:root {
            --primary: #00f3ff;
            --secondary: #9d4edd;
            --dark: #0a0a1a;
            --darker: #050510;
            --light: #e0f7fa;
            --glass: rgba(20, 20, 40, 0.7);
            --neon-glow: 0 0 10px var(--primary), 0 0 20px var(--primary), 0 0 30px var(--primary);
            --transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

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

        body {
            font-family: 'Exo 2', sans-serif;
            background-color: var(--darker);
            color: var(--light);
            min-height: 100vh;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(157, 78, 221, 0.15) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, rgba(0, 243, 255, 0.1) 0%, transparent 20%),
                linear-gradient(to bottom, var(--darker), var(--dark));
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Header */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            border-bottom: 1px solid rgba(0, 243, 255, 0.2);
            margin-bottom: 30px;
            position: relative;
        }

        header::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--primary), transparent);
            box-shadow: var(--neon-glow);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
            font-family: 'Orbitron', sans-serif;
        }

        .logo-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--neon-glow);
        }

        .logo-text {
            font-size: 1.8rem;
            font-weight: 900;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: 1px;
        }

        .subtitle {
            font-size: 0.9rem;
            opacity: 0.8;
            margin-top: -5px;
            letter-spacing: 2px;
        }

        /* Main Content */
        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        /* Glassmorphism Cards */
        .card {
            background: var(--glass);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 25px;
            border: 1px solid rgba(0, 243, 255, 0.1);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .card:hover {
            transform: translateY(-5px);
            border-color: rgba(0, 243, 255, 0.3);
            box-shadow: 0 12px 40px rgba(0, 243, 255, 0.1), var(--neon-glow);
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, transparent, rgba(0, 243, 255, 0.05), transparent);
            z-index: -1;
        }

        .card-title {
            font-family: 'Orbitron', sans-serif;
            font-size: 1.5rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--primary);
        }

        .card-title i {
            font-size: 1.3rem;
        }

        /* Form Elements */
        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--primary);
            font-size: 0.9rem;
            letter-spacing: 1px;
        }

        .form-control {
            width: 100%;
            padding: 15px;
            background: rgba(10, 15, 30, 0.7);
            border: 1px solid rgba(0, 243, 255, 0.2);
            border-radius: 10px;
            color: var(--light);
            font-family: 'Exo 2', sans-serif;
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
        }

        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }

        /* Buttons */
        .btn {
            padding: 15px 30px;
            border: none;
            border-radius: 10px;
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            letter-spacing: 1px;
        }

        .btn-primary {
            background: linear-gradient(45deg, var(--primary), #0099ff);
            color: var(--dark);
            box-shadow: 0 5px 15px rgba(0, 243, 255, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 243, 255, 0.5);
        }

        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-secondary:hover {
            background: rgba(0, 243, 255, 0.1);
            box-shadow: var(--neon-glow);
        }

        /* Search and Filter Section */
        .search-filter-container {
            margin-bottom: 30px;
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 20px;
            align-items: end;
        }

        @media (max-width: 768px) {
            .search-filter-container {
                grid-template-columns: 1fr;
            }
        }

        .search-box {
            position: relative;
        }

        .search-input {
            width: 100%;
            padding: 15px 15px 15px 50px;
            background: rgba(10, 15, 30, 0.7);
            border: 1px solid rgba(0, 243, 255, 0.2);
            border-radius: 10px;
            color: var(--light);
            font-family: 'Exo 2', sans-serif;
            font-size: 1rem;
            transition: var(--transition);
        }

        .search-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
        }

        .search-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary);
            font-size: 1.2rem;
        }

        .filter-options {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .filter-group {
            flex: 1;
            min-width: 150px;
        }

        .filter-select {
            width: 100%;
            padding: 15px;
            background: rgba(10, 15, 30, 0.7);
            border: 1px solid rgba(0, 243, 255, 0.2);
            border-radius: 10px;
            color: var(--light);
            font-family: 'Exo 2', sans-serif;
            font-size: 1rem;
            transition: var(--transition);
            cursor: pointer;
        }

        .filter-select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
        }

        .clear-filters {
            padding: 10px 20px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 10px;
            color: var(--light);
            font-family: 'Exo 2', sans-serif;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .clear-filters:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--primary);
        }

        /* Search Results Info */
        .search-results-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding: 15px;
            background: rgba(10, 15, 30, 0.5);
            border-radius: 10px;
            border-left: 4px solid var(--primary);
        }

        .results-count {
            font-family: 'Orbitron', sans-serif;
            font-size: 1.2rem;
            color: var(--primary);
        }

        .active-filters {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .filter-tag {
            background: rgba(0, 243, 255, 0.1);
            border: 1px solid rgba(0, 243, 255, 0.3);
            border-radius: 20px;
            padding: 5px 15px;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .filter-tag .remove-filter {
            background: none;
            border: none;
            color: var(--light);
            cursor: pointer;
            font-size: 0.8rem;
            transition: var(--transition);
        }

        .filter-tag .remove-filter:hover {
            color: #ff4757;
        }

        /* Lessons Display */
        .lessons-container {
            margin-top: 30px;
        }

        .lesson-item {
            background: rgba(15, 20, 40, 0.7);
            border-radius: 15px;
            padding: 20px;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .lesson-item:hover {
            transform: translateX(5px);
            background: rgba(20, 25, 50, 0.8);
        }

        .lesson-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.05), transparent);
            z-index: -1;
        }

        .lesson-source {
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .lesson-text {
            line-height: 1.6;
            margin-bottom: 10px;
        }

        .lesson-date {
            font-size: 0.8rem;
            opacity: 0.7;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .lesson-actions {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }

        .action-btn {
            background: transparent;
            border: none;
            color: var(--light);
            cursor: pointer;
            padding: 5px 10px;
            border-radius: 5px;
            transition: var(--transition);
            font-size: 0.9rem;
        }

        .action-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .delete-btn:hover {
            color: #ff4757;
        }

        /* No Results Message */
        .no-results {
            text-align: center;
            padding: 40px 20px;
            background: rgba(10, 15, 30, 0.5);
            border-radius: 15px;
            border: 2px dashed rgba(0, 243, 255, 0.3);
        }

        .no-results-icon {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
            opacity: 0.5;
        }

        /* Stats */
        .stats-container {
            display: flex;
            justify-content: space-around;
            margin-top: 30px;
            flex-wrap: wrap;
            gap: 20px;
        }

        .stat-card {
            background: var(--glass);
            border-radius: 15px;
            padding: 20px;
            text-align: center;
            min-width: 180px;
            border: 1px solid rgba(157, 78, 221, 0.2);
            transition: var(--transition);
        }

        .stat-card:hover {
            border-color: var(--secondary);
            box-shadow: 0 0 20px rgba(157, 78, 221, 0.3);
        }

        .stat-value {
            font-family: 'Orbitron', sans-serif;
            font-size: 2.5rem;
            font-weight: 700;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .stat-label {
            margin-top: 10px;
            font-size: 0.9rem;
            opacity: 0.8;
            letter-spacing: 1px;
        }

        /* Animations */
        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(0, 243, 255, 0.7); }
            70% { box-shadow: 0 0 0 10px rgba(0, 243, 255, 0); }
            100% { box-shadow: 0 0 0 0 rgba(0, 243, 255, 0); }
        }

        .pulse {
            animation: pulse 2s infinite;
        }

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

        .slide-in {
            animation: slideIn 0.3s ease-out;
        }

        /* Floating Elements */
        .floating-elements {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
        }

        .floating-element {
            position: absolute;
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: var(--neon-glow);
        }

        /* Responsive Adjustments */
        @media (max-width: 480px) {
            .container {
                padding: 15px;
            }
            
            .logo-text {
                font-size: 1.4rem;
            }
            
            .card {
                padding: 20px;
            }
            
            .btn {
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            
            .stat-card {
                min-width: 140px;
                padding: 15px;
            }
            
            .stat-value {
                font-size: 2rem;
            }
            
            .search-filter-container {
                grid-template-columns: 1fr;
            }
            
            .filter-options {
                flex-direction: column;
            }
            
            .search-results-info {
                flex-direction: column;
                gap: 15px;
                align-items: flex-start;
            }
        }
    
        @keyframes float {
            0% { transform: translate(0, 0) rotate(0deg); opacity: 0.7; }
            25% { transform: translate(10px, 10px) rotate(90deg); opacity: 0.9; }
            50% { transform: translate(-10px, 10px) rotate(180deg); opacity: 0.7; }
            75% { transform: translate(10px, -10px) rotate(270deg); opacity: 0.5; }
            100% { transform: translate(0, 0) rotate(360deg); opacity: 0.7; }
        }