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

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: #333;
  background: #fafafa;
}

a {
  color: #2a6496;
  text-decoration: none;
}

a:hover {
  color: #1a4060;
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4 {
  color: #222;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
h2 { font-size: 1.4rem; margin: 2rem 0 0.75rem; border-bottom: 1px solid #ddd; padding-bottom: 0.3rem; }
h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; color: #444; }

p, ul, ol {
  margin-bottom: 1rem;
}

/* ===== Layout ===== */
.site-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Navigation ===== */
.site-nav {
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav .nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-nav .nav-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: #222;
  text-decoration: none;
}

.site-nav .nav-name:hover {
  text-decoration: none;
  color: #2a6496;
}

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

.site-nav .nav-links a {
  font-size: 0.9rem;
  color: #555;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav .nav-links a:hover,
.site-nav .nav-links a.active {
  color: #2a6496;
  border-bottom-color: #2a6496;
  text-decoration: none;
}

/* ===== Header / Hero ===== */
.page-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid #e0e0e0;
}

.page-header .avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.header-info {
  flex: 1;
}

.header-info .subtitle {
  color: #666;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.academic-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.academic-links a img {
  width: 1.8em;
  height: 1.8em;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.academic-links a:hover img {
  opacity: 1;
}

/* ===== Main Content ===== */
main {
  padding: 1.5rem 0 3rem;
}

/* ===== Section Cards (Projects) ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 1.25rem;
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 0.75rem;
}

.card .card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card .card-links a img {
  height: 20px;
}

/* ===== Highlight Cards (index) ===== */
.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.highlight-card {
  background: #fff;
  border-left: 3px solid #2a6496;
  padding: 1rem 1.25rem;
  border-radius: 0 4px 4px 0;
}

.highlight-card .journal {
  font-size: 0.85rem;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}

.highlight-card .hl-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #222;
  margin-bottom: 0.25rem;
}

.highlight-card .hl-year {
  font-size: 0.85rem;
  color: #666;
}

/* ===== Publications Page ===== */
.pub-year {
  font-size: 1.1rem;
  color: #2a6496;
  margin: 2rem 0 0.75rem;
  font-weight: 600;
}

.pub-list {
  list-style: none;
  padding: 0;
}

.pub-list > li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 0.92rem;
  line-height: 1.55;
}

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

.pub-list .pub-badges {
  margin-top: 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.pub-list .pub-badges img {
  height: 20px;
}

.pub-list .pub-note {
  font-size: 0.85rem;
  color: #666;
  margin-top: 0.3rem;
}

.pub-cover {
  max-width: 300px;
  margin: 0.75rem 0;
  border-radius: 4px;
}

/* ===== CV Page ===== */
.cv-section {
  margin-bottom: 2rem;
}

.cv-entry {
  padding: 0.5rem 0;
  border-left: 2px solid #ddd;
  padding-left: 1rem;
  margin-bottom: 0.75rem;
}

.cv-entry .cv-period {
  font-size: 0.85rem;
  color: #888;
  font-weight: 600;
}

.cv-entry .cv-title {
  font-weight: 600;
  color: #222;
}

.cv-entry .cv-detail {
  font-size: 0.9rem;
  color: #555;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid #e0e0e0;
  padding: 1.5rem 0;
  text-align: center;
  color: #888;
  font-size: 0.85rem;
}

.site-footer .funding-logos {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
}

.site-footer .funding-logos img {
  height: 50px;
  opacity: 0.7;
}

/* ===== Language Toggle ===== */
.lang-toggle {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.lang-btn {
  background: none;
  border: 1px solid #ccc;
  padding: 0.15rem 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  color: #888;
  border-radius: 3px;
  font-weight: 500;
  transition: all 0.2s;
}

.lang-btn.active {
  background: #2a6496;
  color: #fff;
  border-color: #2a6496;
}

.lang-btn:hover:not(.active) {
  border-color: #2a6496;
  color: #2a6496;
}

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

  .page-header .avatar {
    width: 120px;
    height: 120px;
  }

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

  .site-nav .nav-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav .nav-links {
    gap: 1rem;
    flex-wrap: wrap;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.2rem; }

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