server {
    listen 80;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # SPA 路由支持 - 所有路径都返回 index.html
    location / {
        try_files $uri $uri/ /index.html;
    }



    # Markdown 接口说明，直接返回文本内容
    location = /apidoc {
        types { }
        default_type text/plain;
        charset utf-8;
        try_files /apidoc =404;
        add_header Cache-Control "no-store";
    }

    # 知识库静态 JSON API，接口路径不存在时返回 404，避免被 SPA 回退到 index.html
    location /api/ {
        try_files $uri =404;
        add_header Cache-Control "no-store";
    }

    # 一图流图片目录，由 Docker 挂载提供，支持运行时新增图片
    location /learning-images/ {
        alias /usr/share/nginx/html/learning-images/;
        autoindex on;
        charset utf-8;
        add_header Cache-Control "no-store";
    }

    # 静态资源缓存
    location /assets {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # gzip 压缩
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
    gzip_min_length 1000;
}