/* 全局设置 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式：渐变色背景 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 50px 0;
    text-align: center;
    border-radius: 0 0 20px 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
header h1 { margin: 0; font-size: 2.2em; }
header p { opacity: 0.9; margin-top: 10px; }

/* 卡片布局 */
.category { margin-top: 40px; }
.category h2 {
    border-left: 5px solid #764ba2;
    padding-left: 10px;
    margin-bottom: 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    border: 1px solid #eee;
    display: block;
}

/* 鼠标悬停特效 */
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(118, 75, 162, 0.15);
    border-color: #764ba2;
}

.card h3 { margin: 0 0 8px 0; color: #333; }
.card p { margin: 0; color: #666; font-size: 0.9em; line-height: 1.5; }

/* 底部 */
footer {
    text-align: center;
    padding: 40px 0;
    color: #999;
    font-size: 0.8em;
}
footer a { color: #764ba2; text-decoration: none; }