:root {
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --surface-alt: #F1F5F9;
  --text: #0F172A;
  --text-muted: #64748B;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-hover: 0 4px 6px rgba(0,0,0,0.1), 0 12px 24px rgba(0,0,0,0.08);
  --radius: 12px;
}

[data-theme="dark"] {
  --bg: #09090B;
  --surface: #18181B;
  --surface-alt: #27272A;
  --text: #F4F4F5;
  --text-muted: #A1A1AA;
  --accent: #60A5FA;
  --accent-hover: #93C5FD;
  --border: #3F3F46;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
  --shadow-hover: 0 4px 6px rgba(0,0,0,0.4), 0 12px 24px rgba(0,0,0,0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Inter", sans-serif;
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent), white 10%);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  top: -48px;
  left: 12px;
  z-index: 1001;
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}

.skip-link:focus-visible {
  top: 12px;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.narrow {
  width: min(840px, 92vw);
}

.section {
  padding: 4.5rem 0;
}

#main-nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: 60px;
  z-index: 1000;
  backdrop-filter: saturate(120%) blur(6px);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: transform 0.3s ease, background-color 0.25s ease, border-color 0.25s ease;
}

#main-nav.nav-solid {
  background: color-mix(in srgb, var(--surface), transparent 5%);
  border-bottom-color: var(--border);
}

#main-nav.nav-hidden {
  transform: translateY(-100%);
}

.nav-inner {
  width: min(1100px, 92vw);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#theme-toggle,
.nav-hamburger {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] #theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] #theme-toggle .icon-moon {
  display: inline;
}

.nav-hamburger {
  display: none;
  font-size: 1.2rem;
}

.hero {
  position: relative;
  min-height: 65vh;
  display: flex;
  align-items: center;
  padding-top: 7rem;
  overflow: clip;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(75% 55% at 80% 20%, color-mix(in srgb, var(--accent), transparent 86%), transparent),
    radial-gradient(65% 50% at 15% 85%, color-mix(in srgb, var(--accent), transparent 92%), transparent);
  animation: heroShift 8s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroShift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.65;
  }
  to {
    transform: translate3d(0, -8px, 0) scale(1.03);
    opacity: 0.9;
  }
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 2rem;
}

.hero-kicker {
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-summary {
  max-width: 64ch;
  margin-top: 1rem;
  color: var(--text-muted);
}

.stats-row {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.stat {
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.stat-value {
  margin: 0;
  font-weight: 700;
  font-size: 1.2rem;
}

.stat-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.hero-actions {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.62rem 1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.social-links {
  margin-top: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.social-links a {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.social-links a:hover {
  transform: translateY(-2px);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent), var(--border) 70%);
}

.hero-media {
  display: flex;
  justify-content: flex-end;
}

.hero-media img {
  width: min(100%, 360px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-hover);
}

.tag-list {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag-list span {
  display: inline-flex;
  padding: 0.38rem 0.72rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--surface-alt);
  font-size: 0.92rem;
  font-weight: 500;
}

.news-list,
.pub-list,
.awards-list {
  margin: 0;
  padding-left: 1.1rem;
}

.news-list li,
.pub-list li,
.awards-list li {
  margin-bottom: 0.9rem;
}

.news-list time {
  display: inline-block;
  min-width: 5.4rem;
  font-weight: 600;
  color: var(--text);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.section-head a {
  color: var(--text-muted);
  font-weight: 500;
}

.section-head a:hover {
  color: var(--accent);
}

.pub-list {
  list-style: decimal;
}

.timeline {
  position: relative;
  margin-left: 0.5rem;
  padding-left: 1.6rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  bottom: 0.3rem;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 1.15rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.98rem;
  top: 1rem;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 2px solid var(--accent);
  background: var(--bg);
}

.item-date {
  margin: 0.25rem 0 0.5rem;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.timeline-item ul {
  margin: 0;
  padding-left: 1.1rem;
}

.education-grid,
.projects-grid,
.awards-wrap {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card,
.awards-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1rem;
}

.project-card a {
  font-weight: 600;
}

.awards-group h3 {
  margin-bottom: 0.7rem;
  color: var(--text);
}

.awards-list {
  padding-left: 0;
  list-style: none;
}

.awards-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.year {
  flex: 0 0 auto;
  min-width: 3.1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 0.1rem 0.3rem;
  background: var(--surface-alt);
}

footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  margin-top: 1.2rem;
}

.footer-inner {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 2.2rem 0;
}

.footer-name {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-sub,
.footer-copy {
  color: var(--text-muted);
}

.footer-links,
.footer-downloads {
  margin: 0.85rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
}

.footer-links a,
.footer-downloads a {
  color: var(--text);
  font-weight: 500;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero::before,
  .social-links a,
  #main-nav {
    animation: none;
    transition: none;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 3.5rem 0;
  }

  .nav-hamburger {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    left: 4vw;
    right: 4vw;
    top: 60px;
    display: grid;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0 0 12px 12px;
    box-shadow: var(--shadow);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 0.95rem;
    border-top: 1px solid var(--border);
  }

  .nav-links li:first-child a {
    border-top: 0;
  }

  .nav-links.open {
    max-height: 360px;
  }

  .hero {
    min-height: 65vh;
    padding-top: 6.4rem;
  }

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

  .hero-media {
    justify-content: flex-start;
    order: -1;
  }

  .hero-media img {
    width: min(220px, 52vw);
    border-radius: 16px;
  }

  .stats-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stats-row .stat:last-child {
    grid-column: 1 / -1;
  }

  .timeline {
    margin-left: 0;
    padding-left: 1.2rem;
  }

  .timeline-item::before {
    left: -1.57rem;
  }

  .education-grid,
  .projects-grid,
  .awards-wrap,
  .section-head {
    grid-template-columns: 1fr;
    display: grid;
  }

  .section-head {
    gap: 0.3rem;
  }
}

.timeline-item:nth-child(odd).reveal {
  transform: translateX(-12px);
}

.timeline-item:nth-child(even).reveal {
  transform: translateX(12px);
}

.timeline-item.in-view {
  transform: translateX(0);
}

@media (prefers-reduced-motion: reduce) {
  .timeline-item:nth-child(odd).reveal,
  .timeline-item:nth-child(even).reveal,
  .timeline-item.in-view {
    transform: none;
  }
}

/* Publication citation badge */
.pub-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent), transparent 88%);
  border: 1px solid color-mix(in srgb, var(--accent), transparent 70%);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  margin: 0 0.25rem;
  vertical-align: middle;
}

.pub-list li {
  line-height: 1.6;
  margin-bottom: 1.2rem;
}