* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    background: #f5f5f5;
    font-family: 'Poppins', sans-serif;
    color: #333;
    transition: 0.3s;
  }
  
  .wrapper {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: 0.3s;
  }
  
  header {
    text-align: center;
    margin-bottom: 20px;
  }
  
  header h1 {
    font-size: 2.5em;
    margin-bottom: 5px;
    color: #3498db;
  }
  
  header p {
    font-size: 1.1em;
    color: #666;
  }
  
  /* Tabs */
  .tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
  }
  
  .tab-btn {
    background: #3498db;
    color: #fff;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    margin: 0 5px;
    border-radius: 5px;
    transition: 0.3s;
  }
  
  .tab-btn:hover, .tab-btn.active {
    background: #2980b9;
  }
  
  .tab-content {
    display: none;
    text-align: center;
  }
  
  .tab-content.active {
    display: block;
  }
  
  /* File Upload & Input */
  .custom-file {
    display: inline-block;
    background: #3498db;
    color: #fff;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    transition: 0.3s;
  }
  
  .custom-file:hover {
    background: #2980b9;
  }
  
  .custom-file input {
    display: none;
  }
  
  input, textarea {
    width: 80%;
    padding: 10px;
    margin-top: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
  }
  
  .btn-group {
    margin-top: 15px;
  }
  
  .btn-group button {
    padding: 10px 20px;
    border: none;
    background: #2ecc71;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
    margin: 5px;
    transition: 0.3s;
  }
  
  .btn-group button:hover {
    background: #27ae60;
  }
  
  /* Dark Mode */
  .dark-mode-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
  }
  
  .dark-mode-toggle input {
    display: none;
  }
  
  .dark-mode-toggle .slider {
    width: 40px;
    height: 20px;
    background: #ddd;
    border-radius: 15px;
    display: inline-block;
    position: relative;
    transition: 0.3s;
  }
  
  .dark-mode-toggle input:checked + .slider {
    background: #27ae60;
  }
  
  body.dark-mode {
    background: #333;
    color: white;
  }
  
  body.dark-mode .wrapper {
    background: #444;
    color: white;
  }
  
  body.dark-mode .tab-btn {
    background: #2ecc71;
  }
  
  footer {
    text-align: center;
    margin-top: 20px;
    color: #999;
    font-size: 0.9em;
  }