:root {
  --ink: #15374a;
  --ink-strong: #0b2e43;
  --muted: #5b7180;
  --line: #d9e6eb;
  --soft: #f3f8fa;
  --paper: #ffffff;
  --teal: #0d718d;
  --teal-dark: #0e4f66;
  --aqua: #dff2f5;
  --sand: #f5efe8;
  --shadow: 0 18px 48px rgba(12, 53, 73, 0.09);
  --radius: 22px;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; width: 100%; }
a { color: inherit; }

.skip-link {
  position: fixed; left: 12px; top: 12px; z-index: 100;
  background: white; border-radius: 10px; padding: 8px 12px;
  transform: translateY(-160%); transition: transform .2s;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(217,230,235,.85);
}
.nav-shell {
  max-width: var(--max); margin: 0 auto; min-height: 78px; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px;
}
.brand { text-decoration: none; display: grid; line-height: 1.1; }
.brand-name { font: 700 1.35rem/1.2 Georgia, "Times New Roman", serif; color: var(--ink-strong); }
.brand-subtitle { margin-top: 6px; color: var(--muted); font-size: .72rem; letter-spacing: .04em; }
.main-nav { display: flex; align-items: center; gap: 20px; }
.main-nav a { text-decoration: none; font-size: .9rem; font-weight: 650; color: #36586a; }
.main-nav a:hover { color: var(--teal); }
.menu-button { display: none; border: 1px solid var(--line); border-radius: 12px; background: white; color: var(--ink); padding: 8px 12px; font-weight: 700; }

.hero {
  max-width: 1380px; margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(420px, .92fr);
  min-height: 630px; overflow: hidden;
  background: linear-gradient(135deg, #eaf6f8 0%, #f9fcfd 60%, #eef6f8 100%);
}
.hero-photo {
  min-height: 630px;
  background-image: linear-gradient(90deg, transparent 74%, rgba(234,246,248,.92) 100%), url('ceren-sunset.jpg');
  background-size: cover; background-position: center 38%;
}
.hero-copy { align-self: center; padding: 64px 70px 64px 45px; max-width: 700px; }
.eyebrow, .kicker { margin: 0 0 10px; font-size: .75rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; color: var(--teal); }
.hero h1, .section h2, .contact h2 {
  margin: 0; color: var(--ink-strong); font-family: Georgia, "Times New Roman", serif;
  font-weight: 700; line-height: 1.05;
}
.hero h1 { font-size: clamp(3rem, 5vw, 5.6rem); letter-spacing: -.035em; }
.hero-fields { margin: 18px 0 16px; font-size: 1.16rem; font-family: Georgia, "Times New Roman", serif; color: var(--teal-dark); }
.hero-text { color: #486677; font-size: 1.02rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; border-radius: 999px; padding: 12px 20px; font-weight: 750; border: 1px solid transparent; }
.button.primary { background: var(--teal-dark); color: white; box-shadow: 0 10px 28px rgba(14,79,102,.2); }
.button.primary:hover { background: #0a4256; }
.button.ghost { background: white; border-color: #bed3dc; color: var(--teal-dark); }
.button.small { padding: 9px 15px; font-size: .9rem; }

.section { max-width: var(--max); margin: 0 auto; padding: 90px 24px; }
.section.soft { max-width: none; padding-left: max(24px, calc((100% - var(--max))/2 + 24px)); padding-right: max(24px, calc((100% - var(--max))/2 + 24px)); background: var(--soft); }
.intro-strip { padding-top: 34px; padding-bottom: 34px; display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }
.stat-card { border: 1px solid var(--line); border-radius: 17px; padding: 17px 18px; display: grid; gap: 2px; background: white; }
.stat-card strong { color: var(--teal-dark); font-family: Georgia, serif; font-size: 1.05rem; }
.stat-card span { color: var(--muted); font-size: .86rem; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section h2, .contact h2 { font-size: clamp(2.1rem, 3vw, 3.35rem); letter-spacing: -.025em; }
.section-lede { margin: 0; max-width: 520px; color: var(--muted); }
.kicker { margin-bottom: 8px; }
.text-link { color: var(--teal); text-decoration: none; font-weight: 750; white-space: nowrap; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }

.card-grid { display: grid; gap: 16px; }
.card-grid.three { grid-template-columns: repeat(3,1fr); }
.card-grid.four { grid-template-columns: repeat(4,1fr); }
.feature-card, .course-card {
  background: white; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: 0 6px 18px rgba(13,75,96,.035);
}
.feature-card .icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--aqua); color: var(--teal); font: 700 1.35rem/1 Georgia, serif; }
.feature-card h3, .course-card h3 { margin: 18px 0 8px; color: var(--ink-strong); font-family: Georgia, serif; font-size: 1.23rem; line-height: 1.25; }
.feature-card p, .course-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.course-card > span { color: var(--teal); font-size: .76rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }

.research-photo-row { margin-top: 44px; display: grid; grid-template-columns: minmax(280px,.65fr) minmax(0,1.35fr); background: var(--sand); border-radius: var(--radius); overflow: hidden; }
.research-photo-row img { height: 360px; object-fit: cover; object-position: center 40%; }
.research-photo-row blockquote { margin: 0; padding: 50px; display: flex; align-items: center; }
.research-photo-row blockquote p { margin: 0; font: italic 1.7rem/1.45 Georgia, serif; color: #31576a; }

.publication-list { display: grid; gap: 10px; }
.publication { display: grid; grid-template-columns: 90px 1fr; gap: 22px; padding: 22px 24px; background: white; border: 1px solid var(--line); border-radius: 16px; }
.pub-year { color: var(--teal); font-weight: 800; letter-spacing: .02em; }
.publication h3 { margin: 0; color: var(--ink-strong); font: 700 1.06rem/1.35 Georgia, serif; }
.publication p { margin: 5px 0 0; color: var(--muted); font-size: .9rem; }

.timeline { position: relative; display: grid; gap: 16px; }
.timeline::before { content: ""; position: absolute; top: 10px; bottom: 10px; left: 154px; width: 1px; background: var(--line); }
.timeline-item { display: grid; grid-template-columns: 132px 1fr; gap: 44px; position: relative; }
.timeline-date { padding-top: 25px; color: var(--muted); font-size: .86rem; font-weight: 800; text-align: right; }
.timeline-body { position: relative; padding: 23px 26px; border: 1px solid var(--line); border-radius: 18px; background: white; }
.timeline-body::before { content: ""; position: absolute; top: 28px; left: -28px; width: 12px; height: 12px; border-radius: 50%; background: var(--teal); border: 4px solid white; box-shadow: 0 0 0 1px var(--line); }
.timeline-item.featured .timeline-body { background: linear-gradient(135deg,#f7fcfd,#eef7f9); }
.tag { display: inline-flex; border-radius: 999px; padding: 5px 10px; background: var(--aqua); color: var(--teal-dark); font-size: .74rem; font-weight: 800; }
.timeline h3 { margin: 11px 0 7px; color: var(--ink-strong); font: 700 1.24rem/1.35 Georgia, serif; }
.timeline p { margin: 0 0 8px; color: var(--muted); }

.cv-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.cv-block { border-left: 3px solid #b9dce5; padding: 8px 0 8px 22px; }
.cv-block h3 { margin: 0 0 8px; font: 700 1.18rem/1.25 Georgia, serif; color: var(--ink-strong); }
.cv-block p { margin: 7px 0; color: var(--muted); }

.gallery-section { padding-top: 68px; }
.gallery { display: grid; grid-template-columns: 1.45fr 1fr 1fr; grid-auto-rows: 235px; gap: 12px; }
.gallery figure { margin: 0; border-radius: 18px; overflow: hidden; background: #e8eff2; }
.gallery figure.gallery-large { grid-row: span 2; }
.gallery img { height: 100%; object-fit: cover; transition: transform .35s ease; }
.gallery figure:hover img { transform: scale(1.025); }

.contact { background: linear-gradient(135deg, #0c4257, #0e657a); color: white; }
.contact-shell { max-width: var(--max); margin: 0 auto; padding: 72px 24px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 64px; align-items: center; }
.contact h2 { color: white; }
.contact p { color: #d7e8ed; }
.kicker.light { color: #9fd7e3; }
.contact-links { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; }
.contact-links a { text-decoration: none; border: 1px solid rgba(255,255,255,.18); border-radius: 15px; padding: 15px 16px; background: rgba(255,255,255,.06); display: grid; }
.contact-links a:hover { background: rgba(255,255,255,.1); }
.contact-links span { color: #acd8e2; font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 800; }
.contact-links strong { margin-top: 3px; font-size: .88rem; font-weight: 650; overflow-wrap: anywhere; }

.site-footer { max-width: var(--max); margin: 0 auto; padding: 30px 24px 44px; color: var(--muted); display: flex; justify-content: space-between; gap: 24px; font-size: .84rem; }
.site-footer > div:first-child { display: grid; }
.site-footer strong { color: var(--ink); font-family: Georgia, serif; }

@media (max-width: 940px) {
  .hero { grid-template-columns: 1fr; }
  .hero-photo { min-height: 510px; background-image: linear-gradient(0deg, rgba(234,246,248,.32), transparent 30%), url('ceren-sunset.jpg'); }
  .hero-copy { padding: 52px 24px 62px; max-width: var(--max); margin: 0 auto; }
  .intro-strip { grid-template-columns: repeat(2,1fr); }
  .card-grid.three, .card-grid.four { grid-template-columns: repeat(2,1fr); }
  .contact-shell { grid-template-columns: 1fr; gap: 28px; }
  .gallery { grid-template-columns: 1.2fr 1fr; }
  .main-nav { display: none; position: absolute; top: 78px; left: 0; right: 0; padding: 18px 24px 24px; background: white; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; }
  .main-nav.open { display: flex; }
  .menu-button { display: inline-flex; }
}

@media (max-width: 680px) {
  .nav-shell { min-height: 70px; }
  .brand-subtitle { display: none; }
  .hero-photo { min-height: 440px; }
  .hero h1 { font-size: 3.2rem; }
  .section { padding: 68px 18px; }
  .section.soft { padding-left: 18px; padding-right: 18px; }
  .section-heading { align-items: start; flex-direction: column; gap: 12px; }
  .intro-strip, .card-grid.three, .card-grid.four, .cv-grid, .contact-links { grid-template-columns: 1fr; }
  .research-photo-row { grid-template-columns: 1fr; }
  .research-photo-row img { height: 310px; }
  .research-photo-row blockquote { padding: 32px; }
  .research-photo-row blockquote p { font-size: 1.35rem; }
  .publication { grid-template-columns: 1fr; gap: 4px; }
  .timeline::before { left: 7px; }
  .timeline-item { grid-template-columns: 1fr; gap: 6px; padding-left: 28px; }
  .timeline-date { text-align: left; padding-top: 0; }
  .timeline-body::before { left: -27px; top: 29px; }
  .gallery { grid-template-columns: 1fr 1fr; grid-auto-rows: 190px; }
  .gallery figure.gallery-large { grid-column: span 2; grid-row: span 2; }
  .site-footer { flex-direction: column; }
}