/* ============================================
   LAYOUT — App Shell, Sidebar, Topbar, Pages
   ============================================ */

/* App shell */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ---- SIDEBAR ---- */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100vh;
  overflow-y: auto;
  transition: transform var(--transition), width var(--transition);
  z-index: 100;
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--navy-light);
  min-height: var(--topbar-h);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: var(--text-lg);
  font-weight: var(--weight-extra);
  color: var(--white);
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Nav */
.sidebar__nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  overflow-y: auto;
}

.nav-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-section__label {
  font-size: 0.65rem;
  font-weight: var(--weight-semi);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 var(--space-3);
  margin-bottom: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.65);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  user-select: none;
}

.nav-item:hover {
  background: var(--navy-light);
  color: var(--white);
}

.nav-item.active {
  background: var(--primary);
  color: var(--white);
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Sidebar user */
.sidebar__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-4);
  border-top: 1px solid var(--navy-light);
}

.user-info {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.user-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ---- MAIN ---- */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Topbar */
.topbar {
  height: var(--topbar-h);
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  flex-shrink: 0;
}

.topbar__left, .topbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.breadcrumb {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  color: var(--text-secondary);
}

.topbar-date {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: var(--weight-medium);
}

/* Pages */
.page-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-8) var(--space-8);
}

.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-8);
  gap: var(--space-4);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-extra);
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.page-subtitle {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: var(--weight-medium);
}

/* ---- DASHBOARD GRID ---- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

/* ---- SETTINGS GRID ---- */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

/* ---- TEAM GRID ---- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

/* ---- ONBOARDING GRID ---- */
.onboarding-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

/* ---- TRAINING GRID ---- */
.training-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-4);
}

/* Responsive */
@media (max-width: 1280px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
  .onboarding-grid { grid-template-columns: repeat(2, 1fr); }
  .training-grid { grid-template-columns: 1fr; }
  .settings-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --sidebar-w: 0px; }
  .sidebar { position: fixed; width: 256px; transform: translateX(-256px); }
  .sidebar.open { transform: translateX(0); }
  .page-content { padding: var(--space-5); }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .onboarding-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .settings-grid { grid-template-columns: 1fr; }
  .page-header { flex-direction: column; }
  .topbar { padding: 0 var(--space-4); }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
}