frontend/src/components/chat.css

.chat-container {
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  height: 600px;
}

.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.empty-state {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-align: center;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.message {
  margin-bottom: 1.5rem;
  display: flex;
  gap: 1rem;
  animation: slideIn 0.3s ease;
}

.message-bubble {
  max-width: 70%;
  padding: 1.25rem 1.5rem;
  border-radius: 16px;
  line-height: 1.6;
}

.message.user .message-bubble {
  background: var(--gradient-primary);
  color: white;
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

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

.typing-indicator {
  display: flex;
  gap: 0.3rem;
  padding: 0.25rem 0;
}

.typing-indicator span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-secondary);
  animation: pulse 1.2s infinite;
}

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

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

.message-sources {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

.message.user .message-sources {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.sources-loading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-style: italic;
}

.source-item {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: rgba(102, 126, 234, 0.08);
  border-radius: 8px;
  font-size: 0.85rem;
}

.message.user .source-item {
  background: rgba(255, 255, 255, 0.1);
}

.source-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.chat-input-area {
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

.chat-input-wrapper {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.chat-input {
  flex: 1;
  padding: 1rem 1.5rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
  background: var(--bg-card);
  color: var(--text-primary);
}

.chat-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.chat-input:disabled {
  opacity: 0.6;
}

.btn-send {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--gradient-primary);
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.btn-send:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-cancel {
  background: var(--danger);
}

@media (max-width: 768px) {
  .message-bubble {
    max-width: 85%;
  }
}