/* 通用样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
}

/* 头部样式 */
header {
    background: #333;
    color: #fff;
    padding-top: 20px;
    min-height: 70px;
    border-bottom: #77aaff 3px solid;
}

header h1 {
    float: left;
    margin: 0;
    padding: 0;
}

header nav {
    float: right;
    margin-top: 10px;
}

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

header li {
    display: inline;
    padding: 0 15px;
}

header a {
    color: #fff;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 16px;
    transition: color 0.3s ease;
}

header a:hover,
header a.active {
    color: #77aaff;
}

/* 主要内容区域 */
main {
    padding: 20px 0;
}

.content-section {
    background: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    display: none; /* 默认隐藏所有内容区域 */
}

.content-section.active {
    display: block; /* 当前激活的内容区域显示 */
}

.content-section h2 {
    color: #333;
    text-align: center;
    margin-bottom: 20px;
}

/* 产品介绍样式 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.product-item {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.05);
    text-align: left;
}

.product-item img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 15px;
}

.product-item h3 {
    color: #555;
    margin-top: 0;
}

/* 联系表单样式 */
.contact-form {
    max-width: 600px;
    margin: 20px auto;
    background: #f9f9f9;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

.contact-form .form-group {
    margin-bottom: 15px;
}

.contact-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box; /* 确保内边距和边框包含在元素的总宽度和高度内 */
}

.contact-form button {
    background: #77aaff;
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.contact-form button:hover {
    background: #5588cc;
}

/* 底部样式 */
footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    margin-top: 20px;
}