diff --git a/v3.css b/v3.css
index 27e78446..8be5b3f8 100644
--- a/v3.css
+++ b/v3.css
@@ -130,45 +130,91 @@
 }
 
 @font-face {
-  font-family: 'Cabin Condensed';
-  font-style: normal;
-  font-weight: 600;
-  font-display: swap;
-  src: local('Cabin Condensed SemiBold'), local('CabinCondensed-SemiBold'), url('https://martinthomson.github.io/rfc-css/fonts/cabincondensed-semibold-vietnamese.woff2') format('woff2');
-  unicode-range: U+0102-0103, U+0110-0111, U+1EA0-1EF9, U+20AB;
-}
-@font-face {
-  font-family: 'Cabin Condensed';
+  font-family: 'Oxygen Mono';
   font-style: normal;
-  font-weight: 600;
+  font-weight: 400;
   font-display: swap;
-  src: local('Cabin Condensed SemiBold'), local('CabinCondensed-SemiBold'), url('https://martinthomson.github.io/rfc-css/fonts/cabincondensed-semibold-latin-ext.woff2') format('woff2');
+  src: local('Oxygen Mono'), local('OxygenMono-Regular'), url('https://martinthomson.github.io/rfc-css/fonts/oxygenmono-regular-latin-ext.woff2') format('woff2');
   unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
 }
 @font-face {
-  font-family: 'Cabin Condensed';
+  font-family: 'Oxygen Mono';
   font-style: normal;
-  font-weight: 600;
+  font-weight: 400;
   font-display: swap;
-  src: local('Cabin Condensed SemiBold'), local('CabinCondensed-SemiBold'), url('https://martinthomson.github.io/rfc-css/fonts/cabincondensed-semibold-latin.woff2') format('woff2');
+  src: local('Oxygen Mono'), local('OxygenMono-Regular'), url('https://martinthomson.github.io/rfc-css/fonts/oxygenmono-regular-latin.woff2') format('woff2');
   unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
 }
 
 @font-face {
-  font-family: 'Oxygen Mono';
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: italic;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-italic-cyrillic-ext.woff2') format('woff2');
+  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: italic;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-italic-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: italic;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-italic-greek.woff2') format('woff2');
+  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: italic;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-italic-latin-ext.woff2') format('woff2');
+  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: italic;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-italic-latin.woff2') format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
   font-style: normal;
-  font-weight: 400;
-  font-display: swap;
-  src: local('Oxygen Mono'), local('OxygenMono-Regular'), url('https://martinthomson.github.io/rfc-css/fonts/oxygenmono-regular-latin-ext.woff2') format('woff2');
-  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-regular-cyrillic-ext.woff2') format('woff2');
+  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
 }
 @font-face {
-  font-family: 'Oxygen Mono';
+  font-family: 'Sofia Sans Semi Condensed';
   font-style: normal;
-  font-weight: 400;
-  font-display: swap;
-  src: local('Oxygen Mono'), local('OxygenMono-Regular'), url('https://martinthomson.github.io/rfc-css/fonts/oxygenmono-regular-latin.woff2') format('woff2');
-  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-regular-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: normal;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-regular-greek.woff2') format('woff2');
+  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: normal;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-regular-latin-ext.woff2') format('woff2');
+  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+@font-face {
+  font-family: 'Sofia Sans Semi Condensed';
+  font-style: normal;
+  font-weight: 1 1000;
+  src: url('https://martinthomson.github.io/rfc-css/fonts/sofiasanssemicondensed-regular-latin.woff2') format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
 }
 
 :root {
@@ -201,8 +247,8 @@ body {
 
 /* headings */
 h1, h2, h3, h4, h5, h6 {
-  font-family: "Cabin Condensed", sans-serif;
-  font-weight: 600;
+  font-family: "Sofia Sans Semi Condensed", sans-serif;
+  font-weight: 680;
   margin: 0.8em 0 0.3em;
   font-size-adjust: 0.5;
   color: var(--title-color);