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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background-color: #0a0a0a;
            color: #e5e7eb;
            line-height: 1.6;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
        }

        /* Header */
        .header {
            margin-bottom: 2rem;
        }

        .header-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .header-title h1 {
            font-size: 2.5rem;
            font-weight: bold;
            color: white;
        }

        .header-subtitle {
            color: #9ca3af;
            margin-bottom: 1.5rem;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }

        .stat-card {
            background: #111827;
            border: 1px solid #374151;
            border-radius: 0.75rem;
            padding: 1.5rem;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 0.875rem;
            color: #9ca3af;
        }

        .stat-blue { color: #60a5fa; }
        .stat-green { color: #34d399; }
        .stat-yellow { color: #fbbf24; }
        .stat-purple { color: #a78bfa; }

        /* Filters */
        .filters {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .search-container {
            position: relative;
            flex: 1;
            min-width: 300px;
        }

        .search-input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 3rem;
            background: #111827;
            border: 1px solid #374151;
            border-radius: 0.5rem;
            color: white;
            font-size: 1rem;
        }

        .search-input:focus {
            outline: none;
            border-color: #3b82f6;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        .search-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: #9ca3af;
        }

        .filter-select {
            padding: 0.75rem 1rem;
            background: #111827;
            border: 1px solid #374151;
            border-radius: 0.5rem;
            color: white;
            font-size: 1rem;
        }

        .filter-select:focus {
            outline: none;
            border-color: #3b82f6;
        }

        /* Table */
        .table-container {
            background: #111827;
            border: 1px solid #374151;
            border-radius: 0.75rem;
            overflow: hidden;
        }

        .table {
            width: 100%;
            border-collapse: collapse;
        }

        .table thead {
            background: #1f2937;
            border-bottom: 1px solid #374151;
        }

        .table th {
            padding: 1rem;
            text-align: left;
            font-weight: 600;
            color: #e5e7eb;
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.025em;
        }

        .table th.text-center {
            text-align: center;
        }

        .table td {
            padding: 1rem;
            border-bottom: 1px solid #374151;
        }

        .table tbody tr:hover {
            background: rgba(55, 65, 81, 0.3);
            transition: background-color 0.2s;
        }

        .table tbody tr:last-child td {
            border-bottom: none;
        }

        /* Student Info */
        .student-name {
            font-weight: 600;
            color: white;
            margin-bottom: 0.25rem;
        }

        .student-activities {
            font-size: 0.875rem;
            color: #9ca3af;
            margin-bottom: 0.5rem;
        }

        .student-observation {
            font-size: 0.75rem;
            color: #6b7280;
            max-width: 300px;
            line-height: 1.4;
        }

        /* Technology Badges */
        .tech-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2rem;
            height: 2rem;
            border-radius: 50%;
            font-weight: 600;
            font-size: 0.875rem;
        }

        .tech-html { background: rgba(147, 51, 234, 0.2); color: #a78bfa; }
        .tech-js { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
        .tech-react { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
        .tech-node { background: rgba(34, 197, 94, 0.2); color: #34d399; }
        .tech-git { background: rgba(107, 114, 128, 0.2); color: #9ca3af; }

        /* Grade Badge */
        .grade-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 4rem;
            height: 2rem;
            border-radius: 9999px;
            border: 2px solid;
            font-weight: bold;
            font-size: 0.875rem;
        }

        .grade-excellent { 
            background: rgba(34, 197, 94, 0.1); 
            border-color: #16a34a; 
            color: #34d399; 
        }

        .grade-good { 
            background: rgba(245, 158, 11, 0.1); 
            border-color: #d97706; 
            color: #fbbf24; 
        }

        .grade-average { 
            background: rgba(249, 115, 22, 0.1); 
            border-color: #ea580c; 
            color: #fb923c; 
        }

        .grade-low { 
            background: rgba(239, 68, 68, 0.1); 
            border-color: #dc2626; 
            color: #f87171; 
        }

        /* Legend */
        .legend {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin-top: 2rem;
        }

        .legend-card {
            background: #111827;
            border: 1px solid #374151;
            border-radius: 0.75rem;
            padding: 1.5rem;
        }

        .legend-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .legend-text {
            font-size: 0.875rem;
            color: #9ca3af;
        }

        /* Footer */
        .footer {
            text-align: center;
            margin-top: 2rem;
            color: #6b7280;
            font-size: 0.875rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }

            .header-title h1 {
                font-size: 2rem;
            }

            .filters {
                flex-direction: column;
            }

            .search-container {
                min-width: unset;
            }

            .table-container {
                overflow-x: auto;
            }

            .table {
                min-width: 800px;
            }

            .student-observation {
                max-width: 200px;
            }
        }

        .hidden {
            display: none;
        }

        .tech-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .react-badge {
            width: 1rem;
            height: 1rem;
            background: #3b82f6;
            color: white;
            border-radius: 0.25rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.625rem;
            font-weight: bold;
        }