:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
    --text: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.semester-section {
    max-width: 1000px;
    margin: 0 auto 30px;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.semester-header {
    background: var(--primary);
    color: white;
    padding: 15px 20px;
    cursor: pointer;
    margin: 0;
}

.software-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

.software-card {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    transition: transform 0.2s;
}

.software-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.software-card img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 10px;
}

.software-card h3 {
    margin: 10px 0;
    color: var(--primary);
}

.software-card p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
}