/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: #f9f9f9;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部 */
.header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 主内容区 */
.main {
    flex: 1;
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

/* 工具卡片 */
.tool-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.tool-icon {
    font-size: 3rem;
    line-height: 1;
    flex-shrink: 0;
}

.tool-info {
    flex: 1;
    min-width: 0;
}

.tool-name {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--primary-color);
    word-wrap: break-word;
}

.tool-description {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.5;
    word-wrap: break-word;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.empty-icon {
    font-size: 5rem;
    margin-bottom: 20px;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #666;
}

.empty-state p {
    color: #999;
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 20px;
    color: #999;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .tool-card {
        padding: 20px;
    }
}