html {
    cursor: default;
    font-family: Verdana, Arial, "Microsoft JhengHei", "PingFang TC", sans-serif;
    font-size: 14px;
    background-color: #fdfdfd;
    color: #404547;
}

body {
    padding: 2rem 0;
    overflow-y: scroll;
}

p {
    max-width: 80rem;
}

.site_name {
    display: inline-block;
    margin: 0.4rem 1.5rem;
    font-size: 1.4rem;
    font-weight: bold;
    text-decoration: none;
    color: #404547;
}

.panel_menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: whitesmoke;
    text-align: center;
    z-index: 1;
}

.panel_menu ul {
    display: inline-block;
    list-style: none;
    color: #777;
    padding: 0;
    margin: 0;
    vertical-align: top;
}

.check_menu, .toggle_menu {
    display: none;
}
.toggle_menu {
    font-size: 20px;
    margin: 5px 10px;
    font-weight: bold;
    color: #555;
}

.panel_menu li {
    display: inline-block;
    margin: 0 0.1rem;
    padding: 0.6rem 1.1rem 0.2rem 1.1rem;
    border-bottom: 0.3rem solid transparent;
}
.panel_menu li:hover {
    border-bottom-color: #999;
}

.panel_menu li a {
    padding: 1rem 0px;
    color: grey;
    font-size: 1.2rem;
    text-decoration: none;
}

#a_home { display: none; }

.panel_main {
    margin: 0 auto;
    max-width: 90vw;
    overflow: auto;
}

.d_link a {
    margin-right: 1rem;
    font-size: 1.2rem;
}

.d_block {
    display: inline-block;
    margin-right: 2rem;
}

h2::before {
    display: block;
    content: " ";
    margin-top: -3rem;
    height: 3rem;
    visibility: hidden;
    pointer-events: none;
}

ul {
    list-style: "-  ";
}

.t_data {
    display: inline-table;
    border-collapse: collapse;
    font-family: 'consolas', 'SF Mono', monospace;
}
th {
    background-color: #d0d5d7;
}
td {
    background-color: #f0f5f7;
}
th, td {
    padding: 0.1em 0.5em;
    border: 1px solid #bbb;
}
tr:hover td { background-color: #cde; }

@media (max-width: 799px) {
    body {
        padding: 0 !important;
        margin-bottom: 4rem;
    }
    .panel_menu {
        top: auto;
        left: auto;
        right: 0;
        bottom: 0;
        width: auto;
        height: auto;
        border: 1px solid lightgrey;
        border-width: 1px 0 0 1px;
        border-top-left-radius: 5px;
    }
    .site_name {
        display: none;
    }
    .toggle_menu {
        display: inline-block;
    }
    .panel_menu ul {
        display: none;
        margin: 0 0 8px;
    }
    .panel_menu li {
        display: list-item;
        margin: 0;
        border-width: 0;
        padding: 4px 0;
    }
    .panel_menu li a {
        padding: 4px 14px;
    }
    #a_home { display: block; }
    .check_menu:checked ~ ul {
        display: block;
    }
    .panel_main {
        width: 95%;
    }
}