@import url("https://fonts.googleapis.com/css2?family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap");

:root {
  --white: #ffffff;
  --black: #000000;
  --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-100: 8px;
  --spacing-200: 16px;
  --spacing-300: 24px;
  --spacing-400: 32px;
  --spacing-500: 40px;
  --spacing-600: 48px;
  --spacing-1000: 80px;
  --spacing-1200: 96px;
  --spacing-1500: 120px;
  --spacing-1600: 128px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-family: "Space Mono", monospace;
  font-size: 16px;
  font-weight: 400;
}

h1,
h2,
h3,
p {
  margin: 0;
}
body {
  background-color: var(--grey-200);
  margin: 0;
}
.container {
  width: 100%;

  display: flex;
  flex-direction: column;
  align-items: center;
}
.logo {
  margin: 50px 0;
}
.content-container {
  width: 100%;
  background-color: var(--white);
  border-radius: 15px 15px 0 0;
  padding: var(--spacing-400);
}
.bill {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-400);
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-100);
}
label,
.text-tip {
  font-weight: 700;
  color: var(--grey-500);
  margin-bottom: var(--spacing-100);
}
input {
  width: 100%;
  padding: var(--spacing-200);
  border: none;
  border-radius: 5px;
  background-color: var(--grey-50);
  color: var(--green-900);
  font-weight: 700;
  font-size: 1.2rem;
  text-align: end;
}
input::placeholder {
  color: var(--grey-300);
}

.input-group {
  position: relative;
}
.input-group > .input-icon {
  position: absolute;
  top: 50%;
  left: 16px;
  transform: translateY(-50%);
}

.tip-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-200);
}
.btn-tip {
  background-color: var(--green-800);
  border: none;
  color: var(--white);
  padding: var(--spacing-200);
  font-weight: 700;
  font-size: 1.5rem;
  border-radius: 5px;
  cursor: pointer;
}
.btn-tip:nth-child(6) {
  background-color: var(--grey-50);
  color: var(--grey-550);
}
.results {
  background-color: var(--green-900);
  color: var(--white);
  padding: var(--spacing-300);
  border-radius: 15px;
  margin-top: 32px;
}
.amount {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-200);
}
.amount > .text-tip > .tip-amount {
  color: var(--white);
}
.amount > .text-tip > .tip-person {
  color: var(--grey-400);
  font-size: 0.8rem;
}
.amount > .total-amount,
.total-tip-amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-400);
}
.btn-reset {
  margin-top: var(--spacing-200);
  background-color: var(--green-400);
  color: var(--green-900);
  border-radius: 5px;
  width: 100%;
  padding: var(--spacing-200);
  border: none;
  font-weight: 700;
  font-size: 1.2rem;
  cursor: pointer;
}
.btn-reset:disabled {
  background-color: var(--green-750);
  color: var(--green-800);
  cursor: not-allowed;
}

.btn-tip:active,
.btn-reset:active {
  background-color: var(--green-200);
  color: var(--green-900);
}
.label-group {
  display: flex;
  justify-content: space-between;
}
.error-message {
  color: var(--orange-400);
  font-size: 0.8rem;
  font-weight: 700;
  display: none;
}
.error-input{
  border: 2px solid var(--orange-400);
  background-color: var(--white);
}
input:focus {
  border: 2px solid var(--green-400);
  outline: none;
}

@media screen and (min-width: 768px) {
  .logo {
    margin-bottom: var(--spacing-600);
  }
  .container {
    height: 100vh;
    justify-content: center;
  }
  .content-container {
    width: 608px;
    border-radius: 15px;
    padding: var(--spacing-600) var(--spacing-1000);
  }
  .amount > .total-amount,
  .total-tip-amount {
    font-size: 3rem;
  }
}
@media screen and (min-width: 1440px) {
  .content-container {
    width: 920px;
    padding: var(--spacing-400);
    display: flex;
    gap: var(--spacing-600);
  }
  .content-container > .bill,
  .results {
    width: 50%;
  }
  .results {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
}