/* 全局样式和变量 */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --text-color: #333;
    --text-light: #777;
    --background-color: #f5f7fa;
    --card-background: #fff;
    --border-color: #eaeaea;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --container-width: 1200px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部导航 */
header {
    background-color: var(--card-background);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo a:hover {
    color: var(--primary-dark);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    font-size: 1rem;
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* 主要内容 */
main {
    padding: 40px 0;
    min-height: calc(100vh - 280px);
}

/* 搜索栏 */
.search-section {
    margin-bottom: 40px;
    text-align: center;
}

#search-input {
    width: 100%;
    max-width: 600px;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

#search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

#search-button {
    padding: 15px 30px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    margin-left: 10px;
    transition: var(--transition);
}

#search-button:hover {
    background-color: var(--primary-dark);
}

/* 分类容器 */
.categories-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

/* 分类卡片 */
.category-card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.category-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.category-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    color: white;
    font-size: 1.5rem;
}

.category-info h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.category-info p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 工具列表 */
.tools-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-top: 20px;
}

.tool-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.tool-item:hover {
    background-color: #eef2f7;
}

.tool-logo {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    overflow: hidden;
}

.tool-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tool-info {
    flex: 1;
}

.tool-info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.tool-info p {
    font-size: 0.8rem;
    color: var(--text-light);
}

.tool-rating {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: #f39c12;
}

/* 更多按钮 */
.more-tools {
    text-align: center;
    margin-top: 20px;
}

.more-tools a {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

.more-tools a:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
}

/* 分类详情页样式 */
.category-detail-header {
    margin-bottom: 30px;
    text-align: center;
}

.category-detail-header h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.category-detail-header p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
}

.back-button {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 20px;
    background-color: var(--border-color);
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.back-button:hover {
    background-color: #ddd;
}

/* 分类详情页的工具列表 */
.detail-tools-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.detail-tool-card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.detail-tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.detail-tool-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.detail-tool-logo {
    width: 60px;
    height: 60px;
    border-radius: 10px;
    background-color: var(--background-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    overflow: hidden;
}

.detail-tool-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.detail-tool-info h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.detail-tool-description {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 15px;
    flex: 1;
}

.detail-tool-link {
    display: inline-block;
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    transition: var(--transition);
}

.detail-tool-link:hover {
    background-color: var(--primary-dark);
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 隐藏的工具 */
.hidden-tools {
    display: none;
}

/* 页脚 */
footer {
    background-color: var(--card-background);
    padding: 40px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-info h3,
.footer-links h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.footer-info p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-links ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-bottom a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        padding: 15px;
    }
    
    .logo h1 {
        margin-bottom: 15px;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .search-section {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    #search-button {
        margin-left: 0;
        margin-top: 15px;
        width: 100%;
        max-width: 600px;
    }
    
    .categories-container {
        grid-template-columns: 1fr;
    }
    
    .detail-tools-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 5px 10px;
    }
    
    main {
        padding: 20px 0;
    }
    
    .category-card {
        padding: 20px;
    }
    
    .footer-content {
        gap: 20px;
    }
}