/* Responsive Design - Mobile First */

/* Mobile First - Base styles for mobile (320px and up) */
.calculator-container {
  padding: var(--space-md);
  margin: var(--space-sm);
}

.calculator-header h1 {
  font-size: 2rem;
  line-height: 1.2;
}

.calculator-header p {
  font-size: 1rem;
}

.slider-container {
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.slider-container label {
  font-size: 1rem;
}

.slider-value {
  font-size: 1rem;
  min-width: 70px;
  padding: var(--space-xs) var(--space-sm);
}

.results-panel {
  padding: var(--space-lg);
}

.results-header h2 {
  font-size: 1.5rem;
}

.results-subtitle {
  font-size: 1rem;
}

.result-card {
  padding: var(--space-md);
}

.result-value {
  font-size: 1.8rem;
}

.result-card.primary .result-value {
  font-size: 2.2rem;
}

.achievement-panel {
  padding: var(--space-lg);
}

.achievement-header {
  flex-direction: column;
  gap: var(--space-sm);
  text-align: center;
}

.achievement-header h3 {
  font-size: 1.3rem;
}

.achievement-progress {
  font-size: 0.8rem;
}

.achievement-grid {
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}

.achievement-item {
  padding: var(--space-md);
}

.achievement-icon {
  font-size: 1.5rem;
}

.achievement-title {
  font-size: 1rem;
}

.achievement-description {
  font-size: 0.8rem;
}

.educational-panel {
  padding: var(--space-lg);
}

.educational-content h3 {
  font-size: 1.3rem;
}

.educational-content p {
  font-size: 0.9rem;
}

.formula-explanation h4 {
  font-size: 1.1rem;
}

.formula-explanation li {
  font-size: 0.9rem;
  padding-left: var(--space-sm);
}

.achievement-notification {
  top: var(--space-md);
  right: var(--space-md);
  left: var(--space-md);
  max-width: none;
  padding: var(--space-md);
}

.achievement-notification .achievement-icon {
  font-size: 2rem;
}

.achievement-notification .achievement-title {
  font-size: 1rem;
}

.achievement-notification .achievement-description {
  font-size: 0.8rem;
}

/* Small Mobile - 480px and up */
@media (min-width: 480px) {
  .calculator-container {
    padding: var(--space-lg);
    margin: var(--space-md);
  }
  
  .calculator-header h1 {
    font-size: 2.2rem;
  }
  
  .slider-container {
    padding: var(--space-lg);
  }
  
  .result-value {
    font-size: 2rem;
  }
  
  .result-card.primary .result-value {
    font-size: 2.5rem;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .achievement-notification {
    right: var(--space-md);
    left: auto;
    max-width: 320px;
  }
}

/* Tablet - 768px and up */
@media (min-width: 768px) {
  .calculator-container {
    padding: var(--space-xl);
    margin: var(--space-lg) auto;
    max-width: 700px;
  }
  
  .calculator-header h1 {
    font-size: 2.3rem;
  }
  
  .calculator-header p {
    font-size: 1.1rem;
  }
  
  .slider-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
  
  .slider-container {
    margin-bottom: 0;
  }
  
  .results-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
  
  .result-card.primary {
    grid-column: 1 / -1;
  }
  
  .achievement-header {
    flex-direction: row;
    text-align: left;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
  }
  
  .educational-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
  }
  
  .achievement-notification {
    top: var(--space-lg);
    right: var(--space-lg);
    max-width: 350px;
  }
}

/* Desktop - 1024px and up */
@media (min-width: 1024px) {
  .calculator-container {
    padding: var(--space-2xl);
    max-width: 800px;
  }
  
  .calculator-header h1 {
    font-size: 2.5rem;
  }
  
  .calculator-header p {
    font-size: 1.2rem;
  }
  
  .slider-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
  
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .result-card.primary {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-lg);
    text-align: left;
  }
  
  .result-card.primary .result-label,
  .result-card.primary .result-value,
  .result-card.primary .result-description {
    grid-column: 2;
    text-align: center;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
  
  .results-comparison {
    display: flex;
    justify-content: space-between;
    gap: var(--space-lg);
  }
  
  .educational-content {
    grid-template-columns: 2fr 1fr;
  }
}

/* Large Desktop - 1200px and up */
@media (min-width: 1200px) {
  .calculator-container {
    max-width: 900px;
  }
  
  .slider-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .results-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .result-card.primary {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, 1fr);
  }
  
  .result-card.primary .result-label,
  .result-card.primary .result-value,
  .result-card.primary .result-description {
    grid-column: 2 / 4;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  }
}

/* Extra Large Desktop - 1440px and up */
@media (min-width: 1440px) {
  .calculator-container {
    max-width: 1000px;
  }
  
  .achievement-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* Landscape Mobile Orientation */
@media (max-height: 500px) and (orientation: landscape) {
  .calculator-container {
    margin: var(--space-sm) auto;
    padding: var(--space-md);
  }
  
  .calculator-header {
    margin-bottom: var(--space-lg);
  }
  
  .calculator-header h1 {
    font-size: 1.8rem;
  }
  
  .results-panel {
    padding: var(--space-md);
  }
  
  .achievement-panel {
    padding: var(--space-md);
  }
  
  .educational-panel {
    padding: var(--space-md);
  }
}

/* Print Styles */
@media print {
  body {
    background: white;
  }
  
  .calculator-container {
    box-shadow: none;
    border: 1px solid #ccc;
    margin: 0;
    max-width: none;
  }
  
  .achievement-notification {
    display: none;
  }
  
  .slider {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  
  .results-panel {
    background: white;
    color: black;
    border: 2px solid var(--blue-primary);
  }
  
  .result-card {
    border: 1px solid #ccc;
    background: white;
  }
  
  .achievement-panel {
    border: 1px solid #ccc;
  }
  
  .educational-panel {
    border: 1px solid #ccc;
  }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .slider::-webkit-slider-thumb {
    border-width: 2px;
  }
  
  .achievement-icon {
    image-rendering: -webkit-optimize-contrast;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .slider::-webkit-slider-thumb {
    transition: none;
  }
  
  .result-card,
  .achievement-item,
  .slider-container {
    transition: none;
  }
}

/* Dark Mode (System Preference) */
@media (prefers-color-scheme: dark) {
  :root {
    --background: #1a1a1a;
    --surface: #2a2a2a;
    --text: #e0e0e0;
    --text-secondary: #b0b0b0;
  }
  
  /* Only apply if user hasn't explicitly chosen light mode */
  .calculator-container {
    background: var(--surface);
    color: var(--text);
  }
  
  .slider-container {
    background: var(--surface);
    border-color: #444;
  }
  
  .achievement-panel {
    background: var(--surface);
    border-color: #444;
  }
  
  .educational-panel {
    background: var(--surface);
    border-color: #444;
  }
}

/* Focus Management for Keyboard Navigation */
@media (any-hover: none) {
  .slider:focus {
    outline: 2px solid var(--blue-primary);
    outline-offset: 2px;
  }
  
  .result-card:focus {
    outline: 2px solid var(--blue-primary);
    outline-offset: 2px;
  }
}

/* Touch Device Optimizations */
@media (any-pointer: coarse) {
  .slider::-webkit-slider-thumb {
    width: 32px;
    height: 32px;
  }
  
  .slider::-moz-range-thumb {
    width: 32px;
    height: 32px;
  }
  
  .tooltip:hover .tooltiptext {
    visibility: hidden;
    opacity: 0;
  }
  
  .tooltip:focus .tooltiptext,
  .tooltip:active .tooltiptext {
    visibility: visible;
    opacity: 1;
  }
}