/* =========================
   Post Cover
   ========================= */

.img-container {
  width: 100%;
  margin-bottom: var(--space-24);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-image);
}

.post-cover {
  display: block;
  width: 100%;
  height: auto;
  border-radius: inherit;
}

/* =========================
   post content
   ========================= */

article.card {
  padding: 5.34em 6.67em;
  font-size: 1.0625rem;
  line-height: 1.8;
}

article.card .post-header-meta,
article.card .post-taxonomy,
article.card .post-header-date {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4) var(--space-8);
  color: var(--color-text-secondary);
  font-size: var(--font-size-root);
  line-height: 1.5;
}

article.card .post-header-meta {
  margin: var(--space-12) var(--space-0) var(--space-24);
}

article.card .post-taxonomy a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

article.card .post-taxonomy a:hover {
  color: var(--color-action-primary-hover);
}

article.card .post-taxonomy a:focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

article.card .post-header-date {
  margin: 0;
}

article.card .post-header-date svg {
  flex: 0 0 auto;
  width: var(--space-16);
  height: var(--space-16);
}

article img:not(.post-cover) {
  display: block;
  margin: 2rem auto;
  max-width: 100%;
  max-height: 70vh;
  width: auto;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-image);
}

article.markdown-body img.post-image-preview {
  cursor: pointer;
}

article.markdown-body img.post-image-preview:focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

/* =========================
   Post Image Gallery
   ========================= */

.post-image-dialog {
  position: fixed;
  inset: var(--space-0);
  width: 100vw;
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: var(--space-0);
  padding: var(--space-0);
  border: var(--space-0);
  border-radius: var(--space-0);
  background-color: rgba(0, 0, 0, 0.64);
  color: var(--color-white);
  overflow: hidden;
}

.post-image-dialog:not([open]) {
  display: none;
}

.post-image-dialog::backdrop {
  background-color: transparent;
}

html.post-image-dialog-open {
  overflow: hidden;
}

.post-image-dialog-viewer {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: 100%;
  height: 100%;
}

.post-image-dialog-viewer:fullscreen {
  background-color: rgba(0, 0, 0, 0.8);
}

.post-image-dialog-toolbar {
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--space-64);
  padding: var(--space-8) var(--space-16);
  background-color: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  font-family: var(--font-family-ui);
}

.post-image-dialog-counter {
  margin: var(--space-0);
  font-size: var(--font-size-root);
  font-variant-numeric: tabular-nums;
}

.post-image-dialog-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.post-image-dialog-action,
.post-image-dialog-edge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--space-48);
  min-width: var(--space-48);
  height: var(--space-48);
  min-height: var(--space-48);
  padding: var(--space-0);
  border: var(--space-0);
  border-radius: var(--space-0);
  background-color: transparent;
  color: inherit;
  cursor: pointer;
}

.post-image-dialog-action:hover,
.post-image-dialog-edge:hover {
  background-color: var(--color-overlay-light);
}

.post-image-dialog-action:focus-visible,
.post-image-dialog-edge:focus-visible {
  outline: var(--space-4) solid var(--color-white);
  outline-offset: calc(var(--space-4) * -1);
}

.post-image-dialog-action svg,
.post-image-dialog-edge svg {
  width: var(--space-24);
  height: var(--space-24);
}

.post-image-dialog-stage {
  --post-image-dialog-dismiss-offset: 0px;
  --post-image-dialog-dismiss-opacity: 1;
  position: relative;
  width: 100%;
  height: auto;
  min-width: var(--space-0);
  min-height: var(--space-0);
  padding: var(--space-16);
  overflow: hidden;
  transform: translate3d(0, var(--post-image-dialog-dismiss-offset), 0);
  opacity: var(--post-image-dialog-dismiss-opacity);
  will-change: transform, opacity;
  touch-action: none;
}

.post-image-dialog-stage.is-dismiss-settling {
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.post-image-dialog-track {
  display: flex;
  width: 300%;
  height: 100%;
  transform: translate3d(-33.333333%, 0, 0);
  will-change: transform;
}

.post-image-dialog-track.is-settling {
  transition: transform 0.2s ease;
}

.post-image-dialog-slide {
  display: grid;
  flex: 0 0 calc(100% / 3);
  place-items: center;
  min-width: var(--space-0);
  min-height: var(--space-0);
}

.post-image-dialog-image {
  display: block;
  max-width: none;
  max-height: none;
  margin: var(--space-0);
  border-radius: var(--space-0);
  box-shadow: none;
  object-fit: contain;
  transform-origin: center;
  user-select: none;
  -webkit-user-drag: none;
  transition: transform 0.2s ease;
}

.post-image-dialog-edge {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.post-image-dialog-previous {
  left: var(--space-16);
}

.post-image-dialog-next {
  right: var(--space-16);
}

.post-image-dialog-toolbar,
.post-image-dialog-edge {
  opacity: 1;
  transition: opacity 0.2s ease;
}

.post-image-dialog-controls-hidden .post-image-dialog-toolbar,
.post-image-dialog-controls-hidden .post-image-dialog-edge {
  opacity: 0;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .post-image-dialog-slide--current .post-image-dialog-image.is-zoom-eligible {
    cursor: zoom-in;
  }

  .post-image-dialog-stage.is-zoomed,
  .post-image-dialog-slide--current .post-image-dialog-image.is-zoomed {
    cursor: grab;
  }

  .post-image-dialog-stage.is-zoomed:active,
  .post-image-dialog-slide--current .post-image-dialog-image.is-zoomed:active {
    cursor: grabbing;
  }

  .post-image-dialog-zoom.is-zoomed {
    cursor: zoom-out;
  }
}

/* =========================
   Post Sharing
   ========================= */

.post-share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-12);
  margin-top: var(--space-24);
  color: var(--color-text-primary);
  font-family: var(--font-family-ui);
}

.post-share-title {
  color: var(--color-text-secondary);
  font-size: var(--font-size-root);
  font-weight: inherit;
  line-height: 1.5;
}

.post-share-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  min-width: 0;
}

.post-share-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--space-48);
  padding: var(--space-8) var(--space-16);
  border: 0;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-text-secondary);
  font: inherit;
  font-weight: var(--font-weight-semibold);
  line-height: 1.5;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.post-share-button--primary {
  background-color: var(--color-action-primary);
  color: var(--color-white);
}

.post-share-button:hover {
  background-color: var(--color-background-surface-softer);
  color: var(--color-action-primary-hover);
}

.post-share-button--primary:hover {
  background-color: var(--color-action-primary-hover);
  color: var(--color-white);
}

.post-share-button:focus-visible,
.post-share-url:focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

.post-share-status {
  position: absolute;
  width: var(--space-1px);
  height: var(--space-1px);
  padding: var(--space-0);
  margin: calc(var(--space-1px) * -1);
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.post-share-fallback {
  display: flex;
  flex: 1 1 100%;
  flex-direction: column;
  min-width: 0;
  gap: var(--space-8);
  color: var(--color-text-secondary);
  font-size: var(--font-size-root);
  line-height: 1.5;
}

.post-share-fallback[hidden] {
  display: none;
}

.post-share-url {
  min-width: 0;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  border: var(--space-1px) solid var(--color-border-light);
  border-radius: var(--radius-md);
  background-color: var(--color-background-surface);
  color: var(--color-text-primary);
  font: inherit;
  line-height: 1.5;
}

.post-lastmod {
  width: 100%;
  margin: 1rem 0 1.5rem;
  padding: 1rem 1.25rem;

  background: linear-gradient(90deg, var(--color-callout-updated-start) 0%, var(--color-callout-updated-end) 100%);
  color: var(--color-white);

  text-align: center;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.03em;

  border: 1px solid var(--color-callout-updated-border);
  border-radius: 10px;
}

/* =========================
   Post Navigation
   ========================= */

.post-navigation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-12);
  margin-top: var(--space-40);
  padding-top: var(--space-24);
  border-top: var(--space-1px) solid var(--color-border-light);
  font-family: var(--font-family-ui);
}

.post-navigation--single {
  grid-template-columns: minmax(0, 1fr);
}

.post-share + .post-navigation {
  margin-top: var(--space-24);
}

.post-navigation-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-12);
  border: var(--space-1px) solid var(--color-border-light);
  background-color: var(--color-background-surface-muted);
  color: var(--color-text-primary);
  text-decoration: none;
}

.post-navigation-link--next {
  text-align: right;
}

.post-navigation-label {
  color: var(--color-text-secondary);
  font-size: var(--font-size-root);
  font-weight: var(--font-weight-semibold);
}

.post-navigation-title {
  font-weight: var(--font-weight-semibold);
}

.post-navigation-link:hover {
  background-color: var(--color-background-surface-softer);
  color: var(--color-action-primary-hover);
}

.post-navigation-link:focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

/* =========================
   Back to Top
   ========================= */

.post-back-to-top {
  position: fixed;
  right: var(--space-24);
  bottom: var(--space-24);
  z-index: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-48);
  min-width: var(--space-48);
  height: var(--space-48);
  min-height: var(--space-48);
  padding: var(--space-0);
  border: var(--space-1px) solid var(--color-action-primary);
  border-radius: var(--radius-md);
  background-color: var(--color-action-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.post-back-to-top[hidden] {
  display: none;
}

.post-back-to-top svg {
  width: var(--space-24);
  height: var(--space-24);
}

.post-back-to-top:hover {
  background-color: var(--color-action-primary-hover);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(calc(var(--space-4) * -1));
}

.post-back-to-top:focus-visible {
  outline: var(--space-4) solid var(--color-link-primary);
  outline-offset: var(--space-4);
}

/* =========================
   Heimu
   ========================= */

.markdown-body .heimu,
.markdown-body .heimu a,
.markdown-body a .heimu,
.markdown-body .heimu a.new {
  background-color: #252525;
  color: #252525;
  text-shadow: none;
}

.markdown-body .heimu:hover,
.markdown-body .heimu:active,
.markdown-body .heimu:hover .heimu,
.markdown-body .heimu:active .heimu {
  color: var(--color-white) !important;
}

.markdown-body .heimu:hover a,
.markdown-body a:hover .heimu,
.markdown-body .heimu:active a,
.markdown-body a:active .heimu {
  color: lightblue !important;
}

.markdown-body .heimu:hover .new,
.markdown-body .heimu .new:hover,
.markdown-body .new:hover .heimu,
.markdown-body .heimu:active .new,
.markdown-body .heimu .new:active,
.markdown-body .new:active .heimu {
  color: #ba0000 !important;
}

/* =========================
   Table of Contents
   ========================= */

.toc {
  margin: 0;
  padding: var(--space-16) var(--space-20);
  border: 0.0625rem solid var(--color-border-light);
  border-radius: 0;
  background-color: var(--color-background-surface-muted);
}

.toc ul {
  list-style: none;
  padding-left: var(--space-32);
  counter-reset: section1;
}

.toc-panel {
  margin-top: var(--space-12);
}

.toc-toggle {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--font-size-toc-toggle);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: left;
  cursor: pointer;
}

.toc-toggle::after {
  content: "";
  float: right;
  width: var(--size-toc-marker);
  height: var(--size-toc-marker);
  margin-top: var(--space-8);
  margin-left: var(--space-12);
  border-right: var(--size-toc-marker-stroke) solid var(--color-text-secondary);
  border-bottom: var(--size-toc-marker-stroke) solid var(--color-text-secondary);
  transform: rotate(45deg);
  transition: transform 0.18s ease;
}

.toc-toggle[aria-expanded="false"]::after {
  transform: rotate(-45deg);
}

.toc li + li {
  margin-top: var(--space-8);
}

.toc a,
.toc a:visited,
.toc a:hover,
.toc a:active,
.markdown-body .toc a,
.markdown-body .toc a:visited,
.markdown-body .toc a:hover,
.markdown-body .toc a:active {
  display: inline-block;
  color: inherit;
  text-decoration: none;
  line-height: 1.5;
  transition: color 0.18s ease;
}

.toc .lvl-2 {
  color: var(--color-link-level-2);
  font-size: var(--font-size-toc-level-2);
  font-weight: 700;
  counter-increment: section1;
  counter-reset: section2;
}

.toc .lvl-3 {
  padding-left: var(--space-32);
  margin-top: var(--space-4);
  color: var(--color-link-level-3);
  font-size: var(--font-size-toc-level-3);
  font-weight: 700;
  counter-increment: section2;
}

.toc .lvl-2::before,
.toc .lvl-3::before {
  padding-right: var(--space-8);
  color: var(--color-text-secondary);
}

.toc .lvl-2::before {
  content: counter(section1);
  position: relative;
  font-size: var(--font-size-toc-level-2-marker);
}

.toc .lvl-3::before {
  content: counter(section1) "." counter(section2);
  font-size: var(--font-size-toc-level-3-marker);
}

@media (max-width: 48rem) {
  article.card {
    padding: var(--space-24);
  }

  article.card .post-header-meta,
  article.card .post-taxonomy {
    align-items: flex-start;
  }

  article.card .post-header-date {
    align-items: center;
  }

  .toc {
    padding: var(--space-12) var(--space-16);
  }

  .post-back-to-top {
    right: var(--space-16);
    bottom: var(--space-16);
  }

  .post-image-dialog-edge {
    display: none;
  }

  .post-image-dialog-toolbar,
  .post-image-dialog-controls-hidden .post-image-dialog-toolbar {
    opacity: 1;
    pointer-events: auto;
    transition: none;
  }

}

@media (prefers-reduced-motion: reduce) {
  .skip-link,
  button.menu-btn,
  button.search-btn,
  .mobile-menu,
   .mobile-menu.is-open,
    .toc-toggle::after,
    .toc a,
    .post-navigation-link,
     .post-share-button,
       .post-back-to-top,
       .post-image-dialog-toolbar,
         .post-image-dialog-edge,
         .post-image-dialog-image,
         .post-image-dialog-stage,
         .post-image-dialog-track {
    transition: none;
  }

  .post-back-to-top:hover {
    transform: none;
  }
}