body
{
    -webkit-text-size-adjust: 100%;
}
#wrapper
{
    width: 640px;
}
#header
{
    position: fixed;
    z-index: 100;
    top: 0;

    width: 640px;
    height: 130px;
}
#header ._hamburger
{
    position: absolute;
    top: 0;
    right: 0;

    width: 130px;
    height: 130px;

    background-image: url(../img/hamburger.png);
}
#menu
{
    position: fixed;
    z-index: 200;
    top: 130px;

    display: none;
    overflow: hidden;

    width: 640px;
    height: 0;
}
#menu ._menu_1,
#menu ._menu_2,
#menu ._menu_3
{
    display: block;

    width: 640px;
    height: 130px;
}
#menu ._menu_1
{
    background-image: url(../img/menu_1.png);
}
#menu ._menu_2
{
    background-image: url(../img/menu_2.png);
}
#menu ._menu_3
{
    background-image: url(../img/menu_3.png);
}
#contents
{
    margin-top: 130px;
}
#footer img
{
    float: left;
}


/* @group utility ----------------------------------------- */
.u-text_hide
{
    text-decoration: none;
    text-indent: -9999px;
}
.u-backgroundPosition_right
{
    background-position: right;
}
/* @end utility */