/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

a {
    text-decoration: none;
    color: #333;
}

a:hover {
    color: #d32f2f;
}

ul {
    list-style: none;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo h1 {
    color: #d32f2f;
    font-size: 28px;
}

nav ul {
    display: flex;
}

nav ul li a {
    padding: 10px 15px;
    font-weight: bold;
}

nav ul li a.active, nav ul li a:hover {
    color: #d32f2f;
    border-bottom: 2px solid #d32f2f;
}

/* 主体内容样式 */
.hero {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 10px;
}

.about-preview, .products-preview, .news-preview {
    background-color: #fff;
    padding: 40px 0;
    text-align: center;
}

.about-preview h3, .products-preview h3, .news-preview h3 {
    font-size: 28px;
    margin-bottom: 30px;
    color: #d32f2f;
}

.slogan {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 40px;
}

.preview-grid {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}

.preview-item {
    flex: 1;
    min-width: 250px;
    padding: 20px;
    border: 1px solid #eee;
    text-align: left;
}

.preview-item h4 {
    margin-bottom: 10px;
    color: #d32f2f;
}

.product-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}

.product-item {
    background-color: #f9f9f9;
    padding: 15px 25px;
    border-radius: 5px;
    font-weight: bold;
}

.product-item:hover {
    background-color: #e0e0e0;
}

.news-list {
    text-align: left;
    max-width: 800px;
    margin: 0 auto;
}

.news-list li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

.view-all {
    display: inline-block;
    margin-top: 30px;
    padding: 10px 20px;
    background-color: #d32f2f;
    color: #fff;
    border-radius: 5px;
}

.view-all:hover {
    background-color: #b71c1c;
    color: #fff;
}

/* 关于我们和联系我们页面样式 */
main.container {
    background-color: #fff;
    padding: 40px;
    margin-top: 20px;
}

main h2 {
    text-align: center;
    color: #d32f2f;
    margin-bottom: 30px;
}

main section {
    margin-bottom: 30px;
}

main h3 {
    color: #d32f2f;
    margin-bottom: 10px;
}

.contact-info p {
    font-size: 18px;
    margin-bottom: 15px;
}

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