body {
    background: rgba(0, 0, 0, 0) url(../img/fondo_login_calibraciones.jpg) no-repeat fixed center center / cover;
    height: 100%;

}
.btn{border-radius: 5px;}
.login {
    min-height: 100vh; /* hace que el contenedor ocupe toda la altura de la pantalla */
    display: flex;
    align-items: center;
    justify-content: center;
}
.input-group-text{border:none; border-radius: 0px;}
.login .btn{font-size: 0.9em!important;}
.login .tit_entrada {
    color: #000;
    font-size:clamp(1.5rem, 1.65em, 1.875rem);
    font-weight: 500;
}

.login .zona_transp {
    background-color: rgba(249, 248, 244, 0.8);
    border-radius:10px;
    padding: 30px;
    text-align: center;
    backdrop-filter: blur(5px); /* efecto de fondo difuminado */
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}
.login  .btn{text-transform: uppercase; font-weight: 400; letter-spacing: 1px!important; font-size: 0.8em !important;}

.login input::placeholder  { text-transform: uppercase; font-size: 0.8em;}

/*------------------ login_input: campos modernos (formularios de login/registro) ------------------*/
.login_input {
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 50px;
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.login_input:focus-within {
    border-color: #2098d1;
    box-shadow: 0 0 0 3px rgba(32, 152, 209, 0.15);
}

.login_input .form-control:focus {
    box-shadow: none;
}

/* variante input-group (icono + campo), ej. login, recuperar contraseña */
.login_input.input-group .input-group-text {
    background-color: transparent;
    border: none;
    color: #2098d1;
    padding: 0.575rem 0.4rem 0.575rem 1.1rem;
}

.login_input.input-group .form-control {
    border: none;
    background-color: transparent;
    box-shadow: none;
    padding: 0.575rem 1.1rem 0.575rem 0.3rem;
}