body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f8f8f8;
  color: #333;
  padding: 2rem;
  line-height: 1.6;
}

h2 {
  margin-top: 2rem;
  color: #2c3e50;
}

section {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 8px;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
}

input,
select {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
  font-size: 1rem;
  border-radius: 4px;
  border: 1px solid #aaa;
  box-sizing: border-box;
}

input:focus,
select:focus {
  outline: none;
  border-color: #007acc;
}

.grid-2,
.grid-4 {
  display: grid;
  gap: 1rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background-color: #007acc;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #005fa3;
}

#result {
  font-size: 1.1rem;
  font-weight: bold;
  background: #eafaf1;
  padding: 1rem;
  border: 1px solid #b2e0c4;
  border-radius: 6px;
}