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

/* 基本样式 */
body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: #3498db;
    transition: color 0.3s;
}

a:hover {
    color: #2980b9;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 500;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

ul {
    list-style: none;
}

section {
    padding: 4rem 0;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: #3498db;
    color: #fff;
    border-radius: 4px;
    transition: background-color 0.3s;
    cursor: pointer;
    font-weight: 500;
    text-align: center;
}

.btn:hover {
    background-color: #2980b9;
    color: #fff;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 15px;
}

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: #3498db;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: #333;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

nav ul li a.active, nav ul li a:hover {
    color: #3498db;
}

nav ul li a.active::after, nav ul li a:hover::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #3498db;
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区样式 */
.hero {
    padding: 8rem 0 4rem;
    text-align: center;
    background: linear-gradient(to right, #3498db, #2c3e50);
    color: #fff;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.hero .btn {
    background-color: #fff;
    color: #3498db;
}

.hero .btn:hover {
    background-color: #f1f1f1;
    color: #2980b9;
}

/* 产品区样式 */
.products {
    background-color: #fff;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    padding: 2rem;
    border-radius: 8px;
    background-color: #f9f9f9;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.product-icon {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 1rem;
    text-align: center;
}

.product-card h3 {
    text-align: center;
    margin-bottom: 1rem;
}

.product-card p {
    margin-bottom: 1.5rem;
}

.product-card ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.product-card ul li {
    list-style-type: disc;
    list-style-position: outside;
    margin-bottom: 0.5rem;
}

.product-card .btn {
    margin-top: auto;
}

/* 关于我们简介区 */
.about-brief {
    text-align: center;
    background-color: #f5f5f5;
}

.about-brief p {
    max-width: 800px;
    margin: 0 auto 2rem;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    position: relative;
    padding-bottom: 0.8rem;
    margin-bottom: 1.2rem;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: #3498db;
}

.footer-section p {
    margin-bottom: 0.5rem;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    color: #fff;
    font-size: 1.5rem;
}

.social-icons a:hover {
    color: #3498db;
}

.copyright {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 80%;
        height: calc(100vh - 70px);
        background-color: #fff;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
        z-index: 999;
    }

    nav.active {
        left: 0;
    }

    nav ul {
        flex-direction: column;
        padding: 2rem;
    }

    nav ul li {
        margin: 0 0 1rem 0;
    }

    .menu-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    section {
        padding: 3rem 0;
    }

    h2 {
        font-size: 1.8rem;
    }
}

@media screen and (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 7rem 0 3rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    section {
        padding: 2rem 0;
    }

    h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
}