*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}.app{min-height:100vh}.header{background:#fff;border-bottom:1px solid #e5e5e5;padding:1rem 2rem}.header h1{margin-bottom:1rem;color:#333}.nav{display:flex;gap:1rem}.nav-button{padding:.5rem 1rem;border:1px solid #ddd;background:#fff;border-radius:4px;cursor:pointer;transition:all .2s}.nav-button:hover{background:#f0f0f0}.nav-button.active{background:#007bff;color:#fff;border-color:#007bff}.main{padding:2rem}.card{background:#fff;border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:0 2px 4px #0000001a}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:#333}.form-group input{width:100%;padding:.5rem;border:1px solid #ddd;border-radius:4px;font-size:1rem}.form-group input:focus{outline:none;border-color:#007bff;box-shadow:0 0 0 2px #007bff40}.btn{padding:.5rem 1rem;border:none;border-radius:4px;cursor:pointer;font-size:1rem;transition:background-color .2s}.btn-primary{background:#007bff;color:#fff}.btn-primary:hover{background:#0056b3}.btn-success{background:#28a745;color:#fff}.btn-success:hover{background:#1e7e34}.btn-danger{background:#dc3545;color:#fff}.btn-danger:hover{background:#c82333}.btn-secondary{background:#6c757d;color:#fff}.btn-secondary:hover{background:#545b62}.btn:disabled{opacity:.6;cursor:not-allowed}.player-card{border:1px solid #e5e5e5;border-radius:4px;padding:1rem;margin-bottom:1rem;background:#fafafa}.player-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:1rem;margin:1rem 0;font-size:.9rem}.player-actions{display:flex;gap:.5rem;margin-top:1rem}.error{background:#f8d7da;border:1px solid #f5c6cb;color:#721c24;padding:.75rem;border-radius:4px;margin-bottom:1rem}.success{background:#d4edda;border:1px solid #c3e6cb;color:#155724;padding:.75rem;border-radius:4px;margin-bottom:1rem}.loading{text-align:center;padding:2rem;color:#666}.merge-preview{background:#fff3cd;border:1px solid #ffeaa7;border-radius:4px;padding:1rem;margin:1rem 0}.merge-preview h4{margin-bottom:.5rem;color:#856404}.player-comparison{display:grid;grid-template-columns:1fr auto 1fr;gap:1rem;align-items:center}.arrow{font-size:1.5rem;color:#666}