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ShukGEN
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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>ShukGEN β€” Face Style Generator</title>
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link href="https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=DM+Sans:wght@300;400;500;600;700;800&display=swap" rel="stylesheet" />
<style>
/* ═══════════════════════════════════════════════════════════
   DESIGN TOKENS  (mirrors PyQt6 DARK palette)
═══════════════════════════════════════════════════════════ */
:root {
  --bg-dark:        #0D0F18;
  --bg-panel:       #161927;
  --bg-card:        #1E2235;
  --bg-input:       #252A3E;
  --accent:         #7B5CF0;
  --accent-hover:   #9B7FFF;
  --accent2:        #38BDF8;
  --success:        #34D399;
  --warning:        #FBBF24;
  --danger:         #F87171;
  --text-primary:   #EEF0FF;
  --text-secondary: #8B91B8;
  --text-muted:     #4A5070;
  --border:         #272C42;
  --sep:            #1E2235;

  --style0: #34D399;
  --style1: #C0392B;
  --style2: #8E44AD;
  --style3: #F59E0B;
  --style4: #EF4444;
  --style5: #F97316;
  --style6: #38BDF8;
  --style7: #14B8A6;

  --font-ui:   'DM Sans', sans-serif;
  --font-mono: 'Space Mono', monospace;

  --server: ;
}

/* LIGHT THEME */
body.light {
  --bg-dark:        #F0F2FF;
  --bg-panel:       #E4E6F5;
  --bg-card:        #D8DAF0;
  --bg-input:       #C8CAE0;
  --accent:         #7B5CF0;
  --accent-hover:   #9B7FFF;
  --accent2:        #0284C7;
  --success:        #059669;
  --warning:        #D97706;
  --danger:         #DC2626;
  --text-primary:   #0D0F18;
  --text-secondary: #3A3D5C;
  --text-muted:     #7A7DA0;
  --border:         #B0B3D0;
  --sep:            #C8CAE0;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 14px;
  overflow: hidden;
}

/* ── Layout ── */
#app { display: flex; flex-direction: column; height: 100vh; }

/* ── Title Bar ── */
#titlebar {
  display: flex; align-items: center;
  height: 58px; padding: 0 16px 0 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--sep);
  flex-shrink: 0;
}
.titlebar-strip {
  width: 5px; height: 58px; flex-shrink: 0;
  background: linear-gradient(to bottom, var(--accent), var(--accent2));
}
.titlebar-logo {
  display: flex; align-items: baseline; gap: 2px;
  margin-left: 16px;
}
.titlebar-logo .name { font-size: 20px; font-weight: 800; letter-spacing: -1px; }
.titlebar-logo .ver  { font-size: 14px; font-weight: 700; color: var(--accent); padding-top: 2px; }
.titlebar-sub { color: var(--text-secondary); font-size: 13px; margin-left: 8px; }
.spacer { flex: 1; }
.badge {
  padding: 3px 10px; border-radius: 10px;
  font-size: 11px; font-weight: 700; color: #fff;
  background: var(--accent2);
}
.badge.gpu { background: var(--success); }
#theme-btn {
  margin-left: 12px;
  background: var(--bg-input); color: var(--text-secondary);
  border: none; border-radius: 8px; padding: 6px 14px;
  font-size: 12px; font-family: var(--font-ui); cursor: pointer;
  transition: background .2s, color .2s;
}
#theme-btn:hover { background: var(--border); color: var(--text-primary); }

/* ── Body (sidebar + content) ── */
#body { display: flex; flex: 1; min-height: 0; }

/* ── Sidebar ── */
#sidebar {
  width: 300px; flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--sep);
  overflow-y: auto;
  padding: 20px 16px;
  display: flex; flex-direction: column; gap: 4px;
}

/* ── Section Headers ── */
.section-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 6px;
}
.section-header .bar {
  width: 3px; height: 18px; border-radius: 2px;
  background: var(--accent); flex-shrink: 0;
}
.section-header span { font-size: 13px; font-weight: 700; }

.hs { height: 1px; background: var(--sep); margin: 10px 0; }

/* ── Buttons ── */
.btn {
  display: flex; align-items: center; justify-content: center;
  gap: 6px; width: 100%; padding: 9px 18px;
  font-size: 13px; font-weight: 600; font-family: var(--font-ui);
  border: none; border-radius: 8px; cursor: pointer;
  transition: background .18s, transform .1s, box-shadow .2s;
  letter-spacing: .3px; text-decoration: none;
}
.btn:active { transform: scale(.98); }
.btn-primary   { background: var(--accent);    color: #fff; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 0 18px rgba(123,92,240,.35); }
.btn-success   { background: var(--success);   color: #fff; }
.btn-success:hover { background: #52E8A8; }
.btn-secondary { background: var(--bg-input);  color: var(--text-primary); }
.btn-secondary:hover { background: var(--border); }
.btn-ghost     { background: transparent; color: var(--text-secondary);
                 border: 1px solid rgba(123,92,240,.27); }
.btn-ghost:hover { background: var(--bg-card); }
.btn-danger    { background: var(--danger);    color: #fff; }

.label-muted { color: var(--text-muted); font-size: 11px; margin-top: 3px; word-break: break-all; }
.label-status { font-size: 11px; font-weight: 600; }
.label-status.ok  { color: var(--success); }
.label-status.err { color: var(--danger); }

/* Input preview box */
#input-preview-box {
  width: 100%; height: 190px;
  background: var(--bg-input); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; margin-top: 8px; position: relative;
}
#input-preview-box img {
  width: 100%; height: 100%; object-fit: contain;
}
.img-placeholder {
  color: var(--text-muted); font-size: 12px; text-align: center;
  pointer-events: none;
}

/* Progress bar */
.progress-wrap { height: 6px; background: var(--bg-input); border-radius: 4px; overflow: hidden; margin: 6px 0; }
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(to right, var(--accent), var(--accent2));
  border-radius: 4px; transition: width .4s ease;
}

/* Quick guide */
.quick-guide {
  background: var(--bg-input); border-radius: 10px;
  padding: 12px 14px; margin-top: auto;
}
.quick-guide .title { color: var(--warning); font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.quick-guide p      { color: var(--text-secondary); font-size: 11px; margin: 2px 0; }

/* ── Content Area ── */
#content { flex: 1; display: flex; flex-direction: column; min-width: 0; overflow: hidden; }

/* ── Tabs ── */
.tab-bar {
  display: flex; background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.tab {
  padding: 10px 20px; font-size: 12px; font-weight: 500;
  color: var(--text-secondary); border: none; background: none;
  cursor: pointer; font-family: var(--font-ui);
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s, background .15s;
}
.tab:hover { background: var(--bg-card); color: var(--text-primary); }
.tab.active { color: var(--text-primary); border-bottom-color: var(--accent); background: var(--bg-dark); }

.tab-content { display: none; flex: 1; flex-direction: column; min-height: 0; overflow: hidden; }
.tab-content.active { display: flex; }

/* Tab header strip */
.tab-header {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px; background: var(--bg-panel);
  border-bottom: 1px solid var(--sep); flex-shrink: 0;
}
.tab-header .th-title { font-size: 16px; font-weight: 700; }
.tab-header .th-sub   { font-size: 12px; color: var(--text-muted); }

/* ── Style Gallery ── */
#gallery-scroll { flex: 1; overflow-y: auto; padding: 16px; }
#gallery-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

/* Style cards */
.style-card {
  background: var(--bg-card); border-radius: 12px;
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .2s;
}
.style-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.35); }
.card-accent-bar { height: 4px; flex-shrink: 0; }
.card-img-wrap {
  width: 100%; aspect-ratio: 1;
  background: var(--bg-card);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; cursor: pointer;
}
.card-img-wrap img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-img-placeholder {
  color: var(--text-muted); font-size: 11px; text-align: center; padding: 8px;
}
.card-meta { padding: 6px 10px 0; }
.card-style-num { font-size: 11px; font-weight: 700; }
.card-style-name { font-size: 12px; font-weight: 600; margin-top: 2px; }
.card-btns {
  display: flex; gap: 6px; padding: 6px 8px 10px;
}
.card-btn {
  flex: 1; padding: 4px 8px; font-size: 11px; font-weight: 600;
  border: none; border-radius: 6px; cursor: pointer; font-family: var(--font-ui);
  background: var(--bg-input); color: var(--text-secondary);
  transition: background .15s, color .15s;
}
.card-btn:hover { background: var(--border); color: var(--text-primary); }
.card-btn.save { color: #fff; }

/* ── Compare Tab ── */
#compare-area {
  flex: 1; overflow-y: auto; padding: 20px;
  display: flex; gap: 16px; align-items: flex-start;
}
.compare-panel {
  background: var(--bg-card); border-radius: 12px; overflow: hidden;
  flex: 1; max-width: 320px; display: flex; flex-direction: column;
}
.compare-panel-header {
  padding: 10px 14px; font-size: 12px; font-weight: 700;
  border-bottom: 3px solid var(--accent);
}
.compare-img-wrap {
  width: 100%; aspect-ratio: 1; background: var(--bg-card);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.compare-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.compare-panel-footer { padding: 8px; }
.compare-panel-footer button {
  width: 100%; padding: 6px 12px; font-size: 11px;
  background: var(--bg-input); color: var(--text-secondary);
  border: none; border-radius: 6px; cursor: pointer; font-family: var(--font-ui);
}
.compare-panel-footer button:hover { background: var(--border); color: var(--text-primary); }
.compare-select {
  padding: 8px;
  display: flex; align-items: center; gap: 8px;
}
.compare-select label { font-size: 12px; color: var(--text-secondary); flex-shrink: 0; }
.compare-select select {
  flex: 1; padding: 5px 8px;
  background: var(--bg-input); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 12px; font-family: var(--font-ui);
}

/* ── Strength Tab ── */
#strength-area {
  flex: 1; overflow-y: auto; padding: 24px;
  display: flex; gap: 40px; align-items: flex-start; flex-wrap: wrap;
}
.strength-controls { display: flex; flex-direction: column; gap: 10px; min-width: 220px; }
.strength-controls label { font-size: 13px; font-weight: 700; }
.radio-group { display: flex; flex-direction: column; gap: 6px; }
.radio-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-secondary); cursor: pointer;
}
.radio-item input[type=radio] { accent-color: var(--accent); width: 16px; height: 16px; }
.radio-item:has(input:checked) { color: var(--text-primary); }
.alpha-display {
  font-size: 28px; font-weight: 800; color: var(--accent);
  font-family: var(--font-mono); letter-spacing: -1px;
}
input[type=range] {
  width: 280px; accent-color: var(--accent);
  cursor: pointer;
}
.preset-row { display: flex; gap: 6px; flex-wrap: wrap; }
.preset-btn {
  padding: 4px 10px; border-radius: 6px; font-size: 11px;
  background: var(--bg-input); color: var(--text-secondary);
  border: none; cursor: pointer; font-family: var(--font-ui);
  transition: background .15s;
}
.preset-btn:hover { background: var(--border); color: var(--text-primary); }
.strength-previews { display: flex; gap: 12px; flex-wrap: wrap; }
.strength-preview-card {
  background: var(--bg-card); border-radius: 10px; overflow: hidden;
  display: flex; flex-direction: column; width: 200px;
}
.strength-preview-card .card-label {
  padding: 6px 10px; font-size: 11px; font-weight: 700;
  color: var(--text-secondary); background: var(--bg-panel);
}
.strength-preview-card img,
.strength-preview-card .img-ph {
  width: 100%; aspect-ratio: 1; object-fit: cover;
  background: var(--bg-input); display: flex;
  align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 11px; text-align: center;
}

/* ── Latent Walk Tab ── */
#walk-controls {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  padding: 16px 20px; background: var(--bg-panel);
  border-bottom: 1px solid var(--sep); flex-shrink: 0;
}
#walk-controls label { font-size: 12px; color: var(--text-secondary); }
#walk-controls select, #walk-controls input[type=number] {
  padding: 5px 10px;
  background: var(--bg-input); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 12px; font-family: var(--font-ui);
}
#walk-scroll { flex: 1; overflow: auto; padding: 16px; }
#walk-frames-row { display: flex; gap: 8px; flex-wrap: wrap; }
.walk-frame-card {
  background: var(--bg-card); border-radius: 8px; overflow: hidden;
  display: flex; flex-direction: column; width: 150px; flex-shrink: 0;
}
.walk-frame-card .wf-bar { height: 3px; }
.walk-frame-card img { width: 150px; height: 150px; object-fit: cover; }
.walk-frame-card .wf-label {
  text-align: center; font-size: 10px; color: var(--text-muted);
  padding: 4px 0; font-family: var(--font-mono);
}

/* ── Status Bar ── */
#statusbar {
  height: 32px; padding: 0 16px;
  background: var(--bg-panel); border-top: 1px solid var(--sep);
  display: flex; align-items: center; gap: 12px; flex-shrink: 0;
  font-size: 11px; color: var(--text-muted);
}
#status-text { flex: 1; }
#server-indicator { font-size: 11px; font-weight: 600; }
#server-indicator.ok  { color: var(--success); }
#server-indicator.err { color: var(--danger); }

/* ── Lightbox ── */
#lightbox {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.85); z-index: 9999;
  align-items: center; justify-content: center;
  cursor: zoom-out;
}
#lightbox.show { display: flex; }
#lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 8px; object-fit: contain; }

/* ── Scrollbars ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-panel); }
::-webkit-scrollbar-thumb { background: var(--bg-input); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Server URL bar ── */
.server-row {
  display: flex; align-items: center; gap: 6px; margin-bottom: 6px;
}
.server-row input {
  flex: 1; padding: 6px 10px;
  background: var(--bg-input); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 6px;
  font-size: 11px; font-family: var(--font-mono);
}
.server-row button {
  padding: 6px 10px; background: var(--accent); color: #fff;
  border: none; border-radius: 6px; font-size: 11px; cursor: pointer;
}

/* ── Model path input ── */
.path-row {
  display: flex; gap: 6px; align-items: stretch; margin-bottom: 4px;
}
.path-row input {
  flex: 1; padding: 7px 10px;
  background: var(--bg-input); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: 8px;
  font-size: 11px; font-family: var(--font-mono);
  min-width: 0;
}
.path-row input::placeholder { color: var(--text-muted); }
.path-row button {
  padding: 7px 12px; background: var(--accent); color: #fff;
  border: none; border-radius: 8px; font-size: 12px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
}
.path-row button:hover { background: var(--accent-hover); }

/* drag-and-drop zone */
#drop-zone {
  border: 2px dashed var(--border); border-radius: 8px;
  padding: 16px 10px; text-align: center; cursor: pointer;
  color: var(--text-muted); font-size: 12px;
  transition: border-color .2s, background .2s;
  margin-top: 8px;
}
#drop-zone.over { border-color: var(--accent); background: rgba(123,92,240,.08); }
#drop-zone input { display: none; }

@media (max-width: 900px) {
  #gallery-grid { grid-template-columns: repeat(2, 1fr); }
  #sidebar { width: 260px; }
}
</style>
</head>
<body>

<!-- Lightbox -->
<div id="lightbox" onclick="closeLightbox()">
  <img id="lightbox-img" src="" alt="Preview" />
</div>

<div id="app">

  <!-- ── Title Bar ── -->
  <div id="titlebar">
    <div class="titlebar-strip"></div>
    <div class="titlebar-logo">
      <span class="name">ShukGEN</span>
    </div>
    <span class="titlebar-sub">β€” Face Style Generator</span>
    <div class="spacer"></div>
    <span class="badge" id="device-badge">πŸ–₯ CPU</span>
    <button id="theme-btn" onclick="toggleTheme()">β˜€ Light Mode</button>
  </div>

  <!-- ── Body ── -->
  <div id="body">

    <!-- ══ SIDEBAR ══ -->
    <div id="sidebar">

      <!-- Server -->
      <div class="section-header">
        <div class="bar"></div><span>πŸ”Œ Server</span>
      </div>
      <div class="server-row">
        <input id="server-url-input" type="text" value="" />
        <button onclick="pingServer()">Connect</button>
      </div>
      <div id="server-status" class="label-muted">Not connected β€” start server.py first</div>

      <div class="hs"></div>

      <!-- Step 1: Load Model -->
      <div class="section-header">
        <div class="bar"></div><span>β‘  Load Model</span>
      </div>
      <div class="path-row">
        <input id="model-path-input" type="text" placeholder="Paste full path to .pth file…" />
        <button onclick="loadModel()">Load</button>
      </div>
      <div id="model-path-label" class="label-muted">No model loaded</div>
      <div id="model-badge" class="label-status err">● Not Loaded</div>

      <div class="hs"></div>

      <!-- Step 2: Upload Image -->
      <div class="section-header">
        <div class="bar"></div><span>β‘‘ Upload Face Image</span>
      </div>
      <div id="drop-zone" onclick="document.getElementById('file-input').click()"
           ondragover="event.preventDefault(); this.classList.add('over')"
           ondragleave="this.classList.remove('over')"
           ondrop="handleDrop(event)">
        <input type="file" id="file-input" accept="image/*" onchange="handleFileSelect(event)" />
        πŸ–Ό Click or drag & drop a face image
      </div>
      <div id="img-path-label" class="label-muted" style="margin-top:4px;">No image selected</div>
      <div id="input-preview-box">
        <span class="img-placeholder">Upload a face image</span>
      </div>

      <div class="hs"></div>

      <!-- Step 3: Generate -->
      <div class="section-header">
        <div class="bar"></div><span>β‘’ Generate Styles</span>
      </div>
      <button class="btn btn-success" onclick="generateAll()">✨ Generate All 8 Styles</button>
      <div class="progress-wrap" style="margin-top:6px;">
        <div class="progress-fill" id="progress-fill"></div>
      </div>
      <div id="gen-status" class="label-muted">Ready</div>

      <div class="hs"></div>

      <!-- Step 4: Export -->
      <div class="section-header">
        <div class="bar"></div><span>β‘£ Export & Tools</span>
      </div>
      <button class="btn btn-secondary" onclick="saveAll()" style="margin-bottom:4px;">πŸ’Ύ Save All Outputs</button>
      <button class="btn btn-ghost" onclick="showAbout()">ℹ️ Architecture Info</button>

      <!-- Quick Guide -->
      <div class="quick-guide" style="margin-top:16px;">
        <div class="title">πŸ’‘ Quick Guide</div>
        <p>1. Start server.py, then Connect</p>
        <p>2. Paste .pth model path, click Load</p>
        <p>3. Upload a face photo</p>
        <p>4. Click Generate All Styles</p>
        <p>5. Preview / Save any result</p>
        <p>6. Try Strength &amp; Walk tabs!</p>
      </div>

    </div><!-- /sidebar -->

    <!-- ══ CONTENT ══ -->
    <div id="content">

      <!-- Tab bar -->
      <div class="tab-bar">
        <button class="tab active" onclick="switchTab('gallery', this)">🎨 Style Gallery</button>
        <button class="tab" onclick="switchTab('compare', this)">πŸ” Compare</button>
        <button class="tab" onclick="switchTab('strength', this)">🎚 Strength</button>
        <button class="tab" onclick="switchTab('walk', this)">🚢 Latent Walk</button>
      </div>

      <!-- ── Tab: Gallery ── -->
      <div class="tab-content active" id="tab-gallery">
        <div class="tab-header">
          <span class="th-title">8 Visually Distinct Style Variants</span>
          <span class="th-sub">Each style applies different pixel transforms β€” mathematically guaranteed to look distinct</span>
        </div>
        <div id="gallery-scroll">
          <div id="gallery-grid">
            <!-- Cards built by JS -->
          </div>
        </div>
      </div>

      <!-- ── Tab: Compare ── -->
      <div class="tab-content" id="tab-compare">
        <div class="tab-header">
          <span class="th-title">Original vs Reconstruction vs Styled</span>
        </div>
        <div id="compare-area">
          <!-- Original -->
          <div class="compare-panel">
            <div class="compare-panel-header" style="border-color: var(--accent2);">Original Input</div>
            <div class="compare-img-wrap" id="cmp-orig-wrap">
              <span class="img-placeholder" style="color:var(--text-muted);font-size:11px;">Upload image first</span>
            </div>
            <div class="compare-panel-footer">
              <button onclick="openLightbox('orig')">πŸ‘ Full Size Preview</button>
            </div>
          </div>
          <!-- Reconstruction -->
          <div class="compare-panel">
            <div class="compare-panel-header" style="border-color: var(--success);">VAE Reconstruction</div>
            <div class="compare-img-wrap" id="cmp-recon-wrap">
              <span class="img-placeholder" style="color:var(--text-muted);font-size:11px;">Generate first</span>
            </div>
            <div class="compare-panel-footer">
              <button onclick="openLightbox('recon')">πŸ‘ Full Size Preview</button>
            </div>
          </div>
          <!-- Styled -->
          <div class="compare-panel">
            <div class="compare-panel-header" style="border-color: var(--accent);">Styled Version</div>
            <div class="compare-img-wrap" id="cmp-styled-wrap">
              <span class="img-placeholder" style="color:var(--text-muted);font-size:11px;">Generate first</span>
            </div>
            <div class="compare-select">
              <label>Style:</label>
              <select id="compare-style-sel" onchange="updateCompareStyled()"></select>
            </div>
            <div class="compare-panel-footer">
              <button onclick="openLightbox('styled')">πŸ‘ Full Size Preview</button>
            </div>
          </div>
        </div>
      </div>

      <!-- ── Tab: Strength ── -->
      <div class="tab-content" id="tab-strength">
        <div class="tab-header">
          <span class="th-title">Style Strength Control (Ξ±-Blending)</span>
          <span class="th-sub">Ξ±=0 β†’ pure reconstruction &nbsp;|&nbsp; Ξ±=1 β†’ full style effect</span>
        </div>
        <div id="strength-area">
          <div class="strength-controls">
            <label>Select Style:</label>
            <div class="radio-group" id="strength-radio-group">
              <!-- built by JS -->
            </div>
            <div style="margin-top:16px;">
              <label>Blend Strength (Ξ±):</label>
              <div class="alpha-display" id="alpha-display">Ξ± = 1.00</div>
              <input type="range" id="alpha-slider" min="0" max="100" value="100"
                     oninput="onAlphaChange(this.value)" style="margin: 8px 0;" />
              <div class="preset-row">
                <button class="preset-btn" onclick="setAlpha(0)">0%</button>
                <button class="preset-btn" onclick="setAlpha(25)">25%</button>
                <button class="preset-btn" onclick="setAlpha(50)">50%</button>
                <button class="preset-btn" onclick="setAlpha(75)">75%</button>
                <button class="preset-btn" onclick="setAlpha(100)">100%</button>
              </div>
            </div>
            <button class="btn btn-primary" onclick="updateStrengthPreview()" style="margin-top:12px;">
              πŸ”„ Update Preview
            </button>
          </div>
          <div class="strength-previews">
            <div class="strength-preview-card">
              <div class="card-label">Reconstruction</div>
              <div id="sp-recon" class="img-ph" style="display:flex;align-items:center;justify-content:center;min-height:200px;">Generate first</div>
            </div>
            <div class="strength-preview-card">
              <div class="card-label">Blended (Ξ±)</div>
              <div id="sp-blend" class="img-ph" style="display:flex;align-items:center;justify-content:center;min-height:200px;">Generate first</div>
            </div>
            <div class="strength-preview-card">
              <div class="card-label">Full Style</div>
              <div id="sp-styled" class="img-ph" style="display:flex;align-items:center;justify-content:center;min-height:200px;">Generate first</div>
            </div>
          </div>
        </div>
      </div>

      <!-- ── Tab: Latent Walk ── -->
      <div class="tab-content" id="tab-walk">
        <div class="tab-header">
          <span class="th-title">Latent Space Walk</span>
          <span class="th-sub">Traverse the VAE latent space between two style directions</span>
        </div>
        <div id="walk-controls">
          <label>Style A:
            <select id="walk-style-a"></select>
          </label>
          <label>Style B:
            <select id="walk-style-b"></select>
          </label>
          <label>Steps:
            <input type="number" id="walk-steps" value="7" min="2" max="16" style="width:60px;" />
          </label>
          <button class="btn btn-primary" style="width:auto;padding:8px 20px;" onclick="runWalk()">
            🚢 Run Walk
          </button>
          <span id="walk-status" style="font-size:11px;color:var(--text-muted);">Generate styles first</span>
        </div>
        <div id="walk-scroll">
          <div id="walk-frames-row">
            <span style="color:var(--text-muted);font-size:12px;">Run a latent walk to see frames here.</span>
          </div>
        </div>
      </div>

    </div><!-- /content -->
  </div><!-- /body -->

  <!-- ── Status Bar ── -->
  <div id="statusbar">
    <span id="status-text">Ready β€” start server.py and click Connect</span>
    <span id="server-indicator" class="err">● Disconnected</span>
  </div>

</div><!-- /app -->

<!-- About dialog -->
<div id="about-overlay" style="display:none;position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:8888;align-items:center;justify-content:center;">
  <div style="background:var(--bg-dark);border-radius:12px;max-width:560px;width:90%;max-height:80vh;overflow-y:auto;padding:24px;">
    <h2 style="font-size:18px;font-weight:800;margin-bottom:8px;">ShukGEN β€” Architecture Info</h2>
    <pre id="about-text" style="font-family:var(--font-mono);font-size:11px;color:var(--text-secondary);white-space:pre-wrap;line-height:1.6;"></pre>
    <button class="btn btn-secondary" style="margin-top:16px;" onclick="document.getElementById('about-overlay').style.display='none'">Close</button>
  </div>
</div>

<script>
// ═══════════════════════════════════════════════════════════
//  CONSTANTS
// ═══════════════════════════════════════════════════════════
const STYLE_NAMES = [
  "Youthful", "Aged / Mature", "Dramatic Light", "Soft Glow",
  "Intense / Bold", "Warm Golden Hour", "Cool / Moody", "Sketch / Artistic",
];
const STYLE_ICONS  = ["🌸","🌿","⚑","✨","πŸ”₯","πŸŒ…","🌊","🎨"];
const STYLE_COLORS = ["#34D399","#C0392B","#8E44AD","#F59E0B","#EF4444","#F97316","#38BDF8","#14B8A6"];

// ═══════════════════════════════════════════════════════════
//  STATE
// ═══════════════════════════════════════════════════════════
const S = {
  serverURL:   '',
  modelLoaded: false,
  imageLoaded: false,
  generated:   false,
  origB64:     null,
  reconB64:    null,
  styledB64:   new Array(8).fill(null),
  uploadedImg: null, // File object
};

// ═══════════════════════════════════════════════════════════
//  SERVER HELPERS
// ═══════════════════════════════════════════════════════════
function getURL() {
  return document.getElementById('server-url-input').value.replace(/\/$/, '');
}

async function apiFetch(path, opts = {}) {
  const url = getURL() + path;
  const res = await fetch(url, {
    headers: { 'Content-Type': 'application/json' },
    ...opts,
  });
  return res.json();
}

// ═══════════════════════════════════════════════════════════
//  PING / CONNECT
// ═══════════════════════════════════════════════════════════
async function pingServer() {
  setStatus('Connecting to server…');
  try {
    const data = await apiFetch('/status');
    document.getElementById('server-status').textContent = 'βœ… Connected';
    document.getElementById('server-indicator').textContent = '● Connected';
    document.getElementById('server-indicator').className = 'ok';

    // Device badge
    const badge = document.getElementById('device-badge');
    if (data.device && data.device.startsWith('GPU')) {
      badge.textContent = '⚑ ' + data.device;
      badge.classList.add('gpu');
    } else {
      badge.textContent = 'πŸ–₯ ' + (data.device || 'CPU');
    }

    setStatus(`Connected β€” PyTorch ${data.torch_version} | ${data.device}`);

    if (data.model_loaded) {
      S.modelLoaded = true;
      document.getElementById('model-badge').textContent = '● Loaded';
      document.getElementById('model-badge').className = 'label-status ok';
      const cfg = data.model_config;
      document.getElementById('model-path-label').textContent =
        `latent_dim=${cfg.latent_dim} | base_filters=${cfg.base_filters} | img_size=${data.image_size || '?'}`;
    }
  } catch (e) {
    document.getElementById('server-status').textContent = '❌ Cannot reach server β€” is server.py running?';
    document.getElementById('server-indicator').textContent = '● Disconnected';
    document.getElementById('server-indicator').className = 'err';
    setStatus('Cannot reach server. Start server.py first.');
  }
}

// ═══════════════════════════════════════════════════════════
//  LOAD MODEL
// ═══════════════════════════════════════════════════════════
async function loadModel() {
  const path = document.getElementById('model-path-input').value.trim();
  if (!path) { alert('Please paste the full path to your .pth file.'); return; }
  setStatus('⏳ Loading model…');
  try {
    const data = await apiFetch('/load_model', {
      method: 'POST',
      body: JSON.stringify({ path }),
    });
    if (data.error) {
      setStatus('❌ ' + data.error);
      document.getElementById('model-badge').textContent = '● Load Failed';
      document.getElementById('model-badge').className = 'label-status err';
      alert('Model load error:\n' + data.error);
      return;
    }
    S.modelLoaded = true;
    document.getElementById('model-badge').textContent = '● Loaded βœ“';
    document.getElementById('model-badge').className = 'label-status ok';
    document.getElementById('model-path-label').textContent =
      `${data.filename}  |  latent=${data.config.latent_dim}  base_f=${data.config.base_filters}  img=${data.image_size}`;
    setStatus(`βœ… Model loaded: ${data.filename}`);
  } catch (e) {
    setStatus('❌ Network error β€” is server running?');
  }
}

// ═══════════════════════════════════════════════════════════
//  IMAGE UPLOAD
// ═══════════════════════════════════════════════════════════
function handleDrop(e) {
  e.preventDefault();
  document.getElementById('drop-zone').classList.remove('over');
  const file = e.dataTransfer.files[0];
  if (file && file.type.startsWith('image/')) loadImageFile(file);
}
function handleFileSelect(e) {
  const file = e.target.files[0];
  if (file) loadImageFile(file);
}

function loadImageFile(file) {
  const reader = new FileReader();
  reader.onload = async (ev) => {
    const b64 = ev.target.result;
    S.origB64 = b64;
    S.imageLoaded = true;
    document.getElementById('img-path-label').textContent = file.name;

    // Show preview in sidebar
    const box = document.getElementById('input-preview-box');
    box.innerHTML = `<img src="${b64}" style="width:100%;height:100%;object-fit:contain;" />`;

    // Update compare original
    updateCompareOrig(b64);

    setStatus('πŸ–Ό Image loaded: ' + file.name);

    // Send to server
    try {
      const data = await apiFetch('/load_image', {
        method: 'POST',
        body: JSON.stringify({ image_b64: b64 }),
      });
      if (data.error) setStatus('❌ Image upload error: ' + data.error);
    } catch (e) {
      setStatus('⚠ Could not send image to server β€” check connection.');
    }
  };
  reader.readAsDataURL(file);
}

// ═══════════════════════════════════════════════════════════
//  GENERATE
// ═══════════════════════════════════════════════════════════
async function generateAll() {
  if (!S.modelLoaded) { alert('Load a model first.'); return; }
  if (!S.imageLoaded) { alert('Upload an image first.'); return; }

  setProgress(0);
  setGenStatus('⏳ Encoding face with VAE…');
  setStatus('⏳ Encoding face with VAE…');

  // Set all cards to loading
  for (let i = 0; i < 8; i++) setCardLoading(i);

  try {
    const data = await apiFetch('/generate', { method: 'POST', body: '{}' });
    if (data.error) {
      setGenStatus('❌ Error');
      setStatus('❌ Generate error: ' + data.error);
      alert('Generation error:\n' + data.error);
      return;
    }

    S.reconB64   = data.recon;
    S.styledB64  = data.styles;
    S.generated  = true;

    setProgress(100);

    // Update gallery cards
    for (let i = 0; i < 8; i++) setCardImage(i, data.styles[i]);

    // Update compare tab
    updateCompareRecon(data.recon);
    updateCompareStyled();

    // Update strength previews (recon panel)
    setImgOrPh('sp-recon', data.recon);

    setGenStatus('βœ… Done β€” 8 styles generated!');
    setStatus('βœ… All 8 styles generated successfully.');
  } catch (e) {
    setGenStatus('❌ Network error');
    setStatus('❌ Generation failed β€” is server running?');
  }
}

// ═══════════════════════════════════════════════════════════
//  STRENGTH PREVIEW
// ═══════════════════════════════════════════════════════════
function onAlphaChange(val) {
  const v = (val / 100).toFixed(2);
  document.getElementById('alpha-display').textContent = `Ξ± = ${v}`;
}
function setAlpha(val) {
  document.getElementById('alpha-slider').value = val;
  onAlphaChange(val);
}

async function updateStrengthPreview() {
  if (!S.generated) { alert('Generate styles first.'); return; }
  const styleIdx = getCheckedRadio();
  const alpha    = document.getElementById('alpha-slider').value / 100;

  // Recon always shown
  setImgOrPh('sp-recon', S.reconB64);
  // Full styled
  setImgOrPh('sp-styled', S.styledB64[styleIdx]);

  // Blend from server
  try {
    const data = await apiFetch('/strength_preview', {
      method: 'POST',
      body: JSON.stringify({ style_idx: styleIdx, alpha }),
    });
    if (data.blend) setImgOrPh('sp-blend', data.blend);
  } catch (e) {
    setStatus('❌ Strength preview failed');
  }
}

function getCheckedRadio() {
  const radios = document.querySelectorAll('#strength-radio-group input[type=radio]');
  for (let r of radios) if (r.checked) return parseInt(r.value);
  return 0;
}

// ═══════════════════════════════════════════════════════════
//  LATENT WALK
// ═══════════════════════════════════════════════════════════
async function runWalk() {
  if (!S.generated) { alert('Generate styles first.'); return; }
  const styleA = parseInt(document.getElementById('walk-style-a').value);
  const styleB = parseInt(document.getElementById('walk-style-b').value);
  const steps  = parseInt(document.getElementById('walk-steps').value);
  document.getElementById('walk-status').textContent = '⏳ Running…';
  document.getElementById('walk-frames-row').innerHTML =
    '<span style="color:var(--text-muted);font-size:12px;">Generating frames…</span>';

  try {
    const data = await apiFetch('/latent_walk', {
      method: 'POST',
      body: JSON.stringify({ style_a: styleA, style_b: styleB, steps }),
    });
    if (data.error) {
      document.getElementById('walk-status').textContent = '❌ ' + data.error;
      return;
    }
    const row = document.getElementById('walk-frames-row');
    row.innerHTML = '';
    data.frames.forEach((f, i) => {
      const color = f.alpha < 0.5 ? STYLE_COLORS[styleA] : STYLE_COLORS[styleB];
      const card = document.createElement('div');
      card.className = 'walk-frame-card';
      card.innerHTML = `
        <div class="wf-bar" style="background:${color};"></div>
        <img src="${f.img}" loading="lazy" onclick="openLightboxSrc('${f.img}')" style="cursor:zoom-in;" />
        <div class="wf-label">Ξ±=${f.alpha.toFixed(2)}</div>
      `;
      row.appendChild(card);
    });
    document.getElementById('walk-status').textContent =
      `βœ… ${data.frames.length} frames: ${STYLE_NAMES[styleA]} β†’ ${STYLE_NAMES[styleB]}`;
    setStatus(`βœ… Latent walk: ${data.frames.length} frames`);
  } catch (e) {
    document.getElementById('walk-status').textContent = '❌ Network error';
    setStatus('❌ Walk failed β€” is server running?');
  }
}

// ═══════════════════════════════════════════════════════════
//  COMPARE TAB
// ═══════════════════════════════════════════════════════════
function updateCompareOrig(b64) {
  setImgInWrap('cmp-orig-wrap', b64, 'Original');
}
function updateCompareRecon(b64) {
  setImgInWrap('cmp-recon-wrap', b64, 'Reconstruction');
}
function updateCompareStyled() {
  const idx = parseInt(document.getElementById('compare-style-sel').value);
  const b64 = S.styledB64[idx];
  if (b64) setImgInWrap('cmp-styled-wrap', b64, STYLE_NAMES[idx]);
  else {
    document.getElementById('cmp-styled-wrap').innerHTML =
      `<span class="img-placeholder" style="color:var(--text-muted);font-size:11px;">Generate first</span>`;
  }
}

function setImgInWrap(id, b64, label) {
  const wrap = document.getElementById(id);
  wrap.innerHTML = `<img src="${b64}" style="width:100%;height:100%;object-fit:cover;" alt="${label}" onclick="openLightboxSrc('${b64}')" style="cursor:zoom-in;" />`;
}

// ═══════════════════════════════════════════════════════════
//  SAVE
// ═══════════════════════════════════════════════════════════
function downloadB64(b64, filename) {
  const a = document.createElement('a');
  a.href     = b64;
  a.download = filename;
  a.click();
}

function saveStyle(idx) {
  const b64 = S.styledB64[idx];
  if (!b64) { alert('Generate styles first.'); return; }
  const name = STYLE_NAMES[idx].replace(/[/ ]+/g, '_').toLowerCase();
  downloadB64(b64, `shukgen_v3_style_${idx}_${name}.png`);
  setStatus(`πŸ’Ύ Saved style ${idx}: ${STYLE_NAMES[idx]}`);
}

async function saveAll() {
  if (!S.generated && !S.imageLoaded) { alert('Generate styles first.'); return; }
  if (S.origB64)  downloadB64(S.origB64,  '00_original.png');
  if (S.reconB64) downloadB64(S.reconB64, '01_reconstruction.png');
  S.styledB64.forEach((b64, i) => {
    if (b64) {
      const name = STYLE_NAMES[i].replace(/[/ ]+/g, '_').toLowerCase();
      setTimeout(() => downloadB64(b64, `style_${String(i).padStart(2,'0')}_${name}.png`), i * 100);
    }
  });
  setStatus('πŸ’Ύ Saving all generated images…');
}

// ═══════════════════════════════════════════════════════════
//  LIGHTBOX
// ═══════════════════════════════════════════════════════════
const _lightboxSrcs = {};
function openLightbox(key) {
  const srcs = { orig: S.origB64, recon: S.reconB64, styled: S.styledB64[parseInt(document.getElementById('compare-style-sel').value)] };
  const src = srcs[key];
  if (!src) return;
  openLightboxSrc(src);
}
function openLightboxSrc(src) {
  document.getElementById('lightbox-img').src = src;
  document.getElementById('lightbox').classList.add('show');
}
function closeLightbox() {
  document.getElementById('lightbox').classList.remove('show');
}

// ═══════════════════════════════════════════════════════════
//  GALLERY CARDS
// ═══════════════════════════════════════════════════════════
function buildGallery() {
  const grid = document.getElementById('gallery-grid');
  grid.innerHTML = '';
  for (let i = 0; i < 8; i++) {
    const color = STYLE_COLORS[i];
    const card = document.createElement('div');
    card.className = 'style-card';
    card.id = `card-${i}`;
    card.innerHTML = `
      <div class="card-accent-bar" style="background:${color};"></div>
      <div class="card-img-wrap" id="card-img-wrap-${i}" onclick="previewStyle(${i})">
        <span class="card-img-placeholder">Pending…</span>
      </div>
      <div class="card-meta">
        <div class="card-style-num" style="color:${color};">${STYLE_ICONS[i]}  Style ${i}</div>
        <div class="card-style-name">${STYLE_NAMES[i]}</div>
      </div>
      <div class="card-btns">
        <button class="card-btn" onclick="previewStyle(${i})">πŸ‘ Preview</button>
        <button class="card-btn save" style="background:${color};" onclick="saveStyle(${i})">πŸ’Ύ Save</button>
      </div>
    `;
    grid.appendChild(card);
  }
}

function setCardLoading(i) {
  document.getElementById(`card-img-wrap-${i}`).innerHTML =
    '<span class="card-img-placeholder">Generating…</span>';
}
function setCardImage(i, b64) {
  document.getElementById(`card-img-wrap-${i}`).innerHTML =
    `<img src="${b64}" alt="${STYLE_NAMES[i]}" />`;
}
function previewStyle(i) {
  if (!S.styledB64[i]) { alert('Generate styles first.'); return; }
  openLightboxSrc(S.styledB64[i]);
}

// ═══════════════════════════════════════════════════════════
//  COMPARE STYLE SELECT
// ═══════════════════════════════════════════════════════════
function buildCompareSelect() {
  const sel = document.getElementById('compare-style-sel');
  sel.innerHTML = '';
  STYLE_NAMES.forEach((n, i) => {
    const opt = document.createElement('option');
    opt.value = i; opt.textContent = `${i}: ${n}`;
    sel.appendChild(opt);
  });
}

// ═══════════════════════════════════════════════════════════
//  STRENGTH RADIO GROUP
// ═══════════════════════════════════════════════════════════
function buildStrengthRadios() {
  const group = document.getElementById('strength-radio-group');
  group.innerHTML = '';
  STYLE_NAMES.forEach((n, i) => {
    const lbl = document.createElement('label');
    lbl.className = 'radio-item';
    lbl.innerHTML = `
      <input type="radio" name="strength-style" value="${i}" ${i===0?'checked':''} />
      ${STYLE_ICONS[i]} ${n}
    `;
    group.appendChild(lbl);
  });
}

// ═══════════════════════════════════════════════════════════
//  WALK SELECTS
// ═══════════════════════════════════════════════════════════
function buildWalkSelects() {
  ['walk-style-a','walk-style-b'].forEach((id, j) => {
    const sel = document.getElementById(id);
    sel.innerHTML = '';
    STYLE_NAMES.forEach((n, i) => {
      const opt = document.createElement('option');
      opt.value = i; opt.textContent = `${i}: ${n}`;
      if (j === 0 && i === 0) opt.selected = true;
      if (j === 1 && i === 1) opt.selected = true;
      sel.appendChild(opt);
    });
  });
}

// ═══════════════════════════════════════════════════════════
//  ABOUT
// ═══════════════════════════════════════════════════════════
function showAbout() {
  const overlay = document.getElementById('about-overlay');
  overlay.style.display = 'flex';
  fetch(getURL() + '/status').then(r => r.json()).then(data => {
    const cfg = data.model_config || {};
    document.getElementById('about-text').textContent = [
      'ShukGEN β€” Face Style Generator',
      '━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━',
      '',
      'MODEL ARCHITECTURE: FaceVAE',
      `  Latent Dimension  : ${cfg.latent_dim ?? 'β€”'}`,
      `  Base Filters      : ${cfg.base_filters ?? 'β€”'}`,
      `  Image Size        : ${data.image_size ?? 'β€”'}`,
      `  Device            : ${data.device ?? 'β€”'}`,
      `  PyTorch           : ${data.torch_version ?? 'β€”'}`,
      '',
      'ENCODER',
      '  Inc β†’ DownBlockΓ—4 β†’ Bottleneck β†’ Pool β†’ fc_mu / fc_logvar',
      '  Bottleneck: ResBlock β†’ AttnBlock β†’ ResBlock β†’ SE',
      '',
      'DECODER',
      '  fc_dec β†’ Upsample β†’ UpBlockΓ—4 β†’ outc (Tanh)',
      '',
      'STYLE TRANSFORMS (8 built-in, pixel-space):',
      '  0: Youthful       β€” saturation boost + subtle smoothing',
      '  1: Aged / Mature  β€” desaturation + warm tint + grain + vignette',
      '  2: Dramatic Light β€” horizontal gradient + high contrast + vignette',
      '  3: Soft Glow      β€” blur additive blend + warm tint + lift',
      '  4: Intense / Bold β€” heavy saturation + contrast + sharpness',
      '  5: Warm Golden Hr β€” red/green boost + blue reduction',
      '  6: Cool / Moody   β€” red reduction + blue boost + grain + vignette',
      '  7: Sketch/Artisticβ€” posterize + edge detection + canvas grain',
      '',
      'LATENT WALK',
      '  Random direction sampled in latent space.',
      '  Walk range: βˆ’2.5Οƒ to +2.5Οƒ, styles blended by Ξ±.',
    ].join('\n');
  }).catch(() => {
    document.getElementById('about-text').textContent = 'Connect to server to see architecture details.';
  });
}

// ═══════════════════════════════════════════════════════════
//  HELPERS
// ═══════════════════════════════════════════════════════════
function setStatus(msg) {
  document.getElementById('status-text').textContent = msg;
}
function setGenStatus(msg) {
  document.getElementById('gen-status').textContent = msg;
}
function setProgress(pct) {
  document.getElementById('progress-fill').style.width = pct + '%';
}
function setImgOrPh(id, b64) {
  const el = document.getElementById(id);
  if (b64) {
    el.outerHTML = `<img id="${id}" src="${b64}" style="width:100%;aspect-ratio:1;object-fit:cover;cursor:zoom-in;" onclick="openLightboxSrc('${b64}')" />`;
  }
}

// ── Tab switching ──
function switchTab(name, btn) {
  document.querySelectorAll('.tab-content').forEach(t => t.classList.remove('active'));
  document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
  document.getElementById('tab-' + name).classList.add('active');
  btn.classList.add('active');
}

// ── Theme ──
let isDark = true;
function toggleTheme() {
  isDark = !isDark;
  document.body.classList.toggle('light', !isDark);
  document.getElementById('theme-btn').textContent = isDark ? 'β˜€ Light Mode' : 'πŸŒ™ Dark Mode';
}

// ═══════════════════════════════════════════════════════════
//  INIT
// ═══════════════════════════════════════════════════════════
function init() {
  buildGallery();
  buildCompareSelect();
  buildStrengthRadios();
  buildWalkSelects();

  // Auto-ping server
  pingServer();
}

document.addEventListener('DOMContentLoaded', init);
</script>
</body>
</html>