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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    overflow-x: hidden;
}

#targetDiv {
    width: 100%;
    min-height: 100vh;
    background-color: #f8f9fa;
}

/* Header Styles */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2c7be5;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #2c7be5;
}

/* Hero Section */
.hero {
    background-color: #2c7be5;
    color: #fff;
    padding: 10rem 2rem 6rem;
    text-align: center;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    max-width: 800px;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    max-width: 600px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: #fff;
    color: #2c7be5;
    text-decoration: none;
    font-weight: bold;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Section Styles */
.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #333;
}

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    color: #666;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Products Section */
.products {
    background-color: #fff;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.product-card {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.product-card i {
    font-size: 3rem;
    color: #2c7be5;
    margin-bottom: 1rem;
}

.product-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #333;
}

/* Features Section */
.features {
    background-color: #f8f9fa;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.feature-item i {
    font-size: 3rem;
    color: #2c7be5;
    margin-bottom: 1rem;
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #333;
}

/* Advantages Section */
.advantages {
    background-color: #fff;
}

.advantages-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
}

.advantage-item i {
    font-size: 2rem;
    color: #2c7be5;
    margin-right: 1rem;
    margin-top: 0.5rem;
}

.advantage-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

/* Introduction Section */
.introduction {
    background-color: #fff;
}

.introduction-content {
    display: flex;
    gap: 3rem;
    align-items: center;
    flex-wrap: wrap;
}

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

.intro-image {
    flex: 1;
    min-width: 300px;
    text-align: center;
}

.intro-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* FAQ Section */
.faq {
    background-color: #f8f9fa;
}

.faq-item {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.faq-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

/* Footer */
footer {
    background-color: #333;
    color: #fff;
    padding: 3rem 2rem 1rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    margin-bottom: 2rem;
}

.footer-links li {
    margin: 0 1rem;
}

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

.footer-links a:hover {
    color: #2c7be5;
}

.copyright {
    border-top: 1px solid #444;
    padding-top: 1rem;
    margin-top: 2rem;
    color: #999;
}

/* Download Button */
.downlbtnvmmn {
    display: inline-block;
    padding: 1.2rem 2.5rem;
    background-color: #2c7be5;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    border-radius: 50px;
    font-size: 1.2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin: 0.5rem;
}

.downlbtnvmmn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(44, 123, 229, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .products-grid,
    .features-grid,
    .advantages-list {
        grid-template-columns: 1fr;
    }
}

/* Version History Section */
.version-history {
    background-color: #f8f9fa;
}

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

.version-item {
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #2c7be5;
}

.version-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.version-number {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2c7be5;
}

.version-date {
    font-size: 1rem;
    color: #999;
}

.version-changes {
    list-style-type: none;
    padding-left: 0;
}

.version-changes li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    line-height: 1.6;
    color: #666;
}

.version-changes li:before {
    content: "•";
    color: #2c7be5;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Additional Styles for专题 pages */
.topic-page {
    background-color: #f8f9fa;
    min-height: 100vh;
}

.topic-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 8rem 2rem 4rem;
}

.topic-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.topic-content h2 {
    font-size: 2rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.topic-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 1.5rem;
}

.topic-content ul {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.topic-content li {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 0.5rem;
}