/* CSS Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-family: "Poppins", sans-serif;
  --font-size-xs: 0.625rem;
  --font-size-sm: 0.75rem;
  --font-size-md: 1.25rem;
  --font-size-lg: 2.5rem;
  --font-size-xl: 4.5rem;

  /* Colors */
  --purple-500: hsl(259, 100%, 65%);
  --red-400: hsl(0, 100%, 67%);
  --white: hsl(0, 100%, 100%);
  --grey-100: hsl(0, 0%, 94%);
  --grey-200: hsl(0, 0%, 86%);
  --grey-500: hsl(0, 1%, 44%);
  --black: hsl(0, 0%, 8%);

  --spacing-sm: 0.25rem;
  --spacing-md: 0.5rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;

  --card-radius-mobile: 1rem 1rem 5rem 1rem;
  --card-radius-desktop: 1.5rem 1.5rem 9rem 1.5rem;
  --radius-sm: 0.5rem;

  --shadow-sm: 0 1rem 2rem rgba(0, 0, 0, 0.1);
}

body {
  font-family: var(--font-family);
  background-color: var(--grey-100);
  color: var(--black);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Mobile Styles */
.age-calculator {
  background-color: var(--white);
  padding: 2.5rem 1rem;
  border-radius: var(--card-radius-mobile);
  width: 100%;
  max-width: 20rem;
  box-shadow: var(--shadow-sm);
}

.age-calculator__form {
  display: flex;
  flex-direction: column;
}

.age-calculator__inputs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  border: none;
}

.age-calculator__input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.age-calculator__label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--grey-500);
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

.age-calculator__input {
  font-size: var(--font-size-md);
  font-weight: 700;
  padding: 0.65rem;
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-sm);
  color: var(--black);
  outline: none;
  width: 100%;
}

.age-calculator__input:focus {
  border-color: var(--purple-500);
}

.age-calculator__error {
  font-size: var(--font-size-xs);
  font-style: italic;
  color: var(--red-400);
  margin-top: var(--spacing-md);
  min-height: 1rem;
}

.age-calculator__divider {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.age-calculator__line {
  border: none;
  height: 1px;
  background-color: var(--grey-200);
  width: 100%;
}

.age-calculator__submit {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  bottom: -1.5rem;
  z-index: 2;
  background-color: var(--purple-500);
  border: none;
  padding: 1rem;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.age-calculator__submit:hover {
  background-color: var(--black);
}

.age-calculator__icon {
  width: 1rem;
  height: 1rem;
}

.age-calculator__results {
  font-style: italic;
  font-size: var(--font-size-lg);
  font-weight: 800;
  line-height: 1.1;
}

.age-calculator__result {
  display: flex;
  gap: var(--spacing-md);
}

.age-calculator__value {
  color: var(--purple-500);
}

.age-calculator__input.input-error {
  border-color: var(--red-400);
}

.age-calculator__label.label-error {
  color: var(--red-400);
}

/* Desktop Styles */
@media (min-width: 48rem) {
  .age-calculator {
    padding: 3rem;
    max-width: 40rem;
    border-radius: var(--card-radius-desktop);
  }

  .age-calculator__inputs {
    max-width: 25rem;
    gap: var(--spacing-lg);
  }

  .age-calculator__input {
    padding: 1rem;
  }

  .age-calculator__results {
    font-size: var(--font-size-xl);
  }

  .age-calculator__submit {
    padding: 1.25rem;
    right: 0;
    bottom: -2rem;

  }

  .age-calculator__icon {
    width: 1.5rem;
    height: 1.5rem;
  }
}