:root {
  --font-main:    "Noto Serif JP", serif;
  --font-heading: var(--font-main);
  --font-code:    "Fira Code", monospace;
  --content-width: 760px;
  --sidebar-width: 280px;
  --gap-width: 60px;
  --container-width: calc(var(--content-width) + var(--gap-width) + var(--sidebar-width));
}

* {
  box-sizing: border-box;
  scrollbar-width: thin;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.8;
}

h1, h2, h3, h4, h5, h6,
.article-title,
.widget-title,
.section-title {
  font-family: var(--font-heading);
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.site-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px;
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--gap-width);
  align-items: start;
}

.main-content {
  grid-column: 1;
  min-width: 0;
}

.sidebar {
  grid-column: 2;
  position: sticky;
  top: 40px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding-right: 4px;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--header-border);
}

.article-title {
  font-size: 2.2rem;
  margin: 0 0 15px 0;
  line-height: 1.3;
}

.article-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.meta-dates {
  display: flex;
  gap: 20px;
  margin-bottom: 10px;
  font-family: var(--font-code);
  flex-wrap: wrap;
}

.meta-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  padding: 2px 12px;
  border-radius: 99px;
  font-size: 0.8rem;
}

a.tag {
  color: var(--tag-text);
}

a.tag:hover {
  text-decoration: none;
  opacity: 0.8;
}

.article-abstract {
  background-color: var(--abstract-bg);
  border: 1px solid var(--abstract-border);
  border-radius: 8px;
  padding: 1.5em;
  margin-bottom: 2.5em;
}

.abstract-title {
  display: block;
  font-size: 0.9em;
  color: var(--text-muted);
  margin-bottom: 0.5em;
}

.abstract-content {
  font-size: 0.95em;
  line-height: 1.7;
}

.article-body h2 {
  margin-top: 2.5em;
  margin-bottom: 1em;
  font-size: 1.6rem;
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 5px;
}

.article-body h3 {
  margin-top: 2em;
  font-size: 1.3rem;
  border-left: 4px solid var(--accent-color);
  padding-left: 10px;
}

.article-body p {
  margin-bottom: 1.5em;
  text-align: justify;
}

.article-body a {
  overflow-wrap: anywhere;
  word-break: break-all;
}

.code-block-wrapper {
  position: relative;
}

.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--sidebar-bg);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background-color 0.15s, color 0.15s, border-color 0.15s;
}

.code-block-wrapper:hover .code-copy-btn,
.code-copy-btn:focus-visible {
  opacity: 1;
}

.code-copy-btn:hover {
  background-color: var(--card-bg);
  color: var(--text-color);
}

.code-copy-btn.copied {
  opacity: 1;
  color: var(--accent-color);
  border-color: var(--accent-color);
}

pre {
  background-color: var(--code-bg) !important;
  padding: 1em;
  border-radius: 6px;
  overflow-x: auto;
  text-align: left;
}

code {
  font-family: var(--font-code);
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  border-radius: 0;
}

blockquote {
  margin: 2em 0;
  padding: 1em 20px;
  border-left: 4px solid var(--border-color);
  background-color: var(--sidebar-bg);
  color: var(--text-muted);
}

.article-body blockquote + p {
  margin-top: -1.3em;
  padding-right: 0.25rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  text-align: right;
}

figure {
  margin: 2em 0;
  text-align: center;
  overflow-x: auto;
}

figure > img,
figure > svg {
  max-width: 100%;
  height: auto;
  background-color: var(--figure-bg);
  padding: 10px;
  border-radius: 6px;
}

figcaption {
  margin-top: 0.5em;
  font-size: 0.9em;
  color: var(--text-muted);
}

table {
  margin: 2em auto;
  border-collapse: collapse;
  width: auto;
  max-width: 100%;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  border-spacing: 0;
  overflow: hidden;
  display: inline-table;
}

thead tr {
  background-color: var(--sidebar-bg);
  color: var(--text-color);
  border-bottom: 2px solid var(--border-color);
}

th,
td {
  padding: 12px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  font-weight: bold;
  white-space: nowrap;
  color: var(--accent-color);
}

tbody tr:last-child td {
  border-bottom: none;
}

.video-wrapper {
  position: relative;
  width: 100%;
  max-width: 800px;
  margin: 2em auto;
  aspect-ratio: 16 / 9;
  background-color: var(--video-bg);
  border-radius: 8px;
  overflow: hidden;
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.mobile-toc {
  display: none;
  margin-bottom: 2rem;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.mobile-toc details {
  padding: 10px 15px;
}

.mobile-toc summary {
  cursor: pointer;
  font-weight: bold;
  color: var(--text-color);
  outline: none;
  list-style: none;
}

.mobile-toc nav {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.mobile-toc ul,
.mobile-toc ol {
  padding-left: 10px;
  list-style: none;
  margin: 0;
}

.mobile-toc nav[role="doc-toc"] li {
  margin-bottom: 7px;
  line-height: 1.4;
}

.mobile-toc nav[role="doc-toc"] a {
  display: block;
  color: var(--text-color);
}

.mobile-toc nav[role="doc-toc"] a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.mobile-toc nav[role="doc-toc"] ol ol {
  margin-top: 7px;
  margin-left: 0.2rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--border-color);
}

.mobile-toc nav[role="doc-toc"] ol ol li {
  margin-bottom: 5px;
}

.mobile-toc nav[role="doc-toc"] ol ol a {
  color: var(--text-muted);
  font-size: 0.9em;
}

.footnote-wrapper {
  position: relative;
  cursor: pointer;
  color: var(--accent-color);
  font-weight: bold;
  font-size: 0.8em;
  vertical-align: super;
  margin: 0 2px;
  user-select: none;
}

.footnote-content {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: 140%;
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 300px;
  background-color: var(--popover-bg);
  color: var(--popover-text);
  text-align: left;
  padding: 10px 15px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: normal;
  line-height: 1.5;
  z-index: 100;
  transition: opacity 0.2s, visibility 0.2s;
}

.footnote-wrapper.is-active .footnote-content {
  visibility: visible;
  opacity: 1;
}

@media (hover: hover) and (pointer: fine) {
  .footnote-wrapper:hover .footnote-content {
    visibility: visible;
    opacity: 1;
  }
}

.section-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 60px 0 40px 0;
}

.section-title {
  font-size: 1.4rem;
  margin-bottom: 25px;
  text-align: center;
}

.share-feedback-section {
  display: grid;
  gap: 40px;
  margin-bottom: 60px;
}

.share-area h3,
.feedback-area h3 {
  font-size: 1.1rem;
  margin: 0 0 15px 0;
  border-left: 4px solid var(--accent-color);
  padding-left: 10px;
}

.share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.share-btn,
.feedback-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: bold;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

.share-btn:hover,
.feedback-link:hover {
  opacity: 0.84;
  transform: translateY(-2px);
}

.btn-x {
  background-color: var(--btn-x-bg);
  color: var(--btn-x-text);
}

.btn-misskey {
  background-color: var(--btn-misskey-bg);
  color: var(--btn-misskey-text);
}

.btn-copy {
  background-color: var(--btn-copy-bg);
  color: var(--btn-copy-text);
  border: 1px solid var(--border-color);
}

.feedback-area {
  background-color: var(--sidebar-bg);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.feedback-area p {
  margin: 0 0 15px 0;
  font-size: 0.9rem;
}

.feedback-link {
  background-color: var(--card-bg);
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}

#copy-toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--toast-bg);
  color: var(--toast-text);
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 0.9rem;
  z-index: 1000;
  transition: transform 0.3s;
  pointer-events: none;
}

#copy-toast.show {
  transform: translateX(-50%) translateY(0);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.home-card-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.post-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  color: inherit;
  overflow: hidden;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--card-shadow);
  border-color: var(--accent-color);
  text-decoration: none;
}

.card-content {
  padding: 20px;
}

.card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-code);
}

.card-title {
  font-size: 1.1rem;
  font-weight: bold;
  margin: 0 0 10px 0;
  line-height: 1.4;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sidebar-widget {
  margin-bottom: 30px;
  padding: 20px;
  background-color: var(--sidebar-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.widget-title {
  font-size: 1rem;
  margin: 0 0 15px 0;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 5px;
}

.sidebar-widget nav[role="doc-toc"] ul,
.sidebar-widget nav[role="doc-toc"] ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-widget nav[role="doc-toc"] li {
  margin-bottom: 8px;
  line-height: 1.4;
}

.sidebar-widget nav[role="doc-toc"] a {
  display: block;
  color: var(--text-color);
  font-size: 0.9rem;
}

.sidebar-widget nav[role="doc-toc"] a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.sidebar-widget nav[role="doc-toc"] ol ol {
  margin-top: 7px;
  margin-left: 0.2rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--border-color);
}

.sidebar-widget nav[role="doc-toc"] ol ol li {
  margin-bottom: 5px;
}

.sidebar-widget nav[role="doc-toc"] ol ol a {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.mobile-search {
  display: none;
}

.search-input {
  width: 100%;
  min-height: 42px;
  padding: 9px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: var(--text-color);
  font: inherit;
  line-height: 1.4;
}

.search-input:focus {
  border-color: var(--accent-color);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-status {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

.search-status[hidden] {
  display: none;
}

.search-results {
  display: grid;
  gap: 10px;
  margin: 14px 0 0 0;
  padding: 0;
  list-style: none;
}

.search-result-link {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  color: inherit;
}

.search-result-link:hover {
  border-color: var(--accent-color);
  text-decoration: none;
}

.search-result-title {
  display: block;
  color: var(--text-color);
  font-weight: bold;
  font-size: 0.92rem;
  line-height: 1.4;
}

.search-result-excerpt {
  display: block;
  margin-top: 5px;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.search-result-excerpt mark {
  padding: 0 0.18em;
  border-radius: 3px;
  background-color: var(--mark-bg);
  color: var(--text-color);
}

.reference-preview {
  display: none;
}

.reference-preview.is-open {
  display: block;
}

.reference-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 15px;
  padding-bottom: 5px;
  border-bottom: 2px solid var(--border-color);
}

.reference-preview-title {
  margin: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.reference-preview-close {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background-color: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.reference-preview-body {
  max-height: 45vh;
  overflow-y: auto;
  padding-right: 4px;
  color: var(--text-color);
  font-size: 0.88rem;
  line-height: 1.55;
}

.reference-preview-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.reference-preview-entry {
  margin: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

a[role="doc-biblioref"].biblioref-is-active {
  border-radius: 4px;
  background-color: var(--biblioref-active-bg);
  color: var(--biblioref-active-text);
  text-decoration: none;
}

.markdown-alert {
  padding: 16px;
  margin-bottom: 24px;
  border-left: 4px solid var(--border-color);
  background-color: var(--card-bg);
  border-radius: 6px;
  border-right: 1px solid var(--border-color);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.markdown-alert-title {
  display: flex;
  align-items: center;
  font-weight: bold;
  font-size: 0.95rem;
  margin: 0 0 8px 0;
  line-height: 1;
}

.markdown-alert-icon {
  margin-right: 8px;
  font-family: var(--font-code);
  font-size: 0.9em;
}

.markdown-alert-content > *:first-child {
  margin-top: 0;
}

.markdown-alert-content > *:last-child {
  margin-bottom: 0;
}

.markdown-alert-note {
  border-left-color: var(--color-note-border);
  background-color: var(--color-note-bg);
}

.markdown-alert-note .markdown-alert-title {
  color: var(--color-note-text);
}

.markdown-alert-tip {
  border-left-color: var(--color-tip-border);
  background-color: var(--color-tip-bg);
}

.markdown-alert-tip .markdown-alert-title {
  color: var(--color-tip-text);
}

.markdown-alert-important {
  border-left-color: var(--color-important-border);
  background-color: var(--color-important-bg);
}

.markdown-alert-important .markdown-alert-title {
  color: var(--color-important-text);
}

.markdown-alert-warning {
  border-left-color: var(--color-warning-border);
  background-color: var(--color-warning-bg);
}

.markdown-alert-warning .markdown-alert-title {
  color: var(--color-warning-text);
}

.markdown-alert-caution {
  border-left-color: var(--color-caution-border);
  background-color: var(--color-caution-bg);
}

.markdown-alert-caution .markdown-alert-title {
  color: var(--color-caution-text);
}

.back-home-btn {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: bold;
  color: var(--text-muted);
  background-color: transparent;
  border: 1px solid var(--border-color);
  border-radius: 99px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.back-home-btn:hover {
  color: var(--accent-color);
  border-color: var(--accent-color);
  background-color: var(--card-bg);
  text-decoration: none;
  transform: translateX(-4px);
}

.author-links {
  display: flex;
  gap: 12px;
  margin-top: 15px;
  flex-wrap: wrap;
}

.author-icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: transparent;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.author-icon-link svg {
  width: 18px;
  height: 18px;
  fill: var(--text-muted);
  transition: fill 0.2s ease;
}

.author-icon-link:hover {
  background-color: var(--card-bg);
  border-color: var(--border-color);
  transform: translateY(-2px);
}

.author-icon-link:hover .icon-x,
.author-icon-link:hover .icon-github {
  fill: var(--text-color);
}

.author-icon-link:hover .icon-misskey {
  fill: var(--author-misskey-hover);
}

p,
h1,
h2,
h3,
h4,
li,
.article-abstract {
  word-break: auto-phrase;
}

@media (min-width: 1300px) {
  .site-container {
    max-width: none;
    grid-template-columns: 1fr var(--content-width) 1fr;
    gap: 0;
  }

  .main-content {
    grid-column: 2;
  }

  .sidebar {
    grid-column: 3;
    width: var(--sidebar-width);
    margin-left: var(--gap-width);
    justify-self: start;
  }
}

@media (max-width: 1080px) {
  .home-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .site-container {
    display: block;
    padding: 20px 15px;
  }

  .main-content {
    margin-bottom: 60px;
  }

  .sidebar {
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    padding-right: 0;
    margin-left: 0;
    width: 100%;
    max-height: none;
    overflow-y: visible;
    position: static;
  }

  .article-title {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .mobile-toc {
    display: block;
  }

  .mobile-search {
    display: block;
    margin-bottom: 2rem;
  }

  .desktop-search {
    display: none;
  }

  .sidebar-widget.toc-widget {
    display: none;
  }

  .footnote-content {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    transform: none;
    width: auto;
    max-width: none;
    z-index: 9999;
    border: 1px solid var(--border-color);
  }

  .reference-preview {
    position: fixed;
    right: 15px;
    bottom: 15px;
    left: 15px;
    z-index: 9998;
    max-height: 55vh;
    margin: 0;
  }

  .reference-preview-body {
    max-height: 38vh;
  }
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 40px;
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 0 1 calc(50% - 8px);
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.post-nav-link:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--card-shadow);
  text-decoration: none;
}

.post-nav-prev {
  text-align: left;
}

.post-nav-next {
  text-align: right;
  margin-left: auto;
}

.post-nav-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-nav-title {
  font-size: 0.95rem;
  font-weight: bold;
  color: var(--text-color);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 600px) {
  .post-nav {
    flex-direction: column;
  }

  .post-nav-link {
    flex: none;
    width: 100%;
  }

  .post-nav-next {
    margin-left: 0;
  }
}

.tag-page-prefix {
  color: var(--text-muted);
  font-size: 0.6em;
}

.tag-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.tag-index-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.tag-index-item:hover {
  text-decoration: none;
  opacity: 0.85;
}

.tag-count {
  display: inline-block;
  background-color: var(--text-muted);
  color: var(--bg-color);
  border-radius: 99px;
  font-size: 0.75em;
  padding: 1px 7px;
  line-height: 1.5;
}