:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --ink: #0b1728;
  --muted: #526072;
  --faint: #8290a2;
  --line: #d9e2ed;
  --accent: #1769e0;
  --accent-2: #36b2ff;
  --accent-soft: #e7f1ff;
  --navy: #0b2f5b;
  --glow: rgba(23, 105, 224, 0.18);
  --max: 1180px;
  --header-h: 72px;
}

[data-theme="dark"] {
  --bg: #07111f;
  --surface: #0d1929;
  --ink: #f1f6fc;
  --muted: #aebccd;
  --faint: #73859a;
  --line: #213147;
  --accent: #62a6ff;
  --accent-2: #48d1ff;
  --accent-soft: #102949;
  --navy: #a6ccff;
  --glow: rgba(50, 149, 255, 0.2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 24px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  transition: background-color 180ms ease, color 180ms ease;
}
a { color: inherit; text-decoration-color: color-mix(in srgb, var(--accent) 60%, transparent); text-underline-offset: 4px; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 999; top: 8px; left: 8px; padding: 10px 14px; background: var(--ink); color: var(--bg); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled { border-color: var(--line); }
.brand { display: inline-flex; align-items: center; gap: 11px; width: fit-content; text-decoration: none; font-weight: 720; letter-spacing: -0.02em; }
.brand-mark { display: grid; place-items: center; width: 35px; height: 35px; background: var(--ink); color: var(--bg); border-radius: 50%; font-size: .7rem; letter-spacing: .05em; }
.desktop-nav { display: flex; gap: 30px; font-size: .86rem; font-weight: 650; color: var(--muted); }
.desktop-nav a { text-decoration: none; }
.desktop-nav a:hover { color: var(--accent); }
.header-actions { justify-self: end; display: flex; align-items: center; gap: 10px; }
.theme-toggle, .menu-toggle { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 50%; cursor: pointer; }
.menu-toggle { display: none; gap: 5px; align-content: center; }
.menu-toggle span:not(.sr-only) { display: block; width: 16px; height: 1.5px; background: currentColor; }
.mobile-nav { display: none; }

main { overflow: hidden; }
.hero {
  max-width: var(--max);
  min-height: min(820px, calc(100svh - var(--header-h)));
  margin: 0 auto;
  padding: clamp(72px, 9vw, 120px) 28px 96px;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(300px, .72fr);
  gap: 72px;
  align-items: center;
}
.eyebrow { margin: 0 0 16px; color: var(--accent); font-size: .82rem; font-weight: 760; letter-spacing: .12em; text-transform: uppercase; }
.contact .eyebrow span { display: inline-block; width: 22px; height: 2px; margin: 0 10px 3px 0; background: var(--accent-2); }
.hero h1 {
  margin: 0;
  font-family: "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(3.25rem, 6vw, 5.15rem);
  line-height: 1.02;
  letter-spacing: -.045em;
  font-weight: 680;
}
.hero-lede { max-width: 720px; margin: 28px 0 18px; font-size: clamp(1.28rem, 2.2vw, 1.72rem); line-height: 1.42; letter-spacing: -.025em; }
.hero-intro { max-width: 680px; margin: 0; color: var(--muted); font-size: 1rem; }
.hero-intro a { font-weight: 650; }
.hero-cta { display: flex; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 47px; padding: 0 20px; border-radius: 999px; text-decoration: none; font-size: .88rem; font-weight: 750; border: 1px solid var(--line); }
.button-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.button-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.button-quiet { background: var(--surface); }
.button-quiet:hover { border-color: var(--accent); color: var(--accent); }

.hero-links { display: flex; gap: 22px; margin-top: 28px; }
.hero-links a { color: var(--muted); font-size: .84rem; font-weight: 700; text-decoration-thickness: 1px; }
.hero-links a:hover { color: var(--accent); }
.portrait { width: min(100%, 390px); margin: 0; justify-self: end; }
.profile-photo { display: block; width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; border: 1px solid var(--line); border-radius: 28px; }

.section { max-width: var(--max); margin: 0 auto; padding: 112px 28px; display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 56px; border-top: 1px solid var(--line); }
.section-label { color: var(--faint); font-size: .73rem; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.recent-news { padding-top: 48px; padding-bottom: 48px; }
.news-list { border-top: 1px solid var(--line); }
.news-item { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 24px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.news-meta { display: flex; align-items: baseline; gap: 12px; color: var(--faint); font: 650 .7rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.news-meta span { color: var(--accent); font-weight: 760; }
.news-item p { margin: 0; color: var(--muted); line-height: 1.55; }
.news-item strong { color: var(--ink); }
.news-item a { color: var(--ink); text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.news-item a:hover { color: var(--accent); }
.split-intro { display: grid; grid-template-columns: 1fr; gap: 30px; align-items: start; }
.split-intro h2 { max-width: 900px; margin: 0; font-size: clamp(2.3rem, 5.2vw, 4.5rem); line-height: 1.02; letter-spacing: -.06em; text-wrap: balance; }
.split-intro p { max-width: 780px; margin: 0; color: var(--muted); }

.paper { position: relative; display: grid; grid-template-columns: 50px minmax(0, 1fr); gap: 22px; padding: 34px 0; border-top: 1px solid var(--line); }
.paper:last-child { border-bottom: 1px solid var(--line); }
.paper-index { padding-top: 4px; color: var(--faint); font: 600 .72rem/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.paper-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--faint); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; }
.status { display: inline-flex; align-items: center; min-height: 25px; padding: 0 9px; border: 1px solid var(--line); border-radius: 999px; font-weight: 760; }
.status.accepted { background: var(--accent); border-color: var(--accent); color: #fff; }
.status.preprint { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); background: var(--accent-soft); }
.paper h3 { max-width: 880px; margin: 14px 0 12px; font-size: clamp(1.35rem, 2.6vw, 2.05rem); line-height: 1.18; letter-spacing: -.035em; }
.authors, .paper-summary { margin: 0; color: var(--muted); }
.paper-summary { max-width: 800px; margin-top: 13px; }
.paper-links { display: flex; gap: 20px; margin-top: 18px; }
.paper-links a { color: var(--accent); font-size: .82rem; font-weight: 780; text-decoration-thickness: 1.5px; }

.section-heading-row { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(240px, .75fr); gap: 48px; align-items: end; margin-bottom: 48px; }
.section-heading-row h2 { max-width: 760px; margin: 0; font-size: clamp(2.25rem, 4.8vw, 4rem); line-height: 1.04; letter-spacing: -.055em; }
.section-heading-row p { margin: 0 0 6px; color: var(--muted); }

.timeline { border-top: 1px solid var(--line); }
.timeline-item { display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: 36px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.timeline-date { color: var(--faint); font: 650 .73rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.timeline-org { margin: 0 0 3px; color: var(--accent); font-size: .76rem; font-weight: 780; letter-spacing: .1em; text-transform: uppercase; }
.timeline-content h3 { margin: 0; font-size: 1.25rem; letter-spacing: -.025em; }
.timeline-content h3 span { margin-left: 7px; color: var(--faint); font-size: .8rem; font-weight: 550; letter-spacing: 0; }
.timeline-content > p:last-child { max-width: 820px; margin: 10px 0 0; color: var(--muted); }

.project-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.project-card { min-height: 430px; display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); }
.project-featured { background: var(--ink); color: var(--bg); }
.project-top { display: flex; justify-content: space-between; gap: 16px; color: var(--faint); font-size: .71rem; letter-spacing: .08em; text-transform: uppercase; }
.project-featured .project-top { color: color-mix(in srgb, var(--bg) 60%, transparent); }
.project-type { font-weight: 800; }
.project-card h3 { margin: auto 0 14px; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1; letter-spacing: -.06em; }
.project-featured h3 { color: var(--accent-2); font-size: clamp(3rem, 6vw, 5.5rem); }
.project-card p { margin: 0 0 24px; color: var(--muted); }
.project-featured p { color: color-mix(in srgb, var(--bg) 72%, transparent); }
.project-card a { width: fit-content; color: var(--accent); font-size: .82rem; font-weight: 780; }
.project-featured a { color: var(--accent-2); }
.project-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 0 0 24px; }
.project-stat { width: auto !important; min-height: 88px; display: flex; flex-direction: column; justify-content: center; padding: 13px 15px; border: 1px solid var(--line); border-radius: 15px; background: var(--bg); text-decoration: none; }
.project-stat strong { color: var(--ink); font-size: 1.35rem; line-height: 1.15; letter-spacing: -.035em; }
.project-stat span { margin-top: 4px; color: var(--faint); font-size: .68rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.project-stat:hover { border-color: var(--accent); }

.profile-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 70px; }
.profile-grid h2 { margin: 0 0 30px; font-size: 2.1rem; letter-spacing: -.045em; }
.education-block article, .activity-block article { padding: 23px 0; border-top: 1px solid var(--line); }
.education-block article:last-child, .activity-block article:last-child { border-bottom: 1px solid var(--line); }
.education-block article > div { display: flex; justify-content: space-between; gap: 16px; }
.education-block article span, .activity-block article > span { color: var(--faint); font: 650 .7rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.education-block p, .activity-block p { margin: 8px 0 0; }
.education-block small { display: block; margin-top: 6px; color: var(--muted); font-size: .82rem; }
.activity-block article { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 18px; }
.activity-block p { margin: 0; color: var(--muted); }
.activity-block strong { color: var(--ink); }

.contact { padding: 120px 28px; background: var(--ink); color: var(--bg); }
.contact-inner { max-width: calc(var(--max) - 56px); margin: 0 auto; }
.contact h2 { margin: 0; font-size: clamp(3rem, 8vw, 7.8rem); line-height: .92; letter-spacing: -.075em; }
.contact h2 em { color: var(--accent-2); font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
.contact-email { display: inline-block; margin-top: 48px; color: var(--bg); font-size: clamp(1.25rem, 3vw, 2.2rem); font-weight: 720; text-decoration-color: var(--accent-2); }
.contact-links { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 50px; }
.contact-links a { color: color-mix(in srgb, var(--bg) 68%, transparent); font-size: .84rem; font-weight: 700; text-decoration: none; }
.contact-links a:hover { color: var(--accent-2); }
.site-footer { max-width: var(--max); margin: 0 auto; padding: 30px 28px 48px; display: flex; justify-content: space-between; gap: 20px; color: var(--faint); font-size: .75rem; }
.site-footer a { color: var(--accent); font-weight: 700; }

.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 600ms ease, transform 600ms ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 860px) {
  .site-header { grid-template-columns: 1fr auto; padding-inline: 20px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: grid; }
  .mobile-nav { position: absolute; top: calc(100% + 1px); left: 20px; right: 20px; padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 20px 50px rgba(0,0,0,.12); }
  .mobile-nav.open { display: grid; }
  .mobile-nav a { padding: 11px 12px; text-decoration: none; font-weight: 700; }
  .brand-name { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-inline: 20px; padding-top: 72px; }
  .portrait { width: min(100%, 360px); justify-self: start; }
  .section { padding: 82px 20px; grid-template-columns: 1fr; gap: 28px; }
  .recent-news { padding-top: 42px; padding-bottom: 42px; }
  .news-item { grid-template-columns: 1fr; gap: 8px; }
  .split-intro { grid-template-columns: 1fr; gap: 24px; }
  .section-heading-row, .profile-grid { grid-template-columns: 1fr; gap: 24px; }
  .timeline-item { grid-template-columns: 1fr; gap: 10px; }
  .project-grid { grid-template-columns: 1fr; }
  .project-card { min-height: 360px; }
  .site-footer { flex-direction: column; }
}

@media (max-width: 520px) {
  .hero h1 { font-size: clamp(3rem, 14vw, 4.25rem); }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-links { flex-wrap: wrap; }
  .portrait { width: 100%; }
  .paper { grid-template-columns: 32px minmax(0, 1fr); gap: 12px; }
  .project-stats { grid-template-columns: 1fr; }
  .education-block article > div { display: grid; gap: 5px; }
  .activity-block article { grid-template-columns: 1fr; gap: 8px; }
  .contact { padding: 90px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}