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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            color: #333;
        }

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

        .header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px 0;
        }

        .header h1 {
            color: white;
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .header p {
            color: rgba(255,255,255,0.9);
            font-size: 1.2rem;
            margin-bottom: 30px;
        }

        .admin-toggle {
            background: transparent;
            border: none;
            color: transparent;
            padding: 12px 24px;
            border-radius: 50px;
            cursor: default;
            font-size: 1rem;
            transition: all 0.3s ease;
            opacity: 0;
            position: relative;
        }

        .admin-toggle:hover {
            background: transparent;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .student-view {
            background: rgba(255,255,255,0.95);
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            backdrop-filter: blur(10px);
        }

        .admin-panel {
            display: none;
            background: rgba(255,255,255,0.95);
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            backdrop-filter: blur(10px);
        }

        .admin-panel.active {
            display: block;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 600;
            margin-bottom: 30px;
            color: #4a5568;
            text-align: center;
        }

        .test-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .test-zone {
            background: rgba(255,255,255,0.95);
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
            backdrop-filter: blur(10px);
        }

        .zone-header {
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid rgba(0,0,0,0.1);
        }

        .zone-title {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .zone-badge {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-radius: 50%;
        }

        .test-card {
            background: linear-gradient(135deg, var(--card-color, #667eea) 0%, var(--card-color-dark, #764ba2) 100%);
            border-radius: 15px;
            padding: 25px;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            position: relative;
            overflow: hidden;
        }

        .test-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .test-card:hover::before {
            opacity: 1;
        }

        .test-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.2);
        }

        .test-card h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .test-card p {
            color: rgba(255,255,255,0.9);
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .test-link {
            display: inline-block;
            background: rgba(255,255,255,0.2);
            color: white;
            text-decoration: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: 2px solid rgba(255,255,255,0.3);
            backdrop-filter: blur(10px);
        }

        .test-link:hover {
            background: rgba(255,255,255,0.3);
            transform: scale(1.05);
        }

        .admin-form {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #4a5568;
        }

        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus {
            outline: none;
            border-color: #667eea;
        }

        .btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 500;
            transition: all 0.3s ease;
            margin-right: 10px;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        .btn-danger {
            background: linear-gradient(135deg, #e53e3e 0%, #c53030 100%);
        }

        .test-list {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
        }

        .test-item {
            background: white;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

        .test-item-content {
            flex-grow: 1;
        }

        .test-item h4 {
            color: #4a5568;
            margin-bottom: 5px;
        }

        .test-item p {
            color: #718096;
            font-size: 0.9rem;
        }

        .test-item-actions {
            margin-left: 15px;
        }

        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: #718096;
        }

        .empty-state h3 {
            font-size: 1.5rem;
            margin-bottom: 10px;
        }

        .download-section {
            background: #e6f3ff;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 30px;
            border-left: 4px solid #667eea;
        }

        .download-section h3 {
            color: #4a5568;
            margin-bottom: 15px;
        }

        .download-section p {
            color: #718096;
            margin-bottom: 15px;
            line-height: 1.6;
        }

        .config-display {
            background: #f1f5f9;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            max-height: 200px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-break: break-all;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .test-grid {
                grid-template-columns: 1fr;
            }
            
            .test-item {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .test-item-actions {
                margin-left: 0;
                margin-top: 15px;
            }
        }

       

.config-panel {
    display: none;
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.config-panel.active {
    display: block;
}

.config-toggle {
    background: #4a5568;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 10px;
}

.config-toggle:hover {
    background: #2d3748;
}