server {
    listen 80;
    server_name _;

    # 管理后台前端构建产物（dist 挂载到 /usr/share/nginx/html）
    root /usr/share/nginx/html;
    index index.html;

    # 与后端 multer 50MB 上传限制对齐，避免 /api 上传被 nginx 413 拦截
    client_max_body_size 50m;
    gzip on;
    gzip_types text/plain text/css application/json application/javascript image/svg+xml;

    # 带内容指纹的构建资源：长缓存（正则含 {}，必须加引号避免被当作块定界符）
    location ~* "\.[0-9a-f]{8}\.(js|css|png|jpg|jpeg|gif|webp|svg|woff2?)$" {
        expires 365d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # 素材库静态文件：backend 上传目录挂载在 dist/uploads，前端直接静态直出
    location /uploads/ {
        expires 7d;
        try_files $uri =404;
    }

    # SPA history 回退
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API 反代到 backend 容器（compose 网络内服务名解析）
    location /api/ {
        proxy_pass http://backend:8000;
        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;
    }
}