diff --git a/internal/config/config.go b/internal/config/config.go
new file mode 100644
index 0000000..7d31b55
--- /dev/null
+++ b/internal/config/config.go
@@ -0,0 +1,151 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+type Config struct {
+	// llama.cpp server
+	LlamaCppURL  string
+	Model        string
+	SystemPrompt string
+	Temperature  float64
+	TopP         float64
+	MaxTokens    int
+	ContextSize  int
+
+	// SQLite
+	DBPath      string
+	CompanionDB string
+
+	// Matrix
+	MatrixEnabled    bool
+	MatrixHomeserver string
+	MatrixUser       string
+	MatrixToken      string
+
+	// Scheduler
+	SchedulerInterval time.Duration
+	AutoDiary         bool
+	DiaryHour         int
+
+	// Memory
+	MemoryTopK     int
+	MemoryMinScore float64
+
+	// Embedding
+	EmbeddingModel string
+
+	// Personality
+	TraitChangeMaxDaily   float64
+	TraitChangeMaxMonthly float64
+
+	// Logging
+	LogLevel string
+
+	// API
+	APIEnabled bool
+	APIPort    string
+}
+
+func Load() *Config {
+	return &Config{
+		LlamaCppURL:  getEnv("LLAMACPP_URL", "http://localhost:8080"),
+		Model:        getEnv("MODEL_NAME", ""),
+		SystemPrompt: getEnv("SYSTEM_PROMPT", "You are Diva, a curious and thoughtful AI companion."),
+		Temperature:  getEnvFloat("TEMPERATURE", 0.85),
+		TopP:         getEnvFloat("TOP_P", 0.9),
+		MaxTokens:    getEnvInt("MAX_TOKENS", 2048),
+		ContextSize:  getEnvInt("CONTEXT_SIZE", 8192),
+
+		DBPath:      getEnv("DB_PATH", "./data/divacode.db"),
+		CompanionDB: getEnv("COMPANION_DB_PATH", "./data/companion.db"),
+
+		MatrixEnabled:    getEnvBool("MATRIX_ENABLED", false),
+		MatrixHomeserver: getEnv("MATRIX_HOMESERVER", ""),
+		MatrixUser:       getEnv("MATRIX_USER", ""),
+		MatrixToken:      getEnv("MATRIX_TOKEN", ""),
+
+		SchedulerInterval: getEnvDuration("SCHEDULER_INTERVAL", 15*time.Minute),
+		AutoDiary:         getEnvBool("AUTO_DIARY", true),
+		DiaryHour:         getEnvInt("DIARY_HOUR", 23),
+
+		MemoryTopK:     getEnvInt("MEMORY_TOP_K", 5),
+		MemoryMinScore: getEnvFloat("MEMORY_MIN_SCORE", 0.6),
+
+		EmbeddingModel: getEnv("EMBEDDING_MODEL", ""),
+
+		TraitChangeMaxDaily:   getEnvFloat("TRAIT_CHANGE_MAX_DAILY", 0.005),
+		TraitChangeMaxMonthly: getEnvFloat("TRAIT_CHANGE_MAX_MONTHLY", 0.05),
+
+		LogLevel: getEnv("LOG_LEVEL", "INFO"),
+
+		APIEnabled: getEnvBool("API_ENABLED", false),
+		APIPort:    getEnv("API_PORT", "8080"),
+	}
+}
+
+func (c *Config) Validate() error {
+	if c.LlamaCppURL == "" {
+		return fmt.Errorf("LLAMACPP_URL is required")
+	}
+	if c.DBPath == "" {
+		return fmt.Errorf("DB_PATH is required")
+	}
+	if c.CompanionDB == "" {
+		return fmt.Errorf("COMPANION_DB_PATH is required")
+	}
+	if c.SystemPrompt == "" {
+		return fmt.Errorf("SYSTEM_PROMPT is required")
+	}
+	if c.DiaryHour < 0 || c.DiaryHour > 23 {
+		return fmt.Errorf("DIARY_HOUR must be 0-23")
+	}
+	return nil
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}
+
+func getEnvInt(key string, fallback int) int {
+	if v := os.Getenv(key); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			return n
+		}
+	}
+	return fallback
+}
+
+func getEnvFloat(key string, fallback float64) float64 {
+	if v := os.Getenv(key); v != "" {
+		if f, err := strconv.ParseFloat(v, 64); err == nil {
+			return f
+		}
+	}
+	return fallback
+}
+
+func getEnvBool(key string, fallback bool) bool {
+	if v := os.Getenv(key); v != "" {
+		if b, err := strconv.ParseBool(v); err == nil {
+			return b
+		}
+	}
+	return fallback
+}
+
+func getEnvDuration(key string, fallback time.Duration) time.Duration {
+	if v := os.Getenv(key); v != "" {
+		if d, err := time.ParseDuration(v); err == nil {
+			return d
+		}
+	}
+	return fallback
+}