mind-gym/offline.html at master · LessUp/mind-gym · 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" />
    <base href="./" />
    <title>Offline - Mind Gym</title>
    <link rel="icon" type="image/svg+xml" href="./assets/icon.svg" />
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family:
          -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell,
          sans-serif;
        background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 2rem;
        color: white;
      }

      .container {
        max-width: 500px;
        text-align: center;
      }

      .icon {
        font-size: 5rem;
        margin-bottom: 1rem;
        animation: pulse 2s infinite;
      }

      @keyframes pulse {
        0%,
        100% {
          opacity: 1;
        }
        50% {
          opacity: 0.7;
        }
      }

      h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
        font-weight: 700;
      }

      p {
        font-size: 1.125rem;
        line-height: 1.6;
        margin-bottom: 1.5rem;
        opacity: 0.9;
      }

      .tips {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 0.75rem;
        padding: 1.5rem;
        margin-top: 2rem;
        text-align: left;
      }

      .tips h2 {
        font-size: 1.25rem;
        margin-bottom: 0.75rem;
      }

      .tips ul {
        list-style: none;
        padding: 0;
      }

      .tips li {
        padding: 0.5rem 0;
        padding-left: 1.5rem;
        position: relative;
      }

      .tips li::before {
        content: '✓';
        position: absolute;
        left: 0;
        font-weight: bold;
      }

      .btn-group {
        display: flex;
        gap: 1rem;
        justify-content: center;
        flex-wrap: wrap;
        margin-top: 1rem;
      }

      .btn {
        background: white;
        color: #4f46e5;
        border: none;
        padding: 1rem 2rem;
        border-radius: 0.5rem;
        font-size: 1.125rem;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.2s;
        text-decoration: none;
        display: inline-block;
      }

      .btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
      }

      .btn:active {
        transform: translateY(0);
      }

      .btn-secondary {
        background: transparent;
        color: white;
        border: 2px solid white;
      }

      .status {
        margin-top: 2rem;
        padding: 1rem;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 0.5rem;
        font-size: 0.875rem;
        opacity: 0.8;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="icon">📡</div>
      <h1>You're Offline</h1>
      <p id="message">
        It looks like you've lost your internet connection. Don't worry - Mind Gym may still work if
        you've visited it before!
      </p>

      <div class="btn-group">
        <button class="btn" onclick="window.location.reload()">🔄 Try Again</button>
        <a href="./" class="btn btn-secondary">🏠 Go Home</a>
      </div>

      <div class="tips">
        <h2>Quick Tips:</h2>
        <ul>
          <li>Check your internet connection</li>
          <li>If you've played before, try reloading - the game might be cached</li>
          <li>Try disabling WiFi and using mobile data (or vice versa)</li>
          <li>Clear browser cache if the game isn't loading</li>
        </ul>
      </div>

      <div class="status" id="cache-status">Checking cache status...</div>
    </div>

    <script>
      // Auto-retry when connection is restored
      window.addEventListener('online', () => {
        window.location.reload();
      });

      // Check cache status
      if ('caches' in window) {
        caches
          .match('./index.html')
          .then(cached => {
            const statusEl = document.getElementById('cache-status');
            const messageEl = document.getElementById('message');

            if (cached) {
              statusEl.textContent = '✅ Cached version available';
              statusEl.style.background = 'rgba(34, 197, 94, 0.3)';
              messageEl.textContent =
                "You're offline, but a cached version of Mind Gym is available. You should be able to play!";
            } else {
              statusEl.textContent = '❌ No cached version found';
              statusEl.style.background = 'rgba(239, 68, 68, 0.3)';
            }
          })
          .catch(() => {
            document.getElementById('cache-status').textContent = '⚠️ Unable to check cache';
          });
      }
    </script>
  </body>
</html>