/* ==========================================================================
   Nexus Terminal — Application Layout
   Grid shell, sidebar, tab bar, workspace, and status bar structure.
   ========================================================================== */

/* -----------------------------------------------------------------------
   Main application grid
   ----------------------------------------------------------------------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--tab-bar-height) 1fr var(--status-bar-height);
  height: 100vh;
  overflow: hidden;
  background: var(--bg-base);
}

/* Collapsed sidebar variant */
.app.sidebar-collapsed {
  grid-template-columns: var(--sidebar-width-collapsed) 1fr;
}

/* -----------------------------------------------------------------------
   Sidebar
   ----------------------------------------------------------------------- */
.sidebar {
  grid-row: 1 / -1;
  grid-column: 1;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: var(--z-sticky);
}

/* -----------------------------------------------------------------------
   Tab bar
   ----------------------------------------------------------------------- */
.tab-bar {
  grid-column: 2;
  grid-row: 1;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  min-height: var(--tab-bar-height);
  overflow: hidden;
}

.tab-list {
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none; /* Firefox */
}
.tab-list::-webkit-scrollbar {
  display: none;
}

/* -----------------------------------------------------------------------
   Workspace
   ----------------------------------------------------------------------- */
.workspace {
  grid-column: 2;
  grid-row: 2;
  position: relative;
  overflow: hidden;
  background: var(--bg-base);
  display: flex;
  flex-direction: column;
}

/* Panel container — fills workspace, holds session panels */
.panel-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

/* Individual session panel — one per tab, fills the panel container */
.session-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Terminal container — fills workspace */
.terminal-container {
  position: absolute;
  inset: 0;
  padding: 0;
}

/* -----------------------------------------------------------------------
   Status bar
   ----------------------------------------------------------------------- */
.status-bar {
  grid-column: 2;
  grid-row: 3;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  gap: var(--space-4);
  white-space: nowrap;
  overflow: hidden;
}

.status-bar span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.status-spacer {
  flex: 1;
}

.status-update {
  border: 1px solid var(--accent);
  background: rgba(78, 205, 196, 0.12);
  color: var(--accent);
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: 999px;
  cursor: pointer;
  transition:
    background 150ms ease,
    color 150ms ease,
    border-color 150ms ease;
}

.status-update:hover {
  background: rgba(78, 205, 196, 0.2);
  color: var(--text-primary);
  border-color: var(--accent-strong, var(--accent));
}

.status-update.is-hidden {
  display: none;
}

/* Status bar indicator dots */
.status-bar .status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.status-dot.is-connected {
  background: var(--success);
}
.status-dot.is-connecting {
  background: var(--warning);
}
.status-dot.is-error {
  background: var(--error);
}
.status-dot.is-disconnected {
  background: var(--text-tertiary);
}

/* Latency indicator */
#status-latency {
  font-variant-numeric: tabular-nums;
}
#status-latency.latency-good {
  color: var(--success);
}
#status-latency.latency-warn {
  color: var(--warning);
}
#status-latency.latency-bad {
  color: var(--error);
}

/* -----------------------------------------------------------------------
   Resize handle (between sidebar and workspace)
   ----------------------------------------------------------------------- */
.resize-handle {
  position: absolute;
  top: 0;
  right: -3px;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: var(--z-sticky);
}
.resize-handle:hover,
.resize-handle.is-dragging {
  background: var(--accent-muted);
}