:root {
  /* Colors */
  --body-bgcolour: #f4f4f4;
  --header-bgcolour: #009dc4;
  --primary-color: #009dc4;
  --primary-color-dark: #007da1;
  --text-color: #333;
  --link-color: #007da1;
  --answer-color: red;
  --padding-base: 1rem;
  --padding-large: 2rem;
  --gap-base: 1rem;
  --gap-small: 0.5rem;
  --max-width: 700px;
  --font-family-base: sans-serif;
  --font-size-base: 1rem;
  --font-size-large: 1.3rem;
  --font-size-xlarge: 2rem;
  --border-radius: 5px;
}

body {
  font-family: var(--font-family-base);
  line-height: 1.6;
  background: var(--body-bgcolour);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--padding-large) var(--padding-base);
}

header {
  background-color: var(--header-bgcolour);
  color: white;
  padding: var(--padding-base) var(--padding-large);
  width: 100%;
  text-align: center;
}

header h1 {
  font-size: var(--font-size-xlarge);
  font-weight: bold;
  margin: 0;
  letter-spacing: 0.5px;
}

main {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--padding-large);
}

.button-group {
  display: flex;
  gap: var(--gap-base);
  justify-content: center;
  flex-wrap: wrap;
}

#pluralButton {
  margin-left: 70px;
  margin-right: 70px;
}

.button-group button,
#ansButton,
#genButton {
  background-color: var(--primary-color);
  color: white;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  flex: 1 1 45%;
  min-width: 140px;
  text-align: center;
  font-size: var(--font-size-base);
}

.button-group button:hover,
#ansButton:hover,
#genButton:hover {
  background-color: var(--primary-color-dark);
}

.numBox {
  text-align: center;
  font-size: var(--font-size-large);
  font-weight: bold;
  margin: var(--padding-base) 0;
  word-break: break-word;
}

#displayCase {
  text-align: center;
  font-style: italic;
  margin-bottom: var(--padding-base);
}

form {
  display: flex;
  justify-content: center;
  margin-bottom: var(--padding-base);
}

#input {
  width: 100%;
  max-width: 500px;
  padding: 0.5rem;
  font-size: var(--font-size-base);
  resize: none;
}

#ansButton,
#genButton {
  display: inline-block;
  margin: 0.5rem auto;
}

#countBox,
#streakBox {
  text-align: center;
  font-weight: bold;
  hyphens: manual;
  overflow-wrap: anywhere;
}

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

details li {
  margin-bottom: var(--gap-small);
}

@media (min-width: 768px) {
  .button-group button,
  #ansButton,
  #genButton {
    flex: 1 1 40%;
  }
}

.case-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  justify-content: space-between;
}

.case-list li {
  width: 48%;
  text-align: left;
}

@media (max-width: 500px) {
  .case-list li {
    width: 100%; 
  }
}

#customRangeInputs {
  display: flex;
  gap: var(--gap-small);
  margin-top: var(--gap-small);
  flex-direction: column;
  align-items: flex-start;
}

#customRangeInputs input {
  flex: 1;
  padding: 0.4rem;
  width: 100%;
  max-width: 120px;
}

@media (min-width: 500px) {
  #customRangeInputs {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }
}

.red-word {
  color: var(--answer-color);
  font-weight: bold;
}

.visually-hidden {
  display: none !important;
}