:root {
  --primary-color: #f6821f;
  --secondary-color: #404041;
  --background-color: #f5f5f5;
  --chat-bg: #ffffff;
  --user-msg-bg: #e7f2fa;
  --ai-msg-bg: #f0f0f0;
  --system-msg-bg: #fff8e1;
  --text-color: #333333;
  --light-text: #666666;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --input-bg: #ffffff;
  --button-hover: #e67e22;
  --error-color: #e74c3c;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

header h1 {
  color: var(--primary-color);
  margin-bottom: 5px;
}

header p {
  color: var(--light-text);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.chat-container {
  background-color: var(--chat-bg);
  border-radius: 10px;
  box-shadow: 0 4px 6px var(--shadow-color);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.chat-messages {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 15px;
  max-height: 60vh;
}

.message {
  display: flex;
  margin-bottom: 15px;
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-content {
  padding: 12px 15px;
  border-radius: 10px;
  max-width: 80%;
}

.message.user {
  justify-content: flex-end;
}

.message.user .message-content {
  background-color: var(--user-msg-bg);
  border-bottom-right-radius: 0;
}

.message.ai .message-content {
  background-color: var(--ai-msg-bg);
  border-bottom-left-radius: 0;
}

.message.system .message-content {
  background-color: var(--system-msg-bg);
  width: 100%;
  border-radius: 5px;
}

.message p {
  margin: 0;
  word-wrap: break-word;
}

.chat-input-container {
  display: flex;
  padding: 15px;
  background-color: var(--input-bg);
  border-top: 1px solid var(--border-color);
}

#chat-input {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  resize: none;
  font-family: inherit;
  font-size: 16px;
  outline: none;
  transition: border-color 0.3s;
}

#chat-input:focus {
  border-color: var(--primary-color);
}

#send-button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  margin-left: 10px;
  cursor: pointer;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

#send-button:hover {
  background-color: var(--button-hover);
}

.controls {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

.control-button {
  background-color: var(--secondary-color);
  color: white;
  border: none;
  border-radius: 5px;
  padding: 8px 15px;
  cursor: pointer;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.control-button:hover {
  background-color: #333;
}

.typing-indicator {
  display: flex;
  padding: 12px 15px;
  background-color: var(--ai-msg-bg);
  border-radius: 10px;
  border-bottom-left-radius: 0;
  width: fit-content;
}

.typing-indicator span {
  height: 8px;
  width: 8px;
  background-color: var(--light-text);
  border-radius: 50%;
  display: inline-block;
  margin-right: 3px;
  animation: bounce 1.3s linear infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.15s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.3s;
  margin-right: 0;
}

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-4px); }
}

.error {
  background-color: var(--error-color);
  color: white;
  padding: 10px;
  border-radius: 5px;
  margin-bottom: 15px;
  text-align: center;
}

footer {
  text-align: center;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: var(--light-text);
  font-size: 14px;
}

/* Responsive styles */
@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .message-content {
    max-width: 90%;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 24px;
  }
  
  .message-content {
    max-width: 95%;
  }
}