* { box-sizing: border-box; }

body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    font-size: 2.5rem;
}

/* ITEM */
details {
    background: white;
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* QUESTION */
summary {
    padding: 24px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #2c3e50;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

summary:hover {
    background: #f8f9fa;
}

/* supprimer flèche native */
summary::-webkit-details-marker {
    display: none;
}

/* flèche custom */
summary::after {
    content: "▼";
    font-size: 0.8rem;
    color: #667eea;
    transition: transform 0.3s;
}

/* rotation flèche */
details[open] summary::after {
    transform: rotate(180deg);
}

/* CONTENU */
.faq-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 24px;
    color: #555;
    line-height: 1.6;
    transition: max-height 0.4s ease, padding 0.3s ease;
}

/* animation ouverture */
details[open] .faq-content {
    max-height: 300px;
    padding: 0 24px 24px;
}