'优化课程'

app/components/course/AudienceSection.tsx

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+import { Section } from "./Section";
+import { AUDIENCE_CONFIG } from "@/config/course";
+
+export function AudienceSection() {
+  return (
+    <Section>
+      <h2 className="mb-4 text-center text-xl font-bold sm:text-2xl md:text-3xl">
+        {AUDIENCE_CONFIG.title}
+      </h2>
+      <p className="mb-10 text-center text-[var(--muted-foreground)] sm:mb-12 md:mb-16">
+        {AUDIENCE_CONFIG.subtitle}
+      </p>
+      <div className="grid gap-4 sm:grid-cols-2 sm:gap-6 lg:grid-cols-4">
+        {AUDIENCE_CONFIG.items.map((a) => (
+          <div
+            key={a.title}
+            className="hover-shimmer rounded-xl border border-[var(--border)] bg-[var(--card)] p-4 transition-all duration-300 hover:border-[var(--accent)]/30 hover:bg-[var(--muted)] hover:-translate-y-0.5 sm:rounded-2xl sm:p-6"
+          >
+            <div className="mb-3 text-2xl sm:mb-4 sm:text-3xl">{a.emoji}</div>
+            <h3 className="mb-2 font-semibold">{a.title}</h3>
+            <p className="text-sm text-[var(--muted-foreground)]">{a.desc}</p>
+          </div>
+        ))}
+      </div>
+    </Section>
+  );
+}

app/components/course/BenefitsSection.tsx

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+import { Section } from "./Section";
+import { BENEFITS_CONFIG } from "@/config/course";
+
+export function BenefitsSection() {
+  return (
+    <Section>
+      <h2 className="mb-4 text-center text-xl font-bold sm:text-2xl md:text-3xl">
+        {BENEFITS_CONFIG.title}
+      </h2>
+      <p className="mb-10 text-center text-[var(--muted-foreground)] sm:mb-12 md:mb-16">
+        {BENEFITS_CONFIG.subtitle}
+      </p>
+      <div className="space-y-4 sm:space-y-6">
+        {BENEFITS_CONFIG.items.map((b) => (
+          <div
+            key={b.num}
+            className="hover-shimmer flex flex-col gap-4 rounded-xl border border-[var(--border)] bg-[var(--card)] p-4 transition-all duration-300 hover:border-[var(--accent)]/30 hover:-translate-y-0.5 sm:flex-row sm:gap-6 sm:rounded-2xl sm:p-6"
+          >
+            <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-[var(--accent-muted)] text-base font-bold text-[var(--accent)] sm:h-12 sm:w-12 sm:text-lg">
+              {b.num}
+            </div>
+            <div className="min-w-0 flex-1">
+              <h3 className="mb-1 font-semibold">{b.title}</h3>
+              <p className="text-sm text-[var(--muted-foreground)]">{b.desc}</p>
+            </div>
+          </div>
+        ))}
+      </div>
+    </Section>
+  );
+}

app/components/course/CTASection.tsx

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+"use client";
+
+import { useState, useEffect } from "react";
+import { Link } from "@/i18n/navigation";
+import { CTA_CONFIG } from "@/config/course";
+import { isPaid } from "@/app/lib/course-payment";
+
+export function CTASection() {
+  const [paid, setPaid] = useState(false);
+  useEffect(() => {
+    setPaid(isPaid());
+    const onPayUpdate = () => setPaid(isPaid());
+    window.addEventListener("pay:updated", onPayUpdate);
+    return () => window.removeEventListener("pay:updated", onPayUpdate);
+  }, []);
+
+  return (
+    <section className="border-t border-[var(--border)] py-16 sm:py-20 md:py-24">
+      <div className="mx-auto max-w-3xl px-4 text-center sm:px-6">
+        <h2 className="mb-4 text-xl font-bold sm:text-2xl md:text-3xl">
+          {CTA_CONFIG.title}
+        </h2>
+        <p className="mb-6 text-[var(--muted-foreground)] sm:mb-8">
+          {CTA_CONFIG.subtitle}
+        </p>
+        <div className="mb-8 flex flex-wrap justify-center gap-4 text-sm text-[var(--muted-foreground)] sm:mb-10 sm:gap-6">
+          {CTA_CONFIG.badges.map((b, i) => (
+            <span
+              key={b}
+              className="animate-float-badge rounded-full border border-[var(--border)] bg-[var(--card)] px-4 py-2"
+              style={{ animationDelay: `${i * 0.2}s` }}
+            >
+              {b}
+            </span>
+          ))}
+        </div>
+        <Link
+          href={paid ? "/course/0/0" : "/join"}
+          className="inline-flex items-center gap-2 rounded-full bg-[var(--accent)] px-8 py-4 text-lg font-semibold text-[var(--accent-foreground)] shadow-lg shadow-[var(--accent)]/25 transition-all duration-300 hover:scale-105 hover:opacity-95 hover:shadow-xl hover:shadow-[var(--accent)]/30 sm:px-10"
+        >
+          {paid ? "开始学习 →" : "立即加入 →"}
+        </Link>
+      </div>
+    </section>
+  );
+}

app/components/course/CourseHero.tsx

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+"use client";
+
+import { useState, useEffect } from "react";
+import { Link } from "@/i18n/navigation";
+import { HERO_CONFIG, CURRICULUM_CONFIG } from "@/config/course";
+import { isPaid } from "@/app/lib/course-payment";
+import { getLastWatched, getProgress } from "@/app/lib/learning";
+
+const TOTAL_LESSONS = CURRICULUM_CONFIG.modules.reduce((s, m) => s + m.lessons.length, 0);
+
+export function CourseHero() {
+  const [paid, setPaid] = useState(false);
+  const [last, setLast] = useState<ReturnType<typeof getLastWatched>>(null);
+  const [progress, setProgress] = useState({ completed: 0, percent: 0 });
+
+  useEffect(() => {
+    setPaid(isPaid());
+    setLast(getLastWatched());
+    setProgress(getProgress(TOTAL_LESSONS));
+    const onPay = () => setPaid(isPaid());
+    const onProgress = () => {
+      setLast(getLastWatched());
+      setProgress(getProgress(TOTAL_LESSONS));
+    };
+    window.addEventListener("pay:updated", onPay);
+    window.addEventListener("learning:progress", onProgress);
+    return () => {
+      window.removeEventListener("pay:updated", onPay);
+      window.removeEventListener("learning:progress", onProgress);
+    };
+  }, []);
+
+  return (
+    <section className="relative overflow-hidden pt-24 pb-16 sm:pt-28 sm:pb-20 md:pt-32 md:pb-24">
+      <div className="absolute inset-0 bg-[radial-gradient(ellipse_80%_50%_at_50%_-20%,var(--gradient-accent),transparent)] animate-gradient" />
+      <div className="relative mx-auto max-w-4xl px-4 text-center sm:px-6">
+        <h1 className="mb-4 text-3xl font-bold tracking-tight sm:text-4xl md:text-5xl lg:text-6xl">
+          {HERO_CONFIG.title}
+        </h1>
+        <p className="mb-10 text-lg text-[var(--muted-foreground)] sm:mb-12 sm:text-xl md:text-2xl">
+          {HERO_CONFIG.subtitle}
+        </p>
+        <div className="mb-10 flex flex-wrap justify-center gap-6 sm:mb-12 sm:gap-8">
+          {HERO_CONFIG.stats.map((s) => (
+            <div key={s.label} className="text-center transition-transform duration-300 hover:scale-105">
+              <div className="text-2xl font-bold text-[var(--accent)] sm:text-3xl md:text-4xl">
+                {s.value}
+              </div>
+              <div className="mt-1 text-xs text-[var(--muted-foreground)] sm:text-sm">
+                {s.label}
+              </div>
+            </div>
+          ))}
+        </div>
+        <div className="flex flex-wrap justify-center gap-3 sm:gap-4">
+          {paid && last ? (
+            <Link
+              href={`/course/${last.moduleIndex}/${last.lessonIndex}`}
+              className="inline-flex shrink-0 items-center gap-2 rounded-full bg-[var(--accent)] px-8 py-4 text-lg font-semibold text-[var(--accent-foreground)] transition hover:opacity-90 sm:px-10"
+            >
+              继续学习 →
+            </Link>
+          ) : (
+            <Link
+              href={paid ? "/course/0/0" : "/join"}
+              className="inline-flex shrink-0 items-center gap-2 rounded-full bg-[var(--accent)] px-8 py-4 text-lg font-semibold text-[var(--accent-foreground)] transition hover:opacity-90 sm:px-10"
+            >
+              {paid ? "进入课程 →" : "立即报名 →"}
+            </Link>
+          )}
+        </div>
+        {paid && progress.completed > 0 && (
+          <div className="mt-6 w-full max-w-xs">
+            <div className="mb-1 flex justify-between text-xs text-[var(--muted-foreground)]">
+              <span>学习进度</span>
+              <span>{progress.completed}/{TOTAL_LESSONS} 节</span>
+            </div>
+            <div className="h-2 overflow-hidden rounded-full bg-[var(--muted)]">
+              <div
+                className="h-full rounded-full bg-[var(--accent)] transition-all"
+                style={{ width: `${progress.percent}%` }}
+              />
+            </div>
+          </div>
+        )}
+      </div>
+    </section>
+  );
+}

app/components/course/CurriculumSection.tsx

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+"use client";
+
+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 { isBookmarked, toggleBookmark, getBookmarks, getCompletedLessons } from "@/app/lib/learning";
+
+export function CurriculumSection() {
+  const [expanded, setExpanded] = useState<Record<number, boolean>>(() =>
+    Object.fromEntries(CURRICULUM_CONFIG.modules.map((_, i) => [i, i === 0]))
+  );
+  const [search, setSearch] = useState("");
+  const [bookmarks, setBookmarks] = useState<Set<string>>(new Set());
+  const [completed, setCompleted] = useState<Set<string>>(new Set());
+
+  useEffect(() => {
+    setBookmarks(getBookmarks());
+    setCompleted(getCompletedLessons());
+    const onB = () => setBookmarks(getBookmarks());
+    const onP = () => setCompleted(getCompletedLessons());
+    window.addEventListener("learning:bookmarks", onB);
+    window.addEventListener("learning:progress", onP);
+    return () => {
+      window.removeEventListener("learning:bookmarks", onB);
+      window.removeEventListener("learning:progress", onP);
+    };
+  }, []);
+
+  const toggle = (i: number) => {
+    setExpanded((prev) => ({ ...prev, [i]: !prev[i] }));
+  };
+
+  const allLessons = CURRICULUM_CONFIG.modules.flatMap((m, mi) =>
+    m.lessons.map((l, li) => ({ moduleIndex: mi, lessonIndex: li, ...l, moduleTitle: m.title }))
+  );
+  const filtered = search.trim()
+    ? allLessons.filter(
+        (l) =>
+          l.name.toLowerCase().includes(search.toLowerCase()) ||
+          l.moduleTitle.toLowerCase().includes(search.toLowerCase())
+      )
+    : allLessons;
+
+  const filteredByModule = CURRICULUM_CONFIG.modules
+    .map((m, mi) => ({
+      ...m,
+      lessons: filtered.filter((l) => l.moduleIndex === mi),
+    }))
+    .filter((m) => m.lessons.length > 0);
+
+  return (
+    <Section>
+      <h2 className="mb-4 text-center text-xl font-bold sm:text-2xl md:text-3xl">
+        {CURRICULUM_CONFIG.title}
+      </h2>
+      <p className="mb-6 text-center text-[var(--muted-foreground)] sm:mb-8 md:mb-10">
+        {CURRICULUM_CONFIG.subtitle}
+      </p>
+      <div className="mx-auto mb-8 max-w-md">
+        <input
+          type="search"
+          placeholder="搜索课程..."
+          value={search}
+          onChange={(e) => setSearch(e.target.value)}
+          className="w-full rounded-full border border-[var(--border)] bg-[var(--background)] px-4 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-[var(--accent)]"
+        />
+      </div>
+      <div className="space-y-2 md:space-y-3">
+        {filteredByModule.map((c) => {
+          const moduleIndex = CURRICULUM_CONFIG.modules.findIndex((m) => m.title === c.title);
+          const isOpen = expanded[moduleIndex] ?? true;
+          return (
+            <div
+              key={c.title}
+              className="overflow-hidden rounded-xl border border-[var(--border)] bg-[var(--card)] md:rounded-2xl"
+            >
+              <button
+                type="button"
+                onClick={() => toggle(moduleIndex)}
+                className="flex w-full items-center justify-between gap-3 px-4 py-3 text-left transition hover:bg-[var(--muted)] sm:px-5 sm:py-4"
+              >
+                <span className="flex items-center gap-2 text-base font-semibold sm:text-lg">
+                  <span
+                    className={`transition-transform duration-200 ${isOpen ? "rotate-90" : ""}`}
+                  >
+                    ▶
+                  </span>
+                  <span>{c.emoji}</span>
+                  {c.title}
+                </span>
+                <span className="text-sm text-[var(--muted-foreground)]">
+                  {c.lessons.length} 节
+                </span>
+              </button>
+              {isOpen && (
+                <ul className="border-t border-[var(--border)]">
+                  {c.lessons.map((l) => {
+                    const free = l.moduleIndex === 0 && l.lessonIndex < 2;
+                    const unlocked = canWatchLesson(l.moduleIndex, l.lessonIndex);
+                    const key = `${l.moduleIndex}-${l.lessonIndex}`;
+                    const bookmarked = isBookmarked(l.moduleIndex, l.lessonIndex);
+                    const isCompleted = completed.has(key);
+                    return (
+                      <li key={key}>
+                        <Link
+                          href={`/course/${l.moduleIndex}/${l.lessonIndex}`}
+                          className="flex flex-col gap-1 px-4 py-3 transition hover:bg-[var(--muted)] sm:flex-row sm:items-center sm:justify-between sm:px-5 sm:py-3"
+                        >
+                          <span className="flex items-center gap-2 truncate sm:gap-3">
+                            <button
+                              type="button"
+                              onClick={(e) => {
+                                e.preventDefault();
+                                e.stopPropagation();
+                                toggleBookmark(l.moduleIndex, l.lessonIndex);
+                              }}
+                              className="shrink-0 text-xs"
+                              aria-label={bookmarked ? "取消收藏" : "收藏"}
+                            >
+                              {bookmarked ? "⭐" : "☆"}
+                            </button>
+                            <span className={unlocked ? "text-[var(--foreground)]" : "text-[var(--muted-foreground)]"}>
+                              {l.name}
+                            </span>
+                            {free && (
+                              <span className="shrink-0 rounded bg-[var(--accent)]/20 px-1.5 py-0.5 text-xs text-[var(--accent)]">
+                                试看
+                              </span>
+                            )}
+                            {isCompleted && (
+                              <span className="shrink-0 rounded bg-green-500/20 px-1.5 py-0.5 text-xs text-green-600 dark:text-green-400">
+                                ✓
+                              </span>
+                            )}
+                            {!unlocked && (
+                              <span className="shrink-0 text-xs text-[var(--muted-foreground)]">
+                                🔒
+                              </span>
+                            )}
+                          </span>
+                          <span className="flex shrink-0 items-center gap-2 text-xs text-[var(--muted-foreground)] sm:text-sm">
+                            {l.duration}
+                            <span className="text-[var(--accent)]">→</span>
+                          </span>
+                        </Link>
+                      </li>
+                    );
+                  })}
+                </ul>
+              )}
+            </div>
+          );
+        })}
+      </div>
+    </Section>
+  );
+}

app/components/course/FAQSection.tsx

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+"use client";
+
+import { useState } from "react";
+import { Section } from "./Section";
+import { FAQ_CONFIG } from "@/config/course";
+
+export function FAQSection() {
+  const [openIndex, setOpenIndex] = useState<number | null>(null);
+
+  return (
+    <Section>
+      <h2 className="mb-10 text-center text-xl font-bold sm:text-2xl md:text-3xl">
+        {FAQ_CONFIG.title}
+      </h2>
+      <div className="mx-auto max-w-2xl space-y-2">
+        {FAQ_CONFIG.items.map((item, i) => (
+          <div
+            key={i}
+            className="overflow-hidden rounded-xl border border-[var(--border)] bg-[var(--card)] transition"
+          >
+            <button
+              type="button"
+              onClick={() => setOpenIndex(openIndex === i ? null : i)}
+              className="flex w-full items-center justify-between gap-3 px-4 py-3 text-left transition hover:bg-[var(--muted)] sm:px-5"
+            >
+              <span className="font-medium">{item.q}</span>
+              <span
+                className={`shrink-0 text-[var(--muted-foreground)] transition-transform ${openIndex === i ? "rotate-180" : ""}`}
+              >
+                ▼
+              </span>
+            </button>
+            {openIndex === i && (
+              <div className="border-t border-[var(--border)] px-4 py-3 text-sm text-[var(--muted-foreground)] sm:px-5">
+                {item.a}
+              </div>
+            )}
+          </div>
+        ))}
+      </div>
+    </Section>
+  );
+}

app/components/course/InstructorsSection.tsx

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+import { Section } from "./Section";
+import { INSTRUCTORS_CONFIG } from "@/config/course";
+
+export function InstructorsSection() {
+  return (
+    <Section>
+      <h2 className="mb-4 text-center text-xl font-bold sm:text-2xl md:text-3xl">
+        {INSTRUCTORS_CONFIG.title}
+      </h2>
+      <p className="mb-10 text-center text-[var(--muted-foreground)] sm:mb-12 md:mb-16">
+        {INSTRUCTORS_CONFIG.subtitle}
+      </p>
+      <div className="grid gap-6 sm:grid-cols-2 md:gap-8 lg:grid-cols-3">
+        {INSTRUCTORS_CONFIG.items.map((i) => (
+          <div
+            key={i.name}
+            className="hover-shimmer rounded-xl border border-[var(--border)] bg-[var(--card)] p-5 text-center transition-all duration-300 hover:-translate-y-0.5 hover:border-[var(--accent)]/30 sm:rounded-2xl sm:p-6"
+          >
+            <div className="mb-3 flex justify-center sm:mb-4">
+              <div className="flex h-16 w-16 items-center justify-center rounded-full bg-[var(--accent-muted)] text-xl font-bold text-[var(--accent)] sm:h-20 sm:w-20 sm:text-2xl">
+                {i.name.slice(0, 1)}
+              </div>
+            </div>
+            <h3 className="mb-1 font-semibold">{i.name}</h3>
+            <p className="mb-1 text-sm text-[var(--accent)]">{i.role}</p>
+            <p className="mb-2 text-sm text-[var(--muted-foreground)]">
+              {i.desc}
+            </p>
+            <span className="inline-block rounded-full bg-[var(--accent-muted)] px-3 py-1 text-xs text-[var(--accent)]">
+              {i.tag}
+            </span>
+          </div>
+        ))}
+      </div>
+    </Section>
+  );
+}

app/components/course/Section.tsx

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+import { type ReactNode } from "react";
+
+type SectionProps = {
+  children: ReactNode;
+  className?: string;
+};
+
+/** 通用区块容器 - 统一内边距与最大宽度，响应式（来自 nomadlms） */
+export function Section({ children, className = "" }: SectionProps) {
+  return (
+    <section
+      className={`border-t border-[var(--border)] py-12 md:py-16 lg:py-20 ${className}`}
+    >
+      <div className="mx-auto max-w-6xl px-4 sm:px-6">{children}</div>
+    </section>
+  );
+}

app/components/course/VideoPlayer.tsx

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+"use client";
+
+import { useCallback, useEffect, useRef, useState } from "react";
+
+const STORAGE_PREFIX = "lms-video-";
+const SAVE_INTERVAL = 5000;
+const MIN_PROGRESS_TO_SHOW = 10;
+
+function getStoredProgress(videoId: string): number {
+  if (typeof window === "undefined") return 0;
+  try {
+    const raw = localStorage.getItem(`${STORAGE_PREFIX}${videoId}`);
+    if (!raw) return 0;
+    const data = JSON.parse(raw);
+    return typeof data?.time === "number" ? data.time : 0;
+  } catch {
+    return 0;
+  }
+}
+
+function saveProgress(videoId: string, time: number): void {
+  if (typeof window === "undefined") return;
+  try {
+    localStorage.setItem(`${STORAGE_PREFIX}${videoId}`, JSON.stringify({ time }));
+  } catch {
+    /* ignore */
+  }
+}
+
+type VideoPlayerProps = {
+  src: string;
+  poster?: string;
+  title?: string;
+  className?: string;
+  videoId?: string;
+  onComplete?: () => void;
+};
+
+export function VideoPlayer({ src, poster, title, className = "", videoId, onComplete }: VideoPlayerProps) {
+  const videoRef = useRef<HTMLVideoElement>(null);
+  const [playing, setPlaying] = useState(false);
+  const [progress, setProgress] = useState(0);
+  const [currentTime, setCurrentTime] = useState(0);
+  const [duration, setDuration] = useState(0);
+  const [volume, setVolume] = useState(1);
+  const [muted, setMuted] = useState(false);
+  const [speed, setSpeed] = useState(1);
+  const [showControls, setShowControls] = useState(true);
+  const [showResumePrompt, setShowResumePrompt] = useState(false);
+  const [savedTime, setSavedTime] = useState(0);
+  const hideTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const lastSaveRef = useRef(0);
+
+  const togglePlay = useCallback(() => {
+    const v = videoRef.current;
+    if (!v) return;
+    if (v.paused) {
+      v.play();
+      setPlaying(true);
+    } else {
+      v.pause();
+      setPlaying(false);
+    }
+  }, []);
+
+  const handleTimeUpdate = useCallback(() => {
+    const v = videoRef.current;
+    if (!v) return;
+    const time = v.currentTime;
+    const dur = v.duration;
+    setCurrentTime(time);
+    setProgress(Number.isFinite(dur) && dur > 0 ? (time / dur) * 100 : 0);
+
+    if (videoId && v.currentTime > 0) {
+      const now = Date.now();
+      if (now - lastSaveRef.current > SAVE_INTERVAL) {
+        lastSaveRef.current = now;
+        saveProgress(videoId, v.currentTime);
+      }
+    }
+  }, [videoId]);
+
+  const handleLoadedMetadata = useCallback(() => {
+    const v = videoRef.current;
+    if (!v) return;
+    const dur = v.duration;
+    if (!Number.isFinite(dur) || dur <= 0) return;
+    setDuration(dur);
+
+    if (videoId) {
+      const stored = getStoredProgress(videoId);
+      if (Number.isFinite(stored) && stored >= MIN_PROGRESS_TO_SHOW && stored < dur - 5) {
+        setSavedTime(stored);
+        setShowResumePrompt(true);
+      }
+    }
+  }, [videoId]);
+
+  const handleEnded = useCallback(() => {
+    setPlaying(false);
+    setProgress(0);
+    setCurrentTime(0);
+    if (videoId) saveProgress(videoId, 0);
+    onComplete?.();
+  }, [videoId, onComplete]);
+
+  const handlePause = useCallback(() => {
+    const v = videoRef.current;
+    if (videoId && v && v.currentTime > 0) {
+      saveProgress(videoId, v.currentTime);
+    }
+  }, [videoId]);
+
+  const handleResume = useCallback(() => {
+    const v = videoRef.current;
+    if (!v || savedTime <= 0) return;
+    const dur = v.duration;
+    if (!Number.isFinite(dur) || dur <= 0) return;
+    const time = Math.min(savedTime, dur - 0.1);
+    v.currentTime = time;
+    setCurrentTime(time);
+    setProgress((time / dur) * 100);
+    v.play();
+    setPlaying(true);
+    setShowResumePrompt(false);
+  }, [savedTime]);
+
+  const handleRestart = useCallback(() => {
+    const v = videoRef.current;
+    if (!v) return;
+    if (videoId) saveProgress(videoId, 0);
+    v.currentTime = 0;
+    setCurrentTime(0);
+    setProgress(0);
+    setShowResumePrompt(false);
+  }, [videoId]);
+
+  const handleSeek = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
+    const v = videoRef.current;
+    if (!v) return;
+    const dur = v.duration;
+    if (!Number.isFinite(dur) || dur <= 0) return;
+    const rect = e.currentTarget.getBoundingClientRect();
+    if (rect.width <= 0) return;
+    const p = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width));
+    const time = p * dur;
+    v.currentTime = time;
+    setCurrentTime(time);
+    setProgress(p * 100);
+  }, []);
+
+  const toggleMute = useCallback(() => {
+    const v = videoRef.current;
+    if (!v) return;
+    v.muted = !v.muted;
+    setMuted(v.muted);
+  }, []);
+
+  const handleVolumeChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
+    const v = videoRef.current;
+    if (!v) return;
+    const val = parseFloat(e.target.value);
+    v.volume = val;
+    setVolume(val);
+    setMuted(val === 0);
+  }, []);
+
+  const cycleSpeed = useCallback(() => {
+    const speeds = [0.5, 0.75, 1, 1.25, 1.5, 1.75, 2];
+    const i = speeds.indexOf(speed);
+    const next = speeds[(i + 1) % speeds.length];
+    const v = videoRef.current;
+    if (v) v.playbackRate = next;
+    setSpeed(next);
+  }, [speed]);
+
+  const toggleFullscreen = useCallback(() => {
+    const container = videoRef.current?.parentElement;
+    if (!container) return;
+    if (!document.fullscreenElement) {
+      container.requestFullscreen();
+    } else {
+      document.exitFullscreen();
+    }
+  }, []);
+
+  const showControlsTemporarily = useCallback(() => {
+    setShowControls(true);
+    if (hideTimerRef.current) clearTimeout(hideTimerRef.current);
+    hideTimerRef.current = setTimeout(() => setShowControls(false), 3000);
+  }, []);
+
+  useEffect(() => () => { if (hideTimerRef.current) clearTimeout(hideTimerRef.current); }, []);
+
+  const formatTime = (s: number) => {
+    if (!Number.isFinite(s) || s < 0) return "0:00";
+    const m = Math.floor(s / 60);
+    const sec = Math.floor(s % 60);
+    return `${m}:${sec.toString().padStart(2, "0")}`;
+  };
+
+  const formatResumeTime = (s: number) => {
+    if (!Number.isFinite(s) || s < 0) return "0秒";
+    const m = Math.floor(s / 60);
+    const sec = Math.floor(s % 60);
+    if (m > 0) return `${m}分${sec}秒`;
+    return `${sec}秒`;
+  };
+
+  return (
+    <div
+      className={`group relative overflow-hidden rounded-xl bg-black md:rounded-2xl ${className}`}
+      onMouseMove={showControlsTemporarily}
+      onMouseLeave={() => setShowControls(false)}
+    >
+      <video
+        ref={videoRef}
+        src={src}
+        poster={poster}
+        title={title}
+        className="aspect-video w-full object-contain"
+        onClick={togglePlay}
+        onTimeUpdate={handleTimeUpdate}
+        onLoadedMetadata={handleLoadedMetadata}
+        onEnded={handleEnded}
+        onPause={handlePause}
+        playsInline
+      />
+
+      {showResumePrompt && (
+        <div className="absolute bottom-20 left-3 z-10 max-w-[280px] rounded-lg bg-black/85 px-4 py-3 shadow-xl backdrop-blur sm:left-4 sm:bottom-24">
+          <p className="mb-3 text-sm text-white/90">
+            上次看到 <span className="font-semibold text-white">{formatResumeTime(savedTime)}</span>
+          </p>
+          <div className="flex gap-2">
+            <button
+              type="button"
+              onClick={handleResume}
+              className="flex-1 rounded-md bg-[var(--accent)] px-3 py-2 text-sm font-medium text-black transition hover:opacity-90"
+            >
+              从上次继续
+            </button>
+            <button
+              type="button"
+              onClick={handleRestart}
+              className="rounded-md border border-white/30 bg-white/10 px-3 py-2 text-sm text-white transition hover:bg-white/20"
+            >
+              重新观看
+            </button>
+          </div>
+        </div>
+      )}
+
+      {!playing && (
+        <button
+          type="button"
+          onClick={togglePlay}
+          className="absolute inset-0 flex items-center justify-center bg-black/20 transition hover:bg-black/30"
+          aria-label="播放"
+        >
+          <div className="flex h-16 w-16 items-center justify-center rounded-full bg-white/90 shadow-lg transition hover:scale-110 sm:h-20 sm:w-20">
+            <svg
+              className="ml-1 h-8 w-8 text-black sm:h-10 sm:w-10"
+              fill="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path d="M8 5v14l11-7z" />
+            </svg>
+          </div>
+        </button>
+      )}
+
+      <div
+        className={`absolute bottom-0 left-0 right-0 bg-gradient-to-t from-black/90 to-transparent p-3 transition-opacity duration-300 ${
+          showControls ? "opacity-100" : "opacity-0"
+        }`}
+      >
+        <div
+          className="mb-3 h-1 cursor-pointer rounded-full bg-white/30"
+          onClick={handleSeek}
+          role="slider"
+          aria-valuenow={progress}
+        >
+          <div
+            className="h-full rounded-full bg-[var(--accent)] transition-all"
+            style={{ width: `${progress}%` }}
+          />
+        </div>
+
+        <div className="flex items-center gap-2 sm:gap-4">
+          <button
+            type="button"
+            onClick={togglePlay}
+            className="rounded p-1 text-white transition hover:bg-white/20"
+            aria-label={playing ? "暂停" : "播放"}
+          >
+            {playing ? (
+              <svg className="h-5 w-5 sm:h-6 sm:w-6" fill="currentColor" viewBox="0 0 24 24">
+                <path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z" />
+              </svg>
+            ) : (
+              <svg className="h-5 w-5 sm:h-6 sm:w-6" fill="currentColor" viewBox="0 0 24 24">
+                <path d="M8 5v14l11-7z" />
+              </svg>
+            )}
+          </button>
+
+          <span className="min-w-[4rem] text-xs text-white/90 sm:text-sm">
+            {formatTime(currentTime)} / {formatTime(duration)}
+          </span>
+
+          <div className="flex items-center gap-1">
+            <button
+              type="button"
+              onClick={toggleMute}
+              className="rounded p-1 text-white transition hover:bg-white/20"
+              aria-label={muted ? "取消静音" : "静音"}
+            >
+              {muted || volume === 0 ? (
+                <svg className="h-5 w-5 sm:h-6 sm:w-6" fill="currentColor" viewBox="0 0 24 24">
+                  <path d="M16.5 12c0-1.77-1.02-3.29-2.5-4.03v2.21l2.45 2.45c.03-.2.05-.41.05-.63zm2.5 0c0 .94-.2 1.82-.54 2.64l1.51 1.51C20.63 14.91 21 13.5 21 12c0-4.28-2.99-7.86-7-8.77v2.06c2.89.86 5 3.54 5 6.71zM4.27 3L3 4.27 7.73 9H3v6h4l5 5v-6.73l4.25 4.25c-.67.52-1.42.93-2.25 1.18v2.06c1.38-.31 2.63-.95 3.69-1.81L19.73 21 21 19.73l-9-9L4.27 3zM12 4L9.91 6.09 12 8.18V4z" />
+                </svg>
+              ) : (
+                <svg className="h-5 w-5 sm:h-6 sm:w-6" fill="currentColor" viewBox="0 0 24 24">
+                  <path d="M3 9v6h4l5 5V4L7 9H3zm13.5 3c0-1.77-1.02-3.29-2.5-4.03v8.05c1.48-.73 2.5-2.25 2.5-4.02zM14 3.23v2.06c2.89.86 5 3.54 5 6.71s-2.11 5.85-5 6.71v2.06c4.01-.91 7-4.49 7-8.77s-2.99-7.86-7-8.77z" />
+                </svg>
+              )}
+            </button>
+            <input
+              type="range"
+              min="0"
+              max="1"
+              step="0.1"
+              value={muted ? 0 : volume}
+              onChange={handleVolumeChange}
+              className="h-1 w-16 cursor-pointer accent-[var(--accent)] sm:w-20"
+            />
+          </div>
+
+          <button
+            type="button"
+            onClick={cycleSpeed}
+            className="rounded px-2 py-1 text-xs font-medium text-white/90 transition hover:bg-white/20 sm:text-sm"
+          >
+            {speed}x
+          </button>
+
+          <button
+            type="button"
+            onClick={toggleFullscreen}
+            className="ml-auto rounded p-1 text-white transition hover:bg-white/20"
+            aria-label="全屏"
+          >
+            <svg className="h-5 w-5 sm:h-6 sm:w-6" fill="currentColor" viewBox="0 0 24 24">
+              <path d="M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z" />
+            </svg>
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}

app/components/course/index.ts

@@ -0,0 +1,9 @@
+export { Section } from "./Section";
+export { VideoPlayer } from "./VideoPlayer";
+export { CurriculumSection } from "./CurriculumSection";
+export { AudienceSection } from "./AudienceSection";
+export { BenefitsSection } from "./BenefitsSection";
+export { InstructorsSection } from "./InstructorsSection";
+export { FAQSection } from "./FAQSection";
+export { CTASection } from "./CTASection";
+export { CourseHero } from "./CourseHero";