berlin-clock/index.html at master · nangui/berlin-clock · 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" />

    <!-- SEO Meta Tags -->
    <title>Berlin Clock Gamified - Interactive Learning Experience</title>
    <meta name="description" content="Master the Berlin Clock (Mengenlehreuhr) with our innovative, gamified learning experience. Features stunning 3D animations, multiple game modes, and adaptive difficulty levels." />
    <meta name="keywords" content="Berlin Clock, Mengenlehreuhr, time learning, educational game, clock reading, interactive learning" />
    <meta name="author" content="Berlin Clock Gamified" />

    <!-- Open Graph Meta Tags -->
    <meta property="og:title" content="Berlin Clock Gamified - Interactive Learning Experience" />
    <meta property="og:description" content="Master the Berlin Clock with our innovative, gamified learning experience featuring stunning 3D animations and multiple game modes." />
    <meta property="og:type" content="website" />
    <meta property="og:url" content="https://berlinclock.game" />
    <meta property="og:image" content="/og-image.png" />

    <!-- Twitter Card Meta Tags -->
    <meta name="twitter:card" content="summary_large_image" />
    <meta name="twitter:title" content="Berlin Clock Gamified" />
    <meta name="twitter:description" content="Interactive Berlin Clock learning experience with games and 3D animations." />
    <meta name="twitter:image" content="/twitter-card.png" />

    <!-- PWA Meta Tags -->
    <meta name="theme-color" content="#1a1a2e" />
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
    <meta name="apple-mobile-web-app-title" content="Berlin Clock" />

    <!-- Icons -->
    <link rel="icon" type="image/svg+xml" href="/icon.svg" />
    <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
    <link rel="mask-icon" href="/masked-icon.svg" color="#1a1a2e" />

    <!-- PWA Manifest -->
    <link rel="manifest" href="/manifest.json" />

    <!-- Preconnect to improve performance -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>

    <!-- Critical CSS would be inlined here in production -->
    <style>
      /* Critical loading styles */
      body {
        margin: 0;
        padding: 0;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
        background: linear-gradient(135deg, #1a1a2e, #16213e, #0f0f1a);
        color: white;
        overflow-x: hidden;
      }

      #root {
        min-height: 100vh;
      }

      /* Loading spinner */
      .loading-spinner {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 60px;
        height: 60px;
        border: 3px solid rgba(255, 255, 255, 0.1);
        border-top: 3px solid #6366f1;
        border-radius: 50%;
        animation: spin 1s linear infinite;
        z-index: 9999;
      }

      @keyframes spin {
        0% { transform: translate(-50%, -50%) rotate(0deg); }
        100% { transform: translate(-50%, -50%) rotate(360deg); }
      }

      /* Hide loading spinner when app loads */
      #root:not(:empty) + .loading-spinner {
        display: none;
      }
    </style>
  </head>
  <body>
    <div id="root"></div>
    <div class="loading-spinner"></div>
    <script type="module" src="/src/main.tsx"></script>

    <!-- Service Worker Registration -->
    <script>
      if ('serviceWorker' in navigator) {
        navigator.serviceWorker.register('/sw.js');
      }
    </script>
  </body>
</html>