/* ============================================================
   Das Group — Academic Website
   Fonts: Cormorant Garamond (headings) + Jost (body/nav)
   ============================================================ */

:root {
  --bg:          #F7F6F3;
  --bg-alt:      #EEEDE9;
  --text:        #1A1A1A;
  --text-muted:  #5E5E5E;
  --accent:      #1E3A5F;
  --accent-mid:  #2E5080;
  --border:      #CCCCC7;
  --white:       #FFFFFF;

  --font-head: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Jost', 'Helvetica Neue', sans-serif;

  --nav-h:    66px;
  --wide:     1080px;
  --gap:      40px;
}

/* ─── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-mid); }

/* ─── Layout helpers ─────────────────────────────────────── */
.wrap {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* ─── Navigation ─────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  height: var(--nav-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 200;
}

.nav-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-head);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: .02em;
}
.nav-brand:hover { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  font-size: .8rem;
  font-weight: 400;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: .3s;
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  height: 460px;
  overflow: hidden;
  background: var(--accent);
  position: relative;
}
.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .65;
}
.hero-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(140deg, #1E3A5F 0%, #0D2140 55%, #081526 100%);
}

/* ─── Home: intro split ──────────────────────────────────── */
.home-intro {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 64px var(--gap) 56px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 64px;
  align-items: start;
}

.intro-name {
  font-family: var(--font-head);
  font-size: 2.7rem;
  font-weight: 500;
  line-height: 1.1;
  margin-bottom: 6px;
}
.intro-title {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.intro-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.intro-badges a {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 5px 13px;
  border-radius: 1px;
  transition: background .2s, color .2s;
}
.intro-badges a:hover { background: var(--accent); color: var(--white); }

.intro-body p {
  font-size: 1.02rem;
  line-height: 1.82;
  margin-bottom: 16px;
}
.intro-body p:last-child { margin-bottom: 0; }

/* ─── Section wrapper ────────────────────────────────────── */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 500;
  margin-bottom: 36px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

/* ─── News ───────────────────────────────────────────────── */
.news-list { list-style: none; }

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.news-item:first-child { border-top: 1px solid var(--border); }

.news-date {
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-top: 3px;
}
.news-text { font-size: .97rem; line-height: 1.65; }

/* ─── Page header (inner pages) ──────────────────────────── */
.page-header {
  padding: 56px 0 36px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 56px;
}
.page-header h1 {
  font-family: var(--font-head);
  font-size: 3rem;
  font-weight: 500;
  margin-bottom: 6px;
}
.page-header .subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ─── Research page ──────────────────────────────────────── */
.research-lede {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--accent);
  line-height: 1.8;
  max-width: 820px;
  margin-bottom: 64px;
  padding-left: 20px;
  border-left: 3px solid var(--accent);
}

.research-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}
.research-item:first-of-type { padding-top: 0; }
.research-item:last-of-type  { border-bottom: none; }

.research-item.flip { direction: rtl; }
.research-item.flip > * { direction: ltr; }

.r-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 2px;
}
.r-img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: .82rem;
  text-align: center;
  padding: 12px;
}

.r-text .area-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.r-text h2 {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 16px;
  line-height: 1.2;
}
.r-text p { font-size: .98rem; line-height: 1.82; }

/* ─── Publications page ──────────────────────────────────── */
.pub-google-link {
  font-size: .9rem;
  margin-bottom: 48px;
  padding: 14px 20px;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 1px;
}

.pub-section { margin-bottom: 52px; }

.pub-section h2 {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 500;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.pub-list { list-style: none; }

.pub-entry {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.pub-entry:last-child { border-bottom: none; }

.pub-n {
  font-size: .82rem;
  font-weight: 500;
  color: var(--text-muted);
  padding-top: 2px;
  text-align: right;
}

.pub-title {
  font-weight: 500;
  font-size: .97rem;
  margin-bottom: 4px;
  color: var(--accent);
}
.pub-title a { color: inherit; }
.pub-title a:hover { text-decoration: underline; }

.pub-authors {
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.pub-authors strong { color: var(--text); font-weight: 600; }

.pub-venue {
  font-size: .84rem;
  color: var(--text-muted);
  font-style: italic;
}

.pub-tag {
  display: inline-block;
  font-style: normal;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--white);
  padding: 1px 6px;
  border-radius: 2px;
  margin-left: 6px;
  vertical-align: middle;
}

/* ─── People page ────────────────────────────────────────── */
.people-intro {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 56px;
}

.person-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.person-card:first-of-type { border-top: 1px solid var(--border); }

.person-photo img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: 2px;
}
.person-photo-placeholder {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  color: var(--text-muted);
}

.person-info h2 {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 500;
  margin-bottom: 4px;
}
.person-info .person-role {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: 24px;
}

.cv-list { list-style: none; margin-bottom: 20px; }
.cv-list li {
  font-size: .93rem;
  padding: 7px 0;
  border-bottom: 1px solid var(--bg-alt);
  color: var(--text);
}
.cv-list li:last-child { border-bottom: none; }

.person-bio {
  font-size: .93rem;
  line-height: 1.78;
  margin-top: 16px;
}

/* ─── Contact page ───────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 12px;
}

.contact-block h2 {
  font-family: var(--font-head);
  font-size: 1.55rem;
  font-weight: 500;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.contact-block p,
.contact-block address { font-style: normal; font-size: .95rem; line-height: 1.82; }
.contact-block a { font-size: .95rem; }

/* ─── Footer ─────────────────────────────────────────────── */
footer {
  margin-top: 80px;
  background: #68246D;
  color: #888;
  padding: 36px 0;
}
.footer-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}
.footer-copy { font-size: .92rem; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { font-size: .92rem; color: #888; }
.footer-links a:hover { color: #ddd; }

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 820px) {
  :root { --gap: 24px; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 20px var(--gap);
    gap: 14px;
    box-shadow: 0 4px 12px rgba(0,0,0,.06);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .hero { height: 300px; }

  .home-intro {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 48px var(--gap) 40px;
  }

  .research-item,
  .research-item.flip {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 24px;
  }

  .person-card { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; }

  .page-header h1 { font-size: 2.2rem; }
}