<style>
/* ====== Global Styles ====== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f9f9f9;
    color: #333;
    margin: 0;
    padding: 0;
}

/* ====== Container ====== */
.payment-container {
    max-width: 500px;
    margin: 50px auto;
    background: #fff;
    padding: 30px 40px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

/* ====== Form Header ====== */
.payment-container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #075e54;
}

/* ====== Input Fields ====== */
.payment-container input[type="text"],
.payment-container input[type="tel"],
.payment-container input[type="number"] {
    width: 100%;
    padding: 12px 14px;
    margin: 10px 0 20px;
    border: 1px solid #ccc;
    border-radius: 6px;
    transition: border-color 0.3s ease;
}

.payment-container input:focus {
    border-color: #0b8c78;
    outline: none;
}

/* ====== Submit Button ====== */
.payment-container button[type="submit"] {
    width: 100%;
    padding: 12px;
    background-color: #0b8c78;
    color: white;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.payment-container button[type="submit"]:hover {
    background-color: #075e54;
}

/* ====== Alerts ====== */
.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 5px solid #28a745;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 5px;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 5px solid #dc3545;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 5px;
}

/* ====== Loader Spinner ====== */
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #0b8c78;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
    display: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ====== Responsive ====== */
@media (max-width: 600px) {
    .payment-container {
        margin: 20px;
        padding: 20px;
    }

    .payment-container h2 {
        font-size: 20px;
    }
}
</style>