/* =================== SPINNER SYSTEM - VERSION OPTIMISÉE =================== */

        /* Bouton de soumission */
       .submit-button {
        padding: 7px;
        font-size: 1rem;
        font-weight: 400;
        background: linear-gradient(135deg, #F26522 0%, #FF8A50 100%);
        color: white;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
        letter-spacing: 0.5px;
    }

    .submit-button::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        transition: left 0.6s ease;
    }

    .submit-button:hover::before {
        left: 100%;
    }

    .submit-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(242, 101, 34, 0.4);
    }

    .submit-button:active {
        transform: translateY(0);
    }

        /* Texte du bouton */
    .btn-text {
        transition: opacity 0.2s ease;
    }

    /* Spinner */
    .btn-spinner {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        width: 20px;
        height: 20px;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-top: 2px solid #ffffff;
        border-radius: 50%;
        animation: spin 1s linear infinite;
        opacity: 0;
        transition: opacity 0.2s ease;
    }

    /* États du bouton */
    .submit-button.loading .btn-text {
        opacity: 0;
    }

    .submit-button.loading .btn-spinner {
        opacity: 1;
    }

    /* Animation du spinner */
    @keyframes spin {
        0% { transform: translate(-50%, -50%) rotate(0deg); }
        100% { transform: translate(-50%, -50%) rotate(360deg); }
    }