body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  background: #f6f8f5;
  color: #1f2933;
  line-height: 1.6;
}

.container {
  max-width: 1050px;
  margin: 0 auto;
  padding: 24px;
}

header {
  background: linear-gradient(135deg, #1f3d2b, #355e3b);
  color: white;
  padding: 60px 24px;
}

header h1 {
  font-size: 3rem;
  margin: 0 0 10px 0;
}

header p {
  font-size: 1.15rem;
  max-width: 850px;
}

nav {
  background: white;
  border-bottom: 1px solid #ddd;
  position: sticky;
  top: 0;
  z-index: 10;
}

nav .container {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  color: #1f3d2b;
  font-weight: bold;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

.button-row {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  background: white;
  color: #1f3d2b;
  padding: 10px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
}

.button:hover {
  background: #e9f1ea;
}

section {
  margin: 44px 0;
}

h2 {
  color: #1f3d2b;
  border-bottom: 2px solid #d9e2d8;
  padding-bottom: 8px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 10px;
  border: 1px solid #e1e5e0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.card h3 {
  margin-top: 0;
  color: #1f3d2b;
}

.publication {
  background: white;
  border: 1px solid #e1e5e0;
  border-left: 5px solid #355e3b;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.publication h3 {
  margin-top: 0;
}

.publication a {
  color: #174ea6;
}

.keywords {
  color: #555;
  font-size: 0.95rem;
}

footer {
  background: #1f3d2b;
  color: white;
  padding: 30px 24px;
  margin-top: 50px;
}

footer a {
  color: white;
}