:root {
  /* Primary */
  --white: #ffffff;
  --black: #000000;

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

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

  /* Orange */
  --orange-400: #e17052;

  /* Typography - font: bold size/line-height "Space Mono", monospace */
  --text-preset-1: bold 3rem/4.4375rem "Space Mono", monospace;
  --text-preset-1-spacing: -0.0625rem;
  --text-preset-2: bold 2rem/2.9375rem "Space Mono", monospace;
  --text-preset-2-spacing: -0.0419rem;
  --text-preset-3: bold 1.5rem/2.25rem "Space Mono", monospace;
  --text-preset-4: bold 1.25rem/1.875rem "Space Mono", monospace;
  --text-preset-5: bold 1rem/1.5rem "Space Mono", monospace;
  --text-preset-6: bold 0.8125rem/1.1875rem "Space Mono", monospace;
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

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

header {
  margin-block-start: 2rem;
  margin-block-end: 2rem;
  /* font: var(--text-preset-4);
  letter-spacing: 0.5rem;
  color: var(--grey-600); */
}
h1 {
  font: var(--text-preset-4);
  letter-spacing: 0.5rem;
  color: var(--grey-600);
}
main {
  background-color: var(--white);
  width: 100%;
  padding: 1.5rem;
  border-radius: 25px 25px 0 0;
  display: flex;
  flex-direction: column;
}

input {
  width: 100%;
  /* height: 3rem; */
  line-height: 1.5;
  border: 0;
  background-color: var(--grey-50);
  padding-block-start: 0.5rem;
  padding-block-end: 0.5rem;
  padding-inline-start: 1rem;
  padding-inline-end: 1rem;
  border-radius: 5px;
  background-repeat: no-repeat;
  background-position: 1rem center;
  text-align: right;
  font: var(--text-preset-3);
  color: var(--green-900);
  transition: 0.2s ease-in-out;
}

input#bill {
  background-image: url("images/icon-dollar.svg");
}

input#num-people {
  background-image: url("images/icon-person.svg");
}

input#bill:hover,
input#num-people:hover {
  outline: 0.125rem solid var(--green-400);
}

input::placeholder {
  font: var(--text-preset-3);
  font-size: 1.25rem;

  color: var(--grey-500);
  text-align: right;
}
.input-error {
  outline: 0.125rem solid var(--orange-400);
}

.section-bill,
.section-tips,
.people-number {
  margin-block-end: 2rem;
}

.section-heading {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

.tip-calc {
  background-color: var(--green-900);
  border-radius: 15px;
  padding: 1.5rem;
}

.label-light {
  font: var(--text-preset-5);
  color: var(--white);
}

.hidden {
  display: none;
}

.label-dark,
.error {
  display: block;
  font: var(--text-preset-5);
  color: var(--grey-500);
  margin-block-end: 0.5rem;
}

.error {
  color: var(--orange-400);
}

p {
  font: var(--text-preset-6);
  color: var(--grey-400);
}

.tip-upper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

#tip-person,
#tip-total {
  font: var(--text-preset-1);
  font-size: clamp(2rem, 4vw, 3rem);
}

.tip-amount {
  font: var(--text-preset-2);
  color: var(--green-400);
}

.tip-combined {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.tips {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.btn {
  padding: 0.5rem;
  transition: 0.3s ease-in-out;
  cursor: pointer;
  border: 0;
  border-radius: 5px;
  font: var(--text-preset-4);
  width: 100%;
}

.tips .btn {
  color: var(--white);
  background-color: var(--green-900);
}

.tips .btn:hover,
.btn#reset:hover {
  color: var(--green-900);
  background-color: var(--green-200);
}

.btn.selected {
  color: var(--green-900);
  background-color: var(--green-200);
}

.btn#reset {
  margin-block-start: 2rem;
  color: var(--green-900);
  background-color: var(--green-400);
}

legend {
  display: table;
}

fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

@media (min-width: 47.8125rem) {
  body {
    padding: 5rem;
  }
  main {
    padding-block-end: 3.125rem;
    padding-block-start: 3.125rem;
    padding-inline-start: 5rem;
    padding-inline-end: 5rem;
    border-radius: 25px;
  }

  .tips {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
  }

  .tip-calc {
    padding: 2.5rem;
  }
}

@media (min-width: 90rem) {
  main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 57.5rem;
    padding: 2rem;
  }
  .top-left {
    margin: 1rem 0 1rem 0;
  }
  .tip-calc {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    padding: 2rem;
  }
  .people-number {
    margin: 0;
  }
}