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

   body {
       font-family: 'Inter', sans-serif;
       overflow-x: hidden
   }

   h1,
   h2,
   h3,
   h4,
   h5,
   h6 {
       font-family: 'Plus Jakarta Sans', sans-serif
   }

   html,
   body {
       max-width: 100vw;
       overflow-x: hidden
   }

   ::-webkit-scrollbar {
       width: 6px;
       height: 6px
   }

   ::-webkit-scrollbar-track {
       background: transparent
   }

   ::-webkit-scrollbar-thumb {
       background: #94a3b8;
       border-radius: 3px
   }

   .dark ::-webkit-scrollbar-thumb {
       background: #475569
   }

   .glass {
       background: rgba(255, 255, 255, 0.85);
       backdrop-filter: blur(20px);
       -webkit-backdrop-filter: blur(20px);
       border: 1px solid rgba(255, 255, 255, 0.2)
   }

   .dark .glass {
       background: rgba(17, 24, 39, 0.9);
       border: 1px solid rgba(255, 255, 255, 0.05)
   }

   .glass-card {
       background: rgba(255, 255, 255, 0.95);
       backdrop-filter: blur(12px);
       border: 1px solid rgba(226, 232, 240, 0.8);
       box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05)
   }

   .dark .glass-card {
       background: rgba(30, 41, 59, 0.95);
       border: 1px solid rgba(255, 255, 255, 0.05)
   }

   .sidebar {
       transition: all .3s cubic-bezier(.4, 0, .2, 1)
   }

   .sidebar-overlay {
       background: rgba(0, 0, 0, 0.5);
       backdrop-filter: blur(4px)
   }

   @keyframes shimmer {
       0% {
           background-position: -200% 0
       }

       100% {
           background-position: 200% 0
       }
   }

   @keyframes fadeIn {
       from {
           opacity: 0
       }

       to {
           opacity: 1
       }
   }

   @keyframes scaleIn {
       from {
           opacity: 0;
           transform: scale(.95)
       }

       to {
           opacity: 1;
           transform: scale(1)
       }
   }

   @keyframes slideUp {
       from {
           opacity: 0;
           transform: translateY(20px)
       }

       to {
           opacity: 1;
           transform: translateY(0)
       }
   }

   .skeleton {
       background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
       background-size: 200% 100%;
       animation: shimmer 1.5s infinite
   }

   .dark .skeleton {
       background: linear-gradient(90deg, #1e293b 25%, #334155 50%, #1e293b 75%);
       background-size: 200% 100%
   }

   .animate-fadeIn {
       animation: fadeIn .3s ease
   }

   .animate-scaleIn {
       animation: scaleIn .3s ease
   }

   .animate-slideUp {
       animation: slideUp .4s ease
   }

   .hover-lift {
       transition: all .3s cubic-bezier(.4, 0, .2, 1)
   }

   .hover-lift:hover {
       transform: translateY(-4px);
       box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1)
   }

   .dark .hover-lift:hover {
       box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3)
   }

   .gradient-text {
       background: linear-gradient(135deg, #4F46E5, #7C3AED);
       -webkit-background-clip: text;
       -webkit-text-fill-color: transparent;
       background-clip: text
   }

   .nav-item.active {
       background: linear-gradient(135deg, #4F46E5, #7C3AED);
       color: white
   }

   .table-responsive {
       overflow-x: auto;
       -webkit-overflow-scrolling: touch
   }

   .icon-btn {
       display: flex;
       align-items: center;
       justify-content: center;
       width: 44px;
       height: 44px;
       min-width: 44px;
       min-height: 44px;
       border-radius: 12px;
       cursor: pointer;
       position: relative;
       z-index: 1;
       transition: all .2s;
       border: none;
       outline: none;
       -webkit-tap-highlight-color: transparent
   }

   .icon-btn:active {
       transform: scale(.92)
   }

   .icon-btn svg {
       pointer-events: none
   }

   .icon-btn .badge-dot {
       position: absolute;
       top: 8px;
       right: 8px;
       width: 9px;
       height: 9px;
       background: #EF4444;
       border-radius: 50%;
       border: 2px solid white
   }

   .dark .icon-btn .badge-dot {
       border-color: #111827
   }

   .slide-panel {
       position: fixed;
       top: 0;
       right: 0;
       height: 100%;
       height: 100dvh;
       z-index: 60;
       transform: translateX(100%);
       transition: transform .35s cubic-bezier(.4, 0, .2, 1);
       will-change: transform
   }

   .slide-panel.open {
       transform: translateX(0)
   }

   .panel-overlay {
       position: fixed;
       inset: 0;
       background: rgba(0, 0, 0, 0.4);
       backdrop-filter: blur(4px);
       z-index: 55;
       opacity: 0;
       pointer-events: none;
       transition: opacity .3s
   }

   .panel-overlay.active {
       opacity: 1;
       pointer-events: auto
   }

   @media(max-width:1023px) {
       .sidebar {
           transform: translateX(-100%);
           position: fixed;
           z-index: 50
       }

       .sidebar.open {
           transform: translateX(0)
       }
   }

   .dropdown-menu {
       position: absolute;
       right: 0;
       top: calc(100% + 8px);
       z-index: 50;
       opacity: 0;
       visibility: hidden;
       transform: translateY(-8px) scale(.97);
       transition: all .2s cubic-bezier(.4, 0, .2, 1)
   }

   .dropdown-menu.show {
       opacity: 1;
       visibility: visible;
       transform: translateY(0) scale(1)
   }

   .custom-checkbox {
       accent-color: #4F46E5;
       width: 16px;
       height: 16px;
       cursor: pointer;
       border-radius: 4px
   }

   .student-row {
       transition: all .2s
   }

   .student-row:hover {
       background: rgba(79, 70, 229, 0.03)
   }

   .dark .student-row:hover {
       background: rgba(79, 70, 229, 0.08)
   }

   .student-row.selected {
       background: rgba(79, 70, 229, 0.06);
       border-left: 3px solid #4F46E5
   }

   .dark .student-row.selected {
       background: rgba(79, 70, 229, 0.12)
   }

   .status-online {
       color: #10B981
   }

   .status-offline {
       color: #94a3b8
   }

   .tab-btn {
       transition: all .2s
   }

   .tab-btn.active {
       color: #4F46E5;
       border-bottom: 2px solid #4F46E5;
       font-weight: 600
   }

   @supports(padding-bottom:env(safe-area-inset-bottom)) {
       .mobile-safe {
           padding-bottom: env(safe-area-inset-bottom)
       }
   }

   .quick-action-btn {
       transition: all .2s
   }

   .quick-action-btn:hover {
       transform: scale(1.03)
   }

   .quick-action-btn:active {
       transform: scale(.97)
   }

   @media print {

       .sidebar,
       .top-nav,
       .no-print {
           display: none !important
       }

       .main-content {
           margin-left: 0 !important
       }
   }