/**
 * Base Layout Styles
 * Global styles for the default layout
 */

/* Base styles */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  width: 100%;
}

body {
  margin: 0;
  padding: 0;
  padding-top: 80px; /* Space for fixed header */
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: var(--line-height-normal);
  color: var(--color-text-primary, #333);
  background-color: var(--color-bg-primary, #fff);
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

/* Playful font for headings and titles */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Fredoka', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
}

/* Prevent images and other content from overflowing */
img,
video,
iframe,
embed,
object {
  max-width: 100%;
  height: auto;
}

/* Prevent pre and code blocks from overflowing */
pre,
code {
  max-width: 100%;
  overflow-x: auto;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: #fff;
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* Footer styles */
.site-footer {
  margin-top: var(--spacing-4xl);
  padding: var(--spacing-3xl) var(--spacing-lg);
  background: linear-gradient(
    135deg,
    var(--color-bg-gradient-start, #f8f9fa) 0%,
    var(--color-bg-secondary, #f5f5f5) 50%,
    var(--color-bg-gradient-end, #e9ecef) 100%
  );
  border-top: var(--border-width-thick) solid var(--color-border-medium, #dee2e6);
  text-align: center;
  color: var(--color-text-secondary, #666);
  width: 100%;
  overflow-x: hidden;
  position: relative;
}

/* Subtle gradient overlay for depth */
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-border-light, #e1e5e9) 50%,
    transparent 100%
  );
  opacity: 0.5;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
}

.footer-content p {
  margin: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  letter-spacing: var(--letter-spacing-wide);
}

.footer-content p:first-child {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

.footer-links a {
  color: var(--color-accent, #007bff);
  text-decoration: none;
  margin: 0 var(--spacing-10);
  transition: color var(--transition-normal, 0.2s ease);
}

.footer-links a:hover {
  color: var(--color-accent-hover, #0056b3);
  text-decoration: underline;
}

.footer-links a:focus-visible {
  outline: var(--border-width-thick) solid var(--color-border-focus, #007bff);
  outline-offset: var(--spacing-2);
  border-radius: var(--radius-sm);
}

/* Responsive typography */
@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  .site-footer {
    padding: var(--spacing-2xl) var(--spacing-md);
    margin-top: var(--spacing-3xl);
  }

  .footer-content p {
    margin: var(--spacing-sm) 0;
  }

  .footer-content p:first-child {
    margin-bottom: var(--spacing-md);
  }
}

/* Print styles */
@media print {
  .site-footer,
  .language-selector,
  .skip-link {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }
}

/* Enhanced Focus Indicators */

/* Base focus styles for all interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible,
summary:focus-visible {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  border-radius: var(--radius-sm, 3px);
  transition: outline-color var(--focus-animation-duration, 0.2s ease),
              outline-offset var(--focus-animation-duration, 0.2s ease);
}

/* Animated focus ring with pulse effect */
@keyframes focusPulse {
  0% {
    box-shadow: 0 0 0 0 var(--focus-ring-color);
  }
  50% {
    box-shadow: 0 0 0 4px rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
  }
  100% {
    box-shadow: 0 0 0 0 var(--focus-ring-color);
  }
}

/* Enhanced focus for buttons */
button:focus-visible,
.btn:focus-visible {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  animation: focusPulse 1.5s ease-in-out infinite;
}

/* Enhanced focus for links */
a:focus-visible {
  background-color: var(--focus-bg-highlight, rgba(0, 123, 255, 0.1));
  padding: var(--spacing-2) var(--spacing-xs);
  margin: calc(var(--spacing-2) * -1) calc(var(--spacing-xs) * -1);
  border-radius: var(--radius-sm, 3px);
}

/* Focus-within styles for containers */
.game-card:focus-within,
.language-selector:focus-within,
.site-header:focus-within {
  box-shadow: 0 0 0 var(--focus-ring-width, 3px) rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
  transition: box-shadow var(--focus-animation-duration, 0.2s ease);
}

/* Focus-within for form groups */
.form-group:focus-within {
  background-color: var(--focus-bg-highlight, rgba(0, 123, 255, 0.1));
  border-radius: var(--radius-md, 4px);
  padding: var(--spacing-sm, 8px);
  margin: calc(var(--spacing-sm, 8px) * -1);
  transition: background-color var(--focus-animation-duration, 0.2s ease);
}

/* Focus styles for navigation elements */
nav a:focus-visible,
.nav-link:focus-visible {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  background-color: var(--focus-bg-highlight, rgba(0, 123, 255, 0.1));
  border-radius: var(--radius-md, 4px);
}

/* Focus styles for cards and interactive containers */
.card:focus-within,
.interactive-container:focus-within {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  box-shadow: 0 0 0 var(--spacing-xs) rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
  transition: box-shadow var(--focus-animation-duration, 0.2s ease),
              outline-color var(--focus-animation-duration, 0.2s ease);
}

/* Enhanced focus for form inputs */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: 0;
  border-color: var(--focus-ring-color, #007bff);
  box-shadow: 0 0 0 var(--spacing-xs) rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
  transition: border-color var(--focus-animation-duration, 0.2s ease),
              box-shadow var(--focus-animation-duration, 0.2s ease);
}

/* Focus styles for custom controls */
.custom-checkbox:focus-visible,
.custom-radio:focus-visible {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  box-shadow: 0 0 0 var(--spacing-xs) rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
}

/* Skip link enhanced focus */
.skip-link:focus {
  outline: var(--focus-ring-width, 3px) var(--focus-ring-style, solid) var(--focus-ring-color, #007bff);
  outline-offset: var(--focus-ring-offset, 2px);
  box-shadow: 0 0 0 var(--spacing-xs) rgba(0, 123, 255, var(--focus-ring-opacity, 0.5));
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  textarea:focus-visible,
  select:focus-visible,
  [tabindex]:focus-visible {
    outline-width: var(--spacing-xs);
    outline-color: currentColor;
    outline-offset: var(--spacing-3);
  }

  .game-card:focus-within,
  .card:focus-within {
    outline: var(--spacing-xs) solid currentColor;
    outline-offset: var(--spacing-3);
  }
}

/* Reduced motion - disable animations */
@media (prefers-reduced-motion: reduce) {
  a:focus-visible,
  button:focus-visible,
  input:focus-visible,
  textarea:focus-visible,
  select:focus-visible,
  [tabindex]:focus-visible {
    transition: none;
  }

  button:focus-visible,
  .btn:focus-visible {
    animation: none;
  }

  .game-card:focus-within,
  .card:focus-within,
  .form-group:focus-within {
    transition: none;
  }
}

/* Loading States and Transitions */

/* Loading spinner with enhanced smooth rotation */
.loading-spinner {
  display: inline-block;
  width: var(--spacing-3xl);
  height: var(--spacing-3xl);
  border: var(--spacing-xs) solid var(--color-border-light, #e0e0e0);
  border-top-color: var(--color-accent, #007bff);
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.loading-spinner.small {
  width: var(--spacing-lg);
  height: var(--spacing-lg);
  border-width: var(--spacing-2);
}

.loading-spinner.large {
  width: var(--spacing-4xl);
  height: var(--spacing-4xl);
  border-width: var(--spacing-6);
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal, 0.2s ease);
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* Fade transitions */
.fade-in {
  animation: fadeIn var(--transition-normal, 0.2s ease) forwards;
}

.fade-out {
  animation: fadeOut var(--transition-normal, 0.2s ease) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* Fade in up animation */
.fade-in-up {
  animation: fadeInUp 0.4s ease forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(var(--spacing-lg));
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Content transition classes */
.content-transition {
  transition: opacity var(--transition-normal, 0.2s ease),
              transform var(--transition-normal, 0.2s ease);
}

.content-transition.hidden {
  opacity: 0;
  transform: translateY(calc(var(--spacing-sm) * -1.25));
}

.content-transition.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Image loading states */
.image-loading {
  position: relative;
  background: var(--color-bg-secondary, #f5f5f5);
  overflow: hidden;
}

.image-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  to {
    left: 100%;
  }
}

.image-loading img {
  opacity: 0;
  transition: opacity var(--transition-slow, 0.3s ease);
}

.image-loading img.loaded {
  opacity: 1;
}

/* Skeleton Screen Styles */

/* Base skeleton element */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-secondary, #f5f5f5);
  border-radius: var(--radius-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* Skeleton pulse animation */
@keyframes skeleton-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* Skeleton shimmer effect */
.skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

/* Skeleton variants for different content types */

/* Text skeleton */
.skeleton-text {
  height: 1em;
  margin-bottom: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.skeleton-text.short {
  width: 40%;
}

.skeleton-text.medium {
  width: 70%;
}

.skeleton-text.long {
  width: 100%;
}

/* Heading skeleton */
.skeleton-heading {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius-md);
}

/* Avatar/Circle skeleton */
.skeleton-circle {
  width: var(--spacing-3xl);
  height: var(--spacing-3xl);
  border-radius: 50%;
}

.skeleton-circle.small {
  width: var(--spacing-2xl);
  height: var(--spacing-2xl);
}

.skeleton-circle.large {
  width: var(--spacing-4xl);
  height: var(--spacing-4xl);
}

/* Rectangle skeleton (for images, cards, etc.) */
.skeleton-rect {
  width: 100%;
  height: 200px;
  border-radius: var(--radius-lg);
}

.skeleton-rect.small {
  height: 100px;
}

.skeleton-rect.large {
  height: 300px;
}

/* Card skeleton */
.skeleton-card {
  padding: var(--spacing-lg);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.skeleton-card .skeleton-rect {
  margin-bottom: var(--spacing-md);
}

.skeleton-card .skeleton-heading {
  margin-bottom: var(--spacing-sm);
}

.skeleton-card .skeleton-text {
  margin-bottom: var(--spacing-xs);
}

/* Button skeleton */
.skeleton-button {
  height: 40px;
  width: 120px;
  border-radius: var(--radius-lg);
}

.skeleton-button.small {
  height: 32px;
  width: 80px;
}

.skeleton-button.large {
  height: 48px;
  width: 160px;
}

/* List skeleton */
.skeleton-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.skeleton-list-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.skeleton-list-item .skeleton-circle {
  flex-shrink: 0;
}

.skeleton-list-item .skeleton-text {
  flex: 1;
  margin-bottom: 0;
}

/* Grid skeleton (for card grids) */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--min-card-width, 320px), 1fr));
  gap: var(--spacing-2xl);
}

/* Fade-in animation for content when loading completes */
.skeleton-loaded {
  animation: fadeIn var(--transition-normal, 0.2s ease) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .loading-spinner {
    animation: none;
    border-top-color: var(--color-accent, #007bff);
  }

  .image-loading::before {
    animation: none;
  }

  /* Disable skeleton animations */
  .skeleton {
    animation: none;
    opacity: 0.8;
  }

  .skeleton::after {
    animation: none;
    display: none;
  }
}

/* 404 Error Page Styles */
.error-404 {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl, 40px) var(--spacing-lg, 20px);
}

.error-container {
  max-width: 600px;
  text-align: center;
  animation: fadeInUp 0.6s ease forwards;
}

.error-icon {
  margin: 0 auto var(--spacing-2xl, 30px);
  color: var(--color-primary, #2c5aa0);
  opacity: 0.8;
}

.error-icon svg {
  width: 120px;
  height: 120px;
  display: block;
  margin: 0 auto;
}

.error-title {
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: var(--font-weight-bold, 700);
  margin: 0 0 var(--spacing-lg, 20px);
  background: var(--hero-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: var(--line-height-tight, 1.2);
}

.error-message {
  font-size: var(--font-size-2xl, 1.2em);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--color-text-primary, #333);
  margin: 0 0 var(--spacing-md, 15px);
}

.error-description {
  font-size: var(--font-size-lg, 0.95em);
  color: var(--color-text-secondary, #666);
  margin: 0 0 var(--spacing-3xl, 40px);
  line-height: var(--line-height-relaxed, 1.6);
}

.error-actions {
  margin-bottom: var(--spacing-3xl, 40px);
}

/* ============================================
   Button Component System
   ============================================ */

/* Base Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  border: var(--border-width-thick) solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  user-select: none;
  transition: transform var(--transition-normal),
              box-shadow var(--transition-normal),
              background-color var(--transition-normal),
              border-color var(--transition-normal),
              color var(--transition-normal),
              opacity var(--transition-normal);
  position: relative;
  overflow: hidden;
}

/* Remove default button styles */
.btn::-moz-focus-inner {
  border: 0;
  padding: 0;
}

/* Button Variants */

/* Primary Button - Main call-to-action */
.btn-primary {
  background: var(--hero-gradient);
  color: var(--hero-text-color);
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

.btn-primary:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-sm);
  filter: brightness(0.95);
}

.btn-primary:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  box-shadow: var(--shadow-md), 0 0 0 var(--spacing-xs) rgba(102, 126, 234, 0.4);
}

/* Secondary Button - Alternative actions */
.btn-secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border-color: var(--color-border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-border-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:active {
  transform: scale(0.98);
  background: var(--color-border-light);
  box-shadow: none;
}

.btn-secondary:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  box-shadow: 0 0 0 var(--spacing-xs) var(--focus-bg-highlight);
}

/* Outline Button - Subtle actions */
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--hero-text-color);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-outline:active {
  transform: scale(0.98);
  box-shadow: none;
  filter: brightness(0.9);
}

.btn-outline:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  background: var(--focus-bg-highlight);
}

/* Ghost Button - Minimal style */
.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border-color: transparent;
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.btn-ghost:active {
  background: var(--color-bg-tertiary);
  transform: scale(0.98);
}

.btn-ghost:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  background: var(--focus-bg-highlight);
}

/* Danger Button - Destructive actions */
.btn-danger {
  background: var(--color-difficulty-hard-bg);
  color: var(--color-difficulty-hard-text);
  border-color: var(--color-difficulty-hard-border);
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background: var(--color-difficulty-hard-text);
  color: var(--hero-text-color);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-danger:active {
  transform: scale(0.98);
  filter: brightness(0.9);
}

.btn-danger:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-difficulty-hard-text);
  outline-offset: var(--focus-ring-offset);
}

/* Success Button - Positive actions */
.btn-success {
  background: var(--color-difficulty-easy-bg);
  color: var(--color-difficulty-easy-text);
  border-color: var(--color-difficulty-easy-border);
  box-shadow: var(--shadow-sm);
}

.btn-success:hover {
  background: var(--color-difficulty-easy-text);
  color: var(--hero-text-color);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-success:active {
  transform: scale(0.98);
  filter: brightness(0.9);
}

.btn-success:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-difficulty-easy-text);
  outline-offset: var(--focus-ring-offset);
}

/* Button Sizes */

/* Small Button */
.btn-small,
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  gap: var(--spacing-xs);
  border-radius: var(--radius-md);
}

/* Medium Button (default) */
.btn-medium,
.btn-md {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-base);
  gap: var(--spacing-sm);
  border-radius: var(--radius-lg);
}

/* Large Button */
.btn-large,
.btn-lg {
  padding: var(--spacing-lg) var(--spacing-3xl);
  font-size: var(--font-size-lg);
  gap: var(--spacing-md);
  border-radius: var(--radius-xl);
  font-weight: var(--font-weight-semibold);
}

/* Button States */

/* Disabled State */
.btn:disabled,
.btn.disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

/* Loading State */
.btn.loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1em;
  height: 1em;
  margin: -0.5em 0 0 -0.5em;
  border: var(--spacing-2) solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  opacity: 0.8;
}

/* Active/Pressed State */
.btn:active:not(:disabled):not(.disabled) {
  transform: scale(0.98);
}

/* Button Groups */
.btn-group {
  display: inline-flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn-group .btn {
  margin: 0;
}

/* Stacked button group */
.btn-group-vertical {
  display: inline-flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* Full-width button */
.btn-block {
  display: flex;
  width: 100%;
}

/* Icon Buttons */
.btn-icon {
  padding: var(--spacing-md);
  aspect-ratio: 1;
  border-radius: 50%;
}

.btn-icon.btn-small,
.btn-icon.btn-sm {
  padding: var(--spacing-sm);
}

.btn-icon.btn-large,
.btn-icon.btn-lg {
  padding: var(--spacing-lg);
}

/* Button with icon */
.btn svg,
.btn img {
  width: 1.2em;
  height: 1.2em;
  flex-shrink: 0;
}

/* Responsive Adjustments */
@media (max-width: 600px) {
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }

  .btn-large,
  .btn-lg {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-base);
  }

  /* Make buttons full-width on mobile by default (can be overridden) */
  .btn-mobile-block {
    display: flex;
    width: 100%;
  }
}

/* Accessibility Enhancements */

/* High contrast mode */
@media (prefers-contrast: high) {
  .btn {
    border-width: var(--border-width-thick);
  }

  .btn-primary,
  .btn-secondary,
  .btn-outline {
    border-color: currentColor;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }

  .btn:hover {
    transform: none;
  }

  .btn:active {
    /* Keep scale effect even with reduced motion for tactile feedback */
    transform: scale(0.98);
  }

  .btn.loading::after {
    animation: none;
    border-top-color: currentColor;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .btn {
    /* Ensure minimum touch target size */
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
  }

  /* Remove hover effects on touch devices */
  .btn:hover {
    transform: none;
  }

  /* Enhance active state for touch feedback with consistent scale */
  .btn:active {
    transform: scale(0.98);
    opacity: 0.8;
  }
}

.error-suggestions {
  padding-top: var(--spacing-2xl, 30px);
  border-top: 1px solid var(--color-border-light, #e1e5e9);
}

.error-suggestions h2 {
  font-size: var(--font-size-xl, 1.1em);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--color-text-primary, #333);
  margin: 0 0 var(--spacing-lg, 20px);
}

.error-suggestions ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.error-suggestions li {
  margin: var(--spacing-md, 15px) 0;
  font-size: var(--font-size-base, 0.9em);
}

.error-suggestions a {
  color: var(--color-accent, #007bff);
  text-decoration: none;
  transition: color var(--transition-normal, 0.2s ease);
}

.error-suggestions a:hover {
  color: var(--color-accent-hover, #0056b3);
  text-decoration: underline;
}

.error-suggestions a:focus-visible {
  outline: 2px solid var(--color-border-focus, #007bff);
  outline-offset: 2px;
  border-radius: var(--radius-sm, 3px);
}

/* Responsive adjustments for 404 page */
@media (max-width: 600px) {
  .error-404 {
    padding: var(--spacing-2xl, 30px) var(--spacing-md, 15px);
  }

  .error-icon svg {
    width: 80px;
    height: 80px;
  }

  .error-title {
    font-size: clamp(2.5rem, 15vw, 4rem);
  }

  .error-message {
    font-size: var(--font-size-xl, 1.1em);
  }

  .btn {
    padding: var(--spacing-sm, 8px) var(--spacing-lg, 20px);
    font-size: var(--font-size-md, 0.85em);
  }
}

/* Reduced motion for 404 page */
@media (prefers-reduced-motion: reduce) {
  .error-container {
    animation: none;
  }

  .btn-primary:hover {
    transform: none;
  }
}

/* Scroll to Top Button */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  width: var(--spacing-48);
  height: var(--spacing-48);
  border-radius: 50%;
  background: var(--hero-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
  color: var(--hero-text-color, #ffffff);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.12));
  opacity: 0;
  visibility: hidden;
  transform: translateY(var(--spacing-lg));
  transition: opacity var(--transition-normal, 0.2s ease),
              visibility var(--transition-normal, 0.2s ease),
              transform var(--transition-normal, 0.2s ease),
              box-shadow var(--transition-normal, 0.2s ease);
  z-index: 999;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  box-shadow: var(--shadow-lg, 0 8px 25px rgba(0, 0, 0, 0.15));
  transform: translateY(calc(var(--spacing-2) * -1));
}

.scroll-to-top:active {
  transform: translateY(0);
}

.scroll-to-top:focus-visible {
  outline: var(--border-width-thick) solid var(--color-border-focus, #007bff);
  outline-offset: var(--spacing-2);
}

.scroll-to-top svg {
  width: var(--spacing-24);
  height: var(--spacing-24);
  display: block;
}

/* Responsive adjustments for scroll-to-top button */
@media (max-width: 1280px) {
  .scroll-to-top {
    bottom: 2rem;
    left: 2rem;
    right: auto;
    width: var(--min-touch-target);
    height: var(--min-touch-target);
  }

  .scroll-to-top svg {
    width: var(--spacing-lg);
    height: var(--spacing-lg);
  }
}

/* Reduced motion for scroll-to-top button */
@media (prefers-reduced-motion: reduce) {
  .scroll-to-top {
    transition: opacity var(--transition-normal, 0.2s ease),
                visibility var(--transition-normal, 0.2s ease);
    transform: none !important;
  }

  .scroll-to-top:hover {
    transform: none;
  }
}

/* Scroll Progress Indicator (Optional) */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: var(--spacing-3);
  background: var(--hero-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
  z-index: 9999;
  transition: width var(--transition-fast, 0.15s ease);
}

/* Reduced motion for scroll progress */
@media (prefers-reduced-motion: reduce) {
  .scroll-progress {
    display: none;
  }
}

/* ============================================
   Enhanced Link Styles
   ============================================ */

/* Base link styles with animated underline */
a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link) {
  color: var(--color-accent, #007bff);
  text-decoration: none;
  position: relative;
  display: inline;
  transition: color var(--transition-normal, 0.2s ease);
}

/* Animated underline using pseudo-element */
a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent, #007bff);
  transition: width var(--transition-normal, 0.2s ease),
              background-color var(--transition-normal, 0.2s ease);
}

/* Hover state - slide in underline */
a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):hover {
  color: var(--color-accent-hover, #0056b3);
}

a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):hover::after {
  width: 100%;
  background: var(--color-accent-hover, #0056b3);
}

/* Active state */
a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):active {
  color: var(--color-accent-active, #004085);
}

/* External link indicator */
a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"])::before,
a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::before {
  content: '';
  display: inline-block;
  width: 0.85em;
  height: 0.85em;
  margin-right: var(--spacing-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23007bff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'%3E%3C/path%3E%3Cpolyline points='15 3 21 3 21 9'%3E%3C/polyline%3E%3Cline x1='10' y1='14' x2='21' y2='3'%3E%3C/line%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  vertical-align: baseline;
  opacity: 0.7;
  transition: opacity var(--transition-normal, 0.2s ease),
              transform var(--transition-normal, 0.2s ease);
}

/* External link hover effect */
a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"]):hover::before,
a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):hover::before {
  opacity: 1;
  transform: translateX(2px) translateY(-2px);
}

/* Footer links - keep existing behavior but add animation */
.footer-links {
  margin-top: var(--spacing-md);
}

.footer-links a {
  color: var(--color-accent, #007bff);
  text-decoration: none;
  margin: 0 var(--spacing-md);
  position: relative;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  letter-spacing: var(--letter-spacing-wide);
  transition: color var(--transition-normal, 0.2s ease);
}

.footer-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent, #007bff);
  transition: width var(--transition-normal, 0.2s ease),
              background-color var(--transition-normal, 0.2s ease);
}

.footer-links a:hover {
  color: var(--color-accent-hover, #0056b3);
  text-decoration: none;
}

.footer-links a:hover::after {
  width: 100%;
  background: var(--color-accent-hover, #0056b3);
}

.footer-links a:focus-visible {
  outline: var(--border-width-thick) solid var(--color-border-focus, #007bff);
  outline-offset: var(--spacing-2);
  border-radius: var(--radius-sm);
}

/* Content area links (game pages, etc.) */
.game-content a:not(.btn),
.content a:not(.btn),
article a:not(.btn),
main a:not(.btn) {
  color: var(--color-accent, #007bff);
  text-decoration: none;
  position: relative;
  font-weight: var(--font-weight-medium, 500);
  transition: color var(--transition-normal, 0.2s ease);
}

.game-content a:not(.btn)::after,
.content a:not(.btn)::after,
article a:not(.btn)::after,
main a:not(.btn)::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent, #007bff);
  transition: width var(--transition-normal, 0.2s ease),
              background-color var(--transition-normal, 0.2s ease);
}

.game-content a:not(.btn):hover,
.content a:not(.btn):hover,
article a:not(.btn):hover,
main a:not(.btn):hover {
  color: var(--color-accent-hover, #0056b3);
}

.game-content a:not(.btn):hover::after,
.content a:not(.btn):hover::after,
article a:not(.btn):hover::after,
main a:not(.btn):hover::after {
  width: 100%;
  background: var(--color-accent-hover, #0056b3);
}

/* Navigation links - preserve existing styles */
nav a,
.nav-link,
.site-header a {
  /* These already have their own styles, don't override */
}

/* Visited link state */
a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):visited {
  color: var(--color-accent-visited, #6610f2);
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
  a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"])::before,
  a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2380b3ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'%3E%3C/path%3E%3Cpolyline points='15 3 21 3 21 9'%3E%3C/polyline%3E%3Cline x1='10' y1='14' x2='21' y2='3'%3E%3C/line%3E%3C/svg%3E");
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::after {
    height: 3px;
  }

  a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"])::before,
  a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::before {
    opacity: 1;
  }
}

/* Reduced motion - disable animations */
@media (prefers-reduced-motion: reduce) {
  a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::after {
    transition: none;
  }

  a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):hover::after {
    width: 100%;
  }

  a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"])::before,
  a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::before {
    transition: none;
  }

  a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"]):hover::before,
  a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):hover::before {
    transform: none;
  }
}

/* Print styles - remove underlines and external indicators */
@media print {
  a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::after {
    display: none;
  }

  a[href^="http"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link):not([href*="joventuts-magiques.github.io"])::before,
  a[target="_blank"]:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link)::before {
    display: none;
  }

  a:not(.btn):not(.skip-link):not(.game-card):not(.language-link):not(.lang-link) {
    color: var(--color-text-primary, #333);
    text-decoration: underline;
  }
}