body {
        background: #f5f5f5;
        color: #222;
    }

    .background-img {
        background: radial-gradient(circle, rgba(255,255,255,0) 70%, rgba(0,0,0,0.5) 100%);
    }
    
    .logo {
        font-size: 34px;
        font-weight: bold;
        color: #333a79;
    }

    /* Copilot CSS */
    .Mess_accueil {
        background: rgba(255, 254, 254, 0.637);
        padding: 20px;
        border-radius: 12px;
        max-width: 60%;
        backdrop-filter: blur(5px);
        
        overflow: hidden;
        transition:
            transform 0.25s ease,
            box-shadow 0.25s ease,
            background 0.25s ease;
    }

    .Mess_accueil:hover {
        transform: translateY(-2px);
        box-shadow:
            0 15px 25px rgba(0, 0, 0, 0.15);
    }

    .Mess_accueil p {
        margin: 0;
        font-size: 1rem;
        line-height: 1.8;
        color: #050505;
        font-weight: 400;
    }
    /* Fin Copilot CSS */

    .hero {
        text-align: center;
        margin-top: 80px;
        padding: 0 20px;
    }
    
    .hero h1 {
        font-size: 90px;
        font-weight:bolder ;
        color: #050505;
        margin-bottom: 20px;
    }
    
    .hero p {
        font-size: 20px;
        color: #555;
        max-width: 1200px;
        margin: auto;
        line-height: 1.6;
    }
    
    .btn {
        margin-top: 5px;
        padding: 14px 28px;
        border: none;
        background: #333a79;
        color: white;
        font-size: 16px;
        border-radius: 30px;
        cursor: pointer;
        transition: 0.3s;
    }
    
    .btn:hover {
        background: #282d5f;
    }

    .btn:active {
        background: #282d5f;
    }

        
    .details {
        max-width: 700px;
        margin: 25px auto;
        display: none;
        padding: 20px;
        font-size: 14px;
        color: #666;
        background: white;
        border-radius: 12px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.08);
        line-height: 1.6;
    }