def parse_user_agent(user_agent):
    """Sehr einfache, dependency-freie Grobzuordnung von Plattform/Browser aus dem
    User-Agent-String - reicht für die Dashboard-Statistik, muss nicht exakt sein."""
    ua = (user_agent or "").lower()

    if "iphone" in ua or "ipad" in ua or "ipod" in ua:
        platform = "iOS"
    elif "android" in ua:
        platform = "Android"
    elif "windows" in ua:
        platform = "Windows"
    elif "macintosh" in ua or "mac os x" in ua:
        platform = "macOS"
    elif "linux" in ua:
        platform = "Linux"
    else:
        platform = "Unbekannt"

    if "edg/" in ua or "edga" in ua or "edgios" in ua:
        browser = "Edge"
    elif "opr/" in ua or "opera" in ua:
        browser = "Opera"
    elif "firefox" in ua or "fxios" in ua:
        browser = "Firefox"
    elif "crios" in ua or "chrome" in ua:
        browser = "Chrome"
    elif "safari" in ua:
        browser = "Safari"
    else:
        browser = "Unbekannt"

    return platform, browser