body { 
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
  margin: 0; 
  padding: 0;
  padding-bottom: 75px; 
  background-color: #e5ddd5; /* Fundo idêntico ao WhatsApp */
}

#messages { 
  list-style-type: none; 
  margin: 0; 
  padding: 15px; 
  display: flex;
  flex-direction: column;
  gap: 12px; 
}

#messages li { 
  padding: 10px 15px; 
  border-radius: 15px;
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
  max-width: 85%; 
  word-wrap: break-word; 
  line-height: 1.4;
}

.message-mine {
  align-self: flex-end;
  background: #dcf8c6; 
  border-top-right-radius: 0 !important; /* Efeito do canto do balão */
}

.message-other {
  align-self: flex-start;
  background: #ffffff;
  border-top-left-radius: 0 !important;
}


.message-system {
  align-self: center;
  background: transparent;
  box-shadow: none !important;
  font-size: 0.85em;
  color: #666;
  padding: 5px;
}


#form { 
  background: #f0f0f0; 
  padding: 10px; 
  position: fixed; 
  bottom: 0; 
  left: 0;
  width: 100%; 
  display: flex; 
  box-sizing: border-box; 
  box-shadow: 0 -1px 5px rgba(0,0,0,0.05);
}

#input { 
  border: none; 
  padding: 12px 15px; 
  flex-grow: 1; 
  border-radius: 25px; 
  margin-right: 10px; 
  font-size: 16px; 
  outline: none;
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

#form > button { 
  background: #0084ff; 
  border: none; 
  padding: 12px 20px; 
  color: white; 
  border-radius: 25px; 
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: background 0.2s;
}

#form > button:hover {
  background: #006bce;
}


#login-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.7); /* Fundo escuro transparente */
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000; /* Fica sempre por cima do chat */
}

#login-modal {
  background: white;
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  box-shadow: 0 5px 20px rgba(0,0,0,0.3);
  width: 85%;
  max-width: 350px;
}

#login-modal h2 { margin-top: 0; color: #333; }
#login-modal p { color: #666; margin-bottom: 20px; font-size: 14px; }

#username-input {
  width: 100%;
  padding: 12px;
  border: 2px solid #e5ddd5;
  border-radius: 8px;
  margin-bottom: 15px;
  box-sizing: border-box;
  font-size: 16px;
  outline: none;
}

#username-input:focus { border-color: #25D366; }

#join-btn {
  background: #25D366; /* Verde do WhatsApp */
  color: white;
  border: none;
  padding: 12px;
  width: 100%;
  border-radius: 8px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}

#join-btn:hover { background: #20b858; }