.container {
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            display: flex;
            align-items: center;
            padding: 20px 0;
            gap: 12px;
        }

        .back-button {
            background: transparent;
            border: none;
            color: #666;
            cursor: pointer;
            font-size: 15px;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .back-button:hover {
            color: #1a1a1a;
        }

        /* Progress Steps */
        .steps-container {
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
            position: relative;
            padding: 0 20px;
        }

        .step {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
        }

        .step::before {
            content: '';
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #e0e0e0;
            border: 2px solid #e0e0e0;
            margin-bottom: 8px;
            transition: all 0.3s ease;
            position: relative;
            z-index: 2;
        }

        .step.active::before {
            background: #3b82f6;
            border-color: #3b82f6;
        }

        .step.completed::before {
            background: #10b981;
            border-color: #10b981;
        }

        .step-label {
            font-size: 12px;
            color: #666;
            text-align: center;
            max-width: 100px;
        }

        .step.active .step-label {
            color: #1a1a1a;
            font-weight: 500;
        }

        .step-connector {
            position: absolute;
            top: 16px;
            left: 50%;
            width: 100%;
            height: 2px;
            background: #e0e0e0;
            z-index: 1;
        }

        .step:last-child .step-connector {
            display: none;
        }

        .step.completed .step-connector {
            background: #10b981;
        }

        /* Card */
        .card {
            background: white;
            border-radius: 12px;
            padding: 32px;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        }

        .payment-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
            padding-bottom: 20px;
            border-bottom: 1px solid #f0f0f0;
        }

        .payment-method {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .payment-logo {
            width: 40px;
            height: 40px;
            background: #f5f5f5;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .payment-logo img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        .payment-logo i {
            font-size: 20px;
        }

        .payment-method-text {
            font-size: 15px;
            font-weight: 500;
            color: #1a1a1a;
        }

        .status-badge {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 700;
            min-width: 100px;
            text-align: center;
        }

        .info-section {
            margin-bottom: 24px;
        }

        .info-label {
            font-size: 12px;
            color: #999;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .info-value {
            font-size: 20px;
            font-weight: 600;
            color: #1a1a1a;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .copy-btn {
            background: transparent;
            border: none;
            color: #3b82f6;
            cursor: pointer;
            font-size: 13px;
            font-weight: 500;
            padding: 4px 8px;
        }

        .copy-btn:hover {
            text-decoration: underline;
        }

        .action-buttons {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 32px;
        }

        .btn {
            padding: 14px 24px;
            border-radius: 8px;
            border: none;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .btn-primary {
            background: #3b82f6;
            color: white;
        }

        .btn-primary:hover {
            background: #2563eb;
        }

        .btn-secondary {
            background: white;
            border: 1px solid #e0e0e0;
            color: #1a1a1a;
        }

        .btn-secondary:hover {
            background: #f9f9f9;
        }

        .divider {
            text-align: center;
            color: #999;
            font-size: 13px;
            margin: 16px 0;
        }

        .notice {
            padding: 16px;
            border-radius: 8px;
            margin-bottom: 12px;
            font-size: 13px;
            line-height: 1.5;
        }

        .notice-success {
            background: #d1fae5;
            color: #065f46;
        }

        .notice-warning {
            background: #fee2e2;
            color: #991b1b;
        }

        .notice-title {
            font-weight: 600;
            margin-bottom: 4px;
        }

        /* Security Info */
        .security-info {
            margin-top: 32px;
            padding: 20px;
            background: #f9fafb;
            border-radius: 8px;
            text-align: center;
        }

        .security-info h3 {
            font-size: 14px;
            margin-bottom: 6px;
            color: #1a1a1a;
        }

        .security-info p {
            font-size: 12px;
            color: #666;
            line-height: 1.5;
        }

        /* Floating Button */
        .floating-btn {
            position: fixed;
            bottom: 24px;
            right: 24px;
            width: 56px;
            height: 56px;
            background: #25d366;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
            cursor: pointer;
            transition: all 0.3s ease;
            z-index: 1000;
        }

        .floating-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

        .floating-btn::before {
            content: '💬';
            font-size: 24px;
        }

        /* Confirmation Screen */
        .timer-display {
            text-align: center;
            margin: 40px 0;
        }

        .timer-text {
            font-size: 48px;
            font-weight: 700;
            color: #3b82f6;
            font-family: monospace;
        }

        .instruction-message {
            text-align: center;
            font-size: 15px;
            line-height: 1.6;
            margin: 30px 0;
            padding: 24px;
            background: #eff6ff;
            border-radius: 8px;
        }

        .instruction-message strong {
            color: #1e40af;
            display: block;
            margin-bottom: 8px;
            font-size: 16px;
        }

        /* Success Screen */
        .success-icon {
            width: 80px;
            height: 80px;
            background: #10b981;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
            font-size: 40px;
        }

        .success-title {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
            text-align: center;
        }

        .success-message {
            font-size: 14px;
            color: #666;
            margin-bottom: 32px;
            text-align: center;
        }

        /* Hide/Show Screens */
        .screen {
            display: none;
        }

        .screen.active {
            display: block;
        }

        /* Responsive */
        @media (max-width: 640px) {
            .container {
                padding: 5px;
            }

            .card {
                padding: 20px;
            }

            .info-value {
                font-size: 18px;
            }
        }