server {
    listen 80;
    server_name localhost;
    
    root /usr/share/nginx/html;
    index index.html;
    
    # Docker 内部 DNS 解析器
    resolver 127.0.0.11 valid=30s;
    
    # Vue Router history mode
    location / {
        try_files $uri $uri/ /index.html;
    }
    
    # API 代理到后端
    # 使用环境变量 BACKEND_HOST，通过 Docker DNS 解析
    location /api/ {
        set $backend ${BACKEND_HOST}:8000;
        proxy_pass http://$backend/api/;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 120s;
        proxy_connect_timeout 10s;
    }
    
    # 静态资源缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
    
    # 禁止访问隐藏文件
    location ~ /\. {
        deny all;
    }
}