/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    scroll-behavior: smooth;
}

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

/* 导航栏 */
header {
    background-color: #fff;
    color: #333;
    padding: 15px 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.header-scrolled {
    padding: 10px 0;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.logo h1 {
    font-size: 24px;
    margin: 0;
    font-weight: 700;
    color: #2c3e50;
}

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

nav ul {
    list-style: none;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

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

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #3498db;
    transition: width 0.3s ease;
}

nav ul li a:hover::after {
    width: 100%;
}

/* 横幅 */
.banner {
    background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('logo.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: #fff;
    padding: 200px 0;
    text-align: center;
    margin-top: 80px;
}

.banner h2 {
    font-size: 56px;
    margin-bottom: 25px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    font-weight: 700;
    line-height: 1.2;
}

.banner p {
    font-size: 24px;
    margin-bottom: 40px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    background-color: #3498db;
    color: #fff;
    padding: 18px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn:hover {
    background-color: #2980b9;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

/* 产品中心 */
.products {
    padding: 100px 0;
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 40px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 700;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: #7f8c8d;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.product-item {
    background-color: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
    position: relative;
    overflow: hidden;
}

.product-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: #3498db;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.product-item:hover::before {
    transform: scaleY(1);
}

.product-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.product-item h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #2c3e50;
    font-weight: 600;
}

.product-item p {
    color: #6c757d;
    line-height: 1.8;
}

/* 产品特点 */
.features {
    padding: 100px 0;
    background-color: #f8f9fa;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-item {
    background-color: #fff;
    padding: 45px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: #e3f2fd;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 32px;
    color: #3498db;
    transition: all 0.3s ease;
}

.feature-item:hover .feature-icon {
    background-color: #3498db;
    color: #fff;
    transform: scale(1.1);
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.feature-item p {
    color: #6c757d;
    line-height: 1.8;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background-color: #fff;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.about-image {
    flex: 1;
    min-width: 300px;
}

.about-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.about p {
    font-size: 18px;
    line-height: 1.8;
    color: #6c757d;
    margin-bottom: 25px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background-color: #f8f9fa;
}

.contact-info {
    background-color: #fff;
    padding: 50px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid #e9ecef;
}

.contact-info p {
    font-size: 18px;
    margin-bottom: 20px;
    color: #333;
    display: flex;
    align-items: center;
}

.contact-info p i {
    color: #3498db;
    margin-right: 15px;
    font-size: 20px;
}

/* 页脚 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    flex: 1;
    min-width: 250px;
}

.footer-logo h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-logo p {
    color: #bdc3c7;
    line-height: 1.8;
}

.footer-links {
    flex: 1;
    min-width: 200px;
}

.footer-links h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links ul li a:hover {
    color: #3498db;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 30px;
    text-align: center;
    color: #bdc3c7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .banner h2 {
        font-size: 40px;
    }
    
    .banner p {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        padding: 20px 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    nav ul.active {
        max-height: 300px;
    }
    
    nav ul li {
        margin: 15px 0;
    }
    
    .menu-toggle {
        display: block;
        cursor: pointer;
        font-size: 24px;
    }
    
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #3498db;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2980b9;
}