: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}}.todo-app{min-height:100vh;display:flex;justify-content:center;align-items:center;font-family:Arial,sans-serif;padding:20px}.todo-container{background:#fff;border-radius:15px;box-shadow:0 10px 30px #0003;padding:30px;width:100%;max-width:500px;min-height:400px}h1{text-align:center;color:#333;margin-bottom:30px;font-size:2.5rem;font-weight:300}.input-section{display:flex;gap:10px;margin-bottom:30px}.task-input{flex:1;padding:12px 15px;border:2px solid #e0e0e0;border-radius:8px;font-size:16px;outline:none;transition:border-color .3s ease}.task-input:focus{border-color:#667eea}.add-btn{padding:12px 20px;background:#667eea;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:16px;font-weight:600;transition:background-color .3s ease}.add-btn:hover{background:#5a6fd8}.task-list{min-height:200px}.no-tasks{text-align:center;color:#999;font-style:italic;margin-top:50px}.task-item{display:flex;align-items:center;justify-content:space-between;padding:15px;margin-bottom:10px;background:#f8f9fa;border-radius:8px;transition:all .3s ease}.task-item.completed{background:#e8f5e8;border-left-color:#28a745}.task-content{display:flex;align-items:center;gap:12px;flex:1}.task-checkbox{width:18px;height:18px;cursor:pointer}.task-text{font-size:16px;color:#333;transition:all .3s ease}.completed .task-text{text-decoration:line-through;color:#666}.delete-btn{padding:8px 15px;background:#dc3545;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:14px;transition:background-color .3s ease}.delete-btn:hover{background:#c82333}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}