body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f0f5;
  margin: 0;
  padding: 0;
}

.chat-container {
  max-width: 600px;
  margin: 30px auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  overflow: hidden;
}

header {
  display: flex;
  align-items: center;
  background: #004d40;
  color: #fff;
  padding: 20px;
  text-align: left;
}

.logo {
  height: 60px;
  margin-right: 15px;
}

.header-text {
  display: flex;
  flex-direction: column;
}

.header-text h1 {
  margin: 0;
  font-size: 1.8em;
}

.tagline {
  margin-top: 5px;
  font-style: italic;
  font-size: 0.9em;
  color: #c8e6c9;
}

.chat-box {
  padding: 20px;
  height: 400px;
  overflow-y: auto;
  background: #fafafa;
  display: flex;
  flex-direction: column;
}

.bubble {
  padding: 12px 16px;
  margin: 10px 0;
  border-radius: 18px;
  max-width: 80%;
  line-height: 1.4;
  word-wrap: break-word;
}

.user {
  background: #e0f7fa;
  align-self: flex-end;
  margin-left: auto;
}

.bot {
  background: #c8e6c9;
  align-self: flex-start;
  margin-right: auto;
}

#chat-form {
  display: flex;
  border-top: 1px solid #ddd;
}

#user-input {
  flex: 1;
  padding: 15px;
  border: none;
  font-size: 1em;
}

#chat-form button {
  padding: 0 20px;
  background: #00796b;
  color: #fff;
  border: none;
  font-weight: bold;
  cursor: pointer;
}