:root{--primary-color:#0070f3;--secondary-color:#6c757d;--success-color:#28a745;--danger-color:#dc3545;--background-color:#f5f5f5;--text-color:#333;--border-radius:5px}*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;background-color:var(--background-color);color:var(--text-color)}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}button{background-color:var(--primary-color);border:none;color:white;padding:10px 20px;border-radius:var(--border-radius);cursor:pointer;font-size:1rem}button:hover{opacity:.9}button:disabled{background-color:var(--secondary-color);cursor:not-allowed}.container{max-width:1200px;margin:0 auto;padding:0 20px}.card{background-color:white;border-radius:var(--border-radius);padding:20px;box-shadow:0 2px 5px rgba(0,0,0,.1)}.card,.form-group{margin-bottom:20px}label{display:block;margin-bottom:5px;font-weight:500}input,select,textarea{width:100%;padding:10px;border:1px solid #ddd;border-radius:var(--border-radius);font-size:1rem}.error{color:var(--danger-color);margin-top:5px}.success{color:var(--success-color);margin-top:5px}.btn-danger{background-color:var(--danger-color)}.btn-success{background-color:var(--success-color)}.btn-secondary{background-color:var(--secondary-color)}.qr-code-container{text-align:center;margin:20px 0}.qr-code{max-width:250px;margin:0 auto}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:20px}