:root{font-family:Inter,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}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;justify-content:center}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}button{background-color:#f9f9f9}}.app-container{width:100%;max-width:500px;padding:2rem;text-align:center}.todo-input-group{display:flex;gap:10px;margin-bottom:2rem}.todo-input{flex:1;padding:10px;border-radius:8px;border:1px solid #ccc;font-size:1rem}.todo-list{list-style:none;padding:0;text-align:left}.todo-item{display:flex;justify-content:space-between;align-items:center;padding:10px;background:#f9f9f9;border-radius:8px;margin-bottom:10px;box-shadow:0 2px 4px #0000001a}.dark .todo-item{background:#333}.todo-text{flex:1;cursor:pointer;margin-left:10px}.completed{text-decoration:line-through;opacity:.6}.delete-btn{background:transparent;color:#f44;padding:5px}.delete-btn:hover{border-color:#f44;background:#ff44441a}