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

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

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
    padding: 1rem 5%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar .logo h1 {
    color: #007bff;
    font-size: 1.5rem;
}

.navbar .logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

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

.nav-links a:hover {
    color: #007bff;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
    padding: 120px 5% 60px;
}

.hero h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.hero-buttons a {
    display: inline-block;
    padding: 10px 25px;
    margin: 0 10px;
    background-color: #fff;
    color: #007bff;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
}

.core-features {
    padding: 60px 5%;
    text-align: center;
}

.core-features h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.feature-item {
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.feature-item h4 {
    margin-bottom: 0.5rem;
}

.advantages {
    padding: 60px 5%;
    background-color: #f8f9fa;
    text-align: center;
}

.advantages h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.advantages .subtitle {
    color: #007bff;
    margin-bottom: 2rem;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.advantage-item {
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 8px;
}

.advantage-item h4 {
    margin-bottom: 0.5rem;
}

.features-content {
    padding: 40px 5%;
    max-width: 900px;
    margin: 0 auto;
}

.feature-section {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.feature-section h3 {
    color: #007bff;
    margin-bottom: 0.5rem;
}

.feature-section p {
    margin-bottom: 1rem;
}

.feature-section ul {
    padding-left: 1.5rem;
}

.feature-section li {
    margin-bottom: 0.5rem;
}

.contact-content {
    padding: 40px 5%;
    text-align: center;
}

.contact-content p {
    margin-bottom: 0.5rem;
}

.about-content {
    padding: 40px 5%;
    max-width: 800px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 2rem;
}

.about-section h3 {
    color: #007bff;
    margin-bottom: 1rem;
}

.about-section h4 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

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

.advantages-content {
    padding: 40px 5%;
    max-width: 600px;
    margin: 0 auto;
}

.advantages-content .advantage-item {
    margin-bottom: 1.5rem;
    text-align: center;
}

.pricing-content {
    padding: 60px 5%;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.pricing-content .pricing-item {
    padding: 2rem;
    background-color: #fff;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    border: 2px solid transparent;
}

.pricing-content .pricing-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.pricing-content .pricing-item h3 {
    color: #007bff;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.pricing-content .pricing-item .subtitle {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.pricing-content .pricing-item .price {
    font-size: 2.5rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 1.5rem;
}

.pricing-content .pricing-item ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1.5rem;
}

.pricing-content .pricing-item li {
    padding: 0.5rem 0;
    color: #555;
    border-bottom: 1px solid #eee;
}

.pricing-content .pricing-item li:last-child {
    border-bottom: none;
}

.pricing-content .pricing-item .popular {
    position: absolute;
    top: -12px;
    right: 20px;
    background-color: #ff6b6b;
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.pricing-content .pricing-item:nth-child(2) {
    border: 2px solid #007bff;
}

.privacy-content {
    padding: 40px 5%;
    max-width: 800px;
    margin: 0 auto;
}

.privacy-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: #007bff;
}

.privacy-content p {
    margin-bottom: 0.5rem;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 30px 5%;
    text-align: center;
}

footer p {
    padding: 0.3rem 0;
    color: #ccc;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
        gap: 1rem;
    }
    
    .hero h2 {
        font-size: 1.6rem;
    }
}