.app {
  display: flex;
  min-height: 100vh;
}

.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-width: 0;
  transition: margin-left var(--transition);
  display: flex;
  flex-direction: column;
}

.sidebar-collapsed .main-wrapper {
  margin-left: var(--sidebar-collapsed-width);
}

.main-content {
  flex: 1;
  padding: 24px;
  overflow: auto;
}

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.charts-grid .span2 { grid-column: span 2; }

/* Page section */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Flash messages */
.flash {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
}
.flash.alert { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: #fca5a5; }
.flash.notice { background: rgba(16,185,129,0.15); border: 1px solid rgba(16,185,129,0.3); color: #6ee7b7; }