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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

details {
    margin: 10px 0;
}

summary {
    cursor: pointer;
    list-style: none; /* Supprime l'icône par défaut */
    position: relative; /* Nécessaire pour positionner l'icône */
    padding-right: 5%; /* Espace pour l'icône */
    padding: 10px 5% 10px 10px;
    border: solid white;
    border-radius : 15px;
    background-color: #F0F0FC;
    font-size: 1.5rem;
    font-weight: bold;
}

summary::before {
    content: url('./chevron.svg'); /* Icône d'ouverture */
    position: absolute;
    left: 95%;
    transition: transform 0.3s; /* Animation pour la rotation */
}

details[open] summary::before {
    transform: rotate(90deg); /* Rotation de l'icône quand ouvert */
    content:  url('./chevron.svg'); /* Icône de fermeture */
}
details[open] summary {
    background-color: white;
}
details[open] > div {
    margin-left:20px;
    color : white;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.btn {
    background: rgba(255,255,255,0.2);
    border: 2px solid rgba(255,255,255,0.3);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn.active {
    background: rgba(255,255,255,0.4);
    border-color: rgba(255,255,255,0.6);
}

.hidden {
    display: none;
}

a {
    color: #F0F0FC;
}

button {
    margin: 2px;
    padding: 5px 20px;
    border-radius : 5px;
}

label {
    font-family: system-ui, sans-serif;
    font-size: 1.2rem;
    font-weight: bold;
    line-height: 1.1;
    display: grid;
    grid-template-columns: 1em auto;
    gap: 0.5em;
}

@media  (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }            
}