/* 
 * Steam Games Library - Main Stylesheet
 * A modern, accessible, and responsive design
 */

/* ===== CSS VARIABLES & THEME COLORS ===== */
:root {
    /* Color Scheme - Light Mode */
    --primary-color: #1a6aff;
    --primary-hover: #0052e0;
    --secondary-color: #6c5ce7;
    --accent-color: #00b894;
    
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    
    /* Typography */
    --heading-font: 'Poppins', sans-serif;
    --body-font: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
  }
  
  /* Dark Mode Theme */
  body.dark-mode {
    --primary-color: #4d8cff;
    --primary-hover: #6ca0ff;
    --secondary-color: #9f94ff;
    --accent-color: #00d1a7;
    
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #333333;
    --input-bg: #2a2a2a;
    --input-border: #444444;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
  }
  
  /* ===== BASE STYLES ===== */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    font-size: 16px;
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--body-font);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
  }
  
  h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
  }
  
  a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  a:hover {
    color: var(--primary-hover);
  }
  
  button {
    cursor: pointer;
    font-family: var(--body-font);
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  /* ===== LAYOUT ===== */
  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
  }
  
  header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-normal);
  }
  
  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  .logo svg {
    color: var(--primary-color);
  }
  
  .logo h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
  }
  
  main {
    flex: 1;
    padding: var(--spacing-xl) 0;
  }
  
  footer {
    background-color: var(--card-bg);
    padding: var(--spacing-lg) 0;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: auto;
    transition: background-color var(--transition-normal);
  }
  
  /* ===== THEME TOGGLE ===== */
  .theme-toggle button {
    background: none;
    border: none;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: background-color var(--transition-fast);
  }
  
  .theme-toggle button:hover {
    background-color: rgba(0, 0, 0, 0.05);
  }
  
  body.dark-mode .theme-toggle button:hover {
    background-color: rgba(255, 255, 255, 0.1);
  }
  
  .theme-toggle .sun {
    display: none;
  }
  
  .theme-toggle .moon {
    display: block;
  }
  
  body.dark-mode .theme-toggle .sun {
    display: block;
  }
  
  body.dark-mode .theme-toggle .moon {
    display: none;
  }
  
  /* ===== SEARCH CONTAINER ===== */
  .search-container {
    margin-bottom: var(--spacing-xl);
  }
  
  .search-box {
    display: flex;
    position: relative;
    max-width: 600px;
    margin: 0 auto;
  }
  
  .search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
  }
  
  #searchInput {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) calc(var(--spacing-md) * 3);
    border: 2px solid var(--input-border);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  }
  
  #searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 106, 255, 0.2);
  }
  
  body.dark-mode #searchInput:focus {
    box-shadow: 0 0 0 3px rgba(77, 140, 255, 0.3);
  }
  
  #searchButton {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 var(--spacing-lg);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-weight: 500;
    transition: background-color var(--transition-fast);
  }
  
  #searchButton:hover {
    background-color: var(--primary-hover);
  }
  
  #searchButton:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(26, 106, 255, 0.2);
  }
  
  body.dark-mode #searchButton:focus {
    box-shadow: 0 0 0 3px rgba(77, 140, 255, 0.3);
  }
  
  /* ===== LOADING INDICATOR ===== */
  .loading {
    display: none;
    text-align: center;
    padding: var(--spacing-xl);
  }
  
  .spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: var(--spacing-md);
  }
  
  @keyframes spin {
    to { transform: rotate(360deg); }
  }
  
  body.dark-mode .spinner {
    border-color: rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
  }
  
  /* ===== GAMES CONTAINER ===== */
  .games-container {
    margin-bottom: var(--spacing-xl);
  }
  
  .results-summary {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  .games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
  }
  
  .game-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
  }
  
  .game-card:hover, .game-card:focus {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
  }
  
  .game-card:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
  }
  
  .game-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    background-color: #000;
  }
  
  .game-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
  }
  
  .game-card:hover .game-image img {
    transform: scale(1.05);
  }
  
  .game-info {
    padding: var(--spacing-md);
  }
  
  .game-info h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .app-id {
    font-size: 0.8rem;
    color: var(--text-secondary);
  }
  
  /* ===== PAGINATION ===== */
  .pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
  }
  
  .pagination button {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-sm);
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-color);
    font-weight: 500;
    transition: all var(--transition-fast);
  }
  
  .pagination button:hover:not([disabled]) {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
  }
  
  .pagination button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
  }
  
  .pagination button:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-color);
  }
  
  .pagination button[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
  }
  
  .pagination .prev, .pagination .next {
    padding: 0 var(--spacing-md);
  }
  
  .pagination .ellipsis {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    color: var(--text-secondary);
  }
  
  /* ===== ERROR & NO RESULTS ===== */
  .error-message, .no-results {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
  }
  
  .error-message p, .no-results p {
    margin-bottom: var(--spacing-md);
  }
  
  .error-message button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: background-color var(--transition-fast);
  }
  
  .error-message button:hover {
    background-color: var(--primary-hover);
  }
  
  /* ===== ACCESSIBILITY ===== */
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
  
  /* Focus styles for keyboard navigation */
  :focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
  }
  
  /* ===== RESPONSIVE DESIGN ===== */
  @media (max-width: 768px) {
    html {
      font-size: 14px;
    }
    
    .games-grid {
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: var(--spacing-md);
    }
    
    .search-box {
      flex-direction: column;
    }
    
    #searchInput {
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    
    #searchButton {
      border-radius: 0 0 var(--radius-md) var(--radius-md);
      padding: var(--spacing-sm) var(--spacing-md);
    }
  }
  
  @media (max-width: 480px) {
    .logo h1 {
      font-size: 1.2rem;
    }
    
    .games-grid {
      grid-template-columns: 1fr;
    }
    
    .pagination {
      gap: var(--spacing-xs);
    }
    
    .pagination button {
      min-width: 36px;
      height: 36px;
      font-size: 0.9rem;
    }
  }
  
  /* ===== ANIMATIONS ===== */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  .games-container {
    animation: fadeIn 0.3s ease-in-out;
  }
  
  /* Card hover effect */
  .game-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0) 70%, rgba(0,0,0,0.7) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
  }
  
  .game-card:hover::after {
    opacity: 1;
  }
  
  /* Button press effect */
  button:active:not([disabled]) {
    transform: translateY(1px);
  }