body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #ff7e5f, #feb47b);
  color: #333;
  transition: background-color 0.3s, color 0.3s;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.dark-mode-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 34px;
}
.back-button {
    background-color: #ff7e5f; 
    color: white; 
    padding: 16px 70px; 
    text-align: center; 
    text-decoration: none; 
    display: inline-block; 
    border-radius: 18px;
}
.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  border-radius: 50%;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: #ff7e5f;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.container {
  width: 100%;
  max-width: 400px;
  background: #fff;
  padding: 20px;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  text-align: center;
  margin: 20px;
  transform: scale(0.95);
  transition: transform 0.3s ease-in-out;
  overflow: hidden; 
}

h1 {
  margin-bottom: 20px;
  font-size: 2em;
  color: #333;
  letter-spacing: 1px;
}

.calculator {
  margin-bottom: 20px;
}

.input-group {
  margin-bottom: 15px;
  position: relative;
}

.input-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

.input-group input[type="number"] {
  width: 100%;
  padding: 12px;
  border-radius: 30px;
  border: 1px solid #ddd;
  font-size: 1em;
  background-color: #ddd6d6;
  box-sizing: border-box;
  overflow: hidden;
}

.input-group input[type="number"]:focus {
    box-shadow: inset 0 4px 12px rgba(0, 0, 0, 0.2);
    outline: none;
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

button {
  width: 44%;
  padding: 17px;
  border-radius: 15px;
  border: none;
  background-color: #ff7e5f;
  color: #fff;
  font-size: 1.2em;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

button:hover {
  background-color: #feb47b;
  transform: translateY(-3px);
}

.results {
  margin-bottom: 20px;
}

.result-box {
  margin-bottom: 10px;
  padding: 10px;
  background-color: #f1f1f1;
  border-radius: 30px;
  font-size: 1.1em;
  color: #495057;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

#chart-container {
  width: 100%;
  height: 250px;
  animation: fadeIn 0.5s ease-in-out;
}

.dark-mode {
  background-color: #333;
  color: #f4f4f4;
}

.dark-mode .container {
  background-color: #444;
  box-shadow: none;
}

.dark-mode h1 {
  color: #f4f4f4;
}

.dark-mode input[type="number"],
.dark-mode input[type="range"],
.dark-mode button {
  background-color: #555;
  color: #f4f4f4;
  border: 1px solid #666;
}

.dark-mode button:hover {
  background-color: #feb47b;
}

/*********** Baseline, reset styles ***********/
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
  width: 24rem;
  padding-top: 20px;
}

/* Removes default focus */
input[type="range"]:focus {
  outline: none;
}

/******** Chrome, Safari, Opera and Edge Chromium styles ********/
/* slider track */
input[type="range"]::-webkit-slider-runnable-track {
  background-color: #020085;
  border-radius: 1rem;
  height: 1.5rem;
}

/* slider thumb */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; /* Override default look */
  appearance: none;
  margin-top: -8px; /* Centers thumb on the track */
  background-color: #cc6d00;
  border-radius: 0.5rem;
  height: 2.5rem;
  width: 1rem;
}

input[type="range"]:focus::-webkit-slider-thumb {
  outline: 3px solid #cc6d00;
  outline-offset: 0.125rem;
}

/*********** Firefox styles ***********/
/* slider track */
input[type="range"]::-moz-range-track {
  background-color: #020085;
  border-radius: 1rem;
  height: 1.5rem;
}

/* slider thumb */
input[type="range"]::-moz-range-thumb {
  background-color: #cc6d00;
  border: none; /*Removes extra border that FF applies*/
  border-radius: 0.5rem;
  height: 2.5rem;
  width: 1rem;
}

input[type="range"]:focus::-moz-range-thumb{
  outline: 3px solid #cc6d00;
  outline-offset: 0.125rem;
}