diff --git a/hyprland-parser/src/lib.rs b/hyprland-parser/src/lib.rs
index 67d28b2..ad5f89b 100644
--- a/hyprland-parser/src/lib.rs
+++ b/hyprland-parser/src/lib.rs
@@ -1,10 +1,9 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 
 #[derive(Debug, Default)]
 pub struct HyprlandConfig {
     content: Vec<String>,
-    sections: HashMap<String, usize>,
-    added_entries: HashMap<String, HashSet<String>>,
+    sections: HashMap<String, (usize, usize)>,
 }
 
 impl HyprlandConfig {
@@ -13,55 +12,86 @@ impl HyprlandConfig {
     }
 
     pub fn parse(&mut self, config_str: &str) {
-        let mut current_section = String::new();
-        let mut section_start = 0;
+        let mut section_stack = Vec::new();
         for (i, line) in config_str.lines().enumerate() {
             let trimmed = line.trim();
             if trimmed.ends_with('{') {
-                current_section = trimmed.trim_end_matches('{').trim().to_string();
-                section_start = i;
-            } else if trimmed == "}" {
-                if !current_section.is_empty() {
-                    self.sections.insert(current_section.clone(), section_start);
-                    current_section.clear();
-                }
+                let section_name = trimmed.trim_end_matches('{').trim().to_string();
+                section_stack.push((section_name, i));
+            } else if trimmed == "}" && !section_stack.is_empty() {
+                let (name, start) = section_stack.pop().unwrap();
+                let full_name = section_stack
+                    .iter()
+                    .map(|(n, _)| n.as_str())
+                    .chain(std::iter::once(name.as_str()))
+                    .collect::<Vec<_>>()
+                    .join(".");
+                self.sections.insert(full_name, (start, i));
             }
             self.content.push(line.to_string());
         }
     }
 
     pub fn to_string(&self) -> String {
-        let mut result = self.content.join("\n");
-        for (category, entries) in &self.added_entries {
-            for entry in entries {
-                if !self.entry_exists(category, entry) {
-                    result.push_str(&format!("\n{}", entry));
-                }
-            }
-        }
-        result
-    }
-
-    fn entry_exists(&self, category: &str, entry: &str) -> bool {
-        self.content.iter().any(|line| line.trim() == entry)
+        self.content.join("\n")
     }
 
     pub fn add_entry(&mut self, category: &str, entry: &str) {
-        if !self.entry_exists(category, entry) {
-            if let Some(&section_start) = self.sections.get(category) {
-                let insert_position = self.content[section_start..]
-                    .iter()
-                    .position(|line| line.trim() == "}")
-                    .map(|pos| section_start + pos)
-                    .unwrap_or(self.content.len());
-                self.content
-                    .insert(insert_position, format!("    {}", entry));
-            } else {
-                self.added_entries
-                    .entry(category.to_string())
-                    .or_insert_with(HashSet::new)
-                    .insert(entry.to_string());
+        let parts: Vec<&str> = category.split('.').collect();
+        let mut current_section = String::new();
+        let mut depth = 0;
+
+        for (i, part) in parts.iter().enumerate() {
+            if i > 0 {
+                current_section.push('.');
             }
+            current_section.push_str(part);
+
+            if let Some(&(start, end)) = self.sections.get(&current_section) {
+                if i == parts.len() - 1 {
+                    let key = entry.split('=').next().unwrap().trim();
+                    let existing_line = self.content[start..=end]
+                        .iter()
+                        .position(|line| line.trim().starts_with(key))
+                        .map(|pos| start + pos);
+
+                    if let Some(line_num) = existing_line {
+                        self.content[line_num] = format!("{}{}", "    ".repeat(depth + 1), entry);
+                    } else {
+                        self.content
+                            .insert(end, format!("{}{}", "    ".repeat(depth + 1), entry));
+                    }
+                    return;
+                }
+            } else {
+                let new_section = format!("{}{} {{", "    ".repeat(depth), part);
+                let insert_pos = if let Some(&(_, end)) = self.sections.get(&parts[..i].join(".")) {
+                    end + 1
+                } else {
+                    self.content.len()
+                };
+                self.content.insert(insert_pos, new_section);
+                self.content.insert(
+                    insert_pos + 1,
+                    format!("{}{}", "    ".repeat(depth + 1), entry),
+                );
+                self.content
+                    .insert(insert_pos + 2, format!("{}}}", "    ".repeat(depth)));
+
+                for (section, &mut (ref mut start, ref mut end)) in self.sections.iter_mut() {
+                    if *start >= insert_pos {
+                        *start += 3;
+                        *end += 3;
+                    } else if *end >= insert_pos {
+                        *end += 3;
+                    }
+                }
+                self.sections
+                    .insert(current_section.clone(), (insert_pos, insert_pos + 2));
+                return;
+            }
+
+            depth += 1;
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 6be0eb8..6ebf9b4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,10 +10,9 @@ fn main() {
 
     let mut parsed_config = parse_config(&config_str);
 
-    parsed_config.add_entry("general", "new_option = value");
     parsed_config.add_entry("decoration", "rounding = 10");
-    parsed_config.add_entry("decoration", "blur" "enabled = true");
-    parsed_config.add_entry("decoration", "blur" "size = 10");
+    parsed_config.add_entry("decoration.blur", "enabled = true");
+    parsed_config.add_entry("decoration.blur", "size = 10");
 
     let updated_config_str = parsed_config.to_string();