* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    height: 100vh;
    display: flex;
    flex-wrap: wrap;
    overflow: hidden;
}

.block {
    width: 50%;
    height: 50vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: white;
    position: relative;
    transition: transform 0.3s ease, filter 0.3s ease;
    overflow: hidden;
}

.block:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

.block-content {
    text-align: center;
    z-index: 2;
}

.block h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.block-description {
    font-size: 1rem;
    max-width: 80%;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.block:hover .block-description {
    opacity: 1;
    transform: translateY(0);
}

.block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.block:hover::before {
    opacity: 1;
}

#refactoring {
    background-color: #2ecc71;
}

#patterns {
    background-color: #3498db;
}

#knowledge {
    background-color: #e74c3c;
}

#contacts {
    background-color: #f1c40f;
}

@media (max-width: 768px) {
    .block {
        width: 100%;
        height: 25vh;
    }
}