body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}

/* Navigation */
nav {
  background: #003366;
  padding: 0.5rem;
}
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}
nav ul li {
  margin: 0 1rem;
}
nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
nav ul li a:hover {
  text-decoration: underline;
}

/* Header */
header {
  background: #00509e;
  color: white;
  text-align: center;
  padding: 2rem;
}
header h1 {
  margin: 0.5rem 0;
}
.profile-pic {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
  border: 3px solid white;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

/* Main */
main {
  max-width: 960px;
  margin: auto;
  padding: 2rem;
  display: grid;
  gap: 1.35rem;
}
h2 {
  color: #003366;
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.3rem;
  margin-top: 2rem;
}
ul, ol {
  margin-left: 1.5rem;
}
a {
  color: #00509e;
}

.section-card {
  background: #ffffff;
  border: 1px solid #d6e0ec;
  border-radius: 12px;
  padding: 1.2rem 1.3rem;
  box-shadow: 0 8px 18px rgba(0, 51, 102, 0.07);
}

.section-card h2,
.projects-section h2 {
  margin-top: 0;
}

.section-intro {
  color: #2c3f53;
  margin: 0.4rem 0 0.85rem;
}

.interest-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.interest-grid li {
  margin: 0;
  background: #f4f9ff;
  border: 1px solid #d9e8f8;
  border-radius: 10px;
  padding: 0.58rem 0.72rem;
  color: #173c5e;
  font-weight: 600;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.subsection-card {
  background: linear-gradient(180deg, #fbfdff 0%, #f4f9ff 100%);
  border: 1px solid #d8e5f2;
  border-radius: 10px;
  padding: 0.95rem 1rem;
}

.subsection-card h3 {
  margin: 0 0 0.7rem;
  color: #0d2c4a;
}

.paper-list {
  margin: 0;
  padding-left: 1.1rem;
}

.paper-list li {
  margin-bottom: 0.65rem;
}

.paper-list li:last-child {
  margin-bottom: 0;
}

.talk-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.talk-list li {
  margin: 0 0 0.55rem;
  padding: 0.42rem 0.62rem;
  background: #f8fbff;
  border-left: 3px solid #d3e2f2;
  border-radius: 0 8px 8px 0;
}

.talk-list li:last-child {
  margin-bottom: 0;
}

.talk-list li a {
  text-decoration: none;
}

.timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline-list li {
  position: relative;
  margin: 0.1rem 0 0;
  padding: 0.45rem 0 0.45rem 1.05rem;
  border-left: 2px solid #d4e2f0;
}

.timeline-list li::before {
  content: "";
  position: absolute;
  left: -0.38rem;
  top: 0.88rem;
  width: 0.58rem;
  height: 0.58rem;
  border-radius: 50%;
  background: #00509e;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.6rem;
}

.contact-links a {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.24rem 0.64rem;
  border: 1px solid #d1e2f5;
  background: #edf5ff;
  color: #0f406f;
  font-weight: 600;
}

.contact-links a:hover {
  background: #ddeeff;
}

/* Current Projects */
.projects-intro {
  margin: 0.4rem 0 1.1rem;
  color: #2c3f53;
}

.project-grid {
  display: grid;
  gap: 1.2rem;
}

.project-card {
  background: #ffffff;
  border: 1px solid #d6e0ec;
  border-left: 5px solid #00509e;
  border-radius: 12px;
  padding: 1.2rem 1.3rem;
  box-shadow: 0 8px 18px rgba(0, 51, 102, 0.08);
  opacity: 0;
  transform: translateY(8px);
  animation: project-fade-in 0.6s ease forwards;
}

.project-card:nth-of-type(2) {
  animation-delay: 0.08s;
}

.featured-project {
  border-left-color: #0b7f6a;
  background: linear-gradient(140deg, #f9fcff 0%, #f1fbf8 100%);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.project-card h3 {
  margin: 0;
  font-size: 1.08rem;
  color: #0d2c4a;
  max-width: 38rem;
}

.project-years {
  background: #e8f1fb;
  color: #003366;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  white-space: nowrap;
}

.project-meta {
  margin: 0.15rem 0 0.15rem;
  color: #2b3b4d;
}

.project-description-row {
  display: block;
}

.project-description-row p {
  margin: 0;
}

.project-media {
  display: block;
  width: 280px;
  height: auto;
  float: right;
  margin: 0 0 0.45rem 0.8rem;
  border: 1px solid #d6e0ec;
  border-radius: 8px;
}

.project-media-right {
  width: 180px;
  float: right;
  margin: 0 0 0.45rem 0.8rem;
}

.project-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 0.8rem;
}

.project-tag {
  display: inline-block;
  padding: 0.18rem 0.56rem;
  border-radius: 999px;
  border: 1px solid #c9ebe2;
  background: #e8f7f3;
  color: #0a5c4e;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.project-highlights {
  margin: 0.1rem 0 0.7rem 1.2rem;
  padding: 0;
}

.project-highlights li {
  margin-bottom: 0.35rem;
}

.project-links {
  clear: both;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin: 0.2rem 0 0;
}

.project-links a {
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.project-links a:hover {
  border-bottom-color: currentColor;
}

.project-note {
  margin: 0.55rem 0 0;
  color: #33495e;
}

@keyframes project-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .project-card {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* Footer */
footer {
  background: #003366;
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}
footer p {
  margin: 0.2rem 0;
}
.last-updated {
  font-size: 0.9rem;
  opacity: 0.9;
}
footer a {
  color: #ffd700;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
  }
  .profile-pic {
    width: 120px;
    height: 120px;
  }
  .section-card {
    padding: 1rem;
  }
  .interest-grid,
  .split-grid {
    grid-template-columns: 1fr;
  }
  .project-card {
    padding: 1rem;
  }
  .project-card h3 {
    font-size: 1rem;
  }
  .project-card-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .project-description-row {
    display: block;
  }
  .project-media {
    width: 240px;
  }
}