/* Charte Graphique : Élégante et Chaleureuse */
:root {
    --primary-blue: #2c3e50;
    --accent-amber: #f39c12;
    --soft-bg: #fdfefe;
    --text-dark: #34495e;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #f4f7f6;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 40px 20px;
    text-align: center;
    border-bottom: 5px solid var(--accent-amber);
}

h1 { margin: 0; font-size: 1.8rem; }
h2 { color: var(--primary-blue); border-left: 5px solid var(--accent-amber); padding-left: 15px; margin-top: 40px; }
h3 { color: var(--accent-amber); margin-top: 25px; }

.intro-card {
    background: var(--white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-top: -30px;
    border-top: 3px solid var(--accent-amber);
}

.session-card {
    background: var(--white);
    margin: 30px 0;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-left: 1px solid #ddd;
}

.badge {
    display: inline-block;
    background: var(--primary-blue);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.benefits {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    background: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.benefit-box strong { color: var(--primary-blue); display: block; margin-bottom: 5px; }

footer {
    text-align: center;
    padding: 40px;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Adaptabilité Mobile */
@media (max-width: 600px) {
    .benefits { grid-template-columns: 1fr; }
    h1 { font-size: 1.4rem; }
}

summary {
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    color: var(--primary-blue);
    list-style: none;
    border: 1px solid #eee;
    transition: all 0.3s ease;
}

summary:hover {
    background-color: #edf2f7;
    color: var(--accent-amber);
}

details {
    margin-bottom: 15px;
    border-radius: 5px;
    overflow: hidden;
}

details[open] summary {
    border-bottom: 2px solid var(--accent-amber);
    margin-bottom: 10px;
}

.detailed-content {
    padding: 15px 25px;
    background: #fff;
    border-left: 3px solid var(--accent-amber);
    font-size: 0.95rem;
}

.teacher-note {
    background: #fff3cd;
    border-radius: 5px;
    padding: 15px;
    margin: 15px 0;
    font-style: italic;
    border-left: 4px solid #ffeeba;
}

/* Bouton de navigation flottant */
.back-to-index {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--primary-blue);
    color: var(--white);
    text-decoration: none;
    padding: 12px 20px;
    border-radius: 50px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    z-index: 1000;
    display: flex;
    align-items: center;
    font-weight: bold;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 2px solid var(--accent-amber);
}

.back-to-index:hover {
    background-color: var(--accent-amber);
    color: var(--primary-blue);
    transform: translateY(-5px);
}

.back-to-index svg {
    margin-right: 8px;
    fill: currentColor;
}

/* Ajustement pour mobile pour ne pas gêner la lecture */
@media (max-width: 600px) {
    .back-to-index {
        bottom: 20px;
        right: 20px;
        padding: 10px 15px;
        font-size: 0.8rem;
    }
}

.valise-link {
    display: block;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    padding: 8px 12px;
    margin: 5px 0;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--primary-blue) !important;
    transition: all 0.2s ease;
}

.valise-link:hover {
    background: var(--primary-blue);
    color: white !important;
    transform: translateX(5px);
}

.valise-link strong {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--accent-amber);
}

.valise-link:hover strong {
    color: white;
}