/* ============================================
   MoneyBexX Layout System
   Grid, Containers, Navigation, and Responsive Utilities
   ============================================ */

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

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

.app-main {
  flex: 1;
  background: radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08), transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(91, 33, 182, 0.06), transparent 50%);
}

.app-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px;
}

.app-container-wide {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px 20px;
}

.app-container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 28px 20px;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(12px);
  background: rgba(249, 250, 251, 0.9);
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  max-width: 1100px;
  margin: 0 auto;
}

.nav-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--brand);
  text-decoration: none;
  margin-right: 2rem;
}

.nav-brand:hover {
  color: var(--brand2);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--r-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--textMuted);
  text-decoration: none;
  transition: background var(--transition-normal), color var(--transition-normal);
}

.nav-link:hover {
  color: var(--text);
  background: rgba(99, 102, 241, 0.08);
}

.nav-link.active {
  color: var(--text);
  background: var(--brandSoft);
  box-shadow: inset 0 0 0 1px var(--border);
}

/* Highlighted Nav Link (for key features like Simulator) */
.nav-link-highlight {
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: white !important;
  font-weight: 600;
}

.nav-link-highlight:hover {
  background: linear-gradient(135deg, var(--brand2), var(--brand));
  color: white !important;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.nav-link-highlight.active {
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: white !important;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

/* ============================================
   SIDEBAR LAYOUT
   ============================================ */

.layout-with-sidebar {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 80px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-nav-item {
  margin-bottom: 4px;
}

.sidebar-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 10px 12px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--textMuted);
  text-decoration: none;
  transition: background var(--transition-normal), color var(--transition-normal);
}

.sidebar-nav-link:hover {
  background: var(--surface2);
  color: var(--text);
}

.sidebar-nav-link.active {
  background: var(--brandSoft);
  color: var(--brand);
}

.sidebar-section-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--textMuted);
  margin: var(--spacing-md) 0 var(--spacing-sm) 0;
  padding: 0 12px;
}

/* ============================================
   PAGE HEADER
   ============================================ */

.page-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.page-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.page-title-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.page-subtitle {
  font-size: 16px;
  font-weight: 400;
  color: var(--textMuted);
  margin: 0;
}

/* ============================================
   GRID SYSTEMS
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Auto-fit Grid for Metrics */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

/* Two Column Layout */
.two-col-layout {
  display: grid;
  grid-template-columns: 1.4fr 1.1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

/* ============================================
   DASHBOARD SPECIFIC
   ============================================ */

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.dashboard-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.dashboard-section {
  margin-bottom: var(--spacing-xl);
}

.dashboard-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.section {
  margin-bottom: var(--spacing-2xl);
}

.section-header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.empty-state-icon {
  font-size: 48px;
  color: var(--textMuted);
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--spacing-sm);
}

.empty-state-text {
  font-size: 14px;
  color: var(--textMuted);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (≤ 840px) */
@media (max-width: 840px) {
  .app-container,
  .app-container-wide {
    padding: 20px 16px;
  }

  .layout-with-sidebar {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .two-col-layout {
    grid-template-columns: 1fr;
  }

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .page-header-top {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .dashboard-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .nav-menu.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    color: var(--text);
    border-top: 1px solid var(--border);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 16px;
    border-radius: var(--r-sm);
    background: transparent;
  }

  .nav-link:hover {
    background: var(--bgHover);
  }

  .nav-link.active {
    background: var(--brandSoft);
    color: var(--brand);
    font-weight: 600;
  }

  .nav-menu.mobile-open li {
    width: 100%;
  }
}

/* Mobile (≤ 600px) */
@media (max-width: 600px) {
  .app-container,
  .app-container-wide,
  .app-container-narrow {
    padding: 16px 12px;
  }

  .page-title {
    font-size: 32px;
  }

  .dashboard-title {
    font-size: 32px;
  }

  .metric-value {
    font-size: 24px;
  }

  .card-inner {
    padding: 16px;
  }

  .modal {
    max-width: 100%;
    margin: var(--spacing-sm);
  }

  .table th,
  .table td {
    padding: 8px 12px;
    font-size: 13px;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group .btn {
    width: 100%;
  }
}

/* Hide on Mobile */
@media (max-width: 600px) {
  .hide-mobile {
    display: none !important;
  }
}

/* Hide on Desktop */
@media (min-width: 601px) {
  .hide-desktop {
    display: none !important;
  }
}

/* ============================================
   UTILITIES
   ============================================ */

.sticky-top {
  position: sticky;
  top: 80px;
}

.overflow-hidden {
  overflow: hidden;
}

.overflow-auto {
  overflow: auto;
}

.scroll-y {
  overflow-y: auto;
}

.scroll-x {
  overflow-x: auto;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: var(--spacing-lg) 0;
}

.divider-vertical {
  width: 1px;
  background: var(--border);
  margin: 0 var(--spacing-lg);
}