body {
    font-family: Arial, sans-serif;
    background-color: #121212; /* Dark background */
    color: #fff;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.curved-box {
    background-color: #1e1e1e; /* Dark container */
    border-radius: 16px; /* Curved edges */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 800px;
    padding: 20px;
    text-align: center;
    color: #fff;
    margin: 20px;
}

.header {
    text-align: center;
}

.header h1 {
    margin: 0;
    color: #fff;
}

.header .preview {
    margin-top: 4px;
    font-size: 14px;
    color: #aaa;
}

.header button {
    margin-top: 10px;
    padding: 8px 16px;
    font-size: 16px;
    background-color: #fff;
    color: #000;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.content {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    flex-wrap: wrap;
}

.text-section {
    flex: 1;
    padding-right: 20px;
    text-align: left;
    min-width: 250px;
}

.text-section h2 {
    font-size: 24px;
    color: #fff;
}

.text-section p {
    margin: 10px 0;
    color: #bbb;
}

.payment-section {
    flex: 1;
    text-align: center;
    padding-left: 20px;
    min-width: 250px;
    border-left: 1px solid #333;
}

.payment-section img.qr-code {
    width: 150px;
    height: 150px;
    margin-bottom: 20px;
}

.payment-methods {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    margin: 10px 0;
    width: 100%;
    max-width: 200px;
    border: none;
    border-radius: 4px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    text-align: left;
    background-color: #333;
    text-decoration: none;
}

.btn img.method-logo {
    width: 24px;
    height: 24px;
    margin-right: 10px;
    border-radius: 50%;
}

.bkash {
    background: linear-gradient(45deg, #e2136e, #ea13fe); /* Bkash gradient */
    border: none;
    border-radius: 8px;
    color: white;
    padding: 15px 30px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.bkash:hover {
    background: linear-gradient(45deg, #ea13fe, #e2136e); /* Reverse gradient on hover */
    transform: scale(1.05);
}

.bkash:active {
    transform: scale(0.95);
}

.bkash:focus {
    outline: none;
}

.nagad {
    background: linear-gradient(45deg, #f7931d, #e84a27); /* Nagad gradient */
    border: none;
    border-radius: 8px;
    color: white;
    padding: 15px 30px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.nagad:hover {
    background: linear-gradient(45deg, #e84a27, #f7931d); /* Reverse gradient on hover */
    transform: scale(1.05);
}

.nagad:active {
    transform: scale(0.95);
}

.nagad:focus {
    outline: none;
}

.rocket {
    background: linear-gradient(45deg, #7c49e3, #da48ff); /* Rocket gradient */
    border: none;
    border-radius: 8px;
    color: white;
    padding: 15px 30px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.rocket:hover {
    background: linear-gradient(45deg, #da48ff, #7c49e3); /* Reverse gradient on hover */
    transform: scale(1.05);
}

.rocket:active {
    transform: scale(0.95);
}

.rocket:focus {
    outline: none;
}

.upay {
    background: linear-gradient(45deg, #00a5e4, #f7931d); /* Upay gradient */
    border: none;
    border-radius: 8px;
    color: white;
    padding: 15px 30px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.upay:hover {
    background: linear-gradient(45deg, #f7931d, #00a5e4); /* Reverse gradient on hover */
    transform: scale(1.05);
}

.upay:active {
    transform: scale(0.95);
}

.upay:focus {
    outline: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .content {
        flex-direction: column;
    }
    .text-section, .payment-section {
        padding: 0;
        border-left: none;
    }
    .text-section {
        text-align: center;
    }
}