GCWing · kev1n77 · Sep 9, 2026 · Sep 8, 2026
diff --git a/design-system/apps/design-lab/src/pages/ComponentDetailPage.tsx b/design-system/apps/design-lab/src/pages/ComponentDetailPage.tsx
@@ -817,7 +817,7 @@ export function ComponentDetailPage({
             </DialogHeading>
             <DialogClose />
           </DialogHeader>
-          <DialogBody className="component-dialog-example__body">{renderDialogConfigurationContent()}</DialogBody>
+          <DialogBody>{renderDialogConfigurationContent()}</DialogBody>
           <DialogFooter appearance="floating">
             <Button onClick={closePreview} variant="fill">
               {t("components.preview.modalCancel")}

diff --git a/design-system/apps/design-lab/src/styles.css b/design-system/apps/design-lab/src/styles.css
@@ -3744,11 +3744,6 @@ body,
   min-width: 0;
 }
 
-.component-dialog-example__body {
-  padding-block-end: var(--openbitfun-overlay-dialog-footer-content-inset);
-  scroll-padding-block-end: var(--openbitfun-overlay-dialog-footer-content-inset);
-}
-
 .component-dialog-example__hint {
   margin: 0;
   color: var(--openbitfun-color-content-muted);

diff --git a/design-system/packages/design-tokens/src/system.tokens.json b/design-system/packages/design-tokens/src/system.tokens.json
@@ -263,10 +263,10 @@
       },
       "dialog": {
         "fontFamily": { "$value": "{font.family.sans}" },
-        "fontSize": { "$value": "{font.size.3xl}" },
-        "fontWeight": { "$value": "{font.weight.semibold}" },
-        "lineHeight": { "$value": "{lineHeight.tight}" },
-        "letterSpacing": { "$value": "{letterSpacing.tight}" }
+        "fontSize": { "$value": "{font.size.3xl-plus}" },
+        "fontWeight": { "$value": "{font.weight.bold}" },
+        "lineHeight": { "$value": 1.2083333333 },
+        "letterSpacing": { "$value": "{letterSpacing.normal}" }
       },
       "display": {
         "fontFamily": { "$value": "{font.family.sans}" },

diff --git a/design-system/packages/ui/README.md b/design-system/packages/ui/README.md
@@ -415,3 +415,5 @@ caption color directly, avoiding a second opacity multiplier. The nested-menu
 Pattern includes a scrolling toggle for keyboard and submenu verification.
 
 Compact tabs use `size="sm"` (30px, 14px icons, 4px icon gap); standard tabs retain 40px and 16px icons. Tabs share the outline-button surface contract and keep selection separate from pointer press. `SegmentedControl size="md"` uses a borderless 36px bar with 30px segments, 3px inset, 4px gaps and 12px segment padding. The default `sm` bar keeps its 28px outer height; separate pills retain their existing heights. Mobile controls own their touch geometry independently.
+
+Dialog titles use 24px bold type with their own 29px line box and normal tracking. `DialogHeader` and `DialogFooter` omit separators by default; pass `separator` for a deliberate divider. A direct `DialogBody` sibling of `DialogFooter appearance="floating"` owns the trailing scroll inset automatically. The floating footer provides the 68px centered action area and a masked blur/gradient using the current theme surface; reduced transparency and forced colors use an opaque fallback. Keep scrollable form content inside `DialogBody` instead of adding a second viewport with independent footer spacing.
diff --git a/design-system/packages/ui/src/components/Dialog/Dialog.meta.ts b/design-system/packages/ui/src/components/Dialog/Dialog.meta.ts
@@ -2,17 +2,19 @@ import type { ComponentMeta } from "../../registry.types";
 
 export const dialogMeta = {
   category: "feedback",
-  description: "A compound dialog with attached or opaque floating footer anatomy on the shared overlay kernel.",
+  description: "A compound dialog with attached or frosted floating footer anatomy on the shared overlay kernel.",
   maturity: "stable",
   name: "Dialog",
   props: [
     { name: "open", type: "boolean" },
     { name: "onOpenChange", type: "(open: false, reason: DialogCloseReason) => void" },
     { defaultValue: "md", name: "size", type: "sm | md | lg | xl | 2xl" },
+    { defaultValue: "false", name: "DialogHeader.separator", type: "boolean" },
+    { defaultValue: "false", name: "DialogFooter.separator", type: "boolean" },
     { defaultValue: "true", name: "closeOnEscape", type: "boolean" },
     { defaultValue: "true", name: "closeOnPointerOutside", type: "boolean" },
   ],
-  states: ["default", "open", "alert", "scrolling", "opaque-floating-footer"],
+  states: ["default", "open", "alert", "scrolling", "floating-footer"],
   tokens: [
     "color.overlay.scrim",
     "color.surface.raised",
@@ -27,12 +29,18 @@ export const dialogMeta = {
     "overlay.dialog.footerPaddingBlockStart",
     "overlay.dialog.footerPaddingBlockEnd",
     "overlay.dialog.footerActionMinWidth",
+    "overlay.dialog.footerHeight",
+    "overlay.dialog.footerFadeExtent",
+    "overlay.dialog.footerContentInset",
+    "overlay.dialog.footerBlur",
     "shadow.overlay",
     "motion.distance.sm",
     "type.support",
     "type.heading.dialog.fontFamily",
     "type.heading.dialog.fontSize",
     "type.heading.dialog.fontWeight",
+    "type.heading.dialog.lineHeight",
+    "type.heading.dialog.letterSpacing",
   ],
 } as const satisfies ComponentMeta;
 

diff --git a/design-system/packages/ui/src/components/Dialog/Dialog.module.css b/design-system/packages/ui/src/components/Dialog/Dialog.module.css
@@ -76,6 +76,9 @@
     gap: var(--openbitfun-space-3);
     padding-block: var(--openbitfun-overlay-dialog-header-padding-block-start) var(--openbitfun-overlay-dialog-header-padding-block-end);
     padding-inline: var(--openbitfun-overlay-dialog-header-padding-inline);
+  }
+
+  .header[data-separator="true"] {
     border-block-end: var(--openbitfun-border-width-default) solid var(--openbitfun-color-border-subtle);
   }
 
@@ -95,7 +98,7 @@
     font-family: var(--openbitfun-type-heading-dialog-font-family);
     font-size: var(--openbitfun-type-heading-dialog-font-size);
     font-weight: var(--openbitfun-type-heading-dialog-font-weight);
-    line-height: var(--openbitfun-type-body-sm-line-height);
+    line-height: var(--openbitfun-type-heading-dialog-line-height);
     letter-spacing: var(--openbitfun-type-heading-dialog-letter-spacing);
     white-space: nowrap;
   }
@@ -133,6 +136,15 @@
     padding: var(--openbitfun-overlay-dialog-content-padding-lg);
   }
 
+  .header + .body[data-inset="standard"] {
+    padding-block-start: 0;
+  }
+
+  .surface:has(> .footer[data-appearance="floating"]) > .body {
+    padding-block-end: var(--openbitfun-overlay-dialog-footer-content-inset);
+    scroll-padding-block-end: var(--openbitfun-overlay-dialog-footer-content-inset);
+  }
+
   .footer {
     display: flex;
     flex: 0 0 auto;
@@ -141,6 +153,9 @@
     gap: var(--openbitfun-space-2);
     padding-block: var(--openbitfun-overlay-dialog-footer-padding-block-start) var(--openbitfun-overlay-dialog-footer-padding-block-end);
     padding-inline: var(--openbitfun-overlay-dialog-footer-padding-inline);
+  }
+
+  .footer[data-separator="true"] {
     border-block-start: var(--openbitfun-border-width-default) solid var(--openbitfun-color-border-subtle);
   }
 
@@ -149,11 +164,26 @@
     z-index: var(--openbitfun-layer-content);
     inset-inline: 0;
     inset-block-end: 0;
+    min-block-size: var(--openbitfun-overlay-dialog-footer-height);
     justify-content: center;
-    background: var(--openbitfun-color-surface-raised);
+    isolation: isolate;
+    background: transparent;
     pointer-events: auto;
   }
 
+  .footer[data-appearance="floating"]::before {
+    position: absolute;
+    z-index: -1;
+    inset: 0;
+    inset-block-start: calc(-1 * var(--openbitfun-overlay-dialog-footer-fade-extent));
+    background: linear-gradient(to bottom, transparent, var(--openbitfun-color-surface-raised));
+    -webkit-backdrop-filter: var(--openbitfun-overlay-dialog-footer-blur);
+    backdrop-filter: var(--openbitfun-overlay-dialog-footer-blur);
+    mask-image: linear-gradient(to bottom, transparent, var(--openbitfun-color-surface-raised) var(--openbitfun-overlay-dialog-footer-fade-extent));
+    content: "";
+    pointer-events: none;
+  }
+
   .footer[data-appearance="floating"] > * {
     min-inline-size: var(--openbitfun-overlay-dialog-footer-action-min-width);
     pointer-events: auto;
@@ -179,4 +209,14 @@
       animation-duration: 1ms;
     }
   }
+
+  @media (forced-colors: active), (prefers-reduced-transparency: reduce) {
+    .footer[data-appearance="floating"]::before {
+      inset-block-start: 0;
+      background: var(--openbitfun-color-surface-raised);
+      -webkit-backdrop-filter: none;
+      backdrop-filter: none;
+      mask-image: none;
+    }
+  }
 }
diff --git a/design-system/packages/ui/src/components/Dialog/Dialog.tsx b/design-system/packages/ui/src/components/Dialog/Dialog.tsx
@@ -209,9 +209,13 @@ export const Sheet = forwardRef<HTMLDivElement, SheetProps>(function Sheet({
   );
 });
 
-export const DialogHeader = forwardRef<HTMLDivElement, HTMLAttributes<HTMLDivElement>>(
-  function DialogHeader({ className, ...props }, ref) {
-    return <header {...props} className={classNames(styles.header, className)} data-openbitfun-part="header" ref={ref} />;
+export interface DialogHeaderProps extends HTMLAttributes<HTMLDivElement> {
+  separator?: boolean;
+}
+
+export const DialogHeader = forwardRef<HTMLDivElement, DialogHeaderProps>(
+  function DialogHeader({ className, separator = false, ...props }, ref) {
+    return <header {...props} className={classNames(styles.header, className)} data-openbitfun-part="header" data-separator={separator} ref={ref} />;
   },
 );
 
@@ -291,15 +295,17 @@ export const DialogBody = forwardRef<HTMLDivElement, DialogBodyProps>(
 
 export interface DialogFooterProps extends HTMLAttributes<HTMLElement> {
   appearance?: DialogFooterAppearance;
+  separator?: boolean;
 }
 
 export const DialogFooter = forwardRef<HTMLElement, DialogFooterProps>(
-  function DialogFooter({ appearance = "attached", className, ...props }, ref) {
+  function DialogFooter({ appearance = "attached", className, separator = false, ...props }, ref) {
     return (
       <footer
         {...props}
         className={classNames(styles.footer, className)}
         data-appearance={appearance}
+        data-separator={separator}
         data-openbitfun-part="footer"
         ref={ref}
       />

diff --git a/design-system/packages/ui/src/components/Dialog/index.ts b/design-system/packages/ui/src/components/Dialog/index.ts
@@ -14,6 +14,7 @@ export {
   type DialogCloseReason,
   type DialogFooterAppearance,
   type DialogFooterProps,
+  type DialogHeaderProps,
   type DialogProps,
   type DialogSize,
   type SheetPlacement,

diff --git a/design-system/packages/ui/src/index.ts b/design-system/packages/ui/src/index.ts
@@ -171,6 +171,9 @@ export {
   type DialogBodyProps,
   type DialogCloseProps,
   type DialogCloseReason,
+  type DialogFooterAppearance,
+  type DialogFooterProps,
+  type DialogHeaderProps,
   type DialogProps,
   type DialogSize,
   type SheetPlacement,

diff --git a/design-system/packages/ui/tests/dialog.test.mjs b/design-system/packages/ui/tests/dialog.test.mjs
@@ -3,7 +3,7 @@ import { createElement } from "react";
 import { renderToStaticMarkup } from "react-dom/server";
 import { readFile } from "node:fs/promises";
 import test from "node:test";
-import { DialogFooter } from "../dist/index.js";
+import { DialogFooter, DialogHeader } from "../dist/index.js";
 
 test("Dialog and Sheet compose the shared overlay kernel and compound anatomy", async () => {
   const source = await readFile(
@@ -69,7 +69,7 @@ test("Dialog geometry and typography use public design tokens", async () => {
   assert.doesNotMatch(styles, /#[0-9a-f]{3,8}/i);
 });
 
-test("DialogFooter exposes a centered opaque floating action layer", async () => {
+test("DialogFooter exposes a centered frosted floating action layer", async () => {
   const markup = renderToStaticMarkup(
     createElement(
       DialogFooter,
@@ -83,8 +83,17 @@ test("DialogFooter exposes a centered opaque floating action layer", async () =>
   assert.match(markup, /data-appearance="floating"/);
   assert.match(styles, /\[data-appearance=floating\]\{[^}]*position:absolute/);
   assert.match(styles, /\[data-appearance=floating\]\{[^}]*justify-content:center/);
-  assert.match(styles, /\[data-appearance=floating\]\{[^}]*background:var\(--openbitfun-color-surface-raised\)/);
-  assert.doesNotMatch(styles, /\[data-appearance=floating\]\{[^}]*background:transparent/);
+  assert.match(styles, /\[data-appearance=floating\]:before\{[^}]*background:linear-gradient/);
+  assert.match(styles, /\[data-appearance=floating\]:before\{[^}]*backdrop-filter:var\(--openbitfun-overlay-dialog-footer-blur\)/);
   assert.match(styles, /\[data-appearance=floating\]\{[^}]*pointer-events:auto/);
   assert.match(styles, /--openbitfun-overlay-dialog-footer-action-min-width/);
 });
+
+test("dialog separators are explicit and do not leak native attributes", () => {
+  for (const component of [DialogHeader, DialogFooter]) {
+    assert.match(renderToStaticMarkup(createElement(component)), /data-separator="false"/);
+    const markup = renderToStaticMarkup(createElement(component, { separator: true }));
+    assert.match(markup, /data-separator="true"/);
+    assert.doesNotMatch(markup, / separator=/);
+  }
+});
diff --git a/design-system/packages/ui/tests/text-clipping.test.mjs b/design-system/packages/ui/tests/text-clipping.test.mjs
@@ -33,7 +33,9 @@ for (const [component, selector] of [
       declarations["line-height"],
       component === "ActionItem"
         ? /^var\(--openbitfun-type-action-row-line-height\)$/
-        : /^var\(--openbitfun-(?:line-height-base|type-body-sm-line-height|type-label-(?:xs|md)-line-height)\)$/,
+        : component === "Dialog"
+          ? /^var\(--openbitfun-type-heading-dialog-line-height\)$/
+          : /^var\(--openbitfun-(?:line-height-base|type-body-sm-line-height|type-label-(?:xs|md)-line-height)\)$/,
     );
     assert.equal(declarations.overflow, "hidden");
     assert.equal(declarations["text-overflow"], undefined);

diff --git a/src/apps/data-migrator/ui/generated/design-system.css b/src/apps/data-migrator/ui/generated/design-system.css
@@ -530,10 +530,10 @@
     --openbitfun-type-heading-compact-page-letter-spacing: var(--openbitfun-letter-spacing-normal);
     --openbitfun-type-heading-compact-page-line-height: var(--openbitfun-line-height-tight);
     --openbitfun-type-heading-dialog-font-family: var(--openbitfun-font-family-sans);
-    --openbitfun-type-heading-dialog-font-size: var(--openbitfun-font-size-3xl);
-    --openbitfun-type-heading-dialog-font-weight: var(--openbitfun-font-weight-semibold);
-    --openbitfun-type-heading-dialog-letter-spacing: var(--openbitfun-letter-spacing-tight);
-    --openbitfun-type-heading-dialog-line-height: var(--openbitfun-line-height-tight);
+    --openbitfun-type-heading-dialog-font-size: var(--openbitfun-font-size-3xl-plus);
+    --openbitfun-type-heading-dialog-font-weight: var(--openbitfun-font-weight-bold);
+    --openbitfun-type-heading-dialog-letter-spacing: var(--openbitfun-letter-spacing-normal);
+    --openbitfun-type-heading-dialog-line-height: 1.2083333333;
     --openbitfun-type-heading-display-font-family: var(--openbitfun-font-family-sans);
     --openbitfun-type-heading-display-font-size: var(--openbitfun-font-size-4xl);
     --openbitfun-type-heading-display-font-weight: var(--openbitfun-font-weight-semibold);
Original file line number	Diff line number	Diff line change
Expand Up		@@ -415,3 +415,5 @@ caption color directly, avoiding a second opacity multiplier. The nested-menu
		Pattern includes a scrolling toggle for keyboard and submenu verification.

		Compact tabs use `size="sm"` (30px, 14px icons, 4px icon gap); standard tabs retain 40px and 16px icons. Tabs share the outline-button surface contract and keep selection separate from pointer press. `SegmentedControl size="md"` uses a borderless 36px bar with 30px segments, 3px inset, 4px gaps and 12px segment padding. The default `sm` bar keeps its 28px outer height; separate pills retain their existing heights. Mobile controls own their touch geometry independently.

		Dialog titles use 24px bold type with their own 29px line box and normal tracking. `DialogHeader` and `DialogFooter` omit separators by default; pass `separator` for a deliberate divider. A direct `DialogBody` sibling of `DialogFooter appearance="floating"` owns the trailing scroll inset automatically. The floating footer provides the 68px centered action area and a masked blur/gradient using the current theme surface; reduced transparency and forced colors use an opaque fallback. Keep scrollable form content inside `DialogBody` instead of adding a second viewport with independent footer spacing.