/*
 * Tema condiviso di articoli e corsi della sezione formazione.
 * Di base: stile chiaro (sfondo bianco, come gli articoli).
 * Se il dispositivo o il browser sono impostati sul tema scuro (prefers-color-scheme: dark)
 * la pagina passa automaticamente allo stile scuro. Nessun interruttore: segue le impostazioni dell'utente.
 * Gli screenshot restano leggibili in entrambi i temi: hanno sempre un fondo bianco e un bordo ben visibile.
 */

/* ---------- Variabili: tema chiaro (predefinito) ---------- */
:root {
    color-scheme: light;

    /* nomi storici usati anche dentro l'HTML dei corsi */
    --neon-cyan: #0097a7;
    --neon-magenta: #c2185b;
    --neon-lime: #4a8a00;
    --neon-yellow: #9a6b00;
    --neon-gold: #b8860b;

    --course-card: #ffffff;
    --course-card-alt: #f5f5f5;
    --card-border: #e0e0e0;
    --course-border: #e0e0e0;
    --course-text: #4a545e;
    --course-strong: #1a1a1a;
    --course-heading: #0d1b2a;
    --course-muted: #6c757d;
    --course-shadow: rgba(13, 27, 42, 0.08);
    --course-accent-bg: rgba(0, 151, 167, 0.07);
    --course-accent-bg-strong: rgba(0, 151, 167, 0.14);
    --course-gold-bg: #fbf2df;
    --course-lime-bg: #eef7e2;
    --course-orange-bg: #fdf0e0;
    --course-on-accent: #ffffff;
    --course-tip-bg: #0d1b2a;
    --course-tip-text: #f1f5f9;
    --course-note-bg: #e6f9fc;
    --course-img-border: #c9d1d9;
}

/* ---------- Variabili: tema scuro (solo se impostato dall'utente) ---------- */
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;

        --neon-cyan: #00e5ff;
        --neon-magenta: #ff4da6;
        --neon-lime: #a6ff00;
        --neon-yellow: #ffe600;
        --neon-gold: #d4af37;

        --course-card: #111a27;
        --course-card-alt: #0e1621;
        --card-border: rgba(255, 255, 255, 0.1);
        --course-border: rgba(255, 255, 255, 0.12);
        --course-text: #cbd5e1;
        --course-strong: #ffffff;
        --course-heading: #f1f5f9;
        --course-muted: #94a3b8;
        --course-shadow: rgba(0, 0, 0, 0.45);
        --course-accent-bg: rgba(0, 229, 255, 0.06);
        --course-accent-bg-strong: rgba(0, 229, 255, 0.16);
        --course-gold-bg: rgba(255, 230, 0, 0.06);
        --course-lime-bg: rgba(166, 255, 0, 0.06);
        --course-orange-bg: rgba(255, 145, 0, 0.07);
        --course-on-accent: #0b0f19;
        --course-tip-bg: #05080d;
        --course-tip-text: #f1f5f9;
        --course-note-bg: rgba(0, 229, 255, 0.08);
        --course-img-border: rgba(255, 255, 255, 0.35);
    }

    /* Le variabili del sito, rimappate solo dentro il corpo dell'articolo: menu, testata e piè di pagina restano com'erano */
    .article-section {
        --white: #0b121b;
        --black: #e8eef5;
        --dark: #f1f5f9;
        --light: #152030;
        --gray: #aab6c5;
        --gray-light: #2a3a4d;
        --cyan-dark: #4dd0e1;
        --gold-dark: #e6b422;
        --shadow: rgba(0, 0, 0, 0.5);
        background: var(--white);
        color: var(--black);
    }
    .article-section .article-callout { background: rgba(0, 229, 255, 0.08); }
    .article-section .article-callout.callout-gold { background: rgba(230, 180, 34, 0.1); }
    .article-section .article-callout.callout-neutral { background: var(--light); }
    .article-section .article-table th { background: #1f3347; color: #fff; }
    .article-section .btn-download-pdf { background: #00838f; }
    .article-section .btn-download-pdf:hover { background: var(--gold); }
}

/* ---------- Screenshot e immagini: leggibili sia su fondo chiaro che scuro ---------- */
.article-section .article-container img,
.article-section .article-figure img,
.course-img-card img {
    background: #ffffff;
    border: 1px solid var(--course-img-border);
}

/* ---------- Corsi: indice delle lezioni ---------- */
html { scroll-behavior: smooth; }

.course-toc {
    background: var(--course-card-alt);
    border: 1px solid var(--course-border);
    border-top: 4px solid var(--neon-cyan);
    border-radius: 16px;
    padding: 28px;
    margin: 2.5rem 0 3.5rem 0;
    box-shadow: 0 8px 24px var(--course-shadow);
}
.course-toc h3 {
    color: var(--neon-cyan);
    font-size: 1.4rem;
    margin: 0 0 1.2rem 0;
    display: flex;
    align-items: center;
    gap: 10px;
}
.course-toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}
.course-toc-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 10px;
    text-decoration: none;
    color: var(--course-strong);
    transition: all 0.25s ease;
    font-size: 0.92rem;
}
.course-toc-item:hover {
    background: var(--course-accent-bg);
    border-color: var(--neon-cyan);
    transform: translateY(-2px);
}
.course-toc-num {
    background: var(--neon-cyan);
    color: var(--course-on-accent);
    font-weight: 700;
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 6px;
    flex-shrink: 0;
}
.course-toc-title { font-weight: 500; line-height: 1.35; }
.course-toc-item.active {
    background: var(--course-accent-bg-strong);
    border-color: var(--neon-cyan);
    box-shadow: 0 0 0 2px var(--neon-cyan);
    transform: translateY(-2px);
}
.course-toc-item.active .course-toc-num { background: var(--course-strong); color: var(--course-card); }

/* ---------- Corsi: scheda lezione ---------- */
.lesson-card {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 4rem;
    box-shadow: 0 10px 30px var(--course-shadow);
    position: relative;
    overflow: visible;
    overflow-x: clip; /* evita lo scorrimento orizzontale della pagina su mobile */
    display: none;
}
.lesson-card.active-lesson { display: block; animation: fadeInLesson 0.35s ease; }
@keyframes fadeInLesson {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}
.lesson-card-header {
    border-bottom: 1px solid var(--course-border);
    padding-bottom: 24px;
    margin-bottom: 30px;
}
.lesson-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.lesson-badge {
    display: inline-block;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--neon-cyan);
    background: var(--course-accent-bg);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--neon-cyan);
}
/* Pulsante PDF: lo stesso degli articoli */
.btn-download-pdf {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: #0097a7;
    color: #fff !important;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(0, 188, 212, 0.3);
    transition: all 0.25s ease;
}
.btn-download-pdf:hover { background: #d4a017; color: #fff !important; transform: translateY(-2px); box-shadow: 0 6px 18px rgba(212, 160, 23, 0.3); }
.btn-download-pdf i { font-size: 1.1rem; color: #fff; }
@media (prefers-color-scheme: dark) {
    .btn-download-pdf { background: #00838f; }
}
.lesson-title { font-size: 1.9rem; color: var(--course-heading); margin-bottom: 8px; line-height: 1.3; }
.lesson-subtitle { font-size: 1.05rem; color: var(--course-muted); font-style: italic; }

/* Obiettivi */
.lesson-objectives {
    background: var(--course-lime-bg);
    border-left: 4px solid var(--neon-lime);
    padding: 18px 24px;
    border-radius: 0 12px 12px 0;
    margin: 24px 0 32px 0;
}
.lesson-objectives h4 { color: var(--neon-lime); font-size: 1rem; margin: 0 0 10px 0; font-weight: 700; }
.lesson-objectives ul { margin: 0; padding-left: 20px; color: var(--course-text); font-size: 0.95rem; line-height: 1.6; }

/* Titoli e testi */
.lesson-card h3 {
    color: var(--neon-cyan);
    font-size: 1.45rem;
    margin: 2.4rem 0 1rem 0;
    font-weight: 600;
    border-bottom: 1px dashed var(--course-border);
    padding-bottom: 8px;
}
.lesson-card h4 { color: var(--neon-yellow); font-size: 1.2rem; margin: 1.8rem 0 0.8rem 0; font-weight: 600; }
.lesson-card h5 { color: var(--course-heading); font-size: 1.05rem; margin: 1.4rem 0 0.6rem 0; font-weight: 600; }
.lesson-card p { color: var(--course-text); font-size: 1rem; line-height: 1.75; margin-bottom: 1.2rem; }
.lesson-card ul, .lesson-card ol {
    color: var(--course-text);
    font-size: 0.98rem;
    line-height: 1.7;
    margin: 0 0 1.4rem 0;
    padding-left: 24px;
}
.lesson-card ul { list-style: disc; }
.lesson-card ol { list-style: decimal; }
.lesson-card li { margin-bottom: 6px; color: var(--course-text); }
.lesson-card strong { color: var(--course-heading); }
.lesson-card a { color: var(--neon-cyan); font-weight: 600; }
.lesson-card a:hover { color: var(--neon-gold); }
.lesson-card .btn { font-weight: 600; }
.lesson-card .btn-outline {
    background: transparent;
    border: 2px solid var(--course-border);
    color: var(--course-strong);
}
.lesson-card .btn-outline:hover { background: var(--course-accent-bg); border-color: var(--neon-cyan); color: var(--course-strong); box-shadow: none; }
.lesson-card .btn-primary { color: #fff; }
.lesson-bottom-nav { border-top: 1px solid var(--course-border); }

/* ---------- Immagini dei corsi ---------- */
.course-img-card {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 14px;
    overflow: hidden;
    margin: 2rem 0 2.4rem 0;
    box-shadow: 0 8px 22px var(--course-shadow);
    transition: transform 0.3s ease, border-color 0.3s ease;
}
.course-img-card:hover { transform: translateY(-4px); border-color: var(--neon-cyan); }
.course-img-card img {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    display: block;
    border-radius: 0;
    box-shadow: none;
    border-width: 0 0 1px 0;
    cursor: pointer;
}
.course-img-info { padding: 16px 20px; background: var(--course-card-alt); display: flex; flex-direction: column; gap: 6px; }
.course-img-tag { font-size: 0.72rem; color: var(--neon-yellow); font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; }
.course-img-title { font-size: 1.05rem; font-weight: 700; color: var(--course-heading); }
.course-img-desc { font-size: 0.9rem; color: var(--course-muted); line-height: 1.5; }

/* ---------- Riquadri ---------- */
.course-callout {
    background: var(--course-accent-bg);
    border-radius: 12px;
    padding: 20px 24px;
    margin: 2rem 0;
    position: relative;
    border-left: 5px solid var(--neon-cyan);
}
.course-callout.callout-cyan { border-left-color: var(--neon-cyan); background: var(--course-accent-bg); }
.course-callout.callout-cyan .callout-header { color: var(--neon-cyan); }
.course-callout.callout-gold { border-left-color: var(--neon-gold); background: var(--course-gold-bg); }
.course-callout.callout-gold .callout-header { color: var(--neon-yellow); }
.course-callout.callout-lime { border-left-color: var(--neon-lime); background: var(--course-lime-bg); }
.course-callout.callout-lime .callout-header { color: var(--neon-lime); }
.course-callout.callout-orange { border-left-color: #ff9100; background: var(--course-orange-bg); }
.course-callout.callout-orange .callout-header { color: #c76a00; }
@media (prefers-color-scheme: dark) {
    .course-callout.callout-orange .callout-header { color: #ff9100; }
}
.callout-header { font-size: 1.12rem; font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.callout-body p { color: var(--course-text); font-size: 0.96rem; line-height: 1.7; margin-bottom: 0.8rem; }
.callout-body p:last-child { margin-bottom: 0; }

/* ---------- Tabelle ---------- */
.table-responsive {
    overflow-x: auto;
    margin: 2rem 0;
    border-radius: 12px;
    border: 1px solid var(--course-border);
}
.course-table { width: 100%; border-collapse: collapse; font-size: 0.93rem; background: var(--course-card); color: var(--course-text); }
.course-table caption { caption-side: bottom; font-size: 0.85rem; color: var(--course-muted); padding: 0.6rem; text-align: center; font-style: italic; }
.course-table th {
    background: #0d1b2a;
    color: #fff;
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    white-space: nowrap;
}
@media (prefers-color-scheme: dark) {
    .course-table th { background: #1f3347; }
}
.course-table td { padding: 12px 16px; border-bottom: 1px solid var(--course-border); line-height: 1.6; vertical-align: top; color: var(--course-text); }
.course-table tr:nth-child(even) td { background: var(--course-card-alt); }
.course-table tr:last-child td { border-bottom: none; }
.course-table td:first-child, .course-table td:first-child strong { color: var(--course-heading); }

/* ---------- Glossario: suggerimenti al passaggio del mouse ---------- */
.glossary-tooltip {
    position: relative;
    cursor: help;
    color: var(--neon-cyan);
    border-bottom: 1.5px dotted var(--neon-cyan);
    font-weight: 500;
    transition: all 0.2s ease;
    text-decoration: none;
}
.glossary-tooltip:hover { background: var(--course-accent-bg-strong); border-bottom-style: solid; }
.glossary-tooltip::after {
    content: attr(data-term) ":\A" attr(data-def);
    white-space: pre-wrap;
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--course-tip-bg);
    color: var(--course-tip-text);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 400;
    line-height: 1.45;
    width: max-content;
    max-width: 320px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
    border: 1px solid var(--neon-cyan);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    z-index: 1000;
    pointer-events: none;
    text-align: left;
}
.glossary-tooltip::before {
    content: "";
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 6px;
    border-style: solid;
    border-color: var(--neon-cyan) transparent transparent transparent;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    z-index: 1001;
    pointer-events: none;
}
.glossary-tooltip:hover::after, .glossary-tooltip:hover::before { opacity: 1; visibility: visible; }

/* ---------- Glossario unico ---------- */
.glossary-section {
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 2px solid var(--course-border);
    scroll-margin-top: 100px;
}
.glossary-section-header { text-align: center; margin-bottom: 2rem; }
.glossary-section-header h2 { font-size: 2.2rem; color: var(--course-heading); margin: 0 0 10px; }
.glossary-section-header p { color: var(--course-muted); max-width: 700px; margin: 0 auto; }
.glossary-controls { margin-bottom: 2.2rem; display: flex; flex-direction: column; gap: 16px; align-items: center; }
.glossary-alpha-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    background: var(--course-card-alt);
    padding: 10px 16px;
    border-radius: 30px;
    border: 1px solid var(--course-border);
    max-width: 100%;
}
.glossary-alpha-btn {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    color: var(--course-strong);
    font-size: 0.85rem;
    font-weight: 600;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
}
.glossary-alpha-btn[data-letter="ALL"] { width: auto; padding: 0 14px; border-radius: 16px; font-size: 0.8rem; letter-spacing: 0.05em; }
.glossary-alpha-btn:hover:not(.disabled) { background: var(--course-accent-bg-strong); border-color: var(--neon-cyan); transform: translateY(-2px); }
.glossary-alpha-btn.active { background: var(--neon-cyan); border-color: var(--neon-cyan); color: var(--course-on-accent); font-weight: 700; transform: scale(1.05); }
.glossary-alpha-btn.disabled { opacity: 0.3; cursor: not-allowed; border-color: transparent; color: var(--course-muted); }
.glossary-actions { display: flex; justify-content: space-between; align-items: center; width: 100%; max-width: 900px; padding: 0 10px; flex-wrap: wrap; gap: 12px; }
.glossary-count-badge { font-size: 0.88rem; color: var(--course-muted); background: var(--course-card-alt); padding: 6px 14px; border-radius: 20px; border: 1px solid var(--course-border); }
.glossary-count-badge i { color: var(--neon-cyan); margin-right: 6px; }
.glossary-toggle-buttons { display: flex; gap: 8px; }
.btn-toggle-all {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    color: var(--course-strong);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.btn-toggle-all:hover { background: var(--course-accent-bg-strong); border-color: var(--neon-cyan); }
.glossary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; align-items: start; }
.glossary-item {
    background: var(--course-card);
    border: 1px solid var(--course-border);
    border-radius: 12px;
    padding: 16px 20px;
    transition: all 0.25s ease;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 4px 14px var(--course-shadow);
}
.glossary-item:hover { border-color: var(--neon-cyan); transform: translateY(-2px); background: var(--course-card-alt); }
.glossary-item.expanded { border-color: var(--neon-cyan); box-shadow: 0 6px 20px var(--course-shadow); }
.glossary-item-term { display: flex; justify-content: space-between; align-items: center; gap: 12px; user-select: none; }
.glossary-item-title-wrap { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.glossary-item-name { font-size: 1.05rem; font-weight: 700; color: var(--neon-cyan); }
.glossary-toggle-icon { color: var(--course-muted); font-size: 0.85rem; transition: transform 0.3s ease, color 0.2s ease; flex-shrink: 0; }
.glossary-item.expanded .glossary-toggle-icon { transform: rotate(180deg); color: var(--neon-cyan); }
.glossary-item-origin { font-size: 0.7rem; color: var(--neon-yellow); background: var(--course-gold-bg); padding: 2px 8px; border-radius: 4px; font-weight: 600; }
.glossary-item-def {
    font-size: 0.92rem;
    color: var(--course-text);
    line-height: 1.6;
    display: none;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--course-border);
    animation: fadeInDef 0.25s ease;
}
.glossary-item.expanded .glossary-item-def { display: block; }
@keyframes fadeInDef {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Rendering differito: il browser salta layout/paint degli elementi fuori schermo */
.glossary-section { content-visibility: auto; contain-intrinsic-size: auto 4000px; }
.glossary-item { content-visibility: auto; contain-intrinsic-size: auto 90px; }

@media (max-width: 768px) {
    .lesson-card { padding: 24px; }
    .lesson-title { font-size: 1.45rem; }
    .course-toc { padding: 20px; }
    .glossary-tooltip { max-width: 250px; }
    .glossary-actions { flex-direction: column; align-items: stretch; }
    .glossary-toggle-buttons { justify-content: center; }
}