web/assets/css/main.scss

---
---
/*!
* The main styles.
* v2.0
* https://github.com/cotes2020/jekyll-theme-chirpy
* © 2018-2019 Cotes Chung
* MIT Licensed
*/

@import "_fonts";
@import "_dark/dark-main";
@import "_module";

html, body {
  height: 100%;
  font-size: 16px;
}

/* Solved jumping scrollbar */
html {
  overflow-y: scroll;
}

body {
  line-height: 1.75rem;
  background: var(--main-wrapper-bg, #fafafa);
  color: var(--text-color, #212529);
  -webkit-font-smoothing: antialiased;
  font-family: 'Source Sans Pro', 'Microsoft Yahei', sans-serif;
}

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

#sidebar {
  @include pl-pr(0);
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  overflow-y: auto;
  width: 260px;
  z-index: 99;
  -webkit-transition: transform 0.4s ease;
  transition: transform 0.4s ease;
  background: rgb(42, 30, 107);
  background: var(--sidebar-bg,
  radial-gradient(circle, rgba(42, 30, 107, 1) 0%, rgba(35, 37, 46, 1) 100%));

  a {
    @include sidebar-icon;
  }

  .sidebar-bottom {
    .icon-border+a { // the icon behide mode-toggle
      margin-left: .1rem;
    }
  }
  .nav-link {
    border-radius: 0;
    font-size: .95rem;
    font-weight: 600;
    letter-spacing: 1px;
  }
  .nav-item {
    height: 20%;
    &:hover {
      .nav-link {
        color: #f8f9facf;
      }
    }
    &.active {
      .nav-link {
        color: #fcfcfc;
      }
    }
  }

  ul {
    height: 16.5rem;
    display: -webkit-box;
    display: -ms-flexbox;
  }

  .sidebar-bottom {
    font-size: 1.2rem;
    margin: 2rem 2.5rem 1.6rem;

    a {
      margin-bottom: .5rem; // icons may have multi lines
    }

    a:hover, #mode-toggle-wrapper>i:hover {
      color: #fff;
    }

    #mode-toggle-wrapper {
      i {
        @include sidebar-icon;
        margin-right: 0;
        font-size: 1.05rem;
        text-align: center;
        position: relative;
        bottom: 1px;
      }
    }

    .icon-border {
      background: #525354;
      width: 3px;
      height: 3px;
      border-radius: 50%;
      margin-top: .75rem;
    }
  }

} // #sidebar

#sidebar ul > li.active:nth-child(1) ~ li:last-child::after,
#sidebar ul > li.nav-item:nth-child(1):hover ~ li:last-child::after {
  // top: calc(-400% + (26px / 2));
  top: -195px;
  visibility: visible;
}

#sidebar ul > li.active:nth-child(2) ~ li:last-child::after,
#sidebar ul > li.nav-item:nth-child(2):hover ~ li:last-child::after {
  // top: calc(-300% + (26px / 2));
  top: -143px;
  visibility: visible;
}

#sidebar ul > li.active:nth-child(3) ~ li:last-child::after,
#sidebar ul > li.nav-item:nth-child(3):hover ~ li:last-child::after {
  // top: calc(-200% + (26px / 2));
  top:  -91px;
  visibility: visible;
}

#sidebar ul > li.active:nth-child(4) ~ li:last-child::after,
#sidebar ul > li.nav-item:nth-child(4):hover ~ li:last-child::after {
  // top: calc(-100% + (26px / 2));
  top: -39px;
  visibility: visible;
}

#sidebar ul > li.active:nth-child(5):last-child::after,
#sidebar ul > li.nav-item:nth-child(5):last-child:hover::after {
  // top: calc(26px / 2);
  top: 13px;
  visibility: visible;
}

#sidebar ul>li:last-child {
  >a {
    margin-right: -3px;
    max-width: calc(100% - 3px);
  }
  &::after {
    visibility: hidden;
    content: "";
    position: relative;
    right: 1px;
    width: 3px;
    height: 26px;
    background-color: var(--nav-cursor, #fcfcfc);
    pointer-events: none;
  }
}

@media (hover: hover) {
  #sidebar ul>li:last-child::after {
    -webkit-transition: top .5s ease;
    -moz-transition: top .5s ease;
    -o-transition: top .5s ease;
    transition: top .5s ease;
  }
}

#nav-wrapper {
  width: 100%;
  flex-grow: 1;
}

#profile-wrapper {
  margin-top: 2rem;
}

#avatar {
  >a {
    display: block;
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    border: 2px solid #b6b6b6;
    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>a {
    border-color: #fff;
  }

  img {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-repeat: no-repeat;
    -webkit-transition: all .5s !important;
    -moz-transition: all .5s !important;
    transition: all .5s !important;
    &:hover {
      -ms-transform: scale(1.2);
      -moz-transform: scale(1.2);
      -webkit-transform: scale(1.2);
      transform: scale(1.2);
    }
  }
} // #avatar

#site-title {
  text-align: center;
  a {
    color: #b6b6b6;
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: .5px;
    &:hover {
      color: #fff;
      text-decoration: none;
    }
  }
}

#site-subtitle {
  font-size: 95%;
  text-align: center;
  color: #828282;
  line-height: 1.2rem;
  word-spacing: 1px;
  margin: .5rem 1.5rem 2rem 1.5rem;
}

.sidebar-expand {
  box-shadow: 4px 0 8px 0 rgba(0, 0, 0, 0.2), 6px 0 20px 0 rgba(0, 0, 0, 0.19) !important;
}

#search-result-wrapper {
  display: none;
  position: fixed;
  top: 0;
  padding-top: 3rem;
  height: 100%;
  overflow: auto;
  .post-content {
    margin-top: 2rem;
  }
}


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

#topbar-wrapper {
  height: 3rem;
  position: fixed;
  top: 0;
  left: 260px; /* 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);
  box-shadow: 0 3px 5px 0 rgba(0, 0, 0, 0.05);
  background-color: var(--topbar-wrapper-bg, white);
}

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

#breadcrumb {
  font-size: 1rem;
  color: gray;
  padding-left: .5rem;
  a:hover {
    @extend %link-hover;
  }
  span {
    &:not(:last-child) {
      &::after {
        content: "›";
        padding: 0 .3rem;
      }
    }
  }
}

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

#search-wrapper {
  display: flex;
  width: 95%;
  border-radius: 1rem;
  border: 1px solid var(--search-wrapper-bg, #fff);
  background: var(--search-wrapper-bg, #f5f5f5);
  padding: 0 .5rem;
  transition: background-color .15s ease-in-out,border-color .15s ease-in-out;
  i {
    z-index: 2;
    font-size: .9rem;
    color: var(--search-icon, #c2c6cc);
  }
  .fa-times-circle { /* button 'clean up' */
    visibility: hidden;
  }
}

#search-cancel { /* 'Cancel' link */
  color: var(--link-color, #2a408e);
  margin-left: 1rem;
  display: none;
}

#search-input {
  background: center;
  border: 0;
  border-radius: 0;
  padding: .18rem .3rem;
  color: var(--text-color);
}

#search-input {
  &: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(--tag-bg, #f8f9fa);
    border: none;
    padding: .5rem;
    margin: 0 1rem 1rem 0;
    &::before {
      content: "#";
      padding-right: .2rem;
    }
  }
}

#search-results {
  padding-bottom: 6rem;
  a {
    @extend %link-color;
    @extend %no-bottom-border;
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 2.5rem;
    &:hover {
      @extend %link-hover;
    }
  }
  >div {
    &:not(:last-child) {
      margin-bottom: 1rem;
    }
    i { // icons
      color: #818182;
      margin-right: .15rem;
      font-size: 80%;
    }
    >p {
      overflow: hidden;
      text-overflow: ellipsis;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
    }
  }
}

#topbar-title {
  display: none;
  font-size: 1.1rem;
  font-weight: 600;
  font-family: sans-serif;
  color: var(--text-color, rgb(78, 78, 78));
  text-align: center;
  width: 70%;
  overflow: hidden;
  text-overflow: ellipsis;
  word-break: keep-all;
  white-space: nowrap;
}

#mask {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: var(--mask-bg, #c1c3c5);
  opacity: 0.5;
  z-index: 1;
  @at-root .sidebar-expand~& {
    display: block!important;
  }
}

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

$footer-height: 5rem;

#main-wrapper {
  background-color: var(--main-wrapper-bg, white);
  position: relative;
  min-height: 100%;
  padding-bottom: $footer-height;
  @include pl-pr(0);
  margin-left: 260px;
  transition: transform 0.4s ease;
  -webkit-transition: transform 0.4s ease;
}

#main>div.row:first-child>div {
  &:nth-child(1), &:nth-child(2) {
    margin-top: 3rem; /* same as the height of topbar */
  }
  &:first-child {
    /* 3rem for topbar, 6rem for footer */
    min-height: calc(100vh - 3rem - 6rem);
  }
}

#post-wrapper {
  /* 350px for post extended block  */
  min-height: calc(100vh - 3rem - 6rem - 470px) !important;
  .post-content {
    a:hover {
      @extend %link-hover;
    }
  }
}

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

footer {
  position: absolute;
  bottom: 0;
  padding: 0 1rem;
  height: $footer-height;
  font-size: 0.8rem;
  color: #7a7b7d;
  background-color: var(--main-wrapper-bg, #ffffff);
  >div.d-flex {
    line-height: 1.2rem;
    width: 95%;
    max-width: 1045px;
    border-top: 1px solid var(--footer-border, #f3f3f3);
    margin-bottom: 1rem;
    >div {
      width: 350px;
    }
  }
  a {
    &:link {
      @include no-text-decoration;
    }
    &:hover {
      @extend  %link-hover;
      @include no-text-decoration;
    }
  }
  .footer-left a {
    @extend %footer-content;
  }
  .footer-right {
    text-align: right;
    a {
      @extend %footer-content;
    }
  }
}

/*--- Panels ---*/

.access {
  top: 2rem;
  transition: top 0.2s ease-in-out;
  margin-right: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 6rem;
  color: #6c757d;
  &:only-child {
    position: -webkit-sticky; /* Safari */
    position: sticky;
  }
  &.topbar-down {
    top: 6rem;
  }
  >div {
    padding-left: 1rem;
    border-left: 1px solid rgba(158, 158, 158, 0.17);
    &:not(:first-child) {
      margin-top: 4rem;
    }
  }
  h3 {
    padding-top: .5rem;
    padding-bottom: .5rem;
    margin-top: 0;
    margin-bottom: 0;
    letter-spacing: -0.02em;
    font-size: 1rem;
    font-family: 'Oswald', sans-serif;
  }
  .post-content {
    font-size: .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(--main-border, #e9ecef);
    border-radius: .8rem;
    padding: .3rem .5rem;
    margin: 0 .35rem .5rem 0;
    &:hover {
      background-color: #2a408e;
      border-color: #2a408e;
      color: #fff;
      transition: none;
    }
  }
}

#access-lastmod {
  ul {
    >li {
      height: 1.8rem;
      overflow: hidden;
      text-overflow: ellipsis;
      display: -webkit-box;
      -webkit-line-clamp: 1;
      -webkit-box-orient: vertical;
      list-style: none;
    }
    a {
      color: #6c757d;
    }
  }

  a {
    @extend %no-bottom-border;
    &:hover {
      @extend %link-hover;
    }
  }
}

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

#back-to-top {
  display: none;
  z-index: 1;
  cursor: pointer;
  position: fixed;
  background: var(--button-bg, #fff);
  color: var(--text-color, #686868);
  height: 2.6em;
  width: 2.7em;
  border-radius: 50%;
  border: 1px solid var(--main-border, #f1f1f1);
  transition: 0.2s ease-out;
  -webkit-transition: 0.2s ease-out;
}

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

/*--- Typography ---*/

h1 {
  font-size: 1.8rem;
  font-weight: 400;
}

h2 {
  @extend %section;
  @extend %anchor;
  font-size: 1.35rem;
  font-weight: 400;
}

h3 {
  @extend %section;
  @extend %anchor;
  font-size: 1.25rem;
}

h4 {
  @extend %section;
  @extend %anchor;
  font-size: 1.15rem;
}

h5 {
  font-size: 1.1rem;
}

blockquote {
  border-left: 5px solid var(--blockquote-border, #eee);
  padding-left: 1rem;
  color: var(--blockquote-text, #9a9a9a);
  .post-content & {
    a {
      color: var(--link-color, #2a408e);
    }
  }
}

kbd {
  margin: 0 .3rem;
}

sup {
  @extend %anchor;
}

.footnotes ol {
  margin-top: .5rem;
  >li {
    padding-top: .2rem;
    margin-top: -0.2rem;
    >p {
      padding-left: .2em;
    }
    &:not(:last-child) {
      margin-bottom: -.8rem;
    }
    &:target>p {
      background-color: var(--footnote-target-bg, lightcyan);
      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#{&} {
    margin: 0 .2em;
    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;
  }
  @at-root sup:target>a#{&} {
    background-color: var(--footnote-target-bg, lightcyan);
    padding: 0 2px;
  }
}

.reversefootnote {
  @at-root a#{&} {
    font-size: .6rem;
    position: absolute;
    line-height: 1;
    padding-top: .5em;
    margin-left: .5em;
    border-bottom-style: none !important;
  }
}

a {
  @at-root p>#{&} {
    @extend %link-color;
  }
  @at-root span>#{&} {
    @extend %link-color;
  }
  .post-preview & {
    @extend %link-color;
    &:hover {
      @extend %link-hover;
    }
  }
  #page .categories & {
    @extend %link-color;
    @extend %no-bottom-border;
  }
  #tags & {
    @extend %link-color;
  }
  #page-category & {
    @extend %link-color;
    @extend %no-bottom-border;
  }
  #page-tag & {
    @extend %link-color;
    @extend %no-bottom-border;
  }
  #archives & {
    @extend %link-color;
    @extend %no-bottom-border;
  }
  .license-wrapper .license-text &:hover {
    @extend %link-hover;
  }
  #page .post-content &:hover {
    @extend %link-hover;
  }

} // a

.post {
  h1 {
    margin-top: 3rem;
  }
  em { /* MarkDown italic */
    padding-right: .2rem;
  }
  a:hover {
    code {
      @extend %link-hover;
    }
  }
}


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

div.post-content {
  >table, li>table {
    min-width: 60%;
    border-collapse: collapse;
    border-spacing: 0;
    margin-bottom: 1.5rem;
  }
}

table {
  thead {
    border-bottom: solid 2px rgba(210, 215, 217, 0.75);
    +tbody tr {
      &:nth-child(2n) {
        background-color: var(--tb-even-bg);
      }
      &:last-child:nth-child(2n) {
        border-bottom: solid 1px var(--tb-odd-bg, rgba(210, 215, 217, 0.75));
      }
      &:nth-child(2n + 1) {
        background-color: var(--tb-odd-bg, #f8f9fa);
      }
    }
    th {
      @extend %table-cell;
    }
  }

  tbody td {
    @extend %table-cell;
  }

} // table


/*--- post ---*/

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

.post-meta {
  font-size: 0.85rem;
  word-spacing: 1px;
  a {
    color: var(--link-color, #2a408e);
    border-bottom: 1px dotted var(--link-underline-color, #c2c6cc);
    &:not(:last-child) {
      margin-right: 2px;
    }
    &:hover {
      @extend %link-hover;
    }
  }
}

.post-content {
  line-height: 1.8;
  font-size: 1rem;
  margin-top: 2rem;
  overflow-wrap: break-word;
  word-wrap: break-word;
  a {
    @extend %link-color;
    border-bottom: 1px dotted var(--link-underline-color, #c2c6cc);
    &:hover {
      @extend %link-hover;
    }
  }
}

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

.post-tag {
  display: inline-block;
  min-width: 2rem;
  text-align: center;
  background: var(--tag-bg, rgba(0, 0, 0, 0.075));
  border-radius: .34rem;
  padding: 0 .4rem;
  color: #818182;
  line-height: 1.6rem;
  &:not(:first-child) {
    margin-left: .2rem;
  }
  &:hover {
    @extend %tag-hover;
    border-bottom: none;
    text-decoration: none;
    color: #d2603a;
  }
}

/* --- buttons --- */
.btn-lang {
  border: 1px solid !important;
  padding: 0 3px 1px 3px;
  border-radius: 3px;
}

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

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

.unloaded {
  display: none !important;
}

.visable {
  visibility: visible !important;
}

.hidden {
  visibility: hidden !important;
}

.no-scroll {
  position: fixed;
  width: 100%;
}

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

.btn-box-shadow {
  box-shadow: 0 0 8px 0 var(--main-wrapper-bg, #eaeaea) !important;
}

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

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

.tooltip-inner { /* Overrided BS4 Tooltip */
  font-size: .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, #e9ecef) !important;
  background: center !important;
}

/*--- Responsive Design ---*/

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

  #main>div.row:first-child>div:first-child {
    min-height: calc(100vh - 3rem - 10rem); /* topbar is 3rem and footer is 10rem */
  }

  #post-wrapper {
    min-height: calc(100vh - 3rem - 10rem - 470px) !important;
    h1 {
      margin-top: 2.2rem;
      font-size: 1.55rem;
    }
  }

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

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

  .post-content {
    font-size: 1.08rem;
  }

  /* table text in small screens */
  div>table, p~table {
    width: 100%;
    table-layout: fixed;
    word-wrap: break-word;
  }

  $footer-height: 6rem;

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

  footer {
    height: $footer-height;
    >div.d-flex {
      width: 100%;
      padding: 1.5rem 0;
      margin-bottom: .3rem;
      flex-wrap: wrap;
      justify-content: left!important;
      -ms-flex-pack: distribute!important;
      justify-content: space-around!important;
    }
    .footer-left, .footer-right {
      text-align: center;
    }
  }

}

/* Sidebar is visibal */
@media all and (min-width: 831px) {

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

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

  /* 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%;
  }

}

/* iPad 9.7" horizontal */
@media all and (min-width: 992px) and (max-width: 1024px) {
  #main-wrapper .col-lg-11 {
    -webkit-box-flex: 0;
    -ms-flex: 0 0 96%;
    flex: 0 0 96%;
    max-width: 96%;
  }
}


/* Hide SideBar and TOC */
@media all and (max-width: 830px) {

  .sidebar-expand {
    transform: translateX(0) !important;
    ~#main-wrapper {
      transform: translateX(260px) !important;
    }
  }

  #sidebar {
    transform: translateX(-260px); // hide
    -webkit-transform: translateX(-260px);
    .cursor {
      -webkit-transition: none;
      -moz-transition: none;
      transition: none;
    }
  }

  #main-wrapper {
    margin-left: 0;
  }

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

  #page h1.dynamic-title {
    display: none;
    ~.post-content {
      margin-top: 3rem;
    }
  }

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

  #topbar-wrapper {
    position: -webkit-sticky;
    position: sticky;
    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;
  }

  sup {
    padding-top: 3.4rem;
  }

  .footnotes ol>li {
    padding-top: 3.5rem;
    margin-top: -4.3rem;
    &:first-child {
      margin-top: -3.5rem;
    }
  }
}


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


/* Compact icons in sidebar & TOC hidden */
@media all and (min-width: 832px) and (max-width: 1199px) {

  #sidebar {
    width: 210px;
    .sidebar-bottom {
      @include ml-mr(1.5rem);
      .icon-border {
        @include ml-mr(.25rem);
      }
    }
  }

  #topbar-wrapper {
    left: 210px;
  }

  #search-result-wrapper {
    width: calc(100% - 210px);
  }

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

  #site-subtitle {
    font-size: 90%;
    @include ml-mr(1rem);
  }

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

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

}

/* Pannel 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;
  }

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


/*--- 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: 300px;
  }

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

  #search-input {
    -webkit-transition: all .3s ease-in-out;
    transition: all .3s ease-in-out;
  }

  #search-result-wrapper {
    width: calc(100% - 260px);
  }

  #search-results>div {
    max-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%;
    }
  }

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

}

@media all and (min-width: 1400px) {

  #main>div.row {
    padding-left: calc((100% - 1150px) / 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: .55rem !important;
      padding-right: 1.9rem !important;
    }
  }

  $side-bar-width: 350px;

  #main-wrapper {
    margin-left: $side-bar-width
  }

  #panel-wrapper {
    margin-left: calc((100% - 1150px) / 10);
  }

  #topbar-wrapper {
    left: $side-bar-width
  }

  #topbar {
    max-width: 1150px;
  }

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

  #profile-wrapper {
    margin-top: 4rem;
    margin-bottom: 3rem;
    padding-left: 18%;
    -ms-flex-direction: column!important;
  }

  #avatar {
    -webkit-box-pack: normal !important;
    -ms-flex-pack: normal !important;
    justify-content: normal !important;
    >a {
      width: 6.2rem;
      height: 6.2rem;
    }
  }

  .profile-text {
    padding-left: .5rem;
    /* .d-flex */
    display: -webkit-box!important;
    display: -ms-flexbox!important;
    display: flex!important;
    /* .flex-wrap */
    -ms-flex-wrap: wrap!important;
    flex-wrap: wrap!important;
    /* .align-content-center */
    -ms-flex-line-pack: center!important;
    align-content: center!important;
  }

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

  .profile-text>div {
    text-align: left !important;
    width: 100%;
  }

  #site-subtitle {
    word-spacing: 0;
    padding-right: 3rem;
    margin: .3rem 0 0 0;
  }

  #sidebar {
    width: $side-bar-width;
    ul {
      margin-left: 5%;
      >li>a {
        padding-left: 2.5rem;
        -webkit-box-pack: start!important;
        -ms-flex-pack: start!important;
        justify-content: flex-start!important;
      }
    }

    .nav-link {
      >span {
        letter-spacing: 3px;
      }
      >i {
        @include icon-round(1.65rem);
        line-height: 1rem;
        font-size: .6rem;
        padding: .5em 0 0 .1em;
        display: inline-block!important;
      }
    }

    .sidebar-bottom {
      margin-left: 3.5rem;
      margin-right: 3rem;
      font-size: 1.3rem;
      a {
        border: 1px solid;
        border-radius: 50%;
        font-size: 1rem;
        width: 2rem;
        height: 2rem;
        text-align: center;
        i {
          text-align: center;
          width: 1.25em;
          padding-top: .44rem;
        }
      }

      #mode-toggle-wrapper {
        font-size: .9rem;
        i {
          @include icon-round(2rem);
          padding-top: .44rem;
          bottom: 0;
        }
      }

      .icon-border {
        @include ml-mr(.2rem);
        margin-top: .85rem;
        +a {
          margin-left: 0;
        }
      }

    } // .sidebar-bottom
  } // #sidebar

  footer>div.d-flex {
    width: 87%;
    max-width: 1140px;
  }

  #search-result-wrapper {
    width: calc(100% - 350px); // 350px is the with of sidebar
    >div {
      max-width: 1150px;
    }
  }

} // min-width: 1650px

@media all and (min-width: 1700px) {
  #topbar-wrapper {
    padding-right: calc(100% - 350px - 1570px) /* 100% - 350px - (1920px - 350px); */
  }

  #main>div.row {
    padding-left: calc((100% - 1150px - 2%) / 2);
  }

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

  footer {
    padding-left: 0;
    padding-right: calc(100% - 350px - 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% - 350px - 1530px);
  }

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