/* Modern CSS with Variables and Advanced Features */
:root {
  /* Color System */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  
  /* Colors */
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --secondary: #48bb78;
  --secondary-dark: #38a169;
  --accent: #ed8936;
  --accent-dark: #dd6b20;
  --error: #e53e3e;
  
  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* 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;
  
  /* Typography */
  --font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-base: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Container */
  --container-max-width: 90rem;
  --container-padding: var(--space-md);
}

/* Dark mode variables */
[data-theme="dark"] {
  /* Background gradients for dark mode */
  --primary-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --secondary-gradient: linear-gradient(135deg, #2d1b69 0%, #1e3c72 100%);
  --success-gradient: linear-gradient(135deg, #134e4a 0%, #0f766e 100%);
  --warning-gradient: linear-gradient(135deg, #b45309 0%, #dc2626 100%);
  
  /* Primary colors - brighter for visibility */
  --primary: #8b5cf6;
  --primary-dark: #7c3aed;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --error: #ef4444;
  
  /* Dark mode gray scale */
  --gray-50: #0f172a;
  --gray-100: #1e293b;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748b;
  --gray-500: #94a3b8;
  --gray-600: #cbd5e1;
  --gray-700: #e2e8f0;
  --gray-800: #f1f5f9;
  --gray-900: #f8fafc;
}

/* Dark mode container styles */
[data-theme="dark"] .container {
  background: var(--gray-100);
  color: var(--gray-900);
}

[data-theme="dark"] .format-category {
  background: var(--gray-200);
  border-color: var(--gray-300);
}

[data-theme="dark"] .category-title {
  color: var(--primary);
}

[data-theme="dark"] .format-section {
  background: var(--gray-100);
  border-color: var(--gray-300);
}

[data-theme="dark"] .format-title {
  color: var(--gray-900);
}

[data-theme="dark"] .format-info {
  background: var(--gray-50);
  color: var(--gray-800);
}

[data-theme="dark"] .coordinate-display {
  background: var(--gray-50);
  color: var(--gray-900);
  border-color: var(--gray-300);
}

[data-theme="dark"] .app-title {
  color: var(--gray-900);
}

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

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--primary-gradient);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  
  /* iOS Safari optimizations */
  -webkit-overflow-scrolling: touch;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  
  /* Safe area handling for iPhone X and newer */
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
}

/* Layout */
.app {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  gap: var(--space-md);
  padding: var(--space-md);
}

.hero-section {
  text-align: center;
  color: white;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.6s ease-out;
}

.brand-title {
  font-size: clamp(var(--text-2xl), 5vw, var(--text-4xl));
  font-weight: 800;
  margin-bottom: var(--space-sm);
  background: linear-gradient(45deg, #fff, #e2e8f0);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
}

.brand-subtitle {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xl);
  opacity: 0.9;
  font-weight: 300;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.feature-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  color: white;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
  display: block;
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-description {
  font-size: var(--text-sm);
  opacity: 0.9;
}

/* Main Container */
.container {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  max-width: min(95vw, 900px);
  width: 100%;
  box-shadow: var(--shadow-2xl);
  margin: 0 auto;
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  animation: slideInUp 0.6s ease-out 0.2s both;
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: all var(--transition-base);
  z-index: 1000;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* Typography */
.app-title {
  text-align: center;
  color: var(--gray-800);
  margin-bottom: var(--space-2xl);
  font-size: var(--text-3xl);
  font-weight: 700;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title {
  color: var(--gray-700);
  margin-bottom: var(--space-lg);
  font-size: var(--text-xl);
  font-weight: 600;
}

.subsection-title {
  color: var(--gray-600);
  margin-bottom: var(--space-sm);
  font-size: var(--text-lg);
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 500;
  transition: all var(--transition-base);
  text-decoration: none;
  font-size: var(--text-base);
  min-height: 44px;
  position: relative;
  overflow: hidden;
  
  /* iOS Safari touch optimizations */
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--text-lg);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
  display: block;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--success-gradient);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-large {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--text-lg);
  font-weight: 600;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
}

.btn-extra-large {
  padding: var(--space-xl) var(--space-3xl);
  font-size: var(--text-xl);
  font-weight: 700;
  width: 100%;
  max-width: 500px;
  margin: var(--space-xl) auto;
  white-space: nowrap;
}

.btn-copy {
  background: var(--warning-gradient);
  color: white;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-sm);
}

.btn-copy:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

/* Format Sections */
.format-grid {
  display: grid;
  gap: var(--space-xl);
}

.format-category {
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid var(--gray-200);
  animation: fadeIn 0.5s ease-out;
}

.category-title {
  color: var(--primary);
  margin-bottom: var(--space-lg);
  font-size: var(--text-xl);
  font-weight: 700;
  border-bottom: 2px solid var(--primary);
  padding-bottom: var(--space-sm);
}

.format-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--primary);
  transition: all var(--transition-base);
  animation: fadeIn 0.5s ease-out;
}

.format-section:last-child {
  margin-bottom: 0;
}

.format-section:hover {
  border-left-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.format-title {
  color: var(--gray-800);
  margin-bottom: var(--space-sm);
  font-size: var(--text-lg);
  font-weight: 600;
}

.format-info {
  color: var(--gray-600);
  font-size: var(--text-sm);
  line-height: 1.4;
  margin-bottom: var(--space-md);
  padding: var(--space-sm);
  background: var(--gray-50);
  border-radius: var(--radius-base);
  border-left: 3px solid var(--secondary);
}

.coordinate-display {
  background: white;
  padding: var(--space-md);
  border-radius: var(--radius-base);
  border: 1px solid var(--gray-300);
  margin-bottom: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  word-break: break-all;
  position: relative;
}

.coordinate-display a {
  color: var(--primary);
  text-decoration: none;
}

.coordinate-display a:hover {
  text-decoration: underline;
}

/* Map Styles */
.map-container {
  height: 400px;
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-300);
  margin-bottom: var(--space-md);
  background: var(--gray-100);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  
  /* iOS Safari map optimizations */
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x pan-y;
}

#map {
  height: 400px;
  width: 100%;
  border-radius: var(--radius-lg);
  background: var(--gray-100);
  border: none;
}

.leaflet-container {
  height: 400px !important;
  width: 100% !important;
  border-radius: var(--radius-lg);
}

.map-controls {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.map-placeholder {
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-style: italic;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  text-align: center;
  padding: var(--space-lg);
  border: 1px solid var(--gray-300);
}

/* Fullscreen Map Styles */
.map-fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  z-index: 99999 !important;
  border-radius: 0 !important;
  border: none !important;
  margin: 0 !important;
  padding: 0 !important;
  box-shadow: none !important;
  transform: none !important;
  
  /* Android Chrome fullscreen fix */
  min-height: 100vh !important;
  min-width: 100vw !important;
}

.map-fullscreen .leaflet-container {
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  height: 100vh !important;
  width: 100vw !important;
  max-height: 100vh !important;
  max-width: 100vw !important;
  border-radius: 0 !important;
}

/* Android specific fullscreen fixes */
@media screen and (max-width: 768px) {
  .map-fullscreen {
    /* Use CSS environment variables for mobile browsers */
    height: calc(var(--vh, 1vh) * 100) !important;
    min-height: calc(var(--vh, 1vh) * 100) !important;
  }
  
  .map-fullscreen .leaflet-container {
    height: calc(var(--vh, 1vh) * 100) !important;
    min-height: calc(var(--vh, 1vh) * 100) !important;
  }
}

/* Fullscreen exit button */
.fullscreen-exit-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-family);
  z-index: 100000;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all var(--transition-base);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.fullscreen-exit-btn:hover {
  background: rgba(0, 0, 0, 0.9);
  border-color: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.fullscreen-exit-btn:active {
  transform: scale(0.95);
  background: rgba(0, 0, 0, 1);
}

@media (max-width: 768px) {
  .map-placeholder {
    height: 350px;
  }
  
  .fullscreen-exit-btn {
    top: 10px;
    right: 10px;
    font-size: 12px;
    padding: 10px 14px;
  }
}

/* Share Section */
.share-section {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--gray-200);
  margin-top: var(--space-lg);
}

/* Error Handling */
.error {
  background: linear-gradient(135deg, #fed7d7, #feb2b2);
  color: var(--error);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--error);
  margin-top: var(--space-md);
  animation: shake 0.5s ease-out;
}

.hidden {
  display: none;
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Responsive Design */
@media (max-width: 768px) {
  .app {
    padding: var(--space-sm);
    gap: var(--space-sm);
  }
  
  .container {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
  }
  
  .format-grid {
    gap: var(--space-md);
  }
  
  .format-section {
    padding: var(--space-md);
  }
  
  .map-container {
    height: 350px;
  }
  
  #map,
  .leaflet-container {
    height: 350px !important;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    margin-bottom: var(--space-lg);
  }
  
  .theme-toggle {
    top: var(--space-md);
    right: var(--space-md);
    width: 40px;
    height: 40px;
  }
  
  .btn-primary {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
  }
  
  .coordinate-display {
    font-size: var(--text-xs);
    padding: var(--space-sm);
  }
  
  .fullscreen-exit-btn {
    top: 10px;
    right: 10px;
    font-size: 12px;
    padding: 10px 14px;
  }
}

/* iOS specific optimizations */
@supports (-webkit-touch-callout: none) {
  .btn {
    /* iOS button touch area enhancement */
    min-height: 48px;
  }
  
  .theme-toggle {
    min-height: 48px;
    min-width: 48px;
  }
  
  .fullscreen-exit-btn {
    min-height: 48px;
    padding: 12px 18px;
  }
  
  /* iOS Safari viewport height fix */
  body {
    min-height: -webkit-fill-available;
  }
  
  .app {
    min-height: -webkit-fill-available;
  }
}

/* iPhone specific styles */
@media screen and (max-width: 430px) {
  .map-controls {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xs);
  }
  
  .btn-copy {
    font-size: var(--text-xs);
    padding: var(--space-xs) var(--space-sm);
  }
  
  .coordinate-display {
    font-size: 11px;
    line-height: 1.3;
  }
}

@media (max-width: 480px) {
  .map-controls {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-copy {
    width: 100%;
    max-width: 200px;
  }
  
  .feature-card {
    padding: var(--space-md);
  }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .container {
    border-width: 0.5px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Styles */
.btn:focus-visible,
.coordinate-display:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .app {
    background: white;
    color: black;
  }
  
  .hero-section,
  .theme-toggle,
  .btn {
    display: none;
  }
  
  .container {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}