.auth-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.auth-form-container{background:#fff;padding:2rem;border-radius:8px;width:100%;max-width:400px;position:relative;box-shadow:0 4px 6px #0000001a}.auth-form-container h2{margin-top:0;margin-bottom:1.5rem;color:#333}.form-group input:focus{outline:none;border-color:#4caf50}.submit-button{width:100%;padding:.75rem;background:#4caf50;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer;margin-top:1rem}.toggle-text{margin-top:1rem;text-align:center;color:#666}.toggle-button{background:none;border:none;color:#4caf50;cursor:pointer;font-weight:500}.toggle-button:hover{text-decoration:underline}.start-number-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.start-number-form-container{background:#fff;padding:2rem;border-radius:8px;width:100%;max-width:400px;position:relative;box-shadow:0 4px 6px #0000001a}.start-number-form-container h2{margin-top:0;margin-bottom:1rem;color:#333}.description{color:#666;margin-bottom:1.5rem}.form-group input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:4px;font-size:1rem;box-sizing:border-box}.form-group input:focus{outline:none;border-color:#2196f3}.submit-button{width:100%;padding:.75rem;background:#2196f3;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer}.submit-button:hover:not(:disabled){background:#1976d2}.operation-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.operation-form-container{background:#fff;padding:2rem;border-radius:8px;width:100%;max-width:400px;position:relative;box-shadow:0 4px 6px #0000001a}.close-button{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#666}.close-button:hover{color:#000}.operation-form-container h2{margin-top:0;margin-bottom:1rem;color:#333}.current-value{background:#f5f5f5;padding:1rem;border-radius:4px;margin-bottom:1.5rem;font-size:1.1rem;text-align:center}.current-value strong{color:#4caf50;font-size:1.3rem}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;color:#555;font-weight:500}.operation-select,.form-group input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:4px;font-size:1rem;box-sizing:border-box}.operation-select:focus,.form-group input:focus{outline:none;border-color:#4caf50}.preview{background:#e8f5e9;padding:1rem;border-radius:4px;margin-bottom:1rem;font-size:1.1rem;text-align:center;color:#2e7d32;font-weight:500}.submit-button{width:100%;padding:.75rem;background:#4caf50;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer}.submit-button:hover:not(:disabled){background:#45a049}.submit-button:disabled{background:#ccc;cursor:not-allowed}.error-message{padding:.75rem;background:#ffebee;color:#c62828;border-radius:4px;margin-bottom:1rem}.calculation-node{margin:1rem 0}.calculation-content{background:#fff;border:2px solid #e0e0e0;border-radius:8px;padding:1rem;margin-bottom:.5rem;box-shadow:0 2px 4px #0000001a;transition:border-color .3s}.calculation-content:hover{border-color:#4caf50}.calculation-operation{display:flex;align-items:center;gap:.5rem;font-size:1.2rem;margin-bottom:.5rem}.operation-symbol{font-size:1.5rem;font-weight:700;color:#4caf50}.operation-number{font-weight:500}.calculation-start{display:flex;align-items:center;gap:.5rem;font-size:1.2rem;margin-bottom:.5rem}.start-label{color:#666}.start-number{font-weight:700;color:#2196f3;font-size:1.4rem}.calculation-result{font-size:1.3rem;color:#333;margin-bottom:.75rem}.calculation-result strong{color:#000;font-size:1.4rem}.calculation-meta{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:#666;margin-bottom:.5rem}.username{color:#4caf50;font-weight:500}.timestamp{color:#999}.add-operation-btn{background:#4caf50;color:#fff;border:none;padding:.5rem 1rem;border-radius:4px;cursor:pointer;font-size:.9rem;width:100%;margin-top:.5rem}.add-operation-btn:hover{background:#45a049}.calculation-children{margin-left:2rem;border-left:2px solid #e0e0e0;padding-left:1rem}*{box-sizing:border-box;margin:0;padding:0}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:#f5f5f5}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#fff;padding:1.5rem 2rem;box-shadow:0 2px 4px #0000001a;display:flex;justify-content:space-between;align-items:center}.app-header h1{color:#333;font-size:1.8rem}.header-actions{display:flex;align-items:center;gap:1rem}.username{color:#666;font-weight:500}.btn{padding:.75rem 1.5rem;border:none;border-radius:4px;cursor:pointer;font-size:1rem;font-weight:500;transition:background-color .3s}.btn-primary{background:#4caf50;color:#fff}.btn-primary:hover{background:#45a049}.btn-secondary{background:#f5f5f5;color:#333;border:1px solid #ddd}.btn-secondary:hover{background:#e0e0e0}.app-main{flex:1;padding:2rem;max-width:1200px;width:100%;margin:0 auto}.error-banner{background:#ffebee;color:#c62828;padding:1rem;border-radius:4px;margin-bottom:1rem}.loading{text-align:center;padding:3rem;color:#666;font-size:1.2rem}.empty-state{text-align:center;padding:3rem;background:#fff;border-radius:8px;box-shadow:0 2px 4px #0000001a}.empty-state h2{color:#333;margin-bottom:1rem}.empty-state p{color:#666;margin-bottom:1.5rem}.calculations-tree{background:#fff;padding:2rem;border-radius:8px;box-shadow:0 2px 4px #0000001a}@media (max-width: 768px){.app-header{flex-direction:column;gap:1rem;align-items:flex-start}.header-actions{width:100%;flex-wrap:wrap}.app-main{padding:1rem}}