body {
  font-family: Arial, sans-serif;
  background: #EAF6FF;
  color: #023047;
  margin: 0;
  padding: 0;
}

header {
  background: #0077B6;
  color: white;
  padding: 1rem;
  text-align: center;
}

nav button {
  background: #90E0EF;
  border: none;
  margin: 0 5px;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
}

nav button.active {
  background: #0077B6;
  color: white;
  font-weight: bold;
}

section {
  display: none;
  padding: 1rem;
}

section.active {
  display: block;
}

.input-group {
  margin-bottom: 1rem;
}

input, textarea {
  padding: 0.5rem;
  margin: 0.3rem 0;
  border-radius: 6px;
  border: 1px solid #ccc;
  width: 100%;
}

button {
  background: #0077B6;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: #CAF0F8;
  margin: 0.5rem 0;
  padding: 0.5rem;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.note-card {
  background: #ADE8F4;
  padding: 1rem;
  margin: 0.5rem 0;
  border-radius: 8px;
}