server {
    listen       80;
    server_name  localhost;

    # ----------------------------------------
    # 보안 헤더
    # ----------------------------------------
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    # 화상회의(LiveKit)용 카메라/마이크는 자기 출처(self)에 허용. 위치정보는 차단 유지.
    add_header Permissions-Policy "geolocation=(), microphone=(self), camera=(self)" always;

    # ----------------------------------------
    # 압축 (Gzip)
    # ----------------------------------------
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/javascript application/javascript application/json application/xml image/svg+xml;

    # ----------------------------------------
    # SPA 라우팅
    # ----------------------------------------
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
        try_files $uri $uri/ /index.html;

        # 정적 자원 캐싱 (SPA 빌드 산출물은 해시 파일명이라 장기 캐싱 가능)
        location ~* \.(?:js|css|woff2?|ttf|svg|png|jpg|jpeg|gif|ico)$ {
            expires 30d;
            add_header Cache-Control "public, immutable";
        }
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # 숨김 파일 접근 차단
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
}