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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .logo {
    font-size: 24px;
    font-weight: bold;
    float: left;
}

nav {
    float: right;
}

nav ul {
    list-style: none;
}

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

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #ffd700;
}

.clearfix::after {
    content: '';
    display: table;
    clear: both;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: #ffd700;
    color: #333;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255,215,0,0.4);
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 20px auto 0;
    border-radius: 2px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.product-card .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.product-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #333;
}

.product-card p {
    color: #666;
    line-height: 1.8;
}

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

.news-item {
    background: white;
    padding: 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: box-shadow 0.3s;
}

.news-item:hover {
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.news-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #333;
}

.news-item h3 a {
    color: #333;
    text-decoration: none;
}

.news-item h3 a:hover {
    color: #667eea;
}

.news-item .meta {
    color: #999;
    font-size: 14px;
    margin-bottom: 15px;
}

.news-item p {
    color: #666;
    line-height: 1.8;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.about-content h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #333;
}

.about-content p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-content ul {
    list-style: none;
    padding-left: 20px;
}

.about-content ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: #666;
}

.about-content ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #667eea;
}

.contact-form textarea {
    height: 150px;
    resize: vertical;
}

.contact-form button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.contact-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102,126,234,0.4);
}

.contact-info {
    max-width: 600px;
    margin: 40px auto 0;
    text-align: center;
}

.contact-info p {
    margin-bottom: 10px;
    color: #666;
}

footer {
    background: #333;
    color: white;
    padding: 40px 0;
    text-align: center;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: #ffd700;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1000;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    header .logo {
        float: none;
        text-align: center;
        margin-bottom: 15px;
    }
    
    nav {
        float: none;
        text-align: center;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
}