/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", Arial, sans-serif;
}

body {
    background-color: #f7f8fa;
    color: #333;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    background-color: #fff;
    border-bottom: 1px solid #e8e8e8;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 24px;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: #52c41a;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    padding: 6px 12px;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-link:hover,
.nav-link.active {
    color: #52c41a;
    background-color: rgba(82, 196, 26, 0.1);
}

/* 主内容区 */
.main-content {
    flex: 1;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-section {
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: 36px;
    color: #333;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 18px;
    color: #666;
}

/* 工具卡片网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.tool-card {
    background-color: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 20px;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.tool-icon {
    font-size: 48px;
    flex-shrink: 0;
}

.tool-content {
    flex: 1;
}

.tool-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
}

.tool-desc {
    color: #666;
    font-size: 14px;
    line-height: 1.5;
}

/* 页脚 */
.footer {
    background-color: #fff;
    padding: 24px;
    text-align: center;
    border-top: 1px solid #e8e8e8;
    color: #999;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
    }
    
    .nav-links {
        width: 100%;
        justify-content: center;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .tool-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .tool-card {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .tool-icon {
        font-size: 40px;
    }
}