diff --git a/.gitignore b/.gitignore
index 1b7a73a..cc10aef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,8 +14,8 @@
 /coverage
 
 # next.js
-/.next/
-/out/
+.next/
+out/
 
 # production
 /build
diff --git a/app/[locale]/course/[moduleIndex]/[lessonIndex]/page.tsx b/app/[locale]/course/[moduleIndex]/[lessonIndex]/page.tsx
index dc1c297..85c71f8 100644
--- a/app/[locale]/course/[moduleIndex]/[lessonIndex]/page.tsx
+++ b/app/[locale]/course/[moduleIndex]/[lessonIndex]/page.tsx
@@ -6,7 +6,7 @@ import { Link, useTranslation } from "@/i18n/navigation";
 import { VideoPlayer } from "@/app/components/course/VideoPlayer";
 import { LessonMarkdown } from "./LessonMarkdown";
 import { getLesson } from "@/config/lessons";
-import { canWatchLesson } from "@/app/lib/course-payment";
+import { canWatchLesson, isFreeTrial } from "@/app/lib/course-payment";
 import { useAuthAndVip } from "@/app/lib/useAuthAndVip";
 import { getStoredToken, getStoredUser } from "@/app/lib/pocketbase";
 import { setLastWatched, markCompleted } from "@/app/lib/learning";
@@ -31,7 +31,6 @@ export default function LessonPage() {
 
   const lesson = getLesson(moduleIndex, lessonIndex);
   const unlocked = canWatchLesson(moduleIndex, lessonIndex, vip);
-  const isFreeTrial = moduleIndex === 0 && lessonIndex < 2;
 
   useEffect(() => {
     if (lesson && unlocked) setLastWatched(moduleIndex, lessonIndex, lesson.name);
@@ -146,7 +145,7 @@ export default function LessonPage() {
 
           <h1 className="mb-2 flex items-center gap-2 text-xl font-bold sm:text-2xl md:text-3xl">
             {lesson.name}
-            {isFreeTrial && (
+            {isFreeTrial(moduleIndex, lessonIndex) && (
               <span className="rounded bg-[var(--accent)]/20 px-2 py-0.5 text-sm font-normal text-[var(--accent)]">
                 试看
               </span>
diff --git a/app/components/course/CurriculumSection.tsx b/app/components/course/CurriculumSection.tsx
index a7eed9e..054cc10 100644
--- a/app/components/course/CurriculumSection.tsx
+++ b/app/components/course/CurriculumSection.tsx
@@ -4,7 +4,7 @@ import { useState, useEffect } from "react";
 import { Link } from "@/i18n/navigation";
 import { Section } from "./Section";
 import { CURRICULUM_CONFIG } from "@/config/course";
-import { canWatchLesson } from "@/app/lib/course-payment";
+import { canWatchLesson, isFreeTrial } from "@/app/lib/course-payment";
 import { useAuthAndVip } from "@/app/lib/useAuthAndVip";
 import { isBookmarked, toggleBookmark, getBookmarks, getCompletedLessons } from "@/app/lib/learning";
 
@@ -99,7 +99,6 @@ export function CurriculumSection() {
               {isOpen && (
                 <ul className="border-t border-[var(--border)]">
                   {c.lessons.map((l) => {
-                    const free = l.moduleIndex === 0 && l.lessonIndex < 2;
                     const unlocked = canWatchLesson(l.moduleIndex, l.lessonIndex, vip);
                     const key = `${l.moduleIndex}-${l.lessonIndex}`;
                     const bookmarked = isBookmarked(l.moduleIndex, l.lessonIndex);
@@ -126,7 +125,7 @@ export function CurriculumSection() {
                             <span className={unlocked ? "text-[var(--foreground)]" : "text-[var(--muted-foreground)]"}>
                               {l.name}
                             </span>
-                            {free && (
+                            {isFreeTrial(l.moduleIndex, l.lessonIndex) && (
                               <span className="shrink-0 rounded bg-[var(--accent)]/20 px-1.5 py-0.5 text-xs text-[var(--accent)]">
                                 试看
                               </span>
diff --git a/app/lib/course-payment.ts b/app/lib/course-payment.ts
index 0173a74..93b57ec 100644
--- a/app/lib/course-payment.ts
+++ b/app/lib/course-payment.ts
@@ -3,9 +3,8 @@
  * 与 join 报名支付分离，课程解锁用 VIP 状态
  */
 
-/** 前 2 章为试看，无需支付 */
-export function isFreeTrial(moduleIndex: number, lessonIndex: number): boolean {
-  if (moduleIndex === 0 && lessonIndex < 2) return true;
+/** 前 2 章试看（暂时关闭，全部需 VIP 解锁） */
+export function isFreeTrial(_moduleIndex: number, _lessonIndex: number): boolean {
   return false;
 }
 
diff --git a/config/course.ts b/config/course.ts
index ac927a5..44c86d8 100644
--- a/config/course.ts
+++ b/config/course.ts
@@ -185,7 +185,7 @@ export const FAQ_CONFIG = {
   title: "常见问题",
   items: [
     { q: "课程可以永久回看吗？", a: "可以，报名后永久有效，随时回看。" },
-    { q: "适合零基础吗？", a: "适合。课程从入门到进阶，前 2 节可免费试看。" },
+    { q: "适合零基础吗？", a: "适合。课程从入门到进阶；视频试看暂时关闭，报名后可解锁全部章节。" },
     { q: "有社群答疑吗？", a: "有，报名后加入专属社群，导师和同学一起交流。" },
     { q: "支持退款吗？", a: "7 天内不满意可申请全额退款。" },
   ],
diff --git a/next.config.ts b/next.config.ts
index 20e4381..f9987d4 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -1,8 +1,22 @@
 import type { NextConfig } from "next";
 
+/** 由 scripts/build-safe.cjs 设置；在 VPS 上也可手动 export 后执行 pnpm build */
+const lowMemBuild = process.env.NEXT_BUILD_LOW_MEM === "1";
+
 const nextConfig: NextConfig = {
   experimental: {
     serverActions: { bodySizeLimit: "25mb" },
+    ...(lowMemBuild
+      ? {
+          // 限制并行与预渲染并发，降低峰值内存（Next 16 默认 Turbopack 构建）
+          cpus: 1,
+          turbopackMemoryLimit: 1536 * 1024 * 1024,
+          staticGenerationMaxConcurrency: 1,
+          webpackMemoryOptimizations: true,
+          parallelServerCompiles: false,
+          parallelServerBuildTraces: false,
+        }
+      : {}),
   },
   async headers() {
     const noCacheHeaders = [
diff --git a/package.json b/package.json
index b37f5cb..4691871 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000 -H 0.0.0.0",
-    "build": "next build",
+    "build": "node ./scripts/build-safe.cjs",
     "start": "next start",
     "lint": "eslint"
   },
diff --git a/scripts/build-safe.cjs b/scripts/build-safe.cjs
new file mode 100644
index 0000000..59737e5
--- /dev/null
+++ b/scripts/build-safe.cjs
@@ -0,0 +1,30 @@
+/**
+ * 低端 VPS / 小内存环境：限制 Node 堆、开启 Next 低内存构建选项。
+ * 用法：pnpm build（默认经本脚本）
+ * 可选环境变量：
+ *   NEXT_BUILD_HEAP_MB — Node --max-old-space-size（默认 1536）
+ */
+const { spawnSync } = require("child_process");
+const path = require("path");
+
+const heapMb = process.env.NEXT_BUILD_HEAP_MB || "1536";
+const nextBin = path.join(
+  path.dirname(require.resolve("next/package.json")),
+  "dist",
+  "bin",
+  "next"
+);
+
+const result = spawnSync(
+  process.execPath,
+  ["--max-old-space-size=" + heapMb, nextBin, "build"],
+  {
+    stdio: "inherit",
+    env: {
+      ...process.env,
+      NEXT_BUILD_LOW_MEM: "1",
+    },
+  }
+);
+
+process.exit(result.status ?? 1);