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

        body, html {
            height: 100%;
            font-family: Arial, sans-serif;
            background: url("../img/cares authentique.png") no-repeat center center;
            background-size: cover;
            
        }

        .main-container {
            display: flex;
            height: 100vh;
            width: 100%;
            justify-content: center;
            align-items: center;
        }

        .card-container {
            perspective: 1000px;
            width: 400px;
            height: 600px;

        }

        .card {
            width: 100%;
            height: 100%;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.8s;
            background: rgba(47, 85, 54, 0.2);
        }

        .card.flipped {
            transform: rotateY(180deg);
        }

        .front, .back {
            position: absolute;
            width: 100%;
            height: 100%;
            backface-visibility: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            border-radius: 15px;
            background-color: rgba(255, 255, 255, 0.9);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            padding: 20px;
        }

        .back {
            background-color: #f1f1f1;
            transform: rotateY(180deg);
        }

        .left-panel {
            flex: 1;
            background: url("../img/cares authentique.png") no-repeat center center;
            background-size: cover;
            min-height: 100vh;
        }

        .right-panel {
            flex: 1;
            background-color: rgba(127, 230, 146, 0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .blur-box {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 20px;
        }

        .card .social-icons i {
            font-size: 1.5rem;
            margin: 0 10px;
            cursor: pointer;
        }

        .input-group-text {
            background: white;
            border-right: 0;
        }

        .form-control {
            border-left: 0;
        }


        .form-container {
            width: 100%;
            max-width: 400px;
            border-radius: 15px;
            background: rgba(255, 255, 255, 0.9);
            padding: 20px;
        }

        @media (max-width: 768px) {
            .main-container {
                flex-direction: column;
            }

            .left-panel, .right-panel {
                width: 100%;
                min-height: 50vh;
            }
        }
        a{
            color: green;
        }
        .btn-start {
            margin-top: 20px;
            background: transparent;
            padding: 12px 24px;
            border: 2px solid #4caf50;
            border-radius: 8px;
            font-weight: bold;
            font-size: 1rem;
            color: #2e7d32;
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease-in-out;
        }
        .btn-start::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: rgba(4, 252, 12, 0.3);
            transition: all 0.4s ease-in-out;
            z-index: -1;
        }
        btn-start:hover::before {
            left: 0;
        }
        .btn-start:hover {
            color: #2e7d32;
            background-color: rgba(80, 251, 61, 0.3);

        }
        .form-box {
            width: 100%;
            max-width: 400px;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0,0,0,0.1);
        }