app/less/font.less
/* From http://fonts.googleapis.com/css?family=Open+Sans:400&subset=latin,cyrillic */

/* cyrillic */
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(../fonts/400cn.woff2) format('woff2');
  unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* latin */
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(../fonts/400ln.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215, U+E0FF, U+EFFD, U+F000;
}

/* cyrillic */
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(../fonts/600cn.woff2) format('woff2');
  unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* latin */
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(../fonts/600ln.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215, U+E0FF, U+EFFD, U+F000;
}

@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400;
  src: local('Open Sans'), local('OpenSans'), url(../fonts/400.woff2) format('woff2'), url(../fonts/400.woff) format('woff'), url(../fonts/400.ttf) format('truetype'), url(../fonts/400.svg#OpenSans) format('svg');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 600;
  src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(../fonts/600.woff2) format('woff2'), url(../fonts/600.woff) format('woff'), url(../fonts/600.ttf) format('truetype'), url(../fonts/600.svg#OpenSans) format('svg');
}