body {
  display: flex;
  flex-direction: column;
}

.topbar {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar h1 {
  font-size: 20px;
  font-weight: 600;
}

.container {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

.sidebar {
  width: 320px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: relative;
  background: var(--bg);
}

.sidebar-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-header {
  flex: 1;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.input-area {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}