/* ============================================================
   APP LAYOUT
   ============================================================ */

/* ── App Shell ───────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ── Top Navigation Bar ──────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 var(--space-4);
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border-default);
  box-shadow: var(--shadow-xs);
  z-index: var(--z-sticky);
  flex-shrink: 0;
  gap: var(--space-4);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-brand-600);
  letter-spacing: var(--letter-spacing-tight);
  text-decoration: none;
  flex-shrink: 0;
}

.topbar__brand-icon {
  width: 32px;
  height: 32px;
  background: var(--color-brand-500);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
}

.topbar__divider {
  width: 1px;
  height: 20px;
  background: var(--color-border-default);
  flex-shrink: 0;
}

.topbar__center {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── Toolbar ─────────────────────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border-default);
  flex-shrink: 0;
  overflow-x: auto;
}

.toolbar__group {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.toolbar__separator {
  width: 1px;
  height: 20px;
  background: var(--color-border-default);
  margin: 0 var(--space-2);
  flex-shrink: 0;
}

.toolbar__label {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  padding: 0 var(--space-1);
  flex-shrink: 0;
}

.toolbar__spacer { flex: 1; }

/* ── Content Area ────────────────────────────────────────────── */
.content-area {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ── Side Panel ──────────────────────────────────────────────── */
.side-panel {
  width: 300px;
  flex-shrink: 0;
  background: var(--color-bg-surface);
  border-right: 1px solid var(--color-border-default);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width var(--transition-slow);
}

.side-panel--right {
  border-right: none;
  border-left: 1px solid var(--color-border-default);
}

.side-panel.is-collapsed {
  width: 0;
  overflow: hidden;
}

.side-panel__header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-default);
  flex-shrink: 0;
}

.side-panel__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
}

.side-panel__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

/* ── Tree Viewport ───────────────────────────────────────────── */
.tree-viewport {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: var(--color-bg-app);
  background-image:
    radial-gradient(circle, var(--color-neutral-300) 1px, transparent 1px);
  background-size: 24px 24px;
  cursor: grab;
}

.tree-viewport:active { cursor: grabbing; }

.tree-canvas {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

/* ── Canvas Controls ─────────────────────────────────────────── */
.canvas-controls {
  position: absolute;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: var(--z-raised);
}

.canvas-controls__group {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.canvas-controls__group .btn {
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--color-border-default);
  width: 36px;
  height: 36px;
  padding: 0;
  color: var(--color-text-secondary);
}

.canvas-controls__group .btn:last-child { border-bottom: none; }
.canvas-controls__group .btn:hover {
  background: var(--color-neutral-100);
  color: var(--color-text-primary);
}


/* ── Status Bar ──────────────────────────────────────────────── */
.statusbar {
  height: 24px;
  background: var(--color-neutral-100);
  border-top: 1px solid var(--color-border-default);
  display: flex;
  align-items: center;
  padding: 0 var(--space-4);
  gap: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.statusbar__item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.statusbar__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

/* ── Empty State ─────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-12);
  text-align: center;
  height: 100%;
}

.empty-state__icon {
  font-size: 3rem;
  opacity: 0.3;
}

.empty-state__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.empty-state__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  max-width: 300px;
}

/* ── Person List (sidebar) ───────────────────────────────────── */
.person-list { display: flex; flex-direction: column; gap: var(--space-1); }

.person-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.person-list-item:hover   { background: var(--color-neutral-600); }
.person-list-item.is-selected { background: var(--color-neutral-500); }

.person-list-item__avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
  color: var(--color-neutral-0);
}

.person-list-item__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.person-list-item__meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* ── Detail Panel ────────────────────────────────────────────── */
.detail-section {
  margin-bottom: var(--space-5);
}

.detail-section__label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  margin-bottom: var(--space-2);
}

.detail-section__value {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
}

.detail-section__value--muted {
  color: var(--color-text-tertiary);
  font-style: italic;
}

/* ── Search Input ────────────────────────────────────────────── */
.search-input-wrapper {
  position: relative;
}

.search-input-wrapper .form-input {
  padding-left: calc(var(--space-3) + 20px + var(--space-2));
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

/* ── Tree Mode Selector (sidebar widget) ─────────────────────── */
.tree-mode-selector {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-default);
  background: var(--color-neutral-50);
}

.tree-mode-selector__label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  margin-bottom: var(--space-2);
}

.tree-mode-selector__options {
  display: flex;
  gap: var(--space-2);
}

.tree-mode-option {
  flex: 1;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border: 1.5px solid var(--color-border-default);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
}

.tree-mode-option:hover {
  border-color: var(--color-brand-400);
  color: var(--color-brand-600);
}

.tree-mode-option.is-active {
  background: var(--color-brand-500);
  border-color: var(--color-brand-500);
  color: #fff;
}

/* ── RTL Global Overrides ────────────────────────────────────── */
[dir="rtl"] .search-input-wrapper .form-input {
  padding-right: calc(var(--space-3) + 20px + var(--space-2));
  padding-left: var(--space-3);
}

[dir="rtl"] .search-icon {
  left: auto;
  right: var(--space-3);
}

[dir="rtl"] .side-panel {
  border-right: none;
  border-left: 1px solid var(--color-border-default);
}

[dir="rtl"] .side-panel--right {
  border-left: none;
  border-right: 1px solid var(--color-border-default);
}

[dir="rtl"] .toast-container {
  right: auto;
  left: var(--space-6);
}

[dir="rtl"] .statusbar {
  direction: rtl;
}

[dir="rtl"] .modal__footer {
  flex-direction: row-reverse;
}

[dir="rtl"] .form-select {
  background-position: left var(--space-3) center;
  padding-right: var(--space-3);
  padding-left: var(--space-8);
}