/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 - 含邮箱样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.logo {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.logo span {
    font-size: 1.5rem;
    color: #ffd700;
    margin-left: 0.5rem;
}

.slogan {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 0.8rem;
}

/* 合作邮箱样式（显眼） */
.contact-email {
    font-size: 1.1rem;
    color: #fff;
    background: rgba(0,0,0,0.2);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
}

#searchInput {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 4px 0 0 4px;
    font-size: 1rem;
}

#searchBtn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-size: 1rem;
}

#searchBtn:hover {
    background-color: #45a049;
}

/* 分类导航 */
.category-nav {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.category-btn {
    background-color: transparent;
    border: none;
    color: #333;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.category-btn.active {
    background-color: #667eea;
    color: white;
}

.category-btn:hover:not(.active) {
    background-color: #f0f0f0;
    color: #667eea;
}

/* 工具卡片 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.tool-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s ease;
}

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

.tool-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.tool-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.tool-card p {
    color: #666;
    margin-bottom: 1rem;
    height: 48px;
}

.tool-link {
    display: inline-block;
    background-color: #667eea;
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.5rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.tool-link:hover {
    background-color: #5a6edb;
}

/* 页脚 */
footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer-email {
    margin-top: 0.5rem;
    font-size: 1rem;
    opacity: 0.9;
}

/* 响应式（适配手机） */
@media (max-width: 768px) {
    .logo {
        font-size: 2rem;
    }
    .contact-email {
        font-size: 1rem;
        padding: 0.4rem 0.8rem;
    }
    .category-btn {
        margin: 0 0.25rem;
        padding: 0.5rem 0.75rem;
    }
}