body {
    margin: 0;
    font-family: sans-serif;
    background: #f5f5f5;
    color: #333;
}

.section {
    padding: 20px;
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 10px;
    border-left: 6px solid #3498db;
    padding-left: 10px;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.portal-button {
    background: #3498db;
    color: white;
    font-size: 1rem;
    border: none;
    border-radius: 12px;
    padding: 20px;
    aspect-ratio: 1 / 1;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: background 0.2s;
}

.portal-button:hover {
    background: #2980b9;
}

a.portal-button {
    color: white;
}