body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
    background-color: #f0f0f0;
}

h1 {
    margin-top: 40px;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 600px;
    margin: 50px auto;
    padding: 0 20px;
}

.button-grid a {
    display: block;
    padding: 10px 5px;
    background-color: white;
    color: #a5a4f2;
    text-decoration: none;
    border: 1px solid #a5a4f2;
    border-radius: 32px;
    font-size: 16px;
    box-shadow: 0 4px 8px rgba(177, 156, 217, 0.3);
    transition: 
      color 0.3s,
      border-color 0.3s,
      box-shadow 0.3s;
}

/* 少し色濃く */
.button-grid a:hover {
  color: #8887e1;
  border-color: #8887e1;
  box-shadow: 0 6px 12px rgba(138, 111, 193, 0.4);
}

/* 空白用 */
.button-grid .empty {
    visibility: hidden;
}

.site-footer {
    text-align: center;
    font-size: 12px;
    color: #666;
    margin-top: 30px;
    padding: 5px 0;
    border-top: 1px solid #ccc;
}