/**
 * Enhanced Codeword Solver Styles
 * Improved styling with better responsiveness and accessibility
 */

 :root {
    /* Core colors */
    --primary-color: #4a90e2;
    --primary-dark: #357abd;
    --primary-light: #e3f2fd;
    --secondary-color: #2c3e50;
    --secondary-dark: #1a2632;
    --secondary-light: #546e7a;
    
    /* UI colors */
    --background-color: #f7f9fa;
    --card-background: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;
    
    /* State colors */
    --success-color: #2ecc71;
    --success-light: #dcfce7;
    --error-color: #e74c3c;
    --error-light: #fee2e2;
    --warning-color: #f39c12;
    --info-color: #3498db;
    
    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    
    /* Layout */
    --container-width: 800px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
  }
  
  /* Base styles */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-family);
    margin: 0;
    padding: var(--spacing-lg) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
  }
  
  a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
  }
  
  /* Container */
  .container {
    width: 90%;
    max-width: var(--container-width);
    background: var(--card-background);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-md);
    margin: 1rem;
  }
  
  /* Typography */
  h1 {
    font-size: 1.75rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    line-height: 1.3;
  }
  
  h2 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
  }
  
  h3 {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
  }
  
  p {
    margin-bottom: var(--spacing-md);
  }
  
  /* Navigation */
  .links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }
  
  .mode-switch {
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 600;
    color: var(--secondary-color);
    position: relative;
  }
  
  .mode-switch.active {
    color: var(--primary-color);
  }
  
  .mode-switch.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: var(--border-radius-sm);
  }
  
  /* Instructions */
  .instructions {
    margin: var(--spacing-lg) 0;
    line-height: 1.6;
    font-size: 0.95rem;
    color: var(--text-light);
    background-color: var(--primary-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--primary-color);
  }
  
  .instructions code {
    background: rgba(255, 255, 255, 0.7);
    padding: 2px 4px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 0.9em;
  }
  
  .instructions b {
    color: var(--secondary-color);
  }
  
  /* Form elements */
  .solver-form {
    margin-bottom: var(--spacing-xl);
  }
  
  .pattern-group {
    margin-bottom: var(--spacing-lg);
  }
  
  .pattern-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--secondary-color);
  }
  
  /* Input controls */
  .pattern-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }
  
  .word-length {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: white;
    cursor: pointer;
    transition: border-color var(--transition-fast);
  }
  
  .word-length:focus {
    outline: none;
    border-color: var(--primary-color);
  }
  
  .clear-pattern {
    background-color: var(--secondary-light);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
  }
  
  .clear-pattern:hover {
    background-color: var(--secondary-color);
  }
  
  /* Input fields */
  .inputs-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
  }
  
  .inputs-container input {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: white;
    transition: all var(--transition-fast);
  }
  
  .inputs-container input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.3);
  }
  
  .inputs-container input:hover:not(:focus) {
    border-color: var(--primary-light);
  }
  
  /* Form controls */
  .form-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
  }
  
  .form-controls label {
    font-weight: 600;
    color: var(--secondary-color);
    white-space: nowrap;
  }
  
  select {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: white;
    cursor: pointer;
    transition: border-color var(--transition-fast);
  }
  
  select:focus {
    outline: none;
    border-color: var(--primary-color);
  }
  
  .primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    white-space: nowrap;
  }
  
  .primary-btn:hover:not(:disabled) {
    background-color: var(--primary-dark);
  }
  
  .primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
  }
  
  /* Results area */
  .results-section {
    margin-top: var(--spacing-xl);
    animation: fadeIn var(--transition-normal);
  }
  
  .results-count {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    color: var(--secondary-color);
    text-align: center;
    font-weight: 600;
  }
  
  .pattern-results {
    margin-bottom: var(--spacing-lg);
  }
  
  .matches {
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius-sm);
    line-height: 1.6;
    font-size: 0.95rem;
    color: var(--text-color);
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
  }
  
  .no-matches {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-light);
    font-style: italic;
  }
  
  /* Pagination */
  .pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
  }
  
  .page-number {
    font-size: 0.95rem;
    color: var(--text-light);
  }
  
  /* Loading state */
  .loading {
    text-align: center;
    padding: var(--spacing-xl);
  }
  
  .loading::after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    margin: var(--spacing-md) auto;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
  }
  
  .loading-subtext {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
  }
  
  /* Feedback messages */
  .error-message, 
  .success-message {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    animation: slideIn var(--transition-normal);
  }
  
  .error-message {
    background-color: var(--error-light);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
  }
  
  .success-message {
    background-color: var(--success-light);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
  }
  
  /* Animations */
  @keyframes fadeIn {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
  
  @keyframes slideIn {
    from {
      transform: translateY(-10px);
      opacity: 0;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }
  
  @keyframes spin {
    to {
      transform: rotate(360deg);
    }
  }
  
  /* Responsive adjustments */
  @media (max-width: 768px) {
    :root {
      --font-size-base: 14px;
    }
  
    .container {
      width: 95%;
      padding: var(--spacing-md);
    }
  
    h1 {
      font-size: 1.5rem;
    }
  
    .form-controls {
      flex-direction: column;
      align-items: stretch;
    }
  
    .form-controls label {
      margin-bottom: var(--spacing-xs);
    }
  
    .primary-btn {
      width: 100%;
      padding: var(--spacing-md);
      margin-top: var(--spacing-sm);
    }
  
    .inputs-container input {
      width: 32px;
      height: 32px;
      font-size: 1rem;
    }
  
    .pagination {
      flex-direction: column;
      gap: var(--spacing-md);
    }
  }
  
  /* Dark mode support */
  @media (prefers-color-scheme: dark) {
    :root {
      --background-color: #121212;
      --card-background: #1e1e1e;
      --text-color: #e0e0e0;
      --text-light: #a0a0a0;
      --border-color: #333333;
      --primary-light: rgba(74, 144, 226, 0.15);
      --success-light: rgba(46, 204, 113, 0.15);
      --error-light: rgba(231, 76, 60, 0.15);
    }
  
    .inputs-container input,
    select,
    .word-length {
      background-color: #2d2d2d;
      color: var(--text-color);
      border-color: #444444;
    }
  
    .matches {
      background-color: #2d2d2d;
    }
  
    .instructions code {
      background: rgba(0, 0, 0, 0.2);
    }
  
    .loading::after {
      border-color: #444444;
      border-top-color: var(--primary-color);
    }
  }
  
  /* Focus styles for accessibility */
  :focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
  }
  
  /* Skip to content link for keyboard users */
  .skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    z-index: 100;
    transition: top 0.2s;
  }
  
  .skip-link:focus {
    top: 0;
  }
  
  /* High contrast mode adjustments */
  @media (forced-colors: active) {
    .primary-btn,
    .clear-pattern,
    .mode-switch.active::after {
      border: 1px solid ButtonText;
    }
  }