/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  /* Page Layout */
  body {
    height: 100vh;
    background: rgb(3, 3, 3);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
  }
  
  /* Center Content */
  .container {
    text-align: center;
    z-index: 2;
  }
  
  /* PTI Header */
  .logo {
    font-size: 80px;
    font-weight: bold;
    color: #ffffff;
    margin-bottom: 80px;
  }
  
  /* Button */
  .btn {
    background-color: #e20909;
    color: rgb(0, 0, 0);
    font-size: 24px;
    padding: 18px 60px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0px 6px 15px rgba(0, 0, 0, 0.2);
    transition: 0.3s ease;
  }
  
  /* Button Hover */
  .btn:hover {
    background-color: #ff0000;
    transform: scale(1.05);
  }
  
  /* Wave Background */
  .wave {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 250px;
    background: linear-gradient(to right, #dbeeff, #f3f9ff);
    border-radius: 100% 100% 0 0;
    z-index: 1;
  }
  
/* Fullscreen rotating background */
.bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    z-index: 0;
  }
  
  /* Active background layer */
  .bg.visible {
    opacity: 1;
  }
  
  /* Dark overlay for readability */
  .overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.55);
    z-index: 1;
  }
  
  /* Keep content above background */
  .container {
    position: relative;
    z-index: 2;
  }