:root {
    color: #555;

    --green: #158e23;
    --primary: var(--green);

    --shadow: 0 0 5em rgba(0, 0, 0, .1);
    --shadow-thin: 0 0 1em rgba(0, 0, 0, .3);
    --shadow-thick: 0 0 5em rgba(0, 0, 0, .2);

    --input-bg: #fff;
    --search-bg: #fff;
    --secondly-input-bg: rgba(0, 0, 0, .05);

    /* 和背景主体反过来的字体颜色 */
    --font-color: #333;
    --font-shadow: 0 0 5px #fff, 0 2px 5px #fff;
}

@media screen and (prefers-color-scheme: dark) {
    :root {
        color: #ccc;
        background-color: #222;

        --gray: #555;
        --shadow: 0 0 5em rgba(255, 255, 255, .1);
        --shadow-thin: 0 0 1em rgba(255, 255, 255, .3);
        --shadow-thick: 0 0 5em rgba(255, 255, 255, .2);

        --input-bg: #222;
        --search-bg: rgba(255, 255, 255, .2);
        --secondly-input-bg: rgba(255, 255, 255, .2);

        --font-color: #eee;
        --font-shadow: 0 0 5px #000, 0 2px 5px #000;
    }

    blockquote {
        background-color: var(--secondly-input-bg);
    }
}

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
}

body.dark {
    color: #fff;

    --font-shadow: 0 0 5px #000, 0 2px 5px #000;
}

.iconfont {
    font: inherit;
}

h3 {
    font-weight: lighter;
}

article h3 {
    margin-top: 2em
}

article h3:first-child {
    margin-top: 0
}

article img {
    border-radius: 1em
}

.btn {
    transition: opacity .3s, box-shadow .3s;
}

.btn:active {
    opacity: .9;
}

.btn.primary {
    color: #fff;
    background-color: var(--primary);
}

.btn-group {
    gap: .5em;
    display: flex;
    flex-wrap: wrap;
}

/*
  页眉
*/
header {
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
    display: flex;
    padding: 1em 0;
    position: fixed;
    justify-content: flex-end;
}

header .action-btn {
    padding: 0 1em;
    cursor: pointer;
}

header .action-btn .fa {
    font-size: 1.5em;
    transition: transform .3s;
    text-shadow: var(--font-shadow);
}

header .action-btn:hover .fa {
    transform: scale(1.2);
}

header .action-btn.updated.active .fa {
    animation: shiny .5s alternate infinite;
}

@keyframes shiny {
    from {
        opacity: 0
    }
    to {
        opacity: 1
    }
}

/*
  内容
*/
main {
    width: 100%;
    margin: auto;
    padding: 5em 1.75em;
    max-width: 60em;
}

.input-box {
    display: flex;
    color: var(--font-color);
    position: relative;
    padding: .5em 1em;
    border-radius: 3em;
    background-color: #fff;
    background-color: var(--search-bg);
    box-shadow: 0 0 5px 0 rgba(0, 0, 0, .2);
    box-shadow: var(--shadow);
    transition: box-shadow .3s;
}

.input-box:hover {
    box-shadow: var(--shadow-thick);
}

@media screen and (prefers-color-scheme: dark) {
    .input-box input::-webkit-input-placeholder {
        color: inherit;
    }

    .input-box input:-ms-input-placeholder {
        color: inherit;
    }

    .input-box input::placeholder {
        color: inherit;
    }

    .navi-icon {
        filter: brightness(.7);
    }
}

.input-box input {
    flex: 1 1 auto;
    max-width: 100%;
    border-radius: 0;
    border: none;
    margin: 0 1em;
    background-color: transparent;
}

.navi-items {
    display: grid;
    grid-gap: 2em;
    text-align: center;
    grid-template-columns: repeat(auto-fill, minmax(5em, 1fr));
}

@media screen and (max-width: 768px) {
    .navi-items {
        grid-gap: 2em 1.5em;
        grid-template-columns: repeat(auto-fill, minmax(4em, 1fr));
    }
}

.navi-items .item {
    z-index: 1;
    color: inherit;
    display: block;
}

.navi-search {
    margin-bottom: 5em;
}

.search-select {
    cursor: pointer;
}

.search-select .iconfont {
    font-size: 1.5em;
    line-height: 2.5rem;
    pointer-events: none;
}

.search-selector {
    top: 3em;
    z-index: 2;
    opacity: 0;
    padding: .75em 0;
    overflow: hidden;
    visibility: hidden;
    position: absolute;
    background-color: #fff;
    background-color: var(--input-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transform: scale(1, 0);
    transform-origin: top center;
    transition: opacity .3s, transform .3s, visibility .3s;
}

.search-selector.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.search-selector .iconfont {
    opacity: .5;
    margin-right: .75em;
}

.search-selector .item {
    cursor: pointer;
    padding: .5em 1em;
    transition: color .3s, background-color .3s;
}

.search-selector .item:hover {
    color: #fff;
    background-color: #3498db;
    background-color: var(--primary);
}

.navi-icon {
    color: #fff;
    background-color: #666;

    width: 5rem;
    height: 5rem;
    font-size: 1.75em;
    line-height: 5rem;

    margin: auto;
    overflow: hidden;
    border-radius: 2em;
    transition: box-shadow .3s;
}

.navi-icon i {
    display: inline-block;
    transition: transform .3s;
}

.navi-icon:hover i {
    transform: scale(1.3);
}

.navi-icon img {
    vertical-align: top
}

.navi-title {
    text-shadow: var(--font-shadow);
    padding: 0 .5em;
    font-size: .875em;
    margin-top: .75em;
}

@media screen and (max-width: 768px) {
    .navi-icon {
        width: 3.75rem;
        height: 3.75rem;
        font-size: 1.3em;
        line-height: 3.75rem;
    }
}

.navi-background {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    z-index: -1;
    position: fixed;
    transition: opacity .5s;
}

.navi-background.active {
    opacity: 1;
}

@media screen and (prefers-color-scheme: dark) {
    /* 随机动漫壁纸需要滤镜隐藏 */
    .navi-background.type-1 {
        mix-blend-mode: multiply;
    }

    /* 必应壁纸需要低透明度 */
    .navi-background.type-2.active {
        opacity: .2;
    }
}

/*
  页尾
*/
footer {
    left: 0;
    right: 0;
    bottom: 0;
    text-shadow: var(--font-shadow);
    padding: 1em 0;
    position: fixed;
    font-size: .875em;
    text-align: center;
}

footer a {
    color: inherit;
}

@media screen and (max-width: 600px) {
    footer {
        position: static;
    }
}

/*
  弹窗和抽屉
*/
window {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    z-index: 1;
    display: flex;
    position: fixed;
    padding: 2em 1em;
    pointer-events: none;
    color: var(--font-color);
    background: rgba(0, 0, 0, .3);
    transition: opacity .3s;
}

body:not(.low-animate) window {
    backdrop-filter: blur(5px);
    --webkit-backdrop-filter: blur(5px);
}

@media screen and (prefers-color-scheme: dark) {
    window {
        background: rgba(255, 255, 255, .1);
    }
}

window.active {
    opacity: 1;
    pointer-events: auto;
}

.the-window {
    margin: auto;
    display: none;
    min-width: 15em;
    max-width: 40em;
    background: #fff;
    background: var(--input-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-thick);
}

.the-window.active {
    display: block;
}

.the-window.started {
    animation: fade-small-large .3s forwards;
}

.the-window.closed {
    animation: fade-large-small .3s forwards;
}

/* 减淡动画 */
body.low-animate .the-window.started {
    animation-name: fade-in;
}

body.low-animate .the-window.closed {
    animation-name: fade-out;
}

.the-window.updated {
    width: 100%
}

.the-window.updated details {
    margin-top: 3em;
}

.the-window.updated details:first-child {
    margin-top: 0;
}

.the-window.updated summary {
    font-size: 1.2em;
    font-weight: lighter;
}

.the-window.updated details[open] summary {
    margin-bottom: 1em;
}

.the-window .window-head, .the-drawer .drawer-head {
    user-select: none;
    padding: 1em 1.5em;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow);
}

.the-window .window-head button, .the-drawer .drawer-head button {
    top: 1rem;
    right: 1rem;
    position: absolute;

    border: none;
    color: #fff;
    padding: 0;
    width: 1.5em;
    cursor: pointer;
    font-size: 1.17em;
    border-radius: 1em;
    background: rgb(255, 86, 86);
}

.the-window .window-body, .the-drawer .drawer-body {
    padding: 1.25em;
    overflow: auto;
    max-height: 80vh;
}

.the-window .window-body::-webkit-scrollbar,
.the-drawer .drawer-body::-webkit-scrollbar {
    width: 6px;
}

.the-drawer {
    top: 0;
    right: 0;
    bottom: 0;
    position: fixed;

    display: flex;
    flex-direction: column;

    width: 100%;
    max-width: 25em;
    transform: translateX(100%);
    transition: opacity .3s, transform .3s, visibility .3s;
    background: var(--input-bg);
    box-shadow: var(--shadow-thick);
}

.the-drawer.active {
    transform: translateX(0);
}

.the-drawer.closed {
    transform: translateX(100%);
}

/* 减淡动画 */
body.low-animate .the-drawer {
    opacity: 0;
    transform: none;
    visibility: hidden;
}

body.low-animate .the-drawer.active {
    opacity: 1;
    visibility: visible;
}

.the-drawer .drawer-body {
    max-height: none;
}

.the-drawer.sites .sites {
    gap: .5em;
    display: grid;
    user-select: none;
    margin-bottom: 3em;
    grid-template-columns: repeat(auto-fill, minmax(7em, 1fr));
}

.the-drawer.sites .sites span {
    padding: .75em;
    cursor: pointer;
    border-radius: var(--radius);
    background-color: rgba(0, 0, 0, .05);
    background-color: var(--secondly-input-bg);
    transition: transform .3s;
}

.the-drawer.sites .sites span:active {
    transform: scale(.9);
}

.the-drawer.sites .sites span.active {
    color: #fff;
    background-color: var(--primary);
}

.the-drawer.sites .add-sites {
    opacity: .6;
    font-size: .875em;
    text-align: center;
}