:root {
  --green: #31521b;
  --green-deep: #263f16;
  --green-soft: #708f37;
  --green-pale: #eef3e8;
  --ink: #171a16;
  --muted: #62675f;
  --paper: #ffffff;
  --soft: #f5f6f2;
  --line: rgba(49, 82, 27, 0.18);
  --shadow: 0 24px 70px rgba(20, 34, 12, 0.12);
  --radius-lg: 30px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --container: 1180px;
  --font: "Franklin Gothic Book", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--ink);
  color: white;
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.section { position: relative; padding: 110px 0; }
.section-soft { background: var(--soft); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(49, 82, 27, 0.1);
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 10px 10px 10px 2px;
  background: var(--green);
  color: white;
  font-weight: 700;
  letter-spacing: .04em;
}
.brand-text { display: grid; line-height: 1.05; }
.brand-text strong { font-size: .9rem; text-transform: uppercase; letter-spacing: .06em; }
.brand-text span { margin-top: 4px; color: var(--muted); font-size: .83rem; }

.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 9px 11px;
  border-radius: 10px;
  color: #3c413a;
  font-size: .88rem;
  text-decoration: none;
  transition: background .25s ease, color .25s ease;
}
.nav-links a:hover,
.nav-links a.is-active { background: var(--green-pale); color: var(--green-deep); }

.menu-toggle { display: none; width: 44px; height: 44px; border: 0; border-radius: 12px; background: var(--green-pale); cursor: pointer; }
.menu-toggle span { display: block; width: 21px; height: 2px; margin: 5px auto; background: var(--green); transition: .25s ease; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero { min-height: 780px; display: flex; align-items: center; overflow: hidden; padding-top: 96px; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(49,82,27,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(49,82,27,.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 80%);
  pointer-events: none;
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(1px); opacity: .45; pointer-events: none; }
.hero-glow-one { width: 420px; height: 420px; right: -130px; top: 50px; background: radial-gradient(circle, rgba(112,143,55,.25), rgba(112,143,55,0)); }
.hero-glow-two { width: 380px; height: 380px; left: -190px; bottom: -40px; background: radial-gradient(circle, rgba(49,82,27,.15), rgba(49,82,27,0)); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 80px; }
.eyebrow { margin: 0 0 14px; color: var(--green-soft); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .18em; }
.hero h1 { margin: 0; max-width: 760px; font-size: clamp(3.35rem, 6vw, 6.4rem); line-height: .9; letter-spacing: -.045em; text-transform: uppercase; }
.hero h1 span { color: var(--green); }
.hero-lead { max-width: 660px; margin: 28px 0 0; color: #4e544b; font-size: clamp(1.05rem, 2vw, 1.28rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { border-color: var(--green); background: var(--green); color: white; box-shadow: 0 10px 26px rgba(49,82,27,.2); }
.btn-primary:hover { background: var(--green-deep); }
.btn-secondary { background: white; color: var(--green-deep); }

.research-strip { display: grid; grid-template-columns: max-content 1fr 1fr; gap: 16px; align-items: center; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); color: #545a51; font-size: .82rem; }
.research-label { color: var(--green); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }

.hero-visual { display: flex; justify-content: center; }
.portrait-frame { position: relative; width: min(100%, 430px); padding: 26px; border: 1px solid rgba(49,82,27,.18); border-radius: 38px 38px 38px 8px; background: linear-gradient(145deg, white, var(--green-pale)); box-shadow: var(--shadow); }
.portrait-frame::before { content: ""; position: absolute; inset: 16px; border: 1px solid rgba(49,82,27,.14); border-radius: 28px 28px 28px 5px; pointer-events: none; }
.portrait-frame img { position: relative; z-index: 1; width: 100%; height: auto; object-fit: contain; border-radius: 24px 24px 24px 4px; }
.portrait-accent { position: absolute; z-index: 2; width: 88px; height: 88px; top: -18px; right: -18px; border-radius: 0 32px 0 32px; background: var(--green); box-shadow: 0 16px 32px rgba(49,82,27,.22); }
.portrait-caption { position: absolute; z-index: 3; left: -36px; bottom: 28px; display: grid; gap: 3px; max-width: 250px; padding: 14px 18px; border: 1px solid rgba(255,255,255,.65); border-radius: 14px; background: rgba(255,255,255,.92); backdrop-filter: blur(12px); box-shadow: 0 14px 36px rgba(20,34,12,.14); }
.portrait-caption span { color: var(--muted); font-size: .8rem; }
.portrait-caption strong { color: var(--green); }

.two-column { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; align-items: center; }
.section-heading { max-width: 650px; }
.section-heading.centered { margin: 0 auto 56px; text-align: center; }
.section-heading h2 { margin: 0; font-size: clamp(2.3rem, 4vw, 4.2rem); line-height: 1; letter-spacing: -.035em; }
.section-heading > p:not(.eyebrow) { margin: 22px 0 0; color: var(--muted); font-size: 1.06rem; }
.section-heading.light h2 { color: white; }
.section-heading.light .eyebrow { color: #cddbbd; }

.profile-panel { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: white; box-shadow: 0 18px 52px rgba(20,34,12,.07); }
.panel-kicker { padding: 2px 2px 18px; color: var(--green); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .13em; }
.research-card { display: grid; grid-template-columns: 56px 1fr; gap: 18px; align-items: start; padding: 22px 0; border-top: 1px solid var(--line); }
.research-number { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--green-pale); color: var(--green); font-weight: 700; }
.research-card p { margin: 7px 0 0; font-size: 1.08rem; }

.timeline { position: relative; max-width: 980px; margin: 0 auto; }
.timeline::before { content: ""; position: absolute; left: 96px; top: 6px; bottom: 6px; width: 1px; background: linear-gradient(var(--green-soft), rgba(112,143,55,.12)); }
.timeline-item { position: relative; display: grid; grid-template-columns: 160px 1fr; min-height: 130px; padding: 18px 0 28px; }
.timeline-item::before { content: ""; position: absolute; top: 31px; left: 90px; width: 13px; height: 13px; border: 4px solid white; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 1px var(--green-soft); }
.timeline-year { padding-top: 1px; color: var(--green); font-size: 1.7rem; font-weight: 700; letter-spacing: -.02em; }
.timeline-content { padding: 0 0 30px 34px; border-bottom: 1px solid rgba(49,82,27,.11); }
.timeline-content h3 { margin: 0; font-size: 1.3rem; }
.timeline-content p { margin: 6px 0 0; color: var(--muted); }
.career-note { display: grid; grid-template-columns: 54px 1fr; gap: 18px; max-width: 980px; margin: 36px auto 0; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--green-pale); }
.career-icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--green); color: white; font-size: 1.25rem; }
.career-note p { margin: 3px 0 0; }

.section-green { overflow: hidden; background: var(--green); }
.section-green::after { content: ""; position: absolute; width: 460px; height: 460px; right: -120px; top: -160px; border: 1px solid rgba(255,255,255,.13); border-radius: 50%; box-shadow: 0 0 0 80px rgba(255,255,255,.025), 0 0 0 160px rgba(255,255,255,.018); }
.course-grid { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 44px; }
.course-card { min-height: 210px; padding: 24px; border: 1px solid rgba(255,255,255,.16); border-radius: 20px 20px 20px 4px; background: rgba(255,255,255,.07); color: white; backdrop-filter: blur(4px); transition: transform .25s ease, background .25s ease; }
.course-card:hover { transform: translateY(-5px); background: rgba(255,255,255,.11); }
.course-card span { display: block; color: #cddbbd; font-size: .8rem; font-weight: 700; letter-spacing: .1em; }
.course-card h3 { margin: 66px 0 0; font-size: 1.2rem; line-height: 1.25; }

.publication-top { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 46px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.filter { padding: 9px 15px; border: 1px solid var(--line); border-radius: 999px; background: white; color: var(--green-deep); cursor: pointer; transition: .2s ease; }
.filter:hover, .filter.is-active { border-color: var(--green); background: var(--green); color: white; }
.publication-list { display: grid; gap: 14px; }
.publication-card { display: grid; grid-template-columns: 110px 1fr; gap: 24px; padding: 26px 28px; border: 1px solid rgba(49,82,27,.12); border-radius: 22px 22px 22px 5px; background: white; box-shadow: 0 12px 35px rgba(20,34,12,.045); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.publication-card:hover { transform: translateY(-3px); border-color: rgba(49,82,27,.3); box-shadow: 0 18px 44px rgba(20,34,12,.08); }
.publication-card.is-hidden { display: none; }
.pub-year { color: var(--green); font-size: 1.45rem; font-weight: 700; }
.pub-body { padding-left: 24px; border-left: 1px solid var(--line); }
.pub-authors { margin: 0 0 5px; color: var(--muted); font-size: .9rem; }
.pub-body h3 { margin: 0; font-size: 1.13rem; line-height: 1.35; }
.pub-body p:not(.pub-authors) { margin: 9px 0 0; color: #565c53; font-size: .94rem; }
.pub-body a { display: inline-block; margin-top: 10px; color: var(--green); font-weight: 700; font-size: .9rem; overflow-wrap: anywhere; }

.document-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 36px; }
.pdf-shell { position: relative; padding: 14px; border: 1px solid rgba(49,82,27,.22); border-radius: 28px; background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(238,243,232,.92)); box-shadow: 0 28px 80px rgba(20,34,12,.12); }
.pdf-shell::before { content: ""; position: absolute; inset: -20px; z-index: -1; border-radius: 42px; background: radial-gradient(circle at center, rgba(49,82,27,.12), transparent 72%); filter: blur(20px); }
.pdf-viewer { display: block; width: 100%; height: min(78vh, 900px); min-height: 620px; border: 1px solid rgba(49,82,27,.12); border-radius: 18px; background: white; }
.pdf-fallback { display: grid; gap: 14px; place-items: center; padding: 20px; color: var(--green); font-weight: 700; text-decoration: none; }
.pdf-fallback img { max-height: 760px; border-radius: 12px; }

.contact-section { background: #172510; overflow: hidden; }
.contact-section::before { content: ""; position: absolute; width: 540px; height: 540px; left: -220px; bottom: -260px; border-radius: 50%; background: radial-gradient(circle, rgba(112,143,55,.22), rgba(112,143,55,0)); }
.contact-grid { position: relative; display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: center; }
.contact-cards { display: grid; gap: 14px; }
.contact-card { display: grid; grid-template-columns: 52px 1fr 28px; gap: 16px; align-items: center; padding: 18px; border: 1px solid rgba(255,255,255,.12); border-radius: 18px; background: rgba(255,255,255,.065); color: white; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.contact-card:hover { transform: translateX(5px); background: rgba(255,255,255,.1); }
.contact-icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; background: #31521b; color: white; font-size: 1.1rem; }
.contact-card small { display: block; color: #bdc8b7; }
.contact-card strong { display: block; margin-top: 2px; overflow-wrap: anywhere; font-size: .98rem; }
.contact-arrow { color: #b8ca9f; font-size: 1.2rem; }

.site-footer { background: #0f180b; color: #cbd2c7; border-top: 1px solid rgba(255,255,255,.08); }
.footer-content { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-content p { margin: 0; }
.footer-content a { color: #dfe5dc; text-decoration: none; }

.back-to-top { position: fixed; right: 22px; bottom: 22px; z-index: 80; width: 46px; height: 46px; border: 1px solid rgba(255,255,255,.5); border-radius: 50%; background: var(--green); color: white; box-shadow: 0 10px 30px rgba(20,34,12,.2); opacity: 0; visibility: hidden; transform: translateY(10px); cursor: pointer; transition: .25s ease; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* Cloudflare-safe progressive enhancement: all content is visible by default.
   JavaScript only adds a subtle entrance animation; it is never required to see the page. */
.reveal { opacity: 1; transform: none; }
.reveal.is-visible { animation: revealUp .65s ease both; animation-delay: var(--delay, 0ms); }
@keyframes revealUp {
  from { opacity: .01; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}

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

@media (max-width: 980px) {
  .section { padding: 90px 0; }
  .menu-toggle { display: block; }
  .nav-links { position: fixed; top: 78px; left: 20px; right: 20px; display: grid; gap: 5px; padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.98); box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(-8px); transition: .22s ease; }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding: 12px 14px; }
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { text-align: center; }
  .hero-lead { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .research-strip { grid-template-columns: 1fr; text-align: left; max-width: 720px; margin-inline: auto; }
  .portrait-frame { width: min(78vw, 430px); }
  .portrait-caption { left: -18px; }
  .two-column { grid-template-columns: 1fr; gap: 44px; }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .publication-top { align-items: start; flex-direction: column; }
  .contact-grid { grid-template-columns: 1fr; gap: 42px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .section { padding: 74px 0; }
  .nav { min-height: 70px; }
  .nav-links { top: 70px; left: 14px; right: 14px; }
  .brand-text strong { font-size: .78rem; }
  .brand-text span { font-size: .75rem; }
  .brand-mark { width: 38px; height: 38px; }
  .hero { padding-top: 70px; }
  .hero h1 { font-size: clamp(2.9rem, 15vw, 4.4rem); }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .portrait-frame { width: min(90vw, 390px); padding: 18px; border-radius: 28px 28px 28px 7px; }
  .portrait-caption { left: 10px; right: 10px; bottom: 10px; max-width: none; }
  .portrait-accent { width: 64px; height: 64px; right: -8px; top: -10px; }
  .section-heading h2 { font-size: 2.55rem; }
  .profile-panel { padding: 20px; }
  .research-card { grid-template-columns: 46px 1fr; }
  .research-number { width: 40px; height: 40px; }
  .timeline::before { left: 16px; }
  .timeline-item { grid-template-columns: 1fr; padding-left: 44px; min-height: 0; }
  .timeline-item::before { left: 10px; top: 28px; }
  .timeline-year { font-size: 1.2rem; }
  .timeline-content { padding: 6px 0 26px; }
  .career-note { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: 1fr; }
  .course-card { min-height: 150px; }
  .course-card h3 { margin-top: 36px; }
  .publication-card { grid-template-columns: 1fr; padding: 22px; }
  .pub-body { padding-left: 0; padding-top: 14px; border-left: 0; border-top: 1px solid var(--line); }
  .document-heading { align-items: start; flex-direction: column; }
  .document-heading .btn { width: auto; }
  .pdf-shell { padding: 8px; border-radius: 20px; }
  .pdf-viewer { height: 68vh; min-height: 480px; border-radius: 14px; }
  .contact-card { grid-template-columns: 46px 1fr 18px; padding: 15px; }
  .contact-icon { width: 42px; height: 42px; }
  .footer-content { padding: 22px 0; flex-direction: column; align-items: flex-start; gap: 6px; }
  .back-to-top { right: 14px; bottom: 14px; }
}