diff --git a/core/src/lib.rs b/core/src/lib.rs
index 9712af1..53700bf 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -4,4 +4,6 @@ pub mod ai;
 pub mod board;
 pub mod rules;
 pub mod record;
+pub mod llm;
+pub mod network;
 pub mod types;
diff --git a/core/src/network.rs b/core/src/network.rs
new file mode 100644
index 0000000..efb0b74
--- /dev/null
+++ b/core/src/network.rs
@@ -0,0 +1,61 @@
+use serde::{Deserialize, Serialize};
+
+/// 游戏网络消息
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum GameMessage {
+    Move { x: usize, y: usize, turn: u32 },
+    Undo { steps: u32 },
+    Resign,
+    Chat(String),
+    Heartbeat,
+}
+
+/// 网络连接角色
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum NetworkRole {
+    Server,
+    Client,
+}
+
+/// 网络会话配置
+#[derive(Debug, Clone)]
+pub struct NetworkConfig {
+    pub role: NetworkRole,
+    pub bind_port: u16,
+    pub remote_addr: String,
+    pub remote_port: u16,
+}
+
+/// 网络会话状态
+#[derive(Debug, Clone)]
+pub struct NetworkSession {
+    pub role: NetworkRole,
+    pub is_connected: bool,
+    pub config: NetworkConfig,
+    pending_messages: Vec<GameMessage>,
+}
+
+impl NetworkSession {
+    pub fn new(config: NetworkConfig) -> Self {
+        Self {
+            role: config.role,
+            is_connected: false,
+            config,
+            pending_messages: Vec::new(),
+        }
+    }
+
+    /// 发送消息 (实际 renet 集成在 gui 层处理)
+    pub fn enqueue_message(&mut self, msg: GameMessage) {
+        self.pending_messages.push(msg);
+    }
+
+    /// 取出待发送的消息
+    pub fn drain_messages(&mut self) -> Vec<GameMessage> {
+        std::mem::take(&mut self.pending_messages)
+    }
+
+    pub fn set_connected(&mut self, connected: bool) {
+        self.is_connected = connected;
+    }
+}