books/theme/css/chrome.css

/* CSS for UI elements (a.k.a. chrome) */

@import 'variables.css';

::-webkit-scrollbar {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar);
}
html {
    scrollbar-color: var(--scrollbar) var(--bg);
}
#mdbook-searchresults a,
.content a:link,
a:visited,
a > .hljs {
    color: var(--links);
}

/* Menu Bar */

#mdbook-menu-bar,
#mdbook-menu-bar-hover-placeholder {
    z-index: 101;
    margin: auto calc(0px - var(--page-padding));
}
#mdbook-menu-bar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    background-color: var(--bg);
    border-bottom-color: var(--bg);
    border-bottom-width: 1px;
    border-bottom-style: solid;
}
#mdbook-menu-bar.sticky,
.js #mdbook-menu-bar-hover-placeholder:hover + #mdbook-menu-bar,
.js #mdbook-menu-bar:hover,
.js.sidebar-visible #mdbook-menu-bar {
    position: -webkit-sticky;
    position: sticky;
    top: 0 !important;
}
#mdbook-menu-bar-hover-placeholder {
    position: sticky;
    position: -webkit-sticky;
    top: 0;
    height: var(--menu-bar-height);
}
#mdbook-menu-bar.bordered {
    border-bottom-color: var(--table-border-color);
}
#mdbook-menu-bar i, #mdbook-menu-bar .icon-button {
    position: relative;
    padding: 0 8px;
    z-index: 10;
    line-height: var(--menu-bar-height);
    cursor: pointer;
    transition: color 0.5s;
}
@media only screen and (max-width: 420px) {
    #mdbook-menu-bar i, #mdbook-menu-bar .icon-button {
        padding: 0 5px;
    }
}

.icon-button {
    border: none;
    background: none;
    padding: 0;
    color: inherit;
}
.icon-button i {
    margin: 0;
}

.right-buttons {
    margin: 0 15px;
}
.right-buttons a {
    text-decoration: none;
}

.left-buttons {
    display: flex;
    margin: 0 5px;
}
.no-js .left-buttons {
    display: none;
}

.menu-title {
    display: inline-block;
    font-weight: 200;
    font-size: 2.4rem;
    line-height: var(--menu-bar-height);
    text-align: center;
    margin: 0;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.js .menu-title {
    cursor: pointer;
}

.menu-bar,
.menu-bar:visited,
.nav-chapters,
.nav-chapters:visited,
.mobile-nav-chapters,
.mobile-nav-chapters:visited,
.menu-bar .icon-button,
.menu-bar a i {
    color: var(--icons);
}

.menu-bar i:hover,
.menu-bar .icon-button:hover,
.nav-chapters:hover,
.mobile-nav-chapters i:hover {
    color: var(--icons-hover);
}

/* Nav Icons */

.nav-chapters {
    font-size: 2.5em;
    text-align: center;
    text-decoration: none;

    position: fixed;
    top: 0;
    bottom: 0;
    margin: 0;
    max-width: 150px;
    min-width: 90px;

    display: flex;
    justify-content: center;
    align-content: center;
    flex-direction: column;

    transition: color 0.5s, background-color 0.5s;
}

.nav-chapters:hover {
    text-decoration: none;
    background-color: var(--theme-hover);
    transition: background-color 0.15s, color 0.15s;
}

.nav-wrapper {
    margin-top: 50px;
    display: none;
}

.mobile-nav-chapters {
    font-size: 2.5em;
    text-align: center;
    text-decoration: none;
    width: 90px;
    border-radius: 5px;
    background-color: var(--sidebar-bg);
}

.previous {
    float: left;
}

.next {
    float: right;
    right: var(--page-padding);
}

@media only screen and (max-width: 1080px) {
    .nav-wide-wrapper { display: none; }
    .nav-wrapper { display: block; }
}

@media only screen and (max-width: 1380px) {
    .sidebar-visible .nav-wide-wrapper { display: none; }
    .sidebar-visible .nav-wrapper { display: block; }
}

/* Inline code */

:not(pre) > .hljs {
    display: inline;
    padding: 0.1em 0.3em;
    border-radius: 3px;
}

:not(pre):not(a) > .hljs {
    color: var(--inline-code-color);
    overflow-x: initial;
}

a:hover > .hljs {
    text-decoration: underline;
}

pre {
    position: relative;
}
pre > .buttons {
    position: absolute;
    z-index: 100;
    right: 5px;
    top: 5px;

    color: var(--sidebar-fg);
    cursor: pointer;
}
pre > .buttons :hover {
    color: var(--sidebar-active);
}
pre > .buttons i {
    margin-left: 8px;
}
pre > .buttons button {
    color: inherit;
    background: transparent;
    border: none;
    cursor: inherit;
}
pre > .result {
    margin-top: 10px;
}

/* Search */

#mdbook-searchresults a {
    text-decoration: none;
}

mark {
    border-radius: 2px;
    padding: 0 3px 1px 3px;
    margin: 0 -3px -1px -3px;
    background-color: var(--search-mark-bg);
    transition: background-color 300ms linear;
    cursor: pointer;
}

mark.fade-out {
    background-color: rgba(0,0,0,0) !important;
    cursor: auto;
}

.searchbar-outer {
    margin-left: auto;
    margin-right: auto;
    max-width: var(--content-max-width);
}

/* mdBook 0.5 搜索框：内层容器与加载指示器 */
.search-wrapper {
    position: relative;
}

#mdbook-searchbar-outer.searching #mdbook-searchbar {
    padding-right: 30px;
}
#mdbook-searchbar-outer .spinner-wrapper {
    display: none;
}
#mdbook-searchbar-outer.searching .spinner-wrapper {
    display: block;
}

.spinner-wrapper {
    --spinner-margin: 2px;
    position: absolute;
    margin-block-start: calc(var(--searchbar-margin-block-start) + var(--spinner-margin));
    right: var(--spinner-margin);
    top: 0;
    bottom: var(--spinner-margin);
    padding: 6px;
    background-color: var(--bg);
}

#fa-spin {
    animation: rotating 2s linear infinite;
    display: inline-block;
}

@keyframes rotating {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

#mdbook-searchbar {
    width: 100%;
    margin: 5px auto 0px auto;
    padding: 10px 16px;
    transition: box-shadow 300ms ease-in-out;
    border: 1px solid var(--searchbar-border-color);
    border-radius: 3px;
    background-color: var(--searchbar-bg);
    color: var(--searchbar-fg);
}
#mdbook-searchbar:focus,
#mdbook-searchbar.active {
    box-shadow: 0 0 3px var(--searchbar-shadow-color);
}

.searchresults-header {
    font-weight: bold;
    font-size: 1em;
    padding: 18px 0 0 5px;
    color: var(--searchresults-header-fg);
}

.searchresults-outer {
    margin-left: auto;
    margin-right: auto;
    max-width: var(--content-max-width);
    border-bottom: 1px dashed var(--searchresults-border-color);
}

ul#mdbook-searchresults {
    list-style: none;
    padding-left: 20px;
}
ul#mdbook-searchresults li {
    margin: 10px 0px;
    padding: 2px;
    border-radius: 2px;
}
ul#mdbook-searchresults li.focus {
    background-color: var(--searchresults-li-bg);
}
ul#mdbook-searchresults span.teaser {
    display: block;
    clear: both;
    margin: 5px 0 0 20px;
    font-size: 0.8em;
}
ul#mdbook-searchresults span.teaser em {
    font-weight: bold;
    font-style: normal;
}

/* Sidebar */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    font-size: 0.875em;
    box-sizing: border-box;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-fg);
}
.sidebar-resizing {
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
.js:not(.sidebar-resizing) .sidebar {
    transition: transform 0.3s; /* Animation: slide away */
}
.sidebar code {
    line-height: 2em;
}
.sidebar .sidebar-scrollbox {
    overflow-y: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 10px 10px;
}
/* mdBook 0.5：拖拽热区贴在侧边栏右缘外侧，配合 .sidebar-resize-indicator 显示拖拽提示 */
.sidebar .sidebar-resize-handle {
    position: absolute;
    cursor: col-resize;
    width: 0;
    right: calc(var(--sidebar-resize-indicator-width) * -1);
    top: 0;
    bottom: 0;
    display: flex;
    align-items: center;
}
.sidebar-resize-handle .sidebar-resize-indicator {
    width: 100%;
    height: 16px;
    color: var(--icons);
    margin-inline-start: var(--sidebar-resize-indicator-space);
    display: flex;
    align-items: center;
    justify-content: flex-start;
}
.sidebar-resize-handle .sidebar-resize-indicator::before {
    content: "";
    width: 2px;
    height: 12px;
    border-left: dotted 2px currentColor;
}
.sidebar-resize-handle .sidebar-resize-indicator::after {
    content: "";
    width: 2px;
    height: 16px;
    border-left: dotted 2px currentColor;
}
.js .sidebar .sidebar-resize-handle {
    cursor: col-resize;
    width: calc(var(--sidebar-resize-indicator-width) - var(--sidebar-resize-indicator-space));
}
.sidebar-hidden .sidebar {
    transform: translateX(calc(0px - var(--sidebar-width)));
}
.sidebar::-webkit-scrollbar {
    background: var(--sidebar-bg);
}
.sidebar::-webkit-scrollbar-thumb {
    background: var(--scrollbar);
}

.sidebar-visible .page-wrapper {
    transform: translateX(var(--sidebar-width));
}
@media only screen and (min-width: 620px) {
    .sidebar-visible .page-wrapper {
        transform: none;
        margin-left: var(--sidebar-width);
    }
}

.chapter {
    list-style: none outside none;
    padding-left: 0;
    line-height: 2.2em;
}

.chapter ol {
    width: 100%;
}

.chapter li {
    color: var(--sidebar-non-existant);
}

/* mdBook 0.5：链接与折叠箭头由一个 span 包裹，靠它做 flex 布局 */
.chapter li > .chapter-link-wrapper {
    display: flex;
}
.chapter li a {
    display: block;
    padding: 0;
    text-decoration: none;
    color: var(--sidebar-fg);
}

.chapter li a:hover {
    color: var(--sidebar-active);
}

.chapter li a.active {
    color: var(--sidebar-active);
}

/* mdBook 0.5：折叠箭头在 .chapter-link-wrapper 内，不是 li 的直接子 */
.chapter .chapter-link-wrapper > a.chapter-fold-toggle {
    cursor: pointer;
    display: block;
    margin-left: auto;
    padding: 0 10px;
    user-select: none;
    opacity: 0.68;
}

.chapter .chapter-link-wrapper > a.chapter-fold-toggle div {
    transition: transform 0.5s;
}

/* collapse the section（0.5：子目录 ol 与折叠按钮同在一个 li 内） */
.chapter li:not(.expanded) > ol.section {
    display: none;
}

.chapter li.chapter-item {
    line-height: 1.5em;
    margin-top: 0.6em;
}

.chapter li.expanded > .chapter-link-wrapper > a.chapter-fold-toggle div {
    transform: rotate(90deg);
}

.spacer {
    width: 100%;
    height: 3px;
    margin: 5px 0px;
}
.chapter .spacer {
    background-color: var(--sidebar-spacer);
}

@media (-moz-touch-enabled: 1), (pointer: coarse) {
    .chapter li a { padding: 5px 0; }
    .spacer { margin: 10px 0; }
}

.section {
    list-style: none outside none;
    padding-left: 20px;
    line-height: 1.9em;
}

/* Theme Menu Popup */

.theme-popup {
    position: absolute;
    left: 10px;
    top: var(--menu-bar-height);
    z-index: 1000;
    border-radius: 4px;
    font-size: 0.7em;
    color: var(--fg);
    background: var(--theme-popup-bg);
    border: 1px solid var(--theme-popup-border);
    margin: 0;
    padding: 0;
    list-style: none;
    display: none;
}
.theme-popup .default {
    color: var(--icons);
}
.theme-popup .theme {
    width: 100%;
    border: 0;
    margin: 0;
    padding: 2px 10px;
    line-height: 25px;
    white-space: nowrap;
    text-align: left;
    cursor: pointer;
    color: inherit;
    background: inherit;
    font-size: inherit;
}
.theme-popup .theme:hover {
    background-color: var(--theme-hover);
}
.theme-popup .theme:hover:first-child,
.theme-popup .theme:hover:last-child {
    border-top-left-radius: inherit;
    border-top-right-radius: inherit;
}
/* mdBook 0.5：当前主题在菜单里打勾 */
.theme-selected::before {
    display: inline-block;
    content: "✓";
    margin-inline-start: -14px;
    width: 14px;
}

/* mdBook 0.5：键盘快捷键帮助弹层（按 ? 触发） */
#mdbook-help-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    background: var(--overlay-bg);
}

#mdbook-help-popup {
    box-shadow: 0 4px 24px rgba(0,0,0,0.15);
    min-width: 300px;
    max-width: 500px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--bg);
    color: var(--fg);
    border-width: 1px;
    border-color: var(--theme-popup-border);
    border-style: solid;
    border-radius: 8px;
    padding: 10px;
}

.mdbook-help-title {
    text-align: center;
    margin: 10px;
}