: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}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}button{outline:none;border:none;border-color:transparent;outline-color:transparent}.app-container{background:#fff;padding:40px;border-radius:20px;box-shadow:0 10px 40px #0003;width:600px;max-width:100%}h1{text-align:center;color:#333;margin-bottom:30px;font-size:2rem}.add-task-form{display:flex;gap:10px;margin-bottom:30px}.task-input{flex:1;padding:12px 16px;border:2px solid #e0e0e0;border-radius:10px;font-size:16px;transition:border-color .3s}.task-input:focus{outline:none;border-color:#667eea}.add-btn{padding:12px 24px;background:#667eea;color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer;transition:background .3s;white-space:nowrap}.add-btn:hover{background:#5568d3}.task-list{list-style:none}.task-item{display:flex;justify-content:space-between;align-items:center;padding:16px;background:#f8f9fa;border-radius:10px;margin-bottom:12px;transition:transform .2s,box-shadow .2s;gap:16px}.task-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.task-content{display:flex;align-items:center;gap:12px;flex:1;min-width:0}.task-checkbox{width:20px;height:20px;cursor:pointer;flex-shrink:0}.task-title{font-size:16px;color:#333;word-break:break-word}.task-title.completed{text-decoration:line-through;color:#999}.edit-input{flex:1;padding:10px 14px;border:2px solid #667eea;border-radius:8px;font-size:16px;outline:none}.task-actions{display:flex;gap:8px;flex-shrink:0}.edit-btn{padding:10px 18px;background:#ffa502;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .3s;white-space:nowrap}.edit-btn:hover{background:#ff7f00}.delete-btn{padding:10px 18px;background:#ff4757;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .3s;white-space:nowrap}.delete-btn:hover{background:#ee5a6f}.save-btn{padding:10px 18px;background:#2ecc71;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .3s;white-space:nowrap}.save-btn:hover{background:#27ae60}.cancel-btn{padding:10px 18px;background:#95a5a6;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .3s;white-space:nowrap}.cancel-btn:hover{background:#7f8c8d}.empty-message{text-align:center;color:#999;font-size:18px;margin-top:40px}@media(max-width:768px){.app-container{padding:20px;width:100%}h1{font-size:1.5rem}.task-item{flex-direction:column;align-items:flex-start}.task-content{width:100%}.task-actions{width:100%;justify-content:flex-end}.edit-btn,.delete-btn,.save-btn,.cancel-btn{padding:8px 14px;font-size:13px}}