body {
      margin: 0;
      font-family: "Segoe UI", sans-serif;
      background: #f8f9fa;
      color: #333;
      padding: 40px;
      position: relative;
      background-image: url('../images/vault1.jpg'); /* or full URL */
      background-size: cover;       /* scales image to fill screen */
      background-repeat: no-repeat; /* prevents tiling */
      background-position: center;  /* centers the image */
      background-attachment: fixed; /* optional: keeps it fixed when scrolling */
    }

    /* Gray overlay covering the full screen */
    .overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background-color: rgba(100, 100, 100, 0.4); /* adjust gray and transparency */
      z-index: 0;
    }

    .container {
      max-width: 900px;
      margin: auto;
      padding: 30px;
      background: #fff;
      border-radius: 12px;
      box-shadow: 0 0 20px rgba(0,0,0,0.05);
      position: relative;
      z-index: 1; /* Content sits above the overlay */
      padding: 20px;
      color: #000; /* adjust for contrast if needed */
    }

    h1, h2 {
      color: #4a4a9c;
    }

    input {
      padding: 8px;
      margin-top: 8px;
      width: 100%;
      box-sizing: border-box;
      font-size: 1rem;
    }
    button {
      margin-top: 10px;
      padding: 10px 16px;
      background-color: #4a4a9c;
      color: white;
      border: none;
      border-radius: 6px;
      cursor: pointer;
    }
    button:hover {
      background-color: #39397e;
    }
    .puzzle-image {
      width: 100%;
      max-height: 300px;
      object-fit: cover;        /* crop to fill the container */
      object-position: center;  /* show the center portion */
      display: block;           /* remove inline spacing */
      border-radius: 10px;
      margin: 10px 0 20px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    
    .hint {
      font-style: italic;
      margin-top: 5px;
      color: #666;
      display: none;
    }
    #timer {
      font-weight: bold;
      font-size: 1.2rem;
      margin-bottom: 20px;
      color: #d9534f;
    }

.styled-button {
  color: gray;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.3s ease;
}

.styled-button:hover {
  background-color: #e0e0e0;
}