/* ═══════════════════════════════════════════════════════════════════
   03 LAYOUT
   Main area, tab content, panel layout
   Sourced from monolithic main.css lines 392-466.
   ═══════════════════════════════════════════════════════════════════ */

/* ── Main area ──────────────────────────────────────────────────── */
#main {
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ── Tab content ────────────────────────────────────────────────── */
.tab-content {
  position: absolute;
  inset: 0;
  display: flex;
  overflow: hidden;
}
.tab-content.hidden { display: none; }

/* ── Panels (Liquid Glass) ──────────────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--glass-border);
  position: relative;
  z-index: 1;
}
.panel:last-child { border-right: none; }
.panel-left {
  width: var(--panel-w); flex-shrink: 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.panel-right {
  width: var(--panel-w); flex-shrink: 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: none; border-left: 1px solid var(--glass-border);
}
.panel-center { flex: 1; background: var(--glass-bg-subtle); }
.panel-editor { padding: 16px; overflow-y: auto; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--glass-border);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), transparent);
}

.lib-controls {
  display: flex;
  gap: 6px;
  padding: 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.inp-search {
  flex: 1;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.sel-sm {
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg3);
  border: 1px solid var(--border);
}