* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .container {
            background: white;
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
            max-width: 500px;
            width: 100%;
        }
        
        .header {
            background: #2c5aa0;
            color: white;
            padding: 30px;
            text-align: center;
        }
        
        .header h1 {
            font-size: 28px;
            margin-bottom: 10px;
        }
        
        .header p {
            opacity: 0.9;
        }
        
        .content {
            padding: 30px;
        }
        
        .order-card {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 25px;
            border-left: 4px solid #2c5aa0;
        }
        
        .amount {
            font-size: 32px;
            font-weight: bold;
            color: #2c5aa0;
            text-align: center;
            margin: 15px 0;
        }
        
        .timer {
            background: #fff3cd;
            color: #856404;
            padding: 12px;
            border-radius: 6px;
            text-align: center;
            margin: 15px 0;
            font-weight: bold;
        }
        
        .wallet-address {
            background: #e9ecef;
            padding: 15px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            word-break: break-all;
            margin: 15px 0;
            border: 1px dashed #6c757d;
        }
        
        .step {
            margin: 25px 0;
        }
        
        .step h3 {
            color: #495057;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .step-number {
            background: #2c5aa0;
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        
        input[type="text"] {
            width: 100%;
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 16px;
            margin: 10px 0;
            transition: border-color 0.3s;
        }
        
        input[type="text"]:focus {
            outline: none;
            border-color: #2c5aa0;
        }
        
        .btn {
            background: #2c5aa0;
            color: white;
            border: none;
            padding: 15px 25px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background 0.3s;
            width: 100%;
            margin: 5px 0;
        }
        
        .btn:hover {
            background: #1e3d6f;
        }
        
        .btn-copy {
            background: #28a745;
        }
        
        .btn-copy:hover {
            background: #218838;
        }
        
        .btn-success {
            background: #28a745;
        }
        
        .btn-success:hover {
            background: #218838;
        }
        
        .status {
            padding: 15px;
            border-radius: 8px;
            margin: 15px 0;
            text-align: center;
            font-weight: bold;
        }
        
        .status.success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }
        
        .status.error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }
        
        .status.pending {
            background: #fff3cd;
            color: #856404;
            border: 1px solid #ffeaa7;
        }
        
        .hidden {
            display: none;
        }
        
        .success-screen {
            text-align: center;
            padding: 40px 20px;
        }
        
        .success-icon {
            font-size: 64px;
            color: #28a745;
            margin-bottom: 20px;
        }

        .fee-info {
            background: #f0f8ff;
            border: 1px solid #b8daff;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
        }

        .fee-info h4 {
            color: #004085;
            margin-bottom: 10px;
        }

        .fee-row {
            display: flex;
            justify-content: space-between;
            margin: 5px 0;
            padding: 5px 0;
            border-bottom: 1px solid #d1ecf1;
        }

        .fee-amount {
            font-weight: bold;
            color: #155724;
        }