.container {
            max-width: 1200px;
            width: 100%;
        }
        
        .header {
            text-align: center;
            margin-bottom: 60px;
        }
        
        h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            font-weight: 300;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }
        
        .subtitle {
            color: #7f8c8d;
            font-size: 1.1rem;
            font-weight: 400;
        }
        
        .cards-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px;
        }
        
        /* Style 1: Cartes avec icônes minimalistes */
        .card {
            background: white;
            border-radius: 12px;
            width: 390px;
            padding: 30px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, #e74c3c, #e67e22);
        }
        
        .continue::before {
            background: linear-gradient(90deg, #3498db, #2ecc71);
        }
        
        .doctorat::before {
            background: linear-gradient(90deg, #9b59b6, #34495e);
        }
        
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
        }
        
        .icon-container {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
            background: rgba(231, 76, 60, 0.1);
        }
        
        .continue .icon-container {
            background: rgba(52, 152, 219, 0.1);
        }
        
        .doctorat .icon-container {
            background: rgba(155, 89, 182, 0.1);
        }
        
        .card-icon {
            font-size: 2rem;
            color: #e74c3c;
        }
        
        .continue .card-icon {
            color: #3498db;
        }
        
        .doctorat .card-icon {
            color: #9b59b6;
        }
        
        .card-title {
            font-size: 1.6rem;
            margin-bottom: 15px;
            color: #2c3e50;
            font-weight: 600;
        }
        
        .card-text {
            color: #7f8c8d;
            line-height: 1.6;
            margin-bottom: 25px;
        }
        
        .card-list {
            list-style-type: none;
            margin-bottom: 30px;
        }
        
        .card-list li {
            padding: 8px 0;
            color: #5a6c7d;
            display: flex;
            align-items: center;
        }
        
        .card-list li i {
            margin-right: 10px;
            font-size: 0.9rem;
            color: #e74c3c;
        }
        
        .continue .card-list li i {
            color: #3498db;
        }
        
        .doctorat .card-list li i {
            color: #9b59b6;
        }
        
        .card-btn {
            display: inline-block;
            padding: 12px 25px;
            background: transparent;
            color: #e74c3c;
            border: 1.5px solid #e74c3c;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            text-align: center;
        }
        
        .continue .card-btn {
            color: #3498db;
            border-color: #3498db;
        }
        
        .doctorat .card-btn {
            color: #9b59b6;
            border-color: #9b59b6;
        }
        
        .card-btn:hover {
            background: #e74c3c;
            color: white;
            transform: translateY(-2px);
        }
        
        .continue .card-btn:hover {
            background: #3498db;
        }
        
        .doctorat .card-btn:hover {
            background: #9b59b6;
        }
        
        /* Style 2: Cartes avec fonds colorés subtils */
        .card-v2 {
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            border-radius: 16px;
            width: 350px;
            padding: 35px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
            transition: all 0.4s ease;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        
        .card-v2:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
        }
        
        .card-v2 .icon-container {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            margin-bottom: 25px;
            background: rgba(231, 76, 60, 0.15);
        }
        
        .card-v2.continue .icon-container {
            background: rgba(52, 152, 219, 0.15);
        }
        
        .card-v2.doctorat .icon-container {
            background: rgba(155, 89, 182, 0.15);
        }
        
        .card-v2 .card-icon {
            font-size: 1.8rem;
        }
        
        .card-v2 .card-title {
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        
        .card-v2 .card-text {
            margin-bottom: 30px;
        }
        
        .card-v2 .card-list {
            margin-bottom: 35px;
        }
        
        .card-v2 .card-list li {
            padding: 10px 0;
        }
        
        .card-v2 .card-btn {
            border-radius: 8px;
            padding: 14px 30px;
            width: 100%;
            text-align: center;
        }
        
        /* Style 3: Cartes ultra-minimalistes */
        .card-v3 {
            background: white;
            border-radius: 10px;
            width: 320px;
            padding: 30px;
            box-shadow: 0 3px 15px rgba(0, 0, 0, 0.03);
            transition: all 0.3s ease;
            border-left: 4px solid #e74c3c;
        }
        
        .card-v3.continue {
            border-left-color: #3498db;
        }
        
        .card-v3.doctorat {
            border-left-color: #9b59b6;
        }
        
        .card-v3:hover {
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.07);
        }
        
        .card-v3 .icon-container {
            width: 50px;
            height: 50px;
            border-radius: 10px;
            margin-bottom: 20px;
            background: rgba(231, 76, 60, 0.08);
        }
        
        .card-v3.continue .icon-container {
            background: rgba(52, 152, 219, 0.08);
        }
        
        .card-v3.doctorat .icon-container {
            background: rgba(155, 89, 182, 0.08);
        }
        
        .card-v3 .card-icon {
            font-size: 1.5rem;
        }
        
        .card-v3 .card-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
        }
        
        .card-v3 .card-text {
            font-size: 0.95rem;
            margin-bottom: 20px;
        }
        
        .card-v3 .card-list {
            margin-bottom: 25px;
        }
        
        .card-v3 .card-list li {
            padding: 6px 0;
            font-size: 0.9rem;
        }
        
        .card-v3 .card-list li i {
            font-size: 0.8rem;
        }
        
        .card-v3 .card-btn {
            padding: 10px 20px;
            font-size: 0.9rem;
            border-radius: 6px;
        }
        
        /* Responsive */
        @media (max-width: 1100px) {
            .card, .card-v2, .card-v3 {
                width: 300px;
            }
        }
        
        @media (max-width: 768px) {
            .cards-container {
                flex-direction: column;
                align-items: center;
            }
            
            .card, .card-v2, .card-v3 {
                width: 100%;
                max-width: 400px;
            }
            
            h1 {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 480px) {
            .card, .card-v2, .card-v3 {
                padding: 25px;
            }
            
            .icon-container {
                width: 60px;
                height: 60px;
            }
            
            .card-icon {
                font-size: 1.7rem;
            }
        }
        
        /* Sélecteur de style */
        .style-selector {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
            gap: 15px;
            flex-wrap: wrap;
        }
        
        .style-btn {
            padding: 10px 20px;
            background: white;
            border: 1px solid #ddd;
            border-radius: 30px;
            color: #7f8c8d;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .style-btn.active {
            background: #2c3e50;
            color: white;
            border-color: #2c3e50;
        }
        
        .style-section {
            display: none;
        }
        
        .style-section.active {
            display: flex;
        }