/* ============================================================
   KDD 2026 Tutorial — LLM Interpretability
   Stylesheet inspired by the GenRec tutorial design
   ============================================================ */

/* ---------- Base ---------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 4rem;
}
body {
  font-family: 'Noto Sans', sans-serif;
  color: #1f2937;
  line-height: 1.7;
  padding-top: 3.5rem;
}

/* ---------- Navbar ---------- */
.navbar {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(6px);
  -webkit-backdrop-filter: saturate(180%) blur(6px);
  border-bottom: 1px solid #eee;
  z-index: 30;
}
.brand-text {
  font-size: 0.95rem;
  color: #111 !important;
  letter-spacing: -0.01em;
}
.navbar-item {
  font-size: 0.88rem;
  font-weight: 600;
  color: #374151;
  transition: color 0.2s;
}
.navbar-item:hover {
  color: hsl(204, 86%, 45%);
  background: transparent !important;
}

/* ---------- Hero / Publication Header ---------- */
.publication-header {
  background: linear-gradient(170deg, #f0f5ff 0%, #ffffff 50%, #f8f0ff 100%);
  padding: 3.5rem 1.5rem 3rem;
}
.publication-venue {
  margin-bottom: 1.2rem;
}
.venue-tag {
  background: linear-gradient(135deg, hsl(204, 86%, 50%), hsl(264, 60%, 55%));
  color: #fff !important;
  font-weight: 700;
  font-size: 0.85rem !important;
  padding: 0.55em 1.2em;
}
.publication-title {
  font-family: 'Playfair Display', serif;
  font-size: 2.4rem;
  font-weight: 700;
  color: #111;
  line-height: 1.25;
  margin-bottom: 1.3rem;
  max-width: 52rem;
  margin-left: auto;
  margin-right: auto;
}
.publication-authors {
  font-size: 1rem;
  color: #374151;
  margin-bottom: 0.5rem;
}
.publication-authors .author {
  white-space: nowrap;
}
.publication-authors sup {
  font-size: 0.7em;
  color: hsl(204, 86%, 45%);
}
.publication-affiliations {
  font-size: 0.88rem;
  color: #6b7280;
  margin-bottom: 1.3rem;
}
.publication-affiliations .affiliation {
  margin: 0 0.6rem;
}
.publication-meta {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.publication-meta .tag {
  font-size: 0.82rem !important;
  font-weight: 500;
  border: 1px solid #e5e7eb;
}
.publication-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.disabled-btn {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- Section Titles ---------- */
.section-title {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.5rem;
}
.section-subtitle {
  font-size: 0.95rem;
  color: #6b7280;
  margin-bottom: 2rem;
}

/* ---------- Sections ---------- */
.section {
  padding: 3.5rem 1.5rem;
}
.section-light {
  background: #f9fafb;
}

/* ---------- Abstract ---------- */
.abstract-content p {
  font-size: 0.95rem;
  color: #374151;
  text-align: justify;
}

/* ---------- Highlight Cards ---------- */
.highlight-cards {
  margin-top: 1rem;
}
.card-highlight {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem 1.2rem;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
  height: 100%;
}
.card-highlight:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}
.card-highlight .icon-large {
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: hsl(204, 86%, 95%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.8rem;
}
.card-highlight .icon-large i {
  font-size: 1.2rem;
  color: hsl(204, 86%, 45%);
}
.card-highlight h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.4rem;
}
.card-highlight p {
  font-size: 0.85rem;
  color: #6b7280;
  line-height: 1.55;
}

/* ---------- Audience ---------- */
.audience-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.6rem;
}
.audience-heading i {
  color: hsl(204, 86%, 45%);
  margin-right: 0.3rem;
}
.audience-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}
.audience-list li {
  font-size: 0.9rem;
  color: #374151;
  padding: 0.35rem 0;
  padding-left: 1.3rem;
  position: relative;
}
.audience-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: hsl(204, 86%, 65%);
}
.audience-list .check,
.audience-list .star {
  position: absolute;
  left: 0;
  font-size: 0.85rem;
}
.audience-list .check { color: #16a34a; }
.audience-list .star { color: #f59e0b; }
.audience-list li:has(.check)::before,
.audience-list li:has(.star)::before {
  display: none;
}

/* ---------- Schedule ---------- */
.schedule {
  border-left: 3px solid hsl(204, 86%, 80%);
  padding-left: 0;
  margin-top: 1rem;
}
.schedule-item {
  display: flex;
  gap: 1.5rem;
  padding: 1.2rem 0;
  border-bottom: 1px dashed #e5e7eb;
  margin-left: 1.5rem;
  position: relative;
}
.schedule-item::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 1.7rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: hsl(204, 86%, 50%);
  border: 2px solid #fff;
  transform: translateX(-50%);
  margin-left: -1.5px;
}
.schedule-item:last-child {
  border-bottom: none;
}
.schedule-time {
  min-width: 6rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  flex-shrink: 0;
}
.schedule-duration {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: hsl(204, 86%, 40%);
}
.schedule-slot {
  font-size: 0.78rem;
  font-weight: 600;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.schedule-detail h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.2rem;
}
.schedule-format {
  font-size: 0.78rem;
  color: hsl(204, 86%, 45%);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 0.3rem;
}
.schedule-detail ul {
  margin: 0;
  padding-left: 1.1rem;
}
.schedule-detail li {
  font-size: 0.88rem;
  color: #4b5563;
  line-height: 1.5;
  margin-bottom: 0.15rem;
}

/* Coffee Break */
.schedule-break {
  background: #fffaf2;
  border-radius: 8px;
  border-bottom-color: #fde6c4;
  padding: 0.8rem 1rem;
}
.schedule-break::before {
  background: #f59e0b;
}
.schedule-break .schedule-slot {
  color: #b45309;
}
.schedule-break .schedule-detail h3 {
  color: #b45309;
}

/* ---------- Presenters ---------- */
.presenter-grid {
  margin-top: 1.5rem;
}
.presenter-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.6rem 1.3rem;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
  height: 100%;
}
.presenter-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
}
.presenter-avatar {
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  background: linear-gradient(135deg, hsl(204, 86%, 92%), hsl(264, 60%, 92%));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.8rem;
  overflow: hidden;
  border: 3px solid #fff;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.12);
}
.presenter-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.presenter-avatar i {
  font-size: 1.5rem;
  color: hsl(204, 86%, 45%);
}
.presenter-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.15rem;
}
.presenter-affil {
  font-size: 0.82rem;
  color: hsl(204, 86%, 45%);
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.presenter-bio {
  font-size: 0.83rem;
  color: #6b7280;
  line-height: 1.55;
  text-align: left;
}
.contributor-card {
  border-style: dashed;
}

/* ---------- References ---------- */
.references-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.reference-item {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  padding: 0.7rem 0;
  border-bottom: 1px solid #f3f4f6;
}
.reference-item:last-child {
  border-bottom: none;
}
.ref-tag {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  color: hsl(204, 86%, 45%);
  background: hsl(204, 86%, 95%);
  padding: 0.2em 0.6em;
  border-radius: 4px;
  white-space: nowrap;
  margin-top: 0.15rem;
}
.reference-item p {
  font-size: 0.85rem;
  color: #4b5563;
  line-height: 1.5;
  margin: 0;
}

/* ---------- BibTeX ---------- */
pre {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 1.3rem 1.5rem;
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
}

/* ---------- Slides ---------- */
.slides-box {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}
.slides-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  transition: transform 0.25s, box-shadow 0.25s;
}
.slides-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
}
.slides-icon {
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: hsl(204, 86%, 95%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.slides-icon i {
  font-size: 1.2rem;
  color: hsl(204, 86%, 45%);
}
.slides-info {
  flex: 1;
}
.slides-info h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #111;
  margin-bottom: 0.15rem;
}
.slides-info p {
  font-size: 0.83rem;
  color: #6b7280;
  margin: 0;
}
.slides-actions {
  flex-shrink: 0;
}

/* ---------- Contact ---------- */
.contact-text {
  font-size: 0.95rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
}
.contact-cards {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.contact-card {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 0.8rem 1.5rem;
  color: hsl(204, 86%, 45%);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}
.contact-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
  border-color: hsl(204, 86%, 65%);
  color: hsl(204, 86%, 35%);
}
.contact-card i {
  font-size: 1.1rem;
}

/* ---------- Footer ---------- */
.footer {
  background: #111827;
  padding: 2rem 1.5rem;
}
.footer-links {
  margin-bottom: 0.8rem;
}
.footer-links a {
  color: #9ca3af;
  font-size: 1.2rem;
  margin: 0 0.5rem;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: #fff;
}
.footer-text {
  color: #9ca3af;
  font-size: 0.82rem;
  margin-bottom: 0.3rem;
}
.footer-credit {
  color: #6b7280;
  font-size: 0.75rem;
}
.footer-credit a {
  color: #9ca3af;
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .publication-title {
    font-size: 1.7rem !important;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .schedule-item {
    flex-direction: column;
    gap: 0.6rem;
  }
  .schedule-time {
    flex-direction: row;
    gap: 0.8rem;
    border-bottom: 1px dashed #e5e7eb;
    padding-bottom: 0.4rem;
  }
  .publication-meta {
    flex-direction: column;
    align-items: center;
  }
  .slides-item {
    flex-direction: column;
    text-align: center;
    gap: 0.8rem;
  }
}