/* Reading surface: a quiet continuation of the river scene. */
.article-reader {
  --reader-toolbar-height: 77px;
  position: fixed; inset: 0; width: min(1200px, calc(100% - 64px)); max-width: none;
  max-height: calc(100dvh - 48px); margin: auto; padding: 0;
  border: 1px solid var(--color-border); border-radius: 16px;
  background: var(--color-reading-bg); color: var(--color-text);
  box-shadow: 0 32px 120px rgba(0, 0, 0, .5); overflow: auto; overscroll-behavior: contain;
  scrollbar-width: thin; scrollbar-color: var(--color-border) transparent;
  scroll-padding-top: calc(var(--reader-toolbar-height) + 28px);
}
.article-reader::backdrop { background: rgba(3, 8, 6, .84); backdrop-filter: blur(10px); }
.reader-toolbar { position: sticky; top: 0; z-index: 3; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 32px; background: var(--color-reading-bg); border-bottom: 1px solid var(--color-line); }
.reader-brand { color: var(--color-accent); text-decoration: none; font: 500 1rem/1.5 var(--font-display); white-space: nowrap; }
.reader-tools { display: flex; align-items: center; gap: 8px; }
.reader-tools .quiet-button { background: transparent; }
#readingProgress { position: sticky; display: block; top: var(--reader-toolbar-height); z-index: 4; width: 100%; height: 2px; border: 0; appearance: none; background: transparent; }
#readingProgress::-webkit-progress-bar { background: var(--color-line); }
#readingProgress::-webkit-progress-value { background: var(--color-accent); }
#readingProgress::-moz-progress-bar { background: var(--color-accent); }
.reader-layout { display: grid; grid-template-columns: 184px minmax(0, 1fr); align-items: start; gap: 48px; padding: 48px 48px 80px; }
.reader-layout.without-toc { grid-template-columns: minmax(0, 1fr); }
.reader-content { min-width: 0; width: 100%; max-width: 44rem; margin: 0 auto; padding: 0; overflow-wrap: anywhere; }
.reader-heading { padding-bottom: 36px; margin-bottom: 40px; border-bottom: 1px solid var(--color-line); }
#readerTitle { margin: 0 0 24px; color: var(--color-text); font: 600 clamp(2.25rem, 3.5vw, 3rem)/1.4 var(--font-display); letter-spacing: .025em; text-wrap: balance; }
.reader-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; color: var(--color-muted); font-size: .8125rem; line-height: 1.8; }
.reader-category { color: var(--color-accent); font-weight: 600; }
.reader-abstract { margin: 24px 0 0; padding: 0; color: var(--color-reading-text); border: 0; font-size: 1rem; line-height: 1.9; }
.reader-abstract:empty, #readerStatus:empty { display: none; }
#readerStatus { color: var(--color-muted); font-size: .9375rem; line-height: 1.8; }
.reader-toc { position: sticky; top: calc(var(--reader-toolbar-height) + 32px); max-height: calc(100dvh - var(--reader-toolbar-height) - 140px); overflow-y: auto; scrollbar-width: thin; padding: 0 8px 8px 0; }
.reader-toc-label { margin: 0 0 16px; color: var(--color-text); font-size: .875rem; font-weight: 600; }
.reader-toc button { display: block; width: 100%; min-height: 44px; padding: 10px 10px 10px calc(12px + var(--toc-depth, 0) * 12px); border: 0; border-left: 2px solid var(--color-line); background: transparent; color: var(--color-muted); text-align: left; font: 400 .8125rem/1.65 var(--font-sans); overflow-wrap: anywhere; transition: background 160ms, color 160ms; }
.reader-toc button:hover { color: var(--color-text); background: var(--color-reading-highlight); }
.reader-toc button[aria-current] { color: var(--color-accent); border-left-color: var(--color-accent); background: var(--color-reading-highlight); font-weight: 600; }
.article-prose { color: var(--color-reading-text); font: 400 1.0625rem/1.95 var(--font-sans); }
.article-prose p { white-space: pre-wrap; margin: 0 0 1.45em; }
.article-prose :is(h2, h3, h4, h5, h6) { color: var(--color-text); font-weight: 650; line-height: 1.5; letter-spacing: .01em; margin: 2em 0 .8em; scroll-margin-top: 8px; text-wrap: pretty; }
.article-prose h2 { font-family: var(--font-display); font-size: 1.85em; font-weight: 600; padding-bottom: .45em; border-bottom: 1px solid var(--color-line); }
.article-prose h3 { font-family: var(--font-sans); font-size: 1.45em; }
.article-prose h4 { font-family: var(--font-sans); font-size: 1.2em; }
.article-prose h5, .article-prose h6 { font-family: var(--font-sans); font-size: 1.06em; }
.article-prose > :first-child { margin-top: 0; }
.article-prose strong { color: var(--color-text); font-weight: 700; }
.article-prose a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 5px; }
.article-prose a:hover { color: var(--color-focus); }
.article-prose ul, .article-prose ol { padding-left: 1.6em; margin: 0 0 1.5em; }
.article-prose li { margin-block: .5em; padding-left: .2em; }
.article-prose li::marker { color: var(--color-accent); }
.article-prose code { font-family: var(--font-mono); }
.article-prose :not(pre) > code { padding: .12em .4em; border: 1px solid var(--color-line); border-radius: 5px; color: var(--color-accent); background: var(--color-reading-highlight); font-size: .87em; box-decoration-break: clone; }
.article-prose pre { position: relative; max-width: 100%; margin: 28px 0; overflow-x: auto; padding: 64px 24px 24px; border: 1px solid var(--color-line); border-radius: 10px; background: var(--color-bg); color: var(--color-reading-text); font: .875rem/1.85 var(--font-mono); tab-size: 4; }
.article-prose pre code { font: inherit; }
.code-language { position: absolute; top: 20px; left: 24px; color: var(--color-muted); font: .75rem/1.5 var(--font-mono); }
.code-copy { position: absolute; top: 8px; right: 12px; font-family: var(--font-sans); border-color: transparent; background: transparent; }
.article-prose blockquote { margin: 28px 0; padding: 16px 24px; border-left: 3px solid var(--color-accent); border-radius: 0 8px 8px 0; background: var(--color-reading-highlight); color: var(--color-reading-text); }
.article-prose img { display: block; max-width: 100%; height: auto; margin: 32px auto; border: 1px solid var(--color-line); border-radius: 8px; }
.article-prose .image-unavailable { display: block; padding: 16px; border: 1px dashed var(--color-border); color: var(--color-muted); }
.article-table { max-width: 100%; overflow-x: auto; margin: 28px 0; border: 1px solid var(--color-line); border-radius: 8px; }
.article-table table { width: 100%; border-collapse: collapse; font-size: .9em; }
.article-table th, .article-table td { padding: 14px 18px; border-bottom: 1px solid var(--color-line); text-align: left; min-width: 100px; }
.article-table th { background: var(--color-reading-highlight); color: var(--color-text); font-weight: 600; }
.article-table tr:last-child td { border-bottom: 0; }
.article-prose hr { border: 0; border-top: 1px solid var(--color-line); margin: 40px 0; }
.large-type .article-prose { font-size: 1.25rem; }
@media (max-width: 1199px) {
  .reader-layout { grid-template-columns: 160px minmax(0, 1fr); gap: 32px; padding: 40px 32px 64px; }
}
@media (max-width: 767px) {
  .reader-layout { grid-template-columns: minmax(0, 1fr); padding: 32px 28px 64px; }
  .reader-toc { display: none; }
  .reader-toolbar { padding-inline: 24px; }
  #readerTitle { font-size: 2rem; }
}
@media (max-width: 639px) {
  .article-reader { width: 100%; height: 100dvh; max-height: 100dvh; border: 0; border-radius: 0; }
  .reader-toolbar { padding: 12px 16px; gap: 8px; flex-wrap: wrap; }
  .reader-brand { flex: 0 0 100%; font-size: .875rem; }
  .reader-tools { width: 100%; justify-content: space-between; }
  .reader-tools .quiet-button { padding-inline: 12px; }
  .reader-layout { padding: 32px 24px 64px; }
  #readerTitle { font-size: 1.875rem; margin-bottom: 20px; line-height: 1.5; }
  .reader-heading { padding-bottom: 28px; margin-bottom: 32px; }
  .reader-meta { gap: 6px 16px; font-size: .75rem; }
  .reader-abstract { font-size: .9375rem; }
  .article-prose { font-size: 1rem; }
  .article-prose h2 { font-size: 1.65em; }
  .article-prose h3 { font-size: 1.35em; }
  .article-prose h4 { font-size: 1.15em; }
  .article-prose pre { padding-inline: 16px; font-size: .8125rem; }
  .article-prose blockquote { padding: 16px 20px; }
}

/* Discussion follows the article's measure, without another floating layer. */
.reader-comments-link { border: 0; border-bottom: 1px solid currentColor; padding: 0; background: transparent; color: var(--color-accent); font: inherit; min-height: 32px; cursor: pointer; }
.article-comments { margin-top: 64px; padding-top: 40px; border-top: 1px solid var(--color-border); scroll-margin-top: 16px; }
.comments-heading, .comments-heading > div, .comment-submit-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.comments-heading { margin-bottom: 28px; }
.comments-heading h2 { margin: 0; color: var(--color-text); font: 600 1.75rem/1.5 var(--font-display); }
#commentCount { color: var(--color-muted); font-size: .875rem; }
.comment-form { margin-bottom: 36px; }
.comment-form label { font-size: 1rem; color: var(--color-text); font-weight: 500; }
#commentIdentity { margin: 8px 0 16px; }
.comment-form textarea { display: block; width: 100%; min-height: 132px; resize: vertical; border: 1px solid var(--color-border); border-radius: 10px; padding: 16px; background: var(--color-bg); color: var(--color-text); font: 1rem/1.85 var(--font-sans); }
.comment-form textarea::placeholder { color: var(--color-muted); }
.comment-form textarea[aria-invalid=true] { border-color: var(--color-error); }
.comment-submit-row { margin-top: 12px; }
#commentCounter { font-size: .8125rem; color: var(--color-muted); }
.comment-submit-row .primary-btn { padding: 10px 20px; font-size: .9375rem; }
.comment-action-status { color: var(--color-accent); font-size: .875rem; line-height: 1.8; margin: 12px 0 0; }
.comment-action-status:empty { display: none; }
.comment-reply-to { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--color-accent); font-size: .875rem; padding: 0 0 8px; }
.comment-list { list-style: none; padding: 0; margin: 20px 0 0; }
.comment-item { display: flex; align-items: start; gap: 16px; padding: 24px 0; border-bottom: 1px solid var(--color-line); }
.comment-item.is-reply { margin-left: 20px; padding-left: 16px; border-left: 2px solid var(--color-line); }
.comment-avatar { position: relative; flex: 0 0 36px; width: 36px; height: 36px; overflow: hidden; display: grid; place-items: center; border-radius: 50%; background: var(--color-reading-highlight); color: var(--color-accent); font-size: .875rem; }
.comment-avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.comment-main { flex: 1; min-width: 0; }
.comment-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; line-height: 1.8; font-size: .875rem; }
.comment-meta strong { color: var(--color-text); font-weight: 600; }
.comment-meta time, .comment-parent { color: var(--color-muted); font-size: .75rem; }
.comment-text { margin: 12px 0 4px; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--color-reading-text); font-size: 1rem; line-height: 1.9; }
.comment-actions { display: flex; gap: 16px; }
.comment-actions .text-button { min-height: 44px; font-size: .8125rem; }
.comment-actions .comment-delete { color: var(--color-muted); }
.comment-confirm { margin-top: 12px; padding: 16px; border: 1px solid var(--color-border); border-radius: 8px; }
.comment-confirm p { margin: 0 0 12px; font-size: .875rem; }
.comment-confirm button { margin-right: 8px; }
@media (max-width: 639px) {
  .article-comments { margin-top: 48px; padding-top: 32px; }
  .comment-item { gap: 12px; }
  .comment-item.is-reply { margin-left: 8px; padding-left: 12px; }
  .comment-meta time { flex-basis: 100%; }
  .comment-submit-row { flex-wrap: wrap; }
}