h1 {
  /* reduce bottom padding */
  margin-top: 20px;
  margin-bottom: 0px;
}

body {
  font-family: Arial, sans-serif;
  max-width: 600px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.form-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.form-group {
  flex: 1;
  margin-right: 10px;
}

.form-group:last-child {
  margin-right: 0;
}

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

input[type="number"],
input[type="text"] {
  width: 100%;
  padding: 5px;
  box-sizing: border-box;
}

button {
  margin-top: 20px;
  padding: 10px;
  background-color: #4caf50;
  color: white;
  border: none;
  cursor: pointer;
  width: 100%;
}

#result {
  margin-top: 20px;
}

.abilities {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.ability-column {
  flex: 1;
}

.ability-option {
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}

.ability-option input[type="checkbox"] {
  margin-right: 5px;
}

.calculation,
.final-result,
.effects {
  margin-top: 10px;
  padding: 10px;
  background-color: #f0f0f0;
  border-radius: 5px;
}

.final-result {
  font-weight: bold;
  margin-top: 20px;
}

.disabled {
  opacity: 0.5;
  pointer-events: none;
  /* strike through */
  text-decoration: line-through;
}

.effects ul {
  margin: 0;
  padding-left: 20px;
}

.effects li {
  margin-bottom: 5px;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 95vh;
}

main {
  flex: 1 0 auto;
}

footer {
  flex-shrink: 0;
  padding: 10px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 50px;
}