:root {
  --xtu-dark-blue: #003d82;
  --xtu-light-blue: #7ba3c9;
  --xtu-accent: #1a5fb4;
  --xtu-border: #dbe6f3;
  --xtu-paper: #f5f8fd;
  --xtu-ink: #102f52;
  --xtu-copper: #c69343;
  /* 代码块配置，可通过修改此变量调整字体大小 */
  --code-font-size: 0.7em;
  --code-bg: #282c34;
  --code-color: #abb2bf;
  /* 表格配置，可通过修改此变量调整字体大小 */
  --table-font-size: 0.85em;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

html {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #0f1826;
}

html.xtu-html-home {
  display: block;
  overflow: auto;
  background: #f5f5f5;
}

body.xtu-site {
  /* 学术汇报正文：英文衬线+中文思源宋体，正式易读 */
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
  color: #173b63;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

body.xtu-site:not(.xtu-index-page) {
  width: var(--xtu-slide-design-width, 1280px);
  height: var(--xtu-slide-design-height, 720px);
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(var(--xtu-preview-scale, 1));
  transform-origin: center center;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.24);
  background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
}

body.xtu-site.xtu-index-page {
  width: 100vw;
  height: 100dvh;
  aspect-ratio: auto;
  overflow: auto;
  box-shadow: none;
  background: #f5f5f5;
  color: #1d1e20;
}

.xtu-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  padding: 28px 56px 10px;
}

.xtu-title-wrap {
  flex: 1;
}

.xtu-page-title {
  margin: 0;
  /* 学术标题：加粗衬线字体，庄重正式 */
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  font-weight: 700;
  font-size: var(--xtu-slide-title-font-px, 84.48px);
  line-height: 1.2;
  color: var(--xtu-dark-blue);
  letter-spacing: 0.01em;
}

.xtu-title-underline {
  width: 100%;
  height: 6px;
  margin-top: 16px;
  border-radius: 0 4px 4px 0;
  background: linear-gradient(90deg, var(--xtu-dark-blue) 0%, var(--xtu-light-blue) 68%, rgba(123, 163, 201, 0.2) 100%);
}

.xtu-brand {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.xtu-logo {
  width: 84px;
  height: 84px;
}

.xtu-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.xtu-brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.xtu-brand-cn {
  display: block;
  height: 38px;
  width: auto;
  max-width: none;
  aspect-ratio: 167 / 47;
  object-fit: contain;
}

.xtu-brand-en {
  color: var(--xtu-light-blue);
  font-size: 1.2rem;
  font-weight: 600;
  font-style: italic;
}

.xtu-main {
  position: relative;
  flex: 1;
  padding: 8px 56px 68px;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.xtu-card {
  border: 1px solid var(--xtu-border);
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0, 61, 130, 0.08);
}

.xtu-slide-card {
  flex: 1;
  height: auto;
  padding: 22px;
  overflow: hidden;
  position: relative;
}

.xtu-md-root {
  transform-origin: top left;
  will-change: transform;
  line-height: 1.78;
  font-size: var(--xtu-slide-body-font-px, 35.2px);
}

.xtu-md-root h1 {
  display: none;
}

.xtu-md-root h2,
 .xtu-md-root h3,
 .xtu-md-root h4,
 .xtu-md-root h5,
 .xtu-md-root h6 {
  color: var(--xtu-dark-blue);
  margin: 10px 0;
  line-height: 1.35;
}

.xtu-md-root h2 {
  font-size: var(--xtu-slide-h2-font-px, 54px);
}

.xtu-md-root h3 {
  font-size: var(--xtu-slide-h3-font-px, 49px);
}

.xtu-md-root h4 {
  font-size: var(--xtu-slide-h4-font-px, 44px);
}

.xtu-md-root h5 {
  font-size: var(--xtu-slide-h5-font-px, 40px);
}

.xtu-md-root h6 {
  font-size: var(--xtu-slide-h6-font-px, 37px);
}

.xtu-md-root p {
  margin: 10px 0;
}

.xtu-md-root ul,
.xtu-md-root ol {
  margin: 10px 0 10px 1.25rem;
}

.xtu-md-root img {
  display: block;
  max-width: min(100%, 1080px);
  max-height: 500px;
  margin: 10px auto;
  border: none;
  border-radius: 8px;
  object-fit: contain;
  cursor: zoom-in;
}

/* 默认宽度82%，但允许通过内联style覆盖 */
.xtu-md-root img:not([style*="width"]) {
  width: 82%;
}

.xtu-md-root a {
  pointer-events: none;
}

/* 代码块样式 */
.xtu-md-root pre {
  background: var(--code-bg);
  color: var(--code-color);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 12px 0;
  line-height: 1.5;
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
  font-size: var(--code-font-size);
}

.xtu-md-root code {
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
  font-size: 0.85em;
  background: rgba(0, 61, 130, 0.06);
  color: var(--xtu-dark-blue);
  padding: 2px 6px;
  border-radius: 4px;
}

.xtu-md-root pre code {
  background: transparent;
  color: var(--code-color);
  padding: 0;
  border-radius: 0;
  font-size: 1em;
}

.xtu-figure {
  margin: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
  page-break-inside: avoid;
  break-inside: avoid;
}

.xtu-figure-standalone {
  width: min(82%, 1080px);
  margin: 12px auto;
}

.xtu-figcaption {
  display: block;
  text-align: center;
  font-size: var(--xtu-slide-caption-font-px, 18px);
  color: #4a6f9b;
  line-height: 1.4;
}

.xtu-media-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 10px 0 12px;
  align-items: start;
}

.xtu-media-row.is-two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.xtu-media-item {
  display: flex;
  align-items: center;
  justify-content: center;
}

.xtu-media-item .xtu-figure {
  width: auto;
  max-width: 100%;
  align-items: center;
}

.xtu-media-item img {
  width: auto;
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
  margin: 0;
}

.xtu-slide-card.is-image-heavy .xtu-figure-standalone {
  width: min(92%, 1380px);
  margin: 8px auto;
}

.xtu-slide-card.is-image-heavy .xtu-md-root img {
  width: 100%;
  max-width: 100%;
  max-height: 660px;
}

.xtu-slide-card.is-image-heavy .xtu-media-row {
  margin: 6px 0 8px;
  gap: 8px;
}

.xtu-slide-card.is-image-heavy .xtu-media-item img {
  max-height: 560px;
}

.xtu-slide-card.is-image-heavy .xtu-figcaption {
  font-size: var(--xtu-slide-caption-font-px, 18px);
  line-height: 1.3;
}

.xtu-lightbox-open {
  overflow: hidden;
}

.xtu-lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 36px 48px 72px;
  background: rgba(8, 17, 31, 0.78);
  backdrop-filter: blur(2px);
}

.xtu-lightbox.is-open {
  display: flex;
}

.xtu-lightbox-dialog {
  position: relative;
  width: min(92vw, 1500px);
  max-height: calc(100dvh - 96px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.xtu-lightbox-image {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: calc(100dvh - 180px);
  border-radius: 12px;
  object-fit: contain;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
  background: #fff;
}

.xtu-lightbox-caption {
  max-width: min(88vw, 1200px);
  color: #eef5ff;
  text-align: center;
  font-size: var(--xtu-slide-caption-font-px, 18px);
  line-height: 1.4;
}

.xtu-lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  z-index: 1;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  font-size: 1.9rem;
  line-height: 1;
  cursor: pointer;
}

.xtu-lightbox-close:hover {
  background: rgba(255, 255, 255, 0.24);
}

.xtu-md-root table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--xtu-border);
  margin: 10px 0;
  /* 表格字体和正文统一为衬线字体 */
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  font-size: var(--table-font-size);
}

.xtu-md-root th,
.xtu-md-root td {
  border: 1px solid var(--xtu-border);
  padding: 11px 13px;
  text-align: left;
}

.xtu-md-root th {
  background: #edf3fb;
}

.xtu-hotspot {
  position: absolute;
  top: 8px;
  bottom: 68px;
  width: 50%;
  z-index: 4;
}

.xtu-hotspot-left {
  left: 56px;
}

.xtu-hotspot-right {
  right: 56px;
}

.xtu-hotspot.is-disabled {
  pointer-events: none;
}

.xtu-footer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  height: 50px;
  display: flex;
  align-items: center;
  background: #fff;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.06);
}

.xtu-nav-sections {
  flex: 1;
  height: 100%;
  display: flex;
}

.xtu-nav-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #fff;
  font-size: var(--xtu-slide-nav-title-font-px, 18.3px);
  font-weight: 600;
  letter-spacing: 0.5px;
  white-space: nowrap;
  background: var(--xtu-light-blue);
  transition: background 0.2s ease;
}

.xtu-nav-item:hover {
  background: var(--xtu-accent);
}

.xtu-nav-item.is-active {
  background: var(--xtu-dark-blue);
}

.xtu-page-number {
  width: 60px;
  text-align: center;
  color: var(--xtu-dark-blue);
  font-style: italic;
  font-weight: 600;
}

.xtu-overview-card {
  padding: 20px 22px;
  margin-bottom: 14px;
}

.xtu-overview-card h2 {
  margin: 0 0 8px;
  color: var(--xtu-dark-blue);
}

.xtu-overview-card p {
  margin: 0;
}

.xtu-section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  flex: 1;
  overflow: auto;
  padding-right: 4px;
}

.xtu-section-card {
  padding: 16px;
}

.xtu-section-card h3 {
  margin: 0 0 10px;
  color: var(--xtu-dark-blue);
}

.xtu-section-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.xtu-section-card li + li {
  margin-top: 8px;
}

.xtu-section-card a {
  color: #1b4778;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.xtu-section-card a:hover {
  color: var(--xtu-accent);
}

.xtu-item-index {
  color: var(--xtu-dark-blue);
  font-weight: 700;
}

.xtu-pm-main {
  width: min(100%, 860px);
  margin: 0 auto;
  padding: 28px 16px 42px;
}

.xtu-pm-home-info {
  margin-bottom: 18px;
}

.xtu-pm-title {
  margin: 0;
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: #1d1e20;
}

.xtu-pm-subtitle {
  margin: 8px 0 0;
  color: #5f6368;
  line-height: 1.6;
  font-size: 0.96rem;
}

.xtu-pm-stats {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.xtu-pm-stats span {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid #e3e5e8;
  background: #ffffff;
  color: #5f6368;
  font-size: 0.8rem;
}

.xtu-pm-list {
  display: grid;
  gap: 14px;
}

.xtu-pm-entry,
.xtu-pm-empty {
  padding: 16px 18px;
  border: 1px solid #e8e8e8;
  border-radius: 10px;
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.xtu-pm-entry {
  display: block;
  text-decoration: none;
  color: inherit;
  animation: xtu-pm-entry-in 0.24s ease-out both;
  animation-delay: var(--entry-delay, 0ms);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.xtu-pm-entry:hover {
  border-color: #d7d9dc;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.xtu-pm-entry-title {
  margin: 0;
  font-size: 1.18rem;
  line-height: 1.3;
  color: #1d1e20;
}

.xtu-pm-entry:hover .xtu-pm-entry-title {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.xtu-pm-entry-summary {
  margin: 10px 0 0;
  color: #4e5358;
  font-size: 0.93rem;
  line-height: 1.62;
}

.xtu-pm-entry-meta {
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: #6b7279;
  font-size: 0.79rem;
}

@keyframes xtu-pm-entry-in {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.xtu-hub-main {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 26px 32px 28px;
  background:
    radial-gradient(circle at 9% 15%, rgba(11, 62, 109, 0.15), transparent 37%),
    radial-gradient(circle at 90% 80%, rgba(198, 147, 67, 0.14), transparent 44%),
    linear-gradient(150deg, #f8fbff 0%, #edf3fa 56%, #e7eff8 100%);
}

.xtu-hub-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.xtu-orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(0.2px);
  opacity: 0.54;
  animation: xtu-orb-float 9s ease-in-out infinite;
}

.xtu-orb-a {
  width: 360px;
  height: 360px;
  top: -130px;
  right: -90px;
  background: radial-gradient(circle at 28% 26%, rgba(25, 96, 159, 0.46), rgba(16, 74, 132, 0.03));
}

.xtu-orb-b {
  width: 250px;
  height: 250px;
  bottom: -88px;
  left: -72px;
  background: radial-gradient(circle at 32% 32%, rgba(209, 152, 60, 0.3), rgba(209, 152, 60, 0.01));
  animation-delay: 1.4s;
}

.xtu-orb-c {
  width: 220px;
  height: 220px;
  top: 49%;
  left: 39%;
  background: radial-gradient(circle at 36% 36%, rgba(65, 132, 193, 0.2), rgba(65, 132, 193, 0.01));
  animation-delay: 2.2s;
}

.xtu-grid-noise {
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image:
    linear-gradient(rgba(16, 58, 96, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 58, 96, 0.07) 1px, transparent 1px);
  background-size: 36px 36px;
}

.xtu-hub-hero {
  position: relative;
  margin-bottom: 16px;
  padding: 22px 24px;
  border: 1px solid rgba(128, 170, 209, 0.55);
  background:
    linear-gradient(162deg, rgba(255, 255, 255, 0.95), rgba(245, 250, 255, 0.94)),
    linear-gradient(20deg, rgba(245, 218, 170, 0.22), rgba(245, 218, 170, 0));
  animation: xtu-card-rise 0.48s cubic-bezier(0.2, 0.78, 0.32, 1) both;
  z-index: 1;
}

.xtu-hub-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(240px, 0.9fr);
  gap: 16px;
  align-items: stretch;
}

.xtu-hub-lead {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.xtu-hub-kicker {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #2b5885;
  font-size: 0.7rem;
  font-weight: 700;
}

.xtu-hub-title {
  margin: 8px 0 0;
  /* Hub大标题：统一学术衬线字体 */
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  font-weight: 700;
  font-size: clamp(2.5rem, 4.8vw, 3.95rem);
  line-height: 0.94;
  letter-spacing: 0.012em;
  color: #0d3760;
  text-wrap: balance;
}

.xtu-hub-subtitle {
  margin: 12px 0 0;
  color: #365c84;
  font-size: 0.97rem;
  max-width: 70ch;
  line-height: 1.55;
}

.xtu-hub-rule {
  width: clamp(120px, 24vw, 220px);
  height: 4px;
  margin-top: 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(13, 56, 96, 0.96), rgba(110, 157, 201, 0.66) 70%, rgba(110, 157, 201, 0.07));
}

.xtu-hub-cta {
  margin-top: auto;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 14px;
}

.xtu-hub-sidepanel {
  border: 1px solid rgba(146, 180, 214, 0.55);
  border-radius: 12px;
  padding: 12px 13px 14px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.78), rgba(239, 247, 255, 0.7));
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: xtu-card-rise 0.5s cubic-bezier(0.2, 0.78, 0.32, 1) both;
  animation-delay: 90ms;
}

.xtu-hub-side-title {
  margin: 0;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  font-size: 0.68rem;
  color: #4f7598;
  font-weight: 700;
}

.xtu-hub-stats {
  margin: 0;
  display: grid;
  gap: 8px;
}

.xtu-hub-stat {
  border: 1px solid rgba(153, 186, 217, 0.53);
  border-radius: 10px;
  padding: 9px 10px;
  background: rgba(249, 252, 255, 0.82);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.xtu-hub-stat-num {
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  font-size: 1.62rem;
  font-weight: 700;
  line-height: 0.9;
  color: #1b4b77;
}

.xtu-hub-stat-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: #5a82a7;
}

.xtu-hub-note {
  margin: 0;
  line-height: 1.45;
  font-size: 0.78rem;
  color: #4f7092;
}

.xtu-featured {
  position: relative;
  margin-bottom: 16px;
  padding: 18px 20px 16px;
  border: 1px solid rgba(145, 184, 218, 0.68);
  background:
    linear-gradient(160deg, rgba(250, 253, 255, 0.96), rgba(236, 246, 255, 0.92)),
    linear-gradient(0deg, rgba(242, 205, 138, 0.2), rgba(242, 205, 138, 0));
  animation: xtu-card-rise 0.54s cubic-bezier(0.2, 0.78, 0.32, 1) both;
  animation-delay: var(--card-delay, 0ms);
}

.xtu-featured-kicker {
  margin: 0;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.17em;
  color: #5c7fa0;
  font-weight: 700;
}

.xtu-featured-title {
  margin: 6px 0 0;
  font-family: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  font-size: clamp(1.95rem, 2.8vw, 2.6rem);
  line-height: 0.98;
  color: #0d3760;
  max-width: 90%;
  text-wrap: balance;
}

.xtu-featured-summary {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.6;
  color: #355a7d;
  max-width: 78ch;
}

.xtu-featured-meta {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.xtu-featured-chip {
  margin: 0;
  border: 1px solid rgba(157, 189, 218, 0.7);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.84);
  color: #2a5a86;
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.xtu-featured-chip strong {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b8dae;
}

.xtu-featured-actions {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.xtu-deck-mosaic {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 12px;
  position: relative;
  z-index: 1;
}

.xtu-mosaic-card {
  position: relative;
  grid-column: span 4;
  padding: 14px 16px 14px;
  border: 1px solid rgba(159, 192, 220, 0.66);
  background: linear-gradient(157deg, rgba(255, 255, 255, 0.93), rgba(237, 246, 255, 0.89));
  display: flex;
  flex-direction: column;
  min-height: 206px;
  animation: xtu-card-rise 0.56s cubic-bezier(0.2, 0.78, 0.32, 1) both;
  animation-delay: var(--card-delay, 0ms);
}

.xtu-mosaic-card:nth-child(3n + 1) {
  grid-column: span 5;
}

.xtu-mosaic-card:nth-child(3n + 2) {
  grid-column: span 4;
}

.xtu-mosaic-card:nth-child(3n) {
  grid-column: span 3;
}

.xtu-mosaic-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.xtu-mosaic-index {
  margin: 0;
  font-family: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 0.9;
  color: rgba(20, 73, 118, 0.6);
}

.xtu-mosaic-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.64rem;
  color: #6f92b4;
}

.xtu-mosaic-title {
  margin: 0;
  margin-top: 4px;
  font-size: 1.24rem;
  line-height: 1.24;
  font-family: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  color: var(--xtu-ink);
  text-wrap: balance;
}

.xtu-mosaic-summary {
  margin: 9px 0 0;
  color: #3b6084;
  line-height: 1.5;
  font-size: 0.83rem;
}

.xtu-mosaic-meta-wrap {
  margin-top: 10px;
  display: grid;
  gap: 6px;
}

.xtu-mosaic-meta {
  margin: 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  font-size: 0.76rem;
  color: #2f5d89;
}

.xtu-mosaic-meta strong {
  color: #7093b4;
  letter-spacing: 0.05em;
  font-size: 0.63rem;
  text-transform: uppercase;
}

.xtu-mosaic-actions {
  margin-top: auto;
  padding-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.xtu-mosaic-empty {
  grid-column: 1 / -1;
  margin: 0;
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.94rem;
  color: #4f7397;
  border: 1px dashed rgba(138, 175, 210, 0.75);
  background: rgba(250, 253, 255, 0.76);
}

.xtu-deck-link {
  border: 1px solid #adc9e2;
  color: #174a7b;
  background: #edf5ff;
  text-decoration: none;
  border-radius: 999px;
  padding: 8px 13px;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.xtu-deck-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 7px 14px rgba(29, 82, 128, 0.18);
  border-color: #89b1d2;
}

.xtu-deck-link-primary {
  background: linear-gradient(135deg, #0e4b7f, #166eb1);
  border-color: #0e4b7f;
  color: #fff;
}

@keyframes xtu-card-rise {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.988);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes xtu-orb-float {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  45% {
    transform: translate3d(0, -11px, 0);
  }
  75% {
    transform: translate3d(0, -4px, 0);
  }
}

@media (max-width: 900px) {
  .xtu-pm-main {
    padding: 16px 12px 26px;
  }

  .xtu-pm-title {
    font-size: clamp(1.6rem, 7.4vw, 2rem);
  }

  .xtu-pm-entry,
  .xtu-pm-empty {
    padding: 14px;
    border-radius: 9px;
  }

  .xtu-pm-entry-meta {
    flex-direction: column;
    gap: 4px;
  }

  .xtu-hub-main {
    padding: 14px 12px 16px;
  }

  .xtu-hub-hero {
    padding: 16px 14px;
  }

  .xtu-hub-hero-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .xtu-hub-title {
    font-size: clamp(2.05rem, 9vw, 2.55rem);
  }

  .xtu-hub-sidepanel {
    padding: 10px 11px 11px;
  }

  .xtu-featured {
    padding: 15px 14px 14px;
  }

  .xtu-featured-title {
    max-width: 100%;
    font-size: clamp(1.72rem, 7.2vw, 2.18rem);
  }

  .xtu-featured-summary {
    font-size: 0.87rem;
  }

  .xtu-featured-chip {
    width: 100%;
    justify-content: space-between;
  }

  .xtu-deck-mosaic {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .xtu-mosaic-card,
  .xtu-mosaic-card:nth-child(3n + 1),
  .xtu-mosaic-card:nth-child(3n + 2),
  .xtu-mosaic-card:nth-child(3n) {
    grid-column: auto;
    min-height: 0;
  }
}


.xtu-cover-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 20px;
  cursor: pointer;
}

.xtu-cover-title {
  margin: 0;
  /* 封面标题：加粗衬线字体，正式大气 */
  font-family: 'Libre Baskerville', 'Noto Serif SC', 'Times New Roman', SimSun, serif;
  font-weight: 700;
  font-size: var(--xtu-slide-cover-title-font-px, 65.47px);
  line-height: 1.15;
  color: var(--xtu-dark-blue);
  letter-spacing: 0.01em;
}

.xtu-cover-meta {
  margin-top: 22px;
  font-size: var(--xtu-slide-cover-meta-font-px, 21.47px);
  font-weight: 500;
  color: #365f8f;
}