diff --git a/Cargo.lock b/Cargo.lock
index b82b302..0c97647 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,17 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
+dependencies = [
+ "getrandom 0.2.17",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "allocator-api2"
 version = "0.2.21"
@@ -107,7 +118,7 @@ dependencies = [
  "serde",
  "serde_derive",
  "unicode-ident",
- "winnow 1.0.1",
+ "winnow",
 ]
 
 [[package]]
@@ -225,7 +236,7 @@ dependencies = [
  "aes-gcm",
  "async-trait",
  "axum",
- "base64",
+ "base64 0.22.1",
  "bytes",
  "chrono",
  "cookie",
@@ -259,6 +270,12 @@ dependencies = [
  "sqlx",
 ]
 
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -280,6 +297,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bitflags"
 version = "2.11.0"
@@ -409,6 +432,25 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "config"
+version = "0.13.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23738e11972c7643e4ec947840fc463b6a571afcd3e735bdfce7d03c7a784aca"
+dependencies = [
+ "async-trait",
+ "json5",
+ "lazy_static",
+ "nom",
+ "pathdiff",
+ "ron",
+ "rust-ini",
+ "serde",
+ "serde_json",
+ "toml",
+ "yaml-rust",
+]
+
 [[package]]
 name = "const-oid"
 version = "0.9.6"
@@ -422,7 +464,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ddef33a339a91ea89fb53151bd0a4689cfce27055c291dfa69945475d22c747"
 dependencies = [
  "aes-gcm",
- "base64",
+ "base64 0.22.1",
  "percent-encoding",
  "rand 0.8.5",
  "subtle",
@@ -581,6 +623,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dlv-list"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0688c2a7f92e427f44895cd63841bff7b29f8d7a1648b9e7e07a4a365b2e1257"
+
 [[package]]
 name = "dotenvy"
 version = "0.15.7"
@@ -882,6 +930,15 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
@@ -1049,7 +1106,7 @@ version = "0.1.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96547c2556ec9d12fb1578c4eaf448b04993e7fb79cbaad930a656880a6bdfa0"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "futures-channel",
  "futures-util",
@@ -1310,6 +1367,17 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "json5"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96b0db21af676c1ce64250b5f40f3ce2cf27e4e47cb91ed91eb6fe9350b430c1"
+dependencies = [
+ "pest",
+ "pest_derive",
+ "serde",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -1343,7 +1411,7 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e02f3bb43d335493c96bf3fd3a321600bf6bd07ed34bc64118e9293bdffea46c"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
  "libc",
  "plain",
  "redox_syscall 0.7.4",
@@ -1360,6 +1428,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
+
 [[package]]
 name = "litemap"
 version = "0.8.2"
@@ -1425,6 +1499,12 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "mio"
 version = "1.2.0"
@@ -1436,6 +1516,16 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "nonempty"
 version = "0.7.0"
@@ -1500,7 +1590,7 @@ version = "5.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51e219e79014df21a225b1860a479e2dcd7cbd9130f4defd4bd0e191ea31d67d"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "chrono",
  "getrandom 0.2.17",
  "http",
@@ -1532,6 +1622,16 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c87def4c32ab89d880effc9e097653c8da5d6ef28e6b539d313baaacfbafcbe"
 
+[[package]]
+name = "ordered-multimap"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccd746e37177e1711c20dd619a1620f34f5c8b569c53590a72dedd5344d8924a"
+dependencies = [
+ "dlv-list",
+ "hashbrown 0.12.3",
+]
+
 [[package]]
 name = "parking"
 version = "2.2.1"
@@ -1561,6 +1661,12 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "pathdiff"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
+
 [[package]]
 name = "pem-rfc7468"
 version = "0.7.0"
@@ -1576,6 +1682,49 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
+[[package]]
+name = "pest"
+version = "2.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0848c601009d37dfa3430c4666e147e49cdcf1b92ecd3e63657d8a5f19da662"
+dependencies = [
+ "memchr",
+ "ucd-trie",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11f486f1ea21e6c10ed15d5a7c77165d0ee443402f0780849d1768e7d9d6fe77"
+dependencies = [
+ "pest",
+ "pest_generator",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8040c4647b13b210a963c1ed407c1ff4fdfa01c31d6d2a098218702e6664f94f"
+dependencies = [
+ "pest",
+ "pest_meta",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89815c69d36021a140146f26659a81d6c2afa33d216d736dd4be5381a7362220"
+dependencies = [
+ "pest",
+ "sha2",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.17"
@@ -1829,7 +1978,7 @@ version = "0.5.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed2bf2547551a7053d6fdfafda3f938979645c44812fbfcda098faae3f1a362d"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
 ]
 
 [[package]]
@@ -1838,7 +1987,7 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f450ad9c3b1da563fb6948a8e0fb0fb9269711c9c73d9ea1de5058c79c8d643a"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
 ]
 
 [[package]]
@@ -1847,7 +1996,7 @@ version = "0.12.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "futures-core",
  "http",
@@ -1885,7 +2034,7 @@ version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab3f43e3283ab1488b624b44b0e988d0acea0b3214e694730a055cb6b2efa801"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -1933,6 +2082,17 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "ron"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88073939a61e5b7680558e6be56b419e208420c2adb92be54921fa6b72283f1a"
+dependencies = [
+ "base64 0.13.1",
+ "bitflags 1.3.2",
+ "serde",
+]
+
 [[package]]
 name = "rsa"
 version = "0.9.10"
@@ -1953,6 +2113,16 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "rust-ini"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6d5f2436026b4f6e79dc829837d467cc7e9a55ee40e750d716713540715a2df"
+dependencies = [
+ "cfg-if",
+ "ordered-multimap",
+]
+
 [[package]]
 name = "rustc-hash"
 version = "2.1.2"
@@ -2077,7 +2247,7 @@ version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7f4bc775c73d9a02cde8bf7b2ec4c9d12743edf609006c7facc23998404cd1d"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
  "core-foundation 0.10.1",
  "core-foundation-sys",
  "libc",
@@ -2154,15 +2324,6 @@ dependencies = [
  "serde_core",
 ]
 
-[[package]]
-name = "serde_spanned"
-version = "0.6.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf41e0cfaf7226dca15e8197172c295a782857fcb97fad1808a166870dee75a3"
-dependencies = [
- "serde",
-]
-
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.1"
@@ -2286,7 +2447,7 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee6798b1838b6a0f69c007c133b8df5866302197e404e8b6ee8ed3e3a5e68dc6"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "chrono",
  "crc",
@@ -2363,8 +2524,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa003f0038df784eb8fecbbac13affe3da23b45194bd57dba231c8f48199c526"
 dependencies = [
  "atoi",
- "base64",
- "bitflags",
+ "base64 0.22.1",
+ "bitflags 2.11.0",
  "byteorder",
  "bytes",
  "chrono",
@@ -2407,8 +2568,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "db58fcd5a53cf07c184b154801ff91347e4c30d17a3562a635ff028ad5deda46"
 dependencies = [
  "atoi",
- "base64",
- "bitflags",
+ "base64 0.22.1",
+ "bitflags 2.11.0",
  "byteorder",
  "chrono",
  "crc",
@@ -2525,7 +2686,7 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a13f3d0daba03132c0aa9767f98351b3488edc2c100cda2d2ec2b04f3d8d3c8b"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
  "core-foundation 0.9.4",
  "system-configuration-sys",
 ]
@@ -2700,45 +2861,13 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.8.23"
+version = "0.5.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
-dependencies = [
- "serde",
- "serde_spanned",
- "toml_datetime",
- "toml_edit",
-]
-
-[[package]]
-name = "toml_datetime"
-version = "0.6.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
 dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "toml_edit"
-version = "0.22.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
-dependencies = [
- "indexmap",
- "serde",
- "serde_spanned",
- "toml_datetime",
- "toml_write",
- "winnow 0.7.15",
-]
-
-[[package]]
-name = "toml_write"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
-
 [[package]]
 name = "tower"
 version = "0.5.3"
@@ -2761,7 +2890,7 @@ version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
  "bytes",
  "futures-core",
  "futures-util",
@@ -2839,6 +2968,12 @@ version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
 
+[[package]]
+name = "ucd-trie"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971"
+
 [[package]]
 name = "unicase"
 version = "2.9.0"
@@ -3069,7 +3204,7 @@ version = "0.244.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.0",
  "hashbrown 0.15.5",
  "indexmap",
  "semver",
@@ -3131,13 +3266,13 @@ dependencies = [
  "axum",
  "axum_session",
  "axum_session_sqlx",
+ "config",
  "oauth2",
  "reqwest 0.13.2",
  "serde",
  "sqlx",
  "thiserror 2.0.18",
  "tokio",
- "toml",
  "tower-http",
 ]
 
@@ -3518,15 +3653,6 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
 
-[[package]]
-name = "winnow"
-version = "0.7.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df79d97927682d2fd8adb29682d1140b343be4ac0f08fd68b7765d9c059d3945"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "winnow"
 version = "1.0.1"
@@ -3594,7 +3720,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
 dependencies = [
  "anyhow",
- "bitflags",
+ "bitflags 2.11.0",
  "indexmap",
  "log",
  "serde",
@@ -3630,6 +3756,15 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
 
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
+
 [[package]]
 name = "yoke"
 version = "0.8.2"
diff --git a/Cargo.toml b/Cargo.toml
index 41728e9..2be745b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,5 +16,5 @@ tokio = { version = "1.0", features = ["full"] }
 thiserror = "2.0"
 anyhow = "1.0"
 serde = { version = "1.0", features = ["derive"] }
-toml = "0.8"
+config = { version = "0.13", features = ["toml"] }
 tower-http = { version = "0.6", features = ["fs", "cors"] }
diff --git a/src/config.rs b/src/config.rs
index 6e4d484..4d8f21e 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,5 +1,4 @@
 use serde::{Deserialize, Serialize};
-use std::fs;
 use std::path::Path;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -36,54 +35,57 @@ pub struct SessionConfig {
 }
 
 impl Config {
-    /// Load configuration from a TOML file
-    /// Falls back to environment variables if file doesn't exist
+    /// Load configuration from a TOML file and environment variables
+    /// config-rs merges file config with environment variables automatically
     pub fn load(path: &str) -> Result<Self, Box<dyn std::error::Error>> {
+        let mut builder = config::Config::builder();
+
+        // Add default values first
+        let defaults = Self::defaults();
+        builder = builder.add_source(
+            config::Config::try_from(&defaults)
+                .map_err(|e| Box::new(e) as Box<dyn std::error::Error>)?,
+        );
+
+        // Load from file if it exists
         if Path::new(path).exists() {
-            let content = fs::read_to_string(path)?;
-            let config: Config = toml::from_str(&content)?;
-            Ok(config)
-        } else {
-            // Fall back to environment variables
-            Ok(Config::from_env())
+            builder = builder.add_source(config::File::with_name(path).required(false));
         }
+
+        // Override with environment variables
+        // Environment variables should be prefixed with the app name and use __ for nesting
+        // e.g., WEIGHT_TRACKER_OIDC__CLIENT_ID for oidc.client_id
+        builder = builder.add_source(
+            config::Environment::with_prefix("WEIGHT_TRACKER")
+                .try_parsing(true)
+                .separator("__"),
+        );
+
+        let config = builder.build()?;
+        let result: Config = config.try_deserialize()?;
+        Ok(result)
     }
 
-    /// Load configuration from environment variables
-    pub fn from_env() -> Self {
-        let client_id =
-            std::env::var("OIDC_CLIENT_ID").unwrap_or_else(|_| "your_client_id".to_string());
-        let client_secret = std::env::var("OIDC_CLIENT_SECRET")
-            .unwrap_or_else(|_| "your_client_secret".to_string());
-        let auth_url = std::env::var("OIDC_AUTH_URL")
-            .unwrap_or_else(|_| "https://your-provider.com/auth".to_string());
-        let token_url = std::env::var("OIDC_TOKEN_URL")
-            .unwrap_or_else(|_| "https://your-provider.com/token".to_string());
-        let redirect_url = std::env::var("OIDC_REDIRECT_URL")
-            .unwrap_or_else(|_| "http://localhost:3000/auth/callback".to_string());
-        let host = std::env::var("SERVER_HOST").unwrap_or_else(|_| "127.0.0.1".to_string());
-        let port = std::env::var("SERVER_PORT")
-            .unwrap_or_else(|_| "3000".to_string())
-            .parse()
-            .unwrap_or(3000);
-        let database_url = std::env::var("DATABASE_URL")
-            .unwrap_or_else(|_| "sqlite:weight_tracker.db".to_string());
-        let session_secret = std::env::var("SESSION_SECRET").unwrap_or_else(|_| {
-            "your_secret_key_that_is_long_enough_so_the_library_does_not_complain".to_string()
-        });
-
+    /// Get default configuration values
+    fn defaults() -> Self {
         Config {
             oidc: OidcConfig {
-                client_id,
-                client_secret,
-                auth_url,
-                token_url,
-                redirect_url,
+                client_id: "your_client_id".to_string(),
+                client_secret: "your_client_secret".to_string(),
+                auth_url: "https://your-provider.com/auth".to_string(),
+                token_url: "https://your-provider.com/token".to_string(),
+                redirect_url: "http://localhost:3000/auth/callback".to_string(),
+            },
+            server: ServerConfig {
+                host: "127.0.0.1".to_string(),
+                port: 3000,
+            },
+            database: DatabaseConfig {
+                url: "sqlite:weight_tracker.db".to_string(),
             },
-            server: ServerConfig { host, port },
-            database: DatabaseConfig { url: database_url },
             session: SessionConfig {
-                secret: session_secret,
+                secret: "your_secret_key_that_is_long_enough_so_the_library_does_not_complain"
+                    .to_string(),
             },
         }
     }
diff --git a/src/main.rs b/src/main.rs
index cba8642..a256d1f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,9 +5,11 @@ use weight_tracker::{AppState, create_app, config::Config};
 #[tokio::main]
 async fn main() {
     // Load configuration from config.toml or environment variables
-    let config = Config::load("config.toml").unwrap_or_else(|_| {
-        println!("config.toml not found, using environment variables");
-        Config::from_env()
+    // config-rs automatically merges file + environment + defaults
+    let config = Config::load("config.toml").unwrap_or_else(|e| {
+        eprintln!("Failed to load configuration: {}", e);
+        eprintln!("Using default values. Set environment variables prefixed with WEIGHT_TRACKER_ to override.");
+        std::process::exit(1);
     });
 
     // Set up database