style.css

:root {
  --primary-color: #ff014f;
  --secondary-color: #ecf0f3;
  --secondary-color-b: #e4e4e4;
  --primary-gradient: linear-gradient(145deg, #ff014f, #d11414);
  --button-gradient: linear-gradient(145deg, #e2e8ec, #ffffff);

  --text-c-link: #646c77;
  --text-c-hover: #f8f9fa;
  --light-text-c: #3c3e41;
  --shadow: 5px 5px 15px #d1d9e6, -5px -5px 15px #ffffff;

  --border-c: rgba(128, 128, 128, 0.5);

  --ff: "Poppins", sans-serif;
  --ff: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --transition: 0.2s;
}
:root {
  --primary-color: #ff014f;
  --secondary-color: #212428;
  --secondary-color-b: #2e2e2e;
  --primary-gradient: linear-gradient(145deg, #ff014f, #d11414);
  --button-gradient: linear-gradient(145deg, #1e2024, #23272b);

  --text-c-link: #96a3b6;
  --text-c-hover: #f8f9fa;
  --light-text-c: #e1e6ee;
  --shadow: 10px 10px 19px #1c1e22, -10px -10px 19px #262a2e;

  --border-c: rgba(128, 128, 128, 0.5);

  --ff: "Poppins", sans-serif;
  --ff: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --transition: 0.2s;
}
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.flex {
  display: flex;
  align-items: center;
}
::-webkit-scrollbar {
  width: 7px;
  background-color: var(--secondary-color);
}
::-webkit-scrollbar-thumb {
  background-image: var(--primary-gradient);
  border-radius: 100vw;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield;
}
::selection {
  background-color: var(--primary-color);
  color: var(--light-text-c);
}
body {
  flex-direction: column;
  padding: 1rem 0;
  justify-content: center;
  align-items: flex-start;
  background: repeating-linear-gradient(
      45deg,
      var(--secondary-color-b) 0,
      var(--secondary-color-b) 5%,
      var(--secondary-color) 0,
      var(--secondary-color) 50%
    )
    0 / 10px 10px;
  scroll-behavior: smooth;
}
.main-title {
  color: var(--light-text-c);
  font-family: var(--ff);
  font-size: 3rem;
  position: relative;
  margin-bottom: 2rem;
  font-weight: 700;
}
.heading {
  width: calc(50vw + 10rem);
  letter-spacing: 2px;
  font-family: var(--ff);
  color: var(--primary-color);
}
.nopage {
  display: none;
}
.disable {
  color: rgb(59, 59, 59) !important;
  background-color: gray;
  pointer-events: none;
}
.disable:focus {
  outline: none;
}
.form .page {
  flex-direction: column;
}
.form .page .field {
  margin: 1rem;
  align-items: flex-start;
  flex-direction: column;
  gap: 0.5rem;
}
select,
input {
  color: var(--light-text-c);
  z-index: 1;
  width: calc(50vw + 10rem);
  padding: 1rem 2rem;
  margin: 0.4rem 0;
  box-shadow: var(--shadow);
  border: none;
  background-image: var(--button-gradient);
  border-radius: 5px;
  font-family: var(--ff);
  transition: var(--transition);
}
option {
  background-color: var(--secondary-color);
}
button:focus,
input:focus,
select:focus,
button:hover,
select:hover,
input:hover {
  outline: 2px solid var(--primary-color);
  border-radius: 5px;
}
.button {
  margin: 1rem;
  padding: 1rem 2rem;
  font-family: var(--ff);
  border-radius: 6px;
  transition: var(--transition);
  position: relative;
  color: var(--primary-color);
  cursor: pointer;
  font-weight: 500;
  font-size: 1.1rem;
  border: none;
}
.button::after {
  box-shadow: var(--shadow);
  border-radius: 6px;
  content: "";
  position: absolute;
  height: 100%;
  background-image: var(--button-gradient);
  width: 100%;
  top: 0;
  z-index: -2;
  left: 0;
}
.button::before {
  box-shadow: var(--shadow);
  border-radius: 6px;
  content: "";
  position: absolute;
  height: 100%;
  width: 100%;
  background-image: var(--primary-gradient);
  top: 0;
  opacity: 0;
  left: 0;
  transition: var(--transition);
  z-index: -1;
}
.button:hover {
  transform: translateY(-4px);
  color: var(--text-c-hover);
}
.button:hover::before {
  opacity: 1;
}
.all-buttons {
  justify-content: space-between;
}
.subButton {
  width: fit-content !important;
}

.result {
  color: var(--light-text-c);
  text-shadow: 0 0 10px var(--primary-color);
  font-family: var(--ff);
  font-size: 3rem;
  position: relative;
  margin: 2rem;
  font-weight: 700;
}