:root {
  --ink: #1d1e20;
  --text: #323232;
  --muted: #56585e;
  --accent: #1b52c9;
  --button: #3b5998;
  --soft: #f1f1f1;
  --dark: #1a1a1a;
  --max: 1240px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #fff;
  color: var(--text);
  font: 16px/1.6 "Roboto", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }
h1, h2, h3, h4, h5, h6 { color: var(--ink); font-weight: 600; line-height: 1.25; margin: 0 0 .6em; }
h1 { font-size: clamp(26px, 3vw, 34px); }
h2 { font-size: clamp(34px, 4.5vw, 56px); }
h3 { font-size: clamp(24px, 2.4vw, 32px); }
h4 { font-size: clamp(28px, 3vw, 40px); }
h5 { font-size: clamp(20px, 2vw, 26px); }
h6 { font-size: 18px; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }
.lead { color: var(--muted); max-width: 620px; margin: 0 auto 2em; text-align: center; }
section { padding: 56px 0; }
.soft { background: var(--soft); }
.rounded { border-radius: 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #eee;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.logo img { width: 200px; }
.nav { display: flex; gap: 28px; align-items: center; font-family: "DM Sans", sans-serif; }
.nav a { color: var(--ink); text-decoration: none; font-size: 16px; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a.active { border-bottom-color: var(--ink); }
.nav .li-icon svg { width: 18px; height: 18px; fill: var(--ink); display: block; }
.burger { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.burger span { display: block; width: 30px; height: 2px; background: var(--ink); margin: 7px 0; }

/* Home */
.about { display: grid; grid-template-columns: 1fr 1.25fr; gap: 64px; align-items: center; }
.about p { text-align: justify; font-size: 18px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split + .split { margin-top: 48px; }
.vision p { color: #0d141a; }

/* Resume */
.job { display: grid; grid-template-columns: 1fr 1.9fr; gap: 48px; align-items: start; }
.job-side { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 14px; padding-top: 70px; }
.job-side .years { font-size: 18px; font-weight: 600; color: var(--ink); }
.job-side .org { font-size: 20px; font-weight: 600; color: var(--muted); line-height: 1.35; }
.job-side .org em { font-weight: 400; font-size: 17px; color: #7f7f7f; }
.job-side .logo-img { max-height: 160px; width: auto; }
.job-side .group-img { width: 230px; }
.job h5 { color: var(--accent); }
.job ul { padding-left: 20px; margin: 0; }
.job li { margin-bottom: 10px; color: #1a1a1a; }
.job li p { margin: 0; }

/* Cards and grids */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; max-width: 1000px; margin: 0 auto; }
.cert { text-align: center; }
.cert p { margin-bottom: 10px; font-weight: 500; color: var(--ink); }
.cert img { margin: 0 auto; border-radius: 6px; box-shadow: 0 4px 16px rgba(0,0,0,.08); cursor: zoom-in; }
.single { max-width: 260px; margin: 40px auto 0; }

/* Publications */
.pubs h5 { margin-top: 1.4em; }
.pubs h6 { color: var(--accent); margin-top: 1.4em; }
.pubs ol { padding-left: 22px; }
.pubs li { margin-bottom: 4px; }
.quote { text-align: center; color: var(--accent); }
.quote h6 { color: var(--accent); margin-bottom: 4px; }

/* Projects */
.project { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; }
.project h5 { grid-column: 1 / -1; text-align: center; }
.project .imgs { display: grid; gap: 20px; }
.project img { border-radius: 12px; width: 100%; }

/* Gallery */
.year { text-align: center; margin: 0; }
.event { text-align: center; }
.event .date { color: var(--muted); margin-bottom: 24px; }
.photos { columns: 3 280px; column-gap: 16px; }
.photos img { width: 100%; margin-bottom: 16px; border-radius: 10px; cursor: zoom-in; break-inside: avoid; }
.videos { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; margin-top: 16px; }
.video { position: relative; aspect-ratio: 16 / 9; border-radius: 10px; overflow: hidden; background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video button { position: absolute; inset: 0; border: 0; padding: 0; cursor: pointer; background: #000 center / cover no-repeat; }
.video button::after { content: "▶"; position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 68px; height: 48px; border-radius: 12px; background: #e00; color: #fff; font-size: 22px; line-height: 48px; }
.video-title { font-size: 15px; color: var(--muted); margin-top: 8px; }

/* Forms */
form { display: grid; gap: 14px; }
label { font-size: 14px; font-weight: 500; color: var(--ink); display: grid; gap: 6px; }
input, textarea {
  font: inherit; font-size: 15px; padding: 12px 14px;
  border: 1px solid #cfd2d6; border-radius: 8px; background: #fff; color: var(--ink); width: 100%;
}
textarea { min-height: 140px; resize: vertical; }
.btn {
  display: inline-block; border: 0; cursor: pointer; text-decoration: none; text-align: center;
  background: var(--button); color: #fff; font: 500 16px "Roboto", sans-serif;
  padding: 14px 28px; border-radius: 50px; transition: filter .2s;
}
.btn:hover { filter: brightness(1.15); }
.form-note { font-size: 14px; color: var(--muted); }
.cv-box { max-width: 420px; margin: 0 auto; }
.cv-box .btn { justify-self: center; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.card-link img { border-radius: 12px; margin-top: 12px; }
.info-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 40px; align-items: start; }
.map { width: 100%; aspect-ratio: 4 / 3; border: 0; border-radius: 12px; }

/* Legal */
.legal { max-width: 860px; }
.legal h2 { font-size: 26px; margin-top: 1.6em; }
.legal h3 { font-size: 20px; margin-top: 1.2em; }

/* Footer */
.site-footer { background: var(--dark); color: #fff; padding: 64px 0 48px; }
.site-footer a, .site-footer h5, .site-footer h6, .site-footer p { color: #fff; }
.foot { display: grid; grid-template-columns: 1fr 260px 380px; gap: 40px; }
.foot .small { font-size: 14px; }
.socials { display: flex; gap: 16px; margin: 16px 0; }
.socials svg { width: 24px; height: 24px; fill: #fff; }
.legal-links a { display: block; font-weight: 600; font-size: 18px; margin-bottom: 12px; }
.site-footer input { background: #fff; }

/* Lightbox */
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.9); display: none; align-items: center; justify-content: center; z-index: 100; padding: 24px; cursor: zoom-out; }
.lightbox.open { display: flex; }
.lightbox img { max-height: 92vh; max-width: 96vw; border-radius: 6px; }

/* Reveal animations (only when JS runs, so content never stays hidden) */
:root { --ease-out: cubic-bezier(.22, 1, .36, 1); }
.js .reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity .8s var(--ease-out), transform .9s var(--ease-out), filter .9s var(--ease-out);
  transition-delay: var(--d, 0s);
}
.js .reveal.from-left { transform: translateX(-56px); }
.js .reveal.from-right { transform: translateX(56px); }
.js img.reveal, .js .reveal.pop { transform: translateY(32px) scale(.94); filter: blur(4px); }
.js img.reveal.from-left { transform: translateX(-56px) scale(.96); }
.js img.reveal.from-right { transform: translateX(56px) scale(.96); }
.js .reveal.in, .js img.reveal.in { opacity: 1; transform: none; filter: none; }

/* Headings get an accent line that draws in */
.js h2.reveal::after, .js h3.reveal::after {
  content: ""; display: block; width: 64px; height: 3px; margin-top: 14px;
  background: var(--accent); border-radius: 3px;
  transform: scaleX(0); transform-origin: left; transition: transform .8s var(--ease-out) .35s;
}
.js .center h2.reveal::after, .js .event h3.reveal::after, .js h2.year.reveal::after { margin-left: auto; margin-right: auto; transform-origin: center; }
.js h2.reveal.in::after, .js h3.reveal.in::after { transform: scaleX(1); }

/* Scroll progress bar */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 60;
  background: linear-gradient(90deg, var(--accent), #5b8cff);
  transform: scaleX(0); transform-origin: left; pointer-events: none;
}

/* Header reacts to scrolling */
.site-header .wrap { transition: height .3s ease; }
.site-header { transition: box-shadow .3s ease; }
.site-header.scrolled { box-shadow: 0 6px 24px rgba(0,0,0,.08); }
.site-header.scrolled .wrap { height: 62px; }
.logo img { transition: width .3s ease; }
.site-header.scrolled .logo img { width: 170px; }

/* Animated nav underline */
.nav a { border-bottom: 0; position: relative; }
.nav a:not(.li-icon)::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--ink);
  transform: scaleX(0); transform-origin: right; transition: transform .3s ease;
}
.nav a:hover::after, .nav a.active::after { transform: scaleX(1); transform-origin: left; }

/* Hover lift on images and cards */
.cert img, .photos img, .project img, .card-link img, .video {
  transition: transform .45s var(--ease-out), box-shadow .45s var(--ease-out);
}
.cert img:hover, .photos img:hover, .project img:hover, .card-link img:hover, .video:hover {
  transform: translateY(-6px); box-shadow: 0 18px 40px rgba(0,0,0,.16);
}
.btn { transition: filter .2s, transform .25s var(--ease-out), box-shadow .25s; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(59,89,152,.35); }

/* Parallax images */
.parallax { will-change: transform; }

/* Back to top */
.to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 40; width: 46px; height: 46px; border-radius: 50%;
  border: 0; cursor: pointer; background: var(--ink); color: #fff; font-size: 20px; line-height: 46px;
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
  opacity: 0; transform: translateY(16px); pointer-events: none; transition: opacity .3s, transform .3s var(--ease-out);
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--accent); }

/* Lightbox fade */
.lightbox { display: flex; opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s; }
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox img { transform: scale(.92); transition: transform .35s var(--ease-out); }
.lightbox.open img { transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .js img.reveal { opacity: 1; transform: none; filter: none; transition: none; }
  .js h2.reveal::after, .js h3.reveal::after { transform: none; transition: none; }
  .parallax { transform: none !important; }
  .progress { display: none; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

/* Mobile */
@media (max-width: 920px) {
  .burger { display: block; }
  .nav {
    position: absolute; top: 100%; left: 0; right: 0; background: #fff;
    flex-direction: column; align-items: flex-start; gap: 0; padding: 8px 24px 20px;
    border-bottom: 1px solid #eee; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 10px 0; font-size: 18px; }
  .about, .split, .job, .project, .contact-grid, .info-grid, .foot { grid-template-columns: 1fr; gap: 28px; }
  .job-side { padding-top: 0; }
  .split.flip > :first-child { order: 2; }
  section { padding: 40px 0; }
  .logo img { width: 170px; }
  .js .reveal.from-left:not(.in), .js .reveal.from-right:not(.in) { transform: translateY(40px); }
}
main { overflow-x: clip; }