body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f8ff;
    color: #333;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
*, *::before, *::after {
    box-sizing: inherit;
}
.container {
    max-width: 800px;
    margin: 30px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}
h1, h2 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 20px;
}
h1 {
    font-size: 1.5em;
}
h2 {
    font-size: 1.2em;
}
p {
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 1em;
}
ul {
    list-style-type: none;
    padding: 0;
    columns: 1;
}
li {
    background-color: #e0f7fa;
    margin: 10px 0;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
    font-size: 1em;
}
li:hover {
    background-color: #b2ebf2;
}
.payment-info {
    margin-top: 20px;
    background-color: #ffeb3b;
    padding: 15px;
    border-radius: 5px;
}
.payment-info h2 {
    margin-top: 0;
}
.note {
    font-style: italic;
    color: #e74c3c;
    margin-top: 20px;
}
.back-button {
    display: block;
    width: 100%;
    text-align: center;
    margin: 20px 0;
}
.back-button a {
    text-decoration: none;
    color: #fff;
    background-color: #ff5722;
    padding: 10px 20px;
    border-radius: 5px;
    transition: background-color 0.3s;
    display: inline-block;
}
.back-button a:hover {
    background-color: #e64a19;
}
@media (max-width: 600px) {
    h1 {
        font-size: 1.2em;
    }
    h2 {
        font-size: 1em;
    }
    li {
        font-size: 0.9em;
    }
    .payment-info {
        padding: 10px;
    }
    .back-button a {
        padding: 8px 15px;
    }
    ul {
        columns: 1;
    }
}