fix:

1. 修复登录界面文字被遮挡问题 2. 大字模式关闭后显示异常问题 3. 重新调整大字模式是否开启时的字体显示效果
2026-04-10 20:35:57 +08:00
parent abf8497c2e
commit 17b9fa3466
27 changed files with 390 additions and 161 deletions
--- a/app-expo/src/app/(main)/conversation/[id].tsx
+++ b/app-expo/src/app/(main)/conversation/[id].tsx
@@ -960,13 +960,14 @@ export default function ConversationScreen() {
  /** 大字模式：朗读图标与触控区与气泡字号同档放大 */
  const chatReadAloudIconSize = largeText ? 24 : 20;
  const chatReadAloudButtonSize = largeText ? 52 : 44;
-  const chatVoiceDurationStyle = useMemo(
-    () => ({
-      fontSize: largeText ? typography.headingSmall : typography.titleMedium,
+  const chatVoiceDurationStyle = useMemo(() => {
+    const fs = largeText ? typography.headingSmall : typography.titleMedium;
+    return {
+      fontSize: fs,
+      lineHeight: Math.ceil(fs * 1.25),
      fontWeight: '500' as const,
-    }),
-    [typography, largeText],
-  );
+    };
+  }, [typography, largeText]);
  const chatTypingLabelStyle = useMemo(
    () => ({
      fontSize: largeText ? typography.bodySmall : typography.captionLarge,
@@ -977,6 +978,9 @@ export default function ConversationScreen() {
  const headerTitleFontStyle = useMemo(
    () => ({
      fontSize: largeText ? typography.headingMedium : typography.headingSmall,
+      lineHeight: largeText
+        ? Math.ceil(typography.headingMedium * 1.4)
+        : Math.ceil(typography.headingSmall * 1.28),
    }),
    [typography, largeText],
  );
@@ -992,13 +996,14 @@ export default function ConversationScreen() {
    }),
    [typography, inputLineHeight, largeText],
  );
-  const connectionNoticeTitleStyle = useMemo(
-    () => ({
-      fontSize: largeText ? typography.titleSmall : typography.captionLarge,
+  const connectionNoticeTitleStyle = useMemo(() => {
+    const fs = largeText ? typography.titleSmall : typography.captionLarge;
+    return {
+      fontSize: fs,
+      lineHeight: Math.ceil(fs * 1.28),
      fontWeight: '700' as const,
-    }),
-    [typography, largeText],
-  );
+    };
+  }, [typography, largeText]);
  const connectionNoticeBodyStyle = useMemo(
    () => ({
      fontSize: largeText ? typography.bodySmall : typography.captionLarge,
@@ -1401,7 +1406,10 @@ export default function ConversationScreen() {
        variant="chat"
        title={
          <View style={styles.headerTitleBlock}>
-            <Text style={[styles.headerTitle, headerTitleFontStyle]}>
+            <Text
+              style={[styles.headerTitle, headerTitleFontStyle]}
+              includeFontPadding={Platform.OS === 'android' ? false : undefined}
+            >
              {tApp('name')}
            </Text>
            {showConnectionBadge ? (
@@ -1757,6 +1765,7 @@ const styles = StyleSheet.create({
  },
  voiceDurationText: {
    fontSize: 18,
+    lineHeight: 24,
    fontWeight: '500',
  },
  voiceDurationTextUser: {
@@ -1879,15 +1888,13 @@ const styles = StyleSheet.create({
  },
  voiceRecordDurationWrap: {
    minWidth: 40,
-    height: 20,
+    minHeight: 20,
    alignItems: 'center',
    justifyContent: 'center',
+    paddingVertical: 1,
  },
+  /** 字号/行高由 voiceRecordDurationStyle 提供，避免大字模式仍锁 20px 高裁切 */
  voiceRecordDuration: {
-    fontSize: 12,
-    /** 与容器等高，避免 Android/iOS 数字相对胶囊上下偏移 */
-    height: 20,
-    lineHeight: 20,
    paddingVertical: 0,
    marginVertical: 0,
    color: 'rgba(27, 27, 31, 0.86)',
@@ -1905,7 +1912,7 @@ const styles = StyleSheet.create({
    width: '100%',
  },
  sendButton: {
-    height: 44,
+    minHeight: 44,
    paddingHorizontal: 16,
    paddingVertical: 11,
    borderRadius: 22,
--- a/app-expo/src/app/(tabs)/_layout.tsx
+++ b/app-expo/src/app/(tabs)/_layout.tsx
@@ -6,6 +6,7 @@ import { useColorScheme } from '@/hooks/use-color-scheme';
 import { useTranslation } from 'react-i18next';

 import { TabBarIcon } from '@/components/tab-bar-icon';
+import { useTypography } from '@/core/typography-context';
 import { useSession } from '@/features/auth/hooks';

 // Life-Echo bottom nav colors (from HTML reference)
@@ -27,6 +28,7 @@ const TAB_BAR_PADDING_HORIZONTAL = 12;

 export default function TabsLayout() {
  const { status } = useSession();
+  const typography = useTypography();
  const { colorScheme } = useColorScheme();
  const insets = useSafeAreaInsets();
  const isDark = colorScheme === 'dark';
@@ -75,7 +77,8 @@ export default function TabsLayout() {
          marginBottom: 0,
        },
        tabBarLabelStyle: {
-          fontSize: 11,
+          fontSize: typography.captionLarge,
+          lineHeight: typography.lineHeightTight,
          fontWeight: '600',
          textTransform: 'uppercase',
          marginTop: 4,
--- a/app-expo/src/app/(tabs)/index.tsx
+++ b/app-expo/src/app/(tabs)/index.tsx
@@ -154,14 +154,16 @@ function ConversationCard({
            {item.title}
          </Text>
          <Text
-            className="shrink-0 text-sm font-semibold uppercase tracking-wider text-muted-foreground"
+            variant="captionMedium"
+            className="shrink-0 font-semibold uppercase tracking-wider text-muted-foreground"
            style={{ fontVariant: ['tabular-nums'] }}
          >
            {formatRelativeConversationListTime(item.latestMessageTime, t)}
          </Text>
        </View>
        <Text
-          className="min-w-0 self-stretch text-base font-semibold text-muted-foreground"
+          variant="bodyMedium"
+          className="min-w-0 self-stretch font-semibold text-muted-foreground"
          numberOfLines={1}
          ellipsizeMode="tail"
        >
@@ -202,7 +204,8 @@ function SwipeableConversationCard({
    >
      <Icon as={Trash2} className="text-destructive-foreground" size={24} />
      <Text
-        className="mt-1 text-xs font-semibold text-destructive-foreground"
+        variant="captionSmall"
+        className="mt-1 font-semibold text-destructive-foreground"
        selectable={false}
      >
        {t('delete')}
@@ -405,11 +408,13 @@ export default function ConversationsScreen() {
                <Text
                  variant="h2"
                  className="text-center font-display text-primary"
-                  style={{ borderWidth: 0, fontSize: 28, lineHeight: 38 }}
                >
                  {t('greetingTitle')}
                </Text>
-                <Text className="text-center text-base font-medium leading-6 text-muted-foreground">
+                <Text
+                  variant="bodyLarge"
+                  className="text-center font-medium text-muted-foreground"
+                >
                  {t('emptyGreetingSubtitle')}
                </Text>
              </View>
@@ -429,13 +434,15 @@ export default function ConversationsScreen() {
                  <Text
                    variant="h2"
                    className="text-center font-display text-primary"
-                    style={{ borderWidth: 0, fontSize: 28, lineHeight: 38 }}
                  >
                    {showResumeEntry
                      ? t('resumeChatTitle')
                      : t('greetingTitle')}
                  </Text>
-                  <Text className="text-center text-base font-medium leading-6 text-muted-foreground">
+                  <Text
+                    variant="bodyLarge"
+                    className="text-center font-medium text-muted-foreground"
+                  >
                    {showResumeEntry
                      ? t('resumeChatSubtitle')
                      : t('emptyGreetingSubtitle')}
@@ -449,10 +456,14 @@ export default function ConversationsScreen() {
                    {t('recentChats')}
                  </Text>
                  <Pressable
-                    className="min-h-11 min-w-11 items-center justify-center active:opacity-70"
+                    className="min-h-11 items-center justify-center px-2 active:opacity-70"
+                    hitSlop={{ top: 6, bottom: 6, left: 4, right: 4 }}
                    onPress={() => {}}
                  >
-                    <Text className="text-sm font-semibold text-primary">
+                    <Text
+                      variant="bodySmall"
+                      className="font-semibold text-primary"
+                    >
                      {t('viewAll')}
                    </Text>
                  </Pressable>
--- a/app-expo/src/app/(tabs)/memoir.tsx
+++ b/app-expo/src/app/(tabs)/memoir.tsx
@@ -23,6 +23,7 @@ import { Icon } from '@/components/ui/icon';
 import { Skeleton } from '@/components/ui/skeleton';
 import { Text } from '@/components/ui/text';
 import { ScreenGutter } from '@/constants/layout';
+import { useTypography } from '@/core/typography-context';
 import { useCreateConversation } from '@/features/conversation/hooks';
 import {
  buildFrameworkChapterPlaceholders,
@@ -77,9 +78,18 @@ function ChapterCard({
  onReadPress: () => void;
  onContinuePress: () => void;
 }) {
+  const typography = useTypography();
  const { width } = useWindowDimensions();
  const contentWidth = Math.min(width - ScreenGutter * 2, 672);
  const gutter = ScreenGutter;
+  const completedTitleLineHeight = Math.max(
+    typography.lineHeightTight + 6,
+    typography.headingMedium + 6,
+  );
+  const draftingTitleLineHeight = Math.max(
+    typography.lineHeightTight + 4,
+    typography.titleLarge + 4,
+  );

  const chapterIndex = item.orderIndex + 1;
  const chapterLabel = t('chapterLabel').replace(
@@ -142,7 +152,8 @@ function ChapterCard({
        <View style={{ padding: gutter, gap: 12 }}>
          <View style={{ gap: 4, minHeight: 72 }}>
            <Text
-              className="text-xs font-medium text-muted-foreground"
+              variant="captionMedium"
+              className="font-medium text-muted-foreground"
              selectable
            >
              {chapterLabel}
@@ -150,7 +161,7 @@ function ChapterCard({
            <Text
              variant="h2"
              className="text-foreground"
-              style={{ lineHeight: 34 }}
+              style={{ lineHeight: completedTitleLineHeight }}
              numberOfLines={2}
              selectable
            >
@@ -161,7 +172,8 @@ function ChapterCard({
            <View className="flex-row items-center gap-2">
              <Icon as={FileText} className="text-muted-foreground" size={16} />
              <Text
-                className="text-sm font-medium text-muted-foreground"
+                variant="bodySmall"
+                className="font-medium text-muted-foreground"
                style={{ fontVariant: ['tabular-nums'] }}
                selectable
              >
@@ -174,7 +186,10 @@ function ChapterCard({
            style={{ borderCurve: 'continuous' }}
            onPress={onReadPress}
          >
-            <Text className="text-base font-semibold text-primary-foreground">
+            <Text
+              variant="bodyLarge"
+              className="font-semibold text-primary-foreground"
+            >
              {t('readMemory')}
            </Text>
          </Pressable>
@@ -197,7 +212,8 @@ function ChapterCard({
        <View className="gap-1">
          <View>
            <Text
-              className="text-xs font-medium text-muted-foreground"
+              variant="captionMedium"
+              className="font-medium text-muted-foreground"
              selectable
            >
              {chapterLabel}
@@ -205,7 +221,7 @@ function ChapterCard({
            <Text
              variant="h4"
              className="mt-0.5 text-foreground"
-              style={{ lineHeight: 28 }}
+              style={{ lineHeight: draftingTitleLineHeight }}
              numberOfLines={2}
              selectable
            >
@@ -213,7 +229,11 @@ function ChapterCard({
            </Text>
          </View>
          <View className="mt-2 flex-row items-center gap-2">
-            <Text className="text-sm font-medium text-secondary" selectable>
+            <Text
+              variant="bodySmall"
+              className="font-medium text-secondary"
+              selectable
+            >
              {t('statusDrafting')}
            </Text>
          </View>
@@ -223,7 +243,7 @@ function ChapterCard({
          style={{ borderCurve: 'continuous' }}
          onPress={onContinuePress}
        >
-          <Text className="text-base font-semibold text-secondary">
+          <Text variant="bodyLarge" className="font-semibold text-secondary">
            {t('continueWriting')}
          </Text>
        </Pressable>
@@ -237,7 +257,7 @@ function MemoirLoadError({ onRetry }: { onRetry: () => void }) {
  const { t } = useTranslation('memoir');
  return (
    <View className="items-center gap-4 rounded-2xl border border-dashed border-border bg-muted/20 p-10">
-      <Text className="text-center text-base text-destructive">
+      <Text variant="bodyLarge" className="text-center text-destructive">
        {t('loadErrorMessage')}
      </Text>
      <Pressable
@@ -245,7 +265,10 @@ function MemoirLoadError({ onRetry }: { onRetry: () => void }) {
        style={{ borderCurve: 'continuous' }}
        onPress={onRetry}
      >
-        <Text className="font-semibold text-primary-foreground">
+        <Text
+          variant="bodyMedium"
+          className="font-semibold text-primary-foreground"
+        >
          {t('loadErrorRetry')}
        </Text>
      </Pressable>
--- a/app-expo/src/app/(tabs)/profile.tsx
+++ b/app-expo/src/app/(tabs)/profile.tsx
@@ -90,11 +90,15 @@ function LanguageRow({
        <Icon as={Globe} className="text-muted-foreground" size={20} />
        <View>
          <Text className="font-medium text-foreground">{label}</Text>
-          <Text className="text-sm text-muted-foreground">{description}</Text>
+          <Text variant="bodySmall" className="text-muted-foreground">
+            {description}
+          </Text>
        </View>
      </View>
      <View className="flex-row items-center gap-2">
-        <Text className="text-sm text-muted-foreground">{currentLabel}</Text>
+        <Text variant="bodySmall" className="text-muted-foreground">
+          {currentLabel}
+        </Text>
        <Icon as={ChevronRight} className="text-muted-foreground" size={20} />
      </View>
    </Pressable>
@@ -120,7 +124,9 @@ function SettingRow({
        <Icon as={SettingIcon} className="text-muted-foreground" size={20} />
        <View>
          <Text className="font-medium text-foreground">{label}</Text>
-          <Text className="text-sm text-muted-foreground">{description}</Text>
+          <Text variant="bodySmall" className="text-muted-foreground">
+            {description}
+          </Text>
        </View>
      </View>
      <Switch checked={value} onCheckedChange={onValueChange} />
@@ -203,7 +209,7 @@ export default function ProfileScreen() {
          <Text variant="h3" className="text-foreground">
            {user?.nickname ?? t('userNamePlaceholder')}
          </Text>
-          <Text className="text-sm text-muted-foreground">
+          <Text variant="bodySmall" className="text-muted-foreground">
            {t('userTier', { tier: tierLabel })}
          </Text>
        </View>
--- a/app-expo/src/components/screen-header.tsx
+++ b/app-expo/src/components/screen-header.tsx
@@ -1,12 +1,20 @@
 import { router } from 'expo-router';
 import { ArrowLeft } from 'lucide-react-native';
 import React from 'react';
-import { Pressable, View } from 'react-native';
+import { Platform, Pressable, Text as RNText, View } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';

 import { Icon } from '@/components/ui/icon';
-import { Text } from '@/components/ui/text';
+import { useTypography } from '@/core/typography-context';
 import { ScreenGutter } from '@/constants/layout';
+import { useAppSettings } from '@/hooks/use-app-settings';
+
+/** 默认最小触控目标 48dp；大字模式下与标题字号匹配，略向左扩展便于够到边缘 */
+const BACK_HIT_MIN = 48;
+const BACK_HIT_MIN_LARGE = 56;
+const BACK_ICON_SIZE = 24;
+const BACK_ICON_SIZE_LARGE = 30;
+const BACK_EXTRA_HIT_LEFT = 4;

 export type ScreenHeaderVariant = 'default' | 'chat' | 'reading';

@@ -64,21 +72,44 @@ export function ScreenHeader({
  useSafeArea = true,
 }: ScreenHeaderProps) {
  const insets = useSafeAreaInsets();
+  const { largeText } = useAppSettings();
+  const typography = useTypography();
  const colors = VARIANT_COLORS[variant];

+  const backTouchMin = largeText ? BACK_HIT_MIN_LARGE : BACK_HIT_MIN;
+  const backIconSize = largeText ? BACK_ICON_SIZE_LARGE : BACK_ICON_SIZE;
+
  const handleBack = onBack ?? (() => router.back());
  const bgColor = backgroundColor ?? colors.background;
  const titleColor = colors.title;
  const iconColor = colors.icon ?? colors.iconSecondary;

+  /**
+   * 不要用外层 minHeight「框死」整块栏：paddingTop 含安全区时会把内容区压扁。
+   * 标题行最小高度随当前排版 token 计算（关大字也要留够，避免裁字 / Android font padding）。
+   */
+  const barPaddingBottom = largeText ? 18 : 16;
+  const titleRowPaddingV = largeText ? 8 : 4;
+  const titleFontSize =
+    variant === 'chat'
+      ? largeText
+        ? typography.headingMedium
+        : typography.headingSmall
+      : Math.max(typography.titleLarge, typography.headingSmall);
+  const titleLineMin =
+    variant === 'chat'
+      ? Math.ceil(titleFontSize * (largeText ? 1.45 : 1.38)) +
+        (largeText ? 14 : 10)
+      : Math.ceil(titleFontSize * 1.32) + (largeText ? 10 : 8);
+  const titleRowMinHeight = Math.max(backTouchMin, titleLineMin);
+
  const containerStyle = {
    flexDirection: 'row' as const,
    alignItems: 'center' as const,
    justifyContent: 'space-between' as const,
    paddingHorizontal: Math.max(ScreenGutter, 16),
    paddingTop: useSafeArea ? Math.max(insets.top, 12) : 12,
-    paddingBottom: 16,
-    minHeight: 56,
+    paddingBottom: barPaddingBottom,
    ...(bgColor && { backgroundColor: bgColor }),
    ...(absolute && {
      position: 'absolute' as const,
@@ -105,41 +136,74 @@ export function ScreenHeader({
          gap: 12,
          flex: 1,
          minWidth: 0,
+          paddingVertical: titleRowPaddingV,
+          minHeight: titleRowMinHeight,
        }}
      >
        {showBack && (
          <Pressable
            onPress={handleBack}
+            hitSlop={
+              Platform.OS === 'android'
+                ? {
+                    top: largeText ? 10 : 6,
+                    bottom: largeText ? 10 : 6,
+                    right: 8,
+                    left: BACK_EXTRA_HIT_LEFT,
+                  }
+                : {
+                    top: largeText ? 8 : 4,
+                    bottom: largeText ? 8 : 4,
+                    left: 2,
+                    right: 4,
+                  }
+            }
+            android_ripple={
+              Platform.OS === 'android'
+                ? { borderless: true, radius: backTouchMin / 2 }
+                : undefined
+            }
            style={({ pressed }) => ({
-              padding: 8,
+              minWidth: backTouchMin,
+              minHeight: backTouchMin,
+              marginLeft: -BACK_EXTRA_HIT_LEFT,
+              alignItems: 'center',
+              justifyContent: 'center',
              borderRadius: 9999,
-              opacity: pressed ? 0.7 : 1,
+              opacity: Platform.OS === 'android' ? 1 : pressed ? 0.7 : 1,
            })}
            accessibilityRole="button"
            accessibilityLabel={backAccessibilityLabel}
          >
            {iconColor ? (
-              <Icon as={ArrowLeft} size={24} color={iconColor} />
+              <Icon as={ArrowLeft} size={backIconSize} color={iconColor} />
            ) : (
-              <Icon as={ArrowLeft} size={24} className="text-foreground" />
+              <Icon
+                as={ArrowLeft}
+                size={backIconSize}
+                className="text-foreground"
+              />
            )}
          </Pressable>
        )}
        {typeof title === 'string' ? (
-          <Text
+          <RNText
            numberOfLines={1}
            selectable
            style={{
              flex: 1,
-              fontSize: variant === 'chat' ? 24 : 18,
+              fontSize: variant === 'chat' ? titleFontSize : 18,
+              lineHeight:
+                variant === 'chat'
+                  ? Math.ceil(titleFontSize * 1.35)
+                  : Math.ceil(18 * 1.32),
              fontWeight: '700',
              letterSpacing: -0.5,
              ...(titleColor && { color: titleColor }),
            }}
-            className={!titleColor ? 'text-foreground' : undefined}
          >
            {title}
-          </Text>
+          </RNText>
        ) : (
          <View style={{ flex: 1, minWidth: 0 }}>{title}</View>
        )}
--- a/app-expo/src/components/ui/alert-dialog.tsx
+++ b/app-expo/src/components/ui/alert-dialog.tsx
@@ -1,6 +1,7 @@
 import { buttonTextVariants, buttonVariants } from '@/components/ui/button';
 import { NativeOnlyAnimatedView } from '@/components/ui/native-only-animated-view';
 import { TextClassContext } from '@/components/ui/text';
+import { useTypography } from '@/core/typography-context';
 import { cn } from '@/lib/utils';
 import * as AlertDialogPrimitive from '@rn-primitives/alert-dialog';
 import * as React from 'react';
@@ -97,11 +98,20 @@ function AlertDialogFooter({ className, ...props }: ViewProps) {

 function AlertDialogTitle({
  className,
+  style,
  ...props
 }: AlertDialogPrimitive.TitleProps & React.RefAttributes<AlertDialogPrimitive.TitleRef>) {
+  const typography = useTypography();
  return (
    <AlertDialogPrimitive.Title
-      className={cn('min-w-0 text-foreground text-lg font-semibold', className)}
+      className={cn('min-w-0 text-foreground font-semibold', className)}
+      style={[
+        {
+          fontSize: typography.titleLarge,
+          lineHeight: typography.lineHeightTight,
+        },
+        style,
+      ]}
      {...props}
    />
  );
@@ -113,15 +123,20 @@ function AlertDialogDescription({
  ...props
 }: AlertDialogPrimitive.DescriptionProps &
  React.RefAttributes<AlertDialogPrimitive.DescriptionRef>) {
+  const typography = useTypography();
  return (
    <AlertDialogPrimitive.Description
      className={cn(
        // shrink: RN 中 Text 在 flex 内需 flexShrink 才能按父宽换行
-        'w-full min-w-0 shrink text-muted-foreground text-sm',
+        'w-full min-w-0 shrink text-muted-foreground',
        className
      )}
      style={[
        Platform.OS === 'web' ? undefined : { flexShrink: 1 },
+        {
+          fontSize: typography.bodyMedium,
+          lineHeight: typography.lineHeightLoose,
+        },
        style,
      ]}
      {...props}
@@ -135,7 +150,15 @@ function AlertDialogAction({
 }: AlertDialogPrimitive.ActionProps & React.RefAttributes<AlertDialogPrimitive.ActionRef>) {
  return (
    <TextClassContext.Provider value={buttonTextVariants({ className })}>
-      <AlertDialogPrimitive.Action className={cn(buttonVariants(), className)} {...props} />
+      <AlertDialogPrimitive.Action
+        className={cn(
+          buttonVariants(),
+          // 大字模式下文与行高变大，固定 h-10 会裁切标签（如「知道了」）
+          'h-auto min-h-14 py-3.5',
+          className
+        )}
+        {...props}
+      />
    </TextClassContext.Provider>
  );
 }
@@ -147,7 +170,11 @@ function AlertDialogCancel({
  return (
    <TextClassContext.Provider value={buttonTextVariants({ className, variant: 'outline' })}>
      <AlertDialogPrimitive.Cancel
-        className={cn(buttonVariants({ variant: 'outline' }), className)}
+        className={cn(
+          buttonVariants({ variant: 'outline' }),
+          'h-auto min-h-14 py-3.5',
+          className
+        )}
        {...props}
      />
    </TextClassContext.Provider>
--- a/app-expo/src/components/ui/text.tsx
+++ b/app-expo/src/components/ui/text.tsx
@@ -3,7 +3,13 @@ import { cn } from '@/lib/utils';
 import * as Slot from '@rn-primitives/slot';
 import { cva, type VariantProps } from 'class-variance-authority';
 import * as React from 'react';
-import { Platform, Text as RNText, type Role } from 'react-native';
+import {
+  Platform,
+  StyleSheet,
+  Text as RNText,
+  type Role,
+  type TextStyle,
+} from 'react-native';

 /**
 * Maps Text variant to design-token keys for fontSize and lineHeight.
@@ -122,6 +128,22 @@ const ARIA_LEVEL: Partial<Record<TextVariant, string>> = {

 const TextClassContext = React.createContext<string | undefined>(undefined);

+/** Android 上 lineHeight < fontSize 会裁切字形（如标题配 lineHeightTight） */
+const MIN_LINE_HEIGHT_RATIO = 1.2;
+
+function ensureMinimumLineHeight(style: TextStyle): TextStyle {
+  const fs = style.fontSize;
+  const lh = style.lineHeight;
+  if (typeof fs !== 'number' || typeof lh !== 'number') {
+    return style;
+  }
+  const minLh = Math.ceil(fs * MIN_LINE_HEIGHT_RATIO);
+  if (lh < minLh) {
+    return { ...style, lineHeight: minLh };
+  }
+  return style;
+}
+
 function Text({
  className,
  asChild = false,
@@ -151,12 +173,19 @@ function Text({
        }
      : undefined;

+  const flatStyle = StyleSheet.flatten([
+    { textAlign: 'left' as const },
+    typographyStyle,
+    style,
+  ]) as TextStyle;
+  const resolvedStyle = ensureMinimumLineHeight(flatStyle);
+
  return (
    <Component
      className={cn(textVariants({ variant }), textClass, className)}
      role={variant ? ROLE[variant] : undefined}
      aria-level={variant ? ARIA_LEVEL[variant] : undefined}
-      style={[{ textAlign: 'left' }, typographyStyle, style]}
+      style={resolvedStyle}
      {...props}
    />
  );
--- a/app-expo/src/core/typography-context.tsx
+++ b/app-expo/src/core/typography-context.tsx
@@ -1,12 +1,14 @@
 /**
- * Typography context for large text mode (大字模式).
+ * Global typography from design tokens.
+ *
+ * - **关大字模式** → `typography.large`（舒适基准，不用过小的 `normal` 档）
+ * - **开大字模式** → `typography.xlarge`（一级页、正文等整体再放大一档）
+ *
+ * 对话气泡等仍可在页面内用 `largeText` 做更大一级的 token 选择。
 *
 * Uses React Context instead of NativeWind vars() because vars() returns empty
- * objects on native (iOS/Android), so CSS variables never cascade to children.
- * See: https://github.com/nativewind/nativewind/issues/1113
- *
- * NativeWind vars() docs (works on web only):
- * https://www.nativewind.dev/docs/api/vars
+ * objects on native (iOS/Android). See:
+ * https://github.com/nativewind/nativewind/issues/1113
 */
 import React, {
  createContext,
@@ -19,18 +21,23 @@ import { useAppSettings } from '@/hooks/use-app-settings';

 import tokens from '../../design-tokens.json';

-export type TypographyMode = 'normal' | 'large';
+export type TypographyScale = 'large' | 'xlarge';

 export type TypographyTokens = Record<string, number>;

 const TypographyContext = createContext<TypographyTokens | null>(null);

+const SCALE: Record<TypographyScale, TypographyTokens> = {
+  large: tokens.typography.large as TypographyTokens,
+  xlarge: tokens.typography.xlarge as TypographyTokens,
+};
+
 export function TypographyProvider({ children }: PropsWithChildren) {
  const { largeText } = useAppSettings();
-  const typography = useMemo(() => {
-    const mode: TypographyMode = largeText ? 'large' : 'normal';
-    return tokens.typography[mode] as TypographyTokens;
-  }, [largeText]);
+  const typography = useMemo(
+    () => SCALE[largeText ? 'xlarge' : 'large'],
+    [largeText],
+  );

  return (
    <TypographyContext.Provider value={typography}>