@font-face {
  font-family: "LeagueSpartan";
  src: url("assets/fonts/LeagueSpartan-Bold.ttf") format("truetype");
}


:root {
  --main-background: hsl(222, 26%, 31%);
  --thumb-toggle: hsl(6, 63%, 50%);
  --toggle-background: hsl(223, 31%, 20%);
  --keypad-background: hsl(223, 31%, 20%);
  --screen-background: hsl(224, 36%, 15%);
  
  --fkey-background: hsl(225, 21%, 49%);
  --fkey-shadow: hsl(224, 28%, 35%);

  --ekey-background: hsl(6, 63%, 50%);
  --ekey-shadow: hsl(6, 70%, 34%);

  --nkey-background: hsl(0, 0%, 90%);
  --nkey-shadow: hsl(28, 16%, 65%);

  --main-text: hsl(0, 100%, 100%);
  --key-text: hsl(221, 14%, 31%);
  --white-text: hsl(0, 100%, 100%);
  --equal-text: hsl(0, 100%, 100%);
}

[data-theme="theme-2"] {
  --main-background: hsl(0, 0%, 90%);
  --thumb-toggle: hsl(25, 98%, 40%);
  --toggle-background: hsl(0, 5%, 81%);
  --keypad-background: hsl(0, 5%, 81%);
  --screen-background: hsl(0, 0%, 93%);

  
  --fkey-background: hsl(185, 42%, 37%);
  --fkey-shadow: hsl(185, 58%, 25%);

  --ekey-background: hsl(25, 98%, 40%);
  --ekey-shadow: hsl(25, 99%, 27%);

  --nkey-background: hsl(0, 0%, 90%);
  --nkey-shadow: hsl(35, 11%, 61%);

  --main-text: hsl(60, 10%, 19%);
  --key-text: hsl(60, 10%, 19%);
  --white-text: hsl(0, 100%, 100%);
  --equal-text: hsl(0, 100%, 100%);
}

[data-theme="theme-3"] {
  --main-background: hsl(268, 75%, 9%);
  --thumb-toggle: hsl(176, 100%, 44%);
  --toggle-background: hsl(268, 71%, 12%);
  --keypad-background: hsl(268, 71%, 12%);
  --screen-background: hsl(268, 71%, 12%);

  
  --fkey-background: hsl(281, 89%, 26%);
  --fkey-shadow: hsl(285, 91%, 52%);

  --ekey-background: hsl(176, 100%, 44%);
  --ekey-shadow: hsl(177, 92%, 70%);

  --nkey-background: hsl(268, 47%, 21%);
  --nkey-shadow: hsl(290, 70%, 36%);

  --main-text: hsl(52, 100%, 62%);
  --key-text: hsl(52, 100%, 62%);
  --equal-text: hsl(198, 20%, 13%);
  --white-text: hsl(0, 100%, 100%);

}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--main-background);
  padding: 20px;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 15px;
  min-height: 100dvh;
}

body,
button {
  font-family: "LeagueSpartan", sans-serif;
  font-weight: 700;
}

.calc-container {
  max-width: 430px;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.calc-keyboard {
  display: grid;
  background-color: var(--keypad-background);
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 16px;
  border-radius: 8px;
}

.calc-btn-default {
  background-color: var(--nkey-background);
  padding: 20px;
  font-size: 2rem;
  border-radius: 5px;
  border: 0px;
  border-bottom: 3px var(--nkey-shadow) solid;
  color: var(--key-text);

  &.reset {
    font-size: 1.5rem;
    background-color: var(--fkey-background);
    border-bottom: 3px var(--fkey-shadow) solid;
    color: var(--white-text);
    grid-column: span 2;
  }

  &.del {
    font-size: 1.5rem;
    background-color: var(--fkey-background);
    border-bottom: 3px var(--fkey-shadow) solid;
    color: var(--white-text);
  }

  &.equal {
    font-size: 1.5rem;
    background-color: var(--ekey-background);
    border-bottom: 3px var(--ekey-shadow) solid;
    color: var(--equal-text);
    grid-column: span 2;
  }
}

.calc-display {
  display: flex;
  font-size: 2.5rem;

  color: var(--main-text);
  padding: 28px 25px 25px;
  background-color: var(--screen-background);
  border-radius: 8px;
  justify-content: flex-end;
}

.calc-input-range {
  appearance: none;
  background-color: var(--toggle-background);
  border-radius: 20px;
  padding: 4px;
  width: 70px;
}

.calc-input-range::-webkit-slider-thumb {
  appearance: none;
  background-color: var(--thumb-toggle);
  width: 18px;
  height: 18px;
  border-radius: 100%;
}

.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--main-text);
}

.calc-theme-range {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 28px;

}

.calc-theme-range label{
  margin-bottom: 8px;
}

.calc-range-span {
  font-size: 0.7rem;
  margin-bottom: 6px;
  display: flex;
  justify-content: space-evenly;
  color: var(--main-text);
}