/* 1. Use a more-intuitive box-sizing model */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* 2. Remove default margin */
*:not(dialog) {
  margin: 0;
}

/* 3. Enable keyword animations */
@media (prefers-reduced-motion: no-preference) {
  html {
    interpolate-size: allow-keywords;
  }
}

body {
  /* 4. Add accessible line-height */
  line-height: 1.5;
  /* 5. Improve text rendering */
  -webkit-font-smoothing: antialiased;
}

/* 6. Improve media defaults */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

/* 7. Inherit fonts for form controls */
input,
button,
textarea,
select {
  font: inherit;
}

/* 8. Avoid text overflows */
p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* 9. Improve line wrapping */
p {
  text-wrap: pretty;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  text-wrap: balance;
}

/*
  10. Create a root stacking context
*/
#root,
#__next {
  isolation: isolate;
}

:root {
  /* --- Colors --- */
  --purple-500: hsl(259, 100%, 65%);
  --red-400: hsl(0, 100%, 67%);

  /* Neutrals */
  --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%, 0%);

  /* --- Typography --- */
  --ff-primary: "Poppins", sans-serif;

  /* Font Weights */
  --fw-bold: 700;
  --fw-extrabold: 800;
  --fw-regular: 400;

  /* Typography Presets */
  /* Note: Using rem is better for accessibility. 16px = 1rem */

  /* Preset 1 */
  --fs-100: 104px;
  --lh-100: 1.1;
  --ls-100: -2px;

  /* Preset 2 */
  --fs-200: 56px;
  --lh-200: 1.1;
  --ls-200: -2px;

  /* Preset 3 */
  --fs-300: 32px;
  --lh-300: 1.5;
  --ls-300: 0px;

  /* Preset 4 */
  --fs-400: 20px;
  --lh-400: 1.5;
  --ls-400: 0px;

  /* Preset 5 */
  --fs-500: 14px;
  --lh-500: 1.5;
  --ls-500-bold: 5px;

  /* Preset 6 */
  --fs-600: 12px;
  --lh-600: 1.5;
  --ls-600-bold: 4px;
  /* --- Typography Presets (Font Shorthand) --- */

  /* Preset 1 — 104px ExtraBold Italic */
  --tp-1-font: italic var(--fw-extrabold) 10.4rem / 1.1 var(--ff-primary);
  --tp-1-ls: -0.2rem;

  /* Preset 2 — 56px ExtraBold Italic */
  --tp-2-font: italic var(--fw-extrabold) 5.6rem / 1.1 var(--ff-primary);
  --tp-2-ls: -0.2rem;

  /* Preset 3 — 32px Bold */
  --tp-3-font: var(--fw-bold) 3.2rem / 1.5 var(--ff-primary);
  --tp-3-ls: 0;

  /* Preset 4 — 20px Bold */
  --tp-4-font: var(--fw-bold) 2rem / 1.5 var(--ff-primary);
  --tp-4-ls: 0;

  /* Preset 5 Bold — 14px Bold */
  --tp-5-bold-font: var(--fw-bold) 1.4rem / 1.5 var(--ff-primary);
  --tp-5-bold-ls: 0.5rem;

  /* Preset 5 Italic — 14px Italic */
  --tp-5-italic-font: italic var(--fw-regular) 1.4rem / 1.5 var(--ff-primary);
  --tp-5-italic-ls: 0;

  /* Preset 6 Bold — 12px Bold */
  --tp-6-bold-font: var(--fw-bold) 1.2rem / 1.5 var(--ff-primary);
  --tp-6-bold-ls: 0.4rem;

  /* Preset 6 Italic — 12px Italic */
  --tp-6-italic-font: italic var(--fw-regular) 1.2rem / 1.5 var(--ff-primary);
  --tp-6-italic-ls: 0;

  /* --- Spacing System --- */
  --space-0: 0px;
  --space-100: 8px;
  --space-200: 16px;
  --space-300: 24px;
  --space-400: 32px;
  --space-600: 48px;
  --space-700: 56px;
}
html {
  font-size: 62.5%;
}
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--ff-primary);
  background: var(--grey-100);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding-inline: 1.6rem;
}
.container {
  padding: var(--space-600) var(--space-300);
  display: flex;
  flex-direction: column;
  gap: var(--space-400);
  background: var(--white);
  border-radius: var(--space-300);
  border-bottom-right-radius: 10rem;
  max-width: 34.3rem;
}
.date-field {
  display: flex;
  gap: var(--space-200);
}
.date-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-100);
}
.date-item label {
  color: var(--grey-500);
  font: var(--tp-6-bold-font);
  letter-spacing: var(--tp-6-bold-ls);
  text-transform: uppercase;
  cursor: pointer;
}
.date-item input {
  padding: var(--space-100) var(--space-200);
  width: 100%;
  min-width: 8.8rem;
  border: 1px solid var(--grey-200);
  border-radius: var(--space-100);
  color: var(--black);
  font: var(--tp-4-font);
  letter-spacing: var(--tp-4-ls);
  cursor: pointer;
  outline: none;
}
.date-item input:focus {
  border-color: var(--purple-500);
  color: var(--purple-500);
}
.date-item .error-message {
  font: var(--tp-6-italic-font);
  letter-spacing: var(--tp-6-italic-ls);
  color: var(--red-400);
  display: none;
}
.middle-container {
  height: 6.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}
.middle-container .arrow-btn {
  background: var(--purple-500);
  border-radius: 50%;
  height: 100%;
  aspect-ratio: 1/1;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  z-index: 3;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
}
.middle-container .arrow-btn svg {
  width: 2.4rem;
  height: 2.4rem;
  aspect-ratio: 1/1;
}
.arrow-btn:active,
.arrow-btn:hover,
.arrow-btn:focus {
  background: #000;
}
.middle-container hr {
  background: var(--grey-200);
  width: 100%;
  height: 2px;
  border: none;
  position: absolute;
  top: 50%;
  z-index: 2;
}
.age-container h2 {
  font: var(--tp-2-font);
  letter-spacing: var(--tp-2-ls);
}
.age-container span {
  color: var(--purple-500);
  margin-right: var(--space-100);
}
/* Error State */
.error-state {
  label {
    color: var(--red-400);
  }
  input {
    border-color: var(--red-400);
  }
  .error-message {
    color: var(--red-400);
    display: block;
  }
}
@media (min-width: 768px) {
  .container {
    padding: var(--space-700);
    max-width: 686px;
    border-bottom-right-radius: 20rem;
  }
  .date-field {
    gap: var(--space-400);
  }
  .date-item {
    gap: var(--space-100);
  }
  .date-item label {
    font: var(--tp-5-bold-font);
    letter-spacing: var(--tp-5-bold-ls);
  }
  .date-item input {
    padding: var(--space-100) var(--space-300);
    min-width: 17rem;
    font: var(--tp-3-font);
    letter-spacing: var(--tp-3-ls);
  }
  .date-item .error-message {
    font: var(--tp-5-italic-font);
    letter-spacing: var(--tp-5-italic-ls);
  }

  .middle-container {
    height: 9.6rem;
  }
  .middle-container .arrow-btn svg {
    width: 4.4rem;
    height: 4.4rem;
  }
  .age-container h2 {
    font: var(--tp-1-font);
    letter-spacing: var(--tp-1-ls);
  }
}
@media (min-width: 1440px) {
  .container {
    min-width: 86rem;
    gap: 0;
  }
  .date-field .date-item {
    width: 16rem;
  }
  .middle-container {
    justify-content: flex-end;
  }
}