* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #333;
    color: white;
    padding: 15px 0;
}

nav ul {
    list-style-type: none;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 16px;
}

main {
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.trade-section {
    text-align: center;
    margin-bottom: 30px;
}

.trade-section button {
    padding: 10px 20px;
    font-size: 18px;
    margin: 10px;
    cursor: pointer;
}

.form-section {
    margin-top: 20px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-size: 16px;
}

input, select {
    padding: 10px;
    font-size: 16px;
}

button[type="submit"] {
    padding: 15px 20px;
    font-size: 18px;
    background-color: #28a745;
    color: white;
    border: none;
    cursor: pointer;
}

button[type="submit"]:hover {
    background-color: #218838;
} 
 
.crypto-item {
    border: 1px solid #ccc;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

button.buy-button {
    padding: 10px 15px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button.buy-button:hover {
    background-color: #0056b3;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
    position: fixed;
    bottom: 0;
    width: 100%;
}
/* 样式 - 模态窗口 */
.modal {
    display: none; /* 默认隐藏 */
    position: fixed; 
    z-index: 1; /* 确保它在最上面 */
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto; /* 如果内容过多，则启用滚动 */
    background-color: rgb(0,0,0); /* 背景颜色 */
    background-color: rgba(0,0,0,0.4); /* 半透明背景 */
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* 可以根据需要调整 */
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}
/* 样式 - 模态窗口 */
.modal {
    display: none;
    position: fixed; 
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: black;
    cursor: pointer;
}

button {
    padding: 10px 20px;
    margin: 10px;
    border: none;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
}

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

.crypto-item {
    border: 1px solid #ddd;
    padding: 10px;
    margin: 10px 0;
}

form {
    display: flex;
    flex-direction: column;
}

form input, form select {
    margin: 10px 0;
    padding: 8px;
}