/* ========================================================================
   App Layout v2 - Sidebar + Header + Page
   ======================================================================== */

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  background: var(--color-bg-subtle);
}

/* ---------- SIDEBAR ---------- */
.sidebar {
  background: white;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
}

.sidebar-brand {
  height: var(--header-height);
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 12px rgb(59 130 246 / 0.35);
}

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

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-section-title {
  font-size: 11px;
  font-weight: var(--font-semibold);
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-3) var(--space-3) var(--space-2);
  margin-top: var(--space-2);
}

.sidebar-section-title:first-child {
  margin-top: 0;
  padding-top: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
  cursor: pointer;
}

.nav-item:hover {
  background: var(--color-gray-100);
  color: var(--color-text);
}

.nav-item.active {
  background: var(--color-brand-50);
  color: var(--color-brand-700);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 18px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
}

.nav-item-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item-label { flex: 1; }

.nav-item-badge {
  background: var(--color-danger-500);
  color: white;
  font-size: 10px;
  font-weight: var(--font-bold);
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Promo card in sidebar */
.sidebar-promo {
  margin: var(--space-3);
  padding: var(--space-4);
  background: var(--gradient-brand);
  color: white;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.sidebar-promo::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
  height: 100px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
}

.sidebar-promo-icon {
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
  position: relative;
}

.sidebar-promo-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  margin-bottom: 2px;
  position: relative;
}

.sidebar-promo-desc {
  font-size: var(--text-xs);
  opacity: 0.85;
  margin-bottom: var(--space-3);
  position: relative;
}

.sidebar-promo-btn {
  background: white;
  color: var(--color-brand-700);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all var(--transition-fast);
}

.sidebar-promo-btn:hover {
  background: var(--color-brand-50);
  transform: translateY(-1px);
}

.sidebar-footer {
  padding: var(--space-3);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
  width: 100%;
  cursor: pointer;
}

.sidebar-user:hover { background: var(--color-gray-100); }

.sidebar-user-info {
  flex: 1;
  min-width: 0;
  text-align: left;
}

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

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

/* ---------- MAIN ---------- */
.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100vh;
}

/* ---------- HEADER ---------- */
.header {
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  gap: var(--space-4);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.header-search {
  flex: 1;
  max-width: 480px;
}

.header-search .input {
  background: var(--color-gray-100);
  border-color: transparent;
}

.header-search .input:focus {
  background: white;
  border-color: var(--color-brand-500);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  position: relative;
}

.header-icon-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-text);
}

.header-icon-btn .notification-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-danger-500);
  border: 2px solid white;
  border-radius: var(--radius-full);
}

.mobile-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.mobile-menu-btn:hover { background: var(--color-gray-100); }

/* ---------- PAGE ---------- */
.page {
  flex: 1;
  padding: var(--space-6) var(--space-8);
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
}

.page-header {
  margin-bottom: var(--space-6);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  letter-spacing: -0.025em;
  line-height: 1.2;
}

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

.page-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* ---------- BREADCRUMB ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-3);
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  margin-left: var(--space-2);
  color: var(--color-gray-300);
}

.breadcrumb a { transition: color var(--transition-fast); }
.breadcrumb a:hover { color: var(--color-brand-600); }
.breadcrumb-current { color: var(--color-text); font-weight: var(--font-medium); }

/* ---------- GRIDS ---------- */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.grid-cols-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.grid-cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.grid-cols-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }

@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
}

/* Asymmetric dashboard grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (max-width: 1024px) {
  .dashboard-grid { grid-template-columns: 1fr; }
}

/* Chart card */
.chart-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
}

.chart-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chart-card-title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

.chart-card-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.chart-legend {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.chart-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.chart-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

/* Responsive sidebar */
@media (max-width: 1024px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    width: 280px;
    z-index: var(--z-modal);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-2xl);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgb(15 23 42 / 0.5);
    backdrop-filter: blur(2px);
    z-index: calc(var(--z-modal) - 1);
  }
  .sidebar-overlay.open { display: block; }
  .mobile-menu-btn { display: flex; }
}

@media (max-width: 640px) {
  .page { padding: var(--space-4); }
  .header { padding: 0 var(--space-4); }
  .header-search { display: none; }
  .page-title { font-size: var(--text-2xl); }
}