:root {
            --bg-color: #f4f6f8;
            --card-bg: #ffffff;
            --text-color: #333333;
            --text-muted: #666666;
            --border-color: #e1e4e8;
            --primary-color: #4f46e5;
            --primary-hover: #4338ca;
            --success-color: #16a34a;
            --error-color: #dc2626;
        }

        body {
            font-family: system-ui, -apple-system, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            margin-top: 100px;
            margin-bottom: 100px;
            padding: 40px 20px;
            display: column;
            justify-content: center;
        }

        .profile-card {
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            width: 100%;
            max-width: 500px;
            padding: 32px;
        }
        
        table.menu td {
            text-align: center;
        }

        table.menu {
            position: fixed;
            top: 0;
            left: 0;
            z-index: 9999;
            height: 100px;
            width: 100%;
        }
        
        h1 {
            margin-top: 0;
            font-size: 1.5rem;
            color: #111827;
        }

        .alert {
            padding: 12px;
            border-radius: 6px;
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        .alert-success { background-color: #dcfce7; color: var(--success-color); }
        .alert-error { background-color: #fee2e2; color: var(--error-color); }

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

        label {
            display: block;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        input[type="text"],
        input[type="email"],
        input[type="url"],
        input[type="date"] {
            width: 100%;
            padding: 10px 12px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            box-sizing: border-box;
        }

        input:disabled {
            background-color: #f3f4f6;
            color: var(--text-muted);
            cursor: not-allowed;
        }

        .helper-text {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            background: #f9fafb;
            padding: 16px;
            border-radius: 8px;
            margin-bottom: 24px;
            border: 1px solid var(--border-color);
        }

        .stat-item {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .stat-value {
            display: block;
            font-size: 1.1rem;
            font-weight: 700;
            color: #111827;
            margin-top: 2px;
        }

        button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 12px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        button:hover {
            background-color: var(--primary-hover);
        }
        
        .coinbox {
            width="100px";
            height="100px";
            position: fixed;
            bottom: 0;
            right: 0;
            z-index: 9998;
        }

        .container { max-width: 900px; margin: 0 auto; background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
        .header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; border-bottom: 2px solid #eee; padding-bottom: 15px; }
        h1 { color: #2c3e50; margin: 0; }
        .btn { padding: 10px 18px; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; font-size: 14px; text-decoration: none; display: inline-block; }
        .btn-primary { background: #3b82f6; color: white; }
        .btn-secondary { background: #6b7280; color: white; }
        .btn-sm { padding: 6px 12px; font-size: 13px; }
        
        .course-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
        .course-card { background: #fafafa; border: 1px solid #e2e8f0; border-radius: 8px; padding: 20px; display: flex; justify-content: space-between; align-items: flex-start; }
        .course-info { flex-grow: 1; padding-right: 20px; }
        .course-title { font-size: 18px; font-weight: bold; color: #1e293b; margin-bottom: 6px; }
        .course-desc { color: #64748b; font-size: 14px; margin-bottom: 12px; line-height: 1.4; }
        .course-meta { font-size: 12px; color: #94a3b8; display: flex; gap: 15px; }
        .badge { padding: 3px 8px; border-radius: 12px; font-weight: bold; font-size: 11px; }
        .badge-active { background: #d1fae5; color: #065f46; }
        .badge-expired { background: #fee2e2; color: #991b1b; }
        
        .actions { display: flex; gap: 8px; flex-shrink: 0; }
        .empty-state { text-align: center; padding: 40px; color: #64748b; }
        .container { max-width: 800px; margin: 0 auto; background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
        h1, h2 { color: #2c3e50; margin-top: 0; }
        .form-group { margin-bottom: 20px; }
        label { display: block; font-weight: 600; margin-bottom: 6px; }
        input[type="text"], input[type="date"], textarea, select {
            width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; box-sizing: border-box; font-size: 14px;
        }
        textarea { resize: vertical; height: 80px; }
        
        /* Lessons Section */
        .lessons-header { display: flex; justify-content: space-between; align-items: center; margin-top: 30px; border-bottom: 2px solid #eee; padding-bottom: 10px; }
        .lesson-card { background: #fafafa; border: 1px solid #e2e8f0; border-radius: 6px; padding: 15px; margin-bottom: 15px; position: relative; }
        .lesson-card .card-header { display: flex; justify-content: space-between; align-items: center; font-weight: bold; margin-bottom: 10px; cursor: pointer; }
        .btn { padding: 8px 16px; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; font-size: 14px; }
        .btn-primary { background: #3b82f6; color: white; }
        .btn-secondary { background: #10b981; color: white; }
        .btn-danger { background: #ef4444; color: white; padding: 4px 10px; font-size: 12px; }
        .alert { padding: 12px; border-radius: 6px; margin-bottom: 20px; }
        .alert-success { background: #d1fae5; color: #065f46; }
        .alert-error { background: #fee2e2; color: #991b1b; }
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }