<style>
    body { background: #080b11; color: white; font-family: sans-serif; display: flex; justify-content: center; align-items: center; min-height: 100vh; }
    .checkout-box { background: #121824; padding: 40px; border-radius: 20px; width: 350px; border: 1px solid #374151; }
    input { width: 100%; padding: 12px; margin: 10px 0; border-radius: 8px; border: 1px solid #374151; background: #080b11; color: white; }
    button { background: #10b981; border: none; padding: 12px; width: 100%; border-radius: 8px; font-weight: bold; cursor: pointer; }
</style>

<div class="checkout-box">
    <h3>Complete <?php echo strtoupper($_GET['method']); ?> Payment</h3>
    <p>Amount: $<?php echo number_format($_GET['amt'], 2); ?></p>
    <form action="process_final.php" method="POST">
        <input type="text" placeholder="Cardholder Name" required>
        <input type="text" placeholder="Card Number (4XXX XXXX XXXX)" required>
        <button type="submit">Pay Now</button>
    </form>
</div>