:root {
  --Green-400: hsl(172, 67%, 45%);

  --Green-900: hsl(183, 100%, 15%);
  --Grey-500: hsl(186, 14%, 43%);
  --Grey-400: hsl(184, 14%, 56%);
  --Grey-200: hsl(185, 41%, 84%);
  --Grey-50: hsl(189, 47%, 97%);
  --White: hsl(0, 100%, 100%);

  --spacing-l: 2.25rem;
  --spacing-m: 1.5rem;
  --spacing-s: 0.75rem;
  --spacing-xs: 0.5rem;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Space Mono", monospace;
  font-weight: 700;
}

body {
  font-style: normal;
  background-color: var(--Grey-200);
}

main {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-l) 0;
}

header {
  width: fit-content;
  padding-bottom: var(--spacing-m);
}

article {
  width: 100%;
  background-color: var(--White);
  padding: var(--spacing-m);
}

form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-m);
  padding-bottom: var(--spacing-m);
}

.tip-section > label {
  padding-bottom: var(--spacing-xs);
}

.label {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-xs);
}

.tip-section > label {
  display: block;
  color: var(--Grey-400);
}

label[for="bill-input"],
label[for="tip-selection"],
label[for="people"] {
  display: block;
  color: var(--Grey-400);
}

input[name="bill-input"],
input[name="people"] {
  width: 100%;
  padding: var(--spacing-xs);
  border: 1px solid transparent;
  color: var(--Green-900);
  font-size: 1.5rem;
  text-align: right;
  background: no-repeat;
  background-position: 16px 16px;
  border-radius: 0.5rem;
  cursor: pointer;
}

input[name="bill-input"]::-webkit-inner-spin-button,
input[name="bill-input"]::-webkit-outer-spin-button,
input[name="people"]::-webkit-inner-spin-button,
input[name="people"]::-webkit-outer-spin-button,
input.custom-input::-webkit-inner-spin-button,
input.custom-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

input[name="bill-input"] {
  background-image: url(./images/icon-dollar.svg);
  background-color: var(--Grey-50);
}

input[name="people"] {
  background-image: url(./images/icon-person.svg);
  background-color: var(--Grey-50);
}

input[name="bill-input"]:focus,
input[name="people"]:focus {
  outline: 2px solid var(--Green-400);
}

input[name="bill-input"].error,
input[name="people"].error {
  outline: 2px solid salmon;
}

.error-message {
  color: salmon;
  font-size: 0.75rem;
  text-align: right;
}

.tip-selection {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-s);

  input[type="number"] {
    width: 100%;
    font-size: 1.25rem;
    text-align: end;
    padding: var(--spacing-xs) var(--spacing-s) var(--spacing-xs);
    border-radius: 0.5rem;
    border: 1px solid transparent;
    background-color: var(--Grey-50);
    color: var(--Green-900);
    cursor: pointer;
  }
  input[type="number"]:focus {
    outline: 2px solid var(--Green-400);
  }
}

.tip {
  height: fit-content;
}

.tip label {
  font-size: 1.25rem;
  display: block;
  background-color: var(--Green-900);
  color: var(--White);
  padding: var(--spacing-xs) 0;
  text-align: center;
  border-radius: 0.5rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

.radio-input:checked + label {
  background-color: var(--Green-400);
  color: var(--Green-900);
}

input[type="radio"] {
  appearance: none;
  display: none;
}

.result {
  background-color: var(--Green-900);
  padding: var(--spacing-m);
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-m);
}

.result-text p:first-child {
  font-size: 1rem;
  color: var(--White);
}

.result-text p:last-child {
  font-size: 0.75rem;
  color: var(--Grey-50);
}

.tip-result {
  display: flex;
  justify-content: space-between;
}

.amount {
  color: var(--Green-400);
  font-size: 1.5rem;
}

.reset {
  font-size: 1.25rem;
  border-radius: 0.5rem;
  outline: 1px solid transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-s) 0;
  width: 100%;
  background-color: var(--Green-400);
  color: var(--Green-900);
}

.reset:hover,
.tip label:hover {
  background-color: var(--Grey-200);
  color: var(--Green-900);
}

@media (min-width: 64rem) {
  body {
    display: grid;
    place-items: center;
    height: 100vh;
  }
  .calculator-wrapper {
    max-width: 50rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-l);
    border-radius: 1rem;
  }

  .tip-selection {
    grid-template-columns: repeat(3, 1fr);
  }

  .result {
    padding: var(--spacing-l) var(--spacing-m);
    gap: var(--spacing-l);
  }

  .reset {
    margin-top: auto;
    font-size: 1.5rem;
  }
}

.attribution {
  font-size: 11px;
  text-align: center;
}
.attribution a {
  color: hsl(228, 45%, 44%);
}