* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f4f7fc;
    color: #1e2a3a;
    line-height: 1.5;
    padding: 12px;
}
header, footer {
    background: white;
    border-radius: 20px;
    padding: 15px;
    margin-bottom: 20px;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}
h1 {
    font-size: 1.6rem;
    color: #0f4c5f;
}
.btn-chat, .btn-pdf, .video-link {
    display: inline-block;
    background: #e67e22;
    color: white;
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 40px;
    font-weight: bold;
    margin: 5px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    text-align: center;
}
.btn-chat:hover, .btn-pdf:hover, .video-link:hover {
    background: #b45f1b;
}
.sequence {
    background: white;
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.sequence h2 {
    color: #0f4c5f;
    border-left: 5px solid #ffb74d;
    padding-left: 12px;
    margin-bottom: 12px;
    font-size: 1.3rem;
}
.desc {
    color: #2c3e50;
    margin-bottom: 20px;
    font-style: italic;
}
.ressources {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}
.carte-ressource {
    flex: 1 1 280px;
    background: #fef9e8;
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}
.carte-ressource:hover {
    transform: translateY(-3px);
}
.carte-ressource h3 {
    color: #e67e22;
    margin-bottom: 12px;
    font-size: 1.2rem;
}
/* Iframe YouTube responsive */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* ratio 16/9 */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: 12px;
}
.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
/* Lien YouTube sous la vidéo */
.video-link {
    display: inline-block;
    background: #2c3e50;
    margin-top: 0;
    font-size: 0.85rem;
    padding: 6px 12px;
}
.video-link:hover {
    background: #e67e22;
}
.btn-pdf {
    background: #2c3e50;
}
.btn-pdf:hover {
    background: #e67e22;
}
/* Quiz card responsive */
.quiz-card {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
}
.quiz-content {
    flex: 2;
    min-width: 180px;
}
.top5 {
    flex: 1;
    min-width: 140px;
    background: #f0f0f0;
    border-radius: 12px;
    padding: 12px;
    margin-left: 15px;
    font-size: 0.85rem;
}
.top5 ol {
    margin-left: 20px;
    margin-top: 5px;
}
.historique-link {
    display: inline-block;
    margin-top: 10px;
    font-size: 0.8rem;
    color: #0f4c5f;
}
/* Responsive mobile */
@media (max-width: 720px) {
    body {
        padding: 8px;
    }
    .sequence {
        padding: 15px;
    }
    .carte-ressource {
        flex: 1 1 100%;
    }
    .quiz-card {
        flex-direction: column;
    }
    .top5 {
        margin-left: 0;
        margin-top: 15px;
        width: 100%;
    }
    .btn-chat, .btn-pdf, .video-link {
        padding: 8px 14px;
        font-size: 0.85rem;
    }
    h1 {
        font-size: 1.4rem;
    }
    .sequence h2 {
        font-size: 1.2rem;
    }
}
button, a, .btn-chat, .btn-pdf, .video-link {
    touch-action: manipulation;
}