server {
    listen 80;
    server_name reserve.xn--15t503c5up.com;

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    # LLM API reverse proxy
    location /api/llm/ {
        proxy_pass http://llm-proxy:9405;
        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_buffering off;
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    http2 on;
    server_name reserve.xn--15t503c5up.com;

    # SSL certificates
    ssl_certificate     /etc/letsencrypt/live/reserve.xn--15t503c5up.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/reserve.xn--15t503c5up.com/privkey.pem;

    # Modern SSL settings
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets off;

    # HSTS
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    add_header X-Frame-Options DENY always;
    add_header X-Content-Type-Options nosniff always;
    add_header X-XSS-Protection "1; mode=block" always;

    # Gzip
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

    root /usr/share/nginx/html;
    index index.html;

    # LLM API reverse proxy
    location /api/llm/ {
        proxy_pass http://llm-proxy:9405;
        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_buffering off;
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
    }

    # Chinese chat frontend entry
    location = /chat {
        try_files /chat.html =404;
    }

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

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # No cache for index.html
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma no-cache;
        add_header Expires 0;
    }
}