*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:#f5f5f5;min-height:100vh;padding:40px 20px}.app{max-width:500px;margin:0 auto;background:#fff;padding:30px;border-radius:10px;box-shadow:0 2px 10px #0000001a}h1{text-align:center;color:#333;margin-bottom:30px}.todo-form{display:flex;gap:10px;margin-bottom:20px}.todo-input{flex:1;padding:12px 15px;border:2px solid #e0e0e0;border-radius:8px;font-size:16px;outline:none;transition:border-color .2s}.todo-input:focus{border-color:#4a90d9}.add-button{padding:12px 24px;background-color:#4a90d9;color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;transition:background-color .2s}.add-button:hover{background-color:#357abd}.todo-list{list-style:none}.todo-item{display:flex;align-items:center;justify-content:space-between;padding:15px;border-bottom:1px solid #eee}.todo-item:last-child{border-bottom:none}.todo-text{flex:1;cursor:pointer;font-size:16px;color:#333}.todo-text.completed{text-decoration:line-through;color:#999}.delete-button{padding:8px 16px;background-color:#ff6b6b;color:#fff;border:none;border-radius:6px;font-size:14px;cursor:pointer;transition:background-color .2s}.delete-button:hover{background-color:#ee5a5a}