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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>M5-1 推荐算法 · Who's Choosing for Me?</title>
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</head>
<body class="grain">
<button class="lang-toggle bg-white border border-slate-200 rounded-full px-3 py-1 text-sm shadow-sm hover:shadow-md" onclick="toggleLang()" aria-label="切换语言 / Switch language">
<span data-zh>EN</span><span data-en>中</span>
</button>
<div class="max-w-5xl mx-auto px-4 sm:px-6 py-6 relative z-10">
<!-- HEADER -->
<header class="mb-6">
<div class="flex items-center gap-2 mb-2 flex-wrap">
<span class="text-xs font-semibold bg-red-100 text-red-700 px-2 py-1 rounded-full">M5-1 · Mission</span>
<span class="text-xs font-semibold bg-slate-200 text-slate-700 px-2 py-1 rounded-full">Ch.5 · 社会 / Society</span>
<span class="text-xs font-semibold bg-amber-100 text-amber-800 px-2 py-1 rounded-full"><span data-zh>热身 · 20 min</span><span data-en>Warm-up · 20 min</span></span>
</div>
<h1 class="text-3xl sm:text-4xl font-black tracking-tight leading-tight">
<span data-zh>谁在替我选:推荐算法在你身上做了什么</span>
<span data-en>Who's Choosing for Me: What Recsys Does to You</span>
</h1>
<div class="mt-4 flex items-center gap-1" id="steps">
<span class="step-dot current"></span>
<span class="step-dot"></span>
<span class="step-dot"></span>
<span class="step-dot"></span>
<span class="step-dot"></span>
<span class="step-dot"></span>
<span class="ml-3 text-xs text-slate-500" id="step-label">
<span data-zh>第 1 / 6 关</span><span data-en>Step 1 / 6</span>
</span>
</div>
</header>
<!-- ========== PHASE 0: OPENING ========== -->
<section class="phase active" id="p0">
<div class="grid md:grid-cols-[180px_1fr] gap-5 items-start">
<div class="text-center">
<img src="lingxi-avatar.png" alt="小京灵" class="lingxi-img bob mx-auto" width="160" height="160" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">
<div class="lingxi-fallback bob mx-auto" style="display:none">🧚♀️</div>
<div class="text-sm font-bold text-blue-700 mt-1"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
</div>
<div>
<div class="lingxi-bubble">
<p class="text-lg leading-relaxed" data-zh>
欢迎来到 <strong>第 5 章 · AI 与人类社会</strong>。前 4 章看 AI 怎么运作——这一章看它<strong>怎么改变你和世界的关系</strong>。
</p>
<p class="text-lg leading-relaxed" data-en>
Welcome to <strong>Chapter 5 · AI and Society</strong>. We've seen how AI works — now: <strong>how it reshapes your relationship with the world</strong>.
</p>
<p class="mt-3 leading-relaxed" data-zh>
从今天的<strong>第一个问题</strong>开始:你昨天刷了多久抖音/快手/B站/小红书?<strong>3 小时?5 小时?</strong>那 100% 的内容,<strong>都是 AI 替你选的</strong>。
</p>
<p class="mt-3 leading-relaxed" data-en>
Start with the <strong>first question</strong>: how long did you scroll TikTok/Bilibili/RedNote yesterday? <strong>3 hours? 5?</strong> 100% of what you saw was <strong>AI-selected</strong> for you.
</p>
<p class="mt-3 leading-relaxed text-red-700 font-semibold" data-zh>
今天我让你做一件事:刷一个我做的<strong>模拟短视频 APP</strong>,<strong>看 AI 怎么"了解"你</strong>——并在你眼皮底下给你"贴标签"。
</p>
<p class="mt-3 leading-relaxed text-red-700 font-semibold" data-en>
Today: scroll my <strong>simulated short-video app</strong> and <strong>watch AI "learn" you</strong> — labeling you in real time.
</p>
</div>
<div class="mt-5">
<button class="btn-primary" onclick="goTo(1)">
<span data-zh>先看数据冲击 →</span><span data-en>First, the data shock →</span>
</button>
</div>
</div>
</div>
</section>
<!-- ========== PHASE 1: DATA SHOCK ========== -->
<section class="phase" id="p1">
<div class="lingxi-bubble mb-5">
<div class="font-bold mb-1 text-blue-700"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
<p data-zh>先看 <strong>3 个数字</strong>——这是 2024 年中国互联网研究的真实统计:</p>
<p data-en>3 numbers — real 2024 China internet stats:</p>
</div>
<div class="grid sm:grid-cols-3 gap-4 mb-5">
<div class="stat-card">
<div class="stat-num text-red-600">3.2 <span class="text-base">h</span></div>
<div class="text-sm font-bold mt-1" data-zh>中学生每天平均</div>
<div class="text-sm font-bold mt-1" data-en>Avg per middle schooler</div>
<div class="text-xs text-slate-500 mt-1"><span data-zh>用短视频/社交 APP</span><span data-en>on short-video/social apps</span></div>
</div>
<div class="stat-card">
<div class="stat-num text-amber-600">100<span class="text-base">%</span></div>
<div class="text-sm font-bold mt-1" data-zh>看到的内容</div>
<div class="text-sm font-bold mt-1" data-en>Of content you see</div>
<div class="text-xs text-slate-500 mt-1"><span data-zh>由推荐算法选定</span><span data-en>is algorithm-selected</span></div>
</div>
<div class="stat-card">
<div class="stat-num text-blue-600">8<span class="text-base">亿</span></div>
<div class="text-sm font-bold mt-1" data-zh>中国短视频用户</div>
<div class="text-sm font-bold mt-1" data-en>Chinese short-video users</div>
<div class="text-xs text-slate-500 mt-1"><span data-zh>每个人都有自己的"算法茧"</span><span data-en>each in their own algo-cocoon</span></div>
</div>
</div>
<div class="bg-amber-50 border border-amber-200 rounded-xl p-4 text-sm mb-4">
<strong>🤔 <span data-zh>一个奇怪的事实</span><span data-en>Strange fact</span></strong>:
<span data-zh>你和你的同桌,<strong>同时</strong>打开抖音,看到的视频<strong>完全不一样</strong>。10 年前的电视,全国 8 亿人看的是<strong>同一个春晚</strong>。<strong>现在,8 亿人有 8 亿个"春晚"</strong>。</span>
<span data-en>You and your deskmate, <strong>same moment</strong>, opening TikTok — see <strong>completely different videos</strong>. 10 yrs ago, 800M Chinese watched <strong>the same New Year Gala</strong>. <strong>Now, 800M Galas for 800M people</strong>.</span>
</div>
<div class="mt-5 flex justify-end">
<button class="btn-primary" onclick="goTo(2)">
<span data-zh>下一关:算法的 4 步循环 →</span><span data-en>Next: algorithm's 4-step loop →</span>
</button>
</div>
</section>
<!-- ========== PHASE 2: 4-STEP LOOP ========== -->
<section class="phase" id="p2">
<div class="lingxi-bubble mb-5">
<div class="font-bold mb-1 text-blue-700"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
<p data-zh>推荐算法是怎么工作的?就是一个<strong>4 步无限循环</strong>。点开每一步看故事。</p>
<p data-en>How does recsys work? An <strong>infinite 4-step loop</strong>. Click each step.</p>
</div>
<div class="flex items-center justify-between mb-3 text-sm">
<div class="font-semibold text-slate-700"><span data-zh>已读:</span><span data-en>Read:</span><span id="algo-count">0</span> / 4</div>
</div>
<div id="algo-grid" class="grid sm:grid-cols-2 lg:grid-cols-4 gap-3 mb-5"></div>
<div class="bg-blue-50 border border-blue-200 rounded-xl p-4 text-sm">
<strong>🔄 <span data-zh>关键洞察</span><span data-en>Key insight</span></strong>:
<span data-zh>这个循环<strong>每秒都在转</strong>。你每点一下赞、每滑过一个视频,<strong>算法都在更新它对你的理解</strong>。你滑得越多,它越懂你——这听起来不错,对吧?下一关你会看到,"它懂你"<strong>不一定是好事</strong>。</span>
<span data-en>This loop <strong>spins every second</strong>. Every like, every swipe, <strong>updates AI's model of you</strong>. The more you scroll, the better it knows you — sounds nice, right? Next mission, you'll see why "knowing you" <strong>isn't always good</strong>.</span>
</div>
<div class="mt-5 flex justify-end">
<button class="btn-primary" id="p2-next" disabled onclick="goTo(3)">
<span data-zh>下一关:让算法学习你 →</span><span data-en>Next: let algo learn you →</span>
</button>
</div>
</section>
<!-- ========== PHASE 3: SIMULATED FEED ========== -->
<section class="phase" id="p3">
<div class="lingxi-bubble mb-5">
<div class="font-bold mb-1 text-blue-700"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
<p data-zh>这是我做的<strong>模拟短视频流</strong>。点 ❤️ "喜欢"或 ⏭ "跳过"——<strong>3 轮共 18 个视频</strong>。你边刷,"AI 大脑"边学。</p>
<p data-en>My <strong>simulated short-video feed</strong>. Like ❤️ or skip ⏭ — <strong>3 rounds, 18 videos total</strong>. As you scroll, "AI brain" learns.</p>
</div>
<div class="grid md:grid-cols-[1fr_280px] gap-5">
<!-- Feed -->
<div>
<div class="text-xs uppercase text-slate-500 font-bold tracking-wide mb-2 flex items-center justify-between">
<span><span data-zh>第 </span><span data-en>Round </span><span id="round-num">1</span> / 3 <span data-zh>轮</span></span>
<span><span id="interactions">0</span> / 18 <span data-zh>互动</span><span data-en>interactions</span></span>
</div>
<div id="feed-grid" class="grid grid-cols-2 sm:grid-cols-3 gap-3"></div>
<div id="feed-done" class="hidden mt-4 text-center">
<button class="btn-primary" onclick="goTo(4)">
<span data-zh>查看 AI 给你的画像 →</span><span data-en>See your AI profile →</span>
</button>
</div>
</div>
<!-- AI Brain side panel -->
<div class="md:sticky md:top-4 self-start">
<div class="ai-brain" id="brain">
<div class="text-3xl mb-2">🤖</div>
<div class="text-xs uppercase text-slate-500 font-bold mb-1"><span data-zh>AI 大脑</span><span data-en>AI Brain</span></div>
<div class="text-sm" id="brain-msg"><span data-zh>等你开始刷……</span><span data-en>Waiting for you to scroll…</span></div>
</div>
<div class="mt-3 bg-white border border-slate-200 rounded-xl p-3">
<div class="text-xs uppercase text-slate-500 font-bold mb-2"><span data-zh>正在学的标签</span><span data-en>Tags being learned</span></div>
<div id="tag-live" class="space-y-1"></div>
</div>
</div>
</div>
</section>
<!-- ========== PHASE 4: YOUR ALGORITHM PROFILE ========== -->
<section class="phase" id="p4">
<div class="lingxi-bubble mb-5">
<div class="font-bold mb-1 text-blue-700"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
<p data-zh>看!这是<strong>"AI 给你贴的标签"</strong>——基于你刚才<strong>18 次互动</strong>算出来的。下次你打开 APP,它会<strong>优先</strong>推送匹配这些标签的视频。</p>
<p data-en>Look! These are <strong>"the tags AI gave you"</strong> — computed from your 18 interactions. Next time you open the app, it'll <strong>prioritize</strong> videos matching these tags.</p>
</div>
<div class="bg-white border-2 border-amber-300 rounded-2xl p-5">
<div class="text-xs uppercase text-amber-700 font-bold tracking-wide mb-3 flex items-center justify-between">
<span>🏷️ <span data-zh>你的算法画像</span><span data-en>Your Algorithm Profile</span></span>
<span class="text-slate-500 normal-case"><span data-zh>基于 18 次互动</span><span data-en>based on 18 interactions</span></span>
</div>
<div id="profile-final"></div>
<div class="mt-4 p-3 bg-red-50 border border-red-200 rounded-lg text-sm">
<strong>📌 <span data-zh>这意味着什么</span><span data-en>What this means</span></strong>:
<span data-zh>抖音/快手/B站 都有<strong>同样的画像</strong>——只是<strong>更精确(基于你 100,000 次互动)</strong>。你的算法画像决定了你看到的世界。<strong>但你从来没看过自己的画像</strong>——平台不会主动给你看。</span>
<span data-en>TikTok/Bilibili/RedNote have <strong>this same profile</strong> — just <strong>much sharper (built on 100,000 interactions)</strong>. Your profile shapes your world. <strong>You\'ve never seen yours</strong> — platforms don't volunteer it.</span>
</div>
</div>
<div class="mt-5 flex justify-end">
<button class="btn-primary" onclick="goTo(5)">
<span data-zh>下一关:反思 →</span><span data-en>Next: reflect →</span>
</button>
</div>
</section>
<!-- ========== PHASE 5: REFLECTION ========== -->
<section class="phase" id="p5">
<div class="lingxi-bubble mb-5">
<div class="font-bold mb-1 text-blue-700"><span data-zh>小京灵</span><span data-en>Jingling</span></div>
<p data-zh>推荐算法是 2026 年最强大的 AI 应用——也是<strong>影响你每天生活最大的 AI</strong>。请你写下:</p>
<p data-en>Recsys is 2026's most powerful AI app — and <strong>the AI most affecting your daily life</strong>. Reflect:</p>
</div>
<div class="space-y-2 mb-4">
<label class="block bg-white rounded-xl p-4 border border-slate-200 cursor-pointer hover:border-blue-400 transition" onclick="selReflect(0)">
<input type="radio" name="reflect" class="mr-2"/>
<span data-zh>① "算法替我选" vs "我自己选"——哪种更累?哪种你更想要?为什么?</span>
<span data-en>① "Algo chooses for me" vs "I choose" — which feels easier? Which do you prefer? Why?</span>
</label>
<label class="block bg-white rounded-xl p-4 border border-slate-200 cursor-pointer hover:border-blue-400 transition" onclick="selReflect(1)">
<input type="radio" name="reflect" class="mr-2"/>
<span data-zh>② 你的算法画像里,有没有你<strong>没意识到</strong>的标签?你愿意让别人看到你的画像吗?</span>
<span data-en>② Any tag in your profile you <strong>didn't realize</strong> applies? Would you show your profile to others?</span>
</label>
<label class="block bg-white rounded-xl p-4 border border-slate-200 cursor-pointer hover:border-blue-400 transition" onclick="selReflect(2)">
<input type="radio" name="reflect" class="mr-2"/>
<span data-zh>③ 如果让你设计一个"让用户少沉迷"的推荐算法,你会怎么改?平台为什么不做?</span>
<span data-en>③ Design a recsys that "reduces addiction" — what changes? Why don't platforms do this?</span>
</label>
</div>
<textarea id="reflect-text" rows="5" class="w-full p-4 border-2 border-slate-200 rounded-xl focus:outline-none focus:border-blue-500 transition"
placeholder="写下你的想法 / Write here..." oninput="updateReflectCount()"></textarea>
<div class="flex items-center justify-between mt-2">
<div class="text-sm text-slate-500"><span id="reflect-count" aria-live="polite" aria-atomic="true">0</span> <span data-zh>字</span><span data-en>chars</span></div>
<button class="btn-primary" id="reflect-submit" disabled onclick="submitReflect()">
<span data-zh>提交并完成 M5-1 →</span><span data-en>Submit & finish →</span>
</button>
</div>
</section>
<!-- ========== PHASE 6: COMPLETION ========== -->
<section class="phase" id="p6">
<div class="text-center py-6">
<div class="inline-block badge-glow rounded-full p-4 bg-gradient-to-br from-slate-500 to-slate-700 mb-5">
<svg viewBox="0 0 100 100" width="100" height="100" xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="46" fill="#94A3B8" stroke="#fff" stroke-width="3"/>
<circle cx="50" cy="50" r="36" fill="none" stroke="#fff" stroke-width="2" stroke-dasharray="4,4"/>
<text x="50" y="62" font-size="38" text-anchor="middle">👀</text>
</svg>
</div>
<h2 class="text-3xl sm:text-4xl font-black"><span data-zh>第 1 关完成</span><span data-en>Mission #1 done</span></h2>
<p class="text-xl text-slate-600 mt-2"><span data-zh>"算法识破者" 徽章已解锁</span><span data-en>"Algorithm Decoder" badge unlocked</span></p>
<div class="mt-6 max-w-2xl mx-auto p-5 bg-slate-50 border border-slate-200 rounded-2xl text-left">
<div class="font-bold mb-2"><span data-zh>你今天学到了……</span><span data-en>You learned…</span></div>
<ul class="space-y-1 text-sm text-slate-700">
<li>✓ <span data-zh>推荐算法 = <strong>4 步循环</strong>:观察 → 提取 → 预测 → 推送</span><span data-en>Recsys = <strong>4-step loop</strong>: observe → extract → predict → push</span></li>
<li>✓ <span data-zh>每次点赞/跳过,<strong>你的算法画像在更新</strong></span><span data-en>Every like/skip <strong>updates your algo profile</strong></span></li>
<li>✓ <span data-zh>"算法懂你"<strong>越多 = 你看到的世界越窄</strong></span><span data-en>The more algo "knows" you, <strong>the narrower your world</strong></span></li>
<li>✓ <span data-zh>你从未看过自己的算法画像——下一关让你看到<strong>它对两个人有多不同</strong></span><span data-en>You\'ve never seen yours — next mission shows you <strong>how different it is for 2 people</strong></span></li>
</ul>
</div>
<div class="mt-7 flex flex-wrap justify-center gap-3">
<button class="btn-ghost" onclick="restart()" aria-label="重玩 / Replay">🔄 <span data-zh>重玩</span><span data-en>Replay</span></button>
<button class="btn-primary" onclick="location.href='m5-2-echo.html'">
<span data-zh>下一关:M5-2 信息茧房 →</span><span data-en>Next: M5-2 Echo Chamber →</span>
</button>
</div>
<div class="mt-3">
<a href="index.html" class="text-sm text-slate-500 underline"><span data-zh>← 返回课程首页</span><span data-en>← Back home</span></a>
</div>
</div>
</section>
</div>
<footer class="max-w-5xl mx-auto px-6 py-8 text-xs text-slate-400">
<span data-zh>从0开始学AI · M5-1 · 开发者:辜月晗 · 2026</span><span data-en>AI Literacy Courses for Beginners · M5-1 · Dev: Gu Yuehan · 2026</span>
</footer>
<script>
const LANG_KEY='lingxi-lang';
let LANG = localStorage.getItem(LANG_KEY) || 'zh';
if(LANG==='en') document.body.classList.add('lang-en');
function toggleLang(){
document.body.classList.toggle('lang-en');
LANG = document.body.classList.contains('lang-en')?'en':'zh';
localStorage.setItem(LANG_KEY, LANG);
}
/* =====================================================
ALGORITHM 4-STEP LOOP
===================================================== */
const ALGO = [
{id:'observe', emoji:'👁️',
name:{zh:'① 观察', en:'① Observe'},
what:{zh:'你点了赞、看了几秒、有没有评论、收藏、转发……每个动作都被记录。',
en:'Your likes, watch time, comments, saves, shares — all logged.'}},
{id:'extract', emoji:'🏷️',
name:{zh:'② 提取特征', en:'② Extract features'},
what:{zh:'AI 把你的行为转成"标签":爱看美食、不爱看运动、对游戏内容停留长……',
en:'AI converts behavior to "tags": likes food, skips sports, lingers on gaming…'}},
{id:'predict', emoji:'🎯',
name:{zh:'③ 预测', en:'③ Predict'},
what:{zh:'根据你的标签,AI 算下一个视频"<strong>你会喜欢的概率</strong>"。概率越高越优先。',
en:'Based on tags, AI computes <strong>"likelihood you\'ll like"</strong> for next video. Highest wins.'}},
{id:'push', emoji:'📲',
name:{zh:'④ 推送', en:'④ Push'},
what:{zh:'优先推高概率的——你看了 → 回到步骤 ①,<strong>循环更紧</strong>。这就是"上瘾"的机制。',
en:'Push high-prob first — you watch → loop to ① <strong>tighter and tighter</strong>. That\'s the addiction mechanism.'}},
];
/* =====================================================
VIDEO CATEGORIES + STARTER FEED
===================================================== */
const CATEGORIES = [
{id:'game', emoji:'🎮', name:{zh:'游戏', en:'Gaming'}, c1:'#a855f7', c2:'#7c3aed'},
{id:'food', emoji:'🍜', name:{zh:'美食', en:'Food'}, c1:'#f97316', c2:'#ea580c'},
{id:'pets', emoji:'🐱', name:{zh:'萌宠', en:'Pets'}, c1:'#fbbf24', c2:'#f59e0b'},
{id:'study', emoji:'📚', name:{zh:'学习', en:'Study'}, c1:'#3b82f6', c2:'#1d4ed8'},
{id:'sports', emoji:'⚽', name:{zh:'运动', en:'Sports'}, c1:'#10b981', c2:'#059669'},
{id:'funny', emoji:'😆', name:{zh:'搞笑', en:'Funny'}, c1:'#ef4444', c2:'#dc2626'},
{id:'beauty', emoji:'💄', name:{zh:'美妆', en:'Beauty'}, c1:'#ec4899', c2:'#db2777'},
{id:'tech', emoji:'💻', name:{zh:'科技', en:'Tech'}, c1:'#06b6d4', c2:'#0891b2'},
];
const VIDEO_TITLES = {
game:[{zh:'我的世界·末影龙',en:'Minecraft Ender Dragon'},{zh:'王者最强连招',en:'Best combo in MOBA'},{zh:'吃鸡神操作',en:'BR insane play'},{zh:'原神 5.0 攻略',en:'Genshin 5.0 guide'},{zh:'吉尼斯电竞纪录',en:'Esports world record'}],
food:[{zh:'1 分钟做西红柿炒蛋',en:'Tomato eggs in 1 min'},{zh:'四川火锅秘籍',en:'Sichuan hotpot secrets'},{zh:'治愈系深夜食堂',en:'Late-night snack ASMR'},{zh:'你没吃过的小众水果',en:'Rare fruit you haven\'t tried'},{zh:'妈妈的拿手菜',en:'Mom\'s signature dish'}],
pets:[{zh:'橘猫趴键盘上',en:'Orange cat on keyboard'},{zh:'柴犬笑死了',en:'Shiba Inu laugh'},{zh:'救助流浪猫',en:'Rescuing strays'},{zh:'仓鼠塞食物',en:'Hamster stuffing food'},{zh:'我家狗有特异功能',en:'My dog\'s superpower'}],
study:[{zh:'30 秒学一道几何',en:'Geometry in 30s'},{zh:'背单词神技',en:'Vocab memory hack'},{zh:'物理学霸答疑',en:'Physics genius Q&A'},{zh:'高效学习法',en:'Efficient study tips'},{zh:'考前 1 天怎么过',en:'Day-before-exam plan'}],
sports:[{zh:'梅西绝杀',en:'Messi\'s winning goal'},{zh:'NBA 十大扣篮',en:'NBA top 10 dunks'},{zh:'乒乓神球',en:'Insane ping-pong'},{zh:'马拉松冠军采访',en:'Marathon champ interview'},{zh:'极限运动',en:'Extreme sports'}],
funny:[{zh:'笑到喷饭的合集',en:'Laugh-out-loud comp'},{zh:'整蛊室友',en:'Pranking roomie'},{zh:'方言段子',en:'Dialect jokes'},{zh:'熊孩子日常',en:'Naughty kid daily'},{zh:'宠物谐音梗',en:'Pet puns'}],
beauty:[{zh:'平价化妆品测评',en:'Affordable cosmetics review'},{zh:'校园简易妆容',en:'Easy school makeup'},{zh:'敏感肌护肤',en:'Sensitive-skin care'},{zh:'染发翻车',en:'Hair-dye fail'},{zh:'素颜挑战',en:'No-makeup challenge'}],
tech:[{zh:'最新 AI 工具',en:'Newest AI tools'},{zh:'iPhone 隐藏功能',en:'iPhone hidden features'},{zh:'数码新品上手',en:'Gadget unboxing'},{zh:'编程零基础',en:'Coding from scratch'},{zh:'比尔盖茨访谈',en:'Bill Gates interview'}],
};
/* =====================================================
STATE
===================================================== */
const state = {
phase:0,
algoRead:new Set(),
tagScores:{}, // categoryId -> score
interactions:0,
curRound:1,
curBatch:[],
reflectChoice:null,
reflectText:''
};
// Initialize tag scores
CATEGORIES.forEach(c=>state.tagScores[c.id]=0);
/* =====================================================
PHASE 2: ALGO STEPS
===================================================== */
function renderAlgo(){
const host = document.getElementById('algo-grid');
host.innerHTML = ALGO.map(a=>`
<div class="algo-step ${state.algoRead.has(a.id)?'read':''}" data-id="${a.id}" onclick="readAlgo('${a.id}')">
<div class="text-4xl mb-2">${a.emoji}</div>
<div class="font-bold text-sm mb-1"><span data-zh>${a.name.zh}</span><span data-en>${a.name.en}</span></div>
<p class="text-xs text-slate-600"><span data-zh>${a.what.zh}</span><span data-en>${a.what.en}</span></p>
</div>
`).join('');
}
function readAlgo(id){
state.algoRead.add(id);
renderAlgo();
document.getElementById('algo-count').textContent = state.algoRead.size;
if(state.algoRead.size>=4) document.getElementById('p2-next').disabled = false;
}
/* =====================================================
PHASE 3: SIMULATED FEED
===================================================== */
function generateBatch(){
// For round 1: uniform random (no learning yet)
// For round 2-3: weighted by tagScores
const batch = [];
for(let i=0;i<6;i++){
let cat;
if(state.curRound===1 || state.interactions<3){
// Uniform
cat = CATEGORIES[Math.floor(Math.random()*CATEGORIES.length)];
} else {
// Weighted by current tag scores (with smoothing)
const total = CATEGORIES.reduce((sum,c)=>sum + Math.max(1, state.tagScores[c.id]+1), 0);
let r = Math.random() * total;
for(const c of CATEGORIES){
const w = Math.max(1, state.tagScores[c.id]+1);
if(r < w){ cat=c; break; }
r -= w;
}
if(!cat) cat = CATEGORIES[0];
}
const titles = VIDEO_TITLES[cat.id];
const title = titles[Math.floor(Math.random()*titles.length)];
batch.push({cat, title, id:'v'+Math.random().toString(36).slice(2,8), action:null});
}
return batch;
}
function renderFeed(){
const host = document.getElementById('feed-grid');
host.innerHTML = state.curBatch.map(v=>`
<div class="video-card ${v.action==='like'?'liked':v.action==='skip'?'skipped':''}" data-id="${v.id}">
<div class="video-thumb" style="--c1:${v.cat.c1};--c2:${v.cat.c2}">${v.cat.emoji}</div>
<div class="p-2">
<div class="text-xs font-bold"><span data-zh>${v.title.zh}</span><span data-en>${v.title.en}</span></div>
<div class="text-xs text-slate-500 mb-2"><span data-zh>#${v.cat.name.zh}</span><span data-en>#${v.cat.name.en}</span></div>
${v.action===null ? `
<div class="flex gap-1">
<button class="btn-ghost text-xs flex-1 border-red-300" onclick="videoAction('${v.id}','like')">❤️</button>
<button class="btn-ghost text-xs flex-1" onclick="videoAction('${v.id}','skip')">⏭</button>
</div>
` : v.action==='like' ? '<div class="text-xs text-red-700 font-bold text-center">❤️ <span data-zh>已点赞</span><span data-en>Liked</span></div>'
: '<div class="text-xs text-slate-500 text-center">⏭ <span data-zh>跳过</span><span data-en>Skipped</span></div>'
}
</div>
</div>
`).join('');
}
function videoAction(id, action){
const v = state.curBatch.find(x=>x.id===id);
if(!v || v.action) return;
v.action = action;
// Update scores
if(action==='like') state.tagScores[v.cat.id] += 2;
else state.tagScores[v.cat.id] -= 1;
state.interactions++;
renderFeed();
updateBrain(v, action);
updateLiveTags();
document.getElementById('interactions').textContent = state.interactions;
// Check if batch complete
if(state.curBatch.every(x=>x.action!==null)){
if(state.curRound<3){
setTimeout(()=>{
state.curRound++;
state.curBatch = generateBatch();
document.getElementById('round-num').textContent = state.curRound;
renderFeed();
updateBrain(null, 'round');
}, 800);
} else {
// Done
document.getElementById('feed-done').classList.remove('hidden');
}
}
}
function updateBrain(v, action){
const brain = document.getElementById('brain');
const msg = document.getElementById('brain-msg');
brain.classList.add('thinking');
if(action==='round'){
msg.innerHTML = `<span class="pulse-text"><span data-zh>正在根据你的偏好调整推荐……</span><span data-en>Re-tuning based on your taste…</span></span>`;
} else if(action==='like'){
msg.innerHTML = `<span data-zh>"哦!${LANG==='zh'?v.cat.name.zh:v.cat.name.en}+1"<br>→ 下次给你<strong>更多 ${v.cat.emoji}</strong></span><span data-en>"Oh! ${v.cat.name.en}+1"<br>→ next batch <strong>more ${v.cat.emoji}</strong></span>`;
} else {
msg.innerHTML = `<span data-zh>"${LANG==='zh'?v.cat.name.zh:v.cat.name.en}-1"<br>→ 下次<strong>少给 ${v.cat.emoji}</strong></span><span data-en>"${v.cat.name.en}-1"<br>→ next batch <strong>less ${v.cat.emoji}</strong></span>`;
}
setTimeout(()=>brain.classList.remove('thinking'), 600);
}
function updateLiveTags(){
const host = document.getElementById('tag-live');
const sorted = [...CATEGORIES].sort((a,b)=>state.tagScores[b.id]-state.tagScores[a.id]).slice(0,5);
const maxScore = Math.max(1, ...sorted.map(c=>Math.abs(state.tagScores[c.id])));
host.innerHTML = sorted.map(c=>{
const s = state.tagScores[c.id];
const pct = (Math.abs(s)/maxScore) * 100;
return `<div class="flex items-center gap-2 text-xs">
<span class="text-lg">${c.emoji}</span>
<span class="flex-1"><span data-zh>${c.name.zh}</span><span data-en>${c.name.en}</span></span>
<span class="${s>0?'text-green-700':s<0?'text-red-700':'text-slate-500'} font-bold">${s>0?'+':''}${s}</span>
</div>`;
}).join('');
}
/* =====================================================
PHASE 4: FINAL PROFILE
===================================================== */
function renderFinalProfile(){
const sorted = [...CATEGORIES].sort((a,b)=>state.tagScores[b.id]-state.tagScores[a.id]);
const maxScore = Math.max(1, ...sorted.map(c=>state.tagScores[c.id]));
const host = document.getElementById('profile-final');
host.innerHTML = sorted.map(c=>{
const s = state.tagScores[c.id];
const pct = s>0 ? (s/maxScore)*100 : 0;
const label = s>5 ? {zh:'强偏好', en:'strong fan'} : s>0 ? {zh:'有兴趣', en:'interested'} : s===0 ? {zh:'中立', en:'neutral'} : {zh:'不喜欢', en:'avoid'};
return `<div class="tag-row">
<span class="tag-emoji">${c.emoji}</span>
<span class="tag-name"><span data-zh>${c.name.zh}</span><span data-en>${c.name.en}</span></span>
<div class="tag-bar-wrap"><div class="tag-bar-fill" style="width:${Math.max(2,pct)}%;background:${s>0?'linear-gradient(90deg,#10B981,#3B82F6)':'linear-gradient(90deg,#94A3B8,#64748B)'}"></div></div>
<span class="text-xs ${s>0?'text-blue-700':'text-slate-500'} min-w-[70px] text-right"><span data-zh>${label.zh}</span><span data-en>${label.en}</span></span>
</div>`;
}).join('');
}
/* =====================================================
REFLECTION
===================================================== */
function selReflect(i){
state.reflectChoice=i;
document.querySelectorAll('input[name=reflect]')[i].checked=true;
updateReflectCount();
}
function updateReflectCount(){
const t = document.getElementById('reflect-text').value;
state.reflectText = t;
const len = Array.from(t).length;
document.getElementById('reflect-count').textContent = len;
document.getElementById('reflect-submit').disabled = !(len>=20 && state.reflectChoice!==null);
}
function submitReflect(){
const data = {timestamp:Date.now(),mission:'M5-1',
algoRead:state.algoRead.size,
interactions:state.interactions,
topTags:[...CATEGORIES].sort((a,b)=>state.tagScores[b.id]-state.tagScores[a.id]).slice(0,3).map(c=>({tag:c.id,score:state.tagScores[c.id]})),
reflectChoice:state.reflectChoice,reflectText:state.reflectText};
localStorage.setItem('lingxi-m5-1', JSON.stringify(data));
goTo(6);
}
/* =====================================================
NAVIGATION
===================================================== */
function goTo(n){
document.querySelectorAll('.phase').forEach(s=>s.classList.remove('active'));
document.getElementById('p'+n).classList.add('active');
state.phase=n;
const dots=document.querySelectorAll('#steps .step-dot');
dots.forEach((d,i)=>{
d.classList.remove('done','current');
if(i<n) d.classList.add('done');
else if(i===n) d.classList.add('current');
});
const lbl=document.getElementById('step-label');
if(lbl){
const shown=Math.min(n+1,6);
lbl.innerHTML = `<span data-zh>第 ${shown} / 6 关</span><span data-en>Step ${shown} / 6</span>`;
}
window.scrollTo({top:0,behavior:'smooth'});
if(n===2) renderAlgo();
if(n===3 && state.curBatch.length===0){
state.curBatch = generateBatch();
renderFeed();
updateLiveTags();
}
if(n===4) renderFinalProfile();
}
function restart(){
if(confirm(LANG==='en'?'Restart this mission? Your progress will be cleared.':'重新开始本关?进度会清空。')){
state.phase=0;
state.algoRead=new Set();
state.interactions=0;
state.curRound=1;
state.curBatch=[];
state.reflectChoice=null;
state.reflectText='';
CATEGORIES.forEach(c=>state.tagScores[c.id]=0);
document.getElementById('feed-done').classList.add('hidden');
document.getElementById('algo-count').textContent='0';
document.getElementById('p2-next').disabled=true;
document.getElementById('reflect-text').value='';
document.querySelectorAll('input[name=reflect]').forEach(r=>r.checked=false);
goTo(0);
}
}
</script>
<style>
@keyframes xpPop{0%{opacity:0;transform:translate(-50%,0) scale(.5)}30%{opacity:1;transform:translate(-50%,-20px) scale(1.1)}100%{opacity:0;transform:translate(-50%,-100px) scale(1)}}
.xp-popup{position:fixed;top:max(80px,30vh);left:50%;color:#FBBF24;font-size:38px;font-weight:900;text-shadow:0 0 18px #F59E0B,0 2px 8px rgba(0,0,0,.4);pointer-events:none;z-index:9999;animation:xpPop 1.8s cubic-bezier(.16,1,.3,1) forwards;letter-spacing:.05em}
</style>
<script>
(function(){
function showXP(n){
var el=document.createElement('div');
el.className='xp-popup';
el.textContent='+'+n+' XP';
document.body.appendChild(el);
setTimeout(function(){el.remove()},1900);
}
var _set=localStorage.setItem.bind(localStorage);
localStorage.setItem=function(k,v){
var was=localStorage.getItem(k);
_set(k,v);
if(k&&k.indexOf('lingxi-m')===0&&!was&&!sessionStorage.getItem('xp-'+k)){
sessionStorage.setItem('xp-'+k,'1');
showXP(100);
}
};
})();
</script>
<!-- ===== NAV ENHANCEMENT (Round 6: home button + step-dot replay + ESC + save toast) ===== -->
<style>
.nav-home{position:fixed;left:16px;top:16px;z-index:60;display:inline-flex;align-items:center;gap:.4rem;padding:.5rem 1rem;background:#fff;border:1px solid #E2E8F0;border-radius:9999px;font-size:.8rem;font-weight:500;text-decoration:none;color:#0F172A;box-shadow:0 4px 10px rgba(0,0,0,.06);transition:all .2s;font-family:inherit}
.nav-home:hover{transform:translateX(-2px);box-shadow:0 8px 20px rgba(0,0,0,.1);background:#F8FAFC}
.nav-home .nh-icon{font-size:1rem}
.step-dot.done{cursor:pointer;position:relative}
.step-dot.done::before{content:"";position:absolute;inset:-12px;border-radius:50%;z-index:1}
.step-dot.done:hover{transform:scale(1.4);box-shadow:0 0 10px rgba(16,185,129,.6)}
.save-toast{position:fixed;bottom:24px;right:24px;background:#0F172A;color:#fff;padding:.6rem 1rem;border-radius:9999px;font-size:.8rem;box-shadow:0 8px 24px rgba(0,0,0,.3);z-index:9999;display:none;align-items:center;gap:.5rem;font-weight:500}
.save-toast.show{display:inline-flex;animation:toastIn .35s cubic-bezier(.16,1,.3,1)}
@keyframes toastIn{from{opacity:0;transform:translateY(20px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}
.save-toast .st-check{color:#10B981;font-weight:700}
/* Mobile: ensure page header doesn't overlap with nav-home + lang-toggle */
@media (max-width:640px){.max-w-5xl{padding-top:60px !important}}
</style>
<a class="nav-home" href="index.html" title="返回课程地图 (ESC)" aria-label="返回课程地图 / Return to course map">
<span class="nh-icon">🏠</span>
<span data-zh>课程地图</span><span data-en>Course map</span>
</a>
<div class="save-toast" id="saveToast">
<span class="st-check">✓</span>
<span data-zh>这一步完成</span><span data-en>Step done</span>
</div>
<script>
(function(){
// ESC → confirm and return to map
document.addEventListener('keydown', function(e){
if(e.key === 'Escape'){
// 完成态不显示确认弹窗
var lastPhase = document.querySelector('.phase.active');
var isCompletion = lastPhase && (lastPhase.id === 'p' + (document.querySelectorAll('.phase').length - 1) || lastPhase.querySelector('.badge-glow,.badge-glow-final,.cert-sealed'));
if(isCompletion){
location.href = 'index.html';
return;
}
var en = document.body.classList.contains('lang-en');
var msg = en ? 'Leave this mission? Your progress is auto-saved.' : '离开这一关?进度已自动保存。';
if(confirm(msg)) location.href = 'index.html';
}
});
// Clickable step-dots for completed phases — wire after DOM is ready
document.addEventListener('click', function(e){
var t = e.target;
if(!t || !t.classList || !t.classList.contains('step-dot') || !t.classList.contains('done')) return;
var dots = document.querySelectorAll('#steps .step-dot');
var idx = -1;
for(var i=0;i<dots.length;i++){ if(dots[i]===t){ idx=i; break; } }
if(idx >= 0 && typeof window.goTo === 'function') window.goTo(idx);
});
// Wrap window.goTo to fire save-toast on forward progress (not on review jumps)
var maxPhase = 0;
if(typeof window.goTo === 'function'){
var _orig = window.goTo;
window.goTo = function(n){
_orig(n);
if(typeof n === 'number' && n > maxPhase){
maxPhase = n;
var toast = document.getElementById('saveToast');
if(toast){
toast.classList.add('show');
clearTimeout(window._stTimer);
window._stTimer = setTimeout(function(){ toast.classList.remove('show') }, 1800);
}
}
};
}
})();
</script>
<!-- ===== /NAV ENHANCEMENT ===== -->
<!-- ===== REFLECT SUBMIT GATE HINT ===== -->
<style>
.reflect-hint{display:none;font-size:.78rem;margin-top:.6rem;padding:.5rem .9rem;background:#FEF3C7;border:1px solid #FCD34D;border-radius:.6rem;text-align:right;font-weight:500;line-height:1.4}
.reflect-hint.show{display:block}
.reflect-hint.all-ok{background:#D1FAE5;border-color:#10B981;color:#065F46}
.reflect-hint .r-ok{color:#059669;font-weight:700}
.reflect-hint .r-miss{color:#B91C1C;font-weight:600}
.reflect-hint .r-sep{color:#94A3B8;margin:0 .5rem}
</style>
<script>
(function(){
function setup(){
var btn = document.getElementById('reflect-submit');
var ta = document.getElementById('reflect-text');
if(!btn || !ta) return;
// Create hint element and insert after the button's parent row
var hint = document.createElement('div');
hint.className = 'reflect-hint show';
hint.id = 'reflect-hint';
var row = btn.parentElement;
if(row && row.parentElement){
row.parentElement.insertBefore(hint, row.nextSibling);
} else {
btn.parentElement.appendChild(hint);
}
function update(){
var en = document.body.classList.contains('lang-en');
var radios = document.querySelectorAll('input[name=reflect]');
var radioPicked = false;
for(var i=0;i<radios.length;i++){ if(radios[i].checked){ radioPicked=true; break; } }
var len = Array.from(ta.value).length;
var enough = len >= 20;
var rStatus = radioPicked
? (en ? '<span class="r-ok">✓ Question picked</span>' : '<span class="r-ok">✓ 选了思考题</span>')
: (en ? '<span class="r-miss">○ Pick a question</span>' : '<span class="r-miss">○ 先选一道思考题</span>');
var tStatus;
if(enough){
tStatus = en ? '<span class="r-ok">✓ Enough words</span>' : '<span class="r-ok">✓ 字数达标</span>';
} else {
var diff = 20 - len;
tStatus = en
? '<span class="r-miss">⚠ Need ' + diff + ' more chars</span>'
: '<span class="r-miss">⚠ 还差 ' + diff + ' 字(共 20)</span>';
}
hint.innerHTML = rStatus + '<span class="r-sep">·</span>' + tStatus;
hint.classList.toggle('all-ok', radioPicked && enough);
// Tooltip on disabled button
if(btn.disabled){
btn.title = en
? 'Pick a reflection question above and type at least 20 chars'
: '先在上面选一道思考题 + 写至少 20 个字才能提交';
btn.style.cursor = 'not-allowed';
} else {
btn.removeAttribute('title');
btn.style.cursor = '';
}
}
ta.addEventListener('input', update);
document.querySelectorAll('input[name=reflect]').forEach(function(r){
r.addEventListener('change', update);
});
// Catch programmatic radio selects via label clicks (selReflect)
document.querySelectorAll('label').forEach(function(l){
l.addEventListener('click', function(){ setTimeout(update, 50); });
});
update();
}
if(document.readyState === 'loading'){
document.addEventListener('DOMContentLoaded', setup);
} else {
setup();
}
})();
</script>
<!-- ===== /REFLECT SUBMIT GATE HINT ===== -->
</body>
</html>