.sidebar {
  width: 260px;
  background: #f8f8f8;
  border-right: 1px solid #e0e0e0;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid #e0e0e0;
}

.sidebar-header h1 {
  font-size: 18px;
  margin: 0 0 12px 0;
  color: #333;
}

.new-conversation-btn {
  width: 100%;
  padding: 10px;
  background: #4a90e2;
  border: 1px solid #4a90e2;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
  font-weight: 500;
}

.new-conversation-btn:hover {
  background: #357abd;
  border-color: #357abd;
}

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

.no-conversations {
  padding: 16px;
  text-align: center;
  color: #999;
  font-size: 14px;
}

.conversation-item {
  padding: 12px;
  margin-bottom: 4px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.conversation-item:hover {
  background: #f0f0f0;
}

.conversation-item.active {
  background: #e8f0fe;
  border: 1px solid #4a90e2;
}

.conversation-title {
  color: #333;
  font-size: 14px;
  margin-bottom: 4px;
}

.conversation-meta {
  color: #999;
  font-size: 12px;
}