.gemdas-calculator {
  max-width: 600px;
  margin: auto;
  padding: 20px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  font-family: 'Segoe UI', sans-serif;
  color: #333;
}

.dark-mode {
  background: #1e1e1e;
  color: #eee;
}

.dark-mode input {
  background: #2b2b2b;
  color: #fff;
}

h2, h3 {
  text-align: center;
  color: #F43676;
}

.form-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
}

input {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
  margin-bottom: 10px;
  font-size: 18px;
}

button {
  background-color: #F43676;
  color: white;
  border: none;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
  font-size: 18px;
  flex: 1;
  margin: 3px;
}

button:hover {
  background-color: #c22c5e;
}

.theme-toggle {
  text-align: center;
  margin-bottom: 15px;
}

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

.keypad .row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 5px;
}

.results {
  margin-top: 20px;
}

#steps {
  margin-top: 10px;
  padding-left: 20px;
}

#history {
  list-style-type: decimal;
  padding-left: 20px;
}

#history li {
  margin-bottom: 5px;
}