p a.viewer-link:hover {
    color: #ffffff;
    background: var(--primary-blue-dark);
}

/* Stili per i bottoni "Apri con viewer" nelle liste */
.btn-viewer.viewer-link {
    color: var(--white);
    text-decoration: none;
    border-color: var(--primary-blue);
}

.btn-viewer.viewer-link:hover,
.btn-viewer.viewer-link:focus {
    background: var(--primary-blue-dark);
    color: var(--white);
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* ===== PULSANTE TORNA SU ===== */
.torna-su-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
}

.torna-su-btn.visible {
    opacity: 1;
    transform: translateY(0);
}

.torna-su-btn:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

.torna-su-btn:active {
    transform: translateY(-1px);
}

/* ===== PULSANTE MODALITÀ SCURA/CHIARA ===== */
.tema-toggle-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 1000;
}

.tema-toggle-btn:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

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

.tema-toggle-btn .icon {
    transition: transform 0.3s ease;
}

.tema-toggle-btn.dark .icon {
    transform: rotate(180deg);
}

/* ===== MODALITÀ SCURA ===== */
body.dark-theme {
    --primary-blue: #4a9eff;
    --primary-blue-dark: #2a7bdf;
    --primary-blue-light: #6ab2ff;
    --secondary-blue: #1a2b3c;
    --white: #1a1a1a;
    --text-dark: #e0e0e0;
    --text-gray: #a0a0a0;
    --border-light: #2d2d2d;
    --hover-bg: #2a2a2a;
    --card-bg: linear-gradient(180deg, rgba(74, 158, 255, 0.1), rgba(26, 26, 26, 0.9));
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --card-hover-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

body.dark-theme {
    background: linear-gradient(to bottom, #0f1a2a 0%, #1a1a1a 100%);
    color: var(--text-dark);
}

body.dark-theme header {
    background: #2d2d2d;
    border-bottom: 3px solid var(--primary-blue);
}

body.dark-theme .content-box {
    background: #2d2d2d;
    border: 1px solid var(--border-light);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

body.dark-theme .card,
body.dark-theme .diapositiva-item,
body.dark-theme .team-member,
body.dark-theme .verbali-folder summary {
    background: linear-gradient(180deg, rgba(74, 158, 255, 0.1), rgba(45, 45, 45, 0.9));
    border: 1px solid var(--border-light);
}

body.dark-theme .verbali-folder {
    background: #2d2d2d;
    border: 1px solid var(--border-light);
}

body.dark-theme .verbali-folder .doc-list {
    background: #2d2d2d;
}

body.dark-theme .verbali-folder[open] summary {
    background: linear-gradient(90deg, var(--primary-blue-light), rgba(74, 158, 255, 0.1));
}

body.dark-theme .doc-list li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.dark-theme .doc-list li:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

body.dark-theme .doc-list a:hover {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-theme .contact-info {
    background: rgba(255, 255, 255, 0.05);
    border-left: 4px solid var(--primary-blue);
}

/* MODIFICA: In modalità scura, mantieni il colore verde per "Apri con viewer" */
body.dark-theme .diapositiva-links .viewer-link {
    color: #4cd964;
    background-color: transparent;
}

body.dark-theme .diapositiva-links .viewer-link:hover {
    color: #3ac753;
    background: rgba(76, 217, 100, 0.1);
}

body.dark-theme .btn-open {
    background: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
}

body.dark-theme .btn-open:hover {
    background: rgba(74, 158, 255, 0.1);
}

body.dark-theme .btn-viewer {
    background: var(--primary-blue);
    color: #1a1a1a;
    border: 1px solid var(--primary-blue);
}

body.dark-theme .btn-viewer:hover {
    background: var(--primary-blue-dark);
}

body.dark-theme .contact-info a {
    color: var(--primary-blue);
}

body.dark-theme .tab-btn {
    color: var(--text-gray);
    border: 2px solid var(--border-light);
    background: rgba(255, 255, 255, 0.05);
}

body.dark-theme .tab-btn:hover {
    color: var(--primary-blue);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-blue-light);
}

body.dark-theme .tab-btn.active {
    background: var(--primary-blue);
    color: #1a1a1a;
    border-color: var(--primary-blue);
}

body.dark-theme .page-title,
body.dark-theme .section-title,
body.dark-theme .brand-text h1 {
    color: var(--primary-blue);
}

body.dark-theme .subsection-title {
    color: var(--text-dark);
    border-left: 4px solid var(--primary-blue-light);
}

body.dark-theme .team-intro,
body.dark-theme .project-description {
    color: var(--text-dark);
}

body.dark-theme .member-role {
    color: var(--text-gray);
}

body.dark-theme .brand-text p {
    color: var(--text-gray);
}

body.dark-theme .header-inner.viewer-header-inner .back-btn {
    background: #495057;
    color: #e0e0e0;
}

body.dark-theme .header-inner.viewer-header-inner .back-btn:hover {
    background: #5a6268;
}

/* MODIFICA: In modalità scura, per i link nelle card */
body.dark-theme .card p a.viewer-link {
    color: #4cd964;
    background-color: transparent;
}

body.dark-theme .card p a.viewer-link:hover {
    color: #3ac753;
    background: rgba(76, 217, 100, 0.1);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-blue: #0052a3;
        --text-dark: #000000;
        --border-light: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Responsive styles */
@media (max-width: 768px) {
    .header-inner.header-centered,
    .header-inner.viewer-header-inner {
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }
    
    .header-inner.viewer-header-inner .back-btn {
        position: static;
        align-self: flex-start;
        margin-bottom: 10px;
    }
    
    .tab-content {
        padding: 20px 15px;
    }
    
    .content-box {
        padding: 25px 20px;
    }
    
    .page-title {
        font-size: 1.6rem;
    }
    
    .brand-text h1 {
        font-size: 1.4rem;
    }
    
    .brand-text p {
        font-size: 0.8rem;
    }
    
    .logo {
        width: 45px;
        height: 45px;
    }
    
    .section-title {
        font-size: 1.3rem;
    }
    
    .doc-list a {
        font-size: 0.95rem;
        padding: 12px;
    }

    /* Make tab buttons responsive: allow shrinking and wrapping */
    .documentation .doc-controls .tab-btn {
        flex: 1 1 40%; /* try two per row when possible */
        min-width: 140px;
        padding: 10px 14px;
    }
    
    .team-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .team-member {
        padding: 20px;
    }
    
    /* Pulsanti responsive */
    .torna-su-btn {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
    
    .tema-toggle-btn {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .header-inner.header-centered,
    .header-inner.viewer-header-inner {
        padding: 15px;
    }
    
    .brand-text h1 {
        font-size: 1.2rem;
    }
    
    .brand-text p {
        font-size: 0.75rem;
    }
    
    .content-box {
        padding: 20px 15px;
    }
    
    .page-title {
        font-size: 1.4rem;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .member-icon {
        font-size: 2.5rem;
    }

    /* On very small screens stack tab buttons vertically for best usability */
    .documentation .doc-controls {
        gap: 8px;
    }

    .documentation .doc-controls .tab-btn {
        flex: 1 1 100%;
        min-width: 0;
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    
    /* Pulsanti responsive */
    .torna-su-btn {
        bottom: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .tema-toggle-btn {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}

/* PDF Viewer Link Styles */
.viewer-link {
    color: #ffffff; /* MODIFICA: Bianco invece di verde */
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9em;
    background-color: var(--primary-blue);
    padding: 4px 8px;
    border-radius: 4px;
}

.viewer-link:hover {
    color: #ffffff;
    background-color: var(--primary-blue-dark);
    text-decoration: none;
}

.viewer-link:focus {
    outline: 2px solid var(--focus-outline);
    outline-offset: 2px;
}

/* Ensure viewer buttons (which also have .viewer-link) remain readable on blue background */
.btn-viewer.viewer-link {
    color: var(--white);
    text-decoration: none;
    border-color: var(--primary-blue);
}

.btn-viewer.viewer-link:hover,
.btn-viewer.viewer-link:focus {
    background: var(--primary-blue-dark);
    color: var(--white);
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* MODIFICA: In modalità scura, ripristina il colore verde per .viewer-link */
body.dark-theme .viewer-link {
    color: #4cd964;
    background-color: transparent;
}

body.dark-theme .viewer-link:hover {
    color: #3ac753;
    background-color: rgba(76, 217, 100, 0.1);
}

/* Hide viewer links on mobile devices since iframe viewer doesn't work on mobile */
@media screen and (max-width: 767px) {
    .viewer-link {
        display: none !important;
        visibility: hidden !important;
        pointer-events: none !important;
    }
    
    .diapositiva-links .separator {
        display: none;
    }
}