:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --sidebar-width: 250px;
  --transition-speed: 0.3s;
  --primary-color: #667eea;
  --danger-color: #dc3545;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background-color: #f8f9fa;
  overflow-x: hidden;
}

/* Sidebar Styles */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: var(--sidebar-width);
  background: var(--primary-gradient);
  padding: 20px;
  color: white;
  overflow-y: auto;
  transition: all var(--transition-speed) ease;
  z-index: 1000;
}

.sidebar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 30px;
  text-align: center;
  padding: 10px;
}

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

.sidebar-menu li {
  margin-bottom: 5px;
}

.sidebar-menu a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  display: flex;
  align-items: center;
  padding: 12px 15px;
  border-radius: 8px;
  transition: all 0.25s ease;
  font-size: 0.95rem;
}

.sidebar-menu a:hover {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  transform: translateX(5px);
}

.sidebar-menu a.active {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  font-weight: 600;
}

.sidebar-menu i {
  margin-right: 12px;
  font-size: 1.2rem;
  width: 24px;
  text-align: center;
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  padding: 30px;
  min-height: 100vh;
  transition: margin-left var(--transition-speed) ease;
}

/* Top Bar */
.top-bar {
  background: white;
  padding: 25px 30px;
  border-radius: 12px;
  margin-bottom: 30px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: slideDown 0.4s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.top-bar h3 {
  margin: 0;
  font-size: 1.75rem;
  color: #2c3e50;
}

.top-bar p {
  margin: 5px 0 0 0;
  color: #6c757d;
}

/* Actions Bar */
.actions-bar {
  background: white;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-box i {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: #6c757d;
}

.search-box input {
  width: 100%;
  padding: 10px 15px 10px 45px;
  border: 2px solid #e9ecef;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Cards */
.card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  border: none;
  overflow: hidden;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.table {
  margin: 0;
}

.table thead {
  background: #f8f9fa;
}

.table thead th {
  font-weight: 600;
  color: #2c3e50;
  border-bottom: 2px solid #e9ecef;
  padding: 15px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.table tbody td {
  padding: 15px;
  vertical-align: middle;
  color: #495057;
}

.table tbody tr {
  transition: background-color 0.2s ease;
}

.table tbody tr:hover {
  background-color: #f8f9fa;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--primary-gradient);
  border: none;
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
  background: #6c757d;
  border: none;
  color: white;
}

.btn-success {
  background: var(--success-color);
  border: none;
  color: white;
}

.btn-danger {
  background: var(--danger-color);
  border: none;
  color: white;
}

.btn-warning {
  background: var(--warning-color);
  border: none;
  color: #212529;
}

.btn-info {
  background: var(--info-color);
  border: none;
  color: white;
}

.btn-logout {
  background: #dc3545;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-logout:hover {
  background: #c82333;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
}

/* Badges */
.badge {
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.75rem;
}

.badge-success {
  background: #d4edda;
  color: #155724;
}

.badge-danger {
  background: #f8d7da;
  color: #721c24;
}

.badge-warning {
  background: #fff3cd;
  color: #856404;
}

.badge-info {
  background: #d1ecf1;
  color: #0c5460;
}

/* Loading Animation */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(102, 126, 234, 0.3);
  border-radius: 50%;
  border-top-color: #667eea;
  animation: spin 0.8s linear infinite;
  margin-right: 10px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Form Controls */
.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-check-input:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

/* Modal Enhancements */
.modal-content {
  border-radius: 12px;
  border: none;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
  background: var(--primary-gradient);
  color: white;
  border-radius: 12px 12px 0 0;
  padding: 20px 25px;
}

.modal-header .btn-close {
  filter: brightness(0) invert(1);
}

.modal-body {
  padding: 25px;
}

.modal-footer {
  padding: 20px 25px;
  border-top: 1px solid #e9ecef;
}

/* Responsive Design */

/* Mobile First - Base Styles */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 280px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
  }

  .sidebar.active {
    transform: translateX(0);
  }

  /* Backdrop for mobile menu */
  .sidebar.active::before {
    content: '';
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: -1;
  }

  .main-content {
    margin-left: 0;
    padding: 15px;
  }

  /* Mobile Menu Toggle Button */
  .mobile-menu-toggle {
    display: block;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1001;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }

  .mobile-menu-toggle:focus-visible {
    outline: 2px solid white;
    outline-offset: 2px;
  }

  .top-bar {
    flex-direction: column;
    gap: 15px;
    margin-top: 50px;
    padding: 15px;
  }

  .top-bar h1 {
    font-size: 1.5rem;
  }

  .actions-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .search-box {
    max-width: 100%;
  }

  /* Table Responsive */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 600px;
  }

  /* Cards Stack on Mobile */
  .stats-grid {
    grid-template-columns: 1fr !important;
  }

  /* Modal Adjustments */
  .modal-dialog {
    margin: 10px;
  }

  .modal-content {
    max-height: calc(100vh - 20px);
    overflow-y: auto;
  }

  /* Form Elements Full Width */
  .form-control,
  .btn {
    font-size: 16px; /* Prevent iOS zoom */
  }

  /* Hide certain columns on mobile */
  .hide-mobile {
    display: none !important;
  }
}

/* Tablet Styles */
@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --sidebar-width: 220px;
  }

  .sidebar {
    width: 220px;
    padding: 15px;
  }

  .sidebar-brand {
    font-size: 1.3rem;
  }

  .sidebar-menu a {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .main-content {
    padding: 20px;
  }

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

  .mobile-menu-toggle {
    display: none;
  }
}

/* Desktop Styles */
@media (min-width: 1025px) {
  .mobile-menu-toggle {
    display: none;
  }

  .sidebar {
    width: var(--sidebar-width);
  }

  /* Larger cards grid */
  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

/* Large Desktop */
@media (min-width: 1400px) {
  :root {
    --sidebar-width: 280px;
  }

  .container-large {
    max-width: 1320px;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-3 {
  margin-top: 1rem;
}

.mb-3 {
  margin-bottom: 1rem;
}

.p-3 {
  padding: 1rem;
}

/* Section Headings */
.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2c3e50;
  margin: 40px 0 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-heading::after {
  content: "";
  flex: 1;
  height: 2px;
  background: linear-gradient(to right, #667eea, transparent);
}