:root {
  --bg: #fafafa;
  --bg-raised: #f2f1ee;
  --card: #ffffff;
  --fg: #1a1a1a;
  --fg-dim: rgba(26, 26, 26, 0.66);
  --fg-faint: rgba(26, 26, 26, 0.42);
  --accent: #3f8f3f;
  --accent-dim: #6a9a5a;
  --line: rgba(26, 26, 26, 0.12);
  --line-strong: rgba(26, 26, 26, 0.85);
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter Tight", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --max: min(1560px, 94vw);
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  background-image: radial-gradient(rgba(26, 26, 26, 0.09) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--mono); letter-spacing: 0.02em; }

a { color: inherit; }

/* scroll-reveal */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

/* header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 56px);
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fg);
}

.brand-mark { width: 26px; height: 26px; }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-text .name { font-weight: 600; font-size: 1rem; }

.brand-text .place { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; color: var(--fg-faint); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--fg-dim);
  font-family: var(--mono);
  letter-spacing: 0.03em;
  transition: color 0.15s ease;
}

.site-nav a:hover { color: var(--fg); }

.pill-btn {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 9px 18px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--fg);
  background: transparent;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.pill-btn:hover { background: var(--fg); color: var(--bg); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--fg);
}

/* layout */

main { max-width: var(--max); margin: 0 auto; padding: 0 clamp(20px, 5vw, 56px); }

.section { padding: 64px 0; border-top: 1px solid var(--line); }

.kicker { color: var(--accent); font-size: 0.8rem; margin: 0 0 14px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; margin: 0; }

h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); margin-bottom: 14px; }

.section-intro { color: var(--fg-dim); max-width: 640px; margin: 0 0 32px; }

/* hero */

.hero { padding: 72px 0 64px; position: relative; }

.hero-text { min-width: 0; position: relative; z-index: 1; }

/* hero robot illustration — same construction as buitienson.com's hero-robot:
   a full-bleed SVG behind the hero text, procedurally drawn in JS each frame.
   Monochrome ink at low opacity for the arm; only the gripper carries color. */

.hero-bot {
  display: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

@media (min-width: 1100px) {
  .hero-bot { display: block; }
}

.rb-base-shadow { fill: var(--fg); opacity: 0.1; }

.rb-base { fill: var(--fg); stroke: var(--fg); stroke-width: 1; opacity: 0.16; }

.rb-base-top { fill: var(--fg); stroke: var(--fg); stroke-width: 1; opacity: 0.12; }

.rb-block { fill: var(--fg); stroke: var(--fg); stroke-width: 1; opacity: 0.17; }

.rb-beam { fill: var(--fg); stroke: var(--fg); stroke-width: 1; opacity: 0.22; stroke-linejoin: round; }

.rb-truss {
  fill: none; stroke: var(--fg); stroke-width: 3; opacity: 0.26;
  stroke-dasharray: 2, 11; stroke-linecap: round;
}

.rb-servo { fill: var(--bg); stroke: var(--fg); stroke-width: 4; opacity: 0.42; }

.rb-servo-i { fill: var(--fg); opacity: 0.2; }

.rb-grip-core { fill: #f3f0e8; stroke: var(--fg); stroke-width: 2; opacity: 0.7; }

.rb-petal { fill: #c91d1d; stroke: #8c1212; stroke-width: 1.2; opacity: 0.68; stroke-linejoin: round; }

@media (min-width: 1100px) {
  .hero {
    display: flex;
    align-items: center;
    gap: clamp(56px, 7vw, 110px);
  }
  .hero-text { flex: 0 1 auto; }
  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 32px;
    flex-shrink: 0;
    padding-left: clamp(40px, 4vw, 64px);
    border-left: 1px solid var(--line);
  }
  .hero-stats .num { font-size: 2.3rem; }
}

.hero .metaline { color: var(--fg-dim); font-size: 0.78rem; margin: 0 0 28px; display: flex; align-items: center; gap: 8px; }

.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); display: inline-block;
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  line-height: 1.02;
  margin-bottom: 28px;
  max-width: 16ch;
  letter-spacing: -0.01em;
}

.lede { font-size: 1.15rem; color: var(--fg-dim); max-width: 58ch; margin-bottom: 40px; }

.hero-stats, .flagship-stats {
  display: flex;
  gap: clamp(28px, 6vw, 64px);
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-stats .num, .flagship-stats .num {
  display: block;
  font-size: 2rem;
  color: var(--fg);
  font-family: var(--serif);
}

.hero-stats .lbl, .flagship-stats .lbl {
  display: block;
  font-size: 0.72rem;
  color: var(--fg-faint);
  margin-top: 4px;
  font-family: var(--mono);
}

/* research grid */

.research-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }

.research-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; }

.research-card .tag { color: var(--accent); font-size: 0.78rem; margin-bottom: 10px; display: block; font-family: var(--mono); }

.research-card h3 { font-size: 1.2rem; margin-bottom: 10px; }

.research-card p { color: var(--fg-dim); font-size: 0.95rem; margin: 0 0 16px; }

.research-card .stats { display: flex; gap: 18px; flex-wrap: wrap; }

.research-card .stats div { font-size: 0.72rem; color: var(--fg-faint); }

.research-card .stats b { display: block; color: var(--fg); font-size: 0.95rem; font-family: var(--mono); font-weight: 500; }

/* flagship */

.flagship { background: var(--bg-raised); margin: 0 calc(-1 * clamp(20px, 5vw, 56px)); padding: 64px clamp(20px, 5vw, 56px); }

.flagship-media { margin-top: 40px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }

.flagship-media img { display: block; width: 100%; height: auto; }

/* projects */

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

.project-card {
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--card); text-decoration: none; color: inherit; display: block;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  width: 100%; text-align: left; padding: 0; font: inherit; cursor: default;
}

button.project-card { cursor: pointer; }

.project-card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(26, 26, 26, 0.08); }

.project-card.flagship-tag { border-color: var(--accent); }

.project-media {
  aspect-ratio: 16 / 10; position: relative; background: linear-gradient(135deg, #f0f0f0, #e6e6e6);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}

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

.project-media .letter { font-family: var(--serif); font-size: 3.4rem; color: var(--fg-faint); }

.project-media .play {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.12); opacity: 0; transition: opacity 0.2s ease;
}

.project-card:hover .project-media .play { opacity: 1; }

.project-media .play svg { width: 46px; height: 46px; filter: drop-shadow(0 2px 6px rgba(0,0,0,.4)); }

.project-body { padding: 20px 22px 24px; }

.project-card .idx { font-family: var(--mono); color: var(--fg-faint); font-size: 0.72rem; display: block; margin-bottom: 10px; }

.project-card h3 { font-size: 1.02rem; margin-bottom: 8px; line-height: 1.3; }

.project-card p { color: var(--fg-dim); font-size: 0.88rem; margin: 0; }

/* PI */

.pi-block { display: flex; gap: 40px; align-items: flex-start; }

.pi-portrait {
  width: 140px; height: 140px; object-fit: cover; border-radius: var(--radius);
  border: 1px solid var(--line); flex-shrink: 0;
}

.pi-text p { color: var(--fg-dim); max-width: 68ch; }

.pi-role { color: var(--accent); margin-bottom: 18px; }

@media (max-width: 600px) {
  .pi-block { flex-direction: column; gap: 24px; }
  .pi-portrait { width: 96px; height: 96px; }
}

.link { text-decoration: none; color: var(--accent); font-size: 0.9rem; }

.link:hover { text-decoration: underline; }

/* publications */

.pub-list { display: block; }

.pub-item { display: grid; grid-template-columns: 100px 1fr; gap: 20px; padding: 18px 0; border-top: 1px solid var(--line); break-inside: avoid; }

.pub-item:first-child { border-top: none; }

@media (min-width: 900px) {
  .pub-list { column-count: 2; column-gap: 52px; }
  .pub-item { padding: 16px 0; }
}

@media (min-width: 1500px) {
  .pub-list { column-count: 3; }
}

.pub-item .pub-meta { font-size: 0.85rem; color: var(--fg-faint); font-family: var(--mono); display: flex; flex-direction: column; gap: 8px; }

.pub-item .pub-meta .tier {
  align-self: flex-start; font-size: 0.64rem; color: var(--accent);
  border: 1px solid var(--accent); border-radius: 999px; padding: 2px 9px;
}

.pub-item h3 { font-size: 1rem; font-family: var(--sans); font-weight: 600; margin: 0 0 6px; line-height: 1.4; }

.pub-item h3 a { color: var(--fg); text-decoration: none; }

.pub-item h3 a:hover { color: var(--accent); text-decoration: underline; }

.pub-item .authors { color: var(--fg-dim); font-size: 0.85rem; margin: 0 0 4px; }

.pub-item .where { color: var(--fg-faint); font-size: 0.82rem; margin: 0; }

.pub-item .where .hl { color: var(--accent); }

.pub-item.hidden { display: none; }

/* patents */

.patents-list { display: block; }

.patent-item { padding: 18px 0; border-top: 1px solid var(--line); break-inside: avoid; }

.patent-item:first-child { border-top: none; }

@media (min-width: 900px) {
  .patents-list { column-count: 2; column-gap: 52px; }
}

@media (min-width: 1500px) {
  .patents-list { column-count: 3; }
}

.patent-item h3 { font-size: 1rem; font-family: var(--sans); font-weight: 600; margin: 0 0 6px; }

.patent-item h3 a { color: var(--fg); text-decoration: none; }

.patent-item h3 a:hover { color: var(--accent); text-decoration: underline; }

.patent-item .office { color: var(--fg-faint); font-size: 0.75rem; margin: 0 0 4px; }

.patent-item .status { color: var(--fg-dim); font-size: 0.85rem; margin: 0; }

.btn {
  margin-top: 30px;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--fg);
  padding: 12px 22px;
  font-size: 0.78rem;
  font-family: var(--mono);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn:hover { background: var(--fg); color: var(--bg); }

/* team */

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

.team-card { padding: 20px 0; }

.team-card .avatar {
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--bg-raised); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 0.75rem; color: var(--accent);
  margin-bottom: 14px;
}

.team-card .avatar.photo { object-fit: cover; }

.team-card h3 { font-size: 1rem; margin-bottom: 4px; }

.team-card .role { color: var(--fg-faint); font-size: 0.78rem; margin: 0 0 10px; }

.team-card .tag {
  display: inline-block; font-family: var(--mono); font-size: 0.64rem;
  color: var(--accent); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px;
  margin-bottom: 10px;
}

.team-card p { color: var(--fg-dim); font-size: 0.85rem; margin: 0; }

/* news */

.news-list { display: block; }

.news-item { display: grid; grid-template-columns: 110px 100px 1fr; gap: 16px; padding: 14px 0; border-top: 1px solid var(--line); align-items: baseline; break-inside: avoid; }

.news-item:first-child { border-top: none; }

@media (min-width: 1100px) {
  .news-list { column-count: 2; column-gap: 52px; }
  .news-item { grid-template-columns: 100px 90px 1fr; }
}

.news-item .date { font-family: var(--mono); font-size: 0.75rem; color: var(--fg-faint); }

.news-item .tag { font-family: var(--mono); font-size: 0.66rem; color: var(--accent); text-transform: uppercase; }

.news-item .body-wrap { display: flex; flex-direction: column; gap: 12px; }

.news-item .body { font-size: 0.92rem; color: var(--fg-dim); }

.news-item .news-photo { width: 100%; max-width: 360px; border-radius: 12px; border: 1px solid var(--line); }

/* honors */

.honors-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }

.honors-grid h3 { font-size: 0.85rem; color: var(--fg-faint); margin-bottom: 18px; text-transform: uppercase; font-family: var(--mono); font-weight: 500; }

.honors-list, .service-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }

.honors-list li, .service-list li { color: var(--fg-dim); font-size: 0.9rem; line-height: 1.5; }

.honors-list li b, .service-list li b {
  font-family: var(--mono); color: var(--accent); font-weight: 500; font-size: 0.85rem;
}

.honors-list li a, .service-list li a { color: var(--fg); text-decoration: none; }

.honors-list li a:hover, .service-list li a:hover { color: var(--accent); text-decoration: underline; }

.honors-list li .where { display: block; color: var(--fg-faint); font-size: 0.82rem; margin-top: 2px; }

.reviewer-for { margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--fg-dim); font-size: 0.85rem; line-height: 1.6; }

.reviewer-for b { font-family: var(--mono); color: var(--fg); font-weight: 500; display: block; margin-bottom: 6px; }

/* contact */

.contact-links { display: flex; gap: 16px; flex-wrap: wrap; }

.contact-links .pill-btn { font-size: 0.8rem; padding: 12px 22px; }

/* lightbox */

.lightbox {
  position: fixed; inset: 0; background: rgba(10, 10, 8, 0.86);
  display: flex; align-items: center; justify-content: center; z-index: 200;
  padding: 24px;
}

.lightbox[hidden] { display: none; }

.lightbox-inner { width: min(900px, 100%); aspect-ratio: 16/9; position: relative; }

.lightbox-inner iframe { width: 100%; height: 100%; border: 0; border-radius: 10px; }

.lightbox-close {
  position: absolute; top: -44px; right: 0; background: none; border: none;
  color: #fff; font-family: var(--mono); font-size: 0.8rem; cursor: pointer;
}

/* footer */

.site-footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding: 32px clamp(20px, 5vw, 56px) 56px;
  color: var(--fg-faint); font-size: 0.75rem;
  max-width: var(--max); margin: 0 auto;
}

.site-footer a { text-decoration: none; color: var(--fg-faint); }

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

/* responsive */

@media (max-width: 780px) {
  .site-nav { display: none; }
  .nav-toggle { display: flex; }
  .honors-grid { grid-template-columns: 1fr; gap: 36px; }
  .pub-item { grid-template-columns: 1fr; gap: 6px; }
  .news-item { grid-template-columns: 1fr; gap: 4px; }
}

@media (max-width: 780px) {
  .site-header.open .site-nav {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    padding: 20px clamp(20px, 5vw, 56px) 28px;
    border-bottom: 1px solid var(--line);
    gap: 16px;
  }
}