/* IMPORTS */
@import url("https://fonts.googleapis.com/css2?family=Space+Mono:wght@700&display=swap");

/* CUSTOM PROPERTIES */
:root {
  /* colours */
  --black: #000;
  --white: #fff;

  --grey-600: #3d6666;
  --grey-550: #547878;
  --grey-500: #5e7a7d;
  --grey-400: #7f9d9f;
  --grey-300: #9ebbbd;
  --grey-200: #c5e4e7;
  --grey-50: #f3f9fa;

  --green-900: #00474b;
  --green-800: #085c61;
  --green-750: #0d686d;
  --green-400: #26c2ae;
  --green-200: #9fe8df;

  --orange-400: #e17052;

  /* spacing */
  --spacing-0: 0;
  --spacing-100: 8px;
  --spacing-200: 16px;
  --spacing-300: 24px;
  --spacing-400: 32px;
  --spacing-600: 48px;
  --spacing-1000: 80px;
  --spacing-1200: 96px;
  --spacing-1500: 120px;
  --spacing-1600: 128px;
}

/* RESET */
*,
*::before,
*::after,
*::placeholder {
  font-family: inherit;
  font-weight: inherit;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* BASE */
html {
  font-family: "Space Mono", monospace;
  font-weight: 700;
  font-size: 150%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
  background-color: var(--grey-200);
}

/* TYPOGRAPHY PRESETS */
.text-preset-1 {
  font-size: 2rem;
  line-height: 1.48;
  letter-spacing: -1px;
}

.text-preset-2 {
  font-size: clamp(1.333rem, 0.523rem + 2.532vw, 2rem);
  line-height: 1.47;
  letter-spacing: -0.67px;
}

.text-preset-3 {
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0;
}

.text-preset-4 {
  font-size: 0.84rem;
  line-height: 1.5;
  letter-spacing: 0;
}

.text-preset-5 {
  font-size: 0.66rem;
  line-height: 1.5;
  letter-spacing: 0;
}

.text-preset-6 {
  font-size: 0.55rem;
  line-height: 1.46;
  letter-spacing: 0;
}

/* LAYOUT */
header {
  display: flex;
  justify-content: center;
  padding: var(--spacing-600) 0;
}

main {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
}

/* COMPONENTS */

/* card */
.card {
  background-color: var(--white);
  border-radius: 20px;
  padding: var(--spacing-300);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-400);
}

/* inputs section */
.inputs label,
.inputs legend {
  color: var(--grey-500);
}

/* form */
.tip-calculator {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-300);
}

/* input group */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-100);
}

/* input wrapper */
.input-wrapper {
  display: flex;
  align-items: center;
  background-color: var(--grey-50);
  border-radius: 4px;
  padding: var(--spacing-100) var(--spacing-200);
  gap: var(--spacing-100);
}

.input-wrapper img {
  flex-shrink: 0;
}

.input-wrapper input {
  flex: 1;
  width: 100%;
  font-size: 1rem;
  text-align: right;
  background-color: transparent;
  border: none;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.input-wrapper input::placeholder {
  color: var(--green-900);
  opacity: 0.35;
}

.input-wrapper:focus-within {
  outline: 2px solid var(--green-400);
}

.input-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.error-message {
  color: var(--orange-400);
  font-size: 0.66rem;
  display: none;
}

.input-group.error .error-message {
  display: block;
}

.input-group.error .input-wrapper {
  outline: 2px solid var(--orange-400);
}

/* fieldset */
fieldset {
  border: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-200);
}

fieldset legend {
  grid-column: 1 / -1;
  padding-bottom: var(--spacing-100);
}

fieldset button,
fieldset input {
  border: none;
  border-radius: 4px;
  padding: var(--spacing-100) var(--spacing-300);
}

fieldset button {
  background-color: var(--green-900);
  color: var(--white);
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    color 0.15s ease;
}
fieldset button:focus-visible {
  outline: 2px solid var(--green-400);
  outline-offset: 2px;
}

fieldset button:hover {
  background-color: var(--green-200);
  color: var(--green-900);
}

fieldset button.active {
  background-color: var(--green-400);
  color: var(--green-900);
}

fieldset input {
  width: 100%;
  min-width: 0;
  font-size: 1rem;
  background-color: var(--grey-50);
  text-align: center;
}

fieldset input::placeholder {
  opacity: 1;
}

fieldset input:focus {
  outline: 2px solid var(--green-400);
}

/* results */
.results {
  background-color: var(--green-900);
  color: var(--white);
  padding: var(--spacing-300);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-400);
}

.results dl {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-400);
}

.results dl > div {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.results dt {
  color: var(--white);
}

.results dt span {
  color: var(--grey-400);
  display: block;
}

.results dd {
  color: var(--green-400);
}
.results button {
  width: 100%;
  text-transform: uppercase;
  border: none;
  border-radius: 4px;
  padding: var(--spacing-100) var(--spacing-300);
  background-color: var(--green-750);
  color: var(--green-800);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.results button:focus-visible {
  outline: 2px solid var(--green-200);
  outline-offset: 2px;
}

.results button.active {
  background-color: var(--green-400);
  color: var(--green-900);
}

.results button.active:hover {
  background-color: var(--green-200);
  color: var(--green-900);
}

/* MEDIA QUERIES */

/* tablet */
@media (min-width: 768px) {
  .card {
    margin: 0 var(--spacing-600) var(--spacing-600) var(--spacing-600);
    padding: var(--spacing-1000);
    box-shadow: 0px 32px 43px rgba(79, 166, 175, 0.2);
  }

  fieldset {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .results {
    padding: var(--spacing-600);
  }
}

/* desktop */
@media (min-width: 1024px) {
  .card {
    flex-direction: row;
    align-items: center;
    padding: var(--spacing-400);
    margin: 0;
    gap: var(--spacing-600);
  }

  .inputs,
  .results {
    flex: 1;
  }

  .tip-calculator {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-600);
  }

  fieldset button,
  fieldset input {
    padding: var(--spacing-100);
    font-size: 0.84rem;
  }

  .results {
    align-self: stretch;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-400);
  }

  .results button {
    margin-top: var(--spacing-1600);
  }
}