body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fdf2f8;
}

header {
    background-color: #f472b6;
    color: white;
    padding: 10px 20px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
}

main {
    padding: 20px;
}

/* 卡片内容统一内边距 */
.card-body { padding: 2rem; }

/* 统一错误页配图尺寸 */
.not-found-image { max-width: 360px; }

/* 课程页图片统一裁切高度 */
.object-cover-250 { height: 250px; object-fit: cover; }

/* 信息 Chip */
.chip { display: inline-flex; align-items: center; border: 1px solid #e5e7eb; border-radius: 9999px; background: #ffffff; padding: .38rem .7rem; margin: .25rem .35rem .25rem 0; font-size: .95rem; }
.chip .chip-label { color: #6c757d; margin-right: .4rem; font-weight: 600; }
.chip-group { margin-bottom: .5rem; }