:root {
    --primary: #e02e41;
    --secondary: #4a90e2;
    --light: #f8f9fa;
    --dark: #333;
    --gray: #666;
    --border: #e8e8e8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    background: #f5f5f5;
    padding: 20px;
    color: var(--dark);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header {
    background: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
}

.search-box {
    padding: 20px;
    display: flex;
    gap: 10px;
}

#searchInput {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid var(--border);
    border-radius: 4px;
}

#searchBtn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
}

.content {
    padding: 0 20px 20px;
}

.category {
    margin-bottom: 30px;
}

.category-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--primary);
    margin: 20px 0 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border);
}

.knowledge-item {
    background: var(--light);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 5px;
}

.knowledge-title {
    font-weight: bold;
    margin-bottom: 8px;
}

.knowledge-content {
    color: var(--gray);
    font-size: 14px;
    line-height: 1.6;
}