/* Independent transmission reading page, relation channel, and article echoes. */
.article-page-main {
  width: min(1220px, calc(100% - 48px));
}

/* 页头返回：与品牌标记同一套切角仪器框，文字沿用导航字距。 */
.article-parent-link {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--ink-dim);
  font: 500 13px/1 var(--font-display, var(--font-sans));
  letter-spacing: .18em;
  text-decoration: none;
  transition: color .3s;
}

.article-parent-mark {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  clip-path: var(--notch);
  transition: color .3s, border-color .3s, background-color .3s;
}

.article-parent-mark svg {
  display: block;
  transition: transform .4s var(--ease-out, ease-out);
}

.article-parent-label {
  position: relative;
  padding: 6px 0;
}

.article-parent-label::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: calc(100% - .18em);
  height: 1px;
  background: var(--signal-text);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .4s var(--ease-out, ease-out);
}

.article-parent-link:hover,
.article-parent-link:focus-visible {
  color: var(--ink);
}

.article-parent-link:hover .article-parent-mark,
.article-parent-link:focus-visible .article-parent-mark {
  color: var(--signal-text);
  border-color: color-mix(in srgb, var(--signal-text) 60%, var(--line-strong));
  background: var(--signal-soft);
}

.article-parent-link:hover .article-parent-mark svg,
.article-parent-link:focus-visible .article-parent-mark svg {
  transform: translateX(-2px);
}

.article-parent-link:hover .article-parent-label::after,
.article-parent-link:focus-visible .article-parent-label::after {
  transform: scaleX(1);
  transform-origin: left;
}

.article-parent-link:focus-visible {
  outline: 1px solid var(--signal-text);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .article-parent-link,
  .article-parent-mark,
  .article-parent-mark svg,
  .article-parent-label::after {
    transition: none;
  }
}

.article-page-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 42%);
  align-items: end;
  gap: 72px;
  min-height: 540px;
  padding: 20px 0 56px;
  border-bottom: 1px solid var(--line-strong);
}

.article-page-hero > div:first-child {
  min-width: 0;
}

.article-page-hero h1 {
  max-width: 15ch;
  margin: 14px 0 18px;
  color: var(--ink);
  font-family: var(--font-title);
  font-size: 62px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

.article-page-hero > div > p {
  max-width: 760px;
  margin: 0 0 20px;
  color: var(--ink-dim);
  font-size: 16px;
  line-height: 1.85;
}

.article-page-cover {
  display: grid;
  min-width: 0;
  max-height: 520px;
  aspect-ratio: 16 / 9;
  place-items: center;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius, 6px);
}

html[data-theme="light"] .article-page-cover {
  background: #090c12;
  border-color: rgba(20, 28, 38, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.article-page-cover:empty {
  display: none;
}

.article-page-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.article-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--platform-cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0;
}

.article-page-meta span,
.article-page-meta time {
  overflow-wrap: anywhere;
}

.article-page-layout {
  display: grid;
  grid-template-columns: 180px minmax(0, 760px);
  justify-content: center;
  gap: 72px;
  padding-top: 64px;
}

.article-page-layout > div {
  min-width: 0;
}

.article-page-rail {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  align-self: start;
  max-height: calc(100vh - var(--header-h) - 56px);
  overflow-y: auto;
  padding-left: 14px;
  border-left: 1px solid var(--line-strong);
}

.article-page-rail:empty {
  display: none;
}

.article-page-rail a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  margin-bottom: 12px;
  color: var(--ink-dim);
  font-size: 12px;
  line-height: 1.55;
  text-decoration: none;
}

.article-page-rail a span {
  color: var(--platform-cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
}

.article-page-rail a:hover,
.article-page-rail a:focus-visible {
  color: var(--ink);
}

/* 桌面侧栏的目录始终展开，摘要行只在窄屏出现。 */
.article-rail-toc > summary {
  display: none;
}

.article-prose {
  color: color-mix(in srgb, var(--ink) 92%, transparent);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.95;
  /* 更严格的行首禁则；支持的浏览器（Safari）让句读悬挂在行尾，右缘更齐。 */
  line-break: strict;
  hanging-punctuation: allow-end;
}

.article-prose > :first-child {
  margin-top: 0;
}

.article-prose p {
  margin: 0 0 1.35em;
}

.article-prose h2 {
  scroll-margin-top: calc(var(--header-h) + 30px);
  margin: 64px 0 20px;
  padding-bottom: 12px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-title);
  font-size: 30px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
}

.article-prose h3 {
  margin: 42px 0 16px;
  color: var(--ink);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
}

.article-prose img,
.article-prose video {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 28px auto;
}

.article-prose a {
  color: var(--platform-cyan);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentColor 42%, transparent);
  text-underline-offset: 4px;
}

.article-prose blockquote {
  margin: 32px 0;
  padding: 14px 0 14px 22px;
  color: var(--ink);
  border-left: 2px solid var(--platform-accent);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.85;
}

.article-prose code,
.article-prose pre {
  font-family: var(--font-mono);
}

.article-prose code {
  padding: 2px 5px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-size: .88em;
}

.article-prose pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 18px;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.75;
}

.article-prose pre code {
  padding: 0;
  background: transparent;
  border: 0;
}

.article-prose ul,
.article-prose ol {
  margin: 0 0 1.5em;
  padding-left: 1.5em;
}

.article-prose li {
  margin-bottom: .55em;
}

.article-prose li::marker {
  color: var(--platform-cyan);
}

.article-prose details {
  margin: 28px 0;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.article-prose summary {
  color: var(--ink);
  cursor: pointer;
}

.article-prose table {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 28px 0;
  overflow-x: auto;
  border-collapse: collapse;
}

.article-prose th,
.article-prose td {
  min-width: 120px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-prose th {
  color: var(--ink);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
}

.article-entity-relations {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line-strong);
}

.article-entity-relations > h2 {
  margin: 8px 0 20px;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
}

.entity-relation-link {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding: 12px 0;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.entity-relation-link small {
  color: var(--platform-cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0;
}

.entity-relation-link strong {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.entity-relation-link > span {
  color: var(--signal-text);
}

.article-echoes {
  margin-top: 72px;
  padding-top: 32px;
  border-top: 1px solid var(--line-strong);
}

.article-echoes > h2 {
  margin: 8px 0 24px;
  color: var(--ink);
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
}

.article-echo-form {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.article-echo-identity {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.article-echo-form input,
.article-echo-form textarea {
  width: 100%;
  min-width: 0;
  padding: 11px 12px;
  color: var(--ink);
  background: color-mix(in srgb, var(--panel) 74%, transparent);
  border: 1px solid var(--line);
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0;
  resize: vertical;
}

.article-echo-form input:focus,
.article-echo-form textarea:focus {
  outline: 1px solid var(--signal-text);
  outline-offset: 2px;
  border-color: var(--signal-text);
}

.article-echo-target {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0;
}

.article-echo-target[hidden] {
  display: none;
}

.article-echo-target strong {
  color: var(--ice);
}

.article-echo-target button,
.echo-reply-button {
  padding: 0;
  color: var(--signal-text);
  background: transparent;
  border: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0;
  cursor: pointer;
}

.article-echo-target button {
  margin-left: auto;
  color: var(--ink-dim);
}

.article-echo-form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 36px;
}

.article-echo-form-actions > p {
  margin: 0;
  color: var(--ink-dim);
  font-size: 11px;
  line-height: 1.5;
}

.article-echo-buttons {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-left: auto;
}

.article-echo-buttons > button[type="submit"] {
  min-height: 36px;
  padding: 0 14px;
  color: var(--signal-text);
  background: transparent;
  border: 1px solid var(--signal-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0;
  cursor: pointer;
}

.article-echo-buttons > button:disabled {
  opacity: .45;
  cursor: wait;
}

#articleEchoList {
  border-top: 1px solid var(--line);
}

.article-echo {
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--line);
}

.article-echo > header,
.article-echo-reply > header {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.article-echo header strong,
.article-echo-reply header strong {
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
}

.article-echo header time,
.article-echo-reply header time {
  margin-left: auto;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1;
  letter-spacing: 0;
}

.article-echo-code {
  color: var(--signal-text);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0;
}

.article-echo > p,
.article-echo-reply > p {
  margin: 8px 0 9px;
  color: var(--ink-dim);
  font-size: 13px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.article-echo-replies {
  display: grid;
  gap: 0;
  margin-top: 12px;
  padding-left: 16px;
  border-left: 1px solid var(--line-strong);
}

.article-echo-reply {
  padding: 11px 0 9px;
  border-top: 1px dotted var(--line);
}

.article-echo-reply header span {
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.3;
  letter-spacing: 0;
}

.article-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  margin-top: 14px;
}

.article-pagination button {
  width: 34px;
  height: 34px;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0;
  cursor: pointer;
}

.article-pagination button[aria-current="page"] {
  color: var(--bg);
  background: var(--signal-text);
  border-color: var(--signal-text);
}

.article-pagination button:disabled {
  opacity: .28;
  cursor: default;
}

@media (max-width: 960px) {
  .article-page-hero {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 40%);
    gap: 40px;
    min-height: 480px;
  }

  .article-page-hero h1 {
    font-size: 50px;
  }

  .article-page-layout {
    grid-template-columns: 150px minmax(0, 700px);
    gap: 40px;
  }
}

@media (max-width: 760px) {
  .article-page-main {
    width: calc(100% - 32px);
  }

  .article-page-hero {
    grid-template-columns: 1fr;
    gap: 28px;
    min-height: 0;
    padding: 0 0 40px;
  }

  .article-page-hero h1 {
    font-size: 40px;
  }

  .article-page-cover {
    max-height: none;
  }

  .article-page-layout {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 40px;
  }

  .article-page-rail {
    position: static;
    max-height: none;
    overflow: visible;
    padding: 0;
    border-bottom: 1px solid var(--line);
    border-left: 0;
  }

  /* 窄屏目录收成一条仪表读数：「目录 · N 节」，展开后是带细分隔线的章节列表。 */
  .article-rail-toc > summary {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 48px;
    color: var(--ink);
    font-size: 14px;
    cursor: pointer;
    list-style: none;
  }

  .article-rail-toc > summary::-webkit-details-marker {
    display: none;
  }

  .article-rail-toc > summary small {
    color: var(--platform-cyan);
    font-family: var(--font-mono);
    font-size: var(--fs-micro);
  }

  .article-rail-toc > summary::after {
    content: "";
    width: 7px;
    height: 7px;
    margin: 0 4px 0 auto;
    border-right: 1px solid var(--ink-dim);
    border-bottom: 1px solid var(--ink-dim);
    transform: translateY(-2px) rotate(45deg);
  }

  .article-rail-toc[open] > summary::after {
    transform: translateY(2px) rotate(-135deg);
  }

  .article-rail-toc > summary:focus-visible {
    outline-offset: -2px;
  }

  .article-rail-toc-links {
    padding-bottom: 6px;
  }

  .article-page-rail a {
    min-width: 0;
    max-width: none;
    margin: 0;
    padding: 11px 0;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 620px) {
  .article-page-hero h1 {
    font-size: 34px;
  }

  .article-prose {
    font-size: 16px;
    line-height: 1.9;
  }

  .article-prose h2 {
    margin-top: 52px;
    font-size: 25px;
  }

  .entity-relation-link {
    grid-template-columns: 1fr auto;
    gap: 5px 12px;
  }

  .entity-relation-link small {
    grid-column: 1 / -1;
  }

  .article-echoes {
    margin-top: 52px;
    padding-top: 24px;
  }

  .article-echo-identity {
    grid-template-columns: 1fr;
  }

  .article-echo-form-actions {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-echo-buttons {
    width: 100%;
    margin-left: 0;
  }

  .article-echo-buttons > button[type="submit"] {
    flex: 1;
  }

  .article-echo-replies {
    padding-left: 12px;
  }

  .article-echo > header,
  .article-echo-reply > header {
    flex-wrap: wrap;
  }
}

/* Rich Visual Longform Elements */
.article-callout {
  position: relative;
  margin: 32px 0;
  padding: 20px 24px;
  background: color-mix(in srgb, var(--panel) 75%, transparent);
  border: 1px solid color-mix(in srgb, var(--line) 36%, transparent);
  border-left: 3px solid var(--platform-accent, #d6ff73);
  border-radius: var(--radius, 6px);
  backdrop-filter: blur(12px);
}

.article-callout p:last-child {
  margin-bottom: 0;
}

.article-callout-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--platform-accent, #d6ff73);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

html[data-theme="light"] .article-callout {
  background: rgba(248, 247, 242, 0.95);
  border-color: rgba(20, 28, 38, 0.12);
  border-left-color: #3b5314;
}

html[data-theme="light"] .article-callout-title {
  color: #3b5314;
}

.article-metric-table {
  width: 100%;
  margin: 32px 0;
  border-collapse: collapse;
  font-size: 14px;
  font-family: var(--font-sans);
  background: color-mix(in srgb, var(--panel) 60%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius, 6px);
  overflow: hidden;
}

.article-metric-table th,
.article-metric-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 25%, transparent);
}

.article-metric-table th {
  background: color-mix(in srgb, var(--panel) 85%, transparent);
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.article-metric-table tr:last-child td {
  border-bottom: 0;
}

.article-metric-table code {
  color: var(--platform-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
}

@media print {
  /* 无论屏幕上是哪种主题，纸面都按浅色墨水印：深色主题的近白文字和浅青链接在白纸上几乎看不见。 */
  :root,
  html[data-theme] {
    color-scheme: light;
    --bg: #fff;
    --panel: #fff;
    --panel-2: #f4f2ec;
    --ink: #1d232a;
    --ink-dim: #4d5560;
    --ink-faint: #565e6b;
    --line: rgba(29, 35, 42, .15);
    --line-strong: rgba(29, 35, 42, .32);
    --signal: #4f6a17;
    --signal-text: #384e0e;
    --alert: #c23524;
    --ice: #186f9e;
    --amber: #875a0d;
  }

  .skip-link,
  .article-page-rail,
  .article-echoes {
    display: none !important;
  }

  .article-prose p {
    orphans: 2;
    widows: 2;
  }

  .article-prose :is(h2, h3) {
    break-after: avoid;
  }

  .article-prose :is(figure, img, pre, blockquote),
  .article-prose .semantic-block {
    break-inside: avoid;
  }

  .article-page-hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .article-page-layout {
    display: block;
    padding-top: 24px;
  }

  .article-prose {
    color: #111;
    font-size: 11pt;
  }
}
/* Authentic Pure Subject Illustrations */
.article-pure-figure {
  margin: 2.2rem 0;
  text-align: center;
}

.article-pure-figure img {
  display: block;
  max-width: 100%;
  max-height: 420px;
  width: auto;
  margin: 0 auto;
  object-fit: contain;
  filter: drop-shadow(0 12px 32px rgba(0, 0, 0, 0.65));
  transition: transform 0.3s ease;
}

.article-pure-figure img:hover {
  transform: scale(1.02);
}

.article-pure-figure figcaption,
.article-pure-figure-duo figcaption,
.figure-caption-summary {
  margin-top: 0.85rem;
  color: var(--ink-dim);
  font: 500 0.8rem/1.6 var(--font-sans);
  font-variant-numeric: tabular-nums;
  text-align: center;
  letter-spacing: 0.02em;
}

.article-pure-figure-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2.2rem 0 0.5rem;
  align-items: center;
}

@media (max-width: 640px) {
  .article-pure-figure-duo {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.article-pure-figure-duo figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--ink) 3%, transparent);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.2rem;
}

.article-pure-figure-duo img {
  max-height: 180px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.6));
  transition: transform 0.3s ease;
}

.article-pure-figure-duo img:hover {
  transform: scale(1.06);
}

.article-pure-figure-duo figcaption {
  margin-top: 0.65rem;
  font-size: 0.76rem;
  color: var(--ink-dim);
}

/* Quad 4-in-a-row Pure Subject Figure (Katowice 2014) */
.article-pure-figure-quad {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 2rem 0 0.5rem;
  align-items: stretch;
}

.article-pure-figure-quad figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.5rem;
  background: radial-gradient(circle at center, color-mix(in srgb, var(--ink) 5%, transparent) 0%, color-mix(in srgb, var(--panel) 60%, transparent) 80%);
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-pure-figure-quad figure:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--amber) 40%, transparent);
}

.article-pure-figure-quad img {
  width: 100%;
  max-width: 110px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.5));
}

.article-pure-figure-quad figcaption {
  margin-top: auto;
  color: var(--ink);
  font: 600 0.75rem/1.35 var(--font-sans);
  font-variant-numeric: tabular-nums;
  text-align: center;
  text-wrap: balance;
  /* 只在空格处换行，避免把「全息」这类词拆到两行。 */
  word-break: keep-all;
  overflow-wrap: anywhere;
}

@media (max-width: 680px) {
  .article-pure-figure-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .article-pure-figure-quad figure {
    padding: 0.65rem 0.35rem;
  }

  .article-pure-figure-quad figcaption {
    font-size: 0.70rem;
  }
}

/* 纸面上黑色投影会发灰发脏，浅色主题改用淡墨色投影。 */
html[data-theme="light"] .article-pure-figure img { filter: drop-shadow(0 12px 28px rgba(20, 28, 38, 0.18)); }
html[data-theme="light"] .article-pure-figure-duo img { filter: drop-shadow(0 8px 20px rgba(20, 28, 38, 0.16)); }
html[data-theme="light"] .article-pure-figure-quad img { filter: drop-shadow(0 4px 10px rgba(20, 28, 38, 0.16)); }