/* Base styles and variables */
:root {
  /* Theme 1 variables */
  --main-bg-1: hsl(222, 26%, 31%);
  --keypad-bg-1: hsl(223, 31%, 20%);
  --screen-bg-1: hsl(224, 36%, 15%);
  --key-func-bg-1: hsl(225, 21%, 49%);
  --key-func-shadow-1: hsl(224, 28%, 35%);
  --key-equal-bg-1: hsl(6, 63%, 50%);
  --key-equal-shadow-1: hsl(6, 70%, 34%);
  --key-bg-1: hsl(30, 25%, 89%);
  --key-shadow-1: hsl(28, 16%, 65%);
  --text-dark-1: hsl(221, 14%, 31%);
  --text-light-1: hsl(0, 0%, 100%);
  
  /* Theme 2 variables */
  --main-bg-2: hsl(0, 0%, 90%);
  --keypad-bg-2: hsl(0, 5%, 81%);
  --screen-bg-2: hsl(0, 0%, 93%);
  --key-func-bg-2: hsl(185, 42%, 37%);
  --key-func-shadow-2: hsl(185, 58%, 25%);
  --key-equal-bg-2: hsl(25, 98%, 40%);
  --key-equal-shadow-2: hsl(25, 99%, 27%);
  --key-bg-2: hsl(45, 7%, 89%);
  --key-shadow-2: hsl(35, 11%, 61%);
  --text-dark-2: hsl(60, 10%, 19%);
  --text-light-2: hsl(0, 0%, 100%);
  
  /* Theme 3 variables */
  --main-bg-3: hsl(268, 75%, 9%);
  --keypad-bg-3: hsl(268, 71%, 12%);
  --screen-bg-3: hsl(268, 71%, 12%);
  --key-func-bg-3: hsl(281, 89%, 26%);
  --key-func-shadow-3: hsl(285, 91%, 52%);
  --key-equal-bg-3: hsl(176, 100%, 44%);
  --key-equal-shadow-3: hsl(177, 92%, 70%);
  --key-bg-3: hsl(268, 47%, 21%);
  --key-shadow-3: hsl(290, 70%, 36%);
  --text-dark-3: hsl(198, 20%, 13%);
  --text-light-3: hsl(52, 100%, 62%);
  --text-white: hsl(0, 0%, 100%);
}

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

body {
  font-family: 'League Spartan', sans-serif;
  font-weight: 700;
  font-size: 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  transition: background-color 0.3s ease;
}

/* Theme specific styles */
.theme-1 {
  background-color: var(--main-bg-1);
  color: var(--text-light-1);
}

.theme-2 {
  background-color: var(--main-bg-2);
  color: var(--text-dark-2);
}

.theme-3 {
  background-color: var(--main-bg-3);
  color: var(--text-light-3);
}

/* Calculator container */
.calculator-container {
  width: 100%;
  max-width: 540px;
  margin-bottom: 2rem;
}

/* Header styles */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.header h1 {
  font-size: 2rem;
}

.theme-switcher {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
}

.theme-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.theme-numbers {
  display: flex;
  justify-content: space-around;
  width: 100%;
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}

.toggle {
  width: 70px;
  height: 26px;
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  padding: 5px;
}

.theme-1 .toggle {
  background-color: var(--keypad-bg-1);
}

.theme-2 .toggle {
  background-color: var(--keypad-bg-2);
}

.theme-3 .toggle {
  background-color: var(--keypad-bg-3);
}

.toggle-btn {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  position: absolute;
  transition: transform 0.3s ease;
}

.theme-1 .toggle-btn {
  background-color: var(--key-equal-bg-1);
  transform: translateX(0);
}

.theme-2 .toggle-btn {
  background-color: var(--key-equal-bg-2);
  transform: translateX(22px);
}

.theme-3 .toggle-btn {
  background-color: var(--key-equal-bg-3);
  transform: translateX(44px);
}

/* Display styles */
.display {
  width: 100%;
  padding: 1.5rem;
  border-radius: 10px;
  margin-bottom: 1.5rem;
  text-align: right;
  overflow: hidden;
}

.theme-1 .display {
  background-color: var(--screen-bg-1);
}

.theme-2 .display {
  background-color: var(--screen-bg-2);
}

.theme-3 .display {
  background-color: var(--screen-bg-3);
}

#result {
  font-size: 2.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Keypad styles */
.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 1.5rem;
  border-radius: 10px;
}

.theme-1 .keypad {
  background-color: var(--keypad-bg-1);
}

.theme-2 .keypad {
  background-color: var(--keypad-bg-2);
}

.theme-3 .keypad {
  background-color: var(--keypad-bg-3);
}

.key {
  font-family: inherit;
  font-weight: 700;
  font-size: 1.5rem;
  padding: 0.75rem 0;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: transform 0.1s;
}

.key:active {
  transform: translateY(2px);
}

.theme-1 .key {
  background-color: var(--key-bg-1);
  box-shadow: 0 4px 0 var(--key-shadow-1);
  color: var(--text-dark-1);
}

.theme-2 .key {
  background-color: var(--key-bg-2);
  box-shadow: 0 4px 0 var(--key-shadow-2);
  color: var(--text-dark-2);
}

.theme-3 .key {
  background-color: var(--key-bg-3);
  box-shadow: 0 4px 0 var(--key-shadow-3);
  color: var(--text-light-3);
}

.key-function {
  font-size: 1rem;
}

.theme-1 .key-function {
  background-color: var(--key-func-bg-1);
  box-shadow: 0 4px 0 var(--key-func-shadow-1);
  color: var(--text-light-1);
}

.theme-2 .key-function {
  background-color: var(--key-func-bg-2);
  box-shadow: 0 4px 0 var(--key-func-shadow-2);
  color: var(--text-light-2);
}

.theme-3 .key-function {
  background-color: var(--key-func-bg-3);
  box-shadow: 0 4px 0 var(--key-func-shadow-3);
  color: var(--text-light-2);
}

.key-equals {
  font-size: 1rem;
}

.theme-1 .key-equals {
  background-color: var(--key-equal-bg-1);
  box-shadow: 0 4px 0 var(--key-equal-shadow-1);
  color: var(--text-light-1);
}

.theme-2 .key-equals {
  background-color: var(--key-equal-bg-2);
  box-shadow: 0 4px 0 var(--key-equal-shadow-2);
  color: var(--text-light-2);
}

.theme-3 .key-equals {
  background-color: var(--key-equal-bg-3);
  box-shadow: 0 4px 0 var(--key-equal-shadow-3);
  color: var(--text-dark-3);
}

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

/* Attribution styles */
.attribution {
  font-size: 11px;
  text-align: center;
  margin-top: auto;
}

.theme-1 .attribution a {
  color: var(--key-equal-bg-1);
}

.theme-2 .attribution a {
  color: var(--key-equal-bg-2);
}

.theme-3 .attribution a {
  color: var(--key-equal-bg-3);
}

/* Media queries */
@media (max-width: 375px) {
  .calculator-container {
    max-width: 100%;
  }
  
  .keypad {
    gap: 0.75rem;
    padding: 1rem;
  }
  
  .key {
    font-size: 1.25rem;
    padding: 0.5rem 0;
  }
}