:root {
  --tah-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Global Navigation */

/* Local Navigation */

/* Project switcher dropdown */

/* Dropdown menu */

/* Mobile Menu Toggle */

/* Animation keyframes */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Scroll reveal animations */

/* Hero Section */

.hero-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--apple-blue);
  border: 1px solid var(--apple-blue);
  padding: 16px 32px;
  border-radius: 980px;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: all 0.3s ease;
}

.hero-badge-long {
  max-width: 480px;
}

.hero-title span {
  background: var(--tah-gradient);
  padding-right: 0.05em;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-value {
  font-size: 56px;
  font-weight: 600;
  letter-spacing: -0.03em;
  background: var(--tah-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-actions,
.hero-badges {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-badges {
  gap: 12px;
}

/* Section Styles */

/* Centered section header */
.section-header-centered {
  text-align: center;
}

.section-header-centered .section-subtitle {
  margin: 0 auto;
}

.text-highlight-gradient {
  background: var(--tah-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Authors Section */

.affiliations {
  margin-top: 24px;
  font-size: 14px;
  color: var(--apple-gray);
  line-height: 1.8;
}

/* Problem Section */

/* Overview Section */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: center;
  margin-top: 48px;
}

.overview-content {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.overview-lead {
  font-size: 19px;
  line-height: 1.6;
  color: #444;
}

.overview-points {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.overview-point {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.overview-point-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.overview-point-icon.problem {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.overview-point-icon.solution {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
}

.overview-point-text {
  font-size: 16px;
  line-height: 1.5;
  color: #444;
}

.overview-point-text strong {
  color: var(--apple-black);
}

.overview-figure {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.08);
}

.overview-figure img {
  width: 100%;
  height: auto;
  display: block;
}

/* Motivation Section */
.motivation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.motivation-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
  transition: all 0.3s ease;
}

.motivation-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.08);
}

.motivation-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.motivation-icon i {
  font-size: 24px;
  color: #fff;
}

.motivation-card h4 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

.motivation-card p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--apple-gray);
}

.example-comparison {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
  text-align: center;
}

.example-comparison img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.example-caption {
  margin-top: 20px;
  font-size: 14px;
  color: var(--apple-gray);
  line-height: 1.5;
}

.problem-box {
  background: #fff;
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  min-width: 200px;
  flex: 1;
  max-width: 280px;
}

.problem-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
}

/* Insight Cards */

.insight-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 32px;
  transition: all 0.3s ease;
}

.insight-percentage {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.insight-label {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

/* Method Figure */
.method-figure {
  width: 100%;
  max-width: 900px;
  margin: 40px auto;
  border-radius: 16px;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.08);
}

.figure-caption {
  text-align: center;
  font-size: 15px;
  color: var(--apple-gray);
  margin-top: 16px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

/* Oracle Section */
.oracle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.oracle-card {
  background: #fff;
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.oracle-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
}

.oracle-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--apple-black);
}

.oracle-question {
  font-size: 15px;
  color: var(--apple-gray);
  font-style: italic;
  margin-bottom: 24px;
}

.oracle-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.oracle-table th {
  background: var(--apple-light-gray);
  padding: 12px 16px;
  text-align: center;
  font-weight: 600;
}

.oracle-table td {
  padding: 12px 16px;
  text-align: center;
  border-bottom: 1px solid #eee;
}

.oracle-table tr.highlight {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

.oracle-table tr.highlight td {
  font-weight: 600;
}

.oracle-image {
  width: 100%;
  border-radius: 12px;
  margin: 16px 0;
}

.oracle-result {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #eee;
  color: #30d158;
  font-weight: 600;
  font-size: 15px;
}

/* Architecture Section */
.arch-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.arch-feature {
  background: #fff;
  padding: 28px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.arch-feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.arch-feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--tah-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: #fff;
  font-size: 24px;
}

.arch-feature h4 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.arch-feature p {
  font-size: 14px;
  color: var(--apple-gray);
  line-height: 1.5;
}

.training-note {
  background: var(--apple-light-gray);
  padding: 20px 28px;
  border-radius: 12px;
  margin-top: 32px;
  text-align: center;
}

.training-note p {
  margin: 0;
  font-size: 15px;
}

/* Results Section */
.results-header {
  margin-bottom: 48px;
}

.results-header.centered {
  text-align: center;
}

/* Results Controls */
.results-controls {
  margin-top: 32px;
}

.model-selector {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.model-selector-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.model-selector-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--apple-gray);
  display: flex;
  align-items: center;
  gap: 6px;
}

.model-selector-label i {
  font-size: 12px;
}

.model-select {
  padding: 12px 40px 12px 16px;
  font-size: 15px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  background: #fff;
  color: var(--apple-black);
  cursor: pointer;
  min-width: 180px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2386868b' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  transition: all 0.2s ease;
}

.model-select:hover {
  border-color: var(--apple-blue);
}

.model-select:focus {
  outline: none;
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.model-selector-arrow {
  color: var(--apple-gray);
  font-size: 14px;
  margin-top: 24px;
}

/* Results Summary Card */
.results-summary-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  margin-top: 32px;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
}

.summary-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.summary-stat-item {
  text-align: center;
}

.summary-stat-value {
  font-size: 36px;
  font-weight: 700;
  background: var(--tah-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.summary-stat-label {
  font-size: 13px;
  color: var(--apple-gray);
  margin-top: 8px;
}

.table-scroll {
  overflow-x: auto;
  margin-top: 16px;
}

.filter-section {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  padding: 28px;
  border-radius: 20px;
  margin-bottom: 32px;
}

.filter-row {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.filter-card {
  background: #fff;
  padding: 20px 24px;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  min-width: 260px;
  flex: 1;
  max-width: 320px;
}

.filter-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.filter-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
}

.filter-icon.sharer {
  background: linear-gradient(135deg, #30d158, #34c759);
}

.filter-icon.receiver {
  background: linear-gradient(135deg, #0a84ff, #007aff);
}

.filter-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--apple-black);
}

.filter-select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 14px;
  background: #fff;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.filter-select:focus {
  outline: none;
  border-color: var(--apple-blue);
}

.filter-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--apple-blue);
}

.results-summary {
  background: var(--tah-gradient);
  padding: 32px;
  border-radius: 20px;
  color: #fff;
  margin-bottom: 32px;
}

.summary-title {
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 24px;
}

.summary-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.summary-stat {
  text-align: center;
}

.summary-value {
  font-size: 40px;
  font-weight: 700;
}

.summary-label {
  font-size: 14px;
  opacity: 0.9;
  margin-top: 4px;
}

.results-table-wrapper {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

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

.results-table th {
  background: var(--apple-light-gray);
  padding: 16px 12px;
  text-align: center;
  font-weight: 600;
  color: var(--apple-black);
  border-bottom: 2px solid #e0e0e0;
}

.results-table td {
  padding: 14px 12px;
  text-align: center;
  border-bottom: 1px solid #f0f0f0;
}

.results-table tbody tr:hover {
  background: #f8faff;
}

.results-table .tah-col {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

.results-table .best {
  font-weight: 700;
  color: #30d158;
}

.time-info {
  font-size: 12px;
  color: var(--apple-gray);
  margin-top: 4px;
}

.results-count {
  text-align: center;
  padding: 16px;
  font-size: 14px;
  color: var(--apple-gray);
  background: var(--apple-light-gray);
}

/* Contributions Section */
.contributions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.contribution-card {
  background: #fff;
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contribution-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
}

.contribution-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--tah-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: #fff;
  font-size: 28px;
}

.contribution-card h4 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.contribution-card p {
  font-size: 15px;
  color: var(--apple-gray);
  line-height: 1.5;
}

/* BibTeX Section */

/* Expandable Sections */

/* Dark section expandable hover fix */

/* Footer */

/* Scroll to top button */

/* Responsive */
@media (max-width: 900px) {

  .oracle-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-stats {
    gap: 32px;
  }

  .stat-value {
    font-size: 40px;
  }

  .filter-row {
    flex-direction: column;
  }

  .filter-card {
    max-width: 100%;
  }

  .filter-arrow {
    transform: rotate(90deg);
  }

  .insight-grid,
.arch-features,
.contributions-grid,
.motivation-grid {
    grid-template-columns: 1fr;
  }

  .overview-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .overview-figure {
    order: -1;
  }

  .model-selector {
    flex-direction: column;
    gap: 16px;
  }

  .model-selector-arrow {
    transform: rotate(90deg);
    margin-top: 0;
  }

  .summary-stat-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .summary-stat-value {
    font-size: 28px;
  }

  /* Mobile navigation */

  /* Global nav font size increase for mobile */
}

/* ============================================ */
/* TaH-Specific Additions                       */
/* ============================================ */

/* Hero Token Animation */
.hero-animation {
  max-width: 700px;
  margin: 48px auto 0;
  animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

.token-stream {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  font-size: 14px;
  line-height: 2;
  padding: 16px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: 12px;
}

.token {
  padding: 4px 12px;
  border-radius: 8px;
  display: inline-block;
  transition: all 0.3s ease;
}

.token-easy {
  background: #e8f5e9;
  color: #2e7d32;
}

.token-hard {
  background: #fff3e0;
  color: #e65100;
  animation: pulseBorder 2s ease-in-out infinite;
}

@keyframes pulseBorder {
  0%,
100% { box-shadow: 0 0 0 0 rgba(230, 81, 0, 0.2); }
  50% { box-shadow: 0 0 0 4px rgba(230, 81, 0, 0.15); }
}

/* Pipeline Interactive Visualization */
.pipeline-container {
  background: var(--apple-light-gray);
  border-radius: 20px;
  padding: 32px;
}

.pipeline-steps {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.pipeline-step {
  flex: 1;
  min-width: 120px;
  padding: 16px;
  background: #fff;
  border-radius: 12px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  border: 2px solid transparent;
}

.pipeline-step:hover {
  border-color: rgba(102, 126, 234, 0.3);
}

.pipeline-step.active {
  background: var(--tah-gradient);
  color: #fff;
}

.pipeline-step-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--apple-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 8px;
  font-size: 13px;
  font-weight: 600;
}

.pipeline-step.active .pipeline-step-number {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.pipeline-step-name {
  font-size: 13px;
  font-weight: 500;
}

.pipeline-visualization {
  min-height: 200px;
  border-radius: 16px;
  background: #fff;
  padding: 32px;
  margin-top: 16px;
}

.pipeline-content {
  display: none;
  animation: fadeIn 0.5s ease;
}

.pipeline-content.active {
  display: block;
}

/* Model Size Tabs */
.model-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
}

.model-tab {
  padding: 10px 24px;
  border-radius: 980px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  background: #fff;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--apple-black);
}

.model-tab:hover {
  border-color: var(--apple-blue);
  color: var(--apple-blue);
}

.model-tab.active {
  background: var(--tah-gradient);
  color: #fff;
  border-color: transparent;
}

.model-results {
  display: none;
}

.model-results.active {
  display: block;
}

/* TaH-highlighted table column */
.tah-col {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

/* Responsive additions for TaH-specific elements */
@media (max-width: 768px) {
  .pipeline-steps {
    flex-wrap: wrap;
  }

  .pipeline-step {
    min-width: calc(50% - 4px);
  }

  .model-tabs {
    flex-wrap: wrap;
  }

  .token-stream {
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .pipeline-step {
    min-width: 100%;
  }
}

/* Collapsed global navigation */

/* Keep project tiles consistent with the team hub. */