:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #6c757d 0%, #495057 100%);
  --success-gradient: linear-gradient(135deg, #28a745 0%, #20c997 100%);
  --warning-gradient: linear-gradient(135deg, #ffc107 0%, #ff8c00 100%);
  --danger-gradient: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
}

body {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.dark-mode {
  --primary-gradient: linear-gradient(135deg, #2a2a2a 0%, #444444 100%);
  --secondary-gradient: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
  --warning-gradient: linear-gradient(135deg, #666666 0%, #888888 100%);
  background: #121212 !important;
  color: #E0E0E0;
}

.dark-mode .navbar-brand,
.dark-mode .nav-link,
.dark-mode .page-link,
.dark-mode .header-section h1,
.dark-mode .header-section h2,
.dark-mode .header-section h3,
.dark-mode h1,
.dark-mode h2,
.dark-mode h3,
.dark-mode h4,
.dark-mode h5,
.dark-mode h6,
.dark-mode p,
.dark-mode span,
.dark-mode label,
.dark-mode .form-label,
.dark-mode .table,
.dark-mode .card-title,
.dark-mode .card-description { color: #FFFFFF !important; }

.dark-mode .text-muted { color: #B0B0B0 !important; }

.dark-mode .header-section { background: #1e1e1e !important; border-color: #444444 !important; }
.dark-mode .header-section h1,
.dark-mode .header-section h2,
.dark-mode .header-section h3 { -webkit-text-fill-color: initial; -webkit-background-clip: initial; background-clip: initial; }
.dark-mode .hero-section h1,
.dark-mode .hero-section h2 { -webkit-text-fill-color: #FFFFFF !important; -webkit-background-clip: initial !important; background-clip: initial !important; background: none !important; color: #FFFFFF !important; }

/* Security box heading should be black for contrast on yellow background */
.dark-mode .security-box h6 { color: #000000 !important; }
.dark-mode .card { background: #1e1e1e !important; }
.dark-mode .management-card { background: #1e1e1e !important; color: #FFFFFF !important; }
.dark-mode .table thead th { color: #E0E0E0 !important; }
.dark-mode .table tbody td { color: #E0E0E0; border-bottom: 1px solid #444444; }
.dark-mode .table tbody tr:hover { background-color: #181818; }
.dark-mode .dataTables_info { color: #B0B0B0 !important; }
.dark-mode .page-link { border: 1px solid #444444; color: #E0E0E0; }
.dark-mode .page-link:hover { background-color: #2a2a2a; border-color: #444444; color: #E0E0E0; }
.dark-mode .page-item.active .page-link { background-color: #444444; border-color: #444444; }

.dark-mode .form-control,
.dark-mode .form-select { background-color: #121212; border-color: #444444; color: #FFFFFF; }
.dark-mode .form-control::placeholder,
.dark-mode .form-select::placeholder { color: #B0B0B0; }
.dark-mode .input-group-text { background-color: #1e1e1e; color: #FFFFFF; border-color: #444444; }

.dark-mode .table { background-color: #1e1e1e !important; color: #FFFFFF !important; }
.dark-mode .table thead th { background-color: #2a2a2a !important; color: #FFFFFF !important; border-bottom: 1px solid #444444 !important; }
.dark-mode .table-striped > tbody > tr:nth-of-type(odd) { background-color: #181818 !important; }
.dark-mode table.dataTable tbody tr { background-color: #1e1e1e !important; }
.dark-mode table.dataTable tbody tr:hover { background-color: #181818 !important; }
.dark-mode .dataTables_wrapper .dataTables_filter input,
.dark-mode .dataTables_wrapper .dataTables_length select { background-color: #121212 !important; border-color: #444444 !important; color: #FFFFFF !important; }
.dark-mode .dataTables_wrapper .dataTables_paginate .paginate_button { color: #FFFFFF !important; border: 1px solid #444444 !important; background: transparent !important; }
.dark-mode .dataTables_wrapper .dataTables_paginate .paginate_button.current { background: #2a2a2a !important; }
.dark-mode .table-container { background-color: #1e1e1e !important; border-color: #444444 !important; }

/* Admin page containers */
.dark-mode .main-card,
.dark-mode .hero-section,
.dark-mode .page-header { background-color: #1e1e1e !important; border-color: #444444 !important; box-shadow: none; }
.dark-mode .filters-section { background: #1e1e1e !important; border-color: #444444 !important; box-shadow: none; }
.dark-mode .search-card { background: #1e1e1e !important; border-color: #444444 !important; box-shadow: none; }
.dark-mode .main-card .card-body { background-color: transparent !important; }

/* Table cells and hover in dark mode */
.dark-mode .table tbody td { background-color: #1e1e1e !important; }
.dark-mode .table-hover tbody tr:hover { background-color: #181818 !important; }

/* DataTables controls specificity to override page styles */
.dark-mode .dataTables_wrapper .dataTables_length select { background-color: #121212 !important; border-color: #444444 !important; color: #FFFFFF !important; }
.dark-mode .dataTables_wrapper .dataTables_filter input { background-color: #121212 !important; border-color: #444444 !important; color: #FFFFFF !important; }

/* Batch actions panel */
.dark-mode .batch-actions { background: #1e1e1e !important; border-color: #444444 !important; }

/* Footer override */
.dark-mode footer.bg-white { background-color: #1e1e1e !important; border-top: 1px solid #444444 !important; }

/* Pagination buttons (Bootstrap/DataTables) */
.dark-mode .page-link { background-color: #1e1e1e !important; }
.dark-mode .dataTables_wrapper .dataTables_paginate { background: transparent !important; }
.dark-mode .table-responsive { background: #1e1e1e !important; box-shadow: none; }
.dark-mode .table-responsive::-webkit-scrollbar-track { background: #1e1e1e !important; }
.dark-mode .modal-content { background-color: #1e1e1e !important; color: #FFFFFF !important; }
.dark-mode .modal-body { background-color: #1e1e1e !important; color: #FFFFFF !important; }
.dark-mode .modal-footer { background-color: #1e1e1e !important; border-top: 1px solid #444444 !important; }
.dark-mode .form-text { color: #FFFFFF !important; }

/* QR panel: keep white background in dark mode for contrast */
.dark-mode .qr-container { background: #FFFFFF !important; border-color: #e9ecef !important; }

/* QR image background for visibility */
.dark-mode #qrImage,
.dark-mode #qrCode { background: #FFFFFF !important; padding: 12px !important; border-radius: 8px !important; }

/* Usuario perfil overrides */
.dark-mode .profile-header { background-color: #1e1e1e !important; border-color: #444444 !important; }
.dark-mode .profile-header h1 { color: #FFFFFF !important; background: none !important; -webkit-text-fill-color: #FFFFFF !important; }
.dark-mode .profile-info { color: #B0B0B0 !important; }
.dark-mode .modern-card { background-color: #1e1e1e !important; border-color: #444444 !important; }
.dark-mode .card-title { color: #FFFFFF !important; }
.dark-mode .info-box h6 { color: #000000 !important; }

/* HTML5-QR-Scanner overrides */
.dark-mode #qr-reader,
.dark-mode #qr-reader__dashboard,
.dark-mode #qr-reader__dashboard_section_csr { background: #1e1e1e !important; color: #FFFFFF !important; border-color: #444444 !important; }
.dark-mode #qr-reader__scan_region,
.dark-mode #qr-reader__header { background: #1e1e1e !important; border-color: #444444 !important; }
.dark-mode #qr-reader select,
.dark-mode #qr-reader input { background-color: #121212 !important; border-color: #444444 !important; color: #FFFFFF !important; }
.dark-mode #qr-reader button { background-color: #2a2a2a !important; color: #FFFFFF !important; border-color: #444444 !important; }
.dark-mode #qr-reader__status_span { color: #B0B0B0 !important; }

/* Instructions panel in scanner */
.dark-mode .instructions-box { background: #1e1e1e !important; border-color: #444444 !important; color: #FFFFFF !important; }
.dark-mode .instructions-box h6,
.dark-mode .instructions-box ul,
.dark-mode .instructions-box li,
.dark-mode .instructions-box .text-dark { color: #FFFFFF !important; }

/* SweetAlert2 dark mode */
.dark-mode .swal2-popup { background: #1e1e1e !important; color: #FFFFFF !important; }
.dark-mode .swal2-title,
.dark-mode .swal2-html-container { color: #FFFFFF !important; }
.dark-mode .swal2-confirm,
.dark-mode .swal2-cancel { background-color: #2a2a2a !important; color: #FFFFFF !important; border-color: #444444 !important; }
.dark-mode .swal2-timer-progress-bar { background: #444444 !important; }

/* Login page dark mode */
.dark-mode body { background: #121212 !important; }
.dark-mode .login-container { background: #1e1e1e !important; border: 1px solid #444444 !important; box-shadow: none !important; }
.dark-mode .login-title { color: #FFFFFF !important; background: none !important; -webkit-text-fill-color: #FFFFFF !important; }
.dark-mode .login-subtitle { color: #B0B0B0 !important; }
.dark-mode .nav-tabs { background: #1e1e1e !important; border-color: #444444 !important; }
.dark-mode .nav-tabs .nav-link { color: #B0B0B0 !important; }
.dark-mode .nav-tabs .nav-link:hover { background: #2a2a2a !important; color: #FFFFFF !important; }
.dark-mode .nav-tabs .nav-link.active { background: #2a2a2a !important; color: #FFFFFF !important; }
.dark-mode .nav-tabs .nav-link.active { box-shadow: none !important; }
.dark-mode .form-label { color: #FFFFFF !important; }
.dark-mode .form-control { background-color: #121212 !important; border-color: #444444 !important; color: #FFFFFF !important; }
.dark-mode .form-control::placeholder { color: #888888 !important; }
.dark-mode .btn-outline-secondary { background-color: #2a2a2a !important; color: #FFFFFF !important; border-color: #444444 !important; }
.dark-mode .login-info { border-top-color: #444444 !important; color: #B0B0B0 !important; }

.dark-mode .btn-warning,
.dark-mode .btn-gradient-warning { background: #888888 !important; border-color: #888888 !important; color: #FFFFFF !important; }
.dark-mode .btn-danger { background: linear-gradient(135deg, #aa2e3a 0%, #8a2430 100%) !important; border: none !important; color: #FFFFFF !important; }
.dark-mode .btn-info,
.dark-mode .btn-gradient-info { background: linear-gradient(135deg, #4e4e4e 0%, #5e5e5e 100%) !important; color: #FFFFFF !important; }

.navbar {
  background: var(--primary-gradient) !important;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  padding: 1rem 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.4rem;
  color: #fff !important;
}

.nav-link {
  color: rgba(255,255,255,0.9) !important;
  font-weight: 500;
  transition: all 0.3s ease;
  padding: 0.7rem 1rem !important;
  border-radius: 0.5rem;
  margin: 0 0.2rem;
}

.nav-link:hover {
  color: #fff !important;
  background: rgba(255,255,255,0.1);
  transform: translateY(-1px);
}

.nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,0.2) !important;
  font-weight: 600 !important;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.header-section {
  background: #fff !important;
  border-radius: 1.2rem;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  border: 3px solid transparent;
  background-clip: padding-box;
  position: relative;
}

.header-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--primary-gradient);
  margin: -3px;
  border-radius: inherit;
  z-index: -1;
}

.header-section h1,
.header-section h2,
.header-section h3 {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.card {
  border: none;
  border-radius: 1.2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.btn[disabled] { opacity: .7; }

.btn-gradient-primary {
  background: var(--primary-gradient);
  border: none;
  color: #fff !important;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 0.7rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102,126,234,0.3);
}

.btn-gradient-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102,126,234,0.4);
}

.btn-gradient-secondary {
  background: var(--secondary-gradient);
  border: none;
  color: #fff !important;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: 0.7rem;
  transition: all 0.3s ease;
}

.btn-gradient-secondary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(108,117,125,0.3);
}

.btn-gradient-success {
  background: var(--success-gradient);
  border: none;
  color: #fff !important;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 0.7rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(40,167,69,0.3);
}

.btn-gradient-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(40,167,69,0.4);
}

.btn-gradient-warning {
  background: var(--warning-gradient);
  border: none;
  color: #fff !important;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 0.7rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255,193,7,0.3);
}

.btn-gradient-warning:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255,193,7,0.4);
}

.btn-danger {
  background: var(--danger-gradient) !important;
  border: none !important;
  color: #fff !important;
}

.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(220,53,69,0.3);
}

.hero-section {
  background: #fff !important;
  border-radius: 1.2rem;
  padding: 3rem 2rem;
  margin-bottom: 3rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  border: 3px solid transparent;
  background-clip: padding-box;
  position: relative;
  text-align: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--primary-gradient);
  margin: -3px;
  border-radius: inherit;
  z-index: -1;
}

.nfc-card .card-body { padding: 2.5rem; text-align: center; }