body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  font-size: 16px;
  background-color: #f4f4f4;
  color: #2e7d32; /* Dark green text */
}

header {
  display: flex;
  flex-direction: column; /* stack vertically */
  align-items: center;    /* center horizontally */
  background-color: #a5d6a7; /* light green background */
  color: #1b5e20;           /* dark green text */
  padding: 20px;
}

header img {
  height: 60px;
  margin-bottom: 10px;
}

h1 {
  font-size: 2em;
  margin: 0;
  color: #1b5e20;
}

main h2 {
  text-align: center;
  margin: 20px 0;
  font-size: 1.3em;
  color: #388e3c; /* medium green */
}

.title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  gap: 12px;
  flex-wrap: wrap;
}

.title-bar h2 {
  margin: 0;
  color: #1b5e20;
}

.nav-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-btn {
  padding: 8px 14px;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.3s ease;
  font-size: 0.9em;
  text-decoration: none;
  display: inline-block;
}

.nav-btn:hover {
  background-color: #388e3c;
}

.nav-btn.active {
  background-color: #1b5e20;
  cursor: default;
  opacity: 0.9;
}

.nav-btn.active:hover {
  background-color: #1b5e20;
}

.index-buttons {
  margin: 20px;
  display: flex;
  justify-content: center;
  gap: 10px;
}

.index-buttons button {
  padding: 10px 20px;
  font-size: 1em;
  background-color: #4caf50; /* green */
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.index-buttons button:hover {
  background-color: #388e3c; /* darker green */
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #1b5e20; /* dark green */
  color: white;
  margin-top: 40px;
  font-size: 0.9em;
}