/* CSS Custom Properties for consistent theming */
:root {
  /* Colors - inspired by Apple's design system */
  --primary-blue: #007AFF;
  --primary-blue-hover: #0056CC;
  --primary-blue-light: rgba(0, 122, 255, 0.1);
  --text-primary: #1D1D1F;
  --text-secondary: #86868B;
  --text-tertiary: #C7C7CC;
  --background-primary: #FFFFFF;
  --background-secondary: #F5F5F7;
  --background-tertiary: #FAFAFA;
  --border-light: #E5E5EA;
  --border-medium: #D1D1D6;
  --success: #30D158;
  --warning: #FF9F0A;
  --error: #FF3B30;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-4xl: 40px;
  
  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 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);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 250ms ease-out;
  --transition-slow: 350ms ease-out;
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Focus styles for accessibility */
*:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

*:focus:not(:focus-visible) {
  outline: none;
}

/* App container */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  text-align: center;
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.logo-icon {
  font-size: var(--font-size-3xl);
  animation: gentle-bounce 2s ease-in-out infinite;
}

.logo-text {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary-blue) 0%, #5856D6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 300px;
  margin: 0 auto;
}

/* Main content */
.main-content {
  flex: 1;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

/* Input section */
.input-section {
  margin-bottom: var(--spacing-3xl);
}

.city-input-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.city-label {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.city-input {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-md);
  font-size: var(--font-size-lg);
  font-weight: 400;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  background-color: var(--background-primary);
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.city-input::placeholder {
  color: var(--text-tertiary);
}

.city-input:hover {
  border-color: var(--border-medium);
}

.city-input:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px var(--primary-blue-light);
}

.input-help {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

/* Interests section */
.interests-section {
  margin-bottom: var(--spacing-3xl);
}

.interests-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

.interests-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.interest-pill {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-xl);
  background-color: var(--background-primary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  user-select: none;
  min-height: 48px;
}

.interest-pill:hover {
  border-color: var(--primary-blue);
  background-color: var(--primary-blue-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.interest-pill[aria-pressed="true"] {
  border-color: var(--primary-blue);
  background-color: var(--primary-blue);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.interest-pill:active {
  transform: translateY(0);
}

.interest-emoji {
  font-size: var(--font-size-lg);
  line-height: 1;
}

.interest-text {
  white-space: nowrap;
}

/* Action section */
.action-section {
  margin-bottom: var(--spacing-3xl);
  text-align: center;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--primary-blue) 0%, #5856D6 100%);
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  min-height: 56px;
}

.cta-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--primary-blue-hover) 0%, #4A47A3 100%);
}

.cta-button:active:not(:disabled) {
  transform: translateY(0);
}

.cta-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.cta-icon {
  font-size: var(--font-size-lg);
  animation: gentle-pulse 2s ease-in-out infinite;
}

/* Result section */
.result-section {
  margin-bottom: var(--spacing-3xl);
  animation: slide-up var(--transition-slow) ease-out;
}

.result-container {
  background-color: var(--background-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

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

.result-city {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
}

.result-status {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-status.found {
  background-color: var(--success);
  color: white;
}

.result-status.not-found {
  background-color: var(--warning);
  color: white;
}

.result-content {
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.result-content h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.result-content p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.result-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.highlight-item {
  background-color: var(--background-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary-blue);
}

.highlight-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.highlight-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.try-again-btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--primary-blue);
  background-color: transparent;
  border: 2px solid var(--primary-blue);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.try-again-btn:hover {
  background-color: var(--primary-blue);
  color: white;
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.loading-spinner {
  text-align: center;
  color: white;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

.loading-text {
  font-size: var(--font-size-lg);
  font-weight: 500;
}

/* Animations */
@keyframes gentle-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

@keyframes gentle-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

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

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive design */
@media (max-width: 768px) {
  :root {
    --font-size-3xl: 28px;
    --font-size-2xl: 20px;
    --font-size-xl: 18px;
    --spacing-2xl: 32px;
    --spacing-3xl: 48px;
  }
  
  .app-container {
    padding: 0 var(--spacing-md);
  }
  
  .header {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
  }
  
  .logo {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .interests-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
  }
  
  .interest-pill {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    min-height: 44px;
  }
  
  .result-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .result-highlights {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .app-container {
    padding: 0 var(--spacing-sm);
  }
  
  .city-input {
    font-size: var(--font-size-base);
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .cta-button {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .interests-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-light: #000000;
    --border-medium: #000000;
    --text-secondary: #000000;
  }
}

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

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #F5F5F7;
    --text-secondary: #A1A1A6;
    --text-tertiary: #6D6D70;
    --background-primary: #000000;
    --background-secondary: #1C1C1E;
    --background-tertiary: #2C2C2E;
    --border-light: #38383A;
    --border-medium: #48484A;
  }
  
  .city-input::placeholder {
    color: var(--text-tertiary);
  }
}