ul {
    list-style: none;
    display: grid;
    gap: 20px;
    margin-top: 30px;
}

a {
    display: block;
    text-decoration: none;
    color: #2c3e50;
    background: white;
    padding: 25px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(102, 126, 234, 0.1);
    font-size: 1.1rem;
    font-weight: 700;
    position: relative;
}

a:hover {
    color: #667eea;
}

/* アイコンを追加 */
a::after {
    content: '→';
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    opacity: 0.6;
    transition: all 0.3s ease;
}