:root {
  --bg: #eef3fa;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #334155;
  --line: #d6deea;
  --primary: #1d4ed8;
  --primary-soft: #dbeafe;
  --accent: #0f766e;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e1e9f5;
  box-shadow: 0 3px 12px rgba(15, 23, 42, 0.05);
}
.topbar-inner {
  max-width: 1460px;
  margin: 0 auto;
  padding: 10px 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.nav a {
  text-decoration: none;
  color: #1e3a8a;
  font-size: 0.84rem;
  font-weight: 700;
  padding: 6px 4px;
  position: relative;
  transition: color 160ms ease, transform 140ms ease;
}
.nav a:hover {
  transform: translateY(-1px);
  color: #1d4ed8;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #1d4ed8 0%, #0f766e 100%);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}
.nav a:hover::after {
  transform: scaleX(1);
}
.container { max-width: 1460px; margin: 0 auto; padding: 28px; }
.hero {
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  padding: 0;
  text-align: center;
}
.hero-layout {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 22px;
  align-items: start;
}
.hero-main {
  min-width: 0;
}
.hero-topline {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    linear-gradient(135deg, #c7dbfb 0%, #bdeee4 100%) border-box;
  color: #1e40af;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  box-shadow: 0 6px 14px rgba(29, 78, 216, 0.12);
}
.hero-title {
  margin: 0;
  font-size: clamp(2rem, 3vw, 2.8rem);
  line-height: 1.16;
  max-width: 1200px;
  font-weight: 800;
  letter-spacing: 0.005em;
  color: #0f172a;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.hero-subtitle {
  margin: 10px auto 0;
  max-width: 820px;
  font-size: 0.98rem;
  color: #475569;
  text-align: center;
  display: block;
  text-wrap: balance;
}
.inline-figure {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  background: #fff;
}
.hero p { margin: 8px 0; color: var(--muted); }
.hero .hero-subtitle {
  margin: 10px auto 0;
}
.authors {
  color: #0f172a;
  font-weight: 700;
  font-size: 1.02rem;
}
.hero-aff {
  font-size: 0.95rem;
  color: #1f2937;
  font-weight: 600;
}
.hero-summary {
  max-width: 980px;
  font-size: 0.98rem;
}
.hero-side {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #d5e3f6;
  border-radius: 12px;
  padding: 14px 14px 12px;
}
.hero-side h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
  color: #0f172a;
}
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 10px;
}
.metric {
  background: #f8fbff;
  border: 1px solid #d8e5f6;
  border-radius: 8px;
  padding: 7px 6px;
  text-align: center;
}
.metric-num {
  display: block;
  font-size: 0.95rem;
  font-weight: 800;
  color: #1d4ed8;
  line-height: 1.1;
}
.metric-label {
  display: block;
  margin-top: 2px;
  font-size: 0.72rem;
  color: #475569;
  font-weight: 600;
}
.hero-side ul {
  margin: 0;
  padding-left: 18px;
  color: #334155;
}
.hero-side li {
  margin: 5px 0;
  font-size: 0.9rem;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.hero-chips { margin-top: 16px; }
.chip {
  background: #fff;
  border: 1px solid #bcd5fb;
  color: var(--primary);
  border-radius: 999px;
  padding: 6px 11px;
  font-size: 0.83rem;
  font-weight: 700;
}
@media (max-width: 980px) {
  .hero-layout {
    grid-template-columns: 1fr;
  }
  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
section { margin-top: 28px; }
h2 {
  margin: 0 0 18px;
  font-size: 1.24rem;
  font-weight: 800;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 0;
  letter-spacing: 0.005em;
  margin-left: auto;
  margin-right: auto;
  width: fit-content;
}
section > h2::before,
section > h2::after {
  content: "";
  display: block;
  width: clamp(120px, 18vw, 240px);
  height: 1px;
  background: linear-gradient(90deg, rgba(147,197,253,0.08) 0%, rgba(147,197,253,0.85) 50%, rgba(147,197,253,0.08) 100%);
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 14px;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 260ms ease, border-color 220ms ease, filter 220ms ease;
  position: relative;
  z-index: 1;
  will-change: transform;
}
.card:hover {
  transform: translateY(-2px) scale(1.3);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.12);
  border-color: #bfd3ef;
  filter: brightness(1.02);
  z-index: 20;
}
.outline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 12px;
}
.outline-item h3 { margin: 0 0 6px; font-size: 1.03rem; }
.outline-item p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.section-subtitle {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.95rem;
}
.outline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  align-items: start;
}
.outline-steps-four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.outline-steps-four + .outline-steps-four {
  margin-top: 14px;
}
.outline-step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  transition: border-color 180ms ease, box-shadow 220ms ease, transform 180ms ease;
  align-self: start;
  animation: cellIn 420ms ease;
}
.outline-step:hover {
  border-color: #bcd0ee;
  transform: translateY(-2px) scale(1.05);
  z-index: 20;
}
.step-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.step-num {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 0.03em;
}
.outline-step h3 {
  margin: 0;
  font-size: 1rem;
}
.outline-step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}
.step-tag {
  margin-top: auto;
  width: fit-content;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent);
  background: #ecfdf5;
  border: 1px solid #99f6e4;
  border-radius: 999px;
  padding: 3px 9px;
}
.related-papers {
  margin-top: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-10px) scale(0.98);
  padding-top: 8px;
  border-top: 1px dashed #cbd5e1;
  transform-origin: top;
  transition: max-height 560ms cubic-bezier(0.22, 1, 0.36, 1), opacity 420ms ease, transform 460ms cubic-bezier(0.22, 1, 0.36, 1), margin-top 360ms ease;
}
.outline-step.open .related-papers {
  max-height: 5000px;
  opacity: 1;
  transform: translateY(0) scale(1);
  margin-top: 6px;
}
.outline-step:hover .related-papers,
.outline-step:focus-within .related-papers {
  max-height: 5000px;
  opacity: 1;
  transform: translateY(0) scale(1);
  margin-top: 6px;
}
.session.open .related-papers {
  max-height: 5000px;
  opacity: 1;
  transform: translateY(0) scale(1);
  margin-top: 6px;
}
.session .related-papers {
  border-top: 1px solid #dbe5f3;
}
.session .related-papers ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 8px;
}
.session .related-papers li {
  margin: 0;
}
.session-paper-item {
  border: 1px solid #d7e3f3;
  border-radius: 8px;
  padding: 8px 10px;
  background: #fbfdff;
  cursor: pointer;
  transition: border-color 140ms ease, box-shadow 160ms ease, transform 140ms ease;
}
.session-paper-item:hover {
  border-color: #b7cdf1;
  box-shadow: 0 6px 14px rgba(29, 78, 216, 0.1);
  transform: translateY(-1px);
}
.session-paper-item:focus-visible {
  outline: 2px solid #93c5fd;
  outline-offset: 2px;
}
.session-paper-title {
  font-size: 0.9rem;
  font-weight: 650;
  color: #0f172a;
  margin-bottom: 3px;
}
.session-paper-meta {
  font-size: 0.78rem;
  color: #475569;
  margin-bottom: 6px;
}
.outline-step .related-papers {
  border-top: 1px solid #dbe5f3;
}
.outline-step .related-papers h4 {
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: #334155;
}
.outline-step .related-papers ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 8px;
  margin: 0;
}
.outline-step .related-papers li {
  margin: 0;
}
.outline-step .related-papers a {
  line-height: 1.4;
}
.outline-step .related-papers a::after {
  content: "";
}
.outline-step .related-papers a:hover {
  text-decoration: none;
}
.outline-paper-item {
  border: 1px solid #d7e3f3;
  border-radius: 8px;
  padding: 8px 10px;
  background: #fbfdff;
  cursor: pointer;
  transition: border-color 140ms ease, box-shadow 160ms ease, transform 140ms ease;
}
.outline-paper-item:hover {
  border-color: #b7cdf1;
  box-shadow: 0 6px 14px rgba(29, 78, 216, 0.1);
  transform: translateY(-1px);
}
.outline-paper-item:focus-visible {
  outline: 2px solid #93c5fd;
  outline-offset: 2px;
}
.outline-paper-title {
  font-size: 0.88rem;
  font-weight: 640;
  color: #0f172a;
  margin-bottom: 3px;
}
.outline-paper-meta {
  font-size: 0.78rem;
  color: #475569;
}
.outline-step.open {
  border-color: #9bb8ea;
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.11);
}
.related-papers h4 {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: #1e293b;
}
.related-papers ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.related-papers li {
  margin: 0;
  font-size: 0.9rem;
}
.related-papers a {
  display: block;
  position: relative;
  padding: 9px 34px 9px 11px;
  border-radius: 9px;
  border: 1px solid #dbe7f7;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  color: #1e3a8a;
  text-decoration: none;
  line-height: 1.4;
  transition: border-color 170ms ease, box-shadow 170ms ease, transform 140ms ease;
}
.related-papers a::after {
  content: "↗";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: #2563eb;
  font-weight: 700;
  font-size: 0.9rem;
}
.paper-title {
  display: block;
  font-size: 0.9rem;
  font-weight: 650;
  color: #0f172a;
  margin-bottom: 3px;
}
.paper-meta {
  display: block;
  font-size: 0.78rem;
  color: #475569;
}
.related-papers a:hover {
  border-color: #b7cdf1;
  box-shadow: 0 6px 16px rgba(29, 78, 216, 0.12);
  transform: translateY(-1px);
  text-decoration: none;
}

@media (max-width: 1200px) {
  .outline-steps-four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .outline-steps-four {
    grid-template-columns: 1fr;
  }
}
.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.filter-btn {
  border: 1px solid #bfdbfe;
  background: #fff;
  color: var(--primary);
  border-radius: 999px;
  padding: 6px 11px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}
.filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.session {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 260ms ease, border-color 220ms ease, filter 220ms ease;
  position: relative;
  z-index: 1;
  will-change: transform;
}
.session:hover {
  transform: translateY(-2px) scale(1.02);
  z-index: 20;
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.12);
  border-color: #bfd3ef;
  filter: brightness(1.02);
}
.session-head {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
  padding: 12px 14px;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
}
.badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  padding: 3px 9px;
  white-space: nowrap;
}
.session h3 { margin: 0; font-size: 1rem; }
.duration { color: var(--accent); font-weight: 700; font-size: 0.84rem; white-space: nowrap; }
.session-body {
  padding: 0 14px 14px;
  color: var(--muted);
  font-size: 0.95rem;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-8px);
  transition: max-height 520ms cubic-bezier(0.22, 1, 0.36, 1), opacity 360ms ease, transform 360ms ease, padding-top 260ms ease;
  padding-top: 0;
}
.session.open .session-body {
  max-height: 8000px;
  opacity: 1;
  transform: translateY(0);
  padding-top: 6px;
}
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}
.refs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.ref-card {
  border-top: 3px solid var(--primary);
}
.ref-card:hover {
  transform: translateY(-2px) scale(1.05);
  z-index: 20;
}
.ref-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  padding: 2px 9px;
  margin-bottom: 8px;
}
.ref-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}
.profile img {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 3px solid #ffffff;
  box-shadow: 0 8px 16px rgba(15, 23, 42, 0.16);
  margin: -58px auto 10px;
  object-fit: cover;
  display: block;
}
.profile-head {
  display: block;
  text-align: center;
  margin-bottom: 12px;
}
.profile {
  position: relative;
  margin-top: 52px;
  padding-top: 16px;
  animation: cellIn 460ms ease;
  cursor: pointer;
}
.profile:hover {
  transform: translateY(-2px) scale(1.05) !important;
  z-index: 30;
}
.profile h3 { margin: 0; font-size: 1.05rem; }
.profile-link {
  color: inherit;
  text-decoration: none;
}
.profile h3 .profile-link:hover {
  color: var(--primary);
}
.org { margin: 4px 0 8px; color: var(--accent); font-size: 0.9rem; font-weight: 700; }
.profile p { margin: 0; color: var(--muted); font-size: 0.94rem; }

.outline-steps .outline-step:nth-child(2),
.team-grid .profile:nth-child(2) { animation-delay: 40ms; }
.outline-steps .outline-step:nth-child(3),
.team-grid .profile:nth-child(3) { animation-delay: 80ms; }
.outline-steps .outline-step:nth-child(4),
.team-grid .profile:nth-child(4) { animation-delay: 120ms; }
.outline-steps .outline-step:nth-child(5),
.team-grid .profile:nth-child(5) { animation-delay: 160ms; }

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

@media (min-width: 1380px) {
  .team-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 1024px) {
  .container { padding: 22px; }
}

@media (max-width: 640px) {
  .container { padding: 16px; }
}