.chat-layout {
  display: flex;
  gap: 0;
  flex: 1;
  min-height: 0;
}

.chat-sidebar {
  width: 280px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.chat-sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.chat-session-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.chat-session-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 2px;
}

.chat-session-item:hover {
  background: var(--bg-glass);
}

.chat-session-item.active {
  background: var(--primary-glow);
}

.chat-session-item-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-session-item-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.chat-message {
  display: flex;
  gap: 12px;
  max-width: 800px;
  animation: fadeIn 0.3s ease forwards;
}

.chat-message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

.chat-message.user .chat-message-avatar {
  background: var(--primary);
  color: white;
}

.chat-message.assistant .chat-message-avatar {
  background: var(--primary-glow);
  color: var(--primary);
}

.chat-message-content {
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  line-height: 1.7;
  max-width: 85%;
}

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

.chat-message.assistant .chat-message-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.chat-message-content p { margin: 4px 0; }
.chat-message-content code {
  background: var(--bg-glass);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
  font-family: 'SF Mono', monospace;
}
.chat-message-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
}

.chat-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.chat-source {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-glass);
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border);
}

.chat-source:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.chat-input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

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

.chat-input {
  flex: 1;
  resize: none;
  min-height: 48px;
  max-height: 160px;
  padding: 14px 16px;
}

.chat-suggestions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 24px;
  border-top: 1px solid var(--border);
}

.chat-suggestion {
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: none;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}

.chat-suggestion:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-glow);
}

.chat-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.chat-empty h3 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

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

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  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%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-4px); }
}

@media (max-width: 768px) {
  .chat-layout { flex-direction: column; }
  .chat-sidebar { width: 100%; max-height: 200px; }
  .chat-messages { padding: 16px; }
  .chat-input-area { padding: 12px 16px; }
}