:root {
  --school-primary: #075E46;
  --school-primary-hover: #064B39;
  --school-primary-dark: #043D2F;
  --school-mint: #E8FFF2;
  --school-bg: #F6FAF7;
  --school-surface: #FFFFFF;
  --school-border: #D7E8DE;
  --school-text: #19352B;
  --school-muted: #64776D;
  --school-success: #198754;
  --school-warning: #F0AD4E;
  --school-danger: #DC3545;
  --school-info: #0DCAF0;
  --sidebar-width: 260px;
  --topbar-height: 64px;
}

body {
  font-family: 'Sarabun', 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--school-bg);
  color: var(--school-text);
  min-height: 100vh;
  margin: 0;
  padding: 0;
}

/* Primary Button Styling */
.btn-primary {
  background-color: var(--school-primary);
  border-color: var(--school-primary);
  color: #FFFFFF;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
  background-color: var(--school-primary-hover) !important;
  border-color: var(--school-primary-hover) !important;
  color: #FFFFFF !important;
}

.btn-outline-primary {
  color: var(--school-primary);
  border-color: var(--school-primary);
}

.btn-outline-primary:hover {
  background-color: var(--school-primary);
  color: #FFFFFF;
}

/* Layout Architecture */
.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar styling (Forest Code) */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--school-primary);
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.3s ease;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 1030;
  overflow-y: auto;
}

.sidebar-header {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  background-color: var(--school-primary-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header .brand-icon {
  font-size: 1.5rem;
  color: var(--school-mint);
  margin-right: 0.75rem;
}

.sidebar-header .brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.2;
}

.sidebar-menu {
  list-style: none;
  padding: 1rem 0.75rem;
  margin: 0;
  flex-grow: 1;
}

.menu-heading {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: rgba(232, 255, 242, 0.6);
  letter-spacing: 0.05em;
  padding: 0.75rem 0.75rem 0.25rem 0.75rem;
}

.menu-item {
  margin-bottom: 0.25rem;
}

.menu-link {
  display: flex;
  align-items: center;
  padding: 0.625rem 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  border-radius: 0.375rem;
  font-size: 0.925rem;
  transition: all 0.2s ease;
}

.menu-link i {
  font-size: 1.15rem;
  width: 1.75rem;
  color: rgba(232, 255, 242, 0.8);
}

.menu-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
}

/* Active Menu styling: Mint Fog background and Forest Code text */
.menu-item.active .menu-link,
.menu-link.active {
  background-color: var(--school-mint);
  color: var(--school-primary);
  font-weight: 600;
}

.menu-item.active .menu-link i,
.menu-link.active i {
  color: var(--school-primary);
}

/* Main Content Area */
.app-main {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  margin-left: var(--sidebar-width);
  min-width: 0;
}

/* Top Navbar */
.app-topbar {
  height: var(--topbar-height);
  background-color: var(--school-surface);
  border-bottom: 1px solid var(--school-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1020;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* User Profile Badge */
.user-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.375rem;
  cursor: pointer;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--school-mint);
  color: var(--school-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

/* Page Container */
.app-content {
  padding: 1.5rem;
  flex-grow: 1;
}

/* Breadcrumb & Title */
.page-header {
  margin-bottom: 1.5rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--school-primary);
  margin-top: 0.25rem;
  margin-bottom: 0;
}

.breadcrumb {
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
}

.breadcrumb a {
  color: var(--school-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--school-primary);
}

.breadcrumb-item.active {
  color: var(--school-primary);
}

/* Cards */
.card {
  background-color: var(--school-surface);
  border: 1px solid var(--school-border);
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.card-header {
  background-color: transparent;
  border-bottom: 1px solid var(--school-border);
  padding: 1rem 1.25rem;
  font-weight: 600;
  color: var(--school-primary);
}

/* Tables */
.table {
  color: var(--school-text);
  border-color: var(--school-border);
}

.table th {
  background-color: #F8FCF9;
  color: var(--school-primary-dark);
  font-weight: 600;
  border-bottom: 2px solid var(--school-border);
  font-size: 0.875rem;
}

.table td {
  vertical-align: middle;
  font-size: 0.925rem;
}

.table-hover tbody tr:hover {
  background-color: rgba(232, 255, 242, 0.4);
}

/* Badges */
.badge-school-primary {
  background-color: var(--school-primary);
  color: #FFFFFF;
}

.badge-school-mint {
  background-color: var(--school-mint);
  color: var(--school-primary);
}

/* Stats Widget Card */
.stat-card {
  border-left: 4px solid var(--school-primary);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 0.5rem;
  background-color: var(--school-mint);
  color: var(--school-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

/* Footer */
.app-footer {
  background-color: var(--school-surface);
  border-top: 1px solid var(--school-border);
  padding: 1rem 1.5rem;
  font-size: 0.85rem;
  color: var(--school-muted);
}

/* Mobile Responsive */
@media (max-width: 991.98px) {
  .app-sidebar {
    transform: translateX(-100%);
  }

  .app-sidebar.show {
    transform: translateX(0);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
  }

  .app-main {
    margin-left: 0;
  }
}

/* ==========================================================================
   UI Animations & Transitions (Fade-In, Slide-Up, Micro-interactions)
   ========================================================================== */

/* Keyframe Definitions */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInSimple {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(6px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes slideDownFade {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Base Content Animation: Smooth Fade-In on Page Load (Without transform to preserve fixed modal stacking context) */
.app-content {
  animation: fadeInSimple 0.25s ease-out;
}

/* Animation Utility Classes */
.animate-fade-in,
.fade-in {
  animation: fadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-fade-in-simple {
  animation: fadeInSimple 0.3s ease forwards;
}

.animate-fade-in-scale,
.fade-in-scale {
  animation: fadeInScale 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-slide-down,
.slide-down {
  animation: slideDownFade 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Stagger Entrance Delays */
.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.10s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.20s; }
.stagger-5 { animation-delay: 0.25s; }

/* Enhanced Card Transitions & Hover Lift */
.card {
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.2s ease;
}

.card.hover-lift:hover,
.card-hover:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(7, 94, 70, 0.09) !important;
  border-color: rgba(7, 94, 70, 0.25);
}

/* Button Micro-interactions */
.btn {
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

/* Table Hover Row Animation */
.table-hover tbody tr {
  transition: background-color 0.18s ease;
}

/* Alert Notification Entrance */
.alert {
  animation: slideDownFade 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Modal & Backdrop Layering */
.modal {
  z-index: 1060 !important;
}

.modal-backdrop {
  z-index: 1050 !important;
}

/* Modal Smooth Entrance */
.modal.fade .modal-dialog {
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.28s ease !important;
  transform: scale(0.95) translateY(-12px);
  opacity: 0;
}

.modal.show .modal-dialog {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* Smooth Dropdown Menu */
.dropdown-menu {
  animation: fadeInScale 0.22s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  transform-origin: top right;
}

/* Badges Transition */
.badge {
  transition: transform 0.2s ease, background-color 0.2s ease;
}

/* Sidebar Menu Link hover */
.menu-link {
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.menu-link:hover {
  transform: translateX(3px);
}

/* Responsive Table Columns for iPad and Mobile (<= 1024px) */
@media (max-width: 1024px) {
  .col-account-number,
  .col-student-code {
    display: none !important;
  }
}

/* Savings Mobile Student Cards */
.savings-student-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.savings-student-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.08) !important;
  border-color: #a3cfbb !important;
}

/* Pagination Styling */
.pagination {
  margin-bottom: 0;
  gap: 2px;
}

.page-item .page-link {
  color: var(--school-primary);
  border-radius: 6px;
  border: 1px solid var(--school-border);
  padding: 0.35rem 0.65rem;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.page-item .page-link:hover {
  color: var(--school-primary-hover);
  background-color: var(--school-mint);
  border-color: var(--school-primary);
}

.page-item.active .page-link {
  background-color: var(--school-primary) !important;
  border-color: var(--school-primary) !important;
  color: #FFFFFF !important;
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(7, 94, 70, 0.25);
}

.page-item.disabled .page-link {
  color: var(--school-muted);
  background-color: #F8F9FA;
  border-color: #E9ECEF;
  opacity: 0.7;
}

/* Accessibility: Respect Reduced Motion Preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}