.markdown-viewer {
  --viewer-accent: var(--post-link-color);
  max-width: 1180px;
  margin: 0 auto;
}

.markdown-viewer__controls {
  margin: 0 auto 2rem;
  padding: 1.5rem;
  border: 1px solid var(--line-color);
  border-radius: 0.75rem;
  background: var(--board-bg-color);
}

.markdown-viewer__intro h2 { margin-top: 0; }
.markdown-viewer__intro p { margin-bottom: 1.25rem; color: var(--sec-text-color); }

.markdown-viewer__dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  min-height: 8rem;
  padding: 1rem;
  border: 2px dashed var(--line-color);
  border-radius: 0.65rem;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.markdown-viewer__dropzone.is-dragging {
  border-color: var(--viewer-accent);
  background: color-mix(in srgb, var(--viewer-accent) 8%, transparent);
}

.markdown-viewer__file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.markdown-viewer__choose,
.markdown-viewer__button {
  min-height: 2.75rem;
  padding: 0.62rem 1rem;
  border: 1px solid var(--viewer-accent);
  border-radius: 0.45rem;
  background: var(--viewer-accent);
  color: var(--site-on-accent);
  cursor: pointer;
  font: inherit;
  line-height: 1.3;
}

.markdown-viewer__choose:hover,
.markdown-viewer__button:hover { filter: brightness(1.08); }
.markdown-viewer__file-input:focus-visible + .markdown-viewer__choose,
.markdown-viewer__choose:focus-visible,
.markdown-viewer__button:focus-visible { outline: 3px solid color-mix(in srgb, var(--viewer-accent) 35%, transparent); outline-offset: 2px; }

.markdown-viewer__button--quiet {
  background: transparent;
  color: var(--viewer-accent);
}

.markdown-viewer__toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.markdown-viewer__toolbar[hidden] { display: none; }
.markdown-viewer__filename { min-width: 0; margin-right: auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.markdown-viewer__status { margin: 0.8rem 0 0; color: var(--sec-text-color); }
.markdown-viewer__status.is-error { color: var(--site-error); }

.markdown-viewer__reading {
  display: grid;
  grid-template-columns: minmax(11rem, 15rem) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.markdown-viewer__reading[hidden] { display: none; }
.markdown-viewer__article { min-width: 0; max-width: 850px; width: 100%; margin: 0 auto; }
.markdown-viewer__document-title { margin: 0 0 1.6rem; text-align: center; overflow-wrap: anywhere; }

.markdown-viewer__toc {
  position: sticky;
  top: 5.5rem;
  max-height: calc(100vh - 7rem);
  overflow: auto;
  padding: 1rem;
  border-left: 1px solid var(--line-color);
}

.markdown-viewer__toc .toc-header { margin-bottom: 0.7rem; font-weight: 600; }
.markdown-viewer__toc-link { display: block; padding: 0.22rem 0; color: var(--sec-text-color); line-height: 1.45; overflow-wrap: anywhere; }
.markdown-viewer__toc-link:hover { color: var(--viewer-accent); }
.markdown-viewer__toc-link.is-active { color: var(--viewer-accent); font-weight: 600; }
.markdown-viewer__toc-link.level-2 { padding-left: 0.75rem; }
.markdown-viewer__toc-link.level-3 { padding-left: 1.5rem; }
.markdown-viewer__toc-link.level-4,
.markdown-viewer__toc-link.level-5,
.markdown-viewer__toc-link.level-6 { padding-left: 2.25rem; }

.markdown-viewer .markdown-body { min-width: 0; }
.markdown-viewer .markdown-body h1,
.markdown-viewer .markdown-body h2,
.markdown-viewer .markdown-body h3,
.markdown-viewer .markdown-body h4,
.markdown-viewer .markdown-body h5,
.markdown-viewer .markdown-body h6 { scroll-margin-top: 5.5rem; }
.markdown-viewer .markdown-body table { display: block; max-width: 100%; overflow-x: auto; }
.markdown-viewer .markdown-body pre { position: relative; overflow-x: auto; }
.markdown-viewer .markdown-body img { max-width: 100%; height: auto; }
.markdown-viewer__image-placeholder { display: inline-block; padding: 0.45rem 0.7rem; border: 1px dashed var(--line-color); border-radius: 0.35rem; color: var(--sec-text-color); }
.markdown-viewer__task { width: 1rem; height: 1rem; margin: 0 0.35rem 0.15rem 0; vertical-align: middle; accent-color: var(--viewer-accent); }
.markdown-viewer__math { overflow-x: auto; overflow-y: hidden; }

.markdown-viewer__copy-code {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  z-index: 2;
  padding: 0.25rem 0.5rem;
  border: 1px solid rgba(127, 127, 127, 0.4);
  border-radius: 0.3rem;
  background: var(--board-bg-color);
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.78rem;
}

@media (max-width: 991.98px) {
  .markdown-viewer__reading { display: block; }
  .markdown-viewer__toc { position: static; display: none; }
  .markdown-viewer__controls { padding: 1.1rem; }
}

@media (max-width: 575.98px) {
  .markdown-viewer__dropzone { min-height: 6rem; flex-direction: column; text-align: center; }
  .markdown-viewer__drop-hint { display: none; }
  .markdown-viewer__toolbar { align-items: stretch; }
  .markdown-viewer__filename { flex-basis: 100%; margin-bottom: 0.2rem; }
  .markdown-viewer__button { flex: 1 1 auto; }
}

@supports not (color: color-mix(in srgb, black, white)) {
  .markdown-viewer__dropzone.is-dragging { background: transparent; }
}