:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7f9;
  --color-text: #2b2d33;
  --color-text-muted: #6b7280;
  --color-accent: #2f5d9f;
  --color-border: #e5e7eb;
  --font-sans: 'Source Sans 3', sans-serif;
  --font-serif: 'Source Serif 4', serif;
  --max-width: 860px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.nav-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.nav-logo {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--color-accent);
}

/* Hero */
.hero {
  padding: 3.5rem 1.5rem 2.5rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.hero-photo {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.photo-placeholder {
  display: none;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
}

.hero-text h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  margin: 0 0 0.4rem;
}

.hero-role {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: 0 0 0.6rem;
}

.hero-affiliation {
  color: var(--color-text-muted);
  margin: 0 0 0.5rem;
}

.hero-location {
  margin: 0 0 0.9rem;
  color: var(--color-text-muted);
}

.hero-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-links a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--color-accent);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  transition: all 0.15s ease;
}

.hero-links a:hover {
  background: var(--color-accent);
  color: #fff;
}

/* Sections */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-child {
  border-bottom: none;
}

.section h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  margin: 0 0 1.2rem;
  color: var(--color-text);
}

.section p {
  margin: 0 0 1rem;
}

/* Timeline (Education / Experience) */
.timeline-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1.5rem;
  margin-bottom: 1.6rem;
}

.timeline-date {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.9rem;
  white-space: nowrap;
}

.timeline-content h3 {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
}

.timeline-content .org {
  font-weight: 600;
  color: var(--color-text-muted);
  margin: 0 0 0.4rem;
}

.timeline-content p {
  margin: 0;
  font-size: 0.96rem;
}

.timeline-content p.org {
  font-size: 0.96rem;
}

/* Publications */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.pub-item {
  padding: 1rem 1.2rem;
  background: var(--color-bg-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.pub-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  font-family: var(--font-serif);
}

.pub-authors {
  margin: 0 0 0.3rem;
  font-size: 0.92rem;
}

.pub-venue {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Projects */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.project-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.project-item p {
  margin: 0;
  font-size: 0.96rem;
}

/* Awards */
.awards-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.awards-list li {
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.96rem;
}

.awards-list li:last-child {
  border-bottom: none;
}

.award-year {
  display: inline-block;
  min-width: 3.2rem;
  font-weight: 700;
  color: var(--color-accent);
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
}

.skill-category h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--color-accent);
}

.skill-category p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  text-align: center;
  color: var(--color-text-muted);
}

.footer h2 {
  font-family: var(--font-serif);
  color: var(--color-text);
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
}

.footer p {
  margin: 0.2rem 0;
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-note {
  margin-top: 1.2rem;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 640px) {
  .hero-content {
    flex-direction: column;
    text-align: center;
  }

  .hero-links {
    justify-content: center;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}