:root {
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --text-color: #333;
  --link-color: #2c6fbb;
  --muted-color: #666;
  --border-color: #eee;
  --bg-color: #fff;
  --max-width: 900px;
}

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

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-color);
}
.site-title:hover { text-decoration: none; }

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--muted-color);
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-links a.active,
.nav-links a:hover {
  color: var(--text-color);
}

/* About page */
.about .profile {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.profile-image img {
  width: 100%;
  border-radius: 50%;
}
.profile-image img.circular { border-radius: 50%; }

.more-info {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted-color);
  line-height: 1.6;
}

.social-links {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.75rem;
  font-size: 0.9rem;
}

.profile-text h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.profile-text .subtitle {
  color: var(--muted-color);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.bio p {
  margin-bottom: 0.75rem;
}

/* Publications */
.publications {
  margin-bottom: 1rem;
}

.pub-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.25rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  align-items: start;
}

.pub-thumbnail img {
  width: 100%;
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  line-height: 1.4;
}
.pub-title a { color: var(--text-color); }
.pub-title a:hover { color: var(--link-color); }

.pub-authors {
  font-size: 0.88rem;
  color: var(--muted-color);
  margin-bottom: 0.2rem;
}

.pub-venue {
  font-size: 0.88rem;
  margin-bottom: 0.3rem;
}

.pub-link {
  font-size: 0.82rem;
  font-weight: 500;
  margin-right: 0.5rem;
}

/* Page */
.page h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.page-description {
  color: var(--muted-color);
  margin-bottom: 2rem;
}

.page h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border-color);
}

/* Photography - masonry layout */
.photo-masonry {
  column-count: 3;
  column-gap: 0.75rem;
  margin-top: 1.5rem;
}

.photo-masonry figure {
  margin: 0 0 0.75rem;
  break-inside: avoid;
  overflow: hidden;
  border-radius: 6px;
}

.photo-masonry img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}

.photo-masonry figure:hover img {
  transform: scale(1.02);
}

@media (max-width: 900px) {
  .photo-masonry { column-count: 2; }
}

@media (max-width: 480px) {
  .photo-masonry { column-count: 1; }
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.92);
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox.active {
  display: flex;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
}

/* Section blocks */
.section-block {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.section-block h2 {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

/* Experience timeline */
.timeline {
  position: relative;
  display: grid;
  gap: 1rem;
  --date-width: 10rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0.75rem;
  bottom: 0.75rem;
  left: calc(var(--date-width) + 0.3rem);
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--link-color) 10%, var(--link-color) 90%, transparent);
}

.timeline-item {
  display: grid;
  grid-template-columns: var(--date-width) 1rem 1fr;
  gap: 0.75rem;
  align-items: start;
  position: relative;
}

.timeline-dot {
  position: relative;
  top: 0.55rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--link-color);
  border: 2px solid var(--bg-color);
  box-shadow: 0 0 0 2px var(--link-color);
  justify-self: center;
}

.timeline-date {
  align-self: start;
  text-align: right;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--link-color);
  background: rgba(44, 111, 187, 0.08);
  border: 1px solid rgba(44, 111, 187, 0.2);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  white-space: nowrap;
  margin-top: 0.3rem;
}

.timeline-card {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.timeline-role {
  font-weight: 600;
  font-size: 0.95rem;
}

.timeline-org {
  font-size: 0.88rem;
  color: var(--muted-color);
  margin-top: 0.15rem;
}

@media (max-width: 640px) {
  .timeline { --date-width: 0; }
  .timeline::before { left: 0.3rem; }
  .timeline-item { grid-template-columns: 1rem 1fr; }
  .timeline-date {
    grid-column: 2;
    justify-self: start;
    text-align: left;
  }
  .timeline-card { grid-column: 2; }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted-color);
  font-size: 0.85rem;
  margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .about .profile {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .profile-image {
    max-width: 180px;
    margin: 0 auto;
  }
  .more-info, .social-links { justify-content: center; }
  .pub-entry {
    grid-template-columns: 100px 1fr;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .pub-entry {
    grid-template-columns: 1fr;
  }
  .pub-thumbnail { display: none; }
}