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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

.logo h1 {
    color: #764ba2;
    font-size: 2rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

.nav-menu a:hover {
    color: #764ba2;
}

main {
    margin-top: 80px;
}

.hero-section {
    background: linear-gradient(rgba(118, 75, 162, 0.8), rgba(102, 126, 234, 0.8));
    color: white;
    text-align: center;
    padding: 100px 20px;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.content-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 1.5rem;
}

.card-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #764ba2;
}

.card-content p {
    color: #666;
    line-height: 1.5;
}

.articles-section {
    background: rgba(255, 255, 255, 0.1);
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 20px;
    margin-bottom: 40px;
}

.articles-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

article {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

article h3 {
    color: #764ba2;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

article p {
    color: #555;
    line-height: 1.8;
    text-align: justify;
}

footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 2rem;
}

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

@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}