:root {
            --primary-color: #1e5f74;
            --secondary-color: #2d8a99;
            --success-color: #4caf50;
            --warning-color: #ff9800;
            --danger-color: #f44336;
            --light-color: #f0f8fa;
            --dark-color: #1a3a3f;
        }

        body {
            background: linear-gradient(135deg, var(--light-color) 0%, #e8f4f8 100%);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            min-height: 100vh;
        }

        /* ==================== NAVBAR ==================== */
        .navbar {
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 15px 0;
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
        }

        .nav-link {
            margin: 0 10px;
            transition: all 0.3s ease;
        }

        .nav-link:hover {
            color: #fff !important;
            transform: translateY(-2px);
        }

        .user-profile-btn {
            display: flex;
            align-items: center;
            gap: 10px;
            background: rgba(255,255,255,0.2);
            padding: 8px 15px;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .user-profile-btn:hover {
            background: rgba(255,255,255,0.3);
        }

        .user-avatar {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }

        /* ==================== SIDEBAR ==================== */
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.08);
            height: fit-content;
            position: sticky;
            top: 100px;
        }

        .sidebar-item {
            padding: 12px 15px;
            margin-bottom: 10px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
            color: #666;
            font-weight: 500;
            border-left: 3px solid transparent;
        }

        .sidebar-item:hover {
            background-color: var(--light-color);
            color: var(--primary-color);
            border-left-color: var(--primary-color);
        }

        .sidebar-item.active {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-left-color: white;
        }

        /* ==================== DASHBOARD CARDS ==================== */
        .dashboard-card {
            background: white;
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
        }

        .dashboard-card:hover {
            box-shadow: 0 5px 25px rgba(0,0,0,0.12);
            transform: translateY(-2px);
        }

        .card-icon {
            width: 60px;
            height: 60px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 15px;
        }

        .card-icon.primary {
            background: rgba(30, 95, 116, 0.1);
            color: var(--primary-color);
        }

        .card-icon.success {
            background: rgba(76, 175, 80, 0.1);
            color: var(--success-color);
        }

        .card-icon.warning {
            background: rgba(255, 152, 0, 0.1);
            color: var(--warning-color);
        }

        .card-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 10px;
        }

        .card-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .card-subtitle {
            font-size: 0.9rem;
            color: #999;
            margin-top: 5px;
        }

        /* ==================== QUESTION CARDS ==================== */
        .question-card {
            background: white;
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.08);
            border-right: 4px solid var(--primary-color);
            transition: all 0.3s ease;
        }

        .question-card:hover {
            box-shadow: 0 5px 25px rgba(0,0,0,0.12);
            transform: translateY(-2px);
        }

        .question-header {
            display: flex;
            justify-content: space-between;
            align-items: start;
            margin-bottom: 12px;
        }

        .question-title {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 1.15rem;
            flex: 1;
        }

        .status-badge {
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            white-space: nowrap;
        }

        .status-pending {
            background: #fff3cd;
            color: #856404;
        }

        .status-answered {
            background: #d4edda;
            color: #155724;
        }

        .status-closed {
            background: #f8d7da;
            color: #721c24;
        }

        .question-meta {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin-bottom: 12px;
            font-size: 0.9rem;
            color: #666;
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* ==================== FORM STYLES ==================== */
        .form-label {
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 8px;
        }

        .form-control, .form-select {
            border: 2px solid #ddd;
            border-radius: 8px;
            padding: 10px 15px;
            transition: all 0.3s ease;
        }

        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(30, 95, 116, 0.15);
        }

        .textarea-custom {
            min-height: 120px;
            resize: vertical;
        }

        /* ==================== BUTTONS ==================== */
        .btn-primary-custom {
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            border: none;
            color: white;
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .btn-primary-custom:hover {
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(30, 95, 116, 0.3);
        }

        .btn-outline-primary-custom {
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            background: white;
            font-weight: 600;
            padding: 10px 25px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .btn-outline-primary-custom:hover {
            background: var(--primary-color);
            color: white;
        }

        /* ==================== TABS ==================== */
        .nav-tabs {
            border-bottom: 2px solid #ddd;
            gap: 10px;
        }

        .nav-tabs .nav-link {
            color: #666;
            border: none;
            border-bottom: 3px solid transparent;
            padding: 12px 20px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .nav-tabs .nav-link:hover {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }

        .nav-tabs .nav-link.active {
            color: var(--primary-color);
            background: none;
            border-bottom-color: var(--primary-color);
        }

        /* ==================== MODAL ==================== */
        .modal-header {
            background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            border: none;
        }

        .modal-header .btn-close {
            filter: brightness(0) invert(1);
        }

        /* ==================== PAYMENT PAGE ==================== */
        .payment-container {
            background: white;
            border-radius: 15px;
            padding: 40px;
            box-shadow: 0 5px 30px rgba(0,0,0,0.1);
        }

        .payment-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .payment-header h2 {
            color: var(--dark-color);
            font-weight: 700;
            margin-bottom: 10px;
        }

        .payment-header p {
            color: #666;
            font-size: 1rem;
        }

        .payment-method-item {
            border: 2px solid #ddd;
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 15px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .payment-method-item:hover {
            border-color: var(--primary-color);
            background-color: var(--light-color);
        }

        .payment-method-item.active {
            border-color: var(--primary-color);
            background-color: var(--light-color);
        }

        .payment-method-icon {
            font-size: 2rem;
            width: 60px;
            height: 60px;
            border-radius: 10px;
            background: var(--light-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
        }

        .payment-summary {
            background: var(--light-color);
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 25px;
        }

        .summary-row {
            display: flex;
            justify-content: space-between;
            margin-bottom: 12px;
            font-size: 1rem;
        }

        .summary-row.total {
            border-top: 2px solid #ddd;
            padding-top: 12px;
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.3rem;
        }

        /* ==================== TABLES ==================== */
        .table-custom {
            border-collapse: collapse;
            width: 100%;
        }

        .table-custom thead {
            background: var(--light-color);
            color: var(--dark-color);
        }

        .table-custom th {
            padding: 15px;
            font-weight: 600;
            text-align: right;
            border: none;
        }

        .table-custom td {
            padding: 15px;
            border-bottom: 1px solid #eee;
        }

        .table-custom tbody tr:hover {
            background-color: var(--light-color);
        }

        /* ==================== FOOTER ==================== */
        footer {
            background: var(--primary-color);
            color: white;
            padding: 30px 0;
            margin-top: 50px;
        }

        /* ==================== ALERTS ==================== */
        .alert-custom {
            border-radius: 10px;
            padding: 15px 20px;
            margin-bottom: 20px;
            border: none;
        }

        .alert-success-custom {
            background-color: #d4edda;
            color: #155724;
            border-left: 4px solid #28a745;
        }

        .alert-warning-custom {
            background-color: #fff3cd;
            color: #856404;
            border-left: 4px solid #ffc107;
        }

        .alert-info-custom {
            background-color: #d1ecf1;
            color: #0c5460;
            border-left: 4px solid #17a2b8;
        }

        /* ==================== RESPONSIVE ==================== */
        @media (max-width: 768px) {
            .sidebar {
                position: relative;
                top: 0;
                margin-bottom: 30px;
            }

            .payment-container {
                padding: 20px;
            }

            .question-header {
                flex-direction: column;
                gap: 10px;
            }

            .question-meta {
                font-size: 0.85rem;
            }
        }

        /* ==================== HIDDEN CONTENT ==================== */
        /* .content-section {
            display: none;
        } */

        .content-section.active {
            display: block;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }