:root {
  --bg-color: #1d1f31;
  --container-bg: #282a36;
  --text-color: #ffffff;
  --input-bg: #f5f5f5;
  --output-bg: #828282;
  --button-bg: #4a90e2;
  --button-hover: #3a7bc8;
  --chart-colors: #ffc107, #BAD617, #28A745, #188230;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 20px;
  box-sizing: border-box;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: var(--container-bg);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

h1 {
  font-size: 1.8rem;
  margin: 0;
}

.input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.input-container {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 15px;
  border-radius: 8px;
}

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

input[type="number"] {
  width: 50%;
  padding: 10px;
  border: none;
  border-radius: 4px;
  background-color: var(--input-bg);
  color: #333;
  font-size: 1rem;
}

.common-values {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.common-value {
  background-color: var(--button-bg);
  color: var(--text-color);
  border: none;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.common-value:hover,
.common-value:focus {
  background-color: var(--button-hover);
}

.help-text {
  font-size: 0.8rem;
  color: #aaa;
  margin-top: 5px;
}

.output-container {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.output-number {
  width: 20%;
  padding: 5px;
  border: none;
  border-radius: 4px;
  background-color: var(--output-bg);
  color: #ffffff;
  font-size: 1rem;
}

.chart-container {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 20px;
  padding-bottom: 100px;
  border-radius: 8px;
  height: 300px;
}

#helpButton {
  background-color: var(--button-bg);
  color: var(--text-color);
  border: none;
  padding: 5px 10px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
  background-color: var(--container-bg);
  margin: 15% auto;
  padding: 20px;
  border-radius: 8px;
  width: 80%;
  max-width: 500px;
}

#closeHelp {
  background-color: var(--button-bg);
  color: var(--text-color);
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  margin-top: 15px;
}

@media (max-width: 600px) {
  .input-group {
    grid-template-columns: 1fr;
  }
}