* {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 body {
     font-family: 'Arial', sans-serif;
     background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     min-height: 100vh;
     padding: 20px;
 }

 .container {
     max-width: 800px;
     margin: 0 auto;
     background: white;
     border-radius: 15px;
     box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
     overflow: hidden;
 }

 .header {
     background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
     color: white;
     padding: 30px;
     text-align: center;
 }

 .header h1 {
     font-size: 2.5em;
     margin-bottom: 10px;
     font-weight: bold;
 }

 .header p {
     font-size: 1.1em;
     opacity: 0.9;
 }

 .form-container {
     padding: 40px;
 }

 .message {
     padding: 15px;
     border-radius: 8px;
     margin-bottom: 20px;
     font-weight: bold;
 }

 .message.success {
     background-color: #d4edda;
     color: #155724;
     border: 1px solid #c3e6cb;
 }

 .message.error {
     background-color: #f8d7da;
     color: #721c24;
     border: 1px solid #f5c6cb;
 }

 .form-group {
     margin-bottom: 25px;
 }

 .form-group label {
     display: block;
     margin-bottom: 8px;
     font-weight: bold;
     color: #333;
     font-size: 1.1em;
 }

 .form-group input[type="text"],
 .form-group input[type="email"],
 .form-group input[type="date"],
 .form-group select,
 .form-group textarea {
     width: 100%;
     padding: 12px 15px;
     border: 2px solid #e1e8ed;
     border-radius: 8px;
     font-size: 16px;
     transition: all 0.3s ease;
 }

 .form-group input:focus,
 .form-group textarea:focus {
     outline: none;
     border-color: #667eea;
     box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
 }

 .form-group textarea {
     resize: vertical;
     height: 100px;
 }

 .games-section {
     margin-bottom: 25px;
 }

 .games-section label {
     display: block;
     margin-bottom: 15px;
     font-weight: bold;
     color: #333;
     font-size: 1.1em;
 }

 .games-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
     gap: 15px;
 }

 .game-option {
     background: #f8f9fa;
     border: 2px solid #e9ecef;
     border-radius: 10px;
     padding: 15px;
     text-align: center;
     cursor: pointer;
     transition: all 0.3s ease;
     position: relative;
 }

 .game-option:hover {
     border-color: #667eea;
     background: #f0f4ff;
     transform: translateY(-2px);
 }

 .game-option input[type="checkbox"] {
     display: none;
 }

 .game-option input[type="checkbox"]:checked+.game-content {
     background: #667eea;
     color: white;
 }

 .game-option input[type="checkbox"]:checked+.game-content::after {
     content: "✓";
     position: absolute;
     top: 5px;
     right: 10px;
     font-size: 20px;
     font-weight: bold;
 }

 .game-content {
     font-weight: bold;
     font-size: 1.1em;
     border-radius: 8px;
     padding: 10px;
     transition: all 0.3s ease;
     position: relative;
 }

 .submit-btn {
     background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     color: white;
     padding: 15px 40px;
     border: none;
     border-radius: 50px;
     font-size: 18px;
     font-weight: bold;
     cursor: pointer;
     transition: all 0.3s ease;
     width: 100%;
     margin-top: 20px;
 }

 .submit-btn:hover {
     transform: translateY(-2px);
     box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
 }

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

 @media (max-width: 768px) {
     .container {
         margin: 10px;
     }

     .form-container {
         padding: 20px;
     }

     .header h1 {
         font-size: 2em;
     }

     .games-grid {
         grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
         gap: 10px;
     }

     .logout-btn {
         background: #ff6b6b;
         border: none;
         color: white;
         padding: 8px 16px;
         border-radius: 20px;
         font-weight: bold;
         cursor: pointer;
         transition: 0.3s;
     }

     .logout-btn:hover {
         background: #ee5253;
         transform: translateY(-2px);
     }
 }