* { box-sizing: border-box; }
body {
  font-family: "Helvetica Neue", sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}

#app { max-width: 800px; margin: 20px auto; padding: 20px; }

.screen { background: white; padding: 20px; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }

input, button {
  padding: 10px;
  margin: 10px 0;
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 5px;
}

button {
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover { background: #0056b3; }

.tab {
  background: #eee;
  border-bottom: 3px solid transparent;
}
.tab.active {
  background: #007bff;
  color: white;
  border-bottom: 3px solid #0056b3;
}

#auth-tabs { display: flex; }
#auth-tabs button { flex: 1; }

.error { color: red; }

.messages {
  height: 400px;
  overflow-y: auto;
  border: 1px solid #eee;
  margin: 10px 0;
  padding: 10px;
  background: #f9f9f9;
  border-radius: 8px;
}

.message {
  margin: 10px 0;
  display: flex;
  align-items: flex-start;
}

.message .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-right: 10px;
}

.message .content {
  background: #e3f2fd;
  padding: 8px 12px;
  border-radius: 18px;
  max-width: 70%;
}

.message .info {
  font-size: 12px;
  color: #666;
  margin-top: 4px;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.chat-input {
  display: flex;
  gap: 10px;
}

#admin-panel {
  margin-top: 20px;
  padding: 15px;
  border: 1px dashed #007bff;
  border-radius: 8px;
}

#user-list ul {
  list-style: none;
  padding: 0;
}

#user-list li {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px solid #eee;
}