diff --git a/src/core.js b/src/core.js
index cf39a3f..0d1170e 100644
--- a/src/core.js
+++ b/src/core.js
@@ -6,13 +6,15 @@
  */
 
 import { generateId, escapeHTML, prefersDark } from './utils.js';
-import { DEFAULTS, ICONS, TYPE_COLORS } from './constants.js';
+import { DEFAULTS, ICONS, TYPE_COLORS, THEMES } from './constants.js';
 import { injectStyles } from './styles.js';
 import { getTheme, applyTheme } from './themes.js';
 import { t as i18nT, setCurrentLocale } from './i18n.js';
 
 // 模块级共享容器缓存，所有 Toast 实例共用
-const _containerCache = new WeakMap();
+// 使用 Map 而非 WeakMap：document.body 在页面存活期间永不被 GC，
+// 容器需要显式通过 destroy() 清理，WeakMap 在此场景无实际收益。
+const _containerCache = new Map();
 
 /**
  * 参数标准化工具
@@ -90,17 +92,8 @@ class Toast {
   _palette() {
     const theme = getTheme(this.config.theme);
     const c = TYPE_COLORS[this.type] || TYPE_COLORS.default;
-    const t = theme === 'dark'
-      ? { 
-          bg: 'rgba(28,32,40,.94)', 
-          border: 'rgba(255,255,255,.08)', 
-          shadow: '0 10px 36px -10px rgba(0,0,0,.6),0 4px 14px -4px rgba(0,0,0,.4)' 
-        }
-      : { 
-          bg: 'rgba(255,255,255,.96)', 
-          border: 'rgba(0,0,0,.06)', 
-          shadow: '0 10px 36px -10px rgba(0,0,0,.18),0 4px 14px -4px rgba(0,0,0,.08)' 
-        };
+    const tc = THEMES[theme] || THEMES.light;
+    const t = { bg: tc.bg, border: tc.border, shadow: tc.shadow };
     return { theme, c, t };
   }
 
@@ -922,7 +915,7 @@ const meToast = {
     const t = this._emit({
       ...opts,
       type: opts.type || 'warning',
-      message: message.replace('{seconds}', remaining),
+      message: message.replace(/\{seconds\}/g, remaining),
       duration: 0,
       closeButton: true,
       showProgress: false,
@@ -946,7 +939,7 @@ const meToast = {
       }
       
       t.update({
-        message: message.replace('{seconds}', remaining),
+        message: message.replace(/\{seconds\}/g, remaining),
       });
     };
     
@@ -986,6 +979,7 @@ const meToast = {
     return new Promise((resolve) => {
       let index = 0;
       const delay = opts.delay || 1000;
+      const userOnClose = opts.onClose;
       
       const showNext = () => {
         if (index >= messages.length) {
@@ -1003,7 +997,10 @@ const meToast = {
           ...((typeof message === 'object' && message !== null) ? message : {}),
           message: msg,
           duration: opts.duration || 3000,
-          onClose: () => {
+          onClose: (toast) => {
+            if (typeof userOnClose === 'function') {
+              try { userOnClose(toast); } catch (_) {}
+            }
             setTimeout(showNext, delay);
           },
         });
@@ -1064,6 +1061,7 @@ const meToast = {
     }
     
     this._toasts.clear();
+    _containerCache.clear();
   },
   
   getAll() {