body
{
    margin: 0;
    font-family: Arial, sans-serif;
}

/* ヘッダー */
header
{
    /*background: #333;*/
    background-image: url(./img/header01.jpg);
    background-position: center;
    color: #fff;    
    padding: 10px;
    text-align: center;
    height: 120px;
}

/* 共通ナビ */
nav
{
    /*background: #444;*/
    background-color: #2D3026;
}
nav ul
{
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center; /*← 横方向中央寄せ */
}
nav ul li
{
    position: relative;
}
nav ul li a
{
    display: block;
    padding: 12px 20px;
    /*color: white;*/
    color: White;
    text-decoration: none;
}
nav ul li a:hover
{
    background: #666;
}

/* ▼ PC用プルダウン */
nav ul li ul
{
    display: none;
    position: absolute;
    background: #555;
    min-width: 250px;
    top: 100%;
    left: 0;
}
nav ul li:hover ul
{
    display: block;
}
nav ul li ul li
{
    width: 100%;
}

/* 2カラムレイアウト */
.container
{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 20px auto;
    max-width: 1200px;
}
.left
{
    flex: 0 0 800px;
    background: #f0f0f0;
    padding: 20px;
    box-sizing: border-box;
}
.middleColum
{
    flex: 0 0 20px;
}
.right
{
    flex: 0 0 400px;
    background: #ddd;
    padding: 20px;
    box-sizing: border-box;
}

/* フッター */
footer
{
    /*background: #333;*/
    background-image: url(./img/wallppr031.gif);
    color: #fff;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
}

/* ▼ ハンバーガーメニュー (スマホ用) */
.menu-toggle
{
    display: none;
}
.menu-icon
{
    display: none;
    font-size: 24px;
    padding: 12px;
    cursor: pointer;
    color: white;
}

/* ▼ スマホ用 サブメニュー開閉チェック */
.submenu-toggle
{
    display: none;
}
.submenu-icon
{
    display: none;
    padding: 12px;
    cursor: pointer;
    color: white;
    background: #444;
}

/* スマホ用 */
@media (max-width: 900px)
{
    nav ul
    {
        display: none;
        flex-direction: column;        
    }
    .menu-toggle:checked + .menu-icon + ul
    {
        display: flex;
    }
    .menu-icon
    {
        display: block;
        background: #444;
        background-color: #004400;
    }

    /* サブメニューはチェックボックスで開閉 */
    nav ul li ul
    {
        position: static;
        display: none;
    }
    .submenu-toggle:checked + .submenu-icon + ul
    {
        display: block;
    }

    .container
    {
        flex-direction: column;
    }
    .left, .right
    {
        flex: 1 1 100%;
        max-width: 100%;
    }
}