body{margin:0;font-family:Arial,sans-serif;background:#f5f7fa;color:#333;}
header{background:#111;color:#fff;padding:15px;text-align:center;}
.nav-lang{position:absolute;top:15px;right:15px;}
.nav-lang button{margin-left:5px;padding:5px 10px;cursor:pointer;}
.card{background:#fff;padding:20px;margin:20px;border-radius:8px;box-shadow:0 3px 10px rgba(0,0,0,0.1);}
.chat-btn{position:fixed;bottom:20px;right:20px;background:#111;color:#fff;padding:15px;border-radius:50%;cursor:pointer;}
.chat-box{position:fixed;bottom:90px;right:20px;width:320px;background:#fff;border-radius:10px;box-shadow:0 5px 20px rgba(0,0,0,0.3);display:none;flex-direction:column;padding:10px;}
.chat-box input, .chat-box textarea{width:100%;margin-top:5px;padding:8px;}
.chat-box button{padding:8px;margin-top:5px;width:100%;background:#111;color:#fff;border:none;}
.whatsapp{position:fixed;bottom:20px;left:20px;background:#25D366;color:#fff;padding:15px;border-radius:50%;text-decoration:none;font-size:20px;}
.success{color:green;}
.error{color:red;}
.login-container{max-width:400px;margin:50px auto;background:#fff;padding:20px;border-radius:8px;box-shadow:0 3px 10px rgba(0,0,0,0.1);}