:root {
  --strong-cyan: hsl(172, 67%, 45%);
  --very-dark-cyan: hsl(183, 100%, 15%);
  --dark-grayish-cyan: hsl(186, 14%, 43%);
  --grayish-cyan: hsl(184, 14%, 56%);
  --light-grayish-cyan: hsl(185, 41%, 84%);
  --very-light-grayish-cyan: hsl(189, 41%, 97%);
  --white: hsl(0, 0%, 100%);
}

/* Global */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Base Styles */

body {
  font-family: "Space Mono", serif;
  font-size: 24px;
  background-color: var(--light-grayish-cyan);
  width: 100%;
}

.calculator-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 100px auto;
}

form {
  background-color: var(--white);
  border-radius: 1rem 1rem 0 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  gap: 1.5rem;
  padding: 2rem;
}

.form-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
}

.form-group {
  width: 311px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-evenly;
}

.image-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 50px 0 50px 0;
}

label {
  font-size: 16px;
  font-weight: bold;
  color: var(--dark-grayish-cyan);
}

.billAmount,
.numPeople {
  width: 311px;
  height: 48px;
  border-radius: 10px;
  border: none;
}

input {
  text-align: end;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--very-dark-cyan);
  background-color: var(--very-light-grayish-cyan);
  cursor: pointer;
}

input:focus {
  border: 3px solid var(--strong-cyan);
}

input:hover {
  border: 2px solid var(--strong-cyan);
}

form input {
  padding-right: 10px;
}

.tip-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.tip-buttons button {
  width: 113px;
  height: 48px;
  border: none;
  background-color: var(--very-dark-cyan);
  border-radius: 10px;
  font-size: 24px;
  font-weight: bold;
  color: white;
}

button:hover {
  cursor: pointer;
  background-color: hsl(173, 61%, 77%);
  color: var(--very-dark-cyan);
}

.tip-buttons button:focus,
.tip-btn.active {
  background-color: hsl(173, 61%, 77%);
  color: var(--very-dark-cyan);
}

.billAmount {
  background-image: url(/assets/images/icon-dollar.svg);
  background-repeat: no-repeat;
  background-position: 1rem center;
}

.numPeople {
  background-image: url(/assets/images/icon-person.svg);
  background-repeat: no-repeat;
  background-position: 1rem center;
}

.custom-tip {
  width: 113px;
  height: 48px;
  border: none;
  border-radius: 10px;
}

.results {
  width: 311px;
  background-color: var(--very-dark-cyan);
  border-radius: 10px;
  padding: 30px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-top {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 30px;
}

.result-info,
.result-info-amt {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.result-info p,
.result-info-amt p {
  color: white;
  font-size: 16px;
  font-weight: bold;
  display: flex;
  flex-direction: column;
}

.result-info span,
.result-info-amt span {
  font-size: 13px;
  font-weight: bold;
  color: var(--grayish-cyan);
}

#resetBtn {
  width: 281px;
  height: 48px;
  border-radius: 10px;
  background-color: var(--strong-cyan);
  border: none;
  cursor: pointer;
  color: var(--very-dark-cyan);
  font-weight: bold;
  font-size: 20px;
  text-transform: uppercase;
}

#resetBtn:hover {
  background-color: hsl(173, 61%, 77%);
}

#tipAmount,
#totalAmount {
  font-size: 32px;
  font-weight: bold;
  color: var(--strong-cyan);
}

.shake {
  animation: error-shake 0.5s ease-in-out;
}

input:user-invalid,
.user-invalid {
  border: 3px solid red;
}

.error-message {
  color: red;
  font-size: 0.8rem;
}

/* Animations */

@keyframes error-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25%,
  75% {
    transform: translateX(-5px);
  }
  50% {
    transform: translateX(5px);
  }
}

@media screen and (min-width: 700px) {
  main {
    margin: 50px auto;
  }

  form {
    display: flex;
    flex-direction: row;
    align-items: center;
    border-radius: 1rem;
    align-items: center;
    justify-content: space-around;
    gap: 2rem;
    padding: 3rem;
    height: 481px;
    width: 900px;
    margin: 50px auto;
  }

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

  .tip-btn {
    width: 113px;
  }

  .billAmount,
  .numPeople {
    width: 379px;
  }

  .results {
    width: 413px;
    height: 417px;
    justify-content: center;
    gap: 100px;
  }

  .reset-form-group {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  #resetBtn {
    width: 333px;
  }

  .form-section {
    width: 379px;
    height: 388px;
    gap: 2.5rem;
  }
}