.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, var(--grid-glow-1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 70%, var(--grid-glow-2) 0%, transparent 60%),
    var(--grid-base);
  transition: background 0.25s ease;
}

.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 320px 1fr;
  height: 100vh;
}

.chat-area {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
}