:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
            --danger-gradient: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
            --warning-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            --glass-bg: rgba(255, 255, 255, 0.25);
            --glass-border: rgba(255, 255, 255, 0.18);
            --shadow-light: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
            --shadow-heavy: 0 20px 60px 0 rgba(31, 38, 135, 0.5);
            --text-primary: #2d3748;
            --text-secondary: #4a5568;
            --border-radius: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
            background-size: 400% 400%;
            animation: gradientShift 15s ease infinite;
            min-height: 100vh;
            margin: 0;
            padding: 0;
            position: relative;
            overflow-x: hidden;
        }

        @keyframes gradientShift {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        /* Floating particles background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(120, 119, 198, 0.2) 0%, transparent 50%);
            pointer-events: none;
            z-index: -1;
        }

        /* Navigation */
        .payment-navbar {
            background: var(--glass-bg) !important;
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--glass-border);
            box-shadow: var(--shadow-light);
        }

        /* Main Container */
        .payment-container {
            max-width: 800px;
            margin: 2rem auto;
            padding: 0 1rem;
            position: relative;
        }

        /* Payment Card */
        .payment-card {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-heavy);
            overflow: hidden;
            animation: slideUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
            margin-bottom: 2rem;
            position: relative;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(50px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        /* Payment Header */
        .payment-header {
            background: var(--primary-gradient);
            color: white;
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .payment-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: conic-gradient(from 0deg, transparent, rgba(255,255,255,0.1), transparent);
            animation: rotate 4s linear infinite;
        }

        @keyframes rotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .payment-header h1 {
            margin: 0;
            font-size: 2.5rem;
            font-weight: 800;
            position: relative;
            z-index: 1;
            text-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }

        .payment-header p {
            margin: 1rem 0 0 0;
            opacity: 0.95;
            font-size: 1.2rem;
            position: relative;
            z-index: 1;
            font-weight: 400;
        }

        /* Payment Body */
        .payment-body {
            padding: 3rem;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
        }

        /* Form Groups */
        .form-group {
            margin-bottom: 2.5rem;
        }

        .form-label {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
            display: block;
            font-size: 1.1rem;
        }

        .form-control, .form-select {
            border: 2px solid rgba(102, 126, 234, 0.1);
            border-radius: 15px;
            padding: 1rem 1.5rem;
            font-size: 1rem;
            transition: var(--transition);
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            font-weight: 500;
        }

        .form-control:focus, .form-select:focus {
            border-color: #667eea;
            box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.15);
            background: rgba(255, 255, 255, 0.95);
            transform: translateY(-2px);
        }

        /* Amount Input */
        .amount-input {
            font-size: 1.5rem;
            font-weight: 700;
            text-align: center;
            color: #667eea;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
        }

        .input-group-text {
            background: var(--primary-gradient);
            border: none;
            color: white;
            font-weight: 700;
            font-size: 1.2rem;
            border-radius: 15px 0 0 15px;
        }

        /* Package Info */
        .package-info {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            border-radius: 15px;
            padding: 2rem;
            margin-top: 1.5rem;
            display: none;
            border: 1px solid rgba(102, 126, 234, 0.2);
            position: relative;
            overflow: hidden;
        }

        .package-info::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--primary-gradient);
        }

        .package-info.show {
            display: block;
            animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        /* Customer Section */
        .customer-section {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(248, 249, 250, 0.8) 100%);
            border-radius: 20px;
            padding: 2.5rem;
            margin: 3rem 0;
            border: 1px solid rgba(102, 126, 234, 0.1);
            backdrop-filter: blur(10px);
        }

        .section-title {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid transparent;
            background: var(--primary-gradient);
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--primary-gradient);
            border-radius: 2px;
        }

        /* Amount Display */
        .amount-display {
            background: var(--success-gradient);
            color: white;
            border-radius: 20px;
            padding: 3rem 2rem;
            text-align: center;
            margin: 3rem 0;
            position: relative;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(17, 153, 142, 0.3);
        }

        .amount-display::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, transparent, rgba(255,255,255,0.2), transparent);
            border-radius: 20px;
            animation: borderGlow 3s linear infinite;
        }

        @keyframes borderGlow {
            0% { transform: translateX(-100%) rotate(0deg); }
            100% { transform: translateX(100%) rotate(360deg); }
        }

        .amount-value {
            font-size: 3.5rem;
            font-weight: 800;
            position: relative;
            z-index: 1;
            text-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }

        .currency {
            font-size: 2.5rem;
            opacity: 0.9;
        }

        .amount-label {
            font-size: 1.1rem;
            opacity: 0.95;
            margin-top: 0.5rem;
            position: relative;
            z-index: 1;
            font-weight: 500;
        }

        /* Pay Button */
        .pay-button {
            background: var(--success-gradient);
            border: none;
            border-radius: 50px;
            color: white;
            font-size: 1.4rem;
            font-weight: 700;
            padding: 1.5rem 3rem;
            width: 100%;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            cursor: pointer;
            box-shadow: 0 10px 30px rgba(17, 153, 142, 0.4);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .pay-button:hover:not(:disabled) {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(17, 153, 142, 0.5);
            color: white;
        }

        .pay-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
            transition: left 0.6s;
        }

        .pay-button:hover::before {
            left: 100%;
        }

        /* Security Badges */
        .security-badges {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 3rem;
        }

        .security-badge {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.75rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 600;
            padding: 1rem 1.5rem;
            background: rgba(255, 255, 255, 0.8);
            border-radius: 15px;
            transition: var(--transition);
            border: 1px solid rgba(102, 126, 234, 0.1);
            backdrop-filter: blur(10px);
        }

        .security-badge:hover {
            background: rgba(255, 255, 255, 0.95);
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }

        .security-badge i {
            color: #11998e;
            font-size: 1.2rem;
        }

        /* Help Section */
        .help-section {
            margin-top: 3rem;
        }

        .help-card {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: var(--border-radius);
            padding: 2.5rem;
            text-align: center;
            box-shadow: var(--shadow-light);
            position: relative;
            overflow: hidden;
        }

        .help-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--primary-gradient);
        }

        .help-card h6 {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }

        .help-card p {
            color: var(--text-secondary);
            font-size: 1.1rem;
            margin-bottom: 2rem;
            line-height: 1.6;
        }

        .contact-info {
            display: flex;
            justify-content: center;
            gap: 3rem;
            flex-wrap: wrap;
            margin-top: 1.5rem;
        }

        .contact-info div {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: var(--text-secondary);
            font-size: 1rem;
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            background: rgba(255, 255, 255, 0.6);
            border-radius: 25px;
            transition: var(--transition);
        }

        .contact-info div:hover {
            background: rgba(255, 255, 255, 0.9);
            transform: translateY(-2px);
        }

        .contact-info i {
            color: #667eea;
            font-size: 1.2rem;
        }

        /* Enhanced Alerts */
        .alert {
            border-radius: 15px;
            padding: 2rem;
            margin: 2rem 0;
            border: none;
            animation: slideInDown 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            backdrop-filter: blur(10px);
            position: relative;
            overflow: hidden;
        }

        .alert::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
        }

        .alert-success {
            background: rgba(17, 153, 142, 0.1);
            color: #0d7377;
            border: 1px solid rgba(17, 153, 142, 0.2);
        }

        .alert-success::before {
            background: var(--success-gradient);
        }

        .alert-danger {
            background: rgba(255, 65, 108, 0.1);
            color: #c53030;
            border: 1px solid rgba(255, 65, 108, 0.2);
        }

        .alert-danger::before {
            background: var(--danger-gradient);
        }

        .alert-warning {
            background: rgba(240, 147, 251, 0.1);
            color: #744210;
            border: 1px solid rgba(240, 147, 251, 0.2);
        }

        .alert-warning::before {
            background: var(--warning-gradient);
        }

        /* Loading States */
        .loading-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(5px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .loading-spinner {
            width: 60px;
            height: 60px;
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-top: 4px solid #667eea;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Form Validation Enhancements */
        .form-control.is-valid {
            border-color: #11998e;
            box-shadow: 0 0 0 0.25rem rgba(17, 153, 142, 0.15);
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2311998e' d='m2.3 6.73.94-.94 1.38 1.38L7.7 4.08 6.76 3.14 4.25 5.65z'/%3e%3c/svg%3e");
        }

        .form-control.is-invalid {
            border-color: #ff416c;
            box-shadow: 0 0 0 0.25rem rgba(255, 65, 108, 0.15);
        }

        /* Floating Labels Effect */
        .form-floating {
            position: relative;
        }

        .form-floating > .form-control:focus ~ label,
        .form-floating > .form-control:not(:placeholder-shown) ~ label {
            opacity: 0.65;
            transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
        }

        /* Pulse Animation for Important Elements */
        .pulse {
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% {
                box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7);
            }
            70% {
                box-shadow: 0 0 0 15px rgba(102, 126, 234, 0);
            }
            100% {
                box-shadow: 0 0 0 0 rgba(102, 126, 234, 0);
            }
        }

        /* Custom Scrollbar */
        ::-webkit-scrollbar {
            width: 10px;
        }

        ::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
        }

        ::-webkit-scrollbar-thumb {
            background: var(--primary-gradient);
            border-radius: 5px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: linear-gradient(135deg, #5a6fd8 0%, #6a4c93 100%);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .payment-container {
                margin: 1rem auto;
                padding: 0 0.5rem;
            }

            .payment-header {
                padding: 2.5rem 1.5rem;
            }

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

            .payment-body {
                padding: 2rem 1.5rem;
            }

            .customer-section {
                padding: 2rem 1.5rem;
            }

            .amount-value {
                font-size: 2.8rem;
            }

            .pay-button {
                font-size: 1.2rem;
                padding: 1.25rem 2rem;
            }

            .security-badges {
                grid-template-columns: 1fr;
                gap: 0.75rem;
            }

            .contact-info {
                flex-direction: column;
                gap: 1rem;
            }
        }

        @media (max-width: 480px) {
            .payment-header h1 {
                font-size: 1.8rem;
            }

            .payment-body {
                padding: 1.5rem 1rem;
            }

            .customer-section {
                padding: 1.5rem 1rem;
            }

            .amount-value {
                font-size: 2.5rem;
            }

            .help-card {
                padding: 2rem 1.5rem;
            }
        }

        /* Micro-interactions */
        .form-control:hover {
            border-color: rgba(102, 126, 234, 0.3);
        }

        .package-details {
            transition: var(--transition);
        }

        .package-details:hover {
            transform: translateY(-2px);
        }

        /* Enhanced Button States */
        .pay-button:disabled {
            opacity: 0.7;
            transform: none;
            cursor: not-allowed;
            background: linear-gradient(135deg, #a0a0a0 0%, #808080 100%);
        }

        .pay-button:active:not(:disabled) {
            transform: translateY(-2px);
        }

        /* Result Container Styling */
        .result-container {
            margin-top: 2rem;
            animation: fadeIn 0.5s ease;
        }

        /* Enhanced Package Info */
        .package-details h6 {
            background: var(--primary-gradient);
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: 700;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }

        .package-details .row {
            margin-bottom: 1rem;
        }

        .package-details strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        /* Form Text Enhancements */
        .form-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
            margin-top: 0.5rem;
        }

        .invalid-feedback {
            font-weight: 600;
            font-size: 0.9rem;
        }

        /* Button Content Styling */
        .button-content, .button-loading {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.75rem;
        }

        .button-loading {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        /* Enhanced Input Group */
        .input-group .form-control {
            border-left: none;
            border-radius: 0 15px 15px 0;
        }

        .input-group .form-control:focus {
            border-left: 2px solid #667eea;
        }