/* ========== CSS Variables ========== */
:root {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --accent: #4f46e5;
  --accent-light: #6366f1;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(99,102,241,0.4);
  --green: #059669;
  --amber: #d97706;
  --radius: 12px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --mono: 'JetBrains Mono', monospace;
}

/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-light); }

img { max-width: 100%; display: block; }

.container { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

.nav-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo, .nav-logo { font-weight: 700; font-size: 1.05rem; color: var(--text); letter-spacing: -0.02em; }

.site-nav { display: flex; gap: 24px; }
.site-nav a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s;
  position: relative;
}
.site-nav a:hover, .site-nav a.active { color: var(--text); }
.site-nav a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.menu-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--text); }
.menu-toggle svg { width: 22px; height: 22px; }

/* ========== Hero ========== */
.hero {
  padding: 80px 0 64px;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

/* Aurora canvas sits behind everything */
#auroraCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  display: flex;
  gap: 64px;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

.hero-avatar {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

/* Static ring */
.avatar-ring {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, #334155 0%, #475569 50%, #64748b 100%);
  overflow: hidden;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.05em;
}

/* Social icons row */
.avatar-socials {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.avatar-social-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s var(--ease);
  color: var(--text-2);
}
.avatar-social-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}
.avatar-social-btn svg { width: 16px; height: 16px; }

/* Stats row */
.avatar-stats {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 0;
  width: 100%;
  justify-content: center;
  gap: 0;
}

.avatar-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 0 18px;
  min-width: 68px;
}

.stat-num {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1.2;
  white-space: nowrap;
}

.stat-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.avatar-stat + .avatar-stat { border-left: 1px solid var(--border); }

.avatar-stat-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
}

/* Hero content */
.hero-content { flex: 1; min-width: 0; }

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  background: rgba(51, 65, 85, 0.08);
  border: 1px solid rgba(51, 65, 85, 0.2);
  border-radius: 6px;
  padding: 4px 12px;
  margin-bottom: 14px;
  letter-spacing: 0.01em;
}

.collab-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: #059669;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 20px;
  padding: 5px 16px;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hero-name {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
  background: linear-gradient(
    90deg,
    #0f172a 0%, #334155 30%,
    #6366f1 50%,
    #334155 70%, #0f172a 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: name-shine 3.5s linear infinite;
}

@keyframes name-shine {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.hero-name-cn {
  font-weight: 600;
  font-size: 1.8rem;
  opacity: 0.55;
  margin-left: 8px;
}

.hero-subtitle {
  font-size: 0.92rem;
  color: var(--text-2);
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.6;
}

.hero-bio {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 20px;
}
.hero-bio strong { color: var(--text); font-weight: 600; }

.hero-tagline {
  font-size: 0.88rem;
  color: var(--text-2);
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.6;
}

.hero-actions { display: flex; gap: 10px; margin-bottom: 24px; flex-wrap: wrap; }
.hero-actions a {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 8px;
  transition: all 0.2s;
}
.hero-actions .btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}
.hero-actions .btn-primary:hover { background: var(--accent-light); }
.hero-actions .btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.hero-actions .btn-secondary:hover { border-color: var(--accent-light); color: var(--accent); }

/* Hero links row */
.hero-links { display: flex; gap: 10px; margin-bottom: 24px; flex-wrap: wrap; }
.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 8px;
  color: var(--text);
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.hero-link svg { width: 15px; height: 15px; flex-shrink: 0; }
.hero-link:hover { border-color: var(--accent-light); color: var(--accent); }
.hero-link-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.hero-link-primary:hover { background: var(--accent-light); color: #fff; }

/* ========== Research Interests Bar ========== */
.interests-bar {
  padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.interests-inner,
.interests-list {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.interest-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-2);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid transparent;
  transition: all 0.25s var(--ease);
  cursor: default;
}
.interest-item:hover {
  border-color: rgba(99,102,241,0.35);
  background: rgba(99,102,241,0.06);
  color: var(--text);
  box-shadow: 0 0 12px rgba(99,102,241,0.15), 0 0 24px rgba(139,92,246,0.08);
  transform: translateY(-1px);
}
.interest-item svg { width: 15px; height: 15px; color: var(--accent-light); flex-shrink: 0; }

/* ========== Section Title ========== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 36px;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 36px;
}

.section-header .section-title {
  margin-bottom: 0;
}

.title-accent { color: var(--accent-light); margin-right: 4px; }

.history-toggle-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}
.history-toggle-btn:hover {
  border-color: var(--accent-light);
  color: var(--text);
}
.history-toggle-btn svg {
  width: 14px;
  height: 14px;
}
.news-item-old {
  opacity: 0.6;
}
.news-item-old.hidden {
  display: none;
}

/* ========== News ========== */
.news-list { display: flex; flex-direction: column; gap: 12px; }

.news-item {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.news-item:last-child { border-bottom: none; }

.news-date {
  flex-shrink: 0;
  width: 80px;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-3);
}

.news-item p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.6;
}
.news-item p strong { color: var(--text); }
.news-item p em { color: var(--text); font-style: normal; }

/* ========== Publications ========== */
.pub-list { display: flex; flex-direction: column; gap: 16px; }

.pub-card {
  position: relative;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.pub-card:hover {
  border-color: rgba(99,102,241,0.45);
  box-shadow: 0 4px 24px rgba(99,102,241,0.13), 0 0 0 1px rgba(99,102,241,0.08);
  transform: translateY(-2px);
}

/* Thumbnail on the left */
.pub-thumb {
  flex-shrink: 0;
  width: 160px;
  min-height: 160px;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.pub-thumb img,
.pub-thumb-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Patent cards without image */
.pub-card-noimg {
  display: flex;
  padding: 0;
}
.pub-card-noimg .pub-body {
  padding: 18px 22px;
}

/* Placeholder when no real image */
.pub-thumb-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  min-height: 160px;
  background: linear-gradient(145deg, #eef0ff 0%, #e0e4ff 100%);
}

.pub-thumb-placeholder .pub-thumb-icon {
  width: 36px;
  height: 36px;
  color: var(--accent);
  opacity: 0.6;
}

/* Content area */
.pub-body { flex: 1; padding: 22px 24px; }

.pub-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
}
.pub-badge-published { background: rgba(5,150,105,0.1); color: var(--green); }
.pub-badge-review { background: rgba(217,119,6,0.1); color: var(--amber); }
.pub-badge-granted { background: rgba(99,102,241,0.1); color: var(--accent); }

.pub-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 6px;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-2);
  margin-bottom: 6px;
}

.pub-venue {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-3);
  margin-bottom: 10px;
}

.venue-tag {
  font-weight: 600;
  color: var(--accent);
  background: rgba(99,102,241,0.08);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.pub-role {
  font-weight: 600;
  color: var(--text-2);
}
.pub-role.first-author { color: var(--green); }

.pub-desc {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}

/* ========== Current Work ========== */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.work-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.25s var(--ease);
}

.work-card:hover {
  border-color: rgba(99,102,241,0.45);
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(99,102,241,0.13);
}

.work-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.work-icon svg {
  width: 22px;
  height: 22px;
  color: var(--accent-light);
}

.work-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.work-tag {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.work-tag-research {
  color: #7c3aed;
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.25);
}

.work-tag-work {
  color: var(--accent-light);
  background: rgba(51, 65, 85, 0.08);
  border: 1px solid rgba(51, 65, 85, 0.2);
}

.work-desc {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .work-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Timeline (Work Experience) ========== */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}
.timeline-item:last-child { padding-bottom: 0; }

.tl-dot {
  position: absolute;
  left: -24px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 3px solid var(--text-3);
}
.tl-dot-primary {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.2);
}

.tl-content {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.tl-content:hover {
  border-color: rgba(99,102,241,0.45);
  box-shadow: 0 4px 20px rgba(99,102,241,0.1);
}

.tl-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
}

.tl-company {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.tl-role {
  font-size: 0.82rem;
  color: var(--text-2);
  margin-top: 2px;
}

.tl-date {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-3);
  white-space: nowrap;
}

.tl-bullets { display: flex; flex-direction: column; gap: 10px; }
.tl-bullet {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.65;
}
.bullet-label {
  font-weight: 700;
  color: var(--text);
}

/* ========== Research Experience ========== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.research-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all 0.25s var(--ease);
}
.research-card:hover {
  border-color: rgba(99,102,241,0.45);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(99,102,241,0.12), 0 0 0 1px rgba(99,102,241,0.08);
}

.research-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.4;
}

.rc-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}

.rc-header h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  margin: 0;
  flex: 1;
}

.rc-date {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-3);
  white-space: nowrap;
}

.research-card .research-date {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-3);
  margin-bottom: 8px;
}

.research-card p {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
}
.research-card strong { color: var(--text); }

/* ========== Education ========== */
.edu-list { display: flex; flex-direction: column; gap: 16px; }

.edu-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.edu-item:hover {
  border-color: rgba(99,102,241,0.45);
  box-shadow: 0 4px 20px rgba(99,102,241,0.1);
}

.edu-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
}
.edu-icon svg { width: 28px; height: 28px; }

.edu-body { flex: 1; min-width: 0; }

.edu-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 8px;
}

.edu-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.edu-school {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.edu-degree {
  font-size: 0.88rem;
  color: var(--text-2);
  margin-top: 2px;
}

.edu-right {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.edu-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-3);
  white-space: nowrap;
}

.edu-gpa {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
}

.edu-rank {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-3);
}

.edu-note {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
}

.edu-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.edu-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(99,102,241,0.08);
  color: var(--accent);
}

.edu-desc {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ========== Footer ========== */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  font-size: 0.82rem;
  color: var(--text-3);
}

.footer-sub {
  font-size: 0.78rem;
  color: var(--text-3);
  margin-top: 4px;
  opacity: 0.7;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column;
    gap: 32px;
    align-items: center;
    text-align: center;
  }

  .hero-content { text-align: center; }
  .hero-actions { justify-content: center; }

  .site-nav { display: none; flex-direction: column; gap: 0; position: absolute; top: 56px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 24px; }
  .menu-toggle { display: block; }

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

  .pub-card { flex-direction: column; }
  .pub-thumb { width: 100%; height: 120px; border-right: none; border-bottom: 1px solid var(--border); }

  .edu-header { flex-direction: column; gap: 4px; }
  .edu-right { align-items: flex-start; }
  .tl-header { flex-direction: column; gap: 4px; }
  .hero-links { justify-content: center; }
  .rc-header { flex-direction: column; gap: 4px; }
}

/* ========== Sub-section titles ========== */
.sub-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.pub-subsection {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.pub-subsection:first-of-type { margin-top: 0; }