.site-header {
    padding: 24px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.92);
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 10px 30px rgba(15,23,42,0.08);
}

.site-nav {
    display: flex;
    gap: 24px;
    align-items: center;
}

.site-nav a {
    text-decoration: none;
    color: #111827;
    font-weight: 600;
    transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
    color: #3122d1;
}

.course-main {
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.course-hero {
    margin-bottom: 40px;
}

.course-hero-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.course-search {
    min-width: 260px;
    width: 100%;
    max-width: 320px;
}

.course-search input {
    width: 100%;
    padding: 18px 20px;
    border-radius: 18px;
    border: 1px solid #d1d5db;
    font-size: 16px;
    outline: none;
}

.course-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.course-filters .btn {
    padding: 12px 22px;
    border-radius: 999px;
}

.section-title {
    font-size: 32px;
    margin-bottom: 24px;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.course-card,
.featured-card {
    background: white;
    border-radius: 28px;
    padding: 28px;
    box-shadow: 0 20px 50px rgba(15,23,42,0.06);
}
.course-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 20px;
    align-items: stretch;
}

.course-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
}

.course-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.course-card > div {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.course-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 10px;
    border-top: 1px solid #eee;
}
.course-card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 20px;
    margin-bottom: 20px;
    display: block;
}

.course-card h3 {
    font-size: 22px;
    min-height: 60px;
    margin-bottom: 14px;
}

.course-card p {
    color: #64748b;
    flex-grow: 1;
    line-height: 1.75;
    margin-bottom: 22px;
}

.course-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 22px;
}

.course-tag {
    font-size: 14px;
    font-weight: 700;
    color: #3122d1;
}

.course-level {
    font-size: 12px;
    color: #475569;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    margin-top: auto;
    align-items: center;
}

.course-action {
    padding: 12px 24px;
}

.footer-basic {
    padding: 24px 40px;
    text-align: center;
    color: #64748b;
    font-size: 15px;
}

@media (max-width: 992px) {
    .course-main {
        padding: 30px 24px;
    }

    .course-hero-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-header {
        padding: 20px 24px;
    }
}

@media (max-width: 576px) {
    .course-hero-inner {
        gap: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .course-card,
    .featured-card {
        padding: 24px;
    }

    .footer-basic {
        padding: 20px 18px;
    }
}