:root {
  --bg: #0a0e14;
  --bg-soft: #0e131b;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #4fd1c5;
  --accent-2: #7c9cff;
  --border: #1c2530;
  --max-width: 860px;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  position: relative;
}

#lattice-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.55;
  pointer-events: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-2);
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 14, 20, 0.75);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.logo {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.logo-bracket {
  color: var(--accent);
}

.logo:hover {
  color: var(--text);
}

nav a {
  margin-left: 24px;
  color: var(--muted);
  font-size: 0.9rem;
  font-family: var(--mono);
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
}

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

nav a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ---------- sections ---------- */

.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type {
  border-bottom: none;
}

h2 {
  font-size: 1.4rem;
  margin: 0 0 36px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  letter-spacing: -0.01em;
}

.heading-index {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 400;
}

.theme-blurb {
  color: var(--muted);
  font-size: 0.95rem;
  margin: -20px 0 28px;
  max-width: 560px;
}

/* ---------- hero ---------- */

.hero {
  padding-top: 120px;
  padding-bottom: 96px;
}

.page-intro {
  padding-top: 64px;
  padding-bottom: 24px;
  border-bottom: none;
}

.page-title {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin: 0;
  letter-spacing: -0.02em;
}

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

.quick-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  background: var(--bg-soft);
  color: var(--text);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.quick-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  color: var(--text);
}

.quick-card .card-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.quick-card h3 {
  margin: 10px 0 8px;
  font-size: 1.1rem;
}

.quick-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.gallery-item {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-soft);
}

.gallery-item img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item figcaption {
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.kicker {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin: 0 0 18px;
  letter-spacing: -0.02em;
  min-height: 1.2em;
}

.type-target::after {
  content: "";
  display: inline-block;
  width: 3px;
  height: 0.9em;
  background: var(--accent);
  margin-left: 6px;
  animation: blink 1s step-end infinite;
  vertical-align: -0.1em;
}

@keyframes blink {
  50% { opacity: 0; }
}

.tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 40px;
  max-width: 620px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 12px 22px;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: all 0.18s ease;
  display: inline-block;
}

.btn-primary {
  background: var(--accent);
  color: #06110f;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: #06110f;
}

.btn-ghost {
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- cards / research ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px;
  background: var(--bg-soft);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-img {
  display: block;
  box-sizing: border-box;
  width: 100%;
  height: 120px;
  object-fit: contain;
  object-position: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  margin-bottom: 16px;
  background: #fff;
  padding: 10px;
}

.empty-state {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.9rem;
}

.card-tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.card h3 {
  margin: 10px 0 8px;
  font-size: 1.05rem;
}

.card p {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 0.92rem;
}

.card-link {
  font-size: 0.85rem;
  font-family: var(--mono);
  font-weight: 500;
}

/* ---------- timeline ---------- */

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--border);
}

.timeline li {
  padding: 0 0 32px 28px;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline li:last-child {
  padding-bottom: 0;
}

.timeline-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-weight: 600;
  flex-wrap: wrap;
}

.dates {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.85rem;
  font-family: var(--mono);
  white-space: nowrap;
}

.company {
  display: block;
  color: var(--accent);
  font-size: 0.88rem;
  margin: 4px 0 8px;
}

.timeline li p {
  color: var(--muted);
  margin: 0;
  font-size: 0.94rem;
}

/* ---------- publications ---------- */

.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: pub;
}

.pub-list li {
  border-left: 1px solid var(--border);
  padding: 0 0 22px 28px;
  position: relative;
  color: var(--muted);
  font-size: 0.94rem;
}

.pub-list li:last-child {
  padding-bottom: 0;
}

.pub-list li em {
  color: var(--text);
  font-style: normal;
}

.pub-status {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  margin-right: 8px;
  position: relative;
  top: -1px;
}

.pub-list li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border);
}

.pub-abstract {
  margin-top: 10px;
}

.pub-abstract summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--accent);
  list-style: none;
}

.pub-abstract summary::-webkit-details-marker {
  display: none;
}

.pub-abstract summary::before {
  content: "+ ";
}

.pub-abstract[open] summary::before {
  content: "\2212 ";
}

.pub-abstract p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- skills ---------- */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}

.skill-group h4 {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 12px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 5px 10px;
  color: var(--text);
  background: var(--bg-soft);
}

/* ---------- contact ---------- */

.links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.links a {
  font-size: 1rem;
  font-family: var(--mono);
}

.links-large a {
  font-size: 1.15rem;
}

/* ---------- footer ---------- */

.site-footer {
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-family: var(--mono);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-inner .links {
  gap: 18px;
}

.footer-inner .links a {
  font-size: 0.82rem;
}

/* ---------- reveal-on-scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .type-target::after {
    animation: none;
  }
}

@media (max-width: 600px) {
  nav a {
    margin-left: 14px;
  }
  .hero {
    padding-top: 80px;
  }
}