:root {
  --color-primary: hsl(172, 67%, 45%);

  --color-green-dark: hsl(183, 100%, 15%);
  --color-grey-dark: hsl(186, 14%, 43%);
  --color-grey-medium: hsl(184, 14%, 56%);
  --color-grey-light: hsl(185, 41%, 84%);
  --color-grey-lighter: hsl(189, 47%, 97%);
  --color-white: hsl(0, 100%, 100%);
}

/* GENERAL SETTING */
* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

html {
  font-size: 62.5%;
  box-sizing: border-box;
}

body {
  font-family: "Space Mono", sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  background-color: var(--color-grey-light);
  min-height: 100vh;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* LAYOUT */
.logo-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 4rem;
}

.container {
  max-width: 92rem;
  width: 100%;
  margin-top: auto;
  margin-bottom: auto;
  padding: 3.2rem;
  background-color: var(--color-white);
  border-radius: 20px;
  box-shadow: 2rem 2rem 4rem rgba(38, 192, 171, 0.15);

  display: flex;
  gap: 4.8rem;
  align-items: stretch;
}

/* INPUT */
.input-container {
  width: 38rem;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 4rem;
  flex-shrink: 0;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.label-text {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.label {
  color: var(--color-grey-dark);
  font-weight: 700;
}

.error-text {
  color: #e17052;
  text-align: right;
}

.input-field {
  position: relative;
}

input {
  font-family: inherit;
  font-size: 2.4rem;
  font-weight: inherit;
  color: var(--color-green-dark);
  background-color: var(--color-grey-lighter);
  text-align: right;
  border: 2px solid transparent;
  padding: 0.8rem 1.6rem;
  border-radius: 5px;
  width: 100%;
  cursor: text;
  outline: none;
}

.input-field input::placeholder {
  color: #9ebbbd;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input.input-valid {
  border: 2px solid #26c2ae;
  border-radius: 5px;
}

input.input-invalid {
  border: 2px solid #e17052;
  border-radius: 5px;
}

.input-field .input-empty {
  color: #9ebbbd;
}

.input-icon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 1.6rem;
}

.btn-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}

/* REUSABLE COMPONENTS */
.btn {
  background-color: var(--color-green-dark);
  color: var(--color-white);
  font-family: inherit;
  font-size: 2.4rem;
  font-weight: 600;
  padding: 0.8rem 1.6rem;
  border: none;
  border-radius: 5px;
  transition: all 0.3s;
}

@media (hover: hover) and (pointer: fine) {
  .btn:hover {
    cursor: pointer;
    background-color: #9fe8df;
    color: var(--color-green-dark);
  }
}

.btn.btn-selected {
  background-color: var(--color-primary);
  color: var(--color-green-dark);
}

input.input-custom {
  text-align: center;
  padding: 0.8rem 0;
}

/* OUTPUT */
.outcome-container {
  background-color: var(--color-green-dark);
  color: var(--color-white);
  border-radius: 15px;
  padding: 2.4rem 3.2rem;

  display: flex;
  flex-direction: column;
  width: 41rem;
  flex-shrink: 0;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.4rem;
}

.outcome-descrip {
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
}

.per-person {
  font-size: 1.3rem;
  color: var(--color-grey-medium);
}

.amount {
  font-size: 4.8rem;
  color: var(--color-primary);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-reset {
  margin-top: auto;
  text-transform: uppercase;
  font-size: 2rem;
  padding: 0.8rem 4rem;
}

.btn.reset-active {
  background-color: var(--color-primary);
  color: var(--color-green-dark);
}

.btn.reset-empty {
  color: #085c61;
  background-color: #0d686d;
}

/* FOOTER */
.footer {
  padding: 2rem 0;
  color: var(--color-green-dark);
}
.attribution {
  font-size: 11px;
  text-align: center;
}

.attribution a {
  color: inherit;
}

.attribution a:hover {
  text-decoration: none;
}