body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

header nav ul li {
    display: inline;
    margin: 0 10px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 5px;
}

header nav ul li a:hover {
    background-color: #575757;
}

.container {
    margin-top: 70px;
    padding: 20px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    position: relative;
    z-index: 1;
}

h1, h2 {
    text-align: center;
    color: #333;
}

h2 {
    background-color: #ffcc00;
    padding: 10px;
    border-radius: 5px;
}

p {
    text-align: center;
}

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

.stat {
    background-color: #f9f9f9;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    width: 48%;
    text-align: center;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.stat h3 {
    margin: 0;
    color: #333;
}

.stat span {
    color: #d9534f;
    font-weight: bold;
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

form input[type="text"],
form input[type="password"],
form input[type="email"],
form input[type="number"],
form select {
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
    width: 100%;
    max-width: 300px;
}

form input[type="submit"],
form button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    margin-top: 10px;
    width: 100%;
    max-width: 300px;
}

form input[type="submit"]:hover,
form button:hover {
    background-color: #45a049;
}

.promotion-message {
    background-color: #ffd700;
    color: #d32f2f;
    padding: 10px;
    border: 1px solid #d32f2f;
    border-radius: 5px;
    text-align: center;
    margin-bottom: 20px;
    font-weight: bold;
}

.qr-code-container {
    text-align: center;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.qr-code-container img {
    max-width: 100%;
    height: auto;
}

.button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    margin: 5px;
}

.button:hover {
    background-color: #45a049;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 10px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
}

.pagination {
    text-align: center;
    margin-top: 20px;
}

.pagination a {
    color: #333;
    text-decoration: none;
    padding: 8px 16px;
    border: 1px solid #ddd;
    margin: 0 4px;
    border-radius: 5px;
    display: inline-block;
}

.pagination a:hover {
    background-color: #ddd;
}

.email-box {
    margin-top: 20px;
    text-align: center;
}

.email-box textarea {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    resize: none;
}

.email-box button {
    margin-top: 10px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.email-box button:hover {
    background-color: #45a049;
}

.copy-button {
    background-color: #4CAF50;
    color: white;
    padding: 5px 10px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    margin-left: 10px;
    font-size: 14px;
}

.copy-button:hover {
    background-color: #45a049;
}

.api-info {
    background-color: #f9f9f9;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 10px;
}

.api-info p {
    margin: 5px 0;
}

code {
    display: block;
    white-space: pre-wrap;
    word-wrap: break-word;
    background-color: #f9f9f9;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 10px;
    font-family: monospace;
    color: #333;
}

.python-code {
    background-color: #f4f4f4;
    border-left: 4px solid #f0ad4e;
    padding-left: 10px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    width: 100%;
    bottom: 0;
    left: 0;
}