/* =========================================================
   LaLA Lab — Main Stylesheet
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Instrument+Sans:wght@400;500;600&display=swap');

:root {
  --color-bg:        #F7F4F0;
  --color-bg-card:   #FFFFFF;
  --color-primary:   #1e3a5f;
  --color-accent:    #4a7eb5;
  --color-accent-lt: #d6e4f4;
  --color-muted:     #6b7280;
  --color-border:    #e2ddd8;
  --color-text:      #111827;
  --font-serif:      'Fraunces', Georgia, serif;
  --font-sans:       'Instrument Sans', system-ui, sans-serif;
  --max-w:           1100px;
  --nav-h:           64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ── Layout ─────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.page-section { padding-block: 4rem; }
.page-section + .page-section { border-top: 1px solid var(--color-border); }

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--color-muted);
  font-size: 1rem;
  margin-bottom: 2.5rem;
}

/* ── Navigation ─────────────────────────────────────────── */

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-logo:hover { text-decoration: none; color: var(--color-accent); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-menu a {
  display: block;
  padding: 0.375rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}

.nav-menu a:hover,
.nav-menu .current-menu-item > a,
.nav-menu .current_page_item > a {
  background: var(--color-accent-lt);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  transition: 0.2s;
}

/* ── Hero ────────────────────────────────────────────────── */

.hero {
  text-align: center;
  padding-block: 6rem 4rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero h1 em {
  font-style: italic;
  color: var(--color-accent);
}

.hero p {
  max-width: 600px;
  margin-inline: auto;
  font-size: 1.125rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ─────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.625rem 1.4rem;
  border-radius: 999px;
  font-size: 0.925rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: 0.15s;
  text-decoration: none !important;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent); color: #fff; }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-accent-lt); }

/* ── Cards ───────────────────────────────────────────────── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: box-shadow 0.2s;
}

.card:hover { box-shadow: 0 4px 20px rgba(30,58,95,0.08); }

.card-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.card p { font-size: 0.925rem; color: var(--color-muted); }

/* ── Tags ────────────────────────────────────────────────── */

.tag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-lt);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
}

/* ── People ──────────────────────────────────────────────── */

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}

.person-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  transition: box-shadow 0.2s;
}

.person-card:hover { box-shadow: 0 4px 20px rgba(30,58,95,0.08); }

.person-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin-inline: auto;
  margin-bottom: 1rem;
  background: var(--color-accent-lt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-accent);
  overflow: hidden;
}

.person-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.person-role {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.person-interests {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.person-links { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; }
.person-links a {
  font-size: 0.8rem;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}
.person-links a:hover { background: var(--color-accent-lt); text-decoration: none; }

/* ── Publications ────────────────────────────────────────── */

.pub-year-group { margin-bottom: 3rem; }

.pub-year-heading {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

.pub-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.pub-item:last-child { border-bottom: none; }

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.pub-venue {
  font-size: 0.85rem;
  color: var(--color-muted);
  font-style: italic;
  margin-bottom: 0.75rem;
}

.pub-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.pub-links a {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  transition: 0.15s;
}
.pub-links a:hover { background: var(--color-accent); color: #fff; text-decoration: none; }

/* ── News ────────────────────────────────────────────────── */

.news-list { display: flex; flex-direction: column; gap: 1.5rem; }

.news-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  gap: 1.5rem;
}

.news-date {
  flex-shrink: 0;
  width: 60px;
  text-align: center;
}

.news-date .month {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.news-date .day {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.news-date .year {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.news-body h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.news-body h3 a { color: inherit; }
.news-body h3 a:hover { color: var(--color-accent); text-decoration: none; }

.news-body p { font-size: 0.9rem; color: var(--color-muted); }

/* ── Position Listings ───────────────────────────────────── */

.position-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.position-type-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-accent);
  background: var(--color-accent-lt);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.position-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.position-section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-muted);
  margin-bottom: 0.4rem;
  margin-top: 1.25rem;
}

.position-body { font-size: 0.95rem; color: var(--color-text); }
.position-body ul { padding-left: 1.25rem; }
.position-body li { margin-bottom: 0.25rem; }

/* ── Contact ─────────────────────────────────────────────── */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-detail { display: flex; gap: 0.75rem; margin-bottom: 1.25rem; align-items: flex-start; }
.contact-detail-icon { font-size: 1.25rem; margin-top: 2px; }
.contact-detail-text { font-size: 0.95rem; }
.contact-detail-text strong { display: block; font-weight: 600; color: var(--color-primary); }

.map-placeholder {
  background: var(--color-accent-lt);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 0.9rem;
}

/* ── Teaching ────────────────────────────────────────────── */

.course-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.course-semester {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-accent);
  text-align: center;
  background: var(--color-accent-lt);
  border-radius: 6px;
  padding: 0.35rem 0.65rem;
  white-space: nowrap;
  margin-top: 4px;
}

.course-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.course-body { font-size: 0.9rem; color: var(--color-muted); }

/* ── Single Pages ────────────────────────────────────────── */

.single-wrap { max-width: 720px; margin-inline: auto; padding-block: 3rem; }

.single-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.entry-content { font-size: 1rem; line-height: 1.8; }
.entry-content p { margin-bottom: 1rem; }
.entry-content h2, .entry-content h3 { font-family: var(--font-serif); color: var(--color-primary); margin-block: 1.5rem 0.5rem; }
.entry-content ul, .entry-content ol { padding-left: 1.5rem; margin-bottom: 1rem; }

/* ── Homepage Sections ───────────────────────────────────── */

.home-intro {
  border-bottom: 1px solid var(--color-border);
}

.stats-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.stat-item { text-align: center; }
.stat-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
}
.stat-label { font-size: 0.85rem; color: var(--color-muted); }

.featured-pub-box {
  background: var(--color-primary);
  color: #fff;
  border-radius: 12px;
  padding: 2rem;
  margin-top: 3rem;
}

.featured-pub-box .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-lt);
  margin-bottom: 0.5rem;
}

.featured-pub-box h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.featured-pub-box p { font-size: 0.9rem; opacity: 0.8; }

/* ── Page Title Banner ───────────────────────────────────── */

.page-banner {
  background: var(--color-primary);
  color: #fff;
  padding-block: 3rem;
}

.page-banner h1 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.page-banner p {
  opacity: 0.75;
  font-size: 1rem;
}

/* ── Publication Links Row & Cite Button ─────────────────── */

.pub-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: flex-start;
}

.pub-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  background: transparent;
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.15s, color 0.15s;
  line-height: 1.6;
  text-decoration: none !important;
}

.pub-link-btn:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.pub-cite-btn { position: relative; }
.cite-chevron { font-size: 0.9rem; line-height: 1; transition: transform 0.2s; display: inline-block; }
.pub-cite-btn[aria-expanded="true"] .cite-chevron { transform: rotate(180deg); }

/* ── BibTeX Block ─────────────────────────────────────────── */

.bibtex-block {
  margin-top: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  background: #f9f8f6;
}

.bibtex-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.9rem;
  background: #f0ede8;
  border-bottom: 1px solid var(--color-border);
}

.bibtex-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  font-family: var(--font-sans);
}

.bibtex-copy-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--color-muted);
  font-family: var(--font-sans);
  padding: 0;
  transition: color 0.15s;
}
.bibtex-copy-btn:hover { color: var(--color-primary); }
.bibtex-copy-btn.copied { color: #16a34a; }

.bibtex-code {
  margin: 0;
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
  color: var(--color-text);
  background: transparent;
}

/* ── Lab Photo ───────────────────────────────────────────── */

.lab-photo-wrap {
  background: var(--color-bg);
  padding-bottom: 4rem;
}

.lab-photo {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 40px rgba(30,58,95,0.10);
  position: relative;
}

.lab-photo img {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  display: block;
}

.lab-photo figcaption {
  background: rgba(30,58,95,0.75);
  color: rgba(255,255,255,0.88);
  font-size: 0.825rem;
  text-align: center;
  padding: 0.55rem 1.25rem;
  backdrop-filter: blur(4px);
}

/* ── Footer ──────────────────────────────────────────────── */

.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  padding-block: 3rem 2rem;
  margin-top: 5rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.footer-section h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.75rem;
}

.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: 0.4rem; }
.footer-section a { color: rgba(255,255,255,0.7); font-size: 0.9rem; }
.footer-section a:hover { color: #fff; text-decoration: none; }

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8rem;
  text-align: center;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-menu { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); flex-direction: column; padding: 1rem 1.5rem; gap: 0; }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 0.6rem 0; border-radius: 0; border-bottom: 1px solid var(--color-border); }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .news-item { flex-direction: column; gap: 0.75rem; }
  .course-item { flex-direction: column; gap: 0.5rem; }
}

/* ── Utility ─────────────────────────────────────────────── */

.text-muted { color: var(--color-muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.read-more { font-size: 0.875rem; font-weight: 500; color: var(--color-accent); }
.pi-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-primary);
  color: #fff;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.35rem;
}