/* mobile */
@import url("mobile.css") only screen and (max-width:480px);

/* tablet */
@import url("tablet.css") only screen and (min-width:481px) and (max-width:767px);

/* screen */
@import url("screen.css") only screen and (min-width:768px) and (max-width:1400px);

/* bigScreen */
@import url("bigScreen.css") only screen and (min-width:1400px);