web/_sass/addon/commons.scss

/*
  The common styles
*/
@import url('https://fonts.googleapis.com/css2?family=Lato&family=Source+Sans+Pro:wght@400;600;900&display=swap');

@mixin mode-toggle($dark-mode: false) {
  @if $dark-mode {
    @include dark-scheme;
  } @else {
    @include light-scheme;
  }
}

html:not([mode]),
html[mode=light] {
  @include mode-toggle();
}

html[mode=dark] {
  @include mode-toggle(true);
}

@media (prefers-color-scheme: dark) {
  html:not([mode]),
  html[mode=dark] {
    @include mode-toggle(true);
  }

  html[mode=light] {
    @include mode-toggle();
  }
}

:root {
  font-size: 16px;
}

body {
  line-height: 1.75rem;
  background: var(--body-bg);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  font-family: 'Source Sans Pro', 'Microsoft Yahei', sans-serif;
}

/* --- Scrollbar --- */

$scrollbar-size: 7px;

::-webkit-scrollbar {
  width: $scrollbar-size;
  height: $scrollbar-size;
}

::-webkit-scrollbar-track {
  @at-root body#{&} {
    -webkit-box-shadow: inset 0 0 6px var(--scrollbar-track-bg);
  }
}

::-webkit-scrollbar-thumb {
  background-color: var(--scrollbar-thumb-bg);
  border-radius: calc(#{$scrollbar-size} / 2);
}

.highlight {
  border-color: transparent;
  transition: border-color 0.5s ease;

  &:hover {
    border-color: var(--scrollbar-thumb-bg);
    transition: border-color 0.2s ease;
  }

  &::-webkit-scrollbar-thumb {
    /* add border to act as background-color */
    border-right-style: inset;
    border-right-width: calc(100vw + 100vh);
    border-color: inherit;
    background-color: var(--highlight-bg-color);
  }

}

/* --- Typography --- */

h1 {
  @extend %heading;

  font-size: 1.8rem;
}

h2 {
  @extend %heading;
  @extend %section;
  @extend %anchor;

  font-size: 1.4rem;
}

h3 {
  @extend %heading;
  @extend %section;
  @extend %anchor;

  font-size: 1.25rem;
}

h4 {
  @extend %heading;
  @extend %section;
  @extend %anchor;

  font-size: 1.15rem;
}

h5 {
  @extend %heading;
  @extend %section;
  @extend %anchor;

  font-size: 1.1rem;
}

ol,
ul {
  ol,
  ul {
    margin-bottom: 1rem;
  }
}

a {
  @extend %link-color;
}

img {
  max-width: 100%;
  height: auto;
}

blockquote {
  border-left: 5px solid var(--blockquote-border-color);
  padding-left: 1rem;
  color: var(--blockquote-text-color);
}

kbd {
  margin: 0 0.3rem;
}

footer {
  position: absolute;
  bottom: 0;
  padding: 0 1rem;
  height: $footer-height;
  font-size: 0.8rem;
  color: #7a7b7d;
  background-color: var(--footer-bg-color);

  > div.d-flex {
    line-height: 1.2rem;
    width: 95%;
    max-width: 1045px;
    border-top: 1px solid var(--main-border-color);
    margin-bottom: 1rem;

    > div {
      width: 350px;
    }
  }

  a {
    color: var(--footer-link);

    &:link {
      @include no-text-decoration;
    }

    &:hover {
      @extend %link-hover;

      @include no-text-decoration;
    }
  }

  .footer-right {
    text-align: right;
  }
}

/* --- Panels --- */

.access {
  top: 2rem;
  transition: top 0.2s ease-in-out;
  margin-right: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 4rem;

  &:only-child {
    position: -webkit-sticky; /* Safari */
    position: sticky;
  }

  &.topbar-down {
    top: 6rem;
  }

  > div {
    padding-left: 1rem;
    border-left: 1px solid var(--main-border-color);

    &:not(:last-child) {
      margin-bottom: 4rem;
    }
  }

  span {
    @include panel-label;
  }

  .post-content {
    font-size: 0.9rem;
  }

}

#access-tags {
  > div.post-content > div {
    max-width: 80%;
  }

  .post-tag {
    display: inline-block;
    line-height: 1rem;
    font-size: 0.85rem;
    background: none;
    border: 1px solid var(--btn-border-color);
    border-radius: 0.8rem;
    padding: 0.3rem 0.5rem;
    margin: 0 0.35rem 0.5rem 0;

    &:hover {
      background-color: #2a408e;
      border-color: #2a408e;
      color: #fff;
      transition: none;
    }
  }
}

#access-lastmod {
  li {
    height: 1.8rem;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    list-style: none;
  }

  a {
    &:hover {
      @extend %link-hover;
    }

    @extend %no-bottom-border;

    color: inherit;
  }

}

.footnotes > ol {
  padding-left: 2rem;
  margin-top: 0.5rem;

  > li {
    &:not(:last-child) {
      margin-bottom: 0.3rem;
    }

    > p {
      margin-left: 0.25em;
      margin-top: 0;
      margin-bottom: 0;
    }

    // [scroll-focus] added by `smooth-scroll.js`
    &:target:not([scroll-focus]),
    &[scroll-focus=true] > p {
      background-color: var(--footnote-target-bg);
      width: fit-content;
      -webkit-transition: background-color 1.5s ease-in-out; // Safari prior 6.1
      transition: background-color 1.5s ease-in-out;
    }
  }
}

.footnote {
  @at-root a#{&} {
    @include ml-mr(1px);
    @include pl-pr(2px);

    border-bottom-style: none !important;
    -webkit-transition: background-color 1.5s ease-in-out; // Safari prior 6.1
    transition: background-color 1.5s ease-in-out;
  }

  // [scroll-focus] added by `smooth-scroll.js`
  @at-root sup:target:not([scroll-focus]),
  sup[scroll-focus=true] > a#{&} {
    background-color: var(--footnote-target-bg);
  }
}

.reversefootnote {
  @at-root a#{&} {
    font-size: 0.6rem;
    line-height: 1;
    position: relative;
    bottom: 0.25em;
    margin-left: 0.25em;
    border-bottom-style: none !important;
  }
}

.post {
  h1 {
    margin-top: 3rem;
    margin-bottom: 1rem;
  }

  em { /* MarkDown italic */
    padding-right: 0.2rem;
  }

  a:hover {
    code {
      @extend %link-hover;
    }
  }
}

/* --- Begin of Markdown table style --- */

.table-wrapper { // it will be created by Liquid
  overflow-x: auto;
  margin-bottom: 1.5rem;

  > table {
    min-width: 100%;
    overflow-x: auto;
    border-spacing: 0;

    thead {
      border-bottom: solid 2px rgba(210, 215, 217, 0.75);

      th {
        @extend %table-cell;
      }
    }

    tbody {
      tr {
        border-bottom: 1px solid var(--tb-border-color);

        &:nth-child(2n) {
          background-color: var(--tb-even-bg);
        }

        &:nth-child(2n + 1) {
          background-color: var(--tb-odd-bg);
        }

        td {
          @extend %table-cell;
        }
      }
    } // tbody
  }// table
}

/* --- post --- */

.pageviews .fa-spinner {
  font-size: 80%;
}

.post-meta {
  font-size: 0.85rem;
  word-spacing: 1px;

  a {
    @extend %link-color;
    @extend %link-underline;

    &:not(:last-child) {
      margin-right: 2px;
    }

    &:hover {
      @extend %link-hover;
    }
  }
}

.post-content {
  font-size: 1.08rem;
  line-height: 1.8;
  margin-top: 2rem;
  overflow-wrap: break-word;
  word-wrap: break-word;

  @mixin caption {
    + em {
      display: block;
      text-align: center;
      font-style: normal;
      font-size: 80%;
      padding: 0;
      color: #6d6c6c;
    }
  }

  @keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  img[data-src] {
    margin: 0.5rem 0;

    &[data-loaded=true] {
      animation: fade-in linear 0.5s;
    }

    &.left {
      float: left;
      margin: 0.75rem 1rem 1rem 0;
    }

    &.right {
      float: right;
      margin: 0.75rem 0 1rem 1rem;
    }

    &.shadow {
      filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
    }

    @include caption;

  }

  a {
    blockquote & {
      color: var(--link-color);
    }

    &:not(.img-link) {
      @extend %link-color;
      @extend %link-underline;

      &:hover {
        @extend %link-hover;
      }
    }

    &.popup { // created by `_includes/img-extra.html`
      cursor: zoom-in;

      > img[data-src]:not(.normal):not(.left):not(.right) {
        @include align-center;
      }
    }

    &.img-link {
      @include caption;
    }

  } // a

  ul {
    // attribute 'hide-bullet' was added by liquid
    .task-list-item[hide-bullet] {
      list-style-type: none;

      > i { // checkbox icon
        margin: 0 0.4rem 0.2rem -1.4rem;
        vertical-align: middle;
        color: var(--checkbox-color);

        &.checked {
          color: var(--checkbox-checked-color);
        }
      }

    }

    input[type=checkbox] {
      margin: 0 0.5rem 0.2rem -1.3rem;
      vertical-align: middle;
    }

  } // ul

  > ol,
  > ul {
    padding-left: 2rem;

    li {
      ol,
      ul { // sub list
        padding-left: 2rem;
        margin-top: 0.3rem;
      }
    }

  }

  > ol {
    li {
      padding-left: 0.25em;
    }
  }

  dl > dd {
    margin-left: 1rem;
  }

} // .post-content

.tag:hover {
  @extend %tag-hover;
}

.post-tag {
  display: inline-block;
  min-width: 2rem;
  text-align: center;
  background: var(--tag-bg);
  border-radius: 0.3rem;
  padding: 0 0.4rem;
  color: inherit;
  line-height: 1.3rem;

  &:not(:last-child) {
    margin-right: 0.2rem;
  }

  &:hover {
    @extend %tag-hover;

    border-bottom: none;
    text-decoration: none;
    color: #d2603a;
  }
}

/* --- buttons --- */
.btn-lang {
  border: 1px solid !important;
  padding: 1px 3px;
  border-radius: 3px;
  color: var(--link-color);

  &:focus {
    box-shadow: none;
  }
}

/* --- Effects classes --- */

.semi-bold {
  font-weight: 600 !important;
}

.loaded {
  display: block !important;

  @at-root .d-flex#{&} {
    display: flex !important;
  }
}

.unloaded {
  display: none !important;
}

.visible {
  visibility: visible !important;
}

.hidden {
  visibility: hidden !important;
}

.flex-grow-1 {
  -ms-flex-positive: 1 !important;
  flex-grow: 1 !important;
}

.btn-box-shadow {
  box-shadow: 0 0 8px 0 var(--btn-box-shadow) !important;
}

.topbar-up {
  top: -3rem !important; /* same as topbar height. */
}

.no-text-decoration {
  @include no-text-decoration;
}

.tooltip-inner { /* Overrided BS4 Tooltip */
  font-size: 0.7rem;
  max-width: 220px;
  text-align: left;
}

.disabled {
  color: rgb(206, 196, 196);
  pointer-events: auto;
  cursor: not-allowed;
}

.hide-border-bottom {
  border-bottom: none !important;
}

.input-focus {
  box-shadow: none;
  border-color: var(--input-focus-border-color) !important;
  background: center !important;
  transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

/* --- Overriding --- */

// magnific-popup
figure .mfp-title {
  text-align: center;
  padding-right: 0;
  margin-top: 0.5rem;
}

// mermaid
.mermaid {
  text-align: center;
}

/* --- sidebar layout --- */

$sidebar-display: "sidebar-display";

#sidebar {
  @include pl-pr(0);

  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  overflow-y: auto;
  width: $sidebar-width;
  z-index: 99;
  background: var(--sidebar-bg);

  /* Hide scrollbar for Chrome, Safari and Opera */
  &::-webkit-scrollbar {
    display: none;
  }

  /* Hide scrollbar for IE, Edge and Firefox */
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */

  a {
    @extend %sidebar-links;

    &:hover {
      @include no-text-decoration;

      color: var(--sidebar-active-color) !important;
    }
  }

  #avatar {
    > a {
      display: block;
      width: 6rem;
      height: 6rem;
      border-radius: 50%;
      border: 2px solid rgba(222, 222, 222, 0.7);
      overflow: hidden;
      transform: translateZ(0); // fixed the zoom in Safari
      -webkit-transition: border-color 0.35s ease-in-out;
      -moz-transition: border-color 0.35s ease-in-out;
      transition: border-color 0.35s ease-in-out;

      &:hover {
        border-color: white;
      }
    }

    img {
      width: 100%;
      height: 100%;
      -webkit-transition: transform 0.5s;
      -moz-transition: transform 0.5s;
      transition: transform 0.5s;

      &:hover {
        -ms-transform: scale(1.2);
        -moz-transform: scale(1.2);
        -webkit-transform: scale(1.2);
        transform: scale(1.2);
      }
    }
  } // #avatar

  .site-title {
    a {
      @extend %clickable-transition;

      font-weight: 900;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: rgba(134, 133, 133, 99%);
    }
  }

  .site-subtitle {
    font-size: 95%;
    color: var(--sidebar-muted-color);
    line-height: 1.2rem;
    word-spacing: 1px;
    margin: 0.5rem 1.5rem 0.5rem 1.5rem;
    min-height: 3rem; // avoid vertical shifting in multi-line words
    user-select: none;
  }

  .nav-link {
    border-radius: 0;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 1px;
    display: table-cell;
    vertical-align: middle;
  }

  .nav-item {
    text-align: center;
    display: table;
    height: $tab-height;

    &.active {
      .nav-link {
        color: var(--sidebar-active-color);
      }
    }

    &:not(.active) > a {
      @extend %clickable-transition;
    }
  }

  ul {
    height: $tab-height * $tab-count;
    margin-bottom: 2rem;
    padding-left: 0;

    li {
      width: 100%;

      &:last-child {
        a {
          position: relative;
          left: $cursor-width / 2;
          width: 100%;
        }

        &::after { // the cursor
          display: table;
          visibility: hidden;
          content: "";
          position: relative;
          right: 1px;
          width: $cursor-width;
          height: $tab-cursor-height;
          border-radius: 1px;
          background-color: var(--nav-cursor-color);
          pointer-events: none;
        }
      }
    } // li

    @mixin fix-cursor($top) {
      top: $top;
      visibility: visible;
    }

    @for $i from 1 through $tab-count {
      $offset: $tab-count - $i;
      $top: -$offset * $tab-height + ($tab-height - $tab-cursor-height) / 2;

      @if $i < $tab-count {
        > li.active:nth-child(#{$i}),
        > li.nav-item:nth-child(#{$i}):hover {
          ~ li:last-child::after {
            @include fix-cursor($top);
          }
        }
      } @else {
        > li.active:nth-child(#{$i}):last-child::after,
        > li.nav-item:nth-child(#{$i}):last-child:hover::after {
          @include fix-cursor($top);
        }
      }

    } // @for

  } // ul

  .sidebar-bottom {
    font-size: 1.2rem;
    margin-bottom: 2.1rem;

    @include ml-mr(auto);
    @include pl-pr(1rem);

    %icon {
      width: 2.4rem;
      text-align: center;
    }

    a {
      @extend %icon;
      @extend %clickable-transition;
    }

    i {
      line-height: 1.75rem; // default line-height in body
      vertical-align: middle;
    }

    #mode-toggle-wrapper {
      @extend %icon;

      i {
        @extend %sidebar-links;
        @extend %cursor-pointer;
        @extend %clickable-transition;
      }

    }

    .icon-border {
      background-color: var(--sidebar-muted-color);
      content: "";
      width: 3px;
      height: 3px;
      border-radius: 50%;
    }

    #mode-toggle-wrapper:hover > i {
      color: var(--sidebar-active-color);
    }

  } // .sidebar-bottom

} // #sidebar

@media (hover: hover) {
  #sidebar ul > li:last-child::after {
    -webkit-transition: top 0.5s ease;
    -moz-transition: top 0.5s ease;
    -o-transition: top 0.5s ease;
    transition: top 0.5s ease;
  }
}

.profile-wrapper {
  margin-top: 2rem;
  width: 100%;
}

#search-result-wrapper {
  display: none;
  height: 100%;
  overflow: auto;

  .post-content {
    margin-top: 2rem;
  }
}

/* --- top-bar --- */

#topbar-wrapper {
  height: $topbar-height;
  position: fixed;
  top: 0;
  left: $sidebar-width; /* same as sidebar width */
  right: 0;
  transition: top 0.2s ease-in-out;
  z-index: 50;
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  background-color: var(--topbar-wrapper-bg);
}

#topbar {
  i { // icons
    color: #999;
  }

  #breadcrumb {
    font-size: 1rem;
    color: gray;
    padding-left: 0.5rem;

    a:hover {
      @extend %link-hover;
    }

    span {
      &:not(:last-child) {
        &::after {
          content: "›";
          padding: 0 0.3rem;
        }
      }
    }
  }
} // #topbar

#sidebar-trigger,
#search-trigger {
  display: none;
}

#search-wrapper {
  display: flex;
  width: 85%;
  border-radius: 1rem;
  border: 1px solid var(--search-wrapper-border-color);
  background: var(--search-wrapper-bg);
  padding: 0 0.5rem;

  i {
    z-index: 2;
    font-size: 0.9rem;
    color: var(--search-icon-color);
  }

  .fa-times-circle { /* button 'clean up' */
    @extend %cursor-pointer;

    visibility: hidden;
  }
}

#search-cancel { /* 'Cancel' link */
  color: var(--link-color);
  margin-left: 1rem;
  display: none;

  @extend %cursor-pointer;
}

#search-input {
  background: center;
  border: 0;
  border-radius: 0;
  padding: 0.18rem 0.3rem;
  color: var(--text-color);

  &:focus {
    box-shadow: none;
    background: center;

    &.form-control {
      &::-webkit-input-placeholder { @include input-placeholder; }
      &::-moz-placeholder { @include input-placeholder; }
      &:-ms-input-placeholder { @include input-placeholder; }
      &::placeholder { @include input-placeholder; }
    }
  }
}

#search-hints {
  display: none;

  .post-tag {
    display: inline-block;
    line-height: 1rem;
    font-size: 1rem;
    background: var(--search-tag-bg);
    border: none;
    padding: 0.5rem;
    margin: 0 1rem 1rem 0;

    &::before {
      content: "#";
      color: var(--text-muted-color);
      padding-right: 0.2rem;
    }
  }
}

#search-results {
  padding-bottom: 6rem;

  a {
    &:hover {
      @extend %link-hover;
    }

    @extend %link-color;
    @extend %no-bottom-border;
    @extend %heading;

    font-size: 1.4rem;
    line-height: 2.5rem;
  }

  > div {
    width: 100%;

    &:not(:last-child) {
      margin-bottom: 1rem;
    }

    i { // icons
      color: #818182;
      margin-right: 0.15rem;
      font-size: 80%;
    }

    > p {
      overflow: hidden;
      text-overflow: ellipsis;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
    }
  }
} // #search-results

#topbar-title {
  display: none;
  font-size: 1.1rem;
  font-weight: 600;
  font-family: sans-serif;
  color: var(--topbar-text-color);
  text-align: center;
  width: 70%;
  overflow: hidden;
  text-overflow: ellipsis;
  word-break: keep-all;
  white-space: nowrap;
}

#page {
  .categories,
  #tags,
  #archives {
    a:not(:hover) {
      @extend %no-bottom-border;
    }
  }
}

#mask {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 1;

  @at-root [#{$sidebar-display}] & {
    display: block !important;
  }
}

/* --- main wrapper --- */

#main-wrapper {
  background-color: var(--main-wrapper-bg);
  position: relative;
  min-height: 100vh;
  padding-bottom: $footer-height;

  @include pl-pr(0);
}

#main > div.row:first-child > div {
  &:nth-child(1),
  &:nth-child(2) {
    margin-top: $topbar-height; /* same as the height of topbar */
  }

  &:first-child {
    /* 3rem for topbar, 6rem for footer */
    min-height: calc(100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height});
  }
}

#post-wrapper {
  min-height: calc(100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height}) !important;
}

#topbar-wrapper.row,
#main > .row,
#search-result-wrapper > .row {
  @include ml-mr(0);
}

/* --- button back-to-top --- */

#back-to-top {
  $size: 2.7em;

  display: none;
  z-index: 1;
  cursor: pointer;
  position: fixed;
  background: var(--button-bg);
  color: var(--btn-backtotop-color);
  padding: 0;
  width: $size;
  height: $size;
  border-radius: 50%;
  border: 1px solid var(--btn-backtotop-border-color);
  transition: transform 0.2s ease-out;
  -webkit-transition: transform 0.2s ease-out;

  i {
    line-height: $size;
    position: relative;
    bottom: 2px;
  }
}

#back-to-top:hover {
  transform: translate3d(0, -5px, 0);
  -webkit-transform: translate3d(0, -5px, 0);
}

/*
  Responsive Design:

 {sidebar, content, panel} >= 1120px screen width
 {sidebar, content} >= 850px screen width
 {content} <= 849px screen width

*/

@media all and (max-width: 576px) {

  $footer-height: $footer-height-mobile; // overwrite

  #main > div.row:first-child > div:first-child {
    min-height: calc(100vh - #{$topbar-height} - #{$footer-height});
  }

  #post-wrapper {
    min-height: calc(100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height}) !important;

    h1 {
      margin-top: 2.2rem;
      font-size: 1.55rem;
    }
  }

  #avatar > a {
    width: 5rem;
    height: 5rem;
  }

  .site-subtitle {
    @include ml-mr(1.8rem);
  }

  #main-wrapper {
    padding-bottom: $footer-height;
  }

  footer {
    height: $footer-height;

    > div.d-flex {
      width: 100%;
      padding: 1.5rem 0;
      margin-bottom: 0.3rem;
      flex-wrap: wrap;
      -ms-flex-pack: distribute !important;
      justify-content: space-around !important;
    }

    .footer-left,
    .footer-right {
      text-align: center;
    }
  }

}

/* hide sidebar and panel */
@media all and (max-width: 849px) {
  %slide {
    -webkit-transition: transform 0.4s ease;
    transition: transform 0.4s ease;
  }

  html,
  body {
    overflow-x: hidden;
  }

  .footnotes ol > li {
    padding-top: 3.5rem;
    margin-top: -3.2rem;

    &:first-child {
      margin-top: -3.5rem;
    }
  }

  [#{$sidebar-display}] {
    #sidebar {
      transform: translateX(0);
    }

    #topbar-wrapper,
    #main-wrapper {
      transform: translateX(#{$sidebar-width});
    }

  }

  #sidebar {
    @extend %slide;

    transform: translateX(-#{$sidebar-width}); // hide
    -webkit-transform: translateX(-#{$sidebar-width});

    .cursor {
      -webkit-transition: none;
      -moz-transition: none;
      transition: none;
    }
  }

  #main-wrapper {
    @extend %slide;

    padding-top: $topbar-height;
  }

  #search-result-wrapper {
    width: 100%;
  }

  #breadcrumb,
  #search-wrapper {
    display: none;
  }

  #topbar-wrapper {
    @extend %slide;

    left: 0;
  }

  .topbar-up {
    top: 0 !important;
  }

  #main > div.row:first-child > div:nth-child(1),
  #main > div.row:first-child > div:nth-child(2) {
    margin-top: 0;
  }

  #topbar-title,
  #sidebar-trigger,
  #search-trigger {
    display: block;
  }

  #search-wrapper {
    &.loaded ~ a {
      margin-right: 1rem;
    }

    .fa-times-circle {
      right: 5.2rem;
    }
  }

  #search-input {
    margin-left: 0;
    width: 95%;
  }

  #search-result-wrapper .post-content {
    letter-spacing: 0;
  }

  #search-hints {
    display: block;
    padding: 0 1rem;
  }

  #tags {
    -webkit-box-pack: center !important;
    -ms-flex-pack: center !important;
    justify-content: center !important;
  }

  #page h1.dynamic-title {
    display: none;

    ~ .post-content {
      margin-top: 3rem;
    }
  }

} // max-width: 849px

/* Phone & Pad */
@media all and (min-width: 577px) and (max-width: 1199px) {
  footer > .d-flex > div {
    width: 312px;
  }
}

/* Sidebar is visible */
@media all and (min-width: 850px) {
  /* Solved jumping scrollbar */
  html {
    overflow-y: scroll;
  }

  #main-wrapper {
    margin-left: $sidebar-width;
  }

  .profile-wrapper {
    margin-top: 3rem;
  }

  #search-wrapper {
    width: 22%;
    min-width: 150px;
  }

  #search-result-wrapper {
    margin-top: 3rem;
  }

  div.post-content .table-wrapper > table {
    min-width: 70%;
  }

  /* button 'back-to-Top' position */
  #back-to-top {
    bottom: 5.5rem;
    right: 1.2rem;
  }

  .topbar-up {
    box-shadow: none !important;
  }

  #topbar-title {
    text-align: left;
  }

  footer > div.d-flex {
    width: 92%;
  }

}

/* Pad horizontal */
@media all and (min-width: 992px) and (max-width: 1199px) {
  #main .col-lg-11 {
    -webkit-box-flex: 0;
    -ms-flex: 0 0 96%;
    flex: 0 0 96%;
    max-width: 96%;
  }
}

/* Compact icons in sidebar & panel hidden */
@media all and (min-width: 850px) and (max-width: 1199px) {
  #sidebar {
    width: $sidebar-width-small;

    .site-subtitle {
      margin-left: 1rem;
      margin-right: 1rem;
    }

    .sidebar-bottom {
      a,
      span {
        width: 2rem;
      }

      .icon-border {
        left: -3px;
      }
    }
  }

  #topbar-wrapper {
    left: 210px;
  }

  #search-results > div {
    max-width: 700px;
  }

  .site-title {
    font-size: 1.3rem;
    margin-left: 0 !important;
  }

  .site-subtitle {
    @include ml-mr(1rem);

    font-size: 90%;
  }

  #main-wrapper {
    margin-left: 210px;
  }

  #breadcrumb {
    width: 65%;
    overflow: hidden;
    text-overflow: ellipsis;
    word-break: keep-all;
    white-space: nowrap;
  }

}

/* panel hidden */
@media all and (max-width: 1199px) {
  #panel-wrapper {
    display: none;
  }

  #topbar {
    padding: 0;
  }

  #main > div.row {
    -webkit-box-pack: center !important;
    -ms-flex-pack: center !important;
    justify-content: center !important;
  }
}

/* --- desktop mode, both sidebar and panel are visible --- */

@media all and (min-width: 1200px) {
  #main > div.row > div.col-xl-8 {
    -webkit-box-flex: 0;
    -ms-flex: 0 0 75%;
    flex: 0 0 75%;
    max-width: 75%;
    padding-left: 3%;
  }

  #topbar {
    padding: 0;
    max-width: 1070px;
  }

  #panel-wrapper {
    max-width: $panel-max-width;
  }

  #back-to-top {
    bottom: 6.5rem;
    right: 4.3rem;
  }

  #search-input {
    -webkit-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
  }

  #search-results > div {
    width: 46%;

    &:nth-child(odd) {
      margin-right: 1.5rem;
    }

    &:nth-child(even) {
      margin-left: 1.5rem;
    }

    &:last-child:nth-child(odd) {
      position: relative;
      right: 24.3%;
    }
  }

  .post-content {
    font-size: 1.03rem;
  }

  footer > div.d-felx {
    width: 85%;
  }

}

@media all and (min-width: 1400px) {
  #main > div.row {
    padding-left: calc((100% - #{$main-content-max-width}) / 2);

    > div.col-xl-8 {
      max-width: 850px;
    }
  }

  #search-result-wrapper {
    padding-right: 2rem;

    > div {
      max-width: 1110px;
    }
  }

  #search-wrapper .fa-times-circle {
    right: 2.6rem;
  }

}

@media all and (min-width: 1400px) and (max-width: 1650px) {
  #topbar {
    padding-right: 2rem;
  }
}

@media all and (min-width: 1650px) {
  #breadcrumb {
    padding-left: 0;
  }

  #main > div.row > div.col-xl-8 {
    padding-left: 0;

    > div:first-child {
      padding-left: 0.55rem !important;
      padding-right: 1.9rem !important;
    }
  }

  #main-wrapper {
    margin-left: $sidebar-width-large;
  }

  #panel-wrapper {
    margin-left: calc((100% - #{$main-content-max-width}) / 10);
  }

  #topbar-wrapper {
    left: $sidebar-width-large;
  }

  #topbar {
    max-width: #{$main-content-max-width};
  }

  #search-wrapper {
    margin-right: 3%;
  }

  #sidebar {
    width: $sidebar-width-large;

    .profile-wrapper {
      margin-top: 4rem;
      margin-bottom: 1rem;

      &.text-center {
        text-align: left !important;
      }

      %profile-ml {
        margin-left: 4.5rem;
      }

      #avatar {
        @extend %profile-ml;

        > a {
          width: 6.2rem;
          height: 6.2rem;

          &.mx-auto {
            margin-left: 0 !important;
          }
        }
      }

      .site-title {
        @extend %profile-ml;

        a {
          font-size: 1.7rem;
          letter-spacing: 1px;
        }
      }

      .site-subtitle {
        @extend %profile-ml;

        word-spacing: 0;
        margin-top: 0.3rem;
      }

    } // .profile-wrapper (min-width: 1650px)

    ul {
      padding-left: 2.5rem;

      > li:last-child {
        > a {
          position: static;
        }
      }

      .nav-item {
        text-align: left;

        .nav-link {
          > span {
            letter-spacing: 2px;
          }

          > i {
            &.unloaded {
              display: inline-block !important;
            }
          }
        }

      }
    }

    .sidebar-bottom {
      padding-left: 3.5rem;
      width: 100%;

      $icon-block-size: 2rem;

      &.justify-content-center {
        -webkit-box-pack: start !important;
        -ms-flex-pack: start !important;
        justify-content: flex-start !important;
      }

      > span,
      > a {
        @include ml-mr(0.15rem);

        height: $icon-block-size;
        margin-bottom: 0.5rem; // wrap line
      }

      i {
        background-color: var(--sidebar-btn-bg);
        font-size: 1rem;
        width: $icon-block-size;
        height: $icon-block-size;
        border-radius: 50%;
        position: relative;

        &::before {
          position: absolute;
          top: 50%;
          left: 50%;
          transform: translate(-50%, -50%);
        }
      }

      .icon-border {
        top: 0.9rem;
      }

    } // .sidebar-bottom

  } // #sidebar

  footer > div.d-flex {
    width: 92%;
    max-width: 1140px;
  }

  #search-result-wrapper {
    > div {
      max-width: #{$main-content-max-width};
    }
  }

} // min-width: 1650px

@media all and (min-width: 1700px) {
  #topbar-wrapper {
    /* 100% - 350px - (1920px - 350px); */
    padding-right: calc(100% - #{$sidebar-width-large} - (1920px - #{$sidebar-width-large}));
  }

  #topbar {
    max-width: calc(#{$main-content-max-width} + 20px);
  }

  #main > div.row {
    padding-left: calc((100% - #{$main-content-max-width} - 2%) / 2);
  }

  #panel-wrapper {
    margin-left: 3%;
  }

  footer {
    padding-left: 0;
    padding-right: calc(100% - #{$sidebar-width-large} - 1180px);
  }

  #back-to-top {
    right: calc(100% - 1920px + 15rem);
  }

}

@media (min-width: 1920px) {
  #main > div.row {
    padding-left: 190px;
  }

  #search-result-wrapper {
    padding-right: calc(100% - #{$sidebar-width-large} - 1180px);
  }

  #panel-wrapper {
    margin-left: 41px;
  }
}