/* Gas Laws Calculator CSS */
:root {
  --primary-color: #4a7bd1;
  --primary-light: #6a93e0;
  --primary-dark: #3a61a9;
  --secondary-color: #d14a7b;
  --secondary-light: #e06a93;
  --secondary-dark: #a93a61;
  --accent-color: #7bd14a;
  --accent-light: #93e06a;
  --accent-dark: #61a93a;
  --info-color: #4ad1c7;
  --info-light: #6ae0d5;
  --info-dark: #3aa9a1;
  --success-color: #4ac74a;
  --warning-color: #d1c74a;
  --danger-color: #d14a4a;
  --background-color: #f8f9fa;
  --text-color: #333333;
  --text-light: #666666;
  --border-color: #dddddd;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --input-bg: #ffffff;
  --hover-bg: #f0f0f0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Arial', sans-serif;
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: white;
  box-shadow: var(--card-shadow);
  border-radius: 8px;
}

/* Header Styles */
header {
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 15px;
  position: relative;
}

header h2 {
  color: var(--text-light);
  font-size: 18px;
  margin-bottom: 5px;
}

header h1 {
  font-size: 28px;
  color: var(--primary-color);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
  color: white;
  padding: 15px;
  border-radius: 8px;
  margin-top: 5px;
}

/* Tab Navigation */
.tabs {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.tab {
  padding: 12px 20px;
  cursor: pointer;
  color: var(--text-light);
  font-weight: 600;
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
  position: relative;
  z-index: 1;
}
.tabi {
  padding: 12px 20px;
  color: var(--text-light);
  font-weight: 600;
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
  position: relative;
  z-index: 1;
}

.tab:hover {
  background-color: var(--hover-bg);
  color: var(--primary-color);
}

.tab.active {
  color: var(--primary-color);
  border-color: var(--primary-color);
  background-color: var(--input-bg);
}

/* Tab Content */
.tab-content > div {
  display: none;
  animation: fadeIn 0.5s;
}

.tab-content > div.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Calculator Box Styling */
.calculator-box, .visualization-box {
  background-color: var(--input-bg);
  border-radius: 8px;
  box-shadow: var(--card-shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.info-title {
  font-size: 20px;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
  padding: 12px 20px;
  border-radius: 6px;
  margin-bottom: 20px;
  text-align: center;
}

.info-text {
  margin-bottom: 20px;
  color: var(--text-color);
  text-align: justify;
}

/* Equation Display */
.equation-display {
  background-color: rgba(74, 123, 209, 0.1);
  border-left: 4px solid var(--primary-color);
  padding: 15px;
  margin: 15px 0;
  font-size: 22px;
  text-align: center;
  font-weight: 600;
  border-radius: 4px;
}

/* Input Section Styling */
.calculation-container {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
}

.input-column {
  flex: 1;
  min-width: 300px;
}

.input-column.full-width {
  flex-basis: 100%;
}

.input-column h3 {
  font-size: 16px;
  color: var(--primary-color);
  margin-bottom: 15px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border-color);
}

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

.input-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
  color: var(--text-color);
}

.input-with-units {
  display: flex;
  align-items: center;
}

.input-with-units input {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px 0 0 4px;
  font-size: 16px;
  background-color: var(--input-bg);
  transition: border-color 0.3s;
}

.input-with-units input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(74, 123, 209, 0.2);
}

.input-with-units select,
.input-with-units .unit-label {
  padding: 10px;
  background-color: var(--primary-light);
  color: white;
  border: 1px solid var(--primary-color);
  border-left: none;
  border-radius: 0 4px 4px 0;
  font-weight: 600;
  min-width: 80px;
  text-align: center;
}

.input-with-units .unit-label {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Radio Buttons for Value Selection */
.unknown-select {
  margin-bottom: 20px;
}

.unknown-select label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--text-color);
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  background-color: var(--hover-bg);
  padding: 10px;
  border-radius: 6px;
}

.radio-option {
  display: flex;
  align-items: center;
  margin-right: 15px;
}

.radio-option input[type="radio"] {
  margin-right: 5px;
  accent-color: var(--primary-color);
}

.radio-option label {
  margin-bottom: 0;
  font-weight: normal;
}

/* Button Styling */
.button-group {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
}

.calculate-btn, .reset-btn {
  padding: 12px 24px;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.calculate-btn {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
  color: white;
  flex: 2;
}

.reset-btn {
  background-color: var(--hover-bg);
  color: var(--text-color);
  flex: 1;
}

.calculate-btn:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--info-dark) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.reset-btn:hover {
  background-color: #e0e0e0;
}

/* Result Display */
.result-box {
  background: linear-gradient(135deg, rgba(74, 123, 209, 0.1) 0%, rgba(74, 209, 199, 0.1) 100%);
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 20px;
}

.result-title {
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 10px;
  font-size: 18px;
}

.result-content {
  font-size: 18px;
  min-height: 30px;
}

/* Chart Container */
.visual-container {
  margin-top: 20px;
}

.chart-container {
  width: 100%;
  height: 300px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: white;
}

/* Visualization Tab Styles */
.visualization-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
}

.visualization-card {
  background-color: white;
  border-radius: 8px;
  box-shadow: var(--card-shadow);
  padding: 15px;
  transition: transform 0.3s;
}

.visualization-card:hover {
  transform: translateY(-5px);
}

.visualization-card h3 {
  font-size: 18px;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.visualization-card p {
  font-size: 14px;
  color: var(--text-light);
  margin-top: 10px;
}

.visualization-card.wide {
  grid-column: span 2;
}

.visualization-container {
  width: 100%;
  height: 250px;
  background-color: var(--background-color);
  border-radius: 6px;
}

/* Control Panel for Interactive Visualizations */
.control-panel {
  margin-top: 15px;
  padding: 15px;
  background-color: var(--hover-bg);
  border-radius: 6px;
}

.slider-container {
  margin-bottom: 10px;
}

.slider-container label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
  font-size: 14px;
}

.slider-container input[type="range"] {
  width: 100%;
  accent-color: var(--primary-color);
}

/* Equation Grid for Relationship Card */
.equation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-top: 15px;
}

.equation-item {
  background-color: var(--hover-bg);
  padding: 10px;
  border-radius: 4px;
  font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  .calculation-container {
    flex-direction: column;
  }
  
  .input-column {
    min-width: 100%;
  }
  
  .tab {
    padding: 8px 15px;
    font-size: 14px;
  }
  
  .visualization-card.wide {
    grid-column: span 1;
  }
  
  .visualization-grid {
    grid-template-columns: 1fr;
  }
}