body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

h1 {
    color: #333;
    text-align: center;
    padding: 20px 0;
    border-bottom: 2px solid #ddd;
}

nav {
    padding: 20px;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0 0 30px 0;
}

nav ul li {
    margin: 10px 0;
}

nav ul li a {
    display: block;
    padding: 12px 20px;
    background-color: white;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

nav ul li a:hover {
    background-color: #007bff;
    color: white;
    transform: translateY(-2px);
}

/* 階層メニューのスタイル */
.menu-container {
    margin-bottom: 30px;
}

.menu-item {
    margin: 10px 0;
}

.menu-button {
    width: 100%;
    padding: 12px 20px;
    background-color: white;
    color: #333;
    border: none;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    cursor: pointer;
    text-align: left;
    font-size: 16px;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.menu-button:hover {
    background-color: #007bff;
    color: white;
    transform: translateY(-2px);
}

.menu-button.active {
    background-color: #007bff;
    color: white;
}

.arrow {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.submenu {
    display: none;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-radius: 0 0 5px 5px;
    margin-top: 2px;
    border-left: 3px solid #007bff;
}

.submenu-item {
    margin: 10px 0;
}

.submenu-button {
    width: 100%;
    padding: 10px 15px;
    background-color: white;
    color: #333;
    border: none;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    cursor: pointer;
    text-align: left;
    font-size: 14px;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.submenu-button:hover {
    background-color: #e9ecef;
    transform: translateY(-1px);
}

.submenu-button.active {
    background-color: #e9ecef;
}

.sub-submenu {
    display: none;
    padding: 10px 15px;
    background-color: #ffffff;
    border-radius: 0 0 4px 4px;
    margin-top: 2px;
    border-left: 2px solid #6c757d;
}

.sub-submenu p {
    margin: 0 0 10px 0;
    color: #666;
    line-height: 1.4;
    font-size: 13px;
}

.detail-link {
    display: inline-block;
    padding: 6px 12px;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 3px;
    font-size: 12px;
    transition: background-color 0.3s ease;
}

.detail-link:hover {
    background-color: #0056b3;
    color: white;
}

/* リソースセクションのスタイル */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.resource-section {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.resource-section:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.resource-section h3 {
    color: #333;
    margin: 0 0 15px 0;
    font-size: 18px;
    border-bottom: 2px solid #007bff;
    padding-bottom: 8px;
}

.resource-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.resource-link {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    background-color: #f8f9fa;
    color: #333;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-size: 14px;
}

.resource-link:hover {
    background-color: #007bff;
    color: white;
    transform: translateX(5px);
}

.resource-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    flex-shrink: 0;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 24px;
    }

    nav ul li a {
        padding: 10px 15px;
    }

    .menu-button {
        padding: 10px 15px;
        font-size: 14px;
    }

    .submenu {
        padding: 10px 15px;
    }

    .submenu-button {
        padding: 8px 12px;
        font-size: 13px;
    }

    .sub-submenu {
        padding: 8px 12px;
    }

    .resources-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .resource-section {
        padding: 15px;
    }

    .resource-link {
        padding: 8px 10px;
        font-size: 13px;
    }
}