/* totop ================================================== */

:root {
    font-size: 20px;
    --red: #da2c4d;
    --yellow: #f8ab37;
    --green: #2ecc71;
    --white: #ffffff;
    --grey-light: #f2f7f9;
    --grey: #ecedf3;
    --black: #080808;
    --black-blue: #1f2029;
    --black-blue-light: #353746;
    --black-blue-light-2: #404255;
    --black-blue-light-3: #4b4d64;
    --black-light: #424455;
}

body {
    font-family: 'Raleway', sans-serif;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.65;
    color: var(--grey);
    background-color: var(--black-blue);
    overflow-x: hidden;
    letter-spacing: 0.2px;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
    text-rendering: optimizeLegibility !important;
    -webkit-font-smoothing: antialiased !important;
}

body.light {
    color: var(--black-light);
}

h1 {
    font-family: 'Muli', sans-serif;
    font-size: 12vw;
    font-weight: 900;
    line-height: 1;
    color: var(--white);
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

body.light h1 {
    color: var(--black);
}

body.light {
    background-color: var(--white);
}

.navbar-brand {
    height: 36px;
    position: fixed;
    top: 50px;
    left: 70px;
    z-index: 3333;
    width: auto;
    display: inline-block;
    margin: 0;
    padding: 0;
    -webkit-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}

.navbar-brand::before {
    position: absolute;
    content: '';
    top: -13px;
    left: 50%;
    width: 80px;
    transform: translateX(-50%);
    height: calc(100% + 26px);
    opacity: 0;
    z-index: -1;
    background-image: linear-gradient(260deg, var(--grey), var(--grey-light));
    animation: border-transform 10s linear infinite alternate forwards;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.navbar-brand::after {
    position: absolute;
    content: '';
    top: -13px;
    left: 50%;
    width: 80px;
    transform: translateX(-50%);
    height: calc(100% + 26px);
    opacity: 1;
    z-index: -1;
    background-image: linear-gradient(160deg, var(--black-blue-light-3), var(--black-blue-light));
    animation: border-transform 10s linear infinite alternate forwards;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.navbar-brand img {
    padding: 7px 0;
    height: 100%;
    width: auto;
    display: block;
    -webkit-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}

@-webkit-keyframes border-transform {
    0%,
    100% {
        border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%;
    }
    14% {
        border-radius: 40% 60% 54% 46% / 49% 60% 40% 51%;
    }
    28% {
        border-radius: 54% 46% 38% 62% / 49% 70% 30% 51%;
    }
    42% {
        border-radius: 61% 39% 55% 45% / 61% 38% 62% 39%;
    }
    56% {
        border-radius: 61% 39% 67% 33% / 70% 50% 50% 30%;
    }
    70% {
        border-radius: 50% 50% 34% 66% / 56% 68% 32% 44%;
    }
    84% {
        border-radius: 46% 54% 50% 50% / 35% 61% 39% 65%;
    }
}

@keyframes border-transform {
    0%,
    100% {
        border-radius: 63% 37% 54% 46% / 55% 48% 52% 45%;
    }
    14% {
        border-radius: 40% 60% 54% 46% / 49% 60% 40% 51%;
    }
    28% {
        border-radius: 54% 46% 38% 62% / 49% 70% 30% 51%;
    }
    42% {
        border-radius: 61% 39% 55% 45% / 61% 38% 62% 39%;
    }
    56% {
        border-radius: 61% 39% 67% 33% / 70% 50% 50% 30%;
    }
    70% {
        border-radius: 50% 50% 34% 66% / 56% 68% 32% 44%;
    }
    84% {
        border-radius: 46% 54% 50% 50% / 35% 61% 39% 65%;
    }
}

body.light .navbar-brand::before {
    opacity: 1;
}

body.light .navbar-brand::after {
    opacity: 0;
}

.section {
    position: relative;
    width: 100%;
    display: block;
    overflow: hidden;
    height: 100vh;
}

.center-wrap {
    position: absolute;
    width: 100%;
    display: block;
    overflow: hidden;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

.color-gradient-red-yellow {
    background: linear-gradient(160deg, var(--red), var(--yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.color-gradient-red-yellow .uil:before {
    background: linear-gradient(160deg, var(--red), var(--yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.size-22 {
    font-size: 22px;
}

/* totop按钮 ================================================== */

.progress-wrap {
    position: fixed;
    right: 50px;
    bottom: 50px;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    border-radius: 50px;
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.2);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.progress-wrap.active-progress {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.progress-wrap::after {
    position: absolute;
    font-family: 'unicons';
    content: '↑';
    text-align: center;
    line-height: 46px;
    font-size: 24px;
    color: var(--grey);
    left: 0;
    top: 0;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    z-index: 1;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.progress-wrap:hover::after {
    opacity: 0;
}

.progress-wrap::before {
    position: absolute;
    font-family: 'unicons';
    content: '↑';
    text-align: center;
    line-height: 46px;
    font-size: 24px;
    opacity: 0;
    background-image: linear-gradient(298deg, var(--red), var(--yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    left: 0;
    top: 0;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    z-index: 2;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.progress-wrap:hover::before {
    opacity: 1;
}

.progress-wrap svg path {
    fill: none;
}

.progress-wrap svg.progress-circle path {
    stroke: var(--grey);
    stroke-width: 4;
    box-sizing: border-box;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

body.light .progress-wrap {
    box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.2);
}

body.light .progress-wrap::after {
    color: var(--black-blue);
}

body.light .progress-wrap svg.progress-circle path {
    stroke: var(--black-blue);
}

.switch,
.circle {
    -webkit-transition: all 300ms linear;
    transition: all 300ms linear;
}

.switch {
    width: 80px;
    height: 4px;
    border-radius: 27px;
    background-image: linear-gradient(298deg, var(--red), var(--yellow));
    position: fixed;
    left: 50px;
    top: 75px;
    display: block;
    margin: 0 auto;
    text-align: center;
    opacity: 1;
    z-index: 33333;
    transition: all 300ms linear;
}

.circle {
    cursor: pointer;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: -5px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--black-blue-light-3);
    box-shadow: 0 4px 4px rgba(26, 53, 71, 0.25), 0 0 0 1px rgba(26, 53, 71, 0.07);
    animation: border-transform 10s linear infinite alternate forwards;
}

.circle:hover {
    box-shadow: 0 8px 8px rgba(26, 53, 71, 0.25), 0 0 0 1px rgba(26, 53, 71, 0.07);
}

.circle:before {
    position: absolute;
    font-family: 'unicons';
    content: '🌙';
    top: 0;
    left: 0;
    z-index: 2;
    font-size: 20px;
    line-height: 40px;
    text-align: center;
    width: 100%;
    height: 40px;
    opacity: 1;
    color: var(--grey);
    -webkit-transition: all 300ms linear;
    transition: all 300ms linear;
}

.circle:after {
    position: absolute;
    font-family: 'unicons';
    content: '🌞';
    top: 0;
    left: 0;
    z-index: 2;
    font-size: 20px;
    line-height: 40px;
    text-align: center;
    width: 100%;
    height: 40px;
    color: var(--yellow);
    opacity: 0;
    -webkit-transition: all 300ms linear;
    transition: all 300ms linear;
}

.switched {}

.switched .circle {
    left: 45px;
    box-shadow: 0 4px 4px rgba(26, 53, 71, 0.25), 0 0 0 1px rgba(26, 53, 71, 0.07);
    background: var(--black-blue);
}

.switched .circle:hover {
    box-shadow: 0 8px 8px rgba(26, 53, 71, 0.25), 0 0 0 1px rgba(26, 53, 71, 0.07);
}

.switched .circle:before {
    opacity: 0;
}

.switched .circle:after {
    opacity: 1;
}