/* CSS Variables for Theming - Improved with softer colors */
:root {
    /* Updated color scheme with softer contrasts */
    --bg-color: #f5f7fa;
    --card-bg-color: #fcfcfd;
    --text-color: #4b5563;
    --heading-color: #1f2937;
    --secondary-text-color: #64748b;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.03);
    --accent-color: #3b82f6;
    --hover-bg-color: rgba(191, 219, 254, 0.15);
    --hover-underline-color: #93c5fd;
    --control-bg: #ffffff;
    --control-icon: #64748b;
    --control-border: #e2e8f0;
    
    /* Typography adjustments */
    --font-size-base: 1.05rem;
    --line-height-base: 1.8;
    
    /* Spacing improvements */
    --content-padding-x: 4rem;
    --content-padding-y: 3.5rem;
    --paragraph-spacing: 1.8rem;
  }
  
  .dark-mode {
    --bg-color: #0f172a;
    --card-bg-color: #1e293b;
    --text-color: #cbd5e1;
    --heading-color: #f1f5f9;
    --secondary-text-color: #94a3b8;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --accent-color: #60a5fa;
    --hover-bg-color: rgba(59, 130, 246, 0.15);
    --hover-underline-color: #3b82f6;
    --control-bg: #334155;
    --control-icon: #cbd5e1;
    --control-border: #475569;
  }
  
  /* Text Size Scaling - Improved for better readability */
  .text-size-sm { --font-size-base: 1rem; --line-height-base: 1.75; }
  .text-size-md { --font-size-base: 1.05rem; --line-height-base: 1.8; } /* Default */
  .text-size-lg { --font-size-base: 1.15rem; --line-height-base: 1.85; }
  .text-size-xl { --font-size-base: 1.25rem; --line-height-base: 1.9; }
  
  /* Basic Reset */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: var(--line-height-base);
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 1.5rem;
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
  }
  
  /* Controls Container - Made more subtle */
  .controls {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    gap: 0.75rem;
    z-index: 1000;
  }
  
  .controls button {
    background-color: var(--control-bg);
    color: var(--control-icon);
    border: 1px solid var(--control-border);
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    opacity: 0.85;
  }
  
  .controls button:hover {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
    opacity: 1;
  }
  
  .controls button:active {
    transform: scale(0.95);
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.2);
  }
  
  /* Main Content Container - Made softer with subtle background */
  main {
    max-width: 880px;
    margin: 4rem auto;
    margin-top: 6rem;
    background-color: var(--card-bg-color);
    background-image: linear-gradient(to bottom, var(--card-bg-color), var(--card-bg-color));
    padding: var(--content-padding-y) var(--content-padding-x);
    box-shadow: 0 10px 30px var(--shadow-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.4s ease;
  }
  
  /* Main Heading - Improved typography */
  h1 {
    font-size: calc(var(--font-size-base) * 2.5);
    font-weight: 800;
    text-align: center;
    color: var(--heading-color);
    margin-bottom: 3.5rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
  }
  
  /* Article Text Styling - Improved readability */
  article {
    font-weight: 400;
    color: var(--text-color);
    transition: color 0.3s ease;
    max-width: 100%;
  }
  
  article p {
    margin-bottom: var(--paragraph-spacing);
  }
  
  /* Section headings */
  article p > strong:first-child {
    font-weight: 600;
    display: block;
    margin-bottom: calc(var(--font-size-base) * 0.75);
    color: var(--secondary-text-color);
    font-size: calc(var(--font-size-base) * 1.15);
    letter-spacing: 0.01em;
    transition: color 0.3s ease;
  }
  
  /* Bolding within claims */
  .claim strong {
    font-weight: 600;
    color: var(--heading-color);
  }
  
  /* Clickable Claim Styling - More subtle hover effect */
  .claim {
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-decoration: none;
    color: inherit;
    padding: 2px 4px;
    margin: -2px -4px;
    border-radius: 4px;
    position: relative;
  }
  
  .claim:hover {
    background-color: var(--hover-bg-color);
    text-decoration: underline;
    text-decoration-color: var(--hover-underline-color);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    color: inherit;
  }
  
  .claim:hover strong {
    color: var(--heading-color);
  }
  
  /* Improved Responsive Adjustments */
  @media (max-width: 1024px) {
    :root {
      --content-padding-x: 3.5rem;
      --content-padding-y: 3rem;
    }
    
    main {
      max-width: 90%;
    }
  }
  
  @media (max-width: 900px) {
    :root {
      --content-padding-x: 3rem;
      --content-padding-y: 2.75rem;
    }
    
    main {
      max-width: 92%;
    }
  }
  
  @media (max-width: 768px) {
    :root {
      --font-size-base: 1rem;
      --content-padding-x: 2.5rem;
      --content-padding-y: 2.5rem;
      --paragraph-spacing: 1.7rem;
    }
    
    .text-size-sm { --font-size-base: 0.95rem; }
    .text-size-md { --font-size-base: 1rem; }
    .text-size-lg { --font-size-base: 1.1rem; }
    .text-size-xl { --font-size-base: 1.2rem; }
    
    main {
      padding: var(--content-padding-y) var(--content-padding-x);
      margin: 5rem auto 2.5rem auto;
      max-width: 94%;
    }
    
    h1 {
      font-size: calc(var(--font-size-base) * 2.25);
      margin-bottom: 3rem;
    }
    
    .controls {
      top: 1.25rem;
      right: 1.25rem;
    }
    
    .controls button {
      width: 2.5rem;
      height: 2.5rem;
    }
  }
  
  @media (max-width: 600px) {
    :root {
      --content-padding-x: 2rem;
      --content-padding-y: 2.25rem;
      --paragraph-spacing: 1.6rem;
    }
    
    body {
      padding: 1rem;
    }
    
    main {
      margin: 4.5rem auto 2rem auto;
      border-radius: 10px;
      max-width: 96%;
    }
    
    h1 {
      font-size: calc(var(--font-size-base) * 2);
      margin-bottom: 2.5rem;
    }
  }
  
  @media (max-width: 480px) {
    :root {
      --font-size-base: 0.95rem;
      --content-padding-x: 1.5rem;
      --content-padding-y: 2rem;
      --paragraph-spacing: 1.5rem;
    }
    
    .text-size-sm { --font-size-base: 0.9rem; }
    .text-size-md { --font-size-base: 0.95rem; }
    .text-size-lg { --font-size-base: 1.05rem; }
    .text-size-xl { --font-size-base: 1.15rem; }
    
    body {
      padding: 0.75rem;
    }
    
    .controls {
      top: 0.75rem;
      right: 0.75rem;
    }
    
    .controls button {
      width: 2.4rem;
      height: 2.4rem;
      font-size: 1rem;
    }
    
    main {
      padding: var(--content-padding-y) var(--content-padding-x);
      margin: 4rem auto 1.5rem auto;
      border-radius: 8px;
      box-shadow: 0 8px 20px var(--shadow-color);
      max-width: 100%;
    }
    
    h1 {
      font-size: calc(var(--font-size-base) * 1.9);
      margin-bottom: 2rem;
    }
  }