:root {
            --cashapp-green: #00D632;
            --cashapp-dark-green: #00b32a;
            --cashapp-light-bg: #f3fbf5;
            --bg-light: #ececec;
            --card-bg: #ffffff;
            --text-dark: #000000;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
        
        body { 
            background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
            display: flex; 
            justify-content: center; 
            align-items: center; 
            min-height: 100vh; 
            padding: 16px; 
        }
        
        .payment-card {
            background: var(--card-bg);
            border-radius: 36px;
            padding: 28px 24px 24px 24px;
            box-shadow: 0 25px 45px -12px rgba(0,0,0,0.15), 0 2px 5px rgba(0,0,0,0.02);
            width: 100%;
            max-width: 440px;
            position: relative;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        
        .payment-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 30px 50px -15px rgba(0,0,0,0.2);
        }

        .top-indicator {
            width: 50px; 
            height: 5px; 
            background: #e0e0e0; 
            border-radius: 3px;
            position: absolute; 
            top: 14px; 
            left: 50%; 
            transform: translateX(-50%);
        }

        /* Header Section */
        .header-section { 
            text-align: center; 
            margin-bottom: 16px; 
        }
        
        .header-section h2 { 
            font-size: 22px; 
            font-weight: 800; 
            background: linear-gradient(135deg, #1a2a3a, #2d3e4e);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 8px; 
            letter-spacing: -0.3px;
        }
        
        .secure-badge {
            display: inline-flex; 
            align-items: center; 
            background: #e8f5e9; 
            color: var(--cashapp-dark-green);
            padding: 4px 12px; 
            border-radius: 30px; 
            font-size: 11px; 
            font-weight: 700; 
            gap: 5px;
        }

        /* Brand Section - CashApp Original Style */
        .brand-section {
            background: linear-gradient(135deg, #f8faf8, #ffffff);
            border: 1px solid #e8ece8;
            border-radius: 24px;
            padding: 16px; 
            text-align: center; 
            margin-bottom: 20px;
            transition: all 0.2s ease;
        }
        
        .brand-section:hover {
            border-color: rgba(0,214,50,0.2);
            box-shadow: 0 5px 15px rgba(0,214,50,0.05);
        }

        /* CashApp Original Logo Style */
        .brand-logo {
            width: 50px; 
            height: 50px; 
            background: linear-gradient(135deg, var(--cashapp-green), var(--cashapp-dark-green));
            border-radius: 16px;
            display: flex; 
            justify-content: center; 
            align-items: center; 
            margin: 0 auto 10px auto;
            color: white; 
            font-size: 26px; 
            font-weight: 800;
            box-shadow: 0 6px 14px rgba(0,214,50,0.2);
        }

        .brand-section h3 { 
            font-size: 17px; 
            font-weight: 800; 
            color: var(--text-dark);
            letter-spacing: -0.3px;
        }

        /* Amount Box */
        .amount-box { 
            background: linear-gradient(135deg, #f9fbf9, #f2f5f2);
            border-radius: 24px; 
            padding: 16px; 
            border: 1px solid #e5f0e5; 
            margin-bottom: 20px;
        }
        
        .amount-title {
            color: var(--cashapp-dark-green); 
            font-size: 10px; 
            font-weight: 800;
            text-transform: uppercase; 
            letter-spacing: 0.8px; 
            margin-bottom: 12px;
            display: flex; 
            align-items: center; 
            gap: 6px;
        }

        /* Input Wrapper */
        .input-wrapper {
            background: #fff; 
            border: 1.5px solid #e2e8e2; 
            border-radius: 60px;
            padding: 12px 16px; 
            display: flex; 
            align-items: center; 
            gap: 10px;
            transition: all 0.2s ease;
            margin-bottom: 16px;
        }
        
        .input-wrapper:focus-within {
            border-color: var(--cashapp-green);
            box-shadow: 0 0 0 3px rgba(0,214,50,0.1);
        }

        .input-wrapper span { 
            color: var(--cashapp-green); 
            font-weight: 800; 
            font-size: 18px; 
        }
        
        .input-wrapper input { 
            background: transparent; 
            border: none; 
            outline: none; 
            width: 100%; 
            font-size: 16px; 
            font-weight: 600; 
            color: var(--text-dark); 
        }
        
        .input-wrapper input::placeholder {
            color: #b0b8b0;
            font-weight: 500;
        }

        /* Amount Buttons */
        .grid-amounts { 
            display: grid; 
            grid-template-columns: repeat(3, 1fr); 
            gap: 8px; 
            margin-bottom: 12px; 
        }
        
        .amount-btn {
            background: #fff; 
            border: 1.5px solid #e2e8e2; 
            border-radius: 40px;
            padding: 10px 4px; 
            font-size: 13px; 
            font-weight: 700; 
            color: var(--text-dark);
            cursor: pointer; 
            transition: all 0.2s ease; 
            text-align: center;
        }

        .amount-btn.selected { 
            background: var(--cashapp-green); 
            border-color: var(--cashapp-green); 
            color: #fff; 
            box-shadow: 0 4px 10px rgba(0,214,50,0.2);
        }
        
        .amount-btn:hover {
            background: var(--cashapp-green);
            border-color: var(--cashapp-green);
            color: #fff;
            transform: translateY(-2px);
        }

        .grid-amounts-extended { 
            display: grid; 
            grid-template-columns: repeat(4, 1fr); 
            gap: 6px; 
            margin-bottom: 12px; 
        }
        
        .grid-amounts-extended.hidden { 
            display: none; 
        }
        
        .amount-btn-sm {
            background: #fff; 
            border: 1.5px solid #e2e8e2; 
            border-radius: 40px;
            padding: 7px 4px; 
            font-size: 12px; 
            font-weight: 700; 
            color: var(--text-dark);
            cursor: pointer; 
            text-align: center;
            transition: all 0.2s ease;
        }
        
        .amount-btn-sm.selected {
            background: var(--cashapp-green);
            border-color: var(--cashapp-green);
            color: #fff;
        }
        
        .amount-btn-sm:hover {
            background: var(--cashapp-green);
            border-color: var(--cashapp-green);
            color: #fff;
            transform: translateY(-1px);
        }

        .toggle-amounts-btn {
            background: transparent; 
            color: var(--cashapp-green); 
            border: 1px solid rgba(0,214,50,0.3); 
            width: 100%;
            padding: 7px; 
            margin-bottom: 8px;
            border-radius: 40px; 
            font-size: 11px; 
            font-weight: 700; 
            cursor: pointer;
            display: flex; 
            justify-content: center; 
            align-items: center; 
            gap: 6px;
            transition: all 0.2s ease;

        }
        
        .toggle-amounts-btn:hover {
            background: rgba(0,214,50,0.05);
            border-color: var(--cashapp-green);
        }

        /* Pay Button */
        .btn-pay-now {
            background: linear-gradient(135deg, var(--cashapp-green), var(--cashapp-dark-green));
            color: white; 
            border: none; 
            width: 100%;
            padding: 14px; 
            border-radius: 60px; 
            font-size: 15px; 
            font-weight: 800;
            cursor: pointer; 
            display: flex; 
            justify-content: center; 
            align-items: center; 
            gap: 8px;
            margin-top: 16px; 
            margin-bottom: 16px;
            transition: all 0.25s ease; 
            box-shadow: 0 4px 12px rgba(0,214,50,0.2);
            min-height: 52px;
        }
        
        .btn-pay-now:hover:not(:disabled) { 
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,214,50,0.3);
        }
        
        .btn-pay-now:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        /* Security Badges */
        .security-badges {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            padding: 10px 0 0;
            border-top: 1px solid #eeeef0;
            margin-top: 8px;
            flex-wrap: wrap;
        }
        
        .badge-item {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: 10px;
            color: #8899a6;
            font-weight: 600;
        }
        
        .badge-item i {
            font-size: 11px;
            color: var(--cashapp-green);
        }

        .powered-text {
            text-align: center;
            font-size: 10px;
            color: #aab4bc;
            padding-top: 8px;
            letter-spacing: 0.3px;
        }
        
        .powered-text i {
            color: var(--cashapp-green);
            margin-right: 4px;
        }
        
        .powered-text strong {
            color: var(--cashapp-green);
            font-weight: 700;
        }

        /* Loading & Error */
        .loading-spinner {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 10px;
            padding: 8px;
            background: rgba(0, 214, 50, 0.08);
            border-radius: 60px;
            color: var(--cashapp-green);
            font-size: 12px;
            font-weight: 600;
        }
        
        .error-message {
            margin-top: 10px;
            padding: 8px;
            background: rgba(239, 68, 68, 0.08);
            border-radius: 60px;
            color: #ef4444;
            text-align: center;
            font-size: 11px;
            font-weight: 600;
        }
        
        /* Mobile Optimized - No Scroll, Everything Visible */
        @media (max-width: 480px) {
            body { padding: 12px; }
            .payment-card { 
                padding: 20px 18px 18px 18px; 
                max-width: 100%;
                max-height: 95vh;
                overflow-y: auto;
            }
            .header-section h2 { font-size: 20px; }
            .brand-section { padding: 12px; margin-bottom: 16px; }
            .brand-logo { width: 45px; height: 45px; font-size: 22px; }
            .brand-section h3 { font-size: 15px; }
            .amount-box { padding: 14px; margin-bottom: 16px; }
            .input-wrapper { padding: 10px 14px; margin-bottom: 14px; }
            .input-wrapper span { font-size: 16px; }
            .input-wrapper input { font-size: 14px; }
            .grid-amounts { gap: 6px; margin-bottom: 10px; }
            .amount-btn { padding: 8px 3px; font-size: 11px; }
            .grid-amounts-extended { gap: 5px; }
            .amount-btn-sm { padding: 6px 3px; font-size: 10px; }
            .btn-pay-now { padding: 12px; font-size: 14px; min-height: 48px; margin-top: 12px; margin-bottom: 12px; }
            .security-badges { gap: 12px; }
            .badge-item { font-size: 9px; }
            .powered-text { font-size: 9px; }
        }
        
        @media (max-width: 380px) {
            .payment-card { padding: 16px 14px 14px 14px; }
            .grid-amounts { gap: 5px; }
            .amount-btn { padding: 7px 2px; font-size: 10px; }
            .grid-amounts-extended { gap: 4px; }
            .amount-btn-sm { padding: 5px 2px; font-size: 9px; }
            .btn-pay-now { padding: 10px; font-size: 13px; }
            .security-badges { gap: 10px; }
            .badge-item { font-size: 8px; }
        }