diff --git a/CHANGELOG.md b/CHANGELOG.md
index c720233..eec454f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,21 @@ B站评论助手 版本历史。下载：https://dl.88531.cn/bili.html　·　
 
 ---
 
+## v1.9.0 · 2026-10-14
+
+### ✨ 新功能
+- **试用策略改为 3 天 / 30 条评论，任一先到即止**：试用时长从 1 天延长到 3 天，同时设置 30 条评论上限。额度用完或时间到期，哪个先到就停哪个
+- **价值时刻提示**：每批跑完直接显示「本批 N 条已发布，平均间隔 X 秒」，并同步刷新顶部横幅的剩余条数——让用户亲眼看到成果的同时看到还剩多少
+- **到期后 24 小时折扣窗口**：试用结束后 24 小时内，面板横幅显示「24 小时内购买享 8 折」并倒计时；窗口关闭后恢复原价
+- **过期只锁评论**：试用到期后仅锁定自动评论，搜索视频、AI 生成文案、下载当前页视频继续可用，用户不会被彻底踢走
+
+### 🔧 调整
+- 顶部横幅文案：试用中显示「剩余 X 时 · 还可评论 N 条」；额度用完与时间到期分别给出不同提示
+- 试用计数只在未授权状态下累加，已激活用户不受任何影响
+- 官网与 README 同步更新试用规则、折扣窗口说明
+
+---
+
 ## v1.8.1 · 2026-10-13
 
 ### 🐛 修复
diff --git a/README.md b/README.md
index 902f70f..20eba1c 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ Chrome/Edge 浏览器插件（Manifest V3）：按**搜索关键词**找 B站视
 - ✅ 输出真正的 mp4（Blob 带 MIME + 文件头魔数校验，CDN 回网页/错误页直接报错，不会存成 txt）
 
 ### 授权与运维
-- 🔑 1 天免费试用（倒计时精确到秒），卡密激活绑定本机永久可用；**下载视频不受授权限制**
+- 🔑 3 天免费试用 / 30 条评论（任一先到即止，倒计时精确到秒并显示剩余条数），卡密激活绑定本机永久可用、不限量；试用到期后 24 小时内购买享 8 折；**过期只锁自动评论，搜索/AI 生成/下载视频不受影响**
 - 📊 安装统计上报（仅机器码 + 版本，不碰B站账号），后台可看安装数与版本分布
 - 📢 公告推送到面板顶部，有新版本时提示并跳官网
 - 🔁 可中断：随时 ⏹ 停止，停止标记跨页面刷新保留，发送前二次检查
diff --git a/background.js b/background.js
index d4c16bb..647a1f8 100644
--- a/background.js
+++ b/background.js
@@ -69,7 +69,8 @@ reportInstall(false); // SW 启动即登记一次（同一浏览器只记一条
 const AUTH_BASE = "https://auth.88531.cn/api";
 const PROJECT_NAME = "B站评论插件";
 const PROJECT_ID = 4;
-const TRIAL_MS = 24 * 3600 * 1000; // 未授权试用1天
+const TRIAL_MS = 72 * 3600 * 1000; // 未授权试用3天
+const TRIAL_COMMENT_LIMIT = 30; // 试用期内最多30条评论，用完或到期任一先到即止
 const CARD_API_KEY = "ak_ab99ed40b2296d6d2db06a4b5692b987";
 
 async function getMachineId() {
@@ -124,14 +125,21 @@ async function checkLicense() {
     offline = true; // 网络/超时 → 放行
   }
 
-  const st = await chrome.storage.local.get("trialStart");
+  const st = await chrome.storage.local.get(["trialStart", "trialComments"]);
   let trialStart = Number(st.trialStart) || 0;
   if (!trialStart) {
     trialStart = Date.now();
     await chrome.storage.local.set({ trialStart: trialStart });
   }
   const trialEnd = trialStart + TRIAL_MS;
-  const leftMs = Math.max(0, trialEnd - Date.now());
+  const now = Date.now();
+  const leftMs = Math.max(0, trialEnd - now);
+  const usedComments = Number(st.trialComments) || 0;
+  const leftComments = Math.max(0, TRIAL_COMMENT_LIMIT - usedComments);
+  // 到期后24小时内购买享8折（折扣窗口从试用到期时刻起算）
+  const discountEnd = trialEnd + 24 * 3600 * 1000;
+  const inDiscount = leftMs <= 0 && now < discountEnd;
+  const discountLeftMs = inDiscount ? discountEnd - now : 0;
 
   return {
     authorized: authorized || offline, // offline 时视为放行
@@ -141,7 +149,12 @@ async function checkLicense() {
     machine: machine,
     trialStart: trialStart,
     trialEnd: trialEnd,
-    trialLeftMs: leftMs
+    trialLeftMs: leftMs,
+    trialCommentsUsed: usedComments,
+    trialCommentsLimit: TRIAL_COMMENT_LIMIT,
+    trialCommentsLeft: leftComments,
+    inDiscount: inDiscount,
+    discountLeftMs: discountLeftMs
   };
 }
 
@@ -450,11 +463,23 @@ async function sendWithRetry(tabId, msg, tries) {
 
 async function handleStartRun(p, sendResponse) {
   try {
-    // 授权闸门：未授权且试用到期 → 拦截自动评论（下载视频不走这里，不受影响）
+    // 授权闸门：未授权时同时检查试用时长与试用条数（下载视频不走这里，不受影响）
     const lic = await checkLicense();
-    if (!lic.authorized && lic.trialLeftMs <= 0) {
-      sendResponse({ ok: false, error: "免费试用已到期，自动评论已锁定。购买卡密激活后即可继续使用（下载视频不受影响）" });
-      return;
+    if (!lic.authorized) {
+      if (lic.trialLeftMs <= 0) {
+        sendResponse({ ok: false, error: "免费试用已到期，自动评论已锁定。购买卡密激活后即可继续使用（下载视频不受影响）" });
+        return;
+      }
+      if (lic.trialCommentsLeft <= 0) {
+        sendResponse({ ok: false, error: "试用期 " + lic.trialCommentsLimit + " 条评论已用完，购买卡密激活后不限量（下载视频不受影响）" });
+        return;
+      }
+      // 试用中：把剩余额度写进任务配置，内容脚本发到额度会自动停
+      p.config = p.config || {};
+      p.config.trialQuota = lic.trialCommentsLeft;
+      if (Number(p.config.maxN) > lic.trialCommentsLeft) {
+        p.config.maxN = lic.trialCommentsLeft;
+      }
     }
     ACTIVE_TASK = null; // 本次点「开始」= 全新任务，作废残留的旧任务（旧任务会带着预生成的旧文案继续跑）
     let tab = await findBiliTab();
@@ -604,7 +629,15 @@ chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
     (async () => {
       const h = await addRecord({ bvid: msg.bvid, title: msg.title, text: msg.text, keyword: msg.keyword, ts: msg.ts });
       const s = statsOf(h);
-      sendResponse({ ok: true, stats: { total: s.total, today: s.today, week: s.week } });
+      // 试用计数：每成功发一条评论消耗一次额度（仅未授权时计数）
+      let trialCommentsLeft = null;
+      const lic = await checkLicense();
+      if (!lic.realAuthorized && !lic.offline) {
+        const used = lic.trialCommentsUsed + 1;
+        await chrome.storage.local.set({ trialComments: used });
+        trialCommentsLeft = Math.max(0, lic.trialCommentsLimit - used);
+      }
+      sendResponse({ ok: true, stats: { total: s.total, today: s.today, week: s.week }, trialCommentsLeft: trialCommentsLeft });
     })();
     return true;
   }
diff --git a/content.js b/content.js
index 3407626..ab127b0 100644
--- a/content.js
+++ b/content.js
@@ -855,7 +855,11 @@
   function finish(task, ok, reason) {
     clearTask();
     running = false;
-    relay({ type: "finished", ok: !!ok, reason: reason || "", done: task ? (task.sent || 0) : 0, failed: task ? (task.failed || 0) : 0 });
+    let avgGapSec = 0;
+    if (task && task.firstSentAt && task.lastSentAt && (task.sent || 0) >= 2) {
+      avgGapSec = Math.round((task.lastSentAt - task.firstSentAt) / ((task.sent || 1) - 1) / 1000);
+    }
+    relay({ type: "finished", ok: !!ok, reason: reason || "", done: task ? (task.sent || 0) : 0, failed: task ? (task.failed || 0) : 0, avgGapSec: avgGapSec });
     step((ok ? "✅ " : "⏹ ") + (reason || (ok ? "执行完成" : "已停止")), ok ? "ok" : "fail");
   }
 
@@ -966,6 +970,11 @@
       const doDm = (what === "dm" || what === "both");
 
       if (doComment) {
+        // 试用额度检查：发到额度就自动停，不用等用户发现
+        if (cfg.trialQuota != null && (task.sent || 0) >= cfg.trialQuota) {
+          finish(task, true, "试用期 " + cfg.trialQuota + " 条额度已用完，购买卡密激活后不限量");
+          return;
+        }
         step("评论[" + (SRC_LABEL[video.src] || "模板") + "]：" + text.slice(0, 30) + (text.length > 30 ? "…" : ""));
 
         const r = await sendOne(video, text, cfg.sendMode !== "api");
@@ -974,6 +983,8 @@
 
         if (r.ok) {
           step(r.verified ? "✅ 评论成功" : "⚠️ 已发送但未在页面确认，记为已评论", r.verified ? "ok" : "fail");
+          if (!task.firstSentAt) task.firstSentAt = Date.now();
+          task.lastSentAt = Date.now();
           await recordOne(task, video, text, true);
         } else {
           step("❌ 失败：" + r.error, "fail");
diff --git a/manifest.json b/manifest.json
index 271a4d9..b3eb1af 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "B站评论助手",
-  "version": "1.8.1",
+  "version": "1.9.0",
   "description": "B站网页版关键词评论助手：按搜索关键词找视频，默认模拟真人（打开视频页、滚到评论区、逐字输入、点发布），也可快速API直发；支持下载当前页视频；带防重复记录、可中断执行与页面实时进度浮层。",
   "permissions": ["storage", "tabs", "scripting", "sidePanel", "downloads", "declarativeNetRequest"],
   "host_permissions": [
diff --git a/sidepanel.js b/sidepanel.js
index f9a5f8a..e9191b8 100644
--- a/sidepanel.js
+++ b/sidepanel.js
@@ -157,11 +157,25 @@ function refreshCustomVisibility() {
       sub.textContent = "感谢支持！全部功能可用";
       actRow.style.display = "none";
       if (buy) buy.style.display = "none";
-    } else if (lic.trialLeftMs > 0) {
+    } else if (lic.trialLeftMs > 0 && lic.trialCommentsLeft > 0) {
       icon.textContent = "🎁";
-      text.textContent = "免费试用中 · 剩余 " + fmtRemain(lic.trialLeftMs);
+      text.textContent = "免费试用中 · 剩余 " + fmtRemain(lic.trialLeftMs) + " · 还可评论 " + lic.trialCommentsLeft + " 条";
       text.style.color = "#e67e22";
-      sub.textContent = "未授权可试用 1 天，购买卡密激活后不限时使用";
+      sub.textContent = "未授权可试用 3 天 / 30 条评论，购买卡密激活后不限时不限量";
+      actRow.style.display = "flex";
+      if (buy) buy.style.display = "";
+    } else if (lic.trialLeftMs > 0 && lic.trialCommentsLeft <= 0) {
+      icon.textContent = "🎁";
+      text.textContent = "试用期 " + lic.trialCommentsLimit + " 条评论已用完";
+      text.style.color = "#e67e22";
+      sub.textContent = "剩余时间还有效，但评论额度已用完；购买卡密激活后不限量（下载视频不受影响）";
+      actRow.style.display = "flex";
+      if (buy) buy.style.display = "";
+    } else if (lic.inDiscount) {
+      icon.textContent = "⏰";
+      text.textContent = "试用已到期 · 24 小时内购买享 8 折（剩 " + fmtRemain(lic.discountLeftMs) + "）";
+      text.style.color = "#e67e22";
+      sub.textContent = "折扣窗口关闭后恢复原价，别错过";
       actRow.style.display = "flex";
       if (buy) buy.style.display = "";
     } else {
@@ -180,7 +194,7 @@ function refreshCustomVisibility() {
     licState.trialLeftMs = Math.max(0, left);
     if (left <= 0) { renderLicense(); if (licTimer) { clearInterval(licTimer); licTimer = null; } return; }
     const text = $("licText");
-    if (text) text.textContent = "免费试用中 · 剩余 " + fmtRemain(left);
+    if (text) text.textContent = "免费试用中 · 剩余 " + fmtRemain(left) + " · 还可评论 " + licState.trialCommentsLeft + " 条";
   }
 
   async function loadLicense() {
@@ -517,9 +531,15 @@ function refreshCustomVisibility() {
   function onFinished(ev) {
     setRunning(false);
     if (ev.ok) {
-      const msg = "执行完成：成功 " + (ev.done || 0) + " 条" + (ev.failed ? "，失败 " + ev.failed + " 条" : "");
+      let msg = "本批 " + (ev.done || 0) + " 条已发布";
+      if (ev.avgGapSec > 0) msg += "，平均间隔 " + ev.avgGapSec + " 秒";
+      if (ev.failed) msg += "，失败 " + ev.failed + " 条";
       setStatus(msg);
-      log("✅ " + msg, "ok");
+      log("🎉 " + msg, "ok");
+      // 试用中：刷新授权横幅，让用户立刻看到剩余额度
+      if (licState && !licState.authorized && !licState.offline) {
+        loadLicense();
+      }
     } else {
       const msg = ev.reason || "执行未完成";
       setStatus(msg, true);