body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: #1f2a1f;
}

.nav {
  position: absolute;
  top: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 20px 40px;
  z-index: 2;
  color: white;
}

.nav a {
  color: white;
  margin-left: 20px;
  text-decoration: none;
}

.logo {
  font-weight: bold;
  font-size: 20px;
}

.hero {
  height: 90vh;
  background: url('https://images.unsplash.com/photo-1500595046743-cd271d694d30');
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
}

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
}

.hero-content {
  position: relative;
  max-width: 800px;
}

.hero-content h1 {
  font-size: 48px;
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 24px;
  background: #2f6b2f;
  color: white;
  text-decoration: none;
}

.section {
  padding: 80px 20px;
  text-align: center;
}

.dark {
  background: #f3f6f1;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: auto;
}

.card {
  background: white;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

footer {
  padding: 30px;
  text-align: center;
  background: #1f2a1f;
  color: white;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 80px;
  background: #0f2d1f;
  box-sizing: border-box;
}

.logo {
  color: white;
  font-size: 22px;
  font-weight: bold;
  letter-spacing: 2px;
  flex-shrink: 0;
}

.nav {
  display: flex;
  gap: 15px;
  margin-left: auto;
}
.nav-link {
  color: white;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 25px;
  transition: 0.3s;
  font-weight: 500;
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-link:hover {
  background: #1f5c3d;
  border-color: #3aa76d;
  transform: translateY(-2px);
}

.nav-link.active {
  background: #3aa76d;
  color: white;
}