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

:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #8b5cf6;
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --surface-light: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --user-bubble: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --ai-bubble: #334155;
  --border-radius: 16px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  color: var(--text-primary);
}

.chat-container {
  width: 100%;
  max-width: 800px;
  height: 90vh;
  background: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(20px);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-header {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  padding: 24px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-header h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.session-info {
  font-size: 12px;
  opacity: 0.9;
  font-family: "Courier New", monospace;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-messages::-webkit-scrollbar {
  width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--surface-light);
  border-radius: 4px;
}

.welcome-message {
  text-align: center;
  padding: 32px;
  color: var(--text-secondary);
  font-size: 16px;
}

.message {
  display: flex;
  gap: 12px;
  animation: slideIn 0.3s ease-out;
}

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

.message.user {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: var(--user-bubble);
}

.message.ai .message-avatar {
  background: var(--ai-bubble);
}

.message-content {
  max-width: 70%;
  padding: 16px 20px;
  border-radius: 18px;
  line-height: 1.6;
  word-wrap: break-word;
}

.message.user .message-content {
  background: var(--user-bubble);
  color: white;
  border-bottom-right-radius: 4px;
}

.message.ai .message-content {
  background: var(--ai-bubble);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.message-meta {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 4px;
  opacity: 0.7;
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
}

.chat-input-container {
  padding: 20px;
  background: var(--surface-color);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

#message-input {
  flex: 1;
  background: var(--surface-light);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 14px 18px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  resize: none;
  max-height: 120px;
  transition: all 0.2s ease;
}

#message-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

#message-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.send-button {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.send-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
}

.send-button:active {
  transform: translateY(0);
}

.send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 8px 0;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-color);
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%,
  60%,
  100% {
    transform: translateY(0);
    opacity: 0.5;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .chat-container {
    height: 100vh;
    border-radius: 0;
  }

  .message-content {
    max-width: 85%;
  }

  .chat-header h1 {
    font-size: 20px;
  }
}