.page-header {
        background: linear-gradient(135deg, rgba(138, 100, 179, 0.1), rgba(163, 130, 199, 0.2));
        border-radius: 20px;
        padding: 50px 20px;
        text-align: center;
        margin-bottom: 40px;
        border: 1px solid rgba(138, 100, 179, 0.1);
        position: relative;
        overflow: hidden;
    }
    .page-header::before {
        content: '\f02b'; /* tag icon */
        font-family: 'Font Awesome 6 Free';
        font-weight: 900;
        position: absolute;
        font-size: 150px;
        color: rgba(138, 100, 179, 0.05);
        top: -30px;
        right: 10%;
        transform: rotate(15deg);
    }
    
    .badge-online { background-color: rgba(220, 53, 69, 0.9); color: white; font-weight: 600; }
    
    .course-card {
        border-radius: 16px;
        border: 1px solid rgba(220, 53, 69, 0.2) !important;
        transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        background: #FDFBFF;
        display: flex;
        flex-direction: column;
        height: 100%;
        overflow: hidden;
        position: relative;
    }
    .course-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(220, 53, 69, 0.15) !important;
    }
    .img-wrapper {
        overflow: hidden;
        border-top-left-radius: 16px;
        border-top-right-radius: 16px;
        background: #f8f9fa;
        aspect-ratio: 1 / 1;
    }
    .course-card img {
        object-fit: cover;
        width: 100%;
        height: 100%;
        display: block;
        transition: transform 0.5s ease;
    }
    .course-card:hover img {
        transform: scale(1.08);
    }
    .card-title-clamp {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        text-overflow: ellipsis;
        min-height: 2.8em;
    }
    .pulse-btn { animation: pulse-shadow 2s infinite; }
    @keyframes pulse-shadow {
        0% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.4); }
        70% { box-shadow: 0 0 0 10px rgba(220, 53, 69, 0); }
        100% { box-shadow: 0 0 0 0 rgba(220, 53, 69, 0); }
    }
    
    .promo-course-list {
        background: rgba(220, 53, 69, 0.05);
        border-radius: 10px;
        padding: 10px;
    }