*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial,Helvetica,sans-serif;
}

body{
    background:#101820;
    color:white;
}

.contenedor{
    width:95%;
    max-width:900px;
    margin:30px auto;
}

h2{
    text-align:center;
    margin-bottom:20px;
    color:#00ff66;
}

.login{
    display:flex;
    gap:10px;
    margin-bottom:15px;
}

.login input{
    flex:1;
    padding:12px;
    border:none;
    border-radius:8px;
    font-size:16px;
}

.login button{
    padding:12px 25px;
    background:#00cc44;
    color:white;
    border:none;
    border-radius:8px;
    cursor:pointer;
    font-size:16px;
}

#mensajes{
    height:500px;
    overflow-y:auto;
    background:#1b2430;
    border-radius:10px;
    padding:15px;
    margin-bottom:10px;
}

.mensaje{
    background:#263445;
    margin-bottom:10px;
    padding:10px;
    border-radius:8px;
}

.usuario{
    color:#00ff66;
    font-weight:bold;
}

.hora{
    color:#aaaaaa;
    font-size:12px;
    float:right;
}

.enviar{
    display:flex;
    gap:10px;
}

.enviar input{
    flex:1;
    padding:12px;
    border:none;
    border-radius:8px;
    font-size:16px;
}

.enviar button{
    width:130px;
    background:#00cc44;
    color:white;
    border:none;
    border-radius:8px;
    cursor:pointer;
    font-size:16px;
}