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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 1rem 0;
}

nav ul li {
    display: inline-block;
    margin: 0 1rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    color: #3498db;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.resource-section {
    margin-bottom: 3rem;
}

.resource-section h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1rem;
    transition: transform 0.2s;
}

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

.resource-card h3 {
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.resource-card p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.download-btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.download-btn:hover {
    background-color: #2980b9;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: #2c3e50;
    color: white;
}

/* 移动端适配 */
@media (max-width: 768px) {
    header {
        padding: 1rem 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    nav ul {
        padding: 0.5rem 0;
    }

    nav ul li {
        display: block;
        margin: 0.5rem 0;
    }

    main {
        padding: 1rem;
    }

    .resource-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .resource-card {
        margin-bottom: 1rem;
    }

    footer {
        padding: 1rem;
        font-size: 0.9rem;
    }

    footer p {
        margin: 0.5rem 0;
    }
}

/* 小屏幕手机适配 */
@media (max-width: 320px) {
    header h1 {
        font-size: 1.2rem;
    }

    .resource-card h3 {
        font-size: 1rem;
    }

    .resource-card p {
        font-size: 0.8rem;
    }

    footer {
        font-size: 0.8rem;
    }
}