diff --git a/client/src/dom.ts b/client/src/dom.ts
index 609c38a..e380c80 100644
--- a/client/src/dom.ts
+++ b/client/src/dom.ts
@@ -374,11 +374,24 @@ export function createChatWindow(config: ResolvedConfig): {
   const inputEl = document.createElement('t-chat-sender');
   inputEl.id = 'csk-input';
   inputEl.setAttribute('placeholder', t('placeholder'));
+  // 压缩输入框：autosize 为 Object 复杂类型，走 property 赋值（同 dom.ts createChatItemMsg 的 content 处理）
+  (inputEl as unknown as { autosize: { minRows: number } }).autosize = { minRows: 1 };
   inputArea.appendChild(inputEl);
 
-  // === 保密声明脚注 ===
+  // === 保密声明脚注（默认折叠为单行，点击展开完整条文） ===
   const disclaimer = document.createElement('div');
   disclaimer.className = 'csk-disclaimer';
+  disclaimer.setAttribute('role', 'button');
+  disclaimer.setAttribute('tabindex', '0');
+  disclaimer.setAttribute('aria-expanded', 'false');
+  const toggleDisclaimer = () => {
+    const expanded = disclaimer.classList.toggle('csk-disclaimer--expanded');
+    disclaimer.setAttribute('aria-expanded', String(expanded));
+  };
+  disclaimer.addEventListener('click', toggleDisclaimer);
+  disclaimer.addEventListener('keydown', (e) => {
+    if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); toggleDisclaimer(); }
+  });
   if (config.disclaimer !== undefined) {
     // 用户自定义或传空串隐藏。
     // 注意：disclaimer 语义为「受信 HTML」（由宿主开发者或后端管理员配置），
diff --git a/client/src/styles.ts b/client/src/styles.ts
index 7100a44..1f37456 100644
--- a/client/src/styles.ts
+++ b/client/src/styles.ts
@@ -51,6 +51,9 @@ function cssVars(config: ResolvedConfig): string {
     --td-brand-color-light-hover: ${lighter};
     /* 覆盖 TDesign chat-item 默认 800px 限制,使 AI 回复内容自适应 SDK 弹窗宽度 */
     --td-chat-item-content-max-width: 100%;
+    /* 压缩输入组件：缩小内容区上下 padding 与字号（变量穿透 shadow DOM 生效于 t-chat-sender） */
+    --td-chat-input-padding: 8px 12px;
+    --td-chat-input-font-size: 14px;
   `;
 }
 
@@ -354,21 +357,14 @@ function getStyles(config: ResolvedConfig): string {
 }
 
 /* 消息气泡 */
+/* 注意：.csk-msg 为块级纵向容器。头像 + 气泡的横向对齐由 t-chat-item 内部（placement 属性）完成，
+   sources / suggestions 直接 append 到 wrapper 末尾，须纵向堆叠在气泡下方，不能用 flex row 排布 */
 .csk-msg {
-  display: flex;
   margin-bottom: 16px;
   max-width: 100%;
   word-break: break-word;
   animation: csk-msg-in 0.28s cubic-bezier(0.22, 1, 0.36, 1);
 }
-.csk-msg--user {
-  flex-direction: row-reverse;
-  align-items: flex-end;
-}
-.csk-msg--ai {
-  flex-direction: row;
-  align-items: flex-start;
-}
 
 @keyframes csk-msg-in {
   from { opacity: 0; transform: translateY(8px); }
@@ -381,7 +377,7 @@ function getStyles(config: ResolvedConfig): string {
 
 /* ========== 输入区 ========== */
 .csk-input-area {
-  padding: 10px 12px 14px;
+  padding: 8px 12px 10px;
   background: #fff;
   border-top: 1px solid var(--csk-border);
   flex-shrink: 0;
@@ -389,18 +385,24 @@ function getStyles(config: ResolvedConfig): string {
 
 /* ========== 保密声明脚注 ========== */
 .csk-disclaimer {
-  margin-top: 8px;
-  padding: 6px 8px 4px;
+  margin-top: 4px;
+  padding: 4px 8px 2px;
   font-size: 10px;
   color: #9CA3AF;
-  line-height: 1.5;
+  line-height: 1.4;
   user-select: none;
+  cursor: pointer;
 }
 .csk-disclaimer__title {
   font-weight: 600;
   margin-bottom: 2px;
   color: #9CA3AF;
 }
+/* 折叠态：默认只显示首行（标题），其余条文隐藏；标题末尾加 ▾ 提示可展开 */
+.csk-disclaimer > :not(:first-child) { display: none; }
+.csk-disclaimer > :first-child::after { content: ' ▾'; }
+.csk-disclaimer--expanded > :not(:first-child) { display: block; }
+.csk-disclaimer--expanded > :first-child::after { content: ' ▴'; }
 .csk-dark .csk-disclaimer { color: #6B7280; }
 .csk-dark .csk-disclaimer__title { color: #6B7280; }