/* 基础样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', 'Open Sans', sans-serif;
    color: #333;
    background: linear-gradient(135deg, #003f73, #4c2a85);
    background-size: cover;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: rgba(0, 0, 0, 0.6);
    padding: 20px;
    text-align: center;
    color: #fff;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

header h1 {
    margin: 0;
    font-size: 24px;
}

nav {
    margin-top: 10px;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #ff5722;
}

.main-content {
    flex: 1;
    padding: 100px 20px 20px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

.card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.card img {
    width: 100%;
    height: auto;
}

.card-content {
    padding: 15px;
}

.card-content h3 {
    margin: 0 0 10px 0;
    color: #0056b3;
    font-size: 20px;
}

.card-content p {
    margin: 0;
    font-size: 16px;
    line-height: 1.5;
}

.article-section {
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 10px;
    margin-top: 40px;
}

.article-section h2, .article-section h3 {
    color: #003f73;
}

.article-section pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
}

.article-section table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.article-section table, .article-section th, .article-section td {
    border: 1px solid #ddd;
}

.article-section th, .article-section td {
    padding: 12px;
    text-align: left;
}

.footer {
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    text-align: center;
    padding: 20px;
}

.footer p {
    margin: 5px 0;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 20px;
    }
    
    nav a {
        margin: 0 10px;
        font-size: 14px;
    }
    
    .card-content h3 {
        font-size: 18px;
    }
    
    .card-content p {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 18px;
    }
    
    nav a {
        margin: 0 8px;
        font-size: 12px;
    }
    
    .card-content h3 {
        font-size: 16px;
    }
    
    .card-content p {
        font-size: 12px;
    }
}

@media (min-width: 1440px) {
    .main-content {
        padding: 120px 40px 40px 40px;
    }
    
    .card-content h3 {
        font-size: 22px;
    }
    
    .card-content p {
        font-size: 18px;
    }
}

.aurora-move {
    animation: auroraMove 15s linear infinite;
}

@keyframes auroraMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.code-preview {
    background: #272822;
    color: #f8f8f2;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
}

.highlight {
    background: #ffffe0;
    padding: 2px 4px;
    border-radius: 3px;
}

@media (max-width: 1024px) {
    .main-content {
        padding: 100px 15px 15px 15px;
    }
}