:root {
  --bg-primary: #1c1c1c;
  --bg-calculator: #2c2c2c;
  --bg-display: #3c3c3c;
  --text-primary: #ffffff;
  --text-secondary: #000000;
  --accent-orange: #ff9500;
  --btn-number: #505050;
  --btn-function: #404040;
  --btn-clear: #a5a5a5;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

.calculator-container {
  background: var(--bg-calculator);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 320px;
  animation: slideIn 0.5s ease-out;
}
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.simple-mode .scientific-functions {
  display: none;
}
.simple-mode .calculator-container {
  max-width: 280px;
}
.simple-mode #display {
  font-size: 3.5rem;
}

.calculator-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.calculator-header h1 {
  color: var(--text-primary);
  font-size: 1.3rem;
  font-weight: 400;
}
.calculator-header .header-controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

.mode-toggle-container {
  display: flex;
  align-items: center;
  gap: 8px;
}
.mode-toggle-container .mode-label {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.2);
  transition: 0.4s;
}
.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.4s;
}

input:checked + .slider {
  background-color: var(--accent-orange);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--accent-orange);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 24px;
}
.slider.round:before {
  border-radius: 50%;
}

.history-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.history-btn img {
  width: 18px;
  height: 18px;
  filter: brightness(0) invert(1);
}
.history-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.display {
  background: var(--bg-display);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 20px;
  animation: fadeIn 0.6s ease-out 0.2s both;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#display {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 2.8rem;
  font-weight: 300;
  text-align: right;
  outline: none;
}

.buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scientific-functions {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.scientific-functions .btn {
  animation: buttonSlideIn 0.4s ease-out both;
}
.scientific-functions .btn:nth-child(1) {
  animation-delay: 0.43s;
}
.scientific-functions .btn:nth-child(2) {
  animation-delay: 0.46s;
}
.scientific-functions .btn:nth-child(3) {
  animation-delay: 0.49s;
}
.scientific-functions .btn:nth-child(4) {
  animation-delay: 0.52s;
}
.scientific-functions .btn:nth-child(5) {
  animation-delay: 0.55s;
}
.scientific-functions .btn:nth-child(6) {
  animation-delay: 0.58s;
}
.scientific-functions .btn:nth-child(7) {
  animation-delay: 0.61s;
}
.scientific-functions .btn:nth-child(8) {
  animation-delay: 0.64s;
}
.scientific-functions .btn:nth-child(9) {
  animation-delay: 0.67s;
}
.scientific-functions .btn:nth-child(10) {
  animation-delay: 0.7s;
}
.scientific-functions .btn:nth-child(11) {
  animation-delay: 0.73s;
}
.scientific-functions .btn:nth-child(12) {
  animation-delay: 0.76s;
}
.scientific-functions .btn:nth-child(13) {
  animation-delay: 0.79s;
}
.scientific-functions .btn:nth-child(14) {
  animation-delay: 0.82s;
}
.scientific-functions .btn:nth-child(15) {
  animation-delay: 0.85s;
}
@keyframes buttonSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.standard-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.standard-actions .btn-delete {
  grid-column: span 2;
}
.standard-actions .btn {
  animation: buttonSlideIn 0.4s ease-out both;
}

.main-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  grid-template-areas: "sign percent dot divide" "seven eight nine multiply" "four five six subtract" "one two three add" "zero zero equals equals";
}
.main-keypad .btn {
  animation: buttonSlideIn 0.4s ease-out both;
}
.main-keypad .btn:nth-child(1) {
  animation-delay: 0.84s;
}
.main-keypad .btn:nth-child(2) {
  animation-delay: 0.88s;
}
.main-keypad .btn:nth-child(3) {
  animation-delay: 0.92s;
}
.main-keypad .btn:nth-child(4) {
  animation-delay: 0.96s;
}
.main-keypad .btn:nth-child(5) {
  animation-delay: 1s;
}
.main-keypad .btn:nth-child(6) {
  animation-delay: 1.04s;
}
.main-keypad .btn:nth-child(7) {
  animation-delay: 1.08s;
}
.main-keypad .btn:nth-child(8) {
  animation-delay: 1.12s;
}
.main-keypad .btn:nth-child(9) {
  animation-delay: 1.16s;
}
.main-keypad .btn:nth-child(10) {
  animation-delay: 1.2s;
}
.main-keypad .btn:nth-child(11) {
  animation-delay: 1.24s;
}
.main-keypad .btn:nth-child(12) {
  animation-delay: 1.28s;
}
.main-keypad .btn:nth-child(13) {
  animation-delay: 1.32s;
}
.main-keypad .btn:nth-child(14) {
  animation-delay: 1.36s;
}
.main-keypad .btn:nth-child(15) {
  animation-delay: 1.4s;
}
.main-keypad .btn:nth-child(16) {
  animation-delay: 1.44s;
}
.main-keypad .btn:nth-child(17) {
  animation-delay: 1.48s;
}
.main-keypad .btn:nth-child(18) {
  animation-delay: 1.52s;
}

.btn {
  border: none;
  border-radius: 16px;
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  height: 56px;
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.3s ease, height 0.3s ease;
}
.btn:active {
  transform: scale(0.95);
}
.btn:active::before {
  width: 100px;
  height: 100px;
}
.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-number {
  background: var(--btn-number);
  color: var(--text-primary);
}

.btn-operator {
  background: var(--accent-orange);
  color: var(--text-primary);
  font-size: 1.2rem;
}
.btn-operator:hover {
  background: linear-gradient(135deg, #ff9500, #ffb84d);
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 20px rgba(255, 149, 0, 0.4);
}

.btn-function {
  background: var(--btn-function);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.btn-clear,
.btn-delete {
  background: var(--btn-clear);
  color: var(--text-secondary);
  font-weight: 500;
}

.btn-delete img {
  width: 18px;
  height: 18px;
  filter: brightness(0);
}

.btn-equals {
  background: var(--accent-orange);
  color: var(--text-primary);
  font-size: 1.2rem;
  grid-area: equals;
}
.btn-equals:hover {
  background: linear-gradient(135deg, #ff9500, #ffb84d);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(255, 149, 0, 0.5);
}
.btn-equals:active {
  animation: pulse 0.3s ease;
}
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

.zero {
  grid-area: zero;
}

/* Grid positioning */
.main-keypad .btn:nth-child(1) {
  grid-area: sign;
}

.main-keypad .btn:nth-child(2) {
  grid-area: percent;
}

.main-keypad .btn:nth-child(3) {
  grid-area: dot;
}

.main-keypad .btn:nth-child(4) {
  grid-area: divide;
}

.main-keypad .btn:nth-child(5) {
  grid-area: seven;
}

.main-keypad .btn:nth-child(6) {
  grid-area: eight;
}

.main-keypad .btn:nth-child(7) {
  grid-area: nine;
}

.main-keypad .btn:nth-child(8) {
  grid-area: multiply;
}

.main-keypad .btn:nth-child(9) {
  grid-area: four;
}

.main-keypad .btn:nth-child(10) {
  grid-area: five;
}

.main-keypad .btn:nth-child(11) {
  grid-area: six;
}

.main-keypad .btn:nth-child(12) {
  grid-area: subtract;
}

.main-keypad .btn:nth-child(13) {
  grid-area: one;
}

.main-keypad .btn:nth-child(14) {
  grid-area: two;
}

.main-keypad .btn:nth-child(15) {
  grid-area: three;
}

.main-keypad .btn:nth-child(16) {
  grid-area: add;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  animation: modalFadeIn 0.3s ease-out;
}
@keyframes modalFadeIn {
  from {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    backdrop-filter: blur(5px);
  }
}

.modal-content {
  background: var(--bg-calculator);
  margin: 10% auto;
  border-radius: 20px;
  width: 90%;
  max-width: 400px;
  max-height: 70vh;
  overflow: hidden;
  box-shadow: var(--shadow);
  animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.modal-header h2 {
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 400;
}

.close {
  color: var(--text-primary);
  font-size: 1.8rem;
  cursor: pointer;
  padding: 4px;
}
.close:hover {
  color: var(--accent-orange);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  max-height: 50vh;
}

#history-list {
  list-style: none;
  margin-bottom: 20px;
}
#history-list li {
  background: rgba(60, 60, 60, 0.5);
  margin-bottom: 8px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--text-primary);
  font-family: monospace;
  border-left: 3px solid var(--accent-orange);
  font-size: 0.9rem;
}

.clear-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, #ff4757, #ff3742);
  color: var(--text-primary);
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}
.clear-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.1);
}

/* Responsive */
@media (max-width: 480px) {
  .calculator-container {
    max-width: 100%;
    padding: 16px;
  }
  .calculator-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
  }
  .calculator-header h1 {
    font-size: 1.5rem;
  }
  .calculator-header .header-controls {
    width: 100%;
    justify-content: space-between;
  }
  .btn {
    height: 52px;
    font-size: 0.95rem;
  }
  .btn-function {
    font-size: 0.8rem;
  }
  .btn-operator,
  .btn-equals {
    font-size: 1.1rem;
  }
  #display {
    font-size: 2.4rem;
  }
  .scientific-functions,
  .main-keypad {
    gap: 6px;
  }
}
@media (max-width: 360px) {
  .btn {
    height: 48px;
    font-size: 0.9rem;
  }
  .btn-function {
    font-size: 0.75rem;
  }
  #display {
    font-size: 2rem;
  }
  .scientific-functions,
  .main-keypad {
    gap: 5px;
  }
}
@media (min-width: 481px) {
  .calculator-container {
    max-width: 340px;
    padding: 24px;
  }
  .btn {
    height: 60px;
    font-size: 1.1rem;
  }
  .btn-function {
    font-size: 1rem;
  }
  #display {
    font-size: 3.2rem;
  }
}

/*# sourceMappingURL=index.css.map */