:root {
  color-scheme: light;
  --bg: #0b0f19;
  --surface: #141a2a;
  --card: #1a2236;
  --text: #e6ecff;
  --muted: #9fb0d1;
  --accent: #5b8bff;
  --accent-2: #7de2ff;
  --accent-3: #9a7dff;
  --shadow: 0 12px 40px rgba(4, 12, 28, 0.35);
  --shadow-soft: 0 10px 30px rgba(9, 14, 30, 0.25);
  --glass: rgba(15, 20, 36, 0.65);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", "PingFang SC", sans-serif;
  background: radial-gradient(circle at top, #1a2340, var(--bg));
  color: var(--text);
  line-height: 1.6;
  scroll-behavior: smooth;
  min-height: 100vh;
}

.main {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px max(5vw, calc(50% - 580px));
  backdrop-filter: blur(16px);
  background: var(--glass);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 24px rgba(6, 10, 24, 0.35);
}

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

.avatar {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(15, 22, 46, 0.85);
  box-shadow: var(--shadow);
  object-fit: contain;
  padding: 3px;
  flex-shrink: 0;
}

.brand h1 {
  margin: 0;
  font-size: 1.4rem;
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav {
  display: flex;
  gap: 18px;
  font-weight: 600;
}

.nav a {
  padding: 8px 12px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav a:hover {
  background: rgba(91, 139, 255, 0.2);
}

.section {
  padding: 56px max(5vw, calc(50% - 580px));
  scroll-margin-top: 96px;
  position: relative;
}

.section::after {
  content: "";
  position: absolute;
  left: max(5vw, calc(50% - 580px));
  right: max(5vw, calc(50% - 580px));
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero {
  display: grid;
  gap: 16px 40px;
  grid-template-columns: 230px 1fr;
  align-items: start;
}

.hero-profile {
  display: flex;
  justify-content: center;
  align-self: start;
}

.profile-photo {
  width: 200px;
  height: 264px;
  border-radius: 20px;
  overflow: hidden;
  border: 2px solid rgba(125, 226, 255, 0.35);
  box-shadow: var(--shadow);
  background: linear-gradient(160deg, #1e2d4e, var(--card));
  flex-shrink: 0;
}

.profile-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-cta {
  grid-column: 1 / -1;
}

.hero-bottom {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.section-sublabel {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 4px 0 -4px;
}

.edu-inline {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.edu-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  font-size: 0.86rem;
  color: var(--muted);
  padding: 14px 16px;
  background: rgba(45, 65, 110, 0.55);
  border-radius: 12px;
  border-top: 2px solid var(--accent);
  line-height: 1.65;
}

.edu-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  padding: 5px;
}

.edu-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.edu-item strong {
  font-size: 0.95rem;
  color: var(--text);
  display: block;
  margin-bottom: 2px;
}

.team-carousel {
  margin-bottom: 28px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 20px 8vw auto auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(122, 226, 255, 0.2), transparent 65%);
  pointer-events: none;
}

.hero-text h2 {
  font-size: clamp(1.8rem, 2.8vw, 2.6rem);
  margin: 0 0 12px;
}

.title-sub {
  font-size: 0.6em;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.inline-link {
  color: var(--accent-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s ease;
}

.inline-link:hover {
  opacity: 0.75;
}

.hero-quote {
  margin: 14px 0 0;
  padding: 10px 16px;
  border-left: 3px solid var(--accent-2);
  background: rgba(125, 226, 255, 0.06);
  border-radius: 0 10px 10px 0;
  font-style: italic;
  color: var(--accent-2);
  font-size: 0.95rem;
}

.hero-text p {
  color: var(--muted);
}

.recruit-callout {
  margin: 14px 0 0;
  padding: 10px 16px;
  border-left: 3px solid #ffd166;
  background: rgba(255, 209, 102, 0.07);
  border-radius: 0 10px 10px 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
}

.recruit-callout strong {
  color: #ffd166;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: transparent;
  border-radius: 0;
  border: none;
  box-shadow: none;
}

.research-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  margin-right: 4px;
}

.research-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.research-tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.rt-blue {
  background: rgba(91, 139, 255, 0.15);
  color: #a8c4ff;
  border: 1px solid rgba(91, 139, 255, 0.4);
}

.rt-cyan {
  background: rgba(125, 226, 255, 0.12);
  color: #7de2ff;
  border: 1px solid rgba(125, 226, 255, 0.35);
}

.rt-purple {
  background: rgba(154, 125, 255, 0.15);
  color: #c5aeff;
  border: 1px solid rgba(154, 125, 255, 0.4);
}

.cta {
  display: flex;
  gap: 16px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.button {
  padding: 12px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0f19;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.button.ghost {
  background: transparent;
  border: 1px solid rgba(125, 226, 255, 0.6);
  color: var(--text);
  box-shadow: none;
}

.carousel {
  position: relative;
  background: var(--surface);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow);
  min-height: 320px;
  border: 1px solid rgba(125, 226, 255, 0.15);
}

.carousel-track {
  display: flex;
  transition: transform 0.6s ease;
}

.slide {
  min-width: 100%;
  background-image: var(--img);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  background-color: #0d1323;
  aspect-ratio: 5 / 2;
}

.gallery-caption {
  margin: 52px 0 0;
  font-size: 0.95rem;
  color: var(--muted);
  font-style: italic;
  letter-spacing: 0.04em;
  opacity: 0.75;
}

.gallery-carousel .slide {
  background-size: cover;
  background-color: #0a0e1a;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(10, 14, 26, 0.7);
  color: var(--text);
  font-size: 1.8rem;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.carousel-btn:hover {
  transform: translateY(-50%) scale(1.05);
  background: rgba(90, 138, 255, 0.7);
}

.carousel-btn.prev {
  left: 16px;
}

.carousel-btn.next {
  right: 16px;
}

.carousel-dots {
  position: absolute;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
}

.carousel-dots button.active {
  background: var(--accent-2);
}

.content h2 {
  font-size: clamp(1.8rem, 2.5vw, 2.4rem);
  margin: 0;
}

.content-block {
  background: rgba(18, 24, 40, 0.7);
  border-radius: 18px;
  padding: 20px 24px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
}

.note {
  color: var(--muted);
  margin-bottom: 18px;
}

.list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
}

.list.compact {
  gap: 6px;
}

/* ── Recruit section ─────────────────────────────── */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.overview-col {
  background: var(--card);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.05);
  padding: 20px 24px;
}

.overview-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-2);
  margin: 0 0 14px;
  letter-spacing: 0.02em;
}

.recruit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.recruit-card {
  background: var(--card);
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform 0.2s ease, border 0.2s ease;
}

.recruit-card:hover {
  transform: translateY(-4px);
  border-color: rgba(125, 226, 255, 0.25);
}

.recruit-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.03);
}

.recruit-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.recruit-card-head h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
}

.recruit-list {
  list-style: none;
  padding: 14px 20px 18px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.recruit-list li {
  font-size: 0.87rem;
  color: var(--muted);
  line-height: 1.6;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.recruit-list li::before {
  content: "›";
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

.tag-ms {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 20px;
  background: rgba(122, 162, 255, 0.15);
  color: #7aa2ff;
  white-space: nowrap;
  flex-shrink: 0;
}

.list li {
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  padding: 20px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(125, 226, 255, 0.3);
}

.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--muted);
}

/* ── Publication cards ───────────────────────────── */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pub-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
  align-items: stretch;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.pub-item:hover {
  border-color: rgba(125, 226, 255, 0.3);
  transform: translateX(4px);
}

.pub-thumb {
  width: 180px;
  height: 100%;
  min-height: 110px;
  object-fit: cover;
  border-radius: 0;
  background: #0d1323;
  display: block;
  cursor: zoom-in;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  flex-shrink: 0;
}

.pub-thumb:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 24px rgba(0,0,0,0.5);
}

.pub-thumb-empty {
  background: linear-gradient(135deg, #1a2236, #0f1624);
  border-right: 1px dashed rgba(255,255,255,0.08);
  width: 180px;
  min-height: 110px;
}

.pub-body {
  padding: 16px 24px 16px 28px;
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.venue-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.venue-iclr   { background: rgba(91,139,255,0.2);  color: #a8c2ff; border: 1px solid rgba(91,139,255,0.4); }
.venue-icml   { background: rgba(255,184,76,0.15); color: #ffc95c; border: 1px solid rgba(255,184,76,0.35); }
.venue-aaai   { background: rgba(255,100,100,0.15); color: #ff9e9e; border: 1px solid rgba(255,100,100,0.35); }
.venue-neurips{ background: rgba(154,125,255,0.2); color: #c5aeff; border: 1px solid rgba(154,125,255,0.4); }
.venue-ijcai  { background: rgba(6,214,160,0.15);  color: #5eeecb; border: 1px solid rgba(6,214,160,0.3); }
.venue-journal{ background: rgba(125,226,255,0.1); color: #7de2ff; border: 1px solid rgba(125,226,255,0.25); }
.venue-conf   { background: rgba(180,180,180,0.1); color: #b0bccf; border: 1px solid rgba(180,180,180,0.2); }

.rank-tag {
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(255,255,255,0.05);
  padding: 2px 8px;
  border-radius: 999px;
}

.cite-tag {
  font-size: 0.72rem;
  color: #ffd166;
  background: rgba(255, 209, 102, 0.12);
  border: 1px solid rgba(255, 209, 102, 0.3);
  padding: 2px 8px;
  border-radius: 999px;
}

.pub-title {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

.pub-authors {
  margin: 0 0 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.pub-authors strong {
  color: var(--accent-2);
}

.pub-category {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text);
  margin: 32px 0 14px;
  padding: 10px 18px;
  background: linear-gradient(90deg, rgba(91,139,255,0.15) 0%, rgba(91,139,255,0.04) 100%);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
}

.pub-category:first-child {
  margin-top: 0;
}

.pub-links {
  display: flex;
  gap: 10px;
}

.pub-links a {
  font-size: 0.78rem;
  padding: 3px 12px;
  border-radius: 999px;
  background: rgba(91,139,255,0.15);
  color: var(--accent);
  border: 1px solid rgba(91,139,255,0.3);
  transition: background 0.2s ease;
}

.pub-links a:hover {
  background: rgba(91,139,255,0.35);
}

/* ── Member cards ─────────────────────────────────── */
.group-label {
  margin: 32px 0 14px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  opacity: 0.85;
}

.member-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.member-card {
  background: var(--card);
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
  padding: 20px 16px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.member-card:hover {
  transform: translateY(-5px);
  border-color: rgba(125, 226, 255, 0.3);
}

.member-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: rgba(20, 28, 50, 0.85);
  background-image: var(--pokemon-img, radial-gradient(circle at 35% 35%, white 0%, var(--ac) 60%, #0b0f19 100%));
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

.member-info h4 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.member-info p {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.member-dir {
  margin: 6px 0 0;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: 0.01em;
}

.member-fun {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
  font-style: italic;
  opacity: 0.65;
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-phd {
  background: rgba(91, 139, 255, 0.2);
  color: #7de2ff;
  border: 1px solid rgba(125, 226, 255, 0.3);
}

.badge-ms {
  background: rgba(154, 125, 255, 0.2);
  color: #c9b8ff;
  border: 1px solid rgba(154, 125, 255, 0.3);
}

.badge-bs {
  background: rgba(255, 143, 163, 0.15);
  color: #ffb3c1;
  border: 1px solid rgba(255, 143, 163, 0.3);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.contact-grid > div {
  background: rgba(20, 28, 46, 0.7);
  border-radius: 16px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
}

.site-footer {
  padding: 30px 8vw 50px;
  color: var(--muted);
  text-align: center;
}

.site-footer p {
  margin: 0;
}

/* ── Lightbox ────────────────────────────────────── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(4, 8, 20, 0.92);
  backdrop-filter: blur(10px);
  align-items: center;
  justify-content: center;
  padding: 32px;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: 16px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.7);
  object-fit: contain;
  animation: lb-in 0.22s ease;
}

@keyframes lb-in {
  from { opacity: 0; transform: scale(0.93); }
  to   { opacity: 1; transform: scale(1); }
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  font-size: 1.3rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.2s ease;
}

.lightbox-close:hover {
  background: rgba(255,255,255,0.25);
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    gap: 16px;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }

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

  .hero-profile {
    display: none;
  }
}