:root {
    --background: #ffffff;
    --foreground: #0f172a;
    --card: #ffffff;
    --card-foreground: #0f172a;
    --primary: #6366f1;
    --primary-foreground: #ffffff;
    --secondary: #f1f5f9;
    --secondary-foreground: #0f172a;
    --muted: #f1f5f9;
    --muted-foreground: #64748b;
    --accent: #f1f5f9;
    --accent-foreground: #0f172a;
    --destructive: #ef4444;
    --destructive-foreground: #ffffff;
    --border: #e2e8f0;
    --input: #e2e8f0;
    --ring: #6366f1;
    --radius: 0.5rem;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  }
  
  .dark {
    --background: #0f172a;
    --foreground: #f8fafc;
    --card: #1e293b;
    --card-foreground: #f8fafc;
    --primary: #818cf8;
    --primary-foreground: #ffffff;
    --secondary: #334155;
    --secondary-foreground: #f8fafc;
    --muted: #1e293b;
    --muted-foreground: #94a3b8;
    --accent: #334155;
    --accent-foreground: #f8fafc;
    --destructive: #ef4444;
    --destructive-foreground: #ffffff;
    --border: #334155;
    --input: #334155;
    --ring: #818cf8;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: var(--font-sans);
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
  }
  
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
  }
  
  h1 {
    font-size: 2rem;
    font-weight: 700;
  }
  
  h2 {
    font-size: 1.5rem;
    font-weight: 600;
  }
  
  h3 {
    font-size: 1.1rem;
    font-weight: 600;
  }
  
  .theme-toggle {
    background: none;
    border: none;
    color: var(--foreground);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .theme-toggle:hover {
    background-color: var(--secondary);
  }
  
  .icon {
    display: inline-block;
    vertical-align: middle;
  }
  
  .hidden {
    display: none !important;
  }
  
  .tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }
  
  .tab-btn {
    background-color: var(--secondary);
    color: var(--secondary-foreground);
    border: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
  }
  
  .tab-btn:hover {
    background-color: var(--accent);
  }
  
  .tab-btn.active {
    background-color: var(--primary);
    color: var(--primary-foreground);
  }
  
  .card {
    background-color: var(--card);
    color: var(--card-foreground);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
    overflow: hidden;
  }
  
  .card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
  }
  
  .card-header p {
    color: var(--muted-foreground);
    margin-top: 0.25rem;
  }
  
  .card-content {
    padding: 1.5rem;
  }
  
  .table-container {
    overflow-x: auto;
    margin-bottom: 1.5rem;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
  }
  
  th,
  td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
  }
  
  th {
    font-weight: 600;
    color: var(--muted-foreground);
  }
  
  .controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
  }
  
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    font-weight: 500;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  }
  
  .btn-icon {
    padding: 0.5rem;
  }
  
  .btn .icon {
    margin-right: 0.5rem;
  }
  
  .btn-icon .icon {
    margin-right: 0;
  }
  
  .btn-primary {
    background-color: var(--primary);
    color: var(--primary-foreground);
    border: 1px solid var(--primary);
  }
  
  .btn-primary:hover {
    background-color: var(--primary);
    opacity: 0.9;
  }
  
  .btn-outline {
    background-color: transparent;
    color: var(--foreground);
    border: 1px solid var(--border);
  }
  
  .btn-outline:hover {
    background-color: var(--secondary);
  }
  
  input[type="number"],
  input[type="text"] {
    padding: 0.5rem;
    border: 1px solid var(--input);
    border-radius: var(--radius);
    background-color: transparent;
    color: var(--foreground);
    width: 100%;
  }
  
  .input-small {
    width: 5rem;
  }
  
  .time-quantum {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .slider {
    -webkit-appearance: none;
    width: 100px;
    height: 6px;
    border-radius: 3px;
    background: var(--secondary);
    outline: none;
  }
  
  .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
  }
  
  .slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
  }
  
  .gantt-chart {
    position: relative;
    height: 120px;
    margin-bottom: 1.5rem;
    overflow-x: auto;
  }
  
  .gantt-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
  }
  
  .legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
  }
  
  .metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .metric-card {
    background-color: var(--muted);
    padding: 1rem;
    border-radius: var(--radius);
  }
  
  .metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 0.5rem;
  }
  
  .explanation-card {
    background-color: var(--muted);
    padding: 1rem;
    border-radius: var(--radius);
  }
  
  .explanation-content {
    margin-top: 0.5rem;
    font-size: 0.9rem;
  }
  
  .process-bar {
    position: absolute;
    height: 40px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
    font-size: 0.9rem;
    transition: opacity 0.3s;
    opacity: 0;
  }
  
  .time-marker {
    position: absolute;
    font-size: 0.8rem;
    color: var(--muted-foreground);
  }
  
  .time-line {
    position: absolute;
    width: 1px;
    background-color: var(--border);
  }
  
  .delete-btn {
    background: none;
    border: none;
    color: var(--destructive);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius);
  }
  
  .delete-btn:hover {
    background-color: var(--destructive);
    color: var(--destructive-foreground);
  }
  
  @media (max-width: 768px) {
    .tabs {
      flex-direction: column;
    }
  
    .card-header {
      flex-direction: column;
      align-items: flex-start;
    }
  
    .controls {
      flex-direction: column;
      align-items: flex-start;
    }
  
    .time-quantum {
      margin-top: 1rem;
    }
  }