body {
 
        background: linear-gradient(135deg, #000000, #6b91fb);
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        margin: 0;
        padding: 20px;
    }

    .login-box {
        background-color: #fff;
        border-radius: 20px;
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
        padding: 30px;
        max-width: 400px;
        width: 100%;
        animation: fade-in 0.5s ease;
    }

    @keyframes fade-in {
        from { opacity: 0; transform: translateY(-20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .login-logo img {
        width: 80px;
        height: 80px;
        object-fit: contain;
        margin-bottom: 15px;
    }

    .login-box-msg {
        font-size: 24px;
        margin-bottom: 30px;
        color: #333;
        text-align: center;
    }

    .form-group {
        margin-bottom: 20px;
        position: relative;
    }

    .form-control {
        border-radius: 10px;
        padding: 10px 15px;
        font-size: 14px;
        border: none;
        background-color: #f2f2f2;
        color: #333;
        transition: background-color 0.3s ease;
    }

    .form-control:focus {
        background-color: #e6e6e6;
        outline: none;
    }

    .form-control-feedback {
        position: absolute;
        top: 50%;
        right: 15px;
        transform: translateY(-50%);
        color: #aaa;
        font-size: 18px;
    }

    .btn-primary {
        background-color: #667eea;
        border-color: #667eea;
        font-size: 16px;
        padding: 10px 25px;
        border-radius: 10px;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .btn-primary::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(255, 255, 255, 0.2);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: -1;
    }

    .btn-primary:hover::before {
        transform: translateX(0);
    }

    .btn-primary:hover {
        background-color: #5469d4;
        border-color: #5469d4;
        transform: translateY(-2px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    .file-input-label {
        display: inline-block;
        padding: 12px 20px;
        background-color: #f2f2f2;
        color: #333;
        border-radius: 10px;
        cursor: pointer;
        transition: background-color 0.3s ease;
        font-size: 16px;
    }

    .file-input-label:hover {
        background-color: #e6e6e6;
    }

    #imagen {
        display: none;
    }

    .error-message {
        color: #dc3545;
        font-size: 0.875em;
        margin-top: 0.25rem;
    }



    .error-message {
        color: #dc3545;
        font-size: 0.875em;
        margin-top: 0.25rem;
    }