diff --git a/src/components/config/VisualConfigEditor.module.scss b/src/components/config/VisualConfigEditor.module.scss
index d727749..832148b 100644
--- a/src/components/config/VisualConfigEditor.module.scss
+++ b/src/components/config/VisualConfigEditor.module.scss
@@ -72,6 +72,61 @@
   }
 }
 
+.expandableInputWrapper {
+  position: relative;
+  display: flex;
+  align-items: flex-start;
+  min-width: 0;
+  flex: 1;
+}
+
+.expandableInputWrapper > .expandableTextarea,
+.expandableInputWrapper > :global(.input) {
+  flex: 1;
+  min-width: 0;
+  padding-right: 28px;
+}
+
+.expandableTextarea {
+  resize: none;
+  min-height: 60px;
+  overflow: hidden;
+  line-height: 1.5;
+  padding-right: 32px;
+}
+
+.expandableToggle {
+  position: absolute;
+  right: 6px;
+  top: 50%;
+  transform: translateY(-50%);
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 10px;
+  line-height: 1;
+  padding: 2px;
+  color: var(--text-secondary, #999);
+  opacity: 0.5;
+  transition: opacity 0.15s;
+  z-index: 1;
+
+  &:hover {
+    opacity: 1;
+  }
+
+  &:disabled {
+    cursor: default;
+    opacity: 0.35;
+  }
+}
+
+.expandableInputExpanded .expandableToggle {
+  top: 8px;
+  transform: none;
+  right: 14px;
+}
+
 .overview {
   position: relative;
   overflow: hidden;
diff --git a/src/components/config/VisualConfigEditorBlocks.tsx b/src/components/config/VisualConfigEditorBlocks.tsx
index fdf1301..6f24a15 100644
--- a/src/components/config/VisualConfigEditorBlocks.tsx
+++ b/src/components/config/VisualConfigEditorBlocks.tsx
@@ -1,4 +1,4 @@
-import { memo, useId, useMemo, useState } from 'react';
+import { memo, useCallback, useId, useLayoutEffect, useMemo, useRef, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Button } from '@/components/ui/Button';
 import { Modal } from '@/components/ui/Modal';
@@ -23,6 +23,109 @@ import {
 import { maskApiKey } from '@/utils/format';
 import { isValidApiKeyCharset } from '@/utils/validation';
 
+/** Minimum character count before the expand/collapse toggle appears. */
+const EXPAND_THRESHOLD = 30;
+
+/** Auto-expanding textarea that collapses back to a single-line input on demand. */
+function ExpandableInput({
+  value,
+  placeholder,
+  ariaLabel,
+  disabled,
+  className,
+  onChange,
+}: {
+  value: string;
+  placeholder?: string;
+  ariaLabel?: string;
+  disabled?: boolean;
+  className?: string;
+  onChange: (nextValue: string) => void;
+}) {
+  const { t } = useTranslation();
+  const [collapsed, setCollapsed] = useState(true);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  const autoResize = useCallback((el: HTMLTextAreaElement) => {
+    el.style.height = 'auto';
+    el.style.height = `${el.scrollHeight}px`;
+  }, []);
+
+  const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+    // Strip newlines — these fields are single-line identifiers/paths that
+    // would break YAML serialization if they contained line breaks.
+    const sanitized = e.target.value.replace(/[\r\n]/g, '');
+    onChange(sanitized);
+    // autoResize is handled by useLayoutEffect after React syncs the
+    // sanitized value back to the DOM — calling it here would measure
+    // stale content.
+  };
+
+  // Resize synchronously before paint to avoid visual flicker.
+  useLayoutEffect(() => {
+    if (!collapsed && textareaRef.current) {
+      autoResize(textareaRef.current);
+    }
+  }, [collapsed, value, autoResize]);
+
+  if (collapsed) {
+    return (
+      <div className={styles.expandableInputWrapper}>
+        <input
+          className={`input ${className ?? ''}`}
+          placeholder={placeholder}
+          aria-label={ariaLabel}
+          value={value}
+          onChange={(e) => onChange(e.target.value.replace(/[\r\n]/g, ''))}
+          disabled={disabled}
+        />
+        {value.length > EXPAND_THRESHOLD && (
+          <button
+            type="button"
+            className={styles.expandableToggle}
+            disabled={disabled}
+            onClick={() => {
+              setCollapsed(false);
+              requestAnimationFrame(() => {
+                textareaRef.current?.focus();
+              });
+            }}
+            title={t('common.expand')}
+            aria-label={t('common.expand')}
+          >
+            ▼
+          </button>
+        )}
+      </div>
+    );
+  }
+
+  return (
+    <div className={`${styles.expandableInputWrapper} ${styles.expandableInputExpanded}`}>
+      <textarea
+        ref={textareaRef}
+        className={`input ${styles.expandableTextarea} ${className ?? ''}`}
+        placeholder={placeholder}
+        aria-label={ariaLabel}
+        value={value}
+        onChange={handleChange}
+        disabled={disabled}
+        rows={2}
+      />
+      <button
+        type="button"
+        className={styles.expandableToggle}
+        disabled={disabled}
+        onClick={() => setCollapsed(true)}
+        title={t('common.collapse')}
+        aria-label={t('common.collapse')}
+      >
+        ▲
+      </button>
+    </div>
+  );
+}
+
 function getValidationMessage(
   t: ReturnType<typeof useTranslation>['t'],
   errorCode?: PayloadParamValidationErrorCode
@@ -325,14 +428,12 @@ const StringListEditor = memo(function StringListEditor({
     <div className={styles.stringList}>
       {items.map((item, index) => (
         <div key={renderItemIds[index] ?? `item-${index}`} className={styles.stringListRow}>
-          <input
-            className="input"
+          <ExpandableInput
             placeholder={placeholder}
-            aria-label={inputAriaLabel ?? placeholder}
+            ariaLabel={inputAriaLabel ?? placeholder}
             value={item}
-            onChange={(e) => updateItem(index, e.target.value)}
+            onChange={(nextValue) => updateItem(index, nextValue)}
             disabled={disabled}
-            style={{ flex: 1 }}
           />
           <Button variant="ghost" size="sm" onClick={() => removeItem(index)} disabled={disabled}>
             {t('config_management.visual.common.delete')}
@@ -508,12 +609,11 @@ export const PayloadRulesEditor = memo(function PayloadRulesEditor({
     }
 
     return (
-      <input
-        className="input"
+      <ExpandableInput
         placeholder={getValuePlaceholder(param.valueType)}
-        aria-label={t('config_management.visual.payload_rules.param_value')}
+        ariaLabel={t('config_management.visual.payload_rules.param_value')}
         value={param.value}
-        onChange={(e) => updateParam(ruleIndex, paramIndex, { value: e.target.value })}
+        onChange={(nextValue) => updateParam(ruleIndex, paramIndex, { value: nextValue })}
         disabled={disabled}
       />
     );
@@ -564,23 +664,21 @@ export const PayloadRulesEditor = memo(function PayloadRulesEditor({
                         })
                       }
                     />
-                    <input
-                      className="input"
+                    <ExpandableInput
                       placeholder={t('config_management.visual.payload_rules.model_name')}
-                      aria-label={t('config_management.visual.payload_rules.model_name')}
+                      ariaLabel={t('config_management.visual.payload_rules.model_name')}
                       value={model.name}
-                      onChange={(e) => updateModel(ruleIndex, modelIndex, { name: e.target.value })}
+                      onChange={(nextValue) => updateModel(ruleIndex, modelIndex, { name: nextValue })}
                       disabled={disabled}
                     />
                   </>
                 ) : (
                   <>
-                    <input
-                      className="input"
+                    <ExpandableInput
                       placeholder={t('config_management.visual.payload_rules.model_name')}
-                      aria-label={t('config_management.visual.payload_rules.model_name')}
+                      ariaLabel={t('config_management.visual.payload_rules.model_name')}
                       value={model.name}
-                      onChange={(e) => updateModel(ruleIndex, modelIndex, { name: e.target.value })}
+                      onChange={(nextValue) => updateModel(ruleIndex, modelIndex, { name: nextValue })}
                       disabled={disabled}
                     />
                     <Select
@@ -629,12 +727,11 @@ export const PayloadRulesEditor = memo(function PayloadRulesEditor({
               return (
                 <div key={param.id} className={styles.payloadRuleParamGroup}>
                   <div className={styles.payloadRuleParamRow}>
-                    <input
-                      className="input"
+                    <ExpandableInput
                       placeholder={t('config_management.visual.payload_rules.json_path')}
-                      aria-label={t('config_management.visual.payload_rules.json_path')}
+                      ariaLabel={t('config_management.visual.payload_rules.json_path')}
                       value={param.path}
-                      onChange={(e) => updateParam(ruleIndex, paramIndex, { path: e.target.value })}
+                      onChange={(nextValue) => updateParam(ruleIndex, paramIndex, { path: nextValue })}
                       disabled={disabled}
                     />
                     {rawJsonValues ? null : (
@@ -767,12 +864,11 @@ export const PayloadFilterRulesEditor = memo(function PayloadFilterRulesEditor({
             </div>
             {rule.models.map((model, modelIndex) => (
               <div key={model.id} className={styles.payloadFilterModelRow}>
-                <input
-                  className="input"
+                <ExpandableInput
                   placeholder={t('config_management.visual.payload_rules.model_name')}
-                  aria-label={t('config_management.visual.payload_rules.model_name')}
+                  ariaLabel={t('config_management.visual.payload_rules.model_name')}
                   value={model.name}
-                  onChange={(e) => updateModel(ruleIndex, modelIndex, { name: e.target.value })}
+                  onChange={(nextValue) => updateModel(ruleIndex, modelIndex, { name: nextValue })}
                   disabled={disabled}
                 />
                 <Select
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 3d8ddfd..1951c66 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -41,6 +41,8 @@
     "quota_update_required": "Please update the CPA version or check for updates",
     "quota_check_credential": "Please check the credential status",
     "copy": "Copy",
+    "expand": "Expand",
+    "collapse": "Collapse",
     "status": "Status",
     "action": "Action",
     "custom_headers_label": "Custom Headers",
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index a3edcff..f349ace 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -41,6 +41,8 @@
     "quota_update_required": "Пожалуйста, обновите CPA или проверьте наличие обновлений",
     "quota_check_credential": "Пожалуйста, проверьте статус учётных данных",
     "copy": "Копировать",
+    "expand": "Развернуть",
+    "collapse": "Свернуть",
     "status": "Статус",
     "action": "Действие",
     "custom_headers_label": "Пользовательские заголовки",
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index bd66eab..60a8042 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -41,6 +41,8 @@
     "quota_update_required": "请更新 CPA 版本或检查更新",
     "quota_check_credential": "请检查凭证状态",
     "copy": "复制",
+    "expand": "展开",
+    "collapse": "收起",
     "status": "状态",
     "action": "操作",
     "custom_headers_label": "自定义请求头",