@import url("https://fonts.googleapis.com/css2?family=Spartan:wght@200;300;600&display=swap");
.theme-1 {
  --body-bg: #3a4663;
  --del-btn: #647198;
  --del-btn-hover: #a2b2e1;
  --del-and-reset-btn-fz: 20px;
  --num-btn: #eae3dc;
  --num-btn-text: #434a59;
  --num-btn-fz: 32px;
  --num-btn-hover: #fff;
  --equl-btn: #d03f2f;
  --equal-btn-hover: #f96b5b;
  --reset-btn: #647198;
  --reset-btn-hover: #a2b2e1;
  --ball-color: #d03f2f;
  --ball-hover: #f96b5b;
  --input-bg: #181f33;
  --input-br: 10px;
  --input-text-fz: 48px;
  --calc-btn-container: #242d44;
  --calc-btn-container-br: 10px;
  --calc-head-color: #ffffff;
  --calc-head-fz: 32px;
  --theme-text-fz: 12px;
  --theme-text-color: #ffffff;
  --theme-switcher-bg: #242d44;
}
.theme-2 {
  --body-bg: #e6e6e6;
  --del-btn: #378187;
  --del-btn-hover: #62b5bc;
  --del-and-reset-btn-fz: 20px;
  --num-btn: #e5e4e1;
  --num-btn-text: #36362c;
  --num-btn-fz: 32px;
  --num-btn-hover: #fff;
  --equl-btn: #c85402;
  --equal-btn-hover: #ff8a38;
  --reset-btn: #378187;
  --reset-btn-hover: #62b5bc;
  --ball-color: #c85402;
  --ball-hover: #ff8a38;
  --input-bg: #eeeeee;
  --input-br: 10px;
  --input-text-fz: 48px;
  --calc-btn-container: #d2cdcd;
  --calc-btn-container-br: 10px;
  --calc-head-color: #36362c;
  --calc-head-fz: 32px;
  --theme-text-color: #36362c;
  --theme-text-fz: 12px;
  --theme-switcher-bg: #d2cdcd;
}
.theme-3 {
  --body-bg: #17062a;
  --del-btn: #56077c;
  --del-btn-hover: #8631af;
  --del-and-reset-btn-fz: 20px;
  --num-btn: #331c4d;
  --num-btn-text: #ffe53d;
  --num-btn-fz: 32px;
  --num-btn-hover: #6c34ac;
  --equl-btn: #00ded0;
  --equal-btn-hover: #93fff8;
  --reset-btn: #56077c;
  --reset-btn-hover: #8631af;
  --ball-color: #00ded0;
  --ball-hover: #93fff8;
  --input-bg: #1e0936;
  --input-br: 10px;
  --input-text-fz: 48px;
  --calc-btn-container: #1e0936;
  --calc-btn-container-br: 10px;
  --calc-head-color: #ffe53d;
  --calc-head-fz: 32px;
  --theme-text-color: #ffe53d;
  --theme-text-fz: 12px;
  --theme-switcher-bg: #1e0936;
}
* {
  box-sizing: border-box;
  margin: 0px;
  padding: 0px;
}
html {
  height: 100%;
}
body {
  line-height: 1.6;
  font-weight: normal;
  font-size: 16px;
  font-family: Spartan, sans-serif;
  background-color: var(--body-bg);
  color: rgb(255, 255, 255);
  overflow-x: hidden;
  height: 100%;
  -webkit-font-smoothing: antialiased;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}
.container {
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
}
.head {
  display: flex;
  justify-content: space-between;
  margin-bottom: 32px;
}
.text {
  display: flex;
  align-items: center;
  font-size: var(--calc-head-fz);
  color: var(--calc-head-color);
  font-weight: bold;
}
.switch {
  background: var(--theme-switcher-bg);
  display: flex;
  justify-content: flex-start;
  align-items: center;
  border-radius: 50px;
  position: relative;
  padding: 5px;
  height: 26px;
  width: 64px;
}
.ball {
  background: var(--ball-color);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  cursor: pointer;
}
.ball:hover {
  background: var(--ball-hover);
}
.theme-switcher {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: var(--theme-text-fz);
  color: var(--theme-text-color);
  font-weight: bold;
}
.theme-num {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 5px 0px 5px 5px;
}
.theme-num > div {
  padding-right: 16px;
}
.output {
  font-family: Spartan, sans-serif;
  width: 100%;
  height: 128px;
  background-color: var(--input-bg);
  outline: none;
  border: 0px;
  border-radius: var(--input-br);
  color: rgb(255, 255, 255);
  font-size: var(--input-text-fz);
  text-align: right;
  font-weight: bold;
  letter-spacing: -0.8px;
  padding: 38px 32px 36px 0px;
}
.wrapper {
  background: var(--calc-btn-container);
  border-radius: var(--calc-btn-container-br);
  padding: 32px;
  margin-top: 12px;
}
.calc-buttons {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(4, 100px);
  grid-template-rows: repeat(4, 64px);
  justify-content: space-around;
  gap: 16px;
  align-items: baseline;
  height: auto;
  max-width: 100%;
}
.calc-buttons > div {
  cursor: pointer;
}
.calc-buttons .num {
  background: var(--num-btn);
  font-size: var(--num-btn-fz);
  color: var(--num-btn-text);
  border-radius: 10px;
  box-shadow: rgb(179, 164, 151) 0px -4px 0px inset;
  text-align: center;
  font-weight: bold;
  font-family: Spartan, sans-serif;
  width: 101px;
  height: 64px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.calc-buttons .num:hover {
  background-color: var(--num-btn-hover);
}
.del {
  font-size: var(--del-and-reset-btn-fz);
  background: var(--del-btn);
  box-shadow: rgb(65, 78, 115) 0px -4px 0px inset;
  color: rgb(255, 255, 255);
  border-radius: 10px;
  text-align: center;
  font-weight: bold;
  font-family: Spartan, sans-serif;
  width: 101px;
  height: 64px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.del:hover {
  background: var(--del-btn-hover);
}
.buttons {
  display: flex;
  width: 100%;
  margin-top: 24px;
  justify-content: space-around;
}
.reset,
.equal {
  width: 227px;
  height: 64px;
  text-transform: uppercase;
  font-weight: bold;
  color: rgb(255, 255, 255);
  border-radius: 10px;
  font-size: var(--del-and-reset-btn-fz);
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
}
.reset {
  background: var(--reset-btn);
  box-shadow: rgb(65, 78, 115) 0px -4px 0px inset;
}
.reset:hover {
  background-color: var(--reset-btn-hover);
}
.equal {
  background-color: var(--equl-btn);
  box-shadow: rgb(147, 38, 26) 0px -4px 0px inset;
  margin-left: 24px;
}
.equal:hover {
  background: var(--equal-btn-hover);
}
.previous-operand,
.current-operand {
  display: inline;
  margin: 0px;
  padding: 0px;
}
.justify-center {
  justify-content: center;
}
.justify-end {
  justify-content: flex-end;
}
.theme-text {
  padding-top: 34px;
  padding-right: 21px;
}
@media (max-height: 768px) {
  .container {
    margin-top: 0px;
  }
}
@media (max-width: 768px) {
  .output {
    height: 74px;
  }
  .calc-buttons .num,
  .del {
    width: 60px;
    height: 64px;
  }
  .calc-buttons .num {
    font-size: 28px;
  }
  .del {
    font-size: 16px;
  }
  .calc-buttons {
    grid-template-columns: repeat(4, 66px);
    grid-template-rows: repeat(4, 63px);
    height: 100%;
    gap: 12px;
  }
  .reset,
  .equal {
    width: 133px;
    height: 64px;
    font-size: 16px;
  }
  main {
    align-items: flex-start;
  }
  .buttons {
    padding-bottom: 0px;
    margin-top: 20px;
  }
}
@media (min-width: 768px) {
  .container {
    width: 540px;
  }
  .calc-buttons {
    gap: 24px;
    justify-content: center;
  }
  .buttons {
    justify-content: center;
  }
}
@media (max-width: 390px) {
  .container {
    width: 440px;
  }
  .wrapper {
    padding: 10px;
  }
  .calc-buttons {
    gap: 8px;
  }
  .calc-buttons .num,
  .del {
    width: 60px;
    height: 60px;
  }
}
@media (max-width: 340px) {
  .calc-buttons .num {
    width: 50px;
    height: 50px;
  }
  .calc-buttons {
    grid-template-columns: repeat(4, 50px);
    grid-template-rows: repeat(4, 60px);
  }
  .reset,
  .equal {
    width: 100px;
    height: 50px;
  }
  .calc-buttons .num,
  .del {
    width: 50px;
    height: 50px;
  }
}