:root {
  --primary-color: #1e90ff;
  --secondary-color: #2c2c2f;
  --bg-color: #1c1c1e;
  --bg-color-brighter: #2f2f2f;
  --text-color: #ddd;
  --corner-radius: 15px;
}

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

/* Main container */
body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Oxygen, Ubuntu,
    Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  font-size: 20px; /* increase overall font size */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  z-index: -1;
}

/* Headings */
h1.app-title {
  text-align: center;
  margin-top: 2.5rem;
  background-image: linear-gradient(to right, var(--primary-color), #ff4500);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

form {
  display: grid;
  place-content: center;
}

form > * {
  padding: 15px;
  margin: 0.7rem;
}

.form-section {
  background-color: var(--bg-color-brighter);
  border-radius: var(--corner-radius);
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.14), 0 1px 5px rgba(0, 0, 0, 0.12),
    0 3px 1px -2px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-section:hover {
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
  cursor: pointer;
}

.form-section > label {
  display: block;
}

/* Form labels and inputs */
label.heading {
  font-size: 1rem;
  color: var(--text-color);
  display: block;
  margin-bottom: 0.7rem;
}

.radio-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.radio-toolbar input[type="radio"] {
  opacity: 0;
  width: 0;
  position: fixed;
}

.radio-toolbar label {
  display: inline-block;
  color: var(--text-color);
  background-color: var(--secondary-color);
  font-size: 1rem;
  font-weight: bold;
  padding: 10px;
  border: 2px solid #444;
  border-radius: var(--corner-radius);
  min-width: 9rem;
  text-align: center;
  transition: background-color 0.5s ease 0s;
}

.radio-toolbar input[type="radio"]:checked + label {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.radio-toolbar input[type="radio"]:focus + label {
  border: 2px solid var(--primary-color);
}

.radio-toolbar label:hover {
  border: 2px solid var(--primary-color);
}

.number-inputs {
  display: inline;
}

input[type="number"] {
  width: 9rem;
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 2px solid #444;
  border-radius: var(--corner-radius);
  padding: 5px;
  padding-left: 1rem;
}

input[type="number"]:focus {
  border: 2px solid var(--primary-color);
}

.number-inputs > select {
  padding: 5px;
  border-radius: 10px;
  color: var(--primary-color);
}

/* Calculate button */
button {
  border: none;
  color: var(--secondary-color);
  font-weight: bold;
  padding: 14px 28px;
  margin-top: 20px;
  cursor: pointer;
  border-radius: var(--corner-radius);
  background-image: linear-gradient(to right, var(--primary-color), #ff4500);
  font-size: 1.3rem;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* Result paragraph */
.resultCard {
  visibility: hidden;
  opacity: 0;
  --background: linear-gradient(to bottom right, var(--primary-color), #ff4500);
  padding: 0.5rem;
  margin: 1rem;
  border-radius: 1rem;
  overflow: visible;
  background: var(--bg-color-brighter);
  background: var(--background);
  position: relative;
  z-index: 1;
}

.resultCard::after {
  position: absolute;
  content: "";
  top: 30px;
  left: 0;
  right: 0;
  z-index: -1;
  height: 100%;
  width: 100%;
  transform: scale(0.8);
  filter: blur(25px);
  background: var(--bg-color-brighter);
  background: var(--background);
}

.show {
  visibility: visible;
  opacity: 1;
  transition: opacity 0.7s linear;
}

.resultParagraph {
  background: var(--bg-color-brighter);
  padding: 0.8rem;
  width: 100%;
  height: 100%;
  border-radius: 0.7rem;
}

.resultParagraph h2 {
  font-size: 1.3rem;
  font-weight: bold;
  margin: 0.4rem 0 0.4rem 0;
}

#overlay {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  visibility: hidden; /* initially hidden */
}

.emphasis {
  font-size: 1.1em;
  display: block;
  font-weight: bold;
  background-image: linear-gradient(to right, var(--primary-color), #ff4500);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

/* Slide Left */
.slide-left {
  animation: slideleft 0.5s ease forwards;
}

@keyframes slideleft {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-100%);
  }
}

.slide-back-from-left {
  animation: slidebackfromleft 0.5s ease forwards;
}

@keyframes slidebackfromleft {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

/* Slide Right */
.slide-right {
  animation: slideright 0.5s ease forwards;
}

@keyframes slideright {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(100%);
  }
}

.slide-back-from-right {
  animation: slidebackfromright 0.5s ease forwards;
}

@keyframes slidebackfromright {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}