.chat-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--background);
}

/* Global top bar */
.global-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  height: 72px;
  min-height: 72px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 20;
  flex-shrink: 0;
}

.global-bar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.global-bar-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}

.global-bar-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}

.global-bar-offline {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #e53935;
  font-size: 13px;
  font-weight: 500;
}

.offline-label {
  font-size: 13px;
}

/* Body below global bar */
.chat-body {
  display: flex;
  flex: 1;
  min-height: 0;  /* allows body to shrink when mobile keyboard resizes viewport */
  overflow: hidden;
}

@media (max-width: 767px) {
  .chat-layout {
    position: relative;
  }
  .chat-body {
    overflow: hidden;
    min-height: 0;
  }
  .global-bar {
    height: 56px;
    min-height: 56px;
  }
}

[data-theme="dark"] .global-bar {
  background: var(--surface);
  border-color: var(--border);
}

.no-chat-selected {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-tertiary);
  font-size: 14px;
  gap: 4px;
  user-select: none;
}