body {
    font-family: "Segoe UI", sans-serif;
    line-height: 1.6;
    margin: 0;
    width: 100%;
    height: 100%;
    /* padding: 0 20px; */
    padding: 0;
    /* background: #fff; */
    color: #222;
    background: transparent;
    overflow-x: hidden;
  }
  .main-content {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
  }
  .main-content-t {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  }
  .main-content-exp{
  max-width: 1400px;
  margin: 40px auto;
  padding: 0 20px;
  }
  h1, h2 {
    text-align: center;
  }
  
  .center {
    text-align: center;
  }
  
  .caption {
    font-style: italic;
    color: #555;
    margin-top: 10px;
  }
  
  section {
    margin: 60px 0;
  }
  
  footer.small {
    font-size: 0.8em;
    color: #888;
    margin-top: 80px;
  }
  .button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin: 30px 0;
  }
  
  .circle-button {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #333;
    color: white;
    text-decoration: none;
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 18px;
    transition: background 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  }
  
  .circle-button:hover {
    background-color: #555;
    transform: translateY(-1px);
  }
  .hero-header {
    text-align: center;
    padding: 60px 20px 40px;
    background: #f9f9f9;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
  }
  
  /* 更优雅字体 + 更大字号 */
  .project-title {
    font-size: 40px;
    font-family: "Georgia", "Charter", serif;
    margin-bottom: 10px;
    color: #222;
  }
  
  .project-subtitle {
    font-size: 20px;
    color: #555;
    font-weight: 400;
    margin-bottom: 30px;
  }
  
  /* 按钮更清新 */
  .circle-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background-color: #444;
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    border-radius: 999px;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.08);
  }
  
  .circle-button:hover {
    background-color: #666;
    transform: translateY(-2px);
  }
  
  /* 按钮容器保持一致 */
  .button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
  }
  .project-subtitle {
    font-size: 24px;  /* 🔼 提升副标题字号 */
    color: #555;
    font-weight: 400;
    margin-bottom: 30px;
  }
  
  .circle-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background-color: #f5e9d6; /* 淡金色 */
    color: #2c2c2c;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-radius: 999px;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  }
  
  .circle-button:hover {
    background-color: #e7d5ba; /* hover 时更深一点 */
    transform: translateY(-2px);
    box-shadow: 0 6px 10px rgba(0,0,0,0.08);
  }
  
  .circle-button .icon {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    vertical-align: middle;
    /* ❌ 不加 filter，让彩色图标正常显示 */
  }
  .circle-button.glass {
    background: rgba(255, 255, 255, 0.2);
    color: #222;
    border: 1px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  }
  
  .circle-button.glass:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(0,0,0,0.15);
  }
  .circle-button.gray {
    background-color: #f5f5f5;
    color: #333;
    box-shadow: 0 3px 6px rgba(0,0,0,0.06);
  }
  
  .circle-button.gray:hover {
    background-color: #e0e0e0;
    transform: translateY(-2px);
    box-shadow: 0 6px 10px rgba(0,0,0,0.1);
  }
  .circle-button.blue {
    background-color: #e1efff;
    color: #1b3556;
    box-shadow: 0 3px 6px rgba(27, 53, 86, 0.1);
  }
  
  .circle-button.blue:hover {
    background-color: #c9e4ff;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(27, 53, 86, 0.2);
  }
  .authors-section {
    text-align: center;
    margin: 40px 0;
    font-size: 16px;
    line-height: 1.8;
    color: #444;
  }
  
  .authors-list {
    margin-bottom: 10px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
  }
  
  .authors-list span,
  .authors-list a {
    margin-right: 6px;
  }
  
  .authors-list a {
    color: #1b3556;
    text-decoration: none;
  }
  
  .authors-list a:hover {
    text-decoration: underline;
  }
  
  .affiliations {
    font-size: 15px;
    color: #666;
  }
  .equal-contribution {
    font-size: 14px;
    color: #888;
    margin-bottom: 6px;
  }  
  .teaser-section {
    text-align: center;
    margin: 60px 0;
    padding: 0 20px;
  }
  
  .teaser-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: #333;
  }
  
  .teaser-image {
    max-width: 100%;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  }
  
  .teaser-caption {
    max-width: 1150px;
    margin: 16px auto 0;
    font-size: 16px;
    color: #555;
    font-style: italic;
    line-height: 1.6;
  }
  .summary-section {
    background-color: #f9f9fb;
    padding: 40px 30px;
    border-radius: 12px;
    margin: 60px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
  }
  
  .summary-title {
    font-size: 22px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
    color: #333;
  }
  
  .summary-text {
    font-size: 16px;
    color: #444;
    line-height: 1.7;
    max-width: 850px;
    margin: 0 auto 20px;
    text-align: justify;
  }
  .Video-section {
    margin: 60px auto;
    padding: 0 20px;
    text-align: center;
  }

  .method-section {
    margin: 60px auto;
    padding: 0 20px;
    text-align: center;
  }
  
  .video-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
  }
  
  .dataset-intro {
    font-size: 16px;
    color: #444;
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.7;
  }
  
  .dataset-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
  }
  
  .dataset-card {
    background-color: #f7f7f9;
    border-radius: 12px;
    padding: 20px 24px;
    max-width: 320px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    text-align: left;
  }
  
  .dataset-card h3 {
    font-size: 18px;
    color: #222;
    margin-bottom: 14px;
  }
  
  .dataset-card ul {
    padding-left: 20px;
    font-size: 15px;
    color: #555;
    line-height: 1.6;
  }
  .dataset-distribution {
    background-color: #f6f6f6;
    padding: 30px 20px;
    border-radius: 16px;
    max-width: 850px;
    margin: 60px auto;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
  }
  .dataset-subtitle {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 16px;
  }
  
  .dataset-distribution-img {
    max-width: 480px;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    margin-bottom: 12px;
  }
  
  .dataset-distribution-caption {
    max-width: 800px;
    margin: 14px auto 0;
    font-size: 15px;
    color: #555;
    font-style: italic;
    line-height: 1.6;
  }
  .dataset-distribution-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    align-items: center;
    margin: 10px auto;
    max-width: 1000px;
    padding: 20px;
    border-radius: 12px;
    background-color: #fffefe;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  }

  .dataset-distribution-row-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    align-items: center;
    margin: 10px auto;
    max-width: 1000px;
    padding: 20px;
    border-radius: 12px;
    background-color: #fffefe;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    margin-top: -30px;
  }
  
  .dataset-distribution-row .dist-img img {
    max-width: 400px;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  }
  
  .dataset-distribution-row .dist-caption {
    flex: 1;
    min-width: 280px;
  }
  
  .dataset-distribution-row .dist-caption h3 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 12px;
  }
  
  .dataset-distribution-row .dist-caption p {
    font-size: 15px;
    color: #555;
    line-height: 1.6;
    font-style: italic;
  }

  .dataset-distribution-row-top .dist-img img {
    max-width: 400px;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  }
  
  .dataset-distribution-row-top .dist-caption {
    flex: 1;
    min-width: 280px;
  }
  
  .dataset-distribution-row-top .dist-caption h3 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 12px;
  }
  
  .dataset-distribution-row-top .dist-caption p {
    font-size: 15px;
    color: #555;
    line-height: 1.6;
    font-style: italic;
  }

  .task-vis-section h3 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-top: 15px;
  }
  
  .task-vis-section p {
    font-size: 15px;
    color: #555;
    line-height: 1.6;
    font-style: italic;
  }

  .task-vis-section {
    text-align: center;
    margin: 5px auto;
    padding: 0 20px;
  }
  
  .task-vis-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 24px;
    color: #333;
  }
  
  .task-vis-img {
    max-width: 100%;
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.06);
  }
  
  .task-vis-caption {
    max-width: 860px;
    margin: 16px auto 0;
    font-size: 15px;
    color: #555;
    font-style: italic;
    line-height: 1.6;
  }
  .benchmark-section {
    margin: 60px auto;
    padding: 0 20px;
    text-align: center;
  }
  
  .benchmark-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
  }
  
  .benchmark-intro {
    font-size: 16px;
    color: #444;
    max-width: 850px;
    margin: 0 auto 12px;
    line-height: 1.7;
    text-align: justify;
  }
  
  .benchmark-table-wrapper {
    margin-top: 30px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .benchmark-table {
    width: 100%;
    font-size: 15px;
    border-collapse: collapse;
    border-radius: 8px;
    overflow: hidden;
    text-align: center;
  }
  
  .benchmark-table thead {
    background-color: #f0f0f0;
  }
  
  .benchmark-table th,
  .benchmark-table td {
    padding: 10px 14px;
    border-bottom: 1px solid #e0e0e0;
    text-align: center;
  }
  
  .tag {
    margin-right: 6px;
  }
  
  .tag.api {
    color: #0070f3;
  }
  
  .tag.open {
    color: #f2a900;
  }
  
  .tag.finetune {
    color: #e74c3c;
  }
  
  .tag.human {
    color: #2ecc71;
  }
  
  .tag.baseline {
    color: #888;
  }
/* Section Layout */
.benchmark-section {
  margin: 60px auto;
  padding: 0 20px;
  text-align: center;
}

.benchmark-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
}

.benchmark-intro {
  font-size: 16px;
  color: #444;
  max-width: 860px;
  margin: 0 auto 10px;
  text-align: justify;
  line-height: 1.6;
}

.benchmark-table-wrapper {
  margin-top: 30px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

/* Table Styling */
.benchmark-table {
  width: 100%;
  font-size: 15px;
  border-collapse: collapse;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.benchmark-table thead {
  background-color: #f0f0f0;
}

.benchmark-table th,
.benchmark-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #e0e0e0;
  text-align: center;
}

/* Tag styling */
.tag {
  font-size: 13px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 8px;
  color: white;
  display: inline-block;
}

.benchmark-table-wrapper {
  margin-top: 30px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.benchmark-table {
  width: 100%;
  font-size: 15px;
  border-collapse: collapse;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.benchmark-table thead {
  background-color: #f0f0f0;
}

.benchmark-table th,
.benchmark-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #e0e0e0;
  text-align: center;
}

/* 分组标题行样式 */
.benchmark-table .group-label td {
  background-color: #f8f8f8;
  font-weight: 600;
  font-size: 14px;
  color: #444;
  padding: 12px 14px;
  border-top: 2px solid #ccc;
  text-align: left;
}
.benchmark-note {
  font-size: 14px;
  color: #444;
  max-width: 850px;
  margin: 28px auto 0;
  line-height: 1.6;
  background-color: #f9f9f9;
  padding: 18px 20px;
  border-radius: 10px;
  border-left: 4px solid #ccc;
}

.benchmark-note code {
  font-family: monospace;
  background: #eee;
  padding: 2px 5px;
  border-radius: 4px;
}

.benchmark-note ul {
  margin-top: 6px;
  padding-left: 20px;
}
.benchmark-note {
  font-size: 14px;
  color: #444;
  line-height: 1.6;
  max-width: 740px;
  margin: 28px auto 0;
  text-align: left;
  background-color: #fdfdfd;
  padding: 16px 20px;
  border-radius: 10px;
  border-left: 4px solid #ccc;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}

.benchmark-note code {
  font-family: monospace;
  background: #eee;
  padding: 2px 5px;
  border-radius: 4px;
}

.benchmark-note ul {
  margin: 8px 0 0 0;
  padding-left: 20px;
}
.dataset-construction {
  max-width: 860px;
  margin: 60px auto;
  padding: 0 20px;
}

.section-title {
  text-align: center;
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 25px;
}

.construction-image img {
  width: 100%;
  max-width: 960px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  margin-bottom: 8px;
}

.caption {
  font-size: 14px;
  font-style: italic;
  text-align: center;
  color: #666;
  margin-bottom: 30px;
}

.construction-steps {
  font-size: 15px;
  line-height: 1.7;
  color: #333;
  text-align: left;
}

.construction-steps ol {
  padding-left: 20px;
}

.construction-steps li {
  margin-bottom: 16px;
}
.grounding-module {
  max-width: 860px;
  margin: 60px auto;
  padding: 0 20px;
}

.construction-image img {
  width: 100%;
  max-width: 900px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  margin-bottom: 8px;
}

.caption {
  font-size: 14px;
  font-style: italic;
  text-align: center;
  color: #666;
  margin-bottom: 30px;
}

.construction-steps {
  font-size: 15px;
  line-height: 1.7;
  color: #333;
  text-align: left;
}

.construction-steps ol {
  padding-left: 20px;
}

.construction-steps li {
  margin-bottom: 16px;
}
.scrollable-table {
  overflow-x: auto;
  margin-top: 20px;
  border-radius: 10px;
}

.generalization-table {
  border-collapse: collapse;
  min-width: 900px;
  width: 100%;
  font-size: 14px;
  text-align: center;
}

.generalization-table thead {
  background: #f5f5f5;
  font-weight: 600;
}

.generalization-table th,
.generalization-table td {
  padding: 10px 14px;
  border: 1px solid #e0e0e0;
}

.generalization-table td:first-child {
  text-align: left;
}

.generalization-table .divider td {
  height: 10px;
  background: transparent;
  border: none;
}
.generalization-table .group-divider td {
  border-top: 2px solid #ccc;
  height: 8px;
  background: #fafafa;
}
.group-divider td {
  border-top: 2px solid #ccc;
  background: #f9f9f9;
  height: 10px;
}
.comparison-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-top: 10px;
  margin-left: 40px;
}

.comparison-card {
  background: #fafafa;
  border-radius: 12px;
  padding: 15px 15px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.05);
  max-width: 630px;
  flex: 1 1 380px;
}

.comparison-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.small-caption {
  font-size: 13px;
  color: #666;
  margin-bottom: 10px;
}

.small-table {
  width: 100%;
  font-size: 14px;
  border-collapse: collapse;
}

.small-table th,
.small-table td {
  border: 1px solid #ddd;
  padding: 8px 10px;
  text-align: center;
}

.small-table td:first-child {
  text-align: left;
}

.small-table .dim {
  color: #888;
  font-size: 13px;
}
.citation-section {
  margin-top: 60px;
  padding: 20px;
  background-color: #fdfdfd;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.citation-section pre {
  background: #f6f6f6;
  padding: 15px;
  overflow-x: auto;
  font-size: 14px;
  border-left: 4px solid #ccc;
  border-radius: 6px;
  line-height: 1.5;
}
.floating-toc {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #cdeeee;
  color: black;
  padding: 10px 14px;
  font-size: 14px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  z-index: 1000;
  transition: background 0.3s ease;
}

.floating-toc:hover {
  background: #b1e0e0;
}

.toc-popup {
  display: none;
  position: fixed;
  bottom: 70px;
  right: 24px;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  padding: 12px 16px;
  z-index: 1001;
}

.toc-popup a {
  display: block;
  text-decoration: none;
  color: #333;
  padding: 6px 0;
  font-size: 14px;
}

.toc-popup a:hover {
  color: #007acc;
}

.filter-panel {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin: 20px 0;
}

.filter-panel select {
  padding: 6px 12px;
  font-size: 14px;
  border-radius: 6px;
}

.task-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.task-card {
  background: #f9f9f9;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
  padding: 15px;
  max-width: 320px;
  width: 100%;
  text-align: left;
}

.task-card img {
  width: 100%;
  border-radius: 6px;
  margin-bottom: 12px;
}

.format-tag {
  display: inline-block;
  font-size: 12px;
  background: #e3e3e3;
  padding: 2px 8px;
  border-radius: 5px;
  color: #444;
  margin-top: 8px;
}
.task-meta {
  margin: 10px 0 12px 0;
  font-size: 13px;
  color: #444;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.task-name {
  font-weight: bold;
  color: #007acc;
  flex-basis: 100%;
}

.meta-tag {
  background: #f0f0f0;
  padding: 2px 8px;
  border-radius: 5px;
}
.carousel-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  margin-top: 20px;
}

.carousel-track {
  display: flex;
  overflow-x: auto;
  scroll-behavior: smooth;
  gap: 20px;
  padding: 10px 0;
  margin: 0 40px;
}


.task-card {
  flex: 0 0 280px;
  background: #f9f9f9;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
  padding: 15px;
  text-align: left;
}

.carousel-btn {
  background-color: rgba(255, 255, 255, 0.85);
  border: none;
  border-radius: 50%;
  width: 42px;
  height: 42px;
  font-size: 20px;
  font-weight: bold;
  color: #444;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  transition: all 0.2s ease;
  z-index: 10;
}

.carousel-btn:hover {
  background-color: #f2f2f2;
  transform: scale(1.1);
}

.carousel-btn.left {
  margin-left: -50px;
}

.carousel-btn.right {
  margin-right: -50px;
}
.task-images {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 12px;
}

.task-img {
  width: 100%;
  max-width: 260px;
  border-radius: 6px;
  flex-shrink: 0;
}
.question-block {
  position: relative;
  overflow: hidden;
}

.question-text {
  max-height: 18em; /* 约 3 行 */
  overflow: hidden;
  transition: max-height 0.3s ease;
  font-size: 15px;
  line-height: 1.4;
  color: #333;
}
.answer-text {
  font-size: 13.5px;
  color: #555;
  line-height: 1.5;
  margin-top: 8px;
}
.question-text.expanded {
  max-height: 1000px;
}

.expand-btn {
  background: none;
  border: none;
  color: #007acc;
  cursor: pointer;
  font-size: 13px;
  padding: 4px 0;
  text-align: left;
}
.question-text.collapsed {
  max-height: 10em;  /* 约4行 */
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.question-text.expanded {
  max-height: 1000px;
}
.task-card {
  position: relative;
  padding-bottom: 40px; /* 给底部留出空间放 answer */
}

.answer-label {
  font-weight: 600;
  margin-right: 4px;
}
.answer-float {
  position: absolute;
  bottom: 10px;
  left: 14px;
  right: 14px;
  font-size: 13px;
  color: #333;
  background: #f8f8f8;
  border-radius: 6px;
  padding: 6px 10px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  font-family: monospace;
  white-space: normal;
  overflow-wrap: break-word;
  transition: opacity 0.2s ease;
  opacity: 1;
}

.answer-float.hidden {
  display: none;
}

.answer-toggle {
  position: absolute;
  bottom: 10px;
  left: 14px;
}

.answer-toggle button {
  font-size: 12px;
  background: #e0e0e0;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  transition: background 0.2s ease;
}
.answer-toggle button:hover {
  background: #ccc;
}
.section-subtitle {
  text-align: center;
  max-width: 800px;
  margin: 10px auto 40px;
  font-size: 16px;
  color: #555;
  line-height: 1.6;
}



/* 🔍 悬浮时完全展开 */
.answer-float:hover {
  white-space: normal;           /* ✅ 允许换行 */
  overflow: visible;             /* ✅ 不裁剪 */
  text-overflow: unset;          /* ✅ 不显示省略号 */
  max-width: 300px;              /* ✅ 宽度限制防止撑满整个页面 */
  text-align: left;
  z-index: 10;
}
/* ✅ HERO SECTION */
.hero-header {
  background: linear-gradient(to bottom, #ffffff, #f3f4f6);
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.6), rgba(243, 244, 246, 0.8));
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 20px;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  display: inline-block;
  margin: 0 auto;
}

/* ✅ TEXT & BUTTON STYLES */
.project-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #222;
}

.project-subtitle {
  font-size: 20px;
  color: #555;
  margin-bottom: 30px;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.circle-button {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  background-color: #007bff;
  color: white;
  font-weight: 600;
  border-radius: 25px;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.circle-button:hover {
  background-color: #0056b3;
}

.icon {
  width: 20px;
  height: 20px;
  margin-right: 8px;
}
.hero-content {
  background: linear-gradient(to bottom, #ffffff, #f9fafb); /* 更柔和的白 */
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);  /* 减弱阴影 */
  padding: 64px 32px;
  border-radius: 20px;
}
.project-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  color: #1a1a1a;
}
.circle-button {
  padding: 10px 20px;
  background: #e5f0ff;
  color: #003f8a;
  border-radius: 999px;
  font-weight: 500;
  box-shadow: 0 3px 6px rgba(0,0,0,0.06);
  backdrop-filter: blur(6px);
  transition: all 0.2s ease-in-out;
}
.circle-button:hover {
  background: #d2e8ff;
  transform: translateY(-1px);
}
@media (max-width: 600px) {
  .project-title {
    font-size: 32px;
  }
  .project-subtitle {
    font-size: 16px;
  }
  .circle-button {
    font-size: 14px;
    padding: 8px 16px;
  }
}
.bg-geometry {
  position: absolute;
  top: 10%;
  left: 5%;
  width: 160px;
  opacity: 0.08;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  background: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 20px;
  padding: 64px 32px;
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.04),
    0 8px 24px rgba(0, 0, 0, 0.08);
  max-width: 760px;
  text-align: center;
}
.hero-header {
  background: radial-gradient(circle at top right, #e8f4ff 10%, #f5f7fa 60%, #ffffff 100%);
  position: relative;
  height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* .hero-header::after {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  top: -80px;
  right: -80px;
  background: radial-gradient(circle, rgba(173,216,255,0.3), transparent 70%);
  z-index: 0;
} */

/* .hero-header::before {
  content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  bottom: -100px;
  left: -100px;
  background: radial-gradient(circle, rgba(220,240,255,0.2), transparent 70%);
  z-index: 0;
} */
@media (max-width: 600px) {
  .project-title {
    font-size: 32px;
  }
  .project-subtitle {
    font-size: 16px;
  }
  .circle-button {
    padding: 8px 16px;
    font-size: 14px;
  }
}


/* 让 header 占满视口并居中内容 */
.hero-header {
  width: 100vw;
  min-height: 100vh;
  background: radial-gradient(circle at center, #e0f0ff 0%, #f9fbfd 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 60px 20px;
  box-sizing: border-box;
  overflow: hidden;
}

/* 保持居中盒子宽度限制，不影响你原来的 section */
.hero-content {
  max-width: 880px;
  width: 100%;
  padding: 50px 30px;
  background: white;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
  box-sizing: border-box;
}
.hero-header {
  min-height: 100dvh; /* ✅ 在有些设备上比 100vh 更准确 */
}

.hero-header {
  width: 100vw;
  height: 100vh;
  padding: 60px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, #e0f0ff 0%, #f9fbfd 100%);
  box-sizing: border-box;
  overflow: hidden; /* 防止溢出 */
  margin: 0 auto;
}


.hero-content {
  max-width: 800px;
  width: 100%;
  padding: 40px;
  background: white;
  border-radius: 16px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
  text-align: center;
  box-sizing: border-box;
}





.hero-content {
  background: none;
  backdrop-filter: none;
  box-shadow: none;
  padding: 0;
  border-radius: 0;
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
  border: none;
}
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
  margin-top: 20px;  /* 再加一点顶部间距 */
  margin-bottom: 1px;
}
.circle-button.green {
  background: rgba(255, 255, 255, 0.5); /* 半透明白 */
  color: #333;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: 999px;
  
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  /* box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05); */
  /* backdrop-filter: blur(4px); */
  transition: all 0.25s ease;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.circle-button.green:hover {
  background: rgba(255, 255, 255, 0.75);
  /* box-shadow: 0 8px 22px rgba(0, 0, 0, 0.08); */
  transform: translateY(-2px);
}


.icon {
  width: 26px !important;
  height: 26px !important;
  margin-right: 10px;
  flex-shrink: 0;
}
@media (max-width: 600px) {
  .project-title {
    font-size: 40px;
  }
  .project-subtitle {
    font-size: 18px;
  }
}
@media (max-width: 600px) {
  .circle-button {
    font-size: 15px;
    padding: 8px 18px;
  }
}
.project-subtitle {
  font-size: 30px;
  font-weight: 400;
  color: #555;
  margin-bottom: 20px;
  margin-top: 10px; 
}

.project-title {
  font-size: 50px;        /* 原来是 48px，提升视觉权重 */
  font-weight: 800;
  letter-spacing: -0.5px; /* 更加紧凑现代 */
  margin-bottom: 0px;
  margin-top: 1px; 
}

.top-logo-bar {
  position: absolute;
  top: 20px;
  left: 40px;
  font-size: 1rem;
  color: #444;
  font-weight: 500;
  font-family: 'Segoe UI', sans-serif;
  opacity: 0.7;
  z-index: 10;
}

.authors-list {
  font-size: 16px;
  line-height: 1.6;
  max-width: 960px;
  margin: 0 auto 8px auto;
  text-align: center;
  color: #222;
  font-weight: 500;
}
.equal-contribution {
  font-size: 14px;
  color: #666;
  font-style: italic;
  margin-bottom: 4px;
}
.affiliations {
  font-size: 14.5px;
  color: #555;
  margin-bottom: 10px;
  font-style: italic;
}
.authors-list {
  text-align: center;
  margin: 0 auto 24px auto;
  max-width: 960px;
  font-size: 17px;
  line-height: 1.75;
  color: #222;
}

.authors-list sup {
  font-size: 0.65em;
}

.equal-contribution {
  font-size: 14.5px;
  font-style: italic;
  color: #777;
  margin-top: 6px;
  margin-bottom: 2px;
}

.affiliations {
  font-size: 15px;
  margin-top: 4px;
}

.affiliations .inst {
  display: inline-block;
  background: rgba(255,255,255,0.3);
  border-radius: 12px;
  padding: 3px 10px;
  margin: 0 6px;
  font-style: italic;
  color: #444;
  transition: all 0.3s ease;
}

.affiliations .inst:hover {
  background: rgba(255,255,255,0.5);
  color: #111;
}



.hero-header {
  width: 102vw;
  height: 52vh;
  min-height: 50vh;
  display: flex;
  left: -1vw; 
  top: -1vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e3f2fd, #d1c4e9, #ffe0b2); /* 淡蓝 → 紫 → 柔橘 */
  /* background-size: 400% 400%; */
  background-size: 110% 110%;
  background-position: center center;
  background-repeat: no-repeat;
  animation: gradientShift 15s ease infinite;
  /* padding: 20px; */
  /* padding: 0;  */
  padding: 60px 20px;
  margin: 0;
  position: relative;
  box-sizing: border-box;
  overflow: hidden;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero-content {
  position: relative;
  z-index: 2;
  /* background: rgba(255, 255, 255, 0.6); */
  border-radius: 20px;
  padding: 40px 40px;
  /* box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1); */
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
  /* box-shadow: none; */

}
.title-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 40px;
}


.spar-logo strong {
  font-weight: 900;
  color: #040303;  /* 可选：更深颜色以突出 */
}
.author-names {
  font-weight: normal;
}

.title-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;               /* 图像与标题之间的间距，推荐比原来稍大一点 */
  margin-top: 10px;        /* 可调节整体距离顶部的距离 */
  margin-bottom: 3px;     /* 底部留白 */
}
.title-deco-img {
  display: block;
  width: 80vw;
  max-width: 550px;
  height: auto;
  opacity: 0.95;
  margin-top: 1px;           /* 让图片本身往下挪 */
  z-index: 1;
  pointer-events: none;
  margin-bottom: 10px;
}
.top-logo-bar {
  position: absolute;
  top: 20px;
  left: 32px;
  font-size: 1.1rem;
  font-weight: 500;
  font-family: 'Segoe UI', sans-serif;
  color: #333;
  opacity: 0.75;
  z-index: 10;
  white-space: nowrap;
}

/* ✅ 小屏幕下自动缩小字体、允许换行 */
@media (max-width: 600px) {
  .top-logo-bar {
    font-size: 0.9rem;
    left: 16px;
    top: 12px;
    white-space: normal;
    line-height: 1.3;
    max-width: 80vw;
  }
}
.hero-header {
  width: 102vw;
  height: 52vh;
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #c8e1ff, #d1c4e9, #ffd180);
  background-size: 400% 400%;
  background-position: center center;
  animation: gradientShift 15s ease infinite;
  padding: 60px 20px;
  margin: 0;
  position: relative;
  box-sizing: border-box;
  overflow: hidden;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}


.video-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* 让 video 铺满容器并裁切 */
.video-box video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}


.three-column-layout {
  display: flex;
  align-items: stretch;
  justify-content: center;
  align-items: flex-start;
  gap: 40px;
  /* margin-top: 40px; */
  /* font-family: serif; */
}

.three-column-layout .column {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  min-height: 600px;
}

.three-column-layout .reference-image {
  width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;     /* ✅ 垂直居中 */
  /* border: 2px solid #ccc; */
}

.three-column-layout .mesh-box {
  width: 250px;
  height: 250px;
  background-color: #f9f9f9;
  border: 1px solid #ccc;
  margin-right: -20px;
  margin-left: -45px;
}

.three-column-layout .caption-box {
  border: 2px solid black;
  width: 200px;
  height: 250px;
  padding: 8px;
  border-radius: 12px;
  font-size: 15px;
  text-align: left;
  background-color: white;
  position: relative;
  margin-left: -25px;
}

.three-column-layout .section-title {
  font-weight: bold;
  font-size: 20px;
  margin-bottom: -15px;
  margin-left: -25px;
}

.three-column-layout .section-title-reference {
  font-weight: bold;
  font-size: 20px;
  margin-bottom: -15px;
}


.section-seed {
margin-top: -40px;
margin-bottom: -10px;
}

.four-part-layout_comp {
  max-width: 860px;
  margin: 40px auto;
  font-family: serif;
}

.grid_comp {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px 30px;
  margin-top: 70px;
  margin-bottom: 70px;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.grid-item_comp {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.title_comp {
  font-weight: bold;
  font-size: 18px;
  margin-bottom: 8px;
}

.image-box_comp {
  /* width: 100%; */
  max-width: 250px;
  height: 250px;
  border: 1px solid #ccc;
}

.mesh-box-comp {
  width: 350px;
  height: 250px;
  background-color: #f9f9f9;
  border: 1px solid #ccc;
}

.caption-box_comp {
  border: 2px solid black;
  border-radius: 12px;
  padding: 16px;
  font-size: 15px;
  line-height: 1.5;
  max-width: 250px;
  max-height: 200px;
  background-color: white;
  text-align: left;
}

.model-name_comp {
  margin-top: 6px;
  font-weight: bold;
  font-size: 16px;
}

.spatial_understanding{
  margin-bottom: -50px;
}

.qa_section {
  max-width: 800px;
  margin: 0 auto;
  font-family: 'Segoe UI', sans-serif;
  line-height: 1.5;
  
}

.image_grid_qa {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 20px;
  width: 600px;
  height: 150px;
}

.image_grid_qa img {
  width: 100%;
  max-width: 32%;
  border-radius: 5px;
  object-fit: cover;
  border: 1px solid #ccc;
  display: block;
  margin: 0 auto;
}

.single_image_grid_qa {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 20px;
  width: 600px;
  height: 200px;
}

.single_image_grid_qa img {
  width: 100%;
  max-width: 50%;
  border-radius: 5px;
  object-fit: cover;
  border: 1px solid #ccc;
  display: block;
  margin: 0 auto;
}

.text_block_qa {
  background-color: #fefefe;
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #ddd;
}

.question_qa,
.answer_qa {
  margin-bottom: 10px;
}

.red_qa {
  color: red;
  font-weight: 500;
}

.blue_qa {
  color: #1e90ff;
  font-weight: 500;
}
.qa_wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
}
/* 外层包裹容器，整个组件居中 */
.qa_wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
}

.video_grid_qa {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 20px;
  width: 600px;
  height: 200px;
}

.video_grid_qa video {
  width: 100%;
  max-width: 50%;
  border-radius: 5px;
  object-fit: cover;
  border: 1px solid #ccc;
  display: block;
  margin: 0 auto;
}


.scroll-wrapper {
      overflow-x: auto;
      overflow-y: hidden;
      white-space: nowrap;
      padding: 40px;
}

.carousel-container {
  display: flex;
  gap: 20px;
  flex-wrap: nowrap;
}

.item {
  flex: 0 0 auto;
  width: 300px;
  border: 1px solid #ccc;
  border-radius: 12px;
  background: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

/* .reference-image-wrapper {
  height: 180px;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 3px solid #787676;
}

.reference-image {
  max-height: 160px;
  max-width: 90%;
  object-fit: contain;
} */

.render-container {
  height: 250px;
  width: 100%;
  position: relative;
}

.render_div {
  width: 100%;
  height: 100%;
}

.reference-block {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  height: 180px;
  width: 100%;
  border-bottom: 3px solid #787676;
  padding: 6px;
  box-sizing: border-box;
}

.reference-image {
  max-height: 150px;
  max-width: 50%;
  object-fit: contain;
  border-radius: 6px;
}

.reference-caption {
  max-width: 48%;
  font-size: 12px;
  color: #064972;
  line-height: 1.4;
  background: #f5f5f5;
  padding: 8px 6px;
  border-radius: 8px;
  box-shadow: inset 0 1px 3px rgba(225, 232, 237, 0.05)
}