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

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

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

header {
    background: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .logo {
    float: left;
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 2px;
}

header nav {
    float: right;
}

header nav ul {
    list-style: none;
}

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

header nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 10px;
    border-radius: 5px;
}

header nav ul li a:hover,
header nav ul li a.active {
    background-color: rgba(255,255,255,0.2);
    color: #ffd700;
}

.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 100px 0;
    margin-bottom: 40px;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease;
}

.banner p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.banner .btn {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.banner .btn:hover {
    background: #ffd700;
    color: #1a365d;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 32px;
    color: #1a365d;
    margin-bottom: 15px;
}

.section-title p {
    color: #666;
    font-size: 16px;
}

.services {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-item {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #e8e8e8;
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border-color: #667eea;
}

.service-item .icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    font-weight: bold;
}

.service-item h3 {
    font-size: 20px;
    color: #1a365d;
    margin-bottom: 15px;
}

.service-item p {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
}

.about-us {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-content .img-placeholder {
    width: 100%;
    height: 300px;
    background: linear-gradient(135deg, #e8e8e8 0%, #f5f5f5 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 14px;
    border: 2px dashed #ddd;
}

.about-content h3 {
    font-size: 24px;
    color: #1a365d;
    margin-bottom: 20px;
}

.about-content p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px;
}

.feature-item .number {
    font-size: 48px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 10px;
}

.feature-item .label {
    color: #666;
    font-size: 14px;
}

.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-item {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.product-item .img-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #e8e8e8 0%, #f5f5f5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 12px;
}

.product-item .product-info {
    padding: 25px;
}

.product-item h3 {
    font-size: 18px;
    color: #1a365d;
    margin-bottom: 10px;
}

.product-item p {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

.product-item .btn {
    display: inline-block;
    padding: 8px 20px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    transition: background 0.3s;
}

.product-item .btn:hover {
    background: #764ba2;
}

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

.news-item {
    background: white;
    padding: 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    transition: all 0.3s;
    border-left: 4px solid #667eea;
}

.news-item:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateX(5px);
}

.news-item .date {
    color: #999;
    font-size: 14px;
    margin-bottom: 10px;
}

.news-item h3 {
    font-size: 18px;
    color: #1a365d;
    margin-bottom: 10px;
}

.news-item p {
    color: #666;
    font-size: 14px;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

.contact-item {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: 15px;
}

.contact-item .icon {
    width: 54px;
    height: 54px;
    margin: 0 auto 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.contact-item h3 {
    font-size: 16px;
    color: #1a365d;
    margin-bottom: 10px;
}

.contact-item p {
    color: #666;
    font-size: 14px;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    font-size: 14px;
    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: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

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

footer {
    background: #1a365d;
    color: white;
    padding: 50px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 18px;
    color: #ffd700;
}

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

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

.footer-section ul li a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #ffd700;
}

.footer-section p {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    font-size: 14px;
}

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

@media (max-width: 1200px) {
    .container {
        width: 95%;
    }
    
    .services, .products, .features, .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header .logo {
        float: none;
        text-align: center;
        margin-bottom: 15px;
    }
    
    header nav {
        float: none;
        text-align: center;
    }
    
    header nav ul li {
        margin: 0 10px;
    }
    
    .banner h1 {
        font-size: 32px;
    }
    
    .services, .products, .features, .contact-info, .footer-content {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        gap: 30px;
    }
}