:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#213547;background-color:#f4f6fb;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}}body{font-family:Arial,Helvetica,sans-serif;background:#f4f6fb;display:flex;justify-content:center;margin-top:60px}.todo-container{background:#fff;padding:30px;width:420px;border-radius:12px;box-shadow:0 8px 20px #00000014}input{padding:10px;width:70%;border-radius:6px;border:1px solid #ddd;font-size:14px}button{padding:8px 14px;border:none;border-radius:6px;cursor:pointer;background:#4f46e5;color:#fff;font-size:13px}button:hover{opacity:.9}ul{list-style:none;padding:0}li{display:flex;align-items:center;justify-content:space-between;background:#f9fafc;padding:10px 15px;border-radius:8px;margin-bottom:12px;gap:10px;transition:transform .15s ease,box-shadow .15s ease}li:hover{transform:translateY(-2px);box-shadow:0 4px 10px #00000014}.completed{text-decoration:line-through;color:gray}.todo-text{flex:1;word-break:break-word}.btn-group{display:flex;gap:6px}