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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>Giftopia Theme Switcher</title>
+  <!--
+   Here is the CSS styling for our theme "Optimistic Calm".
+   {
+     --bg: #FFFFFF,
+     --text: #000000,
+     --primary: #458600,
+     --accent: #ABFF00,
+     --highlight: #70F3EF
+   }
+  -->
+  <style>
+    :root {
+      --bg: #ffffff;
+      --text: #000000;
+      --primary: #dddddd;
+      --accent: #cccccc;
+      --highlight: #aaaaaa;
+    }
+
+    body {
+      margin: 0;
+      padding: 2rem;
+      background-color: var(--bg);
+      color: var(--text);
+      font-family: system-ui, sans-serif;
+      transition: all 0.3s ease;
+    }
+
+    h2, h3 {
+      margin-top: 1.5rem;
+    }
+
+    .theme-buttons {
+      margin: 1rem 0;
+    }
+
+    button {
+      margin: 0.3rem;
+      padding: 0.5rem 1rem;
+      border: none;
+      border-radius: 4px;
+      cursor: pointer;
+      background: #eee;
+      transition: background 0.2s;
+    }
+
+    button:hover {
+      background: #ddd;
+    }
+
+    .swatch-bar {
+      display: flex;
+      height: 40px;
+      margin-bottom: 1.5rem;
+      border-radius: 6px;
+      overflow: hidden;
+      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
+    }
+
+    .swatch {
+      flex: 1;
+    }
+
+    .card {
+      background: var(--primary);
+      padding: 1rem;
+      border-radius: 8px;
+      margin-bottom: 1rem;
+    }
+
+    .highlight {
+      background: var(--highlight);
+      padding: 0.5rem;
+      border-radius: 4px;
+      display: inline-block;
+    }
+
+    .accent {
+      color: var(--accent);
+    }
+
+    .color-vars {
+      display: grid;
+      grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
+      gap: 1rem;
+      margin-top: 1rem;
+    }
+
+    .color-tile {
+      border: 1px solid #ccc;
+      border-radius: 6px;
+      padding: 0.5rem;
+      display: flex;
+      flex-direction: column;
+      justify-content: space-between;
+      font-size: 0.9rem;
+      background-color: #fff;
+    }
+
+    .tile-preview {
+      height: 40px;
+      border-radius: 4px;
+      margin-bottom: 0.3rem;
+    }
+  </style>
+</head>
+<body>
+  <h2>🎨 Giftopia Theme Preview</h2>
+
+  <!-- Theme Switch Buttons -->
+  <div class="theme-buttons">
+      <button onclick="setTheme('op-calm')">🌼🧠 Optimistic Calm</button>
+
+      <!--
+      <button onclick="setTheme('pastel')">🌸 Warm Pastels</button>
+      <button onclick="setTheme('earth')">🌼 Optimistic Earth</button>
+      <button onclick="setTheme('bright')">✨ Bright Uplift</button>
+      <button onclick="setTheme('calm')">🧠 Productive Calm</button>
+      <button onclick="setTheme('garden')">🪴 Giving Garden</button>
+      <button onclick="setTheme('op-garden')">🌼🪴 Optimistic Garden</button>
+      -->
+  </div>
+
+  <!-- Visual Designer Swatch Bar -->
+  <div class="swatch-bar">
+    <div class="swatch" id="swatch-bg"></div>
+    <div class="swatch" id="swatch-text"></div>
+    <div class="swatch" id="swatch-primary"></div>
+    <div class="swatch" id="swatch-accent"></div>
+    <div class="swatch" id="swatch-highlight"></div>
+  </div>
+
+  <!-- UI Preview Card -->
+  <div class="card">
+    <h3>Sample Card</h3>
+    <p>This card reflects the current theme's <code>--primary</code> background color.</p>
+    <p class="highlight">This is a <code>--highlight</code> element.</p>
+    <p class="accent">This line uses the <code>--accent</code> color.</p>
+  </div>
+
+  <!-- Variable Overview -->
+  <h3>Current Theme Colors</h3>
+  <div class="color-vars" id="colorVars">
+    <!-- Filled by JavaScript -->
+  </div>
+
+  <script>
+   const themes = {
+       "op-calm": {
+           '--bg': '#FFFFFF',
+           '--text': '#000000',
+           '--primary': '#458600',
+           '--accent': '#ABFF00',
+           '--highlight': '#70F3EF'
+       },
+       pastel: {
+           '--bg': '#fffafc',
+           '--text': '#444',
+           '--primary': '#CDE9F9',
+           '--accent': '#F7D6E0',
+           '--highlight': '#FBD38D'
+       },
+       earth: {
+           '--bg': '#FAF3E0',
+           '--text': '#3A3A3A',
+           '--primary': '#FFCC70',
+           '--accent': '#E2725B',
+           '--highlight': '#7F9F80'
+       },
+       bright: {
+           '--bg': '#FFF9F2',
+           '--text': '#2D2D2D',
+           '--primary': '#FFF685',
+           '--accent': '#FFB09E',
+           '--highlight': '#A7F2C1'
+       },
+       calm: {
+           '--bg': '#FAFAFA',
+           '--text': '#3E4C59',
+           '--primary': '#D0F0EF',
+           '--accent': '#FFD8BE',
+           '--highlight': '#6699CC'
+       },
+       garden: {
+           '--bg': '#F7FFF7',
+           '--text': '#3C3C3C',
+           '--primary': '#A8D5BA',
+           '--accent': '#E0A899',
+           '--highlight': '#F9DC5C'
+       },
+       "op-garden": {
+           '--bg': '#F7FFF7',
+           '--text': '#3C3C3C',
+           '--primary': '#A8D5BA',
+           '--accent': '#E2725B',
+           '--highlight': '#F9DC5C'
+       },
+   };
+
+   function setTheme(themeName) {
+       const theme = themes[themeName];
+       for (let variable in theme) {
+           document.documentElement.style.setProperty(variable, theme[variable]);
+       }
+       localStorage.setItem('selectedTheme', themeName);
+       renderColorTiles(theme);
+       updateSwatchBar(theme);
+   }
+
+   function loadTheme() {
+       const savedTheme = localStorage.getItem('selectedTheme') || 'op-calm';
+       setTheme(savedTheme);
+   }
+
+   function renderColorTiles(theme) {
+       const container = document.getElementById('colorVars');
+       container.innerHTML = '';
+       for (let variable in theme) {
+           const tile = document.createElement('div');
+           tile.className = 'color-tile';
+           tile.innerHTML = `
+               <div class="tile-preview" style="background: ${theme[variable]}"></div>
+               <strong>${variable}</strong>
+               <code>${theme[variable]}</code>
+           `;
+           container.appendChild(tile);
+       }
+   }
+
+   function updateSwatchBar(theme) {
+       document.getElementById('swatch-bg').style.background = theme['--bg'];
+       document.getElementById('swatch-text').style.background = theme['--text'];
+       document.getElementById('swatch-primary').style.background = theme['--primary'];
+       document.getElementById('swatch-accent').style.background = theme['--accent'];
+       document.getElementById('swatch-highlight').style.background = theme['--highlight'];
+   }
+
+   window.onload = loadTheme;
+  </script>
+</body>
+</html>