/* Top bar / activity bar / side panel / status bar.
 * Layout uses CSS grid on #app to lock all chrome to fixed positions. */

#app {
  display: grid;
  grid-template-rows: 48px 1fr 24px;
  grid-template-columns: 50px 280px 1fr 360px;
  grid-template-areas:
    "topbar    topbar       topbar    topbar"
    "activity  side         editor    plugin"
    "statusbar statusbar    statusbar statusbar";
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#app[data-side-collapsed="true"] {
  grid-template-columns: 50px 0 1fr 360px;
}
#app[data-plugin-collapsed="true"] {
  grid-template-columns: 50px 280px 1fr 0;
}
#app[data-side-collapsed="true"][data-plugin-collapsed="true"] {
  grid-template-columns: 50px 0 1fr 0;
}

@media (max-width: 1024px) {
  #app {
    grid-template-columns: 50px 280px 1fr 0;
  }
}
@media (max-width: 900px) {
  #app {
    grid-template-columns: 50px 0 1fr 0;
  }
}

#app[data-terminal-open="true"] {
  grid-template-rows: 48px 1fr 200px 24px;
  grid-template-areas:
    "topbar    topbar       topbar    topbar"
    "activity  side         editor    plugin"
    "activity  side         terminal  plugin"
    "statusbar statusbar    statusbar statusbar";
}

/* ───────────── Top bar ───────────── */

.topbar {
  grid-area: topbar;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
  -webkit-app-region: drag;
}
.topbar > * { -webkit-app-region: no-drag; }

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--text-primary);
  letter-spacing: 0.01em;
}
.topbar-brand img {
  width: 24px;
  height: 24px;
  display: block;
}
.topbar-brand .brand-mark {
  color: var(--accent);
}

.topbar-project {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}
.topbar-project input {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  min-width: 200px;
  text-align: center;
}
.topbar-project input:hover { border-color: var(--border-subtle); }
.topbar-project input:focus { border-color: var(--border-focus); outline: none; }

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.network-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.network-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

.btn-connect {
  background: var(--accent);
  color: var(--text-inverse);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 7px 14px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 120ms ease-out, box-shadow 120ms ease-out;
}
.btn-connect:hover { background: var(--accent-hover); box-shadow: var(--shadow-glow); }
.btn-connect:active { background: var(--accent-press); }

.btn-connect.connected {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}
.btn-connect.connected:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  box-shadow: none;
}
.btn-connect.connected::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

/* ───────────── Activity bar ───────────── */

.activity {
  grid-area: activity;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0;
  gap: 4px;
  position: relative;
}

.activity-btn {
  position: relative;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: color 150ms ease-out, background 120ms ease-out;
}
.activity-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}
.activity-btn.active {
  color: var(--text-primary);
}
.activity-btn.active::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  animation: fadeIn 150ms ease-out;
}
.activity-btn svg { width: 18px; height: 18px; display: block; }

.activity-divider {
  width: 24px;
  height: 1px;
  background: var(--border-subtle);
  margin: 4px 0;
}

.activity-tooltip {
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  margin-left: 8px;
  background: var(--bg-popover);
  color: var(--text-primary);
  font-size: var(--fs-xs);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  box-shadow: var(--shadow-elev-1);
  transition: opacity 80ms ease-out 80ms;
  z-index: 100;
}
.activity-btn:hover .activity-tooltip { opacity: 1; }

/* ───────────── Side panel ───────────── */

.side {
  grid-area: side;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: width 180ms cubic-bezier(0.4, 0, 0.2, 1);
}

.side-header {
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border-subtle);
}
.side-header-actions {
  display: inline-flex;
  gap: 4px;
}
.side-header-actions button {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}
.side-header-actions button:hover { color: var(--text-primary); background: var(--bg-hover); }

.side-content {
  flex: 1;
  overflow: auto;
  padding: 4px 0;
}

.side-section {
  padding: 8px 0;
}
.side-section + .side-section {
  border-top: 1px solid var(--border-subtle);
}

.tree-row {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 24px;
  padding: 0 12px;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  position: relative;
}
.tree-row:hover { background: var(--bg-hover); color: var(--text-primary); }
.tree-row.selected {
  background: var(--bg-active);
  color: var(--text-primary);
}
.tree-row.selected::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
}
.tree-row svg.icon-file { width: 14px; height: 14px; color: var(--text-secondary); }
.tree-row.dsol svg.icon-file { color: var(--accent); }
.tree-row .tree-mod-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-left: auto;
}
.tree-indent { display: inline-block; width: 12px; }

.empty-state {
  padding: 32px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: 1.5;
}
.empty-state svg {
  display: block;
  margin: 0 auto 16px;
  opacity: 0.5;
  color: var(--accent);
}
.empty-state .empty-cta {
  margin-top: 16px;
  display: inline-block;
}

.btn-primary {
  background: var(--accent);
  color: var(--text-inverse);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 120ms ease-out, box-shadow 120ms ease-out, transform 120ms ease-out;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-glow); }
.btn-primary:active { background: var(--accent-press); transform: translateY(0.5px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; box-shadow: none; }
.btn-primary svg { width: 14px; height: 14px; }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  font-size: var(--fs-sm);
  padding: 7px 14px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color 120ms ease-out, background 120ms ease-out;
}
.btn-secondary:hover { border-color: var(--accent); background: var(--bg-hover); }
.btn-secondary:active { background: var(--bg-popover); }
.btn-secondary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary svg { width: 14px; height: 14px; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-ghost:hover { color: var(--text-primary); background: var(--bg-hover); }

/* ───────────── Status bar ───────────── */

.statusbar {
  grid-area: statusbar;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
  font-size: var(--fs-xs);
  color: var(--text-secondary);
}

.status-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.status-item + .status-item::before {
  content: '';
  width: 1px;
  height: 12px;
  background: var(--border-subtle);
  margin-right: 12px;
}

.status-conn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}
.status-conn-dot.connected {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.status-spacer { flex: 1; }