/* ==========================================================================
   Brücken Bauen - Main Stylesheet
   Interactive Democracy Game for Menschlichkeit Österreich
   ========================================================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
  /* Colors - Menschlichkeit Österreich Brand */
  --primary-color: #b80000;
  --primary-light: #d42c2c;
  --primary-dark: #800000;
  --secondary-color: #f5f5f0;
  --accent-color: #ffd700;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  --black: #000000;
  
  /* Semantic Colors */
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #17a2b8;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-secondary: Georgia, 'Times New Roman', serif;
  
  /* Font Sizes (Responsive) */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-3xl: clamp(2rem, 1.7rem + 1.5vw, 3rem);
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-blur: blur(20px);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--gray-800);
  background: linear-gradient(135deg, 
    var(--secondary-color) 0%, 
    rgba(245, 245, 240, 0.8) 50%, 
    rgba(184, 0, 0, 0.05) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--gray-900);
  margin-bottom: var(--space-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-medium);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Layout */
.container {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-xl);
  }
}

/* Header */
.game-header {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.logo-icon {
  flex-shrink: 0;
}

.game-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  margin: 0;
}

.progress-section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.progress-bar {
  width: 120px;
  height: 8px;
  background: var(--gray-300);
  border-radius: var(--border-radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  border-radius: var(--border-radius-full);
  transition: width var(--transition-normal);
  width: 0%;
}

.progress-text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--gray-700);
  white-space: nowrap;
}

/* Main Content */
.game-main {
  padding: var(--space-xl) 0 var(--space-3xl);
  min-height: calc(100vh - 120px);
}

/* Screen Management */
.screen {
  display: none;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.screen.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Glass Card Component */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
  margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
  .glass-card {
    padding: var(--space-lg);
    border-radius: var(--border-radius-lg);
  }
}

/* Welcome Card */
.welcome-card {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.screen-title {
  color: var(--primary-color);
  margin-bottom: var(--space-lg);
}

.screen-subtitle {
  font-size: var(--font-size-lg);
  color: var(--gray-600);
  margin-bottom: var(--space-2xl);
  line-height: var(--line-height-relaxed);
}

/* Game Info */
.game-info {
  display: grid;
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
  text-align: left;
}

@media (min-width: 640px) {
  .game-info {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.info-icon {
  color: var(--primary-color);
  flex-shrink: 0;
}

/* Learning Goals */
.learning-goals {
  text-align: left;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xl);
  border-radius: var(--border-radius-lg);
  margin: var(--space-2xl) 0;
}

.learning-goals h3 {
  color: var(--primary-color);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-lg);
}

.learning-goals ul {
  list-style: none;
  padding: 0;
}

.learning-goals li {
  position: relative;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-relaxed);
}

.learning-goals li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--success-color);
  font-weight: var(--font-weight-bold);
}

/* Buttons */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 48px;
  min-width: 48px;
}

.cta-button:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.primary-button {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.primary-button:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.primary-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.secondary-button {
  background: var(--white);
  color: var(--primary-color);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.secondary-button:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.cta-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: var(--shadow-sm) !important;
}

.button-icon {
  flex-shrink: 0;
}

/* Footer */
.game-footer {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-xl) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

@media (max-width: 640px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

.footer-info {
  flex-grow: 1;
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  margin-bottom: var(--space-xs);
}

.footer-mission {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  font-style: italic;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .footer-links {
    justify-content: center;
  }
}

.footer-link {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:focus {
  color: var(--primary-color);
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loading-screen.active {
  opacity: 1;
  visibility: visible;
}

.loading-content {
  text-align: center;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--gray-300);
  border-top: 4px solid var(--primary-color);
  border-radius: var(--border-radius-full);
  margin: 0 auto var(--space-lg);
  animation: spin 1s linear infinite;
}

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

.loading-text {
  font-size: var(--font-size-base);
  color: var(--gray-700);
  margin: 0;
}

/* Responsive Design */
@media (max-width: 480px) {
  :root {
    --space-md: 0.75rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .game-main {
    padding: var(--space-lg) 0 var(--space-2xl);
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.3);
  }
  
  .glass-card {
    border-width: 2px;
  }
  
  .cta-button {
    border-width: 3px;
  }
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
  /* Dark mode styles can be added here */
}

/* Print Styles */
@media print {
  .game-header,
  .game-footer,
  .loading-screen {
    display: none;
  }
  
  .glass-card {
    background: var(--white);
    border: 1px solid var(--gray-300);
    box-shadow: none;
  }
}