body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

header {
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    padding: 1rem;
    text-align: center;
}

.search-container {
    margin: 1rem auto;
    display: flex;
    justify-content: center;
}

.search-container input {
    padding: 0.5rem;
    width: 60%;
    border: none;
    border-radius: 4px 0 0 4px;
}

.search-container button {
    padding: 0.5rem 1rem;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

main {
    display: flex;
    padding: 1rem;
    padding-bottom: 6rem; /* 增加底部内边距，防止被footer遮挡 */
}

.categories {
    width: 20%;
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.categories ul {
    list-style-type: none;
    padding: 0;
}

.categories li {
    padding: 0.5rem;
    margin: 0.3rem 0;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.categories li:hover {
    background-color: #f0f0f0;
}

.categories li.active {
    background-color: #6e8efb;
    color: white;
}

.category-badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    margin-right: 0.5rem;
    background-color: #e0e0e0;
    border-radius: 12px;
    font-size: 0.8rem;
    color: #333;
}

.sites {
    width: 80%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    padding: 0 1rem;
}

.site-card {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.site-card:hover {
    transform: translateY(-5px);
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding: 1rem;
    background: #333;
    color: white;
}