/* =========================================================================
   RAFFAELE BORRELLI — STILE CONDIVISO (Corsi / Dettaglio Corso)
   Riusa le stesse variabili, colori e componenti già presenti in index.html
   per garantire coerenza visiva su tutto il sito.
   ========================================================================= */

/* PALETTE COLORE .NET/C# - stessa di index.html */
:root {
    --primary-color: #512BD4;   /* Deep Purple (.NET/C# theme) */
    --accent-color: #00bcf2;    /* Bright Blue Accent */
    --background-white: #fff;
    --dark-color: #2c2c2c;
    --light-color: #fff;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--background-white);
    color: var(--dark-color);
}

a {
    color: inherit;
}

/* ============ HEADER ============ */
header {
    background: var(--primary-color);
    color: var(--light-color);
    padding: 3rem 0;
    text-align: center;
    position: relative;
}

header h1 {
    margin: 0 0 0.7rem 0;
    font-size: 3rem;
}

header p {
    font-size: 1.5rem;
    font-weight: 300;
    margin: 0;
}

header .breadcrumb {
    display: inline-block;
    margin-top: 1.5rem;
    color: var(--light-color);
    opacity: 0.85;
    text-decoration: none;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    transition: opacity 0.2s;
}

header .breadcrumb:hover {
    opacity: 1;
}

/* ============ NAVIGAZIONE ============ */
nav {
    background: var(--dark-color);
    color: var(--light-color);
    padding: 0.8rem 0;
}

nav ul {
    list-style: none;
    padding: 0 15px;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 25px;
}

nav ul li a {
    color: var(--light-color);
    text-decoration: none;
    font-weight: 400;
    font-size: 1.1rem;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--accent-color);
}

/* ============ LAYOUT DI BASE ============ */
section {
    padding: 60px 20px;
    margin: auto;
    max-width: 1100px;
}

h2 {
    color: var(--primary-color);
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 30px;
    font-weight: 700;
}

.section-intro {
    max-width: 760px;
    margin: 0 auto 40px auto;
    text-align: center;
    color: var(--dark-color);
    font-size: 1.1rem;
}

/* ============ BOTTONI ============ */
.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    font-weight: 700;
    text-decoration: none;
    padding: 12px 28px;
    border-radius: 30px;
    box-shadow: 0 6px 16px rgba(81, 43, 212, 0.3);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 22px rgba(81, 43, 212, 0.4);
}

/* ============ GRID CORSI ============ */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 35px;
    margin-top: 40px;
}

/*
  ============================================================
  BLOCCO "CARD CORSO" — DUPLICABILE
  Per aggiungere un nuovo corso in corsi.html, copia l'intero
  blocco <article class="course-card"> ... </article> e
  modifica titolo, descrizione e link "Vedi lezioni".
  ============================================================
*/
.course-card {
    background: #fff;
    border-radius: 18px;
    padding: 35px 30px;
    box-shadow: 0 6px 20px rgba(81, 43, 212, 0.12);
    border: 2px solid transparent;
    border-top: 4px solid var(--primary-color);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(81, 43, 212, 0.22);
    border-color: var(--accent-color);
}

.course-card .course-tag {
    display: inline-block;
    align-self: flex-start;
    background: rgba(81, 43, 212, 0.08);
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 18px;
}

.course-card h3 {
    color: var(--dark-color);
    font-size: 1.5rem;
    margin: 0 0 14px 0;
}

.course-card p {
    color: #555;
    flex-grow: 1;
    margin: 0 0 24px 0;
}

.course-card .btn-primary {
    align-self: flex-start;
}

/* ============ ACCORDION MODULI ============ */
.modules-list {
    display: flex;
    flex-direction: column;
    gap: 22px;
    margin-top: 40px;
}

/*
  Blocco "modulo" duplicabile: <details class="module-accordion">.
  Usa gli elementi nativi <details>/<summary> per accessibilità e
  funzionamento senza JavaScript (apertura/chiusura, focus da tastiera).
*/
.module-accordion {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 6px 20px rgba(81, 43, 212, 0.12);
    border: 2px solid transparent;
    border-top: 4px solid var(--primary-color);
    overflow: hidden;
    transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.module-accordion[open] {
    box-shadow: 0 12px 30px rgba(81, 43, 212, 0.2);
    border-color: var(--accent-color);
}

.module-header {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    padding: 24px 28px;
    user-select: none;
}

.module-header::-webkit-details-marker {
    display: none;
}

.module-header:hover {
    background: rgba(81, 43, 212, 0.04);
}

.module-tag {
    flex-shrink: 0;
    background: rgba(81, 43, 212, 0.08);
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 6px 14px;
    border-radius: 20px;
}

.module-title {
    flex: 1 1 260px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.module-name {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--dark-color);
}

.module-summary {
    font-size: 0.95rem;
    color: #666;
    font-weight: 400;
}

.module-count {
    flex-shrink: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.9rem;
    white-space: nowrap;
}

.module-chevron {
    flex-shrink: 0;
    font-size: 1.3rem;
    color: var(--accent-color);
    transition: transform 0.25s ease;
}

.module-accordion[open] .module-chevron {
    transform: rotate(180deg);
}

.module-accordion .lessons-list {
    padding: 0 28px 28px 28px;
    margin-top: 0;
    border-top: 1px solid #eee;
    padding-top: 24px;
}

/* Placeholder per moduli non ancora pubblicati */
.module-accordion.module-upcoming {
    opacity: 0.6;
    border-top-color: #ccc;
}

/* ============ LISTA LEZIONI ============ */
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-top: 40px;
}

/*
  ============================================================
  BLOCCO "CARD LEZIONE" — DUPLICABILE
  Per aggiungere una nuova lezione in dettaglio-corso.html,
  copia l'intero blocco <article class="lesson-card"> ... </article>
  e aggiorna numero, titolo e sommario.
  ============================================================
*/
.lesson-card {
    display: flex;
    gap: 25px;
    align-items: flex-start;
    background: #fff;
    border-radius: 18px;
    padding: 28px 30px;
    box-shadow: 0 6px 20px rgba(81, 43, 212, 0.10);
    border: 2px solid transparent;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 26px rgba(81, 43, 212, 0.18);
    border-color: var(--accent-color);
}

.lesson-card .lesson-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    font-weight: 700;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lesson-card .lesson-content h3 {
    margin: 0 0 8px 0;
    font-size: 1.3rem;
    color: var(--dark-color);
}

.lesson-card .lesson-content .lesson-meta {
    display: block;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 6px;
}

.lesson-card .lesson-content p {
    margin: 0;
    color: #555;
}

/* Placeholder per lezioni non ancora pubblicate */
.lesson-card.lesson-upcoming {
    opacity: 0.6;
    border-style: dashed;
    border-color: #ccc;
}

.lesson-card.lesson-upcoming .lesson-number {
    background: #ccc;
}

/* ============ CTA RICHIEDI INFO (email) ============ */
#richiedi-info {
    padding-top: 10px;
}

.info-cta {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    background: linear-gradient(135deg, rgba(81, 43, 212, 0.06), rgba(0, 188, 242, 0.06));
    border-top: 4px solid var(--accent-color);
    border-bottom: 4px solid var(--accent-color);
    border-radius: 18px;
    padding: 45px 35px;
}

.info-cta h2 {
    border-bottom: none;
    display: inline-block;
    margin-bottom: 15px;
}

.info-cta .section-intro {
    margin-bottom: 30px;
}

/* ============ FOOTER ============ */
footer {
    text-align: center;
    padding: 20px;
    background-color: var(--dark-color);
    color: var(--light-color);
    font-size: 0.9rem;
}

/* =========================================================================
   RESPONSIVE
   ========================================================================= */
@media (max-width: 900px) {
    section {
        padding: 45px 20px;
    }

    header h1 {
        font-size: 2.5rem;
    }

    header p {
        font-size: 1.25rem;
    }
}

@media (max-width: 600px) {
    header {
        padding: 2rem 0 1.5rem 0;
    }

    header h1 {
        font-size: 1.9rem;
        margin: 0 0 0.5rem 0;
    }

    header p {
        font-size: 1rem;
        padding: 0 15px;
    }

    nav ul li a {
        font-size: 0.95rem;
    }

    section {
        padding: 35px 15px;
    }

    h2 {
        font-size: 1.5rem;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .course-card {
        padding: 28px 22px;
    }

    .module-header {
        padding: 18px 20px;
        gap: 10px;
    }

    .module-name {
        font-size: 1.1rem;
    }

    .module-summary {
        font-size: 0.88rem;
    }

    .module-accordion .lessons-list {
        padding: 20px 18px 22px 18px;
    }

    .lesson-card {
        flex-direction: column;
        gap: 14px;
        padding: 22px 20px;
    }

    .lesson-card .lesson-number {
        width: 46px;
        height: 46px;
        font-size: 1.1rem;
    }

    .info-cta {
        padding: 32px 20px;
    }

    footer {
        font-size: 0.8rem;
        padding: 18px 12px;
    }
}

@media (max-width: 380px) {
    header h1 {
        font-size: 1.6rem;
    }
}