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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f7f9fc;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background-color: #2c3e50;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo a {
  color: #fff;
  font-size: 1.5rem;
  font-weight: bold;
  text-decoration: none;
}

.main-nav ul {
  display: flex;
  list-style: none;
}

.main-nav li {
  margin-left: 1.5rem;
}

.main-nav a {
  color: #ecf0f1;
  text-decoration: none;
  transition: color 0.3s;
}

.main-nav a:hover {
  color: #3498db;
}

/* Main content */
main {
  padding: 2rem 0;
}

h1 {
  margin-bottom: 1.5rem;
  color: #2c3e50;
}

h2, h3, h4 {
  margin: 1.5rem 0 1rem;
  color: #2c3e50;
}

p {
  margin-bottom: 1rem;
}

a {
  color: #3498db;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Card layout for projects and papers */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card-content {
  padding: 1.5rem;
}

.card-title {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.card-meta {
  color: #7f8c8d;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

/* Footer */
.site-footer {
  background-color: #2c3e50;
  color: #ecf0f1;
  padding: 1.5rem 0;
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header .container {
    flex-direction: column;
    text-align: center;
  }
  
  .main-nav {
    margin-top: 1rem;
  }
  
  .main-nav ul {
    justify-content: center;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}