body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
}

header {
    background-color: #004d2c;
    padding: 20px;
    text-align: center;
}

header h1 {
    color: #ffffff;
    font-size: 40px;
    margin-bottom: 15px;
}

header p {
    color: #f0f8f0;
    font-size: 24px;
}

nav {
    text-align: center;
    padding: 20px;
}

nav a {
    display: inline-block;
    background-color: #006644;
    color: white;
    text-decoration: none;
    padding: 20px 40px;
    font-size: 30px;
    border-radius: 15px;
    margin: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

nav a:hover {
    background-color: #008855;
    color: white;
}

.menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 30px 10px;
}

.menu a {
    display: block;
    background-color: #006644;
    color: white;
    text-decoration: none;
    padding: 16px 30px;
    font-size: 24px;
    width: 80%;
    max-width: 400px;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    text-align: left;
    text-indent: -1.5em;
    padding-left: 2.5em;
    transition: all 0.2s;
}

.menu a:hover {
    background-color: #008855;
    transform: scale(1.03);
}

main {
    padding: 30px 20px;
    font-size: 24px;
    line-height: 1.6;
}

img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ccc;
    border-radius: 8px;
    margin: 20px 0;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #004d2c;
    color: white;
    font-size: 16px;
}

.back-buttons {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    margin: 40px 0;
}

.back-button {
    display: inline-block;
    background-color: #cc6600; /* ← オレンジ系 */
    color: white;
    text-decoration: none;
    padding: 20px 20px;
    font-size: 24px;
    border-radius: 15px;
    min-width: 150px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

.back-button:hover {
    background-color: #e67300; /* ← ホバー時 少し明るめに */
    color: white;
}

.center-image {
    display: block;
    margin-left: auto;
    margin-right: auto;
}