:root {
  --color-main-background: #3a4764;
  --color-keypad-background: #232c43;
  --color-screen-background: #182034;
  --color-key-blue-background: #637097;
  --color-key-blue-shadow: #404e72;
  --color-key-blue-hover: #a2b3e1;
  --color-key-red-background: #d03f2f;
  --color-key-red-shadow: #93261a;
  --color-key-red-hover: #f86c5c;
  --color-key-gray-background: #eae3dc;
  --color-key-gray-shadow: hsl(28, 16%, 65%);
  --color-dark-blue-text: #444b5a;
  --color-white-text: #ffffff;
  --border-radius: 10px;
  --timing-animation: 0.3s;
}

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

html {
  font-size: 62.5%;
}

.container {
  font-size: 1.6rem;
  font-family: "League Spartan", sans-serif;
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  background: var(--color-main-background);
  color: var(--color-white-text);
  transition: background-color var(--timing-animation);
}

.container:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.2;
  background: url("./pattern.jpeg");
  background-size: contain;
  filter: blur(2px);
}

.container:has(.themes__toggle--isActive) {
  --color-main-background: #e6e6e6;
  --color-keypad-background: #d1cccc;
  --color-screen-background: #ededed;
  --color-key-blue-background: #377f86;
  --color-key-blue-shadow: #1b5f65;
  --color-key-blue-hover: #62b5bc;
  --color-key-red-background: #ca5502;
  --color-key-red-shadow: #893901;
  --color-key-red-hover: #ff8a38;
  --color-key-gray-background: #e5e4e1;
  --color-key-gray-shadow: #b4a597;
  --color-dark-blue-text: #35352c;
  --color-white-text: #ffffff;
  --color-top-section-text: var(--color-dark-blue-text);
}

.calc {
  width: 100%;
  max-width: 40rem;
  margin: 0 1rem;
  padding: 2rem;
  border-radius: var(--border-radius);
  z-index: 1;
  box-shadow: 0 0 0.5rem rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(5px);
}

.calc__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-top-section-text);
}

.calc__result {
  margin: 2rem 0;
  padding: 2.5rem 2rem;
  font-size: 3.2rem;
  text-align: right;
  line-height: 1;
  border-radius: calc(var(--border-radius) / 2);
  background-color: var(--color-screen-background);
  color: var(--color-top-section-text);
  transition: background-color var(--timing-animation);
}

.calc__numsContent {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 2rem;
  gap: 2rem;
  background-color: var(--color-keypad-background);
  font-size: 1.8rem;
  color: var(--color-dark-blue-text);
  border-radius: calc(var(--border-radius) / 2);
  transition: background-color var(--timing-animation);
}

.calc__key {
  position: relative;
  flex-basis: 25%;
  border-radius: calc(var(--border-radius) / 2);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 4rem;
  isolation: isolate;
  border: none;
  font-family: inherit;
  font-size: inherit;
}

.calc__key:hover:after,
.calc__key.hover:after {
  background-color: var(--color-white-text);
}

.calc__key:active {
  transform: scale(0.95);
}

.calc__key:active:before {
  bottom: -0.2rem;
}

.calc__key span {
  z-index: 1;
  user-select: none;
}

.calc__key:before {
  content: "";
  position: absolute;
  height: 100%;
  width: 100%;
  bottom: -0.3rem;
  border-radius: calc(var(--border-radius) / 2);
  background-color: var(--color-key-gray-shadow);
}

.calc__key:after {
  content: "";
  position: absolute;
  height: 100%;
  width: 100%;
  border-radius: calc(var(--border-radius) / 2);
  background-color: var(--color-key-gray-background);
  transition: all 0.3s;
}

.calc__key--wide {
  grid-column: span 2;
}

.calc[data-type="number"] {
  font-size: 2.4rem;
}

.calc [data-value="Backspace"]:hover:after,
.calc [data-value="Backspace"].hover:after,
.calc [data-value="c"]:hover:after,
.calc [data-value="c"].hover:after {
  background-color: var(--color-key-blue-hover);
}

.calc [data-value="Backspace"]:after,
.calc [data-value="c"]:after {
  background-color: var(--color-key-blue-background);
}

.calc [data-value="Backspace"]:before,
.calc [data-value="c"]:before {
  background-color: var(--color-key-blue-shadow);
}

.calc [data-value="Backspace"] span,
.calc [data-value="c"] span {
  color: var(--color-white-text);
}

.calc [data-value="Enter"]:hover:after,
.calc [data-value="Enter"].hover:after {
  background-color: var(--color-key-red-hover);
}

.calc [data-value="Enter"]:after {
  background-color: var(--color-key-red-background);
}

.calc [data-value="Enter"]:before {
  background-color: var(--color-key-red-shadow);
}

.calc [data-value="Enter"] span {
  color: var(--color-white-text);
}

.themes {
  --toggle-width: 3.5rem;
  --circle-width: 1rem;
  --toggle-padding: 0.3rem;
  display: flex;
  gap: 2rem;
  font-size: 1rem;
  align-items: flex-end;
}

.themes__label {
  line-height: 1.2;
}

.themes__toggleContent {
  display: flex;
  flex-direction: column;
  width: var(--toggle-width);
}

.themes__numbers {
  display: flex;
  justify-content: space-around;
  margin-bottom: 0.3rem;
}

.themes__number {
  cursor: pointer;
}

.themes__toggle {
  content: "";
  position: relative;
  display: flex;
  align-items: center;
  padding: 0 var(--toggle-padding);
  width: 100%;
  height: 1.5rem;
  border-radius: var(--border-radius);
  background: var(--color-keypad-background);
  cursor: pointer;
}

.themes__toggle:hover:before {
  background-color: var(--color-key-red-hover);
}

.themes__toggle:before {
  content: "";
  position: absolute;
  left: var(--toggle-padding);
  width: var(--circle-width);
  height: 1rem;
  border-radius: 50%;
  background: var(--color-key-red-background);
  transition: all var(--timing-animation);
}

.themes__toggle--isActive:before {
  left: calc(var(--toggle-width) - var(--circle-width) - var(--toggle-padding));
}