body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f4f4;
}

/* Main Content */
main {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    text-align: center;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.app-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-decoration: none;
    color: #333;
    transition: transform 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.app-card:hover {
    transform: translateY(-5px);
}

.app-card h3 {
    margin-top: 0;
}

.button {
    display: inline-block;
    background: #333;
    color: white;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #333;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}