:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-secondary: #64748b;--color-success: #10b981;--color-danger: #ef4444;--color-warning: #f59e0b;--color-bg: #ffffff;--color-bg-secondary: #f8fafc;--color-bg-hover: #f1f5f9;--color-border: #e2e8f0;--color-text: #1e293b;--color-text-secondary: #64748b;--color-completed: #10b981;--color-completed-bg: #d1fae5;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--transition-fast: .15s ease-in-out;--transition-normal: .25s ease-in-out}*{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-color:var(--color-bg-secondary);color:var(--color-text);line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.container{max-width:900px;margin:0 auto;padding:0 var(--spacing-md);width:100%}.app-header{background-color:var(--color-bg);border-bottom:1px solid var(--color-border);padding:var(--spacing-md) 0;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm)}.header-content{max-width:900px;margin:0 auto;padding:0 var(--spacing-md);display:flex;justify-content:space-between;align-items:center}.app-title{font-size:1.75rem;font-weight:700;color:var(--color-primary);margin:0}.header-actions{display:flex;align-items:center;gap:var(--spacing-md)}.connection-status{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);font-size:.875rem;font-weight:500}.connection-status.connected{background-color:#d1fae5;color:#065f46}.connection-status.disconnected{background-color:#fee2e2;color:#991b1b}.status-indicator{width:8px;height:8px;border-radius:50%;background-color:currentColor;animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.app-main{flex:1;padding:var(--spacing-xl) 0}.error-banner{background-color:#fee2e2;border:1px solid #fecaca;border-radius:var(--radius-md);padding:var(--spacing-md);margin-bottom:var(--spacing-lg);display:flex;align-items:center;gap:var(--spacing-md)}.error-icon{font-size:1.5rem}.error-message{flex:1;color:#991b1b;font-weight:500}.create-task-section{margin-bottom:var(--spacing-xl)}.btn-create-task{width:100%;padding:var(--spacing-md);background-color:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:background-color var(--transition-fast);box-shadow:var(--shadow-sm)}.btn-create-task:hover{background-color:var(--color-primary-hover);box-shadow:var(--shadow-md)}.create-task-form{background-color:var(--color-bg);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md)}.create-task-form h2{margin-bottom:var(--spacing-md);color:var(--color-text)}.task-form{display:flex;flex-direction:column;gap:var(--spacing-md)}.form-group{display:flex;flex-direction:column}.form-input,.form-textarea{padding:var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus,.form-textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb1a}.form-textarea{resize:vertical;min-height:80px}.form-actions{display:flex;gap:var(--spacing-sm)}.btn-primary,.btn-secondary,.btn-icon,.btn-reconnect,.btn-retry{padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--radius-md);font-size:.875rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--color-primary-hover);box-shadow:var(--shadow-sm)}.btn-primary:disabled{background-color:var(--color-secondary);cursor:not-allowed;opacity:.6}.btn-secondary{background-color:var(--color-bg-secondary);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background-color:var(--color-bg-hover)}.btn-icon{background:transparent;font-size:1.25rem;padding:var(--spacing-sm)}.btn-icon:hover{background-color:var(--color-bg-hover)}.btn-reconnect,.btn-retry{background-color:var(--color-warning);color:#fff}.btn-reconnect:hover,.btn-retry:hover{opacity:.9}.task-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.empty-state{text-align:center;padding:var(--spacing-xl) var(--spacing-md);background-color:var(--color-bg);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.empty-state-icon{font-size:4rem;margin-bottom:var(--spacing-md)}.empty-state h2{color:var(--color-text);margin-bottom:var(--spacing-sm)}.empty-state p{color:var(--color-text-secondary)}.task-item{background-color:var(--color-bg);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition-fast);margin-bottom:var(--spacing-sm)}.task-item:hover{box-shadow:var(--shadow-md)}.task-content{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md)}.task-content.task-completed{opacity:.7}.task-content.task-completed .task-title{text-decoration:line-through;color:var(--color-text-secondary)}.task-checkbox{width:20px;height:20px;margin-top:4px;cursor:pointer;accent-color:var(--color-success)}.task-details{flex:1;cursor:pointer;min-width:0}.task-title{font-size:1.125rem;font-weight:600;color:var(--color-text);margin-bottom:var(--spacing-xs);word-wrap:break-word}.task-description{color:var(--color-text-secondary);margin-bottom:var(--spacing-sm);white-space:pre-wrap;word-wrap:break-word}.task-meta{display:flex;flex-wrap:wrap;gap:var(--spacing-md);font-size:.75rem;color:var(--color-text-secondary)}.task-completed-badge{background-color:var(--color-completed-bg);color:#065f46;padding:2px var(--spacing-sm);border-radius:var(--radius-sm);font-weight:500}.task-actions{display:flex;gap:var(--spacing-xs);align-items:flex-start}.btn-add-subtask,.btn-edit,.btn-delete,.btn-toggle-subtasks{background:transparent;border:none;font-size:1.25rem;cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:background-color var(--transition-fast)}.btn-add-subtask:hover,.btn-edit:hover,.btn-toggle-subtasks:hover{background-color:var(--color-bg-hover)}.btn-delete:hover{background-color:#fee2e2}.delete-confirm{display:flex;align-items:center;gap:var(--spacing-sm);background-color:#fee2e2;padding:var(--spacing-sm);border-radius:var(--radius-md)}.delete-confirm-text{font-size:.875rem;color:#991b1b;font-weight:500}.btn-confirm-delete,.btn-cancel-delete{padding:4px var(--spacing-sm);border:none;border-radius:var(--radius-sm);font-size:.75rem;font-weight:600;cursor:pointer}.btn-confirm-delete{background-color:var(--color-danger);color:#fff}.btn-cancel-delete{background-color:var(--color-bg-secondary);color:var(--color-text)}.subtask-form-container{margin:var(--spacing-md) 0 0 44px;padding:var(--spacing-md);background-color:var(--color-bg-secondary);border-radius:var(--radius-md)}.subtasks-container{margin-top:var(--spacing-sm)}.task-edit-form{flex:1}.app-footer{background-color:var(--color-bg);border-top:1px solid var(--color-border);padding:var(--spacing-md) 0;text-align:center;color:var(--color-text-secondary);font-size:.875rem}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;color:var(--color-text-secondary)}.loading-spinner{width:48px;height:48px;border:4px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:var(--spacing-md)}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.app-title{font-size:1.5rem}.header-content{flex-direction:column;gap:var(--spacing-md);align-items:flex-start}.task-content{flex-direction:column}.task-actions{width:100%;justify-content:flex-end}.subtask-form-container{margin-left:var(--spacing-md)}}.task-item.optimistic{opacity:.7;position:relative}.task-item.optimistic:after{content:"⏳";position:absolute;top:var(--spacing-md);right:var(--spacing-md);font-size:1rem;animation:fadeInOut 1.5s ease-in-out infinite}@keyframes fadeInOut{0%,to{opacity:.3}50%{opacity:1}}html{font-size:16px}body{margin:0;padding:0}#root{min-height:100vh}