html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  font-family: system-ui, sans-serif;
}

/* ROOT GRID */
#app-shell {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  height: 100vh;
  min-height: 0;
}

/* LEFT COLUMN */
#left-column {
  display: grid;
  grid-template-rows: minmax(0, 8fr) minmax(0, 1fr);
  border-right: 1px solid #ddd;
  min-height: 0;
}

/* Left main (scrollable dynamic content) */
#left-main {
  overflow-y: auto;
  padding: 1.5rem;
  min-height: 0;
}

/* Left bottom static area */
#left-footer {
  padding: 1rem;
  border-top: 1px solid #ddd;
  background: #fafafa;
}

/* RIGHT CHAT COLUMN */
#chat-column {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  min-height: 0;
}