/* #region 基础 */
html {
    font-size: 16px;
    background: #f7f7f7;
}

@media screen and (min-width: 375px) {
    html {
        /* iPhone6的375px尺寸作为16px基准，414px正好18px大小, 600 20px */
        font-size: calc(100% + 2 * (100vw - 375px) / 39);
        font-size: calc(16px + 2 * (100vw - 375px) / 39);
    }
}

@media screen and (min-width: 414px) {
    html {
        /* 414px-1000px每100像素宽字体增加1px(18px-22px) */
        font-size: calc(112.5% + 4 * (100vw - 414px) / 586);
        font-size: calc(18px + 4 * (100vw - 414px) / 586);
    }
}

@media screen and (min-width: 600px) {
    html {
        /* 600px-1000px每100像素宽字体增加1px(20px-24px) */
        font-size: calc(125% + 4 * (100vw - 600px) / 400);
        font-size: calc(20px + 4 * (100vw - 600px) / 400);
    }
}

@media screen and (min-width: 1000px) {
    html {
        /* 1000px往后是每100像素0.5px增加 */
        font-size: calc(137.5% + 6 * (100vw - 1000px) / 1000);
        font-size: calc(22px + 6 * (100vw - 1000px) / 1000);
    }
}

.wrapper {
    box-sizing: border-box;
    width: 1400px;
    margin: 0 auto;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.clearfix {
    zoom: 1;
}

.clearfix::before,
.clearfix::after {
    display: block;
    clear: both;
    content: "";
    visibility: hidden;
    height: 0;
}

.img {
    font-size: 0;
}

.img a {
    display: block;
    width: 100%;
    height: 100%;
}

.img img {
    width: 100%;
    height: 100%;
}

/* #endregion */

/* #region 头部 */
.header {
    box-sizing: border-box;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    width: 100%;
    height: 2.75rem;
    padding: 0 0.9375rem;
    background: #fff;
}

.header .back-up {
    position: absolute;
    left: 0.9375rem;
    width: 0.9375rem;
    height: 0.9375rem;
}

.header a {
    display: block;
    width: 100%;
    height: 100%;
    font-size: 0;
}

.header img {
    width: 100%;
    height: 100%;
}

.header .title {
    margin: 0 auto;
    color: #333;
    font-size: 1.125rem;
    font-weight: 500;
}

.header .menu {
    position: absolute;
    right: 0.9375rem;
    width: 1.375rem;
    height: 1.375rem;
}

.header .save {
    color: #999;
    font-size: 0.875rem;
}

/* #endregion */

/* #region */

/* #endregion */

/* #region */

/* #endregion */

/* #region */

/* #endregion */