.inner-header {
    width: 100%;
    height: 3.2rem;
    position: absolute;
    top: 0px;
    left: 0px;
}

.inner-header-icon {
    color: #ffffff;
    height: 3.2rem;
    font-size: 1.5625rem;
    text-align: center;
    float: right;
    width: 3.2rem;
    position: relative;
    -webkit-transition: background 0.5s;
    -moz-transition: background 0.5s;
    -o-transition: background 0.5s;
    transition: background 0.5s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.inner-header-icon:hover {
    background-color: rgba(255, 255, 255, 0.2);
    cursor: pointer;
}

.inner-header-icon span {
    left: calc((100% - 1.5625rem) / 2);
    top: calc((100% - .0625rem) / 2);
    width: 1.5625rem;
    height: .125rem;
    margin: 0 0;
    background-color: #1a75bb;
}

.inner-header-icon span:nth-child(1) {
    transform: translateY(4px) rotate(0deg);
}

.inner-header-icon span:nth-child(2) {
    opacity: 0;
}

.inner-header-icon span:nth-child(3) {
    transform: translateY(-4px) rotate(0deg);
    -webkit-transform: translateY(-4px) rotate(0deg);
    -moz-transform: translateY(-4px) rotate(0deg);
    -ms-transform: translateY(-4px) rotate(0deg);
    -o-transform: translateY(-4px) rotate(0deg);
}


.inner-header-icon-click span:nth-child(1) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: clickfirst;
}

.inner-header-icon-click span:nth-child(2) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: clicksecond;
}

.inner-header-icon-click span:nth-child(3) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: clickthird;
    margin-top: -0.25rem;
}


/*第一条线旋转动画*/
@keyframes clickfirst {
    0% {
        transform: translateY(4px) rotate(0deg);

    }

    100% {
        transform: translateY(0) rotate(45deg);
    }
}

/*第二条线淡入淡出动画动画*/
@keyframes clicksecond {
    0% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}

/*第三条线旋转动画*/
@keyframes clickthird {
    0% {
        transform: translateY(-4px) rotate(0deg);
    }

    100% {
        transform: translateY(0) rotate(-45deg);
    }
}

.inner-header-icon-out span:nth-child(1) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: outfirst;
}

.inner-header-icon-out span:nth-child(2) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: outsecond;
}

.inner-header-icon-out span:nth-child(3) {
    animation-duration: 0.5s;
    animation-fill-mode: both;
    animation-name: outthird;
}

@keyframes outfirst {
    0% {
        transform: translateY(0) rotate(-45deg);
    }

    100% {
        transform: translateY(-4px) rotate(0deg);
    }
}

@keyframes outsecond {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes outthird {
    0% {
        transform: translateY(0) rotate(45deg);
    }

    100% {
        transform: translateY(4px) rotate(0deg);
    }
}

.inner-nav {
    background-color: #fff;
    width: 100%;
    position: absolute;
    top: 3.2rem;
    left: 0px;
    /* padding-top: 30px;
    padding-bottom: 80px; */
    display: none;
}

.inner-nav a {
    width: 90%;
    display: inline-block;
    line-height: 3.2rem;
    text-decoration: none;
    color: #333;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    font-weight: 300;
}