body {
  background: var(--bg);
  display: grid;
  grid-template-rows: var(--header-h) 1fr;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.app-header {
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  gap: 12px;
}

.app-header .brand {
  font-weight: 600;
  font-size: 16px;
  flex: 1;
  color: var(--text);
}

.app-header .actions {
  display: flex;
  gap: 4px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: var(--bg-hover);
}

.back-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.back-btn:hover {
  background: var(--bg-hover);
}

.app-main {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  overflow: hidden;
}

#sidebar {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--bg-secondary);
  overflow: hidden;
}

.filters {
  display: flex;
  gap: 4px;
  padding: 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  overflow-x: auto;
}

.filters button {
  padding: 6px 10px;
  border-radius: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.filters button:hover {
  background: var(--bg-hover);
}

.filters button.active {
  background: var(--accent);
  color: #fff;
}

#chat-view {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}