diff --git a/src/client/theme-default/components/VPHero.vue b/src/client/theme-default/components/VPHero.vue
index 4e1e2e9b083e..8c390bce119e 100644
--- a/src/client/theme-default/components/VPHero.vue
+++ b/src/client/theme-default/components/VPHero.vue
@@ -140,6 +140,11 @@ const { heroImageSlotExists } = inject(layoutInfoInjectionKey)!
   font-size: 32px;
   font-weight: 700;
   white-space: pre-wrap;
+
+  &:lang(ja) {
+    font-feature-settings: 'palt';
+    word-break: auto-phrase;
+  }
 }
 
 .VPHero.has-image .name,
diff --git a/src/client/theme-default/styles/base.css b/src/client/theme-default/styles/base.css
index 8041b6bc37a2..2502c6ab3b94 100644
--- a/src/client/theme-default/styles/base.css
+++ b/src/client/theme-default/styles/base.css
@@ -237,6 +237,10 @@ p {
   overflow-wrap: break-word;
 }
 
+:where(:lang(zh), :lang(ja), :lang(ko)) {
+  line-break: strict;
+}
+
 vite-error-overlay {
   z-index: 9999;
 }
diff --git a/src/client/theme-default/styles/fonts.css b/src/client/theme-default/styles/fonts.css
index 2e5521c0b46d..d2acfbfd5522 100644
--- a/src/client/theme-default/styles/fonts.css
+++ b/src/client/theme-default/styles/fonts.css
@@ -148,48 +148,319 @@
     U+2212, U+2215, U+FEFF, U+FFFD;
 }
 
+/*
+Some code points in Inter are not compatible with CJK languages.
+
+https://www.unicode.org/L2/L2014/14006-sv-western-vs-cjk.pdf
+https://www.unicode.org/L2/L2018/18013-svs-proposal.pdf
+https://www.unicode.org/L2/L2018/18073-svs-proposal.pdf
+https://www.unicode.org/L2/L2023/23212r-quotes-svs-proposal.pdf
+
+https://github.com/w3c/clreq/blob/f837ffe4a5501e72c17bd02961ce1b440916624f/local.css#L4
+& U+2015 (similar to U+2014 in Japanese)
+
+All CJK languages: U+00B7, U+2013, U+2014, U+2015, U+2018, U+2019, U+201C, U+201D, U+2026, U+2E3A
+zh only: U+007E, U+002F
+*/
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-cyrillic-ext.woff2') format('woff2');
+  unicode-range:
+    U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-greek-ext.woff2') format('woff2');
+  unicode-range: U+1F00-1FFF;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-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: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-vietnamese.woff2') format('woff2');
+  unicode-range:
+    U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1,
+    U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
+    U+1EA0-1EF9, U+20AB;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-latin-ext.woff2') format('woff2');
+  unicode-range:
+    U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
+    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+
+/* Exclude some ambiguous CJK characters. */
+@font-face {
+  font-family: Inter4CJK;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-latin.woff2') format('woff2');
+  unicode-range:
+    U+0000-00B6, U+00B8-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
+    U+02DC, U+0304, U+0308, U+0329, U+2000-2012, U+2016-2017, U+201A-201B,
+    U+201E-2025, U+2027-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212,
+    U+2215, U+FEFF, U+FFFD;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-cyrillic-ext.woff2') format('woff2');
+  unicode-range:
+    U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-greek-ext.woff2') format('woff2');
+  unicode-range: U+1F00-1FFF;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-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: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-vietnamese.woff2') format('woff2');
+  unicode-range:
+    U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1,
+    U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
+    U+1EA0-1EF9, U+20AB;
+}
+
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-latin-ext.woff2') format('woff2');
+  unicode-range:
+    U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
+    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+
+/* Exclude some ambiguous CJK characters. */
+@font-face {
+  font-family: Inter4CJK;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-latin.woff2') format('woff2');
+  unicode-range:
+    U+0000-00B6, U+00B8-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
+    U+02DC, U+0304, U+0308, U+0329, U+2000-2012, U+2016-2017, U+201A-201B,
+    U+201E-2025, U+2027-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212,
+    U+2215, U+FEFF, U+FFFD;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-cyrillic-ext.woff2') format('woff2');
+  unicode-range:
+    U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-greek-ext.woff2') format('woff2');
+  unicode-range: U+1F00-1FFF;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-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: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-vietnamese.woff2') format('woff2');
+  unicode-range:
+    U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1,
+    U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
+    U+1EA0-1EF9, U+20AB;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-latin-ext.woff2') format('woff2');
+  unicode-range:
+    U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
+    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
+}
+
+/* Exclude some ambiguous CJK characters. */
+@font-face {
+  font-family: Inter4zh;
+  font-style: normal;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-roman-latin.woff2') format('woff2');
+  unicode-range:
+    U+0000-002E, U+0030-00B6, U+00B8-00FF, U+0131, U+0152-0153, U+02BB-02BC,
+    U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-2012, U+2016-2017,
+    U+201A-201B, U+201E-2025, U+2027-206F, U+2074, U+20AC, U+2122, U+2191,
+    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-cyrillic-ext.woff2') format('woff2');
+  unicode-range:
+    U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-cyrillic.woff2') format('woff2');
+  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
+}
+
 @font-face {
-  font-family: 'Punctuation SC';
-  font-weight: 400;
-  src:
-    local('PingFang SC Regular'), local('Noto Sans CJK SC'),
-    local('Microsoft YaHei');
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-greek-ext.woff2') format('woff2');
+  unicode-range: U+1F00-1FFF;
+}
+
+@font-face {
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-greek.woff2') format('woff2');
   unicode-range:
-    U+201C, U+201D, U+2018, U+2019, U+2E3A, U+2014, U+2013, U+2026, U+00B7,
-    U+007E, U+002F;
+    U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF;
 }
 
 @font-face {
-  font-family: 'Punctuation SC';
-  font-weight: 500;
-  src:
-    local('PingFang SC Medium'), local('Noto Sans CJK SC'),
-    local('Microsoft YaHei');
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-vietnamese.woff2') format('woff2');
   unicode-range:
-    U+201C, U+201D, U+2018, U+2019, U+2E3A, U+2014, U+2013, U+2026, U+00B7,
-    U+007E, U+002F;
+    U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1,
+    U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
+    U+1EA0-1EF9, U+20AB;
 }
 
 @font-face {
-  font-family: 'Punctuation SC';
-  font-weight: 600;
-  src:
-    local('PingFang SC Semibold'), local('Noto Sans CJK SC Bold'),
-    local('Microsoft YaHei Bold');
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-latin-ext.woff2') format('woff2');
   unicode-range:
-    U+201C, U+201D, U+2018, U+2019, U+2E3A, U+2014, U+2013, U+2026, U+00B7,
-    U+007E, U+002F;
+    U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
+    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
 }
 
+/* Exclude some ambiguous CJK characters. */
 @font-face {
-  font-family: 'Punctuation SC';
-  font-weight: 700;
-  src:
-    local('PingFang SC Semibold'), local('Noto Sans CJK SC Bold'),
-    local('Microsoft YaHei Bold');
+  font-family: Inter4zh;
+  font-style: italic;
+  font-weight: 100 900;
+  font-display: swap;
+  src: url('../fonts/inter-italic-latin.woff2') format('woff2');
   unicode-range:
-    U+201C, U+201D, U+2018, U+2019, U+2E3A, U+2014, U+2013, U+2026, U+00B7,
-    U+007E, U+002F;
+    U+0000-002E, U+0030-00B6, U+00B8-00FF, U+0131, U+0152-0153, U+02BB-02BC,
+    U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-2012, U+2016-2017,
+    U+201A-201B, U+201E-2025, U+2027-206F, U+2074, U+20AC, U+2122, U+2191,
+    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
 }
 
 /* Generate the subsetted fonts using: `pyftsubset <file>.woff2 --unicodes="<range>" --output-file="inter-<style>-<subset>.woff2" --flavor=woff2` */
diff --git a/src/client/theme-default/styles/vars.css b/src/client/theme-default/styles/vars.css
index 2a974f25eee3..55db43f759de 100644
--- a/src/client/theme-default/styles/vars.css
+++ b/src/client/theme-default/styles/vars.css
@@ -262,7 +262,7 @@
 
 :root {
   --vp-font-family-base:
-    'Inter', ui-sans-serif, system-ui, sans-serif, 'Apple Color Emoji',
+    'Inter', -apple-system, BlinkMacSystemFont, sans-serif, 'Apple Color Emoji',
     'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
   --vp-font-family-mono:
     ui-monospace, 'Menlo', 'Monaco', 'Consolas', 'Liberation Mono',
@@ -270,9 +270,19 @@
   font-optical-sizing: auto;
 }
 
-:root:where(:lang(zh)) {
+/* :root and [lang] have the same specificity.
+   [lang] covers the case of e.g. <div lang="zh-CN"> in a non-Chinese page.
+*/
+[lang]:where(:lang(zh)) {
   --vp-font-family-base:
-    'Punctuation SC', 'Inter', ui-sans-serif, system-ui, sans-serif,
+    'Inter4zh', -apple-system, BlinkMacSystemFont, sans-serif,
+    'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
+}
+
+/* Korean compatibility is unverified, so application of custom Inter to Korean is pending. */
+[lang]:where(:lang(ja)) {
+  --vp-font-family-base:
+    'Inter4CJK', -apple-system, BlinkMacSystemFont, sans-serif,
     'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
 }