.app {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
  padding: 20px;
  gap: 20px;
  max-width: 1600px;
  margin: 0 auto;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 4px;
}
.app-header h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.3px;
}

.app-body {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  min-height: 0;
  align-items: stretch;
  height: 100%;
}

@media (max-width: 768px) {
  .app-body { grid-template-columns: 1fr; }
}