@import url(base.css); 
@import url(pc.css) screen and (min-width: 860px); /* 769以上 */
@import url(tablet.css) screen and (min-width: 561px) and (max-width: 859px); /* 768以下 */
@import url(sp.css) screen and (max-width: 560px); /* 480以下 */

/*
@import url(pc.css) screen and (min-width: 860px); 
@import url(tablet.css) screen and (max-width: 859px); 
@import url(sp.css) screen and (max-width: 560px); 
@import url(smart.css) screen and (max-width: 320px); 
*/