/* base
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: var(--main-font);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: var(--font-size);
  line-height: var(--line-height);
  overflow-y: scroll;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button:focus-visible,
a:focus-visible {
  outline: var(--primary-color) solid 3px;
}

::selection {
  background-color: var(--primary-color);
  color: var(--bg-color);
}

::-webkit-scrollbar {
  width: 8px;
  height: 6px;
  background-color: transparent;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-decoration-color);
  background-clip: padding-box;
  border-radius: 4px;
  border: 2px solid transparent;
}
@supports not selector(::-webkit-scrollbar) {
  * {
    scrollbar-width: thin;
    scrollbar-color: var(--text-decoration-color) transparent;
  }
  body {
    overflow-y: auto;
  }
}

/* prose
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

.prose {
  h1 {
    font-size: 1.15em;
    font-weight: bolder;
    margin: 1.5em 0 0.75em;
  }

  h2 {
    font-size: 1.1em;
    margin: 3em 0 1.5em;
  }

  h3, h4, h5, h6 {
    font-size: 1em;
    margin: 2.5em 0 1.5em;
  }

  .zola-anchor {
    visibility: hidden;
    margin-left: 0.75em;
    border: none;

    &::after {
      content: '#';
    }
  }

  h1, h2, h3, h4, h5, h6 {
    width: fit-content;
    &:hover a.zola-anchor {
      visibility: visible !important;
    }
  }

  p {
    font-size: 1em;
    line-height: inherit;
    word-wrap: break-word;
    margin: 1.5em 0;
  }

  a {
    border-bottom: 1.5px solid var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
    overflow-wrap: anywhere;

    @media (hover: hover) {
      &:hover {
        opacity: 0.9;
      }
    }
  }

  img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: var(--img-border-radius);
  }

  figure {
    margin: 0 auto;
  }

  figcaption {
    width: 100%;
    text-align: center;
    margin: 1em auto 2em;
    color: var(--text-pale-color);
    font-size: 0.9em;
  }

  blockquote {
    border-left: 1.5px var(--text-decoration-color) solid;
    padding-left: 16px;
    margin: 1em 0;
    color: var(--text-pale-color);

    p {
      margin: 1em 0;
    }

    &[class*="markdown-alert-"] {
      margin: 1.5em 0;
      display: grid;
      grid-template-columns: 18px 1fr;
      column-gap: 0.5em;

      &::before {
        // the icon, colored via mask so it follows currentColor
        content: "";
        grid-row: 1;
        grid-column: 1;
        align-self: center;
        width: 18px;
        height: 18px;
        background-color: currentColor;
        mask-repeat: no-repeat;
        mask-position: center;
        mask-size: contain;
        -webkit-mask-repeat: no-repeat;
        -webkit-mask-position: center;
        -webkit-mask-size: contain;
      }

      &::after {
        // the title
        grid-row: 1;
        grid-column: 2;
        align-self: center;
        font-weight: 600;
      }

      > * {
        grid-column: 1 / -1;
      }

      > p:first-of-type {
        margin-top: 0.5em;
      }
      > p:last-of-type {
        margin-bottom: 0;
      }
    }

    &.markdown-alert-note {
      color: var(--callout-note-color);
      border-color: var(--callout-note-color);
      &::before {
        mask-image: url("icon/note.svg");
        -webkit-mask-image: url("icon/note.svg");
      }
      &::after {
        content: var(--callout-note-title, "Note");
      }
    }

    &.markdown-alert-tip {
      color: var(--callout-tip-color);
      border-color: var(--callout-tip-color);
      &::before {
        mask-image: url("icon/tip.svg");
        -webkit-mask-image: url("icon/tip.svg");
      }
      &::after {
        content: var(--callout-tip-title, "Tip");
      }
    }

    &.markdown-alert-important {
      color: var(--callout-important-color);
      border-color: var(--callout-important-color);
      &::before {
        mask-image: url("icon/important.svg");
        -webkit-mask-image: url("icon/important.svg");
      }
      &::after {
        content: var(--callout-important-title, "Important");
      }
    }

    &.markdown-alert-warning {
      color: var(--callout-warning-color);
      border-color: var(--callout-warning-color);
      &::before {
        mask-image: url("icon/warning.svg");
        -webkit-mask-image: url("icon/warning.svg");
      }
      &::after {
        content: var(--callout-warning-title, "Warning");
      }
    }

    &.markdown-alert-caution {
      color: var(--callout-caution-color);
      border-color: var(--callout-caution-color);
      &::before {
        mask-image: url("icon/caution.svg");
        -webkit-mask-image: url("icon/caution.svg");
      }
      &::after {
        content: var(--callout-caution-title, "Caution");
      }
    }
  }

  ol, ul {
    padding-left: 1.4em;
  }

  li {
    margin: 0.5em 0;
    p {
      margin: 0.5em 0;
    }
  }

  li::marker {
    color: var(--primary-color);
  }

  hr {
    border: none;
    background-color: var(--text-decoration-color);
    opacity: 0.25;
    height: 2px;
    margin: 3em 0;
  }

  table {
    width: 100%;
    border-spacing: 0;
    border-collapse: collapse;
    margin: 1.5em 0;
    border: 1.5px solid var(--primary-color);
  }

  th,
  td {
    line-height: 2;
    text-align: center;
    border: 1px solid var(--primary-color);
    padding: 1px 10px;
  }

  :not(pre) > code {
    font-family: var(--code-font);
    font-size: 0.85em;
    padding: 1px 6px;
    color: var(--primary-color);
    background-color: var(--inline-code-bg-color);
    border-radius: var(--inline-code-border-radius);
    word-wrap: break-word;
  }

  pre {
    font-size: 0.85em;
    margin: 1.25em 0;
    padding: 12px 48px 12px 16px;
    line-height: 1.5;
    border: 1.5px solid var(--primary-color);
    border-color: var(--block-code-border-color);
    border-radius: var(--block-code-border-radius);
    overflow: auto;

    code {
      font-family: var(--code-font);
    }

    .giallo-ln {
      padding-right: 12px;
      user-select: none;
    }

    &.z-l-code,
    &.z-d-code {
      background-color: var(--bg-color);
    }

    &.mermaid {
      padding-right: 16px;
      border: none;
      svg {
        display: block;
        margin: 0 auto;
      }
    }
  }

  .codeblock {
    margin: 1.5em 0;
    position: relative;
    overflow: auto;

    pre {
      margin: 0;
    }
    code[data-name]::before {
      content: attr(data-name);
      display: block;
      position: absolute;
      left: 0px;
      top: 0px;
      padding: 12px 16px;
      color: var(--text-pale-color);
      width: 100%;
      border-bottom: 1px solid var(--primary-pale-color);
    }
    pre:has(code[data-name]) {
      padding-top: calc(36px + 1em * var(--line-height));
    }

    .copy {
      display: none;
      z-index: 9;
      position: absolute;
      right: 0.6em;
      top: 0.75em;
      width: 24px;
      height: 24px;
      padding: 2px;
      cursor: pointer;
      background: transparent;
      border: none;
      color: var(--text-pale-color);

      &.copied, &:hover {
        display: block;
        color: var(--primary-color);
      }
    }

    @media (hover: hover) {
      &:hover .copy {
        display: block;
      }
    }
  }

  .footnote-definition {
    position: relative;
    padding-left: 1.5em;
    font-size: 0.9em;
    margin: 3em 0 1em;
    + .footnote-definition {
      margin: 1em 0;
    }

    .footnote-definition-label {
      position: absolute;
      top: 0;
      left: 0;
      font-size: 1em;
      line-height: inherit;
      vertical-align: auto;
      &::after {
        content: ".";
      }
    }

    p {
      margin: 1em 0;
    }

    button.backlink {
      border: none;
      background: none;
      color: var(--primary-color);
      line-height: inherit;
      &:hover {
        cursor: pointer;
        text-decoration: underline;
      }
    }
  }

  .quote {
    border: none;
    position: relative;
    margin: 2em 0;
    padding: 1.5em 0 0 1.25em;
    color: var(--text-pale-color);

    .icon {
      color: var(--text-decoration-color);
      display: block !important;
      position: absolute;
      left: 0;
      top: 0;
    }

    .content > p:first-of-type {
      margin-top: 0;
    }
    .content > p:last-of-type {
      margin-bottom: 0;
    }

    .from {
      display: flex;
      justify-content: end;
      align-items: center;
      gap: 0.5em;
      p {
        margin: 0;
      }
    }
  }

  details {
    border: 1.5px solid var(--detail-border-color);
    border-radius: var(--detail-border-radius);
    margin: 1em 0;
    padding: 0.5em 1em;
    -webkit-tap-highlight-color: transparent;

    summary span {
      margin-left: 0.25em;
    }
  }

  .mermaid {
    background: #fff;
  }

  .youtube {
    position: relative;
    height: 0;
    padding-bottom: 56.25%;

    iframe {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border: 0;
    }
  }


  input {
    color-scheme: light;
  }
}

body.dark .prose {
  img {
    filter: brightness(var(--dark-mode-img-brightness));
  }
  .mermaid {
    filter: brightness(var(--dark-mode-chart-brightness));
  }
  input {
    color-scheme: dark;
  }
}

/* prose pages
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.prose-page {
  main {
    min-height: 100vh;
    min-height: 100dvh;
    margin: 0 auto;
    max-width: var(--main-max-width);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  article {
    padding: 0 15px;
  }

  .giscus {
    padding: 0 15px;
  }
}

/* collections
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

.prose {
  .collection {
    margin: 1.5em 0;

    &.flow-inline {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
    }

    &.flow-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
      gap: 1.5em;
    }

    a {
      -webkit-tap-highlight-color: transparent;
    }

    .image img {
      margin: 0;
    }

    span.title {
      color: var(--text-color);
    }

    a.title {
      border-bottom: none;
      > span {
        border-bottom: 1.5px solid var(--primary-color);
      }
    }

    .subtitle,
    .badge {
      font-size: 0.9em;
      color: var(--text-pale-color);
    }
  }

  /* card: rich block item */
  .layout-card {
    .item {
      margin: 3em 0;
      position: relative;
      display: flex;
      align-items: center;
      gap: 1.5em;

      > .image {
        flex-shrink: 0;
        width: 160px;
        img {
          width: 100%;
          height: auto;
          border-radius: var(--img-border-radius);
        }
      }

      @media (max-width: 425px) {
        flex-direction: column;
        align-items: stretch;
        gap: 1em;

        > .image {
          width: 100%;
        }
      }

      .body {
        flex: 1;
        min-width: 0;
      }

      &.featured::before {
        content: '*';
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        transform: translateX(-200%);
        line-height: 2;
        color: var(--primary-color);
      }
      @media (max-width: 768px) {
        &.featured::before {
          transform: translateX(-150%);
        }
      }

      .meta {
        display: flex;
        gap: 0.5em;

        .icon {
          height: calc(1em * var(--line-height));
          display: flex;
          align-items: center;
          flex-shrink: 0;
          img {
            height: 16px;
            width: 16px;
          }
        }
        .badge {
          margin-left: auto;
          flex-shrink: 0;
        }
      }

      .subtitle {
        display: block;
        margin: 0.75em 0;
      }

      .content {
        font-size: 1em;
        p {
          margin: 0.75em 0;
        }
      }

      .tags {
        font-size: 0.9em;
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 0.75em 1em;
        color: var(--text-pale-color);

        .tag span {
          font-size: 0.9em;
          margin-right: 4px;
        }
      }
    }

    &.flow-grid .item,
    &.flow-inline .item {
      margin: 0;
    }
    &.flow-grid {
      grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
    }
  }

  /* row: compact one-line item */
  .layout-row {
    &.flow-inline {
      gap: 0.5em 1.5em;
    }

    .item {
      display: inline-flex;
      width: fit-content;
      max-width: 100%;
      gap: 0.5em;
      padding: 4px 0;
      color: var(--text-color);
      position: relative;

      &.featured::before {
        content: '*';
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        transform: translateX(-200%);
        line-height: 2;
        color: var(--primary-color);
      }
      @media (max-width: 768px) {
        &.featured::before {
          transform: translateX(-150%);
        }
      }

      .icon {
        flex-shrink: 0;
        display: flex;
        align-items: center;
        height: calc(1em * var(--line-height));
        img {
          width: 16px;
          height: 16px;
        }
      }

      .main {
        display: inline-flex;
        gap: 0.5em;
        min-width: 0;
      }

      .main:has(+ .subtitle) {
        margin-right: 0.5em;
      }
    }

    &.flow-stack .item {
      display: flex;
      width: auto;
      margin: 0.25em 0;

      .badge {
        margin-left: auto;
        padding-left: 1em;
        flex-shrink: 0;
      }
    }

    @media (max-width: 425px) {
      .item:has(.subtitle) {
        display: flex;
        width: 100%;
        flex-wrap: wrap;
      }

      .item:has(.badge) .subtitle {
        order: 10;
        flex-basis: 100%;
      }
    }

  }

  /* tile: small bordered block, text left + image right */
  .layout-tile {
    &.flow-inline {
      gap: 0.8em 0.5em;
    }

    .item {
      max-width: 100%;
      display: inline-flex;
      align-items: center;
      justify-content: space-between;
      border: 1px solid var(--primary-color);
      overflow: hidden;
      text-decoration: none;

      img {
        width: 48px;
        height: 48px;
        margin: 0;
        &.rotate {
          transition: transform 0.15s;
          transform: rotate(-20deg) translate(-2px, 12px);
        }
      }
      .placehold {
        height: 48px;
      }

      .text {
        min-height: 48px;
        line-height: 1.5;
        padding: 0 1em;
        display: flex;
        flex-direction: column;
        justify-content: center;
        overflow: hidden;

        .title {
          font-size: 0.9em;
          color: var(--text-color);
        }

        .subtitle {
          font-size: 0.8em;
          overflow: hidden;
          text-wrap: nowrap;
          text-overflow: ellipsis;
        }
      }

      @media (hover: hover) {
        &:hover {
          opacity: unset;
          img.rotate {
            transform: rotate(0deg) translate(0px, 0px);
          }
        }
      }
    }

    a.item {
      @media (hover: hover) {
        &:hover {
          box-shadow: 0 0 0 1px var(--primary-color);
        }
      }
    }

    &.flow-stack .item {
      display: flex;
      width: 100%;
      margin: 0.5em 0;
    }

    @media (max-width: 425px) {
      .item {
        display: flex;
        width: 100%;
      }
    }
  }

  /* gallery: item with a poster image */
  .layout-gallery {
    --poster-h: 160px;
    --poster-w: 115px;

    &.flow-grid {
      grid-template-columns: repeat(auto-fill, minmax(min(150px, 100%), 1fr));
    }

    a.title {
      width: fit-content;
    }

    .image {
      flex-shrink: 0;
      width: var(--poster-w);
      height: var(--poster-h);
      img {
        height: 100%;
        width: 100%;
        object-fit: contain;
      }
    }

    .content {
      font-size: 0.9em;
      overflow: hidden;
      display: -webkit-box;
      -webkit-box-orient: vertical;
      -webkit-line-clamp: 3;
      p {
        margin: 0;
      }
    }

    .subtitle,
    .badge {
      font-size: 0.8em;
    }

    /* stack: poster left, text right */
    &.flow-stack .item {
      margin: 2em 0;
      display: flex;
      gap: 1.5em;

      .text {
        height: var(--poster-h);
        display: flex;
        flex-direction: column;
        gap: 3px;
      }
      .badge {
        margin-top: auto;
      }

      @media (max-width: 425px) {
        --poster-h: 120px;
        --poster-w: 85px;
        gap: 0.75em;
        .text {
          gap: 2px;
        }
        .subtitle,
        .badge {
          font-size: 0.7em;
        }
        .content {
          font-size: 0.8em;
          -webkit-line-clamp: 2;
        }
      }
    }

    /* grid / inline: poster on top, text centered below */
    &.flow-grid .item,
    &.flow-inline .item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1em;

      .title {
        font-size: 0.9em;
      }
      .text {
        max-width: calc(var(--poster-w) * 1.5);
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 3px;
      }

      @media (max-width: 425px) {
        --poster-h: 120px;
        --poster-w: 85px;
      }
    }
    &.flow-inline {
      gap: 1.5em 2em;
      align-items: start;
    }
  }
}

/* layout post list ( home / blog / tag )
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

.layout-list {
  .category {
    font-size: 0.9em;
    margin: 1em 15px;
    font-weight: 400;
  }

  .post-list {
    padding: 0 15px;

    &.categorized {
      margin: 1em 0 3em 0;
    }
  }

  .post {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 2em;
    padding: 0.25em 0px;
    /* margin: 0.25em 0; */
    text-decoration: none;
    color: var(--primary-color);

    border-bottom: 1.5px solid transparent;
    @media (hover: hover) {
      &:hover {
        border-bottom-color: var(--primary-color);
      }
    }

    .date {
      white-space: nowrap;
    }

    position: relative;
    &.featured::before {
      content: '*';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      transform: translate(-200%, 6px);
      height: calc(var(--line-height) * 1em);
    }
    @media (max-width: 768px) {
      &.featured::before {
        transform: translate(-150%, 6px);
      }
    }

    @media (max-width: 425px) {
      flex-direction: column-reverse;
      align-items: start;
      gap: 0.25em;
      margin: 1em 0;
      .date {
        margin-left: initial;
        color: var(--text-pale-color);
        font-size: 0.8em;
      }
      &.featured::before {
        transform: translate(-150%, 115%);
      }
    }
  }

  .read-more {
    display: flex;
    justify-content: end;
    margin: 1.5em 15px 0px;

    a {
      color: var(--primary-color);
      text-decoration: none;
      border-bottom: 1.5px solid var(--primary-color);
    }
  }
}

/* theme toggle
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

#theme-toggle {
  .sun-icon {
    display: none;
  }
}

body.dark #theme-toggle {
  .sun-icon {
    display: initial;
  }
  .moon-icon {
    display: none;
  }
}

/* homepage
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.homepage {
  #wrapper {
    min-height: 100vh;
    min-height: 100dvh;
    max-width: var(--homepage-max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  main {
    width: 100%;
    min-height: 75vh;
    min-height: 75dvh;
    padding: 4em 0;
    @media (max-width: 425px) {
      & {
        padding: 2em 0;
      }
    }
  }

  #info {
    padding: 0 15px;
    display: flex;
    align-items: center;
    gap: 1em;

    img {
      height: var(--avatar-size);
      width: var(--avatar-size);
      border-radius: 50%;
    }

    #text {
      display: flex;
      flex-direction: column;
      justify-content: space-around;
      line-height: 1.5;
      gap: 1em;
    }

    img + #text {
        gap: 0.75em;
    }

    #id {
      margin-left: 0.75em;
      color: var(--primary-color);
    }

    #bio {
      color: var(--text-pale-color);
    }
  }

  #links {
    padding: 0 15px;
    margin: 2em 0 2.5em;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1em;

    a,
    button {
      -webkit-tap-highlight-color: transparent;
      text-decoration: none;
      line-height: 0;
      color: var(--text-color);

      &:hover {
        color: var(--primary-color);
      }
    }

    #left {
      display: flex;
      flex-wrap: wrap;
      gap: 1em;

      a {
        border-bottom: 1.5px solid var(--primary-color);
        line-height: 1.5;

        &.external {
          cursor: ne-resize;
        }
      }
    }

    #right {
      display: flex;
      gap: 0.7em;

      button {
        padding: 0;
        border: none;
        background-color: transparent;
        cursor: pointer;
      }
    }

    @media (max-width: 425px) {
      #left {
        gap: 0.75em;
      }
      #right {
        gap: 0.5em;
      }
    }
  }

  #brief {
    padding: 0 15px;
  }
}

/* header
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

header {
  font-size: 0.8em;
  padding: 0 15px;
  a {
    -webkit-tap-highlight-color: transparent;
    display: inline-block;
    margin-top: 1em;
    padding: 1em 1em 1em 0;
    color: var(--text-pale-color);
    text-decoration: none;
    &:hover {
      color: var(--primary-color);
    }
  }
}

.section-title {
  padding: 0 15px;
  h1 {
    font-size: 1.15em;
    margin: 1.5em 0 0.75em;
  }
  p {
    margin: 0;
    margin-bottom: 1em;
    font-size: 0.9em;
    color: var(--text-pale-color);
  }
}

/* rss mask
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

dialog#rss-mask {
  margin: 0 auto;
  padding: 0px;
  border: none;
  overflow: visible;
  background: transparent;

  &::backdrop {
    background-color: initial;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  div {
    pointer-events: none;
    height: 100vh;
    height: 100dvh;
    padding: 2em 0;
    width: fit-content;
    display: flex;
    justify-content: center;
    align-items: end;
    flex-wrap: wrap;
    gap: 1em;
    font-size: 0.9em;
  }

  a {
    pointer-events: auto;
    border-bottom: 1.5px solid var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
    line-height: 1.5;
    line-break: anywhere;
  }

  button {
    pointer-events: auto;
    background: transparent;
    border: none;
    color: var(--text-pale-color);
    padding: 0;
    cursor: pointer;
    &.copied, &:hover {
      color: var(--primary-color);
    }
  }
}

/* footer
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

footer {
  font-size: 0.8em;
  line-height: 18px;
  margin-top: auto;
  padding: 15px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0 0.5em;
  color: var(--text-pale-color);

  .left {
    margin: 15px 0;
    margin-right: auto;
    display: flex;
    align-items: center;
    span {
      padding: 0 0.5em;
    }
    a {
      color: var(--text-pale-color);
      text-decoration: none;
      text-underline-offset: 4px;
      &:hover {
        color: var(--text-pale-color);
        text-decoration: underline;
      }
    }
  }

  .right {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 11px 0;

    #rss-btn,
    #theme-toggle {
      -webkit-tap-highlight-color: transparent;
      border: none;
      background-color: transparent;
      text-decoration: none;
      cursor: pointer;
      color: var(--text-pale-color);
      &:hover {
        color: var(--primary-color);
      }
    }

    #rss-btn {
      padding: 4px 0;
      font-size: 0.85em;
      line-height: 18px;
    }
    #theme-toggle {
      padding: 4px;
      transform: translateX(6px);
      svg {
        scale: 0.7;
      }
      line-height: 0;
    }
  }
}

/* blog page
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.blog {
  #wrapper {
    margin: 0 auto;
    max-width: var(--main-max-width);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
  }

  main {
    margin: 1em 0;
  }
}

/* post page
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.post {
  #wrapper {
    display: flex;
    justify-content: space-between;
  }

  #blank {
    order: 1;
    position: sticky;
    width: calc((100% - var(--main-max-width)) / 2);
  }

  main {
    order: 2;
    width: 100%;
    margin: 0 auto;
    max-width: var(--main-max-width);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  article {
    padding: 0 15px 2em;

    #post-info {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      margin-bottom: 1.5em;
      font-size: 0.9em;
    }

    #date {
      color: var(--text-pale-color);
      margin-bottom: 1em;

      #publish,
      #updated {
        margin-right: 1em;
      }
    }

    #tags {
      margin-bottom: 1em;
      display: flex;
      gap: 1em;
      flex-wrap: wrap;

      a {
        color: var(--primary-color);
        text-decoration: none;
        line-height: 1.25;
        span {
          font-size: 0.95em;
          margin-right: 2px;
        }

        border-bottom: 1.5px solid transparent;
        &:hover {
          opacity: 1;
          border-bottom-color: var(--primary-color);
        }
      }
    }

    #outdate_alert {
      &.hidden {
        display: none;
      }
    }
  }

  .mermaid {
    background: #fff;
  }

  .giscus {
    padding: 0 15px;
  }

  aside {
    order: 3;
    width: calc((100% - var(--main-max-width)) / 2);
    position: sticky;
    margin-top: 13em;
    top: 0;
    height: min-content;
    font-size: 0.9em;

    nav {
      padding: 10px 1em 10px 2em;
      min-width: 60%;
      overflow-y: auto;
      max-height: calc(100vh - 6em);

      scrollbar-width: none;
      &::-webkit-scrollbar {
        width: 0;
      }

      background:
        linear-gradient(var(--bg-color) 50%, transparent) center top,
        linear-gradient(transparent, var(--bg-color) 50%) center bottom,
        radial-gradient(farthest-side at 50% 0, var(--primary-decoration-color), var(--bg-color)) center top,
        radial-gradient(farthest-side at 50% 100%, var(--primary-decoration-color), var(--bg-color)) center bottom;
      background-repeat: no-repeat;
      background-size: 100% 4em, 100% 4em, 100% 1.5em, 100% 1.5em;
      background-attachment: local, local, scroll, scroll;
    }

    ul {
      list-style-type: none;
      padding: 0;
      line-height: 2;
      margin: 0;
    }

    a {
      text-decoration: none;
      display: block;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      color: var(--text-pale-color);
      position: relative;
      padding: 0 1em;

      &.h3 {
        margin-left: 1.5em;
        border-left: 1px solid var(--text-decoration-color);
      }

      &:hover {
        color: var(--primary-color);
      }
    }

    #back-to-top {
      line-height: 0;
      z-index: 99;
      position: fixed;
      bottom: 15px;
      margin-left: 1.5em;
      color: var(--text-pale-color);
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 15px;
      transform: translateY(-5px) scale(0);
      transition: transform 0.15s;

      svg {
        scale: 0.8;
      }

      &.shown {
        transform: translateY(0px) scale(1);
      }

      &:hover {
        color: var(--primary-color);
      }
    }
  }

  @media (max-width: 1024px) {
    aside, #blank {
      display: none;
    }
  }
}

/* tag list page
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.tag-list {
  #wrapper {
    margin: 0 auto;
    max-width: var(--main-max-width);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
  }

  main {
    margin: 0 15px;
  }

  .title {
    font-size: 1.15em;
    margin: 1.5em 0 0.75em;
  }

  .tags {
    margin: 2em 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1em 2em;

    a {
      color: var(--primary-color);
      text-decoration: none;
      line-height: 1.25;

      border-bottom: 1.5px solid transparent;
      &:hover {
        border-bottom-color: var(--primary-color);
      }
    }
  }

}

/* tag single page
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.tag-single {
  #wrapper {
    margin: 0 auto;
    max-width: var(--main-max-width);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
  }

  main {
    width: 100%;
    margin: 1em 0;
  }

  .title {
    font-size: 1.1em;
    margin: 0.5em 15px 2em;
  }
}

/* 404 page
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

body.not-found {
  height: 100vh;
  height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;

  .wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2em;
    margin-bottom: 6em;
  }

  .error {
    margin: 0;
    color: var(--text-pale-color);
  }

  a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1.5px solid transparent;
    &:hover {
      border-color: var(--primary-color);
    }
  }
}

/* reaction
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

.reaction {
  font-size: 0.8em;
  padding: 15px 15px 30px;
  min-height: 75px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;

  &.left {
    justify-content: start;
  }

  &.right {
    justify-content: end;
  }

  &.center {
    justify-content: center;
  }

  &.error {
    button {
      color: var(--callout-caution-color) !important;
    }
  }

  button {
    line-height: 1;
    padding: 0.5em;
    color: var(--text-pale-color);
    display: flex;
    justify-content: center;
    align-items: center;
    border: none;
    gap: 4px;
    background: transparent;
    user-select: none;
    cursor: pointer;

    span {
      min-width: 16px;
    }

    &:hover {
      color: var(--primary-color);
    }

    &.reacted {
      color: var(--primary-color);
    }
  }
}


/* normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
}

main {
  display: block;
}

h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

hr {
  box-sizing: content-box;
  height: 0;
  overflow: visible;
}

pre {
  font-family: monospace, monospace;
  font-size: 1em;
}

a {
  background-color: transparent;
}

abbr[title] {
  border-bottom: none;
  text-decoration: underline;
  text-decoration: underline dotted;
}

b,
strong {
  font-weight: bolder;
}

code,
kbd,
samp {
  font-family: monospace, monospace;
  font-size: 1em;
}

small {
  font-size: 80%;
}

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

img {
  border-style: none;
}

button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
  margin: 0;
}

button,
input {
  overflow: visible;
}

button,
select {
  text-transform: none;
}

button,
[type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
  appearance: button;
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

fieldset {
  padding: 0.35em 0.75em 0.625em;
}

legend {
  box-sizing: border-box;
  color: inherit;
  display: table;
  max-width: 100%;
  padding: 0;
  white-space: normal;
}

progress {
  vertical-align: baseline;
}

textarea {
  overflow: auto;
}

[type="checkbox"],
[type="radio"] {
  box-sizing: border-box;
  padding: 0;
}

[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto;
}

[type="search"] {
  -webkit-appearance: textfield;
  appearance: textfield;
  outline-offset: -2px;
}

[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}

details {
  display: block;
}

summary {
  display: list-item;
}

template {
  display: none;
}

[hidden] {
  display: none;
}