/* =========================
   RÉGLAGES GÉNÉRAUX
   ========================= */
* {
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #222;
}

/* =========================
   MISE EN PAGE DES COURS (DESKTOP)
   ========================= */

.container {
    display: flex;
    min-height: 600px;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
    margin-top: 20px;
    background: #fff;
}

/* Colonne de gauche : menu */
.menu {
    width: 220px;
    background: #f3f3f3;
    border-right: 1px solid #ccc;
}

.menutitle {
    background-color: #000;
    color: #fff;
    text-align: center;
    padding: 12px 8px;
    font-weight: bold;
}

.menu a {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
    border-bottom: 1px solid #ddd;
    font-size: 0.95rem;
}

.menu a:hover,
.menu a.active {
    background: #0078ff;
    color: #fff;
}

/* Colonne de droite : contenu du cours */
.content {
    flex: 1;
    padding: 20px 40px;
    overflow-y: auto;
    box-sizing: border-box;
}

header {
    color: #000;
    padding: 1.5rem 1rem 0.5rem;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

main {
    max-width: 1000px;
    margin: 1.5rem auto 2rem;
    padding: 0 0 1rem;
}

h1 {
    margin-top: 0;
}

/* =========================
   BLOC INTRO ET EXERCICES
   ========================= */

.intro {
    background: #ffffff;
    padding: 1rem 1.2rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.intro p {
    margin: 0.2rem 0;
}

.exercices {
    display: block;
}

.exercice {
    width: 100%;
    background: #ffffff;
    border-radius: 10px;
    padding: 1.2rem 1.4rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    border-top: 4px solid #3949ab;
    margin-bottom: 2rem;
}

.exercice h2 {
    margin-top: 0;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.exercice h3 {
    margin-top: 0.2rem;
    font-weight: 400;
    color: #555;
    font-size: 0.95rem;
}

.exercice ol {
    padding-left: 1.2rem;
    margin: 0.6rem 0 0;
}

.exercice li {
    margin-bottom: 0.4rem;
}

/* Liens & notes */
a {
    color: #3949ab;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

.note {
    font-size: 0.9rem;
    color: #555;
    margin-top: 0.4rem;
}

/* =========================
   VERSION MOBILE
   ========================= */

@media (max-width: 768px) {

    .container {
        flex-direction: column;   /* menu puis contenu */
        min-height: auto;
        margin-top: 10px;
        border-radius: 0;
    }

    .menu {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #ccc;
    }

    .menutitle {
        width: 100%;
        padding: 10px;
        font-size: 0.95rem;
    }

    .menu a {
        width: 100%;
        padding: 10px 12px;
        font-size: 0.95rem;
        text-align: left;
        border-right: none;
    }

    .menu a:last-child {
        border-bottom: none;
    }

    .content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 16px 12px;
    }

    header {
        padding: 1rem 0.5rem 0.5rem;
    }

    header h1 {
        font-size: 1.4rem;
    }

    main {
        max-width: 100%;
        margin: 1rem 0 1.5rem;
        padding: 0;
    }

    .exercice {
        padding: 1rem;
        margin-bottom: 1.2rem;
    }
}