/*
  The common styles
*/

html {
  @media (prefers-color-scheme: light) {
    &:not([data-mode]),
    &[data-mode='light'] {
      @include light-scheme;
    }

    &[data-mode='dark'] {
      @include dark-scheme;
    }
  }

  @media (prefers-color-scheme: dark) {
    &:not([data-mode]),
    &[data-mode='dark'] {
      @include dark-scheme;
    }

    &[data-mode='light'] {
      @include light-scheme;
    }
  }

  font-size: 16px;
}

body {
  background: var(--main-bg);
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
    env(safe-area-inset-bottom) env(safe-area-inset-left);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  font-family: $font-family-base;
  line-height: 1.75;
}

/* --- Typography --- */

h1 {
  @extend %heading;

  font-size: 1.9rem;
}

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

  font-size: 1.5rem;
}

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

  font-size: 1.2rem;
}

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

  font-size: 1.15rem;
}

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

  font-size: 1.1rem;
}

a {
  @extend %link-color;
}

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

  &[data-src] {
    &.lazyloaded {
      -webkit-animation: fade-in 0.4s ease-in;
      animation: fade-in 0.4s ease-in;
    }

    &[data-lqip='true'] {
      &.lazyload,
      &.lazyloading {
        -webkit-filter: blur(20px);
        filter: blur(20px);
      }
    }

    &:not([data-lqip='true']) {
      &.lazyload,
      &.lazyloading {
        background: var(--img-bg);
      }
    }

    &.shadow {
      -webkit-filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
      filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
      box-shadow: none !important; /* cover the Bootstrap 4.6.1 styles */
    }

    @extend %img-caption;
  }

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

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

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

  &[class^='prompt-'] {
    border-left: 0;
    position: relative;
    padding: 1rem 1rem 1rem 3rem;
    color: var(--prompt-text-color);

    @extend %rounded;

    &::before {
      text-align: center;
      width: 3rem;
      position: absolute;
      left: 0.25rem;
      margin-top: 0.4rem;
      text-rendering: auto;
      -webkit-font-smoothing: antialiased;
    }

    > p:last-child {
      margin-bottom: 0;
    }
  }

  @include prompt('tip', '\f0eb', 'regular');
  @include prompt('info', '\f06a');
  @include prompt('warning', '\f06a');
  @include prompt('danger', '\f071');
}

kbd {
  font-family: inherit;
  display: inline-block;
  vertical-align: middle;
  line-height: 1.3rem;
  min-width: 1.75rem;
  text-align: center;
  margin: 0 0.3rem;
  padding-top: 0.1rem;
  color: var(--kbd-text-color);
  background-color: var(--kbd-bg-color);
  border-radius: 0.25rem;
  border: solid 1px var(--kbd-wrap-color);
  box-shadow: inset 0 -2px 0 var(--kbd-wrap-color);
}

footer {
  font-size: 0.8rem;
  background-color: var(--main-bg);

  div.d-flex {
    height: $footer-height;
    line-height: 1.2rem;
    padding-bottom: 1rem;
    border-top: 1px solid var(--main-border-color);

    > div {
      width: 350px;
    }
  }

  a {
    @extend %text-color;

    &:link {
      @extend %no-decoration;
    }

    &:hover {
      @extend %link-hover;
      @extend %no-decoration;
    }
  }

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

/* fontawesome icons */
i {
  &.far,
  &.fas {
    @extend %no-cursor;
  }
}

/* --- Panels --- */

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

  &:only-child {
    position: -webkit-sticky;
    position: sticky;
  }

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

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

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

#panel-wrapper {
  /* the headings */
  .panel-heading {
    @include label(inherit);
  }

  .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: #ffffff;
      transition: none;
    }
  }

  [data-topbar-visible='true'] & > div {
    top: 5.5rem;
  }
}

#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: -moz-fit-content;
      width: -webkit-fit-content;
      width: fit-content;
      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;
    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;
  }
}

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

/* it will be created by Liquid */
.table-wrapper {
  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 --- */

.post {
  h1 {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
  }

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

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

.post-meta {
  font-size: 0.85rem;

  a {
    &:not([class]):hover {
      @extend %link-hover;
    }
  }

  em {
    @extend %normal-font-style;
  }
}

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

  a {
    &.popup {
      @extend %no-cursor;
      @extend %img-caption;
      @include mt-mb(0.5rem);

      cursor: zoom-in;
    }

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

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

  ol,
  ul {
    &:not([class]),
    &.task-list {
      -webkit-padding-start: 1.75rem;
      padding-inline-start: 1.75rem;

      li {
        margin: 0.25rem 0;
        padding-left: 0.25rem;
      }

      ol,
      ul {
        -webkit-padding-start: 1.25rem;
        padding-inline-start: 1.25rem;
        margin: 0.5rem 0;
      }
    }
  }

  ul.task-list {
    -webkit-padding-start: 1.25rem;
    padding-inline-start: 1.25rem;

    li {
      list-style-type: none;
      padding-left: 0;

      /* checkbox icon */
      > i {
        width: 2rem;
        margin-left: -1.25rem;
        color: var(--checkbox-color);

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

      ul {
        -webkit-padding-start: 1.75rem;
        padding-inline-start: 1.75rem;
      }
    }

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

  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;
  }
}

.rounded-10 {
  border-radius: 10px !important;
}

.img-link {
  color: transparent;
  display: inline-flex;
}

.shimmer {
  overflow: hidden;
  position: relative;
  background: var(--img-bg);

  &::before {
    content: '';
    position: absolute;
    background: var(--shimmer-bg);
    height: 100%;
    width: 100%;
    -webkit-animation: shimmer 1s infinite;
    animation: shimmer 1s infinite;
  }

  @-webkit-keyframes shimmer {
    0% {
      -webkit-transform: translateX(-100%);
      transform: translateX(-100%);
    }
    100% {
      -webkit-transform: translateX(100%);
      transform: translateX(100%);
    }
  }

  @keyframes shimmer {
    0% {
      -webkit-transform: translateX(-100%);
      transform: translateX(-100%);
    }
    100% {
      -webkit-transform: translateX(100%);
      transform: translateX(100%);
    }
  }
}

.embed-video {
  width: 100%;
  height: 100%;
  margin-bottom: 1rem;

  @extend %rounded;

  &.youtube {
    aspect-ratio: 16 / 9;
  }

  &.twitch {
    aspect-ratio: 310 / 189;
  }
}

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

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

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

.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 {
  flex-grow: 1 !important;
}

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

.no-text-decoration {
  @extend %no-decoration;
}

.card.post-preview {
  border-radius: $card-radius;
  border: 0;
  background: var(--card-bg);
  box-shadow: rgba(0, 0, 0, 0.05) 0 6px 14px 0,
    var(--card-border-color) 0 0 0 1px;

  &:hover {
    background-color: var(--card-hovor-bg);

    img {
      filter: brightness(0.7) !important;
    }
  }
}

/* overwrite bootstrap muted */
.text-muted {
  color: var(--text-muted-color) !important;
}

/* Overwrite bootstrap tooltip */
.tooltip-inner {
  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;
}

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

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

/* --- Overriding --- */

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

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

/* MathJax */
mjx-container {
  overflow-y: hidden;
  min-width: auto !important;
}

/* --- 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 {
      @extend %no-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;
      -webkit-transform: translateZ(0);
      transform: translateZ(0); /* fixed the zoom in Safari */
      transition: border-color 0.35s ease-in-out;

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

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

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

  .site-title {
    margin-top: 0.55rem;

    a {
      @extend %clickable-transition;

      font-weight: 900;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: rgba(134, 133, 133, 0.99);
    }
  }

  .site-subtitle {
    font-size: 95%;
    color: var(--sidebar-muted-color);
    line-height: 1.25rem;
    word-spacing: 1px;
    margin: 0.2rem 1.5rem 0.5rem 1.5rem;
    min-height: 3rem; /* avoid vertical shifting in multi-line words */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    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: calc($cursor-width / 2);
          width: 100%;
        }

        /* the cursor */
        &::after {
          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) * 0.5);

      @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 {
    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 {
      font-size: 1.2rem;
      line-height: 1.75rem;
    }

    .mode-toggle {
      padding: 0;
      border: 0;
      margin-bottom: 1px;
      background-color: transparent;

      @extend %icon;
      @extend %sidebar-links;

      > i {
        @extend %clickable-transition;
      }

      &:hover > i {
        color: var(--sidebar-active-color);
      }
    }

    .icon-border {
      @extend %no-cursor;

      background-color: var(--sidebar-muted-color);
      content: '';
      width: 3px;
      height: 3px;
      border-radius: 50%;
    }
  } /* .sidebar-bottom */
} /* #sidebar */

@media (hover: hover) {
  .card.post-preview {
    transition: all 0.35s ease-in-out;

    img {
      transition: all 0.35s ease-in-out;
    }
  }

  #sidebar ul > li:last-child::after {
    transition: top 0.5s ease;
  }
}

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

#search-result-wrapper {
  display: none;
  height: 100%;
  width: 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);

  [data-topbar-visible='false'] & {
    top: -$topbar-height; /* same as topbar height. */
  }
}

#topbar {
  /* icons */
  i {
    color: #999999;
  }

  #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: 100%;
  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);
  }
}

/* 'Cancel' link */
#search-cancel {
  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);
  height: auto;

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

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

#search-hints {
  padding: 0 1rem;

  h4 {
    margin-bottom: 1.5rem;
  }

  .post-tag {
    display: inline-block;
    line-height: 1rem;
    font-size: 1rem;
    background: var(--search-tag-bg);
    border: none;
    padding: 0.5rem;
    margin: 0 1.25rem 1rem 0;

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

    @extend %link-color;
  }
}

#search-results {
  padding-bottom: 3rem;

  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;
    }

    /* icons */
    i {
      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;
}

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

  @at-root .row:only-child > #{&} {
    padding-bottom: 3rem;
  }
}

#mask {
  display: none;
  position: fixed;
  inset: 0 0 0 0;
  height: 100%;
  width: 100%;
  z-index: 1;

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

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

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

  @include pl-pr(0);
}

#core-wrapper,
#panel-wrapper {
  margin-top: $topbar-height; /* same as the height of topbar */
}

#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: -webkit-transform 0.2s ease-out;
  transition: transform 0.2s ease-out;
  transition: transform 0.2s ease-out, -webkit-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);
}

#notification {
  @-webkit-keyframes popup {
    from {
      opacity: 0;
      bottom: 0;
    }
  }

  @keyframes popup {
    from {
      opacity: 0;
      bottom: 0;
    }
  }

  .toast-header {
    background: none;
    border-bottom: none;
    color: inherit;
  }

  .toast-body {
    font-family: Lato, sans-serif;
    line-height: 1.25rem;

    button {
      font-size: 90%;
      min-width: 4rem;
    }
  }

  &.toast {
    display: none;

    &.show {
      display: block;
      min-width: 20rem;
      border-radius: 0.5rem;
      -webkit-backdrop-filter: blur(10px);
      backdrop-filter: blur(10px);
      background-color: rgba(255, 255, 255, 0.5);
      color: #1b1b1eba;
      position: fixed;
      left: 50%;
      bottom: 20%;
      -webkit-transform: translateX(-50%);
      transform: translateX(-50%);
      -webkit-animation: popup 0.8s;
      animation: popup 0.8s;
    }
  }
}

/*
  Responsive Design:

 {sidebar, content, panel} >= 1200px screen width
 {sidebar, content} >= 850px screen width
 {content} <= 849px screen width

*/

@media all and (max-width: 576px) {
  footer {
    height: $footer-height-mobile;

    div.d-flex {
      padding: 1.5rem 0;
      line-height: 1.65;
      flex-wrap: wrap;
      justify-content: space-around !important;
    }

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

  #main-wrapper {
    min-height: calc(100vh - #{$footer-height-mobile});
  }

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

    .post-content {
      > blockquote[class^='prompt-'] {
        @include ml-mr(-1.25rem);

        border-radius: 0;
        max-width: none;
      }
    }
  }

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

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

@media all and (max-width: 768px) {
  %full-width {
    max-width: 100%;
  }

  #topbar {
    @extend %full-width;
  }

  #main {
    @extend %full-width;
    @include pl-pr(0);
  }
}

/* hide sidebar and panel */
@media all and (max-width: 849px) {
  @mixin slide($append: null) {
    $basic: transform 0.4s ease;

    @if $append {
      transition: $basic, $append;
    } @else {
      transition: $basic;
    }
  }

  html,
  body {
    overflow-x: hidden;
  }

  footer {
    @include slide;
  }

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

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

  #sidebar {
    @include slide;

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

    .cursor {
      transition: none;
    }
  }

  #main-wrapper {
    @include slide;

    padding-top: $topbar-height;
  }

  #topbar,
  #main,
  footer > .container {
    max-width: 100%;
  }

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

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

  #topbar-wrapper {
    @include slide(top 0.2s ease);

    left: 0;
  }

  #core-wrapper,
  #panel-wrapper {
    margin-top: 0;
  }

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

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

  #tags {
    justify-content: center !important;
  }

  h1.dynamic-title {
    display: none;

    ~ .post-content {
      margin-top: 3rem;
    }
  }
} /* max-width: 849px */

@media all and (max-width: 849px) and (orientation: portrait) {
  [data-topbar-visible='false'] #topbar-wrapper {
    top: 0;
  }
}

/* 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,
  footer {
    margin-left: $sidebar-width;
  }

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

  #search-hints {
    display: none;
  }

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

  #search-result-wrapper {
    margin-top: 3rem;
    max-width: $main-content-max-width;
  }

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

  /* button 'back-to-Top' position */
  #back-to-top {
    bottom: 5.5rem;
    right: 5%;
  }

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

/* Pad horizontal */
@media all and (min-width: 992px) and (max-width: 1199px) {
  #main .col-lg-11 {
    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: $sidebar-width-small;
  }

  #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,
  footer {
    margin-left: $sidebar-width-small;
  }

  #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;
  }

  #main > div.row {
    justify-content: center !important;
  }
}

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

@media all and (min-width: 1200px) {
  #back-to-top {
    bottom: 6.5rem;
  }

  #search-wrapper {
    margin-right: 4rem;
  }

  #search-input {
    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) {
  #back-to-top {
    right: calc((100vw - #{$sidebar-width} - 1140px) / 2 + 3rem);
  }
}

@media all and (min-width: 1650px) {
  #main-wrapper,
  footer {
    margin-left: $sidebar-width-large;
  }

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

  #search-wrapper {
    margin-right: calc(
      #{$main-content-max-width} * 0.25 - #{$search-max-width}
    );
  }

  #topbar,
  #main,
  footer > .container {
    max-width: $main-content-max-width;
  }

  #core-wrapper,
  #tail-wrapper {
    padding-right: 4.5rem !important;
  }

  #back-to-top {
    right: calc(
      (100vw - #{$sidebar-width-large} - #{$main-content-max-width}) / 2 + 2rem
    );
  }

  #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;

        margin-top: 0.4rem;

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

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

        word-spacing: 0;
        margin-top: 0;
      }
    } /* .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 {
        justify-content: flex-start !important;
      }

      > span,
      > button.mode-toggle,
      > 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%;
          -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
        }
      }

      .icon-border {
        top: 0.9rem;
      }
    } /* .sidebar-bottom */
  } /* #sidebar */
} /* min-width: 1650px */