.hero-section {
    background: url('https://images.unsplash.com/photo-1591696205602-2f950c417cb9') no-repeat center center/cover;
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
}
.hero-overlay {
    background-color: rgba(0, 0, 0, 0.6);
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}
.hero-content {
    position: relative;
    z-index: 2;
}
.section-title {
    border-bottom: 3px solid #007BFF;
    display: inline-block;
    margin-bottom: 20px;
}
.card:hover {
    transform: translateY(-5px);
    transition: 0.3s;
}