diff --git a/web/styles/tokens.css b/web/styles/tokens.css
index ea89a2f..e0b4b0f 100644
--- a/web/styles/tokens.css
+++ b/web/styles/tokens.css
@@ -112,6 +112,11 @@ body,
   height: 100%;
 }
 
+/* 页面高度跨过视口阈值时滚动条出现消失，内容会横向抖一下；把滚动条的位置常驻留出来 */
+html {
+  scrollbar-gutter: stable;
+}
+
 body {
   margin: 0;
   background: var(--c-bg);
diff --git a/web/views/InboundDetail.vue b/web/views/InboundDetail.vue
index fefd377..6d92ef5 100644
--- a/web/views/InboundDetail.vue
+++ b/web/views/InboundDetail.vue
@@ -158,23 +158,29 @@ function lockHeight() {
 }
 
 /**
- * v-if 内容的展开收起动画：高度在 0 和实际值之间过渡，结束后清掉内联样式。
- * 给配置表单和链式代理段用。auto 高度不可插值，只能量出来做。
+ * v-if 内容的展开收起动画：高度和上外边距一起在 0 和实际值之间过渡，结束后清掉
+ * 内联样式。给配置表单和链式代理段用。auto 高度不可插值，只能量出来做。
+ * 外边距必须一起动：链式代理段顶着 .block + .block 给的 24px margin，它在高度
+ * 动画之外，不带上它出现和消失的瞬间就各抖一下。
  */
 function foldEnter(element: Element, done: () => void) {
   const el = element as HTMLElement
   // 先量再压：此刻元素是自然高度，revealBottom 量到的就是折叠结束后的位置
   revealBottom()
+  const margin = getComputedStyle(el).marginTop
   el.style.height = '0'
+  el.style.marginTop = '0'
   el.style.overflow = 'hidden'
   void el.offsetHeight
-  el.style.transition = 'height 0.15s ease'
+  el.style.transition = 'height 0.15s ease, margin-top 0.15s ease'
   el.style.height = `${String(el.scrollHeight)}px`
+  el.style.marginTop = margin
   el.addEventListener(
     'transitionend',
     () => {
       el.style.transition = ''
       el.style.height = ''
+      el.style.marginTop = ''
       el.style.overflow = ''
       done()
     },
@@ -187,8 +193,9 @@ function foldLeave(element: Element, done: () => void) {
   el.style.height = `${String(el.offsetHeight)}px`
   el.style.overflow = 'hidden'
   void el.offsetHeight
-  el.style.transition = 'height 0.15s ease'
+  el.style.transition = 'height 0.15s ease, margin-top 0.15s ease'
   el.style.height = '0'
+  el.style.marginTop = '0'
   el.addEventListener('transitionend', done, { once: true })
 }