/* Khối Khóa Học Liên Quan - Phần 1: Khóa Học Khác */
.course-bottom-cross-nav {
    margin-top: 30px;
    margin-bottom: 20px;
    width: 100%;
    box-sizing: border-box;
}
.related-courses-section {
    background: #FFFFFF;
    border-radius: 12px;
    border: 1px solid #E2E8F0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    padding: 18px 14px;
    margin-bottom: 26px;
    box-sizing: border-box;
    width: 100%;
    overflow: hidden;
}
.related-section-header {
    border-bottom: 2px solid #F1F5F9;
    padding-bottom: 14px;
    margin-bottom: 18px;
}
.related-header-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: #FEF2F2;
    color: #8B1E1E;
    font-size: 11.5px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid #FECACA;
    margin-bottom: 6px;
    text-transform: uppercase;
}
.related-section-title {
    margin: 0 0 6px 0;
    font-size: 17px;
    font-weight: 800;
    color: #8B1E1E;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    line-height: 1.35;
}
.related-section-desc {
    margin: 0;
    font-size: 13px;
    color: #64748B;
    line-height: 1.45;
}
.related-courses-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    width: 100%;
    box-sizing: border-box;
}
.related-course-card {
    background: #FFFFFF;
    border: 1.5px solid #E2E8F0;
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    box-sizing: border-box;
}
.related-course-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(139, 30, 30, 0.12);
    border-color: #8B1E1E;
}
.related-thumb-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    height: auto;
    overflow: hidden;
    background: #0F172A;
}
.related-badge-corner {
    position: absolute;
    top: 10px;
    left: auto;
    right: 10px;
    max-width: calc(50% - 10px);
    box-sizing: border-box;
    text-align: center;
    white-space: normal;
    overflow-wrap: anywhere;
    z-index: 2;
    background: linear-gradient(135deg, #DC2626 0%, #991B1B 100%);
    color: #FFFFFF;
    font-size: 11px;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: 4px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}
.related-thumb-link {
    display: block;
    width: 100%;
    height: 100%;
}
.related-thumb-link img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.35s ease;
    display: block;
}

.related-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #8B1E1E 0%, #1E293B 100%);
    color: #FFFFFF;
    font-size: 40px;
}
.related-card-body {
    padding: 14px;
    display: flex;
    flex-direction: column;
    flex: 1;
    box-sizing: border-box;
}
.related-course-title {
    margin: 0 0 8px 0;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.4;
    min-height: 42px;
}
.related-course-title a {
    color: #1E293B;
    text-decoration: none;
    transition: color 0.2s;
}
.related-course-title a:hover {
    color: #8B1E1E;
}
.related-price-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px dashed #E2E8F0;
    flex-wrap: wrap;
}
.related-price-sale {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary, #8B1E1E);
    line-height: 1.2;
}
.related-price-goc {
    font-size: 13px;
    color: var(--text-muted, #64748B);
    text-decoration: line-through;
    margin-left: 2px;
}
.related-meta-list {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 14px;
    font-size: 12px;
    color: #64748B;
}
.related-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}
.related-meta-item i {
    color: #8B1E1E;
    width: 14px;
    text-align: center;
}
.related-action-row {
    margin-top: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.btn-related-detail {
    background: #F1F5F9;
    color: #334155;
    border: 1px solid #CBD5E1;
    border-radius: 6px;
    padding: 8px 10px;
    font-size: 12.5px;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    min-height: 38px;
    box-sizing: border-box;
    transition: all 0.2s;
}
.btn-related-detail:hover {
    background: #E2E8F0;
    color: #1E293B;
}
.btn-related-reg {
    background: linear-gradient(135deg, #8B1E1E 0%, #6B1212 100%);
    color: #FFFFFF;
    border: none;
    border-radius: 6px;
    padding: 8px 10px;
    font-size: 12.5px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    min-height: 38px;
    box-sizing: border-box;
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn-related-reg:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(139, 30, 30, 0.3);
}

@media (min-width: 640px) {
    .related-courses-section {
        padding: 22px;
    }
    .related-section-title {
        font-size: 19px;
    }
    .related-courses-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }
}

@media (min-width: 980px) {
    .related-courses-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
}