:root {
    --C0: #b3e1ff;
    --C1: #71CAFF;
    --C2: #008CBA;
    --C3: #006996;

    --N-S: 16px;
}

* {
    margin: 0;
    padding: 0;
}

html {
    padding: 0;
    margin: 0;
}

body, html {
    position: absolute;
    left: 0;
    right: 2px;
    top: 0;
    bottom: 28px;
}

body {
    font-family: fangsong, serif;
}

a:link {
    color: blue;
    text-decoration: none;
}

a:visited {
    color: blue;
    text-decoration: none;
}

a:hover {
    color: red;
    text-decoration: none;
}

a:active {
    color: black;
    text-decoration: none;
}

input {
    vertical-align: middle;
    height: 20px;
    outline: none;
    border-radius: 20px;
    background: #fff;
    border: 2px solid var(--C2);
    color: #000;
    padding-left: 10px;
    letter-spacing: 1px;
    transition: all 0.25s ease;
}

textarea {
    outline: none;
    border-radius: 20px;
    background: #fff;
    border: 2px solid var(--C2);
    color: #000;
    padding-left: 10px;
    letter-spacing: 1px;
    transition: all 0.25s ease;
}

.default_button {
    box-sizing: content-box;
    vertical-align: middle;
    height: 20px;
    outline: none;
    text-align: center;
    border-radius: 20px;
    background: #fff;
    border: 2px solid var(--C2);
    color: var(--C2);
    padding-left: 10px;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.default_button:hover {
    background-color: var(--C2);
    color: white;
}

/*导航栏*/
ul.navigation_bar {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--C3);
    height: 47px;
    font-size: var(--N-S);
}

ul.navigation_bar li {
    float: left;
}

ul.navigation_bar li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    transition: all 0.25s ease;
}

ul.navigation_bar li a:hover {
    background-color: var(--C2);
}

ul.navigation_bar li span {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
}

ul.navigation_bar li select {
    background: var(--C3);
    border: 0;
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    margin: 9px 5px;
    transition: all 0.25s ease;
    font-size: var(--N-S);
    font-family: fangsong, serif;
}

ul.navigation_bar li select:hover {
    background: var(--C2);
    border-color: var(--C1);
}

ul.navigation_bar li select select:focus {
    outline: none;
    box-shadow: 0 0 5px var(--C1);
}

ul.navigation_bar li select option {
    background: var(--C3);
    color: white;
    padding: 5px;
    cursor: pointer;
    transition: all 0.25s ease;
}

ul.navigation_bar li select option:hover {
    background-color: var(--C2);
}

ul li.navigation_bar_right {
    float: right;
}

/*PopupDiv*/
.mask {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.5);
}

.popup_div {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    padding: 0;
}

/*Waiting*/
.waiting_div {
    border-radius: 10px;
    background-color: white;
}

.waiting_circle {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    text-align: center;
    font-family: 'Circle', serif;
    font-size: 75px;
    color: var(--C3);
}

.waiting_info {
    position: absolute;
    top: 105px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 22px;
    color: black;
    display: inline;
    white-space: nowrap;
}

/*Window*/
.window {
    border-style: ridge;
    border-width: 4px;
    border-color: var(--C1);
}

.title_bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 20px;
    background-color: var(--C1);
    border-style: solid;
    border-width: 0 0 2px 0;
    border-color: var(--C2);
    padding: 0;
}

.window_title {
    position: absolute;
    margin-top: 1px;
    left: 2px;
    height: 16px;
    font-size: 16px;
    color: black;
}

.window_area {
    position: absolute;
    top: 22px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: white;
    padding: 0;
}

.close_button {
    position: absolute;
    border-style: none;
    margin-top: 2px;
    width: 15px;
    right: 2px;
    height: 16px;
    color: var(--C3);
    background-color: var(--C0);
    cursor: pointer;
}

.close_button:hover {
    color: var(--C0);
    background-color: #af0000;
}

.close_button span {
    position: absolute;
    top: -3px;
    left: 2px;
    text-align: center;
    font-family: Arial, serif;
    font-size: 20px;
}

/*InfoBox*/
.info_box {
    position: absolute;
    top: 30px;
    height: 30px;
    left: 0;
    right: 0;
}

.info_box_text {
    width: 100px;
    height: 30px;
    margin: auto;
    background-color: var(--C0);
    color: var(--C3);
    border-radius: 5px;
    text-align: center;
    font-size: 25px;
}