iPhone 5 и 5S в portrait & landscape
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px) { /* STYLES GO HERE */}

iPhone 5 и 5S в landscape
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : landscape) { /* STYLES GO HERE */}

iPhone 5 и 5S в portrait
@media only screen
and (min-device-width : 320px)
and (max-device-width : 568px)
and (orientation : portrait) { /* STYLES GO HERE */ }