/* global */

:root {
  /* colors */
  --background-color: #F5F5F7;
  --block-background-color: #E9E8ED;
  --border-color: #d0d7de;
  --text-color: #1D1D1F;
  --secondary-text-color: #6E6E73;
  --link-color: #277BD9;

  --strong-text-color: #B6506A;
  --em-text-color: #0271A4;

  /* fonts */
  --mono-font-family: "Courier New", Courier, "Menlo", "Monaco", Consolas, "Liberation Mono", "Lucida Console", monospace;
  --serif-font-family:  "Noto Serif SC", serif;
  --content-font-size: 20px;

  /* waline */
  --waline-font-size: 20px;
  --waline-border-color: var(--border-color);
  --waline-bg-color: var(--background-color);

  --page-width: 700px;
}

.dark {
  --background-color: #1D2021;
  --block-background-color: #181A1B;
  --border-color: rgba(255,255,255,0.2);
  --text-color: #D2CEC9;
  --secondary-text-color: #A1998D;
  --link-color: #277BD9
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1D2021;
    --block-background-color: #181A1B;
    --border-color: rgba(255,255,255,0.2);
    --text-color: #D2CEC9;
    --secondary-text-color: #A1998D;
    --link-color: #277BD9;
  }
}

body {
  font-family: var(--serif-font-family);
  -webkit-font-smoothing: antialiased;
  margin: 0 20px;
  color: var(--text-color);
  position: relative;
  /* background */
  background-image: linear-gradient(to bottom, var(--block-background-color), transparent);
  background-size: 100% 5rem;
  background-position: top left;
  background-repeat: no-repeat;
  background-color: var(--background-color);
}

article {
  max-width: var(--page-width);
  margin: 0 auto
}

a {
  color: var(--text-color);
  text-decoration: none;
  text-underline-offset: 0.25rem;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style-type: square;
}

.markdown-body {
  font-size: var(--content-font-size);
  max-width: 100%;
}

.markdown-body a {
  text-decoration: underline;
  color: var(--link-color);
}

.markdown-body blockquote {
  margin: 0;
  padding: 0 1em;
  color: var(--secondary-text-color);
  border-left: 0.25em solid var(--border-color);
}

.markdown-body pre {
  padding: 16px;
  overflow: auto;
  border-radius: 10px;
}

.markdown-body code {
  padding: 0.2em 0.4em;
  font-size: 85%;
  background-color: var(--block-background-color);
  border-radius: 6px;
}

.markdown-body img {
    max-width: 100%
}

/* reset code */

.markdown-body pre > code {
  padding: 0;
  font-size: 100%;
  background-color: inherit;
  border: 0;
}

/* i18n */

.Chinese .markdown-body {
  line-height: 200%;
}

/* header */

.site-date-catalog {
  font-size: 2rem;
}

.header-title {
  font-size: 2rem;
  font-weight: 900;
  margin-top: 32px;
  text-align: center;
  letter-spacing: .15rem;
}
.header-title a {
  text-decoration: none;
}

.header-subtitle {
  color: var(--secondary-text-color);
}

.header-items {
  margin: 1rem auto;
  display: flex;
  justify-content: center;
  align-items: center;
  width: fit-content;
  border-radius: 1rem;
  overflow: hidden;
}

.header-item a {
  display: inline-block;
  color: var(--background-color);
  padding: 0.25rem 0.5rem;
  background-color: var(--text-color);
}

.header-item:first-child a {
  padding-left: 0.75rem
}

.header-item:last-child a {
  padding-right: 0.75rem
}

.header-item.active a {
  color: var(--text-color);
  background-color: var(--block-background-color);
}

.header-item a:hover {
  text-decoration: none;
}

.header-line {
  width: 100%;
  border-width: 1px;
  border-color: var(--border-color);
  border-style: solid none none none;
}

/* posts list */

#posts-list {
  min-height: 600px;
}

#posts-list ul {
  list-style-type: none;
  padding-inline-start: 1em;
}

.featured-post a.posts-title-link {
  font-weight: 800;
  display: block;
}

.posts-line {
  font-size: 1.2rem;
  margin: 12px 0;
}

#posts-list > section:nth-child(1) > ul:nth-child(3) > li.first-post > div > div.posts-title.col-xs-9.col-sm-10 > div {
  align-items: flex-start;
}

.posts-categories {
  font-size: 0.8rem;
  text-align: center;
}

.posts-category {
  padding: 3px 0;
  border: var(--border-color) 2px solid;
  border-radius: 5px;
  background-color: var(--background-color);
}

.posts-date {
  font-family: var(--mono-font-family);
  color: var(--secondary-text-color)
}

.posts-year-section {
  --section-height: 9rem;
  min-height: var(--section-height);
  position: relative;
  margin: 2rem 0;
}

.posts-year-title {
  font-weight: 900;
  position: absolute;
  right: 0;
  color: var(--text-color);
  opacity: 0.25;
  font-size: calc(var(--section-height) / 2);
  margin: 0;
  line-height: 1;
  z-index: -1;
}

#posts-list hr {
  border: 1px solid var(--border-color);
  margin: 3rem 0;
}

.posts-subtitle {
  color: var(--secondary-text-color)
}

.site-footer {
  margin-top: 50px;
  text-align: center;
}

.site-footer-item {
  margin-right: 12px;
}

/* post */

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 2rem;
  font-weight: 900;
}

.post-subtitle {
  display: block;
  color: var(--secondary-text-color);
  font-style: italic;
  font-size: 1.2rem;
}

.post-tags a {
  display: inline-block;
  color: var(--secondary-text-color);
  font-size: var(--content-font-size);
}

.post-date {
  color: var(--secondary-text-color)
}

.post-author {
  float: right;
  font-weight: 600;
}

.page-content {
  min-height: 60%;
}

.post-content {
  margin-bottom: 50px;
  line-height: 2
}

.post-content p {
  hyphens: auto;
  text-justify: ideographic;
  margin-bottom: 1em;
}

.post-content strong {
  color: var(--strong-text-color)
}

.post-content em {
  color: var(--em-text-color)
}

.post-content hr {
  margin: 2.5rem auto;
  border: 0.1rem dashed var(--border-color);
}

.post-content img {
  max-width: 100%;
  display: block;
  margin-right: auto;
  margin-top: 6px;
}

.post-content .post-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.post-content .post-gallery img {
  margin-right: auto;
  margin-top: auto;
  width: calc(50% - 3px);
}

.post-content figure {
  margin: 0;
}

.post-content figure figcaption h4 {
  font-size: 0.9rem;
  color: var(--secondary-text-color);
  font-weight: 400;
}

.related-content {
  border-width: 3px;
  border-style: solid;
  border-color: #000;
  padding: 0 10px;
  margin-bottom: 50px;
  margin-top: 100px;
}

.related-content li {
  margin: 5px 0;
}

/* termlist */

.termlist-title {
  font-size: 2rem;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;

  background-color: var(--block-background-color);
  padding: 0.5rem 1rem;
  border-radius: 1rem;
  width: fit-content;
  margin: 2rem auto
}

.termlist-title::before,
.termlist-title::after {
  margin: 0.5rem;
  color: var(--secondary-text-color);
  font-size: 0.75em
}

.termlist-title::before {
  content: "《";
}

.termlist-title::after {
  content: "》";
}

/* category page */

section.taxonomy {
    margin: 2rem 0;
}

.taxonomy-categories {
    --gap: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap);
}

.taxonomy-categories-item {
    width: calc(50% - var(--gap))
}

.taxonomy-tags-item {
    display: inline-flex;
    align-items: center;
    gap: .3rem;

    padding: .25rem .75rem;
    background-color: var(--block-background-color);
    transition: color, background .3s;
    border-radius: .3rem;
}

.taxonomy-tags-item:hover {
    text-decoration: none;
    background-color: var(--text-color);
    color: var(--block-background-color);
}

.taxonomy-tags-item .tag-count {
    font-size: .8rem;
    color: var(--secondary-text-color);
}

/* gallery */

.gallery-img {
  text-align: center;
}

.gallery-img span {
  text-align: center;
}

.gallery-img-desc {
  font-size: 0.8em;
  font-weight: 800;
}

@media screen and (max-width: 600px) {
  .posts-line {
    font-size: 16px;
  }

  .markdown-body {
    font-size: 16px;
  }
  .post-title {
    font-size: 2rem;
  }
  .post-content p {
    letter-spacing: 0.05em;
  }
  .post-content .post-gallery img {
    width: 100%;
  }
}

@media screen and (max-width: 48em) {
  .posts-category {
    display: none;
  }
}

/* callouts */

.callout {
  background-color: var(--block-background-color);
  border-radius: .25rem;
  padding: 1rem 1.25rem;
  line-height: 1.75;

  display: flex;
  gap: .75rem;

  margin: 0.5rem 0;
}

.callout .callout-content p {
  margin: 0;
}

/* quote shortcode */

.quote-card {
  --card-bg: rgba(255,255,255,0.25);
  --card-bg-lighter: rgba(255,255,255,0.1);
  --card-noise: rgba(255,255,255,0.04);

  font-size: 1.5rem;
  font-style: italic;
  text-align: center;
  margin: 5rem 3rem;
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: 0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;
  transform: rotate(3deg);
  background-color: rgba(255,255,255,0.35);

  background: linear-gradient(var(--card-bg-lighter), var(--card-bg-lighter)),
    repeating-radial-gradient(var(--card-bg) 0 0.0001%, var(--card-noise) 0 0.0002%) 50% 0 / 2500px 2500px,
    repeating-conic-gradient(var(--card-bg) 0 0.0001%, var(--card-noise) 0 0.0002%) 60% 60% / 2500px 2500px;
  background-blend-mode: normal, difference;
}

@media screen and (max-width: 768px) {
  .quote-card {
    font-size: 1.2rem;
    margin: 3rem 1rem;
  }
}

/* blog links */

div.blog-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

a.blog-link {
  position: relative;
  background-color: var(--block-background-color);
  text-decoration: none;
  color: var(--text-color);
  padding: 1rem 2rem;
  padding-right: 4rem;
  border-radius: 1rem;
  width: calc(50% - 2rem);
  box-sizing: border-box;
  overflow: hidden
}

@media screen and (max-width: 768px) {
  a.blog-link {
    font-size: 1.2rem;
    padding: 0.5rem 1rem;
    padding-right: 2rem;
    width: 100%;
  }
}

a.blog-link h4,
a.blog-link p {
  margin: 0;
  font-size: 1.2rem;
}

a.blog-link p {
  line-height: 1.5;
}

a.blog-link .blog-link-content {
  z-index: 10;
}

a.blog-link-image {
  z-index: 0;
}

a.blog-link img {
  --size: 5rem;
  display: block;
  position: absolute;
  right: -1rem;
  bottom: -1rem;
  width: var(--size);
  height: var(--size);
  border-radius: 100%;
  z-index: 0;
}

/* book showcase shortcode */

.book-showcase {
    display: flex;
    gap: 2rem;
    line-height: 1.5;
    margin: 2rem 0
}

.book-showcase .book-cover {
    width: 25%;
    flex-shrink: 0;
}

.book-description-header .book-title {
    margin: 0
}

.book-description-header p {
    font-size: 1rem;
    margin: 0.1rem
}

/* inline-image shortcode */

.inline-image {
  display: flex;
  overflow-x: auto;
  scroll-behavior: smooth;
  gap: 1rem;
  white-space: nowrap;
}

.inline-image > figure {
  display: inline-block;
  margin: 0;
  flex-shrink: 0;
}

.inline-image > figure img {
  height: 20rem;
  object-fit: cover;
  display: block;
}

/* sidenote shortcode */

@media screen and (max-width: 1199px) {
    .sidenote {
        border: 1px solid var(--block-background-color);
        padding: .75rem 1rem;
        border-radius: 0.5rem;
        line-height: 1.5;
    }
    .sidenote-title {
        font-size: 1rem;
        text-align: right;
        font-style: italic
    }
}

@media screen and (min-width: 1200px) {
    .sidenote {
        position: absolute;
        left: calc(50% + var(--page-width) / 2);
        margin-left: 2rem;
        max-width: 20rem
    }
}

.sidenote-title {
    margin: 0.5rem 0
}

.sidenote-content {
    font-size: 1rem
}

/* toc */

#toc-container {
    position: absolute;
    bottom: 0;
    right: calc(50% + var(--page-width) / 2);
    left: auto;
    height: 100%;
    top: 12rem;
}

@media screen and (max-width: 1200px) {
    #toc-container {
        display: none
    }
}

#toc {
    /* position */
    position: sticky;
    top: 3rem;
    /* styling */
    font-size: 1rem;
    padding: 0 2rem;
}

@media screen and (max-width: 1700px) {
    #toc {
        font-size: 0.9rem;
    }
}

@media screen and (max-width: 1500px) {
    #toc {
        font-size: 0.825rem;
    }
}

#toc ul, #toc ol {
    margin-block-start: 0;
    margin-block-end: 0;
    padding-inline-start: 1rem;
}

#toc li {
    list-style: none;
}

#toc li > a {
    color: var(--secondary-text-color);
    text-decoration: none;
    transition: color .3s;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
}

#toc li > a::before {
    content: '';
    display: inline-block;
    width: 1rem;
    height: .3rem;
    background-color: var(--block-background-color);
    border-radius: .2rem;
    transition: background .3s;
}

#toc li a:hover,
#toc li.is-active-li > a {
    color: var(--text-color);
}

#toc li.is-active-li > a::before {
    background-color: var(--secondary-text-color);
}

#toc .toc-list {
	overflow: hidden;
	position: relative;
}

#toc .toc-list .toc-list {
    max-height: 25rem;
	overflow-y: auto
}

#toc .toc-list.is-collapsed {
	max-height: 0
}

/* transition swup */

html.is-changing .transition-fade {
  transition: opacity 0.25s;
  opacity: 1;
}
html.is-animating .transition-fade {
  opacity: 0;
}