/* ─── Reset & Base ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Eco-Academic design system */
  --primary:            #173809;
  --primary-container:  #2d4f1e;
  --on-primary-container: #98c083;
  --primary-fixed-dim:  #a9d293;

  --surface:                 #f8f9fa;
  --surface-bright:          #ffffff;
  --surface-container-lowest: #ffffff;
  --surface-container-low:   #f3f4f5;
  --surface-container:       #edeeef;
  --surface-container-high:  #e7e8e9;
  --surface-container-highest: #e1e3e4;

  --on-surface:         #191c1d;
  --on-surface-variant: #43493e;
  --outline:            #73796d;
  --outline-variant:    #c3c8bb;

  --secondary:           #5a6059;
  --secondary-container: #dfe4db;

  --tertiary:            #7a5230;
  --tertiary-container:  #f4dfcf;

  --card-shadow: 0 2px 16px rgba(23, 56, 9, 0.07);
  --nav-height:  64px;
  --font-sans:   'Hanken Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius:      4px;
  --radius-lg:   8px;
  --transition:  0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--on-surface);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--primary-container); }

img { display: block; width: 100%; height: auto; }

/* ─── Layout ─────────────────────────────────────────────────────────── */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--surface-container-lowest);
  border-top: 1px solid var(--outline-variant);
  border-bottom: 1px solid var(--outline-variant);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--primary);
  margin-bottom: 8px;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--on-surface-variant);
  margin-bottom: 48px;
  max-width: 620px;
}

/* ─── Header / Nav ──────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--primary);
  height: var(--nav-height);
}

.nav-container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  flex-shrink: 0;
}
.nav-brand:hover { color: var(--primary-fixed-dim); }

.nav-links {
  list-style: none;
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.nav-links a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.78);
  letter-spacing: 0.01em;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.12);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.9);
  border-radius: 2px;
  transition: var(--transition);
}

/* ─── Page Header (interior pages) ─────────────────────────────────── */
.page-header {
  padding: 64px 0 40px;
}
.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
  margin-bottom: 12px;
}
.page-header p {
  font-size: 1.125rem;
  color: var(--on-surface-variant);
  max-width: 620px;
}

/* ─── Hero ───────────────────────────────────────────────────────────── */
.hero {
  padding: 64px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: center;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img,
.photo-placeholder {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  border: 1px solid var(--outline-variant);
}

.photo-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
  color: rgba(255,255,255,0.9);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  user-select: none;
}

.hero-name {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
  line-height: 1.15;
  margin-bottom: 6px;
}

.hero-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  margin-bottom: 10px;
  letter-spacing: 0.01em;
}

.hero-affiliation {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.affil-badge {
  display: inline-block;
  font-size: 0.775rem;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.affil-meta {
  background: var(--on-primary-container);
  color: var(--primary-container);
}

.affil-dot { color: var(--outline-variant); }

.hero-bio {
  font-size: 1rem;
  color: var(--on-surface);
  margin-bottom: 14px;
  max-width: 620px;
  line-height: 1.75;
}
.hero-bio:last-of-type { margin-bottom: 24px; }

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary);
  border: 1px solid var(--outline-variant);
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.icon-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}
.icon-link:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--surface-container-low);
}

/* ─── Work / Project Grid ───────────────────────────────────────────── */
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.work-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--outline-variant);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.work-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-shadow);
}
.work-card.featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.work-card-image {
  position: relative;
  height: 160px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 12px 14px;
  overflow: hidden;
}
.work-card.featured .work-card-image {
  height: auto;
  min-height: 200px;
}
.work-card-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}

.work-company-badge {
  position: relative;
  display: inline-block;
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(0,0,0,0.4);
  color: rgba(255,255,255,0.95);
  padding: 3px 8px;
  border-radius: 3px;
  backdrop-filter: blur(4px);
}

.work-year {
  position: relative;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.75);
  align-self: flex-end;
}

.featured-badge {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--tertiary-container);
  color: var(--tertiary);
  padding: 3px 8px;
  border-radius: 3px;
}

.work-card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.work-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1.4;
}
.work-card.featured .work-title { font-size: 1.3rem; }

.work-desc {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 14px;
}

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  background: var(--surface-container-low);
  padding: 3px 9px;
  border-radius: var(--radius);
}

.work-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.work-link:hover { color: var(--primary-container); }

/* ─── Publications ───────────────────────────────────────────────────── */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 32px;
}

.pub-item {
  padding-bottom: 32px;
  border-bottom: 1px solid var(--outline-variant);
}
.pub-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.pub-venue {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  background: var(--surface-container-low);
  padding: 3px 9px;
  border-radius: var(--radius);
}

.pub-year {
  font-size: 0.8rem;
  color: var(--outline);
}

.pub-title {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
}
.pub-title a { color: var(--on-surface); }
.pub-title a:hover { color: var(--primary); }

.pub-authors {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  margin-bottom: 10px;
}
.pub-authors strong { color: var(--on-surface); font-weight: 600; }

.pub-links {
  display: flex;
  gap: 10px;
}

.pub-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  border: 1px solid var(--outline-variant);
  padding: 5px 12px;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.pub-link:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.pub-note {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}

/* ─── Research page: year grouping ─────────────────────────────────── */
.pub-year-group {
  margin-bottom: 64px;
}
.pub-year-group:last-child { margin-bottom: 0; }

.pub-year-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--outline-variant);
  padding-bottom: 12px;
  margin-bottom: 32px;
}
.pub-year-heading h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}
.pub-year-heading span {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--outline);
}

/* ─── About page ─────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 80px;
}
.about-photo img,
.about-grid .photo-placeholder {
  width: 100%;
  aspect-ratio: 1;
  height: auto;
}
.about-bio h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
  margin-bottom: 20px;
}
.about-bio p {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 640px;
}
.about-bio p:last-child { margin-bottom: 0; }

.about-section {
  max-width: 800px;
  margin-bottom: 64px;
}
.about-section:last-child { margin-bottom: 0; }
.about-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  border-bottom: 1px solid var(--outline-variant);
  padding-bottom: 12px;
  margin-bottom: 32px;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.timeline-item {
  display: flex;
  gap: 24px;
}
.timeline-date {
  flex-shrink: 0;
  width: 130px;
  font-size: 0.85rem;
  color: var(--outline);
  padding-top: 2px;
}
.timeline-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--on-surface);
}
.timeline-org {
  font-size: 0.95rem;
  color: var(--on-surface-variant);
  margin-top: 2px;
}
.timeline-detail {
  font-size: 0.875rem;
  color: var(--outline);
  margin-top: 6px;
}

.interest-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.interest-list span {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--on-surface-variant);
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  padding: 6px 14px;
  border-radius: 20px;
}

/* ─── Photography Grid ───────────────────────────────────────────────── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 32px;
}

.photo-thumb {
  display: block;
  aspect-ratio: 4/3;
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), opacity var(--transition);
  cursor: pointer;
}
.photo-thumb:hover { transform: scale(1.02); opacity: 0.9; }

.photo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Placeholder gradient thumbnails */
.photo-placeholder-1 { background: linear-gradient(135deg, #173809 0%, #4a7c3f 100%); }
.photo-placeholder-2 { background: linear-gradient(135deg, #1a2e3a 0%, #3a6a8e 100%); }
.photo-placeholder-3 { background: linear-gradient(135deg, #2e1a0a 0%, #8e6a2a 100%); }
.photo-placeholder-4 { background: linear-gradient(135deg, #0a1a2e 0%, #1a4a6a 100%); }
.photo-placeholder-5 { background: linear-gradient(135deg, #1a2e1a 0%, #5a8a4a 100%); }
.photo-placeholder-6 { background: linear-gradient(135deg, #2e2a1a 0%, #8a7a3a 100%); }

.section-cta { text-align: center; }

.btn-outline {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  padding: 10px 28px;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.btn-outline:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ─── Footer ─────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--surface-container-low);
  border-top: 1px solid var(--outline-variant);
  padding: 32px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.footer-name {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--primary); }

.footer-copy {
  font-size: 0.775rem;
  color: var(--outline);
}

/* ─── Photography Page ───────────────────────────────────────────────── */
.photo-page-hero {
  background: var(--primary);
  padding: 64px 0 56px;
  text-align: center;
}
.photo-page-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 12px;
}
.photo-page-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  max-width: 480px;
  margin: 0 auto;
}

.photo-masonry {
  columns: 3;
  column-gap: 10px;
  padding: 32px 0;
}
.photo-masonry-item {
  break-inside: avoid;
  margin-bottom: 10px;
  border-radius: var(--radius);
  overflow: hidden;
  display: block;
}
.photo-masonry-item img {
  width: 100%;
  display: block;
  transition: transform 0.3s ease;
}
.photo-masonry-item:hover img { transform: scale(1.02); }

.photo-masonry-placeholder {
  break-inside: avoid;
  margin-bottom: 10px;
  border-radius: var(--radius);
  overflow: hidden;
}

/* ─── Lightbox ───────────────────────────────────────────────────────── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 90vw;
  max-height: 88vh;
  object-fit: contain;
  border-radius: 3px;
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 24px;
  color: rgba(255,255,255,0.7);
  font-size: 1.75rem;
  cursor: pointer;
  background: none;
  border: none;
  line-height: 1;
  transition: color var(--transition);
}
.lightbox-close:hover { color: #fff; }

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--primary);
    padding: 16px 24px;
    gap: 4px;
  }
  .nav-toggle { display: flex; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }
  .hero-photo img, .hero-photo .photo-placeholder { margin: 0 auto; }
  .hero-name { font-size: 2.1rem; }
  .hero-affiliation { justify-content: center; }
  .hero-links { justify-content: center; }

  .work-grid { grid-template-columns: 1fr; }
  .work-card.featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
  .work-card.featured .work-card-image { height: 160px; }

  .about-grid { grid-template-columns: 1fr; text-align: center; }
  .about-grid .photo-placeholder,
  .about-photo img { width: 200px; margin: 0 auto; }
  .timeline-item { flex-direction: column; gap: 6px; }
  .timeline-date { width: auto; }

  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .photo-masonry { columns: 2; }

  .section { padding: 56px 0; }
  .section-title { font-size: 1.65rem; }
  .page-header h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .photo-grid { grid-template-columns: 1fr 1fr; }
  .photo-masonry { columns: 1; }
}