:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}:root{--primary-color: #3b82f6;--secondary-color: #10b981;--danger-color: #ef4444;--text-color: #333333;--light-gray: #f3f4f6;--medium-gray: #e5e7eb;--dark-gray: #9ca3af}*{margin:0;padding:0;box-sizing:border-box;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}body{background-color:#f9fafb;color:var(--text-color);line-height:1.6;display:flex;justify-content:center;align-items:center;min-height:100vh}.App{max-width:800px;margin:0 auto;padding:2rem 1rem}.auth-container{max-width:400px;margin:2rem auto;padding:2rem;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000001a}.auth-container h1{text-align:center;margin-bottom:1.5rem;color:var(--primary-color)}.auth-form{display:flex;flex-direction:column;gap:1rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-weight:500;color:var(--text-color)}.form-group input{padding:.75rem;border:1px solid var(--medium-gray);border-radius:4px;font-size:1rem}.form-group input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}.button-group{display:flex;gap:1rem;margin-top:1rem}.sign-in-button,.sign-up-button{flex:1;padding:.75rem;border:none;border-radius:4px;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .2s}.sign-in-button{background-color:var(--primary-color);color:#fff}.sign-in-button:hover{background-color:#2563eb}.sign-up-button{background-color:var(--secondary-color);color:#fff}.sign-up-button:hover{background-color:#059669}.error-message{padding:.75rem;background-color:#ef44441a;color:var(--danger-color);border-radius:4px;margin-bottom:1rem}.success-message{padding:.75rem;background-color:#10b9811a;color:var(--secondary-color);border-radius:4px;margin-bottom:1rem}.todo-container{background-color:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000001a;padding:2rem}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--medium-gray)}.header h1{color:var(--primary-color)}.sign-out-button{padding:.5rem 1rem;background-color:var(--medium-gray);color:var(--text-color);border:none;border-radius:4px;cursor:pointer;transition:background-color .2s}.sign-out-button:hover{background-color:var(--dark-gray)}.add-task-form{display:flex;gap:.5rem;margin-bottom:2rem}.task-input{flex:1;padding:.75rem;border:1px solid var(--medium-gray);border-radius:4px;font-size:1rem}.task-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}.add-button{padding:.75rem 1.5rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;transition:background-color .2s}.add-button:hover{background-color:#2563eb}.tasks-list{display:flex;flex-direction:column;gap:.75rem}.task-item{display:flex;align-items:center;padding:1rem;background-color:var(--light-gray);border-radius:4px;transition:background-color .2s}.task-item:hover{background-color:#e9ecef}.task-item.completed{background-color:#10b9811a}.task-checkbox{width:1.25rem;height:1.25rem;margin-right:1rem;cursor:pointer}.task-content{flex:1;text-align:left}.task-item.completed .task-content{text-decoration:line-through;color:var(--dark-gray)}.delete-button{padding:.5rem;background-color:transparent;color:var(--danger-color);border:none;border-radius:4px;cursor:pointer;transition:background-color .2s}.delete-button:hover{background-color:#ef44441a}.empty-message{text-align:center;padding:2rem;color:var(--dark-gray);font-style:italic}.loading{text-align:center;padding:2rem;color:var(--dark-gray)}