code_crafterz/index.html at main · vignesh2027/code_crafterz · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>CodeCrafterz — Build Your Own &lt;Technology&gt;</title>
  <meta name="description" content="200+ curated step-by-step guides for building your favourite technologies completely from scratch. Learn by building."/>
  <meta name="author" content="Vignesh Warrier"/>
  <meta property="og:title" content="CodeCrafterz — Build Your Own Technology"/>
  <meta property="og:description" content="200+ curated guides for building your favourite tech from scratch."/>
  <meta property="og:type" content="website"/>
  <meta property="og:url" content="https://vignesh2027.github.io/code_crafterz"/>
  <link rel="preconnect" href="https://fonts.googleapis.com"/>
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin/>
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap" rel="stylesheet"/>
  <style>
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --cream:      #fdf8f3;
      --warm:       #fff9f5;
      --card:       #fffbf7;
      --p900: #3b0764; --p800: #4c1d95; --p700: #5b21b6;
      --p600: #7c3aed; --p500: #8b5cf6; --p400: #a78bfa;
      --p300: #c4b5fd; --p200: #ddd6fe; --p100: #ede9fe;
      --p50:  #f5f3ff;
      --text:   #1a0533; --tmid: #4b2882;
      --tsoft:  #6d4b9a; --tmut: #9c7cbf;
      --border: #e8d9ff;
      --r: 14px;
    }

    html { scroll-behavior: smooth; }
    body { font-family: 'Inter', sans-serif; background: var(--cream); color: var(--text); line-height: 1.6; overflow-x: hidden; }

    /* ─── PARTICLES CANVAS ─── */
    #particles { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; opacity: .5; }

    /* ─── HERO ─── */
    .hero {
      position: relative; min-height: 100vh;
      display: flex; flex-direction: column; align-items: center; justify-content: center;
      text-align: center; padding: 5rem 1.5rem 4rem; overflow: hidden;
      background: linear-gradient(135deg,#fdf4ff 0%,#f0ebff 40%,#e9e0ff 100%);
      z-index: 1;
    }
    .hero::before {
      content:''; position:absolute; inset:0; pointer-events:none;
      background:
        radial-gradient(ellipse 80% 60% at 15% 20%,rgba(167,139,250,.22) 0%,transparent 55%),
        radial-gradient(ellipse 60% 80% at 85% 75%,rgba(139,92,246,.18) 0%,transparent 55%),
        radial-gradient(ellipse 50% 50% at 50% 0%,rgba(196,181,253,.28) 0%,transparent 50%);
    }

    /* floating orbs */
    .orb { position:absolute; border-radius:50%; filter:blur(65px); pointer-events:none; }
    .orb1 { width:500px;height:500px;background:rgba(124,58,237,.1);top:-120px;left:-150px; animation:floatOrb 9s ease-in-out infinite; }
    .orb2 { width:380px;height:380px;background:rgba(167,139,250,.12);bottom:-80px;right:-100px; animation:floatOrb 12s ease-in-out 4s infinite; }
    .orb3 { width:260px;height:260px;background:rgba(196,181,253,.15);top:35%;left:58%; animation:floatOrb 7s ease-in-out 2s infinite; }
    .orb4 { width:180px;height:180px;background:rgba(139,92,246,.12);top:55%;left:8%; animation:floatOrb 10s ease-in-out 6s infinite; }
    @keyframes floatOrb {
      0%,100%{transform:translateY(0) scale(1);}
      33%{transform:translateY(-24px) scale(1.05);}
      66%{transform:translateY(12px) scale(.97);}
    }

    .hero-badge-row { display:flex; gap:.6rem; flex-wrap:wrap; justify-content:center; margin-bottom:2rem; position:relative; }
    .hbadge {
      padding:.32rem .85rem; border-radius:999px; font-size:.72rem; font-weight:700;
      letter-spacing:.06em; text-transform:uppercase;
      animation: fadeUp .7s ease-out both;
    }
    .hbadge:nth-child(1){animation-delay:.1s;background:var(--p100);color:var(--p700);border:1px solid var(--p200);}
    .hbadge:nth-child(2){animation-delay:.2s;background:#f3e8ff;color:#7e22ce;border:1px solid #e9d5ff;}
    .hbadge:nth-child(3){animation-delay:.3s;background:var(--p100);color:var(--p700);border:1px solid var(--p200);}
    .hbadge:nth-child(4){animation-delay:.4s;background:#f3e8ff;color:#7e22ce;border:1px solid #e9d5ff;}

    @keyframes fadeUp { from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:translateY(0);} }

    .hero h1 {
      position:relative; font-size:clamp(3.2rem,9vw,7rem); font-weight:900;
      line-height:1.02; letter-spacing:-.03em;
      background:linear-gradient(135deg,var(--p900) 0%,var(--p600) 45%,var(--p400) 100%);
      -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
      margin-bottom:1rem; animation:fadeUp .9s ease-out .3s both;
    }
    .hero h1 .mono {
      display:block; font-family:'JetBrains Mono',monospace;
      font-size:.6em; letter-spacing:-.01em;
      background:linear-gradient(90deg,var(--p500),var(--p300));
      -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
    }

    /* typewriter cursor */
    .cursor { display:inline-block; width:3px; height:.7em; background:var(--p500); margin-left:2px; vertical-align:middle; animation:blink 1s step-end infinite; }
    @keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0;} }

    .hero-sub {
      font-size:clamp(1rem,2.4vw,1.3rem); color:var(--tsoft); max-width:620px;
      margin:.5rem auto 2rem; animation:fadeUp .9s ease-out .5s both;
    }
    .hero-quote { font-style:italic; color:var(--tmut); font-size:.95rem; margin-bottom:2.5rem; animation:fadeUp .9s ease-out .6s both; }
    .hero-quote strong { color:var(--tsoft); font-style:normal; font-weight:600; }

    .cta-row { display:flex; gap:1rem; flex-wrap:wrap; justify-content:center; margin-bottom:3rem; animation:fadeUp .9s ease-out .7s both; }
    .btn { display:inline-flex; align-items:center; gap:.5rem; padding:.9rem 2.2rem; border-radius:999px; font-weight:700; font-size:1rem; text-decoration:none; transition:all .22s ease; }
    .btn-primary { background:linear-gradient(135deg,var(--p700),var(--p500)); color:#fff; box-shadow:0 4px 22px rgba(124,58,237,.38); }
    .btn-primary:hover { transform:translateY(-3px); box-shadow:0 8px 30px rgba(124,58,237,.5); }
    .btn-ghost { background:var(--warm); color:var(--p700); border:2px solid var(--p200); }
    .btn-ghost:hover { background:var(--p50); transform:translateY(-3px); box-shadow:0 6px 20px rgba(124,58,237,.15); }

    /* stats counter row */
    .stats-row { display:flex; gap:3rem; flex-wrap:wrap; justify-content:center; animation:fadeUp .9s ease-out .9s both; }
    .stat { text-align:center; }
    .stat-num {
      font-size:2.6rem; font-weight:900; line-height:1;
      background:linear-gradient(135deg,var(--p700),var(--p400));
      -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
    }
    .stat-lbl { font-size:.75rem; color:var(--tmut); text-transform:uppercase; letter-spacing:.1em; margin-top:.2rem; }

    /* scroll arrow */
    .scroll-hint {
      position:absolute; bottom:2rem; left:50%; transform:translateX(-50%);
      display:flex; flex-direction:column; align-items:center; gap:.35rem;
      color:var(--tmut); font-size:.72rem; text-transform:uppercase; letter-spacing:.12em;
      animation:scrollBounce 2.4s ease-in-out infinite;
    }
    .scroll-hint svg { width:22px; opacity:.55; }
    @keyframes scrollBounce { 0%,100%{transform:translateX(-50%) translateY(0);}50%{transform:translateX(-50%) translateY(9px);} }

    /* ─── PROGRESS BAR ─── */
    #progress { position:fixed; top:0; left:0; height:3px; background:linear-gradient(90deg,var(--p700),var(--p400)); z-index:200; width:0%; transition:width .1s linear; }

    /* ─── NAV ─── */
    nav {
      position:sticky; top:0; z-index:100;
      background:rgba(253,248,243,.92); backdrop-filter:blur(14px);
      border-bottom:1px solid var(--border);
    }
    .nav-inner { max-width:1200px; margin:0 auto; display:flex; align-items:center; justify-content:space-between; gap:1rem; padding:.75rem 2rem; }
    .nav-logo { font-family:'JetBrains Mono',monospace; font-weight:800; font-size:1.05rem; text-decoration:none;
      background:linear-gradient(135deg,var(--p700),var(--p400));
      -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
    .nav-links { display:flex; gap:1.2rem; list-style:none; flex-wrap:wrap; }
    .nav-links a { font-size:.82rem; font-weight:500; color:var(--tsoft); text-decoration:none; transition:color .18s; }
    .nav-links a:hover { color:var(--p600); }
    .nav-right { display:flex; gap:.7rem; }
    .nav-btn { padding:.38rem .9rem; border-radius:999px; font-size:.8rem; font-weight:600; text-decoration:none; }
    .nav-btn-outline { border:1.5px solid var(--p200); color:var(--p700); }
    .nav-btn-outline:hover { background:var(--p50); }
    .nav-btn-fill { background:linear-gradient(135deg,var(--p700),var(--p500)); color:#fff; }
    .nav-btn-fill:hover { box-shadow:0 4px 14px rgba(124,58,237,.3); }

    /* ─── FILTER BAR ─── */
    .filter-zone { max-width:1200px; margin:0 auto; padding:2.5rem 2rem 1rem; }
    .search-row { position:relative; margin-bottom:1.5rem; }
    .search-icon { position:absolute; left:1.2rem; top:50%; transform:translateY(-50%); color:var(--tmut); pointer-events:none; }
    .search-input {
      width:100%; padding:.9rem 1.2rem .9rem 3rem;
      border:2px solid var(--p200); border-radius:999px;
      background:var(--warm); font-size:1rem; font-family:'Inter',sans-serif;
      color:var(--text); outline:none; transition:border-color .2s,box-shadow .2s;
    }
    .search-input:focus { border-color:var(--p500); box-shadow:0 0 0 4px rgba(139,92,246,.14); }
    .search-input::placeholder { color:var(--tmut); }

    .lang-filters { display:flex; gap:.5rem; flex-wrap:wrap; }
    .lang-btn {
      padding:.3rem .8rem; border-radius:999px; font-size:.78rem; font-weight:600;
      border:1.5px solid var(--p200); background:var(--warm); color:var(--tsoft);
      cursor:pointer; transition:all .18s; font-family:'Inter',sans-serif;
    }
    .lang-btn:hover, .lang-btn.active { background:var(--p600); color:#fff; border-color:var(--p600); }
    .lang-btn.all-btn.active { background:linear-gradient(135deg,var(--p700),var(--p500)); border:none; color:#fff; }

    /* ─── MAIN ─── */
    main { max-width:1200px; margin:0 auto; padding:1rem 2rem 6rem; }

    /* category section */
    .section { margin-bottom:2.5rem; animation:fadeUp .5s ease-out both; }
    .section-head {
      display:flex; align-items:center; gap:.75rem;
      margin-bottom:1rem; padding-bottom:.7rem;
      border-bottom:2px solid var(--p100);
    }
    .s-emoji { font-size:1.5rem; }
    .s-title { font-size:1.35rem; font-weight:800; color:var(--text); letter-spacing:-.02em; }
    .s-count { margin-left:auto; background:var(--p100); color:var(--p700); padding:.18rem .6rem; border-radius:999px; font-size:.75rem; font-weight:700; }

    /* card grid */
    .cards { display:grid; gap:.65rem; }

    .card {
      display:flex; align-items:center; gap:.9rem; padding:.9rem 1.1rem;
      background:var(--card); border:1px solid var(--border); border-radius:var(--r);
      text-decoration:none; color:inherit; transition:all .2s ease;
      box-shadow:0 1px 4px rgba(124,58,237,.07);
      position:relative; overflow:hidden;
    }
    .card::before {
      content:''; position:absolute; left:0; top:0; bottom:0; width:3px;
      background:linear-gradient(180deg,var(--p600),var(--p400));
      transform:scaleY(0); transform-origin:bottom;
      transition:transform .2s ease; border-radius:2px 0 0 2px;
    }
    .card:hover { border-color:var(--p300); box-shadow:0 4px 18px rgba(124,58,237,.14); transform:translateY(-1px); background:var(--warm); }
    .card:hover::before { transform:scaleY(1); }

    /* language pill */
    .lpill {
      flex-shrink:0; padding:.28rem .65rem; border-radius:6px;
      font-size:.68rem; font-weight:700; font-family:'JetBrains Mono',monospace;
      letter-spacing:.02em; min-width:62px; text-align:center; white-space:nowrap;
    }
    .lc    {background:#ede9fe;color:#5b21b6;} .lcpp  {background:#f5f3ff;color:#7c3aed;}
    .lcs   {background:#ede9fe;color:#6d28d9;} .lgo   {background:#ecfdf5;color:#065f46;}
    .lpy   {background:#fffbeb;color:#92400e;} .ljs   {background:#fefce8;color:#854d0e;}
    .lts   {background:#eff6ff;color:#1d4ed8;} .lrs   {background:#fff7ed;color:#c2410c;}
    .ljava {background:#fdf2f8;color:#9d174d;} .lrb   {background:#fef2f2;color:#b91c1c;}
    .lhs   {background:#f5f3ff;color:#4c1d95;} .lkt   {background:#fdf4ff;color:#7e22ce;}
    .lnj   {background:#f0fdf4;color:#14532d;} .lphp  {background:#f5f3ff;color:#5b21b6;}
    .lsh   {background:#1a0533;color:#c4b5fd;} .lasm  {background:#fef2f2;color:#7f1d1d;}
    .lany  {background:linear-gradient(135deg,var(--p100),#fdf4ff);color:var(--p700);}
    .lother{background:#f9fafb;color:#374151;}

    .card-title { font-size:.9rem; font-weight:500; color:var(--text); flex:1; line-height:1.4; }
    .card-tags { display:flex; gap:.4rem; flex-shrink:0; }
    .ctag {
      font-size:.65rem; padding:.15rem .5rem; border-radius:4px;
      background:var(--p100); color:var(--p600); font-weight:600;
    }
    .ctag-video { background:#fef9c3; color:#854d0e; }
    .ctag-book  { background:#ecfdf5; color:#065f46; }
    .card-arrow { flex-shrink:0; color:var(--p300); transition:transform .2s,color .2s; font-size:1rem; }
    .card:hover .card-arrow { transform:translateX(5px); color:var(--p600); }

    /* difficulty stars */
    .diff { font-size:.7rem; flex-shrink:0; letter-spacing:.5px; }

    /* ─── STATS SECTION ─── */
    .stats-section {
      background:linear-gradient(135deg,var(--p900),var(--p700));
      margin:3rem 0; border-radius:20px; padding:3rem 2rem;
      display:grid; grid-template-columns:repeat(auto-fit,minmax(160px,1fr)); gap:2rem;
      text-align:center;
    }
    .ss { }
    .ss-num { font-size:3rem; font-weight:900; color:#fff; line-height:1; }
    .ss-lbl { font-size:.8rem; color:var(--p300); text-transform:uppercase; letter-spacing:.1em; margin-top:.4rem; }

    /* ─── LEARNING PATHS ─── */
    .paths-section { margin:3rem 0; }
    .paths-title { font-size:1.6rem; font-weight:800; color:var(--text); margin-bottom:1.5rem; letter-spacing:-.02em; }
    .paths-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:1rem; }
    .path-card {
      padding:1.4rem; background:var(--card); border:1px solid var(--border);
      border-radius:var(--r); transition:all .2s ease;
      box-shadow:0 1px 4px rgba(124,58,237,.06);
    }
    .path-card:hover { border-color:var(--p300); box-shadow:0 6px 20px rgba(124,58,237,.14); transform:translateY(-2px); }
    .path-icon { font-size:2rem; margin-bottom:.75rem; }
    .path-name { font-size:1rem; font-weight:800; color:var(--text); margin-bottom:.4rem; }
    .path-desc { font-size:.85rem; color:var(--tsoft); line-height:1.5; margin-bottom:.8rem; }
    .path-meta { display:flex; justify-content:space-between; align-items:center; }
    .path-steps { font-size:.75rem; color:var(--tmut); }
    .path-diff { font-size:.7rem; background:var(--p100); color:var(--p700); padding:.18rem .55rem; border-radius:4px; font-weight:700; }

    /* ─── BACK TO TOP ─── */
    #btt {
      position:fixed; bottom:2rem; right:2rem; width:46px; height:46px;
      border-radius:50%; background:linear-gradient(135deg,var(--p700),var(--p500));
      color:#fff; border:none; cursor:pointer; display:flex; align-items:center; justify-content:center;
      box-shadow:0 4px 18px rgba(124,58,237,.42); opacity:0; pointer-events:none;
      transition:opacity .3s,transform .3s; z-index:99;
    }
    #btt.show { opacity:1; pointer-events:auto; }
    #btt:hover { transform:translateY(-3px) scale(1.05); }

    /* ─── FOOTER ─── */
    footer {
      background:linear-gradient(135deg,var(--p900),var(--p700));
      color:rgba(255,255,255,.85); text-align:center; padding:4rem 2rem;
    }
    .footer-logo { font-family:'JetBrains Mono',monospace; font-size:1.8rem; font-weight:900; color:#fff; margin-bottom:.5rem; }
    .footer-sub  { color:var(--p300); font-size:.95rem; margin-bottom:2rem; }
    .footer-links { display:flex; gap:1.5rem; justify-content:center; flex-wrap:wrap; margin-bottom:2rem; }
    .footer-links a { color:var(--p300); text-decoration:none; font-size:.88rem; font-weight:500; transition:color .18s; }
    .footer-links a:hover { color:#fff; }
    .footer-credit { font-size:.8rem; color:var(--p400); margin-top:1.5rem; }
    .footer-credit strong { color:var(--p200); }

    .wave-footer { width:100%; display:block; }

    /* ─── HIDDEN ─── */
    .card.hidden { display:none; }
    .section.hidden { display:none; }

    /* ─── TOAST ─── */
    .toast { position:fixed; bottom:5rem; left:50%; transform:translateX(-50%) translateY(20px); opacity:0;
      background:var(--p800); color:#fff; padding:.6rem 1.4rem; border-radius:999px;
      font-size:.85rem; font-weight:600; pointer-events:none; transition:all .3s; z-index:200; }
    .toast.show { opacity:1; transform:translateX(-50%) translateY(0); }

    /* ─── RESPONSIVE ─── */
    @media(max-width:640px) {
      .hero { padding:5rem 1.2rem 3rem; }
      main { padding:1rem 1.2rem 4rem; }
      .filter-zone { padding:1.5rem 1.2rem .5rem; }
      .nav-links, .nav-right { display:none; }
      .stats-section { padding:2rem 1rem; }
    }
  </style>
</head>
<body>

<div id="progress"></div>
<canvas id="particles"></canvas>

<!-- ─── HERO ─── -->
<section class="hero">
  <div class="orb orb1"></div>
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    <a href="#tutorials" class="btn btn-primary">
      <svg width="18" height="18" fill="none" stroke="currentColor" stroke-width="2.2" viewBox="0 0 24 24"><path d="M12 5v14M5 12l7 7 7-7"/></svg>
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      <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor"><path d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z"/></svg>
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    <div class="stat"><div class="stat-num" data-target="200">0</div><div class="stat-lbl">Tutorials</div></div>
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<!-- ─── NAV ─── -->
<nav>
  <div class="nav-inner">
    <a href="#" class="nav-logo">CodeCrafterz</a>
    <ul class="nav-links">
      <li><a href="#tutorials">Tutorials</a></li>
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  </div>
</nav>

<!-- ─── FILTER BAR ─── -->
<div class="filter-zone" id="tutorials">
  <div class="search-row">
    <span class="search-icon">
      <svg width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><circle cx="11" cy="11" r="8"/><path d="M21 21l-4.35-4.35"/></svg>
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    <input class="search-input" type="text" id="search" placeholder="Search 200+ tutorials, languages, technologies…" autocomplete="off"/>
  </div>
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    <button class="lang-btn" data-lang="C">C</button>
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    <button class="lang-btn" data-lang="Haskell">Haskell</button>
  </div>
</div>

<!-- ─── MAIN ─── -->
<main id="main">

  <!-- 3D Renderer -->
  <div class="section" id="renderer">
    <div class="section-head"><span class="s-emoji">🖥️</span><h2 class="s-title">3D Renderer</h2><span class="s-count">10</span></div>
    <div class="cards">
      <a href="https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/how-does-it-work" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Introduction to Ray Tracing: a Simple Method for Creating 3D Images</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/ssloy/tinyrenderer/wiki" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">How OpenGL works: software rendering in 500 lines of code</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://lodev.org/cgtutor/raycasting.html" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Raycasting engine of Wolfenstein 3D</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://www.pbr-book.org/" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Physically Based Rendering: From Theory To Implementation</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://raytracing.github.io/books/RayTracingInOneWeekend.html" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Ray Tracing in One Weekend</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.davrous.com/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill lcs">C# / TS / JS</span><span class="card-title">Learning how to write a 3D soft engine from scratch</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://blog.rogach.org/2015/08/how-to-create-your-own-simple-3d-render.html" target="_blank" class="card" data-lang="Java"><span class="lpill ljava">Java</span><span class="card-title">How to create your own simple 3D render engine in pure Java</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://www.gabrielgambetta.com/computer-graphics-from-scratch/introduction.html" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Computer Graphics from scratch</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://aosabook.org/en/500L/a-3d-modeller.html" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">A 3D Modeller</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- AI Model -->
  <div class="section" id="ai">
    <div class="section-head"><span class="s-emoji">🤖</span><h2 class="s-title">AI Model</h2><span class="s-count">8</span></div>
    <div class="cards">
      <a href="https://github.com/rasbt/LLMs-from-scratch" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">A Large Language Model (LLM) from Scratch</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/watch?v=l8pRSuU81PU" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Build GPT: Reproduce GPT-2 from Scratch</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://peterbloem.nl/blog/transformers" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Building a Transformer from Scratch</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://huggingface.co/learn/diffusion-course/en/unit1/3" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Diffusion Models for Image Generation</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/langchain-ai/rag-from-scratch" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">RAG for Document Search from Scratch</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/watch?v=zduSFxRajkE" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Let's build the GPT Tokenizer</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://towardsdatascience.com/word2vec-from-scratch-with-numpy-8786ddd49b37" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Word2Vec from Scratch with NumPy</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/playlist?list=PLAqhIrjkxbuWI23v9cThsA9GvCAUhRvKZ" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Neural Networks: Zero to Hero (Karpathy)</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Blockchain -->
  <div class="section" id="blockchain">
    <div class="section-head"><span class="s-emoji">⛓️</span><h2 class="s-title">Blockchain / Cryptocurrency</h2><span class="s-count">10</span></div>
    <div class="cards">
      <a href="https://medium.com/crypto-currently/lets-build-the-tiniest-blockchain-e70965a248b" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Let's Build the Tiniest Blockchain</span><span class="diff">⭐</span><span class="card-arrow">→</span></a>
      <a href="https://hackernoon.com/learn-blockchains-by-building-one-117428612f46" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Learn Blockchains by Building One</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/nambrot/blockchain-in-js" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Build your own Blockchain in JavaScript</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://jeiwan.net/posts/building-blockchain-in-go-part-1/" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Building Blockchain in Go</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://lhartikk.github.io/" target="_blank" class="card" data-lang="TypeScript"><span class="lpill lts">TypeScript</span><span class="card-title">Naivecoin: a tutorial for building a cryptocurrency</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://naivecoinstake.learn.uno/" target="_blank" class="card" data-lang="TypeScript"><span class="lpill lts">TypeScript</span><span class="card-title">NaivecoinStake: cryptocurrency with Proof of Stake</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://hackernoon.com/building-a-blockchain-in-rust-and-substrate-a-step-by-step-guide-for-developers-kc223ybp" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Building A Blockchain in Rust &amp; Substrate</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://medium.com/programmers-blockchain/create-simple-blockchain-java-tutorial-from-scratch-6eeed3cb03fa" target="_blank" class="card" data-lang="Java"><span class="lpill ljava">Java</span><span class="card-title">Creating Your First Blockchain with Java</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://medium.com/@vasilyf/lets-implement-a-cryptocurrency-in-kotlin-part-1-blockchain-8704069f8580" target="_blank" class="card" data-lang="Kotlin"><span class="lpill lkt">Kotlin</span><span class="card-title">Let's implement a cryptocurrency in Kotlin</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Database -->
  <div class="section" id="database">
    <div class="section-head"><span class="s-emoji">🗄️</span><h2 class="s-title">Database</h2><span class="s-count">10</span></div>
    <div class="cards">
      <a href="https://cstack.github.io/db_tutorial/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Let's Build a Simple Database</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://build-your-own.org/redis" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Build Your Own Redis from Scratch</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://build-your-own.org/database/" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Build Your Own Database: From B+Tree To SQL in 3000 Lines</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.build-redis-from-scratch.dev/" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Build Your Own Redis from Scratch — Go Edition</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://aosabook.org/en/500L/dagoba-an-in-memory-graph-database.html" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Dagoba: an in-memory graph database</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://aosabook.org/en/500L/dbdb-dog-bed-database.html" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">DBDB: Dog Bed Database</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://charlesleifer.com/blog/building-a-simple-redis-server-with-python/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Write your own miniature Redis with Python</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://dineshgowda.com/posts/build-your-own-persistent-kv-store/" target="_blank" class="card" data-lang="Ruby"><span class="lpill lrb">Ruby</span><span class="card-title">Build your own fast, persistent KV store in Ruby</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://tokio.rs/tokio/tutorial/setup" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Build your own Redis client and server</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Docker -->
  <div class="section" id="docker">
    <div class="section-head"><span class="s-emoji">🐳</span><h2 class="s-title">Docker / Container</h2><span class="s-count">6</span></div>
    <div class="cards">
      <a href="https://blog.lizzie.io/linux-containers-in-500-loc.html" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Linux containers in 500 lines of code</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.infoq.com/articles/build-a-container-golang" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Build Your Own Container Using Less than 100 Lines of Go</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/watch?v=8fi7uSYlOdc" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Building a container from scratch in Go</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/Fewbytes/rubber-docker" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">A workshop on Linux containers: Rebuild Docker from Scratch</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/tonybaloney/mocker" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">A proof-of-concept imitation of Docker, written in 100% Python</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/p8952/bocker" target="_blank" class="card" data-lang="Shell"><span class="lpill lsh">Shell</span><span class="card-title">Docker implemented in around 100 lines of bash</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Emulator -->
  <div class="section" id="emulator">
    <div class="section-head"><span class="s-emoji">💻</span><h2 class="s-title">Emulator / Virtual Machine</h2><span class="s-count">9</span></div>
    <div class="cards">
      <a href="https://justinmeiners.github.io/lc3-vm/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Write your Own Virtual Machine (LC-3)</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://cturt.github.io/cinoop.html" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Writing a Game Boy emulator, Cinoop</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://www.multigesture.net/articles/how-to-write-an-emulator-chip-8-interpreter/" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">How to write an emulator (CHIP-8 interpreter)</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/playlist?list=PLrOv9FMX8xJHqMvSGB_9G9nZZ_4IgteYf" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">NES Emulator From Scratch</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://stevelosh.com/blog/2016/12/chip8-cpu/" target="_blank" class="card" data-lang="Haskell"><span class="lpill lhs">Haskell</span><span class="card-title">CHIP-8 in Common Lisp</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://imrannazar.com/GameBoy-Emulation-in-JavaScript" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">GameBoy Emulation in JavaScript</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://omokute.blogspot.com.br/2012/06/emulation-basics-write-your-own-chip-8.html" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Emulation Basics: Write your own Chip 8 Emulator/Interpreter</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://jeremybanks.github.io/0dmg/" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">0dmg: Learning Rust by building a partial Game Boy emulator</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Frontend Framework -->
  <div class="section" id="frontend">
    <div class="section-head"><span class="s-emoji">⚛️</span><h2 class="s-title">Front-end Framework / Library</h2><span class="s-count">9</span></div>
    <div class="cards">
      <a href="https://pomb.us/build-your-own-react/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Build your own React</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://jasonformat.com/wtf-is-jsx/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">WTF is JSX (Let's Build a JSX Renderer)</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/hexacta/didact" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">A DIY guide to build your own React (Didact)</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://zapier.com/engineering/how-to-build-redux/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Build Yourself a Redux</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://medium.com/@deathmood/how-to-write-your-own-virtual-dom-ee74acc13060" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">How to write your own Virtual DOM</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://blog.mgechev.com/2015/03/09/build-learn-your-own-light-lightweight-angularjs/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Build Your own Simplified AngularJS in 200 Lines</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://medium.com/@sweetpalma/gooact-react-in-160-lines-of-javascript-44e0742ad60f" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Gooact: React in 160 lines of JavaScript</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://mfrachet.github.io/create-frontend-framework/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Building a frontend framework from scratch with components</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://youtu.be/CGpMlWVcHok" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Building a Custom React Renderer</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Game -->
  <div class="section" id="game">
    <div class="section-head"><span class="s-emoji">🎮</span><h2 class="s-title">Game</h2><span class="s-count">18</span></div>
    <div class="cards">
      <a href="https://handmadehero.org/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Handmade Hero — Complete game from scratch</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://nesdoug.com/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">How to Program an NES game in C</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/playlist?list=PLZ1QII7yudbc-Ky058TEaOstZHVbT-2hg" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Chess Engine In C</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://brennan.io/2015/06/12/tetris-reimplementation/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">On Tetris and Reimplementation</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://learnopengl.com/In-Practice/2D-Game/Breakout" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Breakout — LearnOpenGL</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://lazyfoo.net/tutorials/SDL/" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Beginning Game Programming v2.0</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://nicktasios.nl/posts/space-invaders-from-scratch-part-1.html" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Space Invaders from Scratch</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://scottlilly.com/learn-c-by-building-a-simple-rpg-index/" target="_blank" class="card" data-lang="C#"><span class="lpill lcs">C#</span><span class="card-title">Learn C# by Building a Simple RPG</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/watch?v=025QFeZfeyM" target="_blank" class="card" data-lang="Java"><span class="lpill ljava">Java</span><span class="card-title">Code a 2D Game Engine using Java — Full Course</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://www.lessmilk.com/tutorial/flappy-bird-phaser-1" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">How to Make Flappy Bird in HTML5 With Phaser</span><span class="diff">⭐</span><span class="card-arrow">→</span></a>
      <a href="https://medium.freecodecamp.org/think-like-a-programmer-how-to-build-snake-using-only-javascript-html-and-css-7b1479c3339e" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Think like a programmer: Build Snake with JS, HTML &amp; CSS</span><span class="diff">⭐</span><span class="card-arrow">→</span></a>
      <a href="https://auth0.com/blog/developing-games-with-react-redux-and-svg-part-1/" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Developing Games with React, Redux, and SVG</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/SSYGEN/blog/issues/30" target="_blank" class="card" data-lang="Lua"><span class="lpill lother">Lua</span><span class="card-title">BYTEPATH — Complete game in Lua (LÖVE)</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://pythonprogramming.net/pygame-python-3-part-1-intro/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Developing Games With PyGame</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://rogueliketutorials.com/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Roguelike Tutorial Revised</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://a5huynh.github.io/posts/2018/adventures-in-rust/" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Adventures in Rust: A Basic 2D Game</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://tomassedovic.github.io/roguelike-tutorial/" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Roguelike Tutorial in Rust + tcod</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Git -->
  <div class="section" id="git">
    <div class="section-head"><span class="s-emoji">📦</span><h2 class="s-title">Git</h2><span class="s-count">7</span></div>
    <div class="cards">
      <a href="http://stefan.saasen.me/articles/git-clone-in-haskell-from-the-bottom-up/" target="_blank" class="card" data-lang="Haskell"><span class="lpill lhs">Haskell</span><span class="card-title">Reimplementing "git clone" in Haskell from the bottom up</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://gitlet.maryrosecook.com/docs/gitlet.html" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Gitlet</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://benhoyt.com/writings/pygit/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Just enough of a Git client to create a repo, commit, and push itself to GitHub</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://wyag.thb.lt/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Write yourself a Git!</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.leshenko.net/p/ugit/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">ugit: Learn Git Internals by Building Git Yourself</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://robots.thoughtbot.com/rebuilding-git-in-ruby" target="_blank" class="card" data-lang="Ruby"><span class="lpill lrb">Ruby</span><span class="card-title">Rebuilding Git in Ruby</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Neural Network -->
  <div class="section" id="nn">
    <div class="section-head"><span class="s-emoji">🧬</span><h2 class="s-title">Neural Network</h2><span class="s-count">9</span></div>
    <div class="cards">
      <a href="https://iamtrask.github.io/2015/07/12/basic-python-network/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">A Neural Network in 11 lines of Python</span><span class="diff">⭐</span><span class="card-arrow">→</span></a>
      <a href="https://victorzhou.com/blog/intro-to-neural-networks/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Implement a Neural Network from Scratch</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://victorzhou.com/blog/intro-to-cnns-part-1/" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">An Introduction to Convolutional Neural Networks</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://towardsdatascience.com/how-to-generate-music-using-a-lstm-neural-network-in-keras-68786834d4c5" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">Generate Music using LSTM Neural Network in Keras</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/xames3/slowtorch" target="_blank" class="card" data-lang="Python"><span class="lpill lpy">Python</span><span class="card-title">SlowTorch: Implementation of PyTorch from the ground up</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://made2591.github.io/posts/neuralnetwork" target="_blank" class="card" data-lang="Go"><span class="lpill lgo">Go</span><span class="card-title">Build a multilayer perceptron with Golang</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://hackernoon.com/neural-networks-from-scratch-for-javascript-linguists-part1-the-perceptron-632a4d1fbad2" target="_blank" class="card" data-lang="JavaScript"><span class="lpill ljs">JavaScript</span><span class="card-title">Neural networks from scratch for JavaScript linguists — The Perceptron</span><span class="diff">⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.codeproject.com/Articles/11285/Neural-Network-OCR" target="_blank" class="card" data-lang="C#"><span class="lpill lcs">C#</span><span class="card-title">Neural Network OCR</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Operating System -->
  <div class="section" id="os">
    <div class="section-head"><span class="s-emoji">🖥️</span><h2 class="s-title">Operating System</h2><span class="s-count">13</span></div>
    <div class="cards">
      <a href="http://joebergeron.io/posts/post_two.html" target="_blank" class="card" data-lang="Assembly"><span class="lpill lasm">Assembly</span><span class="card-title">Writing a Tiny x86 Bootloader</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://tuhdo.github.io/os01/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Operating Systems: From 0 to 1</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://littleosbook.github.io/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">The little book about OS development</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://jamesmolloy.co.uk/tutorial_html/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Roll your own toy UNIX-clone OS</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://arjunsreedharan.org/post/82710718100/kernel-101-lets-write-a-kernel" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Kernel 101 – Let's write a Kernel</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/cfenollosa/os-tutorial" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">How to create an OS from scratch</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/s-matyukevich/raspberry-pi-os" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Learning OS development using Linux kernel and Raspberry Pi</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://www.youtube.com/playlist?list=PLHh55M_Kq4OApWScZyPl5HhgsTJS9MZ6M" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Write your own Operating System</span><span class="card-tags"><span class="ctag ctag-video">📹 Video</span></span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://3zanders.co.uk/2017/10/13/writing-a-bootloader/" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Writing a Bootloader</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://os.phil-opp.com/" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Writing an OS in Rust</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://osblog.stephenmarz.com/" target="_blank" class="card" data-lang="Rust"><span class="lpill lrs">Rust</span><span class="card-title">Add RISC-V Rust Operating System Tutorial</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://linuxfromscratch.org/lfs" target="_blank" class="card" data-lang="Any"><span class="lpill lany">Any</span><span class="card-title">Linux from scratch</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
    </div>
  </div>

  <!-- Programming Language -->
  <div class="section" id="language">
    <div class="section-head"><span class="s-emoji">🗣️</span><h2 class="s-title">Programming Language</h2><span class="s-count">17</span></div>
    <div class="cards">
      <a href="https://github.com/kanaka/mal#mal---make-a-lisp" target="_blank" class="card" data-lang="Any"><span class="lpill lany">Any</span><span class="card-title">mal — Make a Lisp (in 82+ languages)</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="http://www.buildyourownlisp.com/" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">Build Your Own Lisp: Learn C and build your own programming language in 1000 lines</span><span class="diff">⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://github.com/DoctorWkt/acwj" target="_blank" class="card" data-lang="C"><span class="lpill lc">C</span><span class="card-title">A journey explaining how to build a C compiler from scratch</span><span class="diff">⭐⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
      <a href="https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/index.html" target="_blank" class="card" data-lang="C++"><span class="lpill lcpp">C++</span><span class="card-title">Kaleidoscope: Implementing a Language with LLVM</span><span class="diff">⭐⭐⭐⭐</span><span class="card-arrow">→</span></a>
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const phrases = ['<build-your-own-x />', '<make-a-database />', '<write-an-os />', '<craft-a-compiler />', '<create-anything />'];
let pi=0, ci=0, deleting=false;
const el = document.querySelector('.mono');
if(el){
  const cursor = el.querySelector('.cursor');
  function type(){
    const phrase = phrases[pi];
    if(!deleting){
      if(ci <= phrase.length){
        el.innerHTML = phrase.slice(0,ci) + '<span class="cursor"></span>';
        ci++;
        setTimeout(type, ci===phrase.length ? 2200 : 70);
      }
    } else {
      if(ci >= 0){
        el.innerHTML = phrase.slice(0,ci) + '<span class="cursor"></span>';
        ci--;
        setTimeout(type, 40);
      } else {
        deleting=false; pi=(pi+1)%phrases.length; ci=0;
        setTimeout(type, 400);
      }
    }
    if(!deleting && ci===phrase.length+1){
      deleting=true;
      setTimeout(type, 2200);
    }
  }
  setTimeout(type, 1200);
}

// ── BACK TO TOP ──
window.addEventListener('scroll',()=>{
  document.getElementById('btt').classList.toggle('show', scrollY>400);
});

// ── SEARCH ──
const input = document.getElementById('search');
input.addEventListener('input',()=>{
  const q = input.value.toLowerCase().trim();
  const activeLang = document.querySelector('.lang-btn.active')?.dataset.lang || 'all';
  filterCards(q, activeLang);
});

// ── LANGUAGE FILTER ──
document.querySelectorAll('.lang-btn').forEach(btn=>{
  btn.addEventListener('click',()=>{
    document.querySelectorAll('.lang-btn').forEach(b=>b.classList.remove('active'));
    btn.classList.add('active');
    const q = input.value.toLowerCase().trim();
    filterCards(q, btn.dataset.lang);
  });
});

function filterCards(q, lang){
  document.querySelectorAll('.card').forEach(card=>{
    const matchQ = !q || card.textContent.toLowerCase().includes(q);
    const matchL = lang==='all' || (card.dataset.lang||'').toLowerCase().includes(lang.toLowerCase());
    card.classList.toggle('hidden', !matchQ || !matchL);
  });
  document.querySelectorAll('.section').forEach(sec=>{
    const visible = sec.querySelectorAll('.card:not(.hidden)').length;
    sec.classList.toggle('hidden', visible===0);
  });
}

// ── SCROLL REVEAL ──
const observer = new IntersectionObserver((entries)=>{
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    if(e.isIntersecting){ e.target.style.animationDelay='0s'; e.target.style.opacity='1'; }
  });
},{threshold:.07});
document.querySelectorAll('.section').forEach((s,i)=>{
  s.style.opacity='0';
  s.style.animationDelay = (i*.05)+'s';
  observer.observe(s);
});
</script>
</body>
</html>