/* ============================================================
   LAYOUT — App Shell, Header, Sidebar, Main, Info Panel
   Three-column grid: sidebar | main | info-panel
   ============================================================ */

/* ── App Shell (master grid) ── */
.app-shell {
  display: grid;
  grid-template-rows:    var(--header-h) 1fr;
  grid-template-columns: var(--sidebar-w) 1fr var(--info-w);
  height:  100vh;
  width:   100vw;
}

/* ── Header (spans all columns) ── */
.header {
  grid-column: 1 / -1;
  display:     flex;
  align-items: center;
  padding:     0 16px;
  background:  var(--bg-1);
  border-bottom: 1px solid var(--border);
  gap:   16px;
  z-index: 10;
}

.logo {
  font-family:    var(--font-display);
  font-size:      28px;
  letter-spacing: 2px;
  color:          var(--accent-cyan);
  text-shadow:    var(--glow-cyan);
  flex-shrink:    0;
}

.logo span { color: var(--text-secondary); }

.header-tagline {
  font-size: 11px;
  color:     var(--text-muted);
}

.header-controls {
  display:     flex;
  align-items: center;
  gap:         8px;
  margin-left: auto;
}

/* ── Sidebar ── */
.sidebar {
  background:   var(--bg-1);
  border-right: 1px solid var(--border);
  overflow-y:   auto;
  padding:      12px 0;
}

.sidebar-section       { margin-bottom: 4px; }

.sidebar-section-title {
  font-size:      10px;
  font-weight:    700;
  letter-spacing: 1.5px;
  color:          var(--text-muted);
  text-transform: uppercase;
  padding:        8px 16px 4px;
}

/* ── Main Content ── */
.main {
  display:        flex;
  flex-direction: column;
  overflow:       hidden;
  background:     var(--bg-0);
}

/* ── Info Panel (right sidebar) ── */
.info-panel {
  background:   var(--bg-1);
  border-left:  1px solid var(--border);
  overflow-y:   auto;
  display:      flex;
  flex-direction: column;
}

/* ── Responsive breakpoint ── */
@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 220px 1fr;
    grid-template-rows:    var(--header-h) 1fr auto;
  }

  .info-panel { display: none; }
}