/* phone */
@import url("phone.css") only screen and (max-width:480px);
/* tablet 1 */
@import url("tablet_1.css") only screen and (min-width:481px) and (max-width:768px);
/* tablet 2 */
@import url("tablet_2.css") only screen and (min-width:769px) and (max-width:1024px);
/* desktop */
@import url("desktop.css") only screen and (min-width:1025px);