:root{color:#1a1a1a;background:#f7f7f8;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0}.container{max-width:560px;margin:3rem auto;padding:0 1rem}h1{font-size:1.5rem}.add-form{gap:.5rem;margin-bottom:1rem;display:flex}.add-form input{border:1px solid #d0d0d5;border-radius:6px;flex:1;padding:.5rem .75rem;font-size:1rem}.add-form button{color:#fff;cursor:pointer;background:#2563eb;border:none;border-radius:6px;padding:.5rem 1rem;font-size:1rem}.error{color:#b91c1c}.empty{color:#6b7280}.task-list{flex-direction:column;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}.task-list li{background:#fff;border:1px solid #e5e7eb;border-radius:6px;justify-content:space-between;align-items:center;padding:.5rem .75rem;display:flex}.task-list li.done span{color:#9ca3af;text-decoration:line-through}.task-list label{cursor:pointer;align-items:center;gap:.5rem;display:flex}.task-list li button{color:#ef4444;cursor:pointer;background:0 0;border:none;font-size:1rem}